JP4052451B2 - Recycled fuel assembly storage basket and recycled fuel assembly storage container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a basket for storing a recycle fuel assembly, and more particularly to a recycle fuel assembly storage basket and a recycle fuel assembly storage container that are easy to manufacture.
[0002]
[Prior art]
A nuclear fuel assembly that has finished predetermined combustion at the end of the nuclear fuel cycle is called a recycled fuel assembly. Since the recycled fuel assembly contains a highly radioactive substance such as FP, it needs to be thermally cooled. For this reason, it cools for a predetermined period (3 to 6 months) in the cooling pit of a nuclear power plant. Then, it is stored in a cask that is a shielding container, and is transported and stored in a reprocessing facility or the like by a vehicle or a ship. Alternatively, the recycled fuel assembly is stored in a container made of a relatively thin steel plate called a canister, and then the canister is sealed in a transport cask and transported to a storage facility. In the storage facility, the recycled fuel assembly is stored together with the canister in a concrete cask or an underground storage.
[0003]
When the recycled fuel assembly is accommodated in the cask, a holding frame having a lattice-like cross section called a basket is used. Recycled fuel assemblies are inserted one by one into cells that are a plurality of storage spaces formed in the basket. This ensures an appropriate holding force against vibration during transportation. As conventional examples of such cask and canister, various types are disclosed in Patent Document 1 and Non-Patent Document 1, so please refer to them if necessary.
[0004]
As an example of the basket, in Patent Document 2, a plurality of notch portions that are engaged with each other at right angles to both long side end surfaces of the plate-like member are provided, and a convex portion is provided in the longitudinal direction of the center portion of both short side end surfaces. In addition, the plate-like members are sequentially orthogonal to each other to engage and combine the notches, and a heat transfer plate is externally fitted between the adjacent convex portions to form a lattice cell that houses the nuclear fuel assembly. A basket is disclosed.
[0005]
[Patent Document 1]
JP-A-1-86098
[Patent Document 2]
Japanese Patent Laid-Open No. 2001-201595 FIG.
[Non-Patent Document 1]
Nuclear energy eye issued on April 1, 1998, Nikkan Kogyo Publishing Production p32-p39
[0006]
[Problems to be solved by the invention]
By the way, in the basket disclosed in Patent Document 2, it is necessary to externally fit and weld a heat transfer plate between adjacent convex portions, and assembling the basket requires labor and labor. For this reason, the basket disclosed in Patent Document 2 does not improve the productivity, resulting in an increase in manufacturing cost. In addition, since the heat transfer plate is attached by welding, it is difficult to disassemble the basket once assembled, and it is difficult to reuse the plate-like member, the heat transfer plate, or the like that is a basket component. Therefore, the present invention has been made in view of the above, and is a recycled fuel that can achieve at least one of being able to be efficiently manufactured by reducing labor and labor of manufacturing, and being easily decomposed and suitable for reuse. It is an object to provide an assembly storage basket and a recycled fuel assembly storage container.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, the basket for storing a recycled fuel assembly according to the present invention has a through-hole penetrating in the longitudinal direction at both short side end portions and a plurality of long side end portions. A plate-like member in which a cut portion is formed, and a heat transfer plate having a substantially U-shaped cross section having claws detachably inserted into the opening of the through-hole on both sides, the length of the plate-like member A plurality of cells for storing the recycle fuel assemblies are formed by stacking the plate-like members in a plurality of stages by making the side end portions orthogonal to each other and engaging the notches, and The claw on both sides of the heat transfer plate is inserted into the opening of the plate member adjacent to the direction orthogonal to the stacking direction, and the heat transfer plate is attached to the short side end of the plate member. Features.
[0008]
This recycled fuel assembly storage basket is configured by stacking a plurality of stages of plate-like members alternately perpendicular to each other and attaching a heat transfer plate to the outer periphery thereof in a detachable manner. For this reason, since it is not necessary to weld a heat exchanger plate to a plate-shaped member, a basket can be assembled easily. Thereby, the effort and labor at the time of manufacturing a basket are reduced, and it can manufacture efficiently. Further, since the heat transfer plate is detachably attached by inserting the claws provided on the heat transfer plate into the through holes provided in the plate-like member, the disassembly is extremely easy and suitable for the reuse of the basket components.
[0009]
In the recycled fuel assembly storage basket according to the next invention, a through-hole penetrating in the longitudinal direction opens at both short-side end portions, and a plurality of cut portions are formed at the long-side end portions. A plate-shaped member, and a heat transfer plate having a substantially U-shaped cross-section, which is detachably inserted into the opening of the through-hole and has claws formed with notches at least in part on both sides, A plurality of cells for storing the recycle fuel assemblies are formed by stacking the plate-like members in a plurality of stages by causing the long-side ends of the plate-like members to be orthogonal to each other and engaging the notches. The claw of the heat transfer plate is inserted into the opening of the plate member so that the notch of the claw straddles the plate member adjacent in the stacking direction of the plate member, and the heat transfer plate is It is attached to the end of the short side of the plate-like member. .
[0010]
In this recycled fuel assembly storage basket, the plate-like members are alternately stacked in a plurality of stages so that the plate-like members are orthogonal to each other, and the heat transfer plate claws are arranged so as to straddle the plate members adjacent in the stacking direction of the plate-like members. The heat transfer plate is removably attached by being inserted into the opening of the through hole of the member. As a result, the plate members can be integrated with the heat transfer plate in the stacking direction of the plate members, so that they can be handled easily after the basket is assembled, and when the basket is inserted into the cavity of the cask. Can also work easily. Further, since the heat transfer plate is detachably attached to the plate-like member, welding is unnecessary. This allows the basket to be assembled easily. Furthermore, since the heat transfer plate is detachably attached, disassembly is extremely easy, which is preferable for reusing the basket components.
[0011]
Further, in the basket for storing a recycled fuel assembly according to the next invention, a plurality of through holes penetrating in the longitudinal direction are opened at both short side end portions, and a portion partitioned by the plurality of through holes has ribs. A claw formed with a plate-like member formed with a plurality of cuts at the end on the long side, and a nail that is detachably inserted into the opening of the through-hole and at least partially cut out A plurality of the plate-like members by making the long-side ends of the plate-like members orthogonal to each other and engaging the notches. A plurality of cells that store the recycled fuel assemblies are formed by stacking, and the claw is inserted into the opening of the plate-like member so that the rib and the claw notch are combined, and the heat transfer A plate is attached to the short side end of the plate member It is characterized in.
[0012]
This recycled fuel assembly storage basket is formed by alternately stacking a plurality of stages of plate-like members orthogonal to each other, and further, notches formed in ribs provided in the plate-like members and claws of the heat transfer plate. A heat transfer plate is detachably attached to each stage. Thereby, since each stage of a basket can be assembled separately, the assembly of each stage can be advanced simultaneously and the productivity of a basket can be improved. Further, since the heat transfer plate is attached to the plate-like member, no basket is required, so that the basket can be manufactured efficiently. Furthermore, since the heat transfer plate can be attached and detached, the basket can be easily disassembled, which is a preferable structure for reusing the basket components.
[0013]
The recycled fuel assembly storage basket according to the next invention is the above-mentioned recycled fuel assembly storage basket, and is further provided with a convex portion and a concave portion at both long side end portions of the plate member. The plate-like member is stacked by combining the convex portion and the concave portion.
[0014]
As described above, if the projections and the recesses are provided at both ends of the long side of the plate-like member and the projections and the recesses are combined to stack the plate-like members, the plate-like members are combined. The basket can be assembled with high accuracy by preventing time shift. Further, when the basket is assembled, the plate-like member can be positioned simply by combining the convex portion and the concave portion, so that the basket can be easily assembled, and the labor for manufacturing can be reduced. Further, if the width of the convex portion and the concave portion is increased with respect to the thickness of the plate-like member, even when a boron-aluminum alloy (hereinafter referred to as B-Al alloy), which is a difficult-to-extrusion material, is extruded, This is preferable because the life can be extended.
[0015]
In the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, the plate member is provided with a communication hole that penetrates the plate member in the short side direction. The plate-like members stacked in a plurality of stages are connected by passing through the connecting member through the communication hole.
[0016]
Thus, since the said plate-shaped member piled up in multiple steps is connected by a connection member, the whole basket can be handled as integral. In particular, when the heat transfer plate is attached to each stage of the basket as in the above-described invention, the basket can be handled as a whole by this structure, so that it can be handled easily after the basket is assembled. And it can work easily also when inserting a basket into the cavity of a cask.
[0017]
In the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, the claw inserted into the through hole is pressed by a fixing unit that presses the inner wall side of the through hole. The heat transfer plate is fixed to the plate member. Thus, since the heat transfer plate is fixed to the plate member by pressing the claw of the heat transfer plate inserted into the through hole of the plate member against the inner wall of the through hole, the plate member can be prevented from falling off. Further, since the plate-like member and the heat transfer plate are integrated by the fixing means, the basket has a stronger structure and the heat transfer performance is improved.
[0018]
In addition, like the basket for storing a recycled fuel assembly according to the next invention, a wedge-shaped member whose cross-sectional area decreases toward the opening of the through hole is used as the fixing means, and the heat transfer plate is replaced with the plate. When fixing to the shaped member, the wedge-shaped member may be moved to the opening side of the through hole to press the claw against the inner wall surface side of the through hole. Thus, the use of the wedge-shaped member is preferable because the heat transfer plate can be firmly fixed to the plate member with a simple structure and can be easily removed.
[0019]
  In addition, as in the basket for storing recycled fuel assemblies according to the next invention,ofThe portion in contact with the wedge-shaped member is separated by two slits, and when the heat transfer plate is fixed to the plate-shaped member, the portion separated by the slit is in contact with the inner wall surface of the through hole. You may do it. In this way, the claw can be easily pressed against the inner wall of the through hole, so that the pressing force generated between the claw and the inner wall of the through hole can be generated more effectively, and the heat transfer plate can be more reliably fixed. It can be fixed to the shaped member.
[0020]
  The recycled fuel assembly storage basket according to the next invention is the above-mentioned recycled fuel assembly storage basket, whereinofA taper is provided at a portion where the wedge-shaped member contacts. In this way, since a larger wedge-shaped member can be used, the heat transfer plate can be more securely fixed to the plate-shaped member by pressing the claws against the inner wall of the through hole with a larger area.
[0021]
In the recycled fuel assembly storage basket according to the next invention, when the heat transfer plate is attached to the plate member in the recycled fuel assembly storage basket, the inside of the claw is provided on the plate member. The heat transfer plate is fixed to the plate member by the elastic force of the claw in contact with the inner wall of the formed through hole. In this way, the heat transfer plate is fixed to the plate-like member by the elastic force of the claws provided on the heat transfer plate, so that the heat transfer plate can be fixed simply by inserting the claws of the heat transfer plate into the through holes of the plate-like member. . Thereby, the basket can be assembled more easily. Further, since it is not necessary to use a special member for fixing the heat transfer plate, the cost can be reduced accordingly.
[0022]
Further, in the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, the claw has a convex portion protruding toward the inside of the claw, and the heat transfer plate is connected to the basket. When attached to the plate-like member, the convex portion comes into contact with an inner wall of a through hole provided in the plate-like member, and the heat transfer plate is fixed to the plate-like member by the elastic force of the claw. .
[0023]
In this recycled fuel assembly storing basket, the heat transfer plate is fixed to the plate-like member by pressing the convex portion provided on the claw against the inner wall of the through hole by the elastic force of the claw provided on the heat transfer plate. For this reason, since a heat exchanger plate can be fixed only by inserting the nail | claw of a heat exchanger plate in the through-hole of a plate-shaped member, a basket can be assembled easily. Moreover, since a convex part contacts the inner wall of a through-hole, a heat exchanger plate can be fixed more reliably. Furthermore, since it is not necessary to use a special member for fixing the heat transfer plate, the manufacturing cost of the basket can be reduced accordingly.
[0024]
Further, as in the recycled fuel assembly storage basket according to the next invention, a recess is formed in the inner wall of the through hole with which the protrusion abuts, and the heat transfer plate is used as the plate member. When attached, the concave portion and the convex portion may engage with each other. In this way, the protrusion provided on the claw of the heat transfer plate engages with the recess formed on the inner wall of the through hole and the heat transfer plate is difficult to come off, so that the heat transfer plate can be more reliably prevented from falling off. preferable.
[0025]
In the recycled fuel assembly storage basket according to the next invention, a through-hole penetrating in the longitudinal direction opens at both short-side end portions, and a plurality of cuts are formed at either long-side end portion. The first plate-like member in which the notch is formed and the through hole open at both ends, and the length in the direction through which the through hole passes is substantially the same as the inner side of the cell containing the recycled fuel assembly. The second plate-shaped member and the first plate-shaped member are formed by making the long-side ends of the first plate-shaped member orthogonal to each other and engaging the notch with one of the long-side ends. A plurality of cells are stacked, and the second plate member is disposed between the first plate members adjacent to each other in the stacking direction of the first plate member to form a plurality of cells for storing the recycled fuel assemblies. It is characterized by that.
[0026]
The basket for storing the recycle fuel assembly is configured by combining the first plate-like members so as to be orthogonal to each other, and arranging the second plate-like member having a size smaller than that of the first plate-like member between the first plate-like members. It is. For this reason, the 1st plate-shaped member should just form a notch in the edge part of any one long side, and the magnitude | size of a notch should just be a grade which prevents the shift | offset | difference of a 1st plate-shaped member. As a result, the notch can be easily processed, and the waste of material can be greatly reduced. Further, since the second plate-like member can be manufactured simply by cutting, it can be manufactured very easily. Thereby, the man-hour required for the process of the element which comprises a basket can be reduced. Furthermore, since the basket can be configured by stacking the first plate member and the second plate member side by side, the basket can be easily manufactured.
[0027]
Further, like the recycled fuel assembly storage basket according to the next invention, the first plate member is further provided with a communication hole penetrating the first plate member in the short side direction. The first plate-like members stacked in a plurality of stages may be connected by penetrating the connecting member through the communication hole. In this way, since the first plate-like members stacked in a plurality of stages are connected to each other, the entire basket can be handled as an integral body, and a strong basket can be configured. Accordingly, the basket can be handled as an integral unit without being integrated with the heat transfer plate, and can be easily operated even when the basket is inserted into the cavity of the cask. If a heat transfer plate is further attached to the outer periphery of the basket, a stronger basket can be obtained.
[0028]
Further, the recycled fuel assembly storage basket according to the next invention is the above-mentioned recycled fuel assembly storage basket, and further has a substantially U-shaped cross section having claws that are detachably inserted into the openings of the through holes on both sides. Claw on both sides of the heat transfer plate at the opening of the first plate member or the second plate member adjacent to the direction perpendicular to the stacking direction of the first plate member. And the heat transfer plate is attached to the first plate member or the second plate member.
[0029]
This recycled fuel assembly storage basket is common to the recycled fuel assembly storage basket in that it is configured by combining a first plate member and a second plate member. Therefore, the same operation and effect as the recycled fuel assembly storage basket can be obtained. Further, the recycled fuel assembly storage basket has a heat transfer plate detachably attached to its outer periphery. For this reason, since it is not necessary to weld a heat exchanger plate to a plate-shaped member, a basket can be assembled easily. Thereby, the effort and labor at the time of manufacturing a basket are reduced, and it can manufacture efficiently. In addition, since the heat transfer plate is detachably attached by inserting the claws provided on the heat transfer plate into the through holes provided in the first or second plate-like member, it is extremely easy to disassemble and reuse the basket components Suitable for. Furthermore, since each step of the basket can be assembled separately, the assembly of each step can be advanced simultaneously to improve the productivity of the basket. In addition, it is preferable to arrange | position a 2nd plate upper member so that the penetration direction of the through-hole of a 2nd plate-shaped member may become parallel to the longitudinal direction of said 1st plate-shaped member.
[0030]
Further, the recycled fuel assembly storage basket according to the next invention is further detachably inserted into the opening of the through hole in the recycled fuel assembly storage basket, and a notch is formed at least in part. A heat transfer plate having a substantially U-shaped cross-section having the claws on both sides, and the first plate member and the second plate adjacent to each other in the stacking direction of the first plate member and the second plate member. The claw of the heat transfer plate is inserted into the opening so that the notch of the claw straddles the plate member, and the heat transfer plate is attached to the first plate member and the second plate member. It is characterized by that.
[0031]
This recycled fuel assembly storage basket is common to the recycled fuel assembly storage basket in that it is configured by combining a first plate member and a second plate member. Therefore, the same operation and effect as the recycled fuel assembly storage basket can be obtained. Furthermore, this recycled fuel assembly storage basket has plate-like claws of the heat transfer plate so as to straddle the first plate-like member and the second plate-like member adjacent in the stacking direction of the first and second plate-like members. The heat transfer plate is removably attached by being inserted into the opening of the through hole of the member. Thereby, since the first and second plate-like members can be firmly fixed by the heat transfer plate, it can be handled easily after the basket is assembled. As a result, the basket can be easily inserted into the cask cavity. Further, since the heat transfer plate is detachably attached to the plate-like member, welding is unnecessary, and the basket can be easily assembled. Furthermore, since the heat transfer plate is detachably attached, disassembly is extremely easy, which is preferable for reusing the basket components.
[0032]
Further, a recycled fuel assembly storage basket according to the next invention further includes a heat transfer that engages with the plate member, the first plate member, or the second plate member in the recycled fuel assembly storage basket. A plate fixing member is provided, and the heat transfer plate is fixed to the heat transfer plate fixing member by fastening means. In this way, the heat transfer plate is fixed to the first plate member or the like by the fastening means via the heat transfer plate fixing member that engages with the first plate member or the second plate member. It can be more securely fixed to the first plate member or the like.
[0033]
The recycled fuel assembly storage basket according to the next invention sandwiches a plate-like member in which a plurality of cut portions are formed at the long-side end and a short-side end of the adjacent plate-like member. A heat transfer plate having a substantially U-shaped cross section having claws on both sides, the long-side end portions of the plate-like member are orthogonal to each other, and the cut portions are engaged to form the plate-like member. A plurality of cells that store the recycled fuel assemblies are formed by stacking a plurality of stages, and the heat transfer plates are disposed between the short-side ends of the plate-like members adjacent to each other in a direction orthogonal to the stacking direction of the plate-like members. A plurality of the heat transfer plates are attached to the end portions on the short side of the plate-like member with the inside of the claw provided on both sides of the heat transfer plate abutting against the outer surface of the plate-like member It is characterized by that.
[0034]
This recycled fuel assembly storage basket is configured by stacking a plurality of stages of plate-like members alternately perpendicular to each other and attaching a heat transfer plate to the outer periphery thereof in a detachable manner. For this reason, since it is not necessary to weld a heat exchanger plate to a plate-shaped member, a basket can be assembled easily. Thereby, labor and labor for manufacturing the basket can be reduced and the basket can be efficiently manufactured, and it is very easy to disassemble, which is suitable for reusing the basket components. In addition, since the heat transfer plate is passed to the adjacent plate member and the inside of the claws provided on both sides of the heat transfer plate is brought into contact with the outer surface of the plate member so that the heat transfer plate is detachably attached, A heat transfer plate can be easily attached to a basket constituted by plate-like members.
[0035]
Further, as in the recycled fuel assembly storage basket according to the next invention, a recess into which the claw of the heat transfer plate is fitted may be formed in the vicinity of the end on the short side of the plate member. . In this way, the claw of the heat transfer plate fits into the recess, so that the heat transfer plate can be more reliably prevented from falling off. As a result, the basket can be easily handled as a single unit, so that the operation of storing the basket in the cavity of the recycled fuel storage container is facilitated.
[0036]
The recycled fuel assembly storage basket according to the next invention is the recycled fuel assembly storage basket, wherein the plate member, the first plate member, and the second plate member are made of B-Al material. It is characterized by being. For this reason, sufficient strength of the recycled fuel assembly storage basket can be ensured by the tough B-Al material while exhibiting sufficient neutron absorption capacity in the recycled fuel assembly storage basket. In addition, since the heat exchanger plate does not need to have neutron absorption capability, it does not necessarily need to manufacture with a B-Al material. However, if the excellent mechanical properties of the B—Al material are utilized, a tougher recycled fuel assembly storage basket can be constructed.
[0037]
In the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, the B content of the B-Al material is 1.5 mass% or more and 7.0 mass% or less. It is characterized by that. For this reason, sufficient toughness can be ensured while exhibiting sufficient neutron absorption capability in the recycled fuel assembly storage basket. Moreover, since B content is 7 mass% or less, an extrusion molding process can also be performed comparatively easily. This makes it easy to mold even a plate-shaped member having a large size.
[0038]
  Further, the recycled fuel assembly storage basket according to the next invention is the above-mentioned recycled fuel assembly storage basket, wherein the B-Al material has a total or part of the boron content.B with neutron absorption ^Ten ConcentratedConcentrated boron is added.
[0039]
Natural boron contributes to the absorption of neutrons B^TenDoes not contribute to neutron absorption¹¹There is. B with neutron absorption^TenIf the same amount of boron is added, natural boron and B_FourB compared to using C as it is^TenThe amount of neutron absorption can be increased by the amount of. In this recycled fuel assembly storage basket, this concentrated boron is used for the B-Al material constituting the plate-like member and the like. For this reason, since the same neutron absorption ability can be obtained with a plate-like member or square pipe having a thinner plate thickness than when natural boron is used as it is, the recycled fuel assembly storage basket can be made lighter and more compact. . Further, since the cavity space of the cask cylinder body can be reduced accordingly, the cylinder body can be made compact. On the other hand, natural boron and B_FourSince the neutron absorption capacity can be increased by adding the same amount of concentrated boron as when C is used as it is, sufficient safety against criticality can be ensured even when storing a highly burned recycled fuel assembly.
[0040]
The recycle fuel assembly storage container according to the next invention is the recycle fuel assembly storage basket in which the inner shape of the cavity of the recycle fuel assembly storage container body is matched with the outer shape of the recycle fuel assembly storage basket. And the recycled fuel assembly is stored in the cell. Since this recycled fuel assembly storage container includes the recycled fuel assembly storage basket in the cavity, it can be easily manufactured and the manufacturing cost can be kept low. The recycle fuel assembly storage container referred to in the present invention includes a recycle fuel assembly storage container such as a cask, a canister or the like (the same applies hereinafter).
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same. The recycle fuel assembly storage basket for storing the recycle fuel assembly described below is mainly used for a recycle fuel assembly storage container such as a cask or canister, but is not limited to this. Besides a cask, it can be used, for example, in a rack of a recycled fuel storage pool. The basket for storing a recycled fuel assembly according to the present invention stores either a recycled fuel assembly for a PWR (Pressurized Water Reactor) or a BWR (Boiling Water Reactor). It can be applied in some cases. In the following description, a basket means a recycled fuel assembly storage basket.
[0042]
(Embodiment 1)
First, an outline of a cask and a canister as a premise of the present invention will be described. FIG. 1 is an explanatory diagram showing an outline of a cask. The cask 200 includes a trunk body 201, a heat transfer fin 207 attached to the outer periphery of the trunk body 201, and an outer cylinder 205 attached to the other long side end of the heat transfer fin 207. The trunk body 201 has a sufficient thickness to exhibit a γ-ray shielding function.
[0043]
A bottom plate (not shown) is attached to the trunk body 201, and the bottom plate can be attached to the cylindrical trunk body 201 by welding. Also, by inserting a metal billet into a container having an internal shape that matches the outer shape of the trunk body 201, and hot expanding the metal billet with a perforated punch having an outer shape that matches the inner shape of the trunk body 201 The trunk body 201 and the bottom plate may be molded integrally or may be manufactured by casting.
[0044]
The interior of the trunk body 201 serves as a cavity 201c in which a basket for storing the recycled fuel assembly is stored. The basket stored in the cavity 201c is a basket according to the present invention, and details thereof will be described later. In this example, the shape in the cross section perpendicular to the axial direction (direction indicated by Z in the drawing) of the cavity 201c is circular, but other shapes such as an octagon, a substantially cross shape, and a staircase shape may be used depending on the specifications of the cask 200. A cavity with a cross-sectional shape can also be used. In particular, if the cavity 201c has a shape that matches the outer shape of the basket according to the present invention, the extra space of the trunk body 201 can be reduced, and a spacer for adjusting the outer shape of the basket is not necessary, so the number of parts is reduced. it can. After the recycled fuel assembly is accommodated in the cavity 201c, it is sealed twice with a primary lid and a secondary lid (not shown) in order to prevent leakage of radioactive material from the cavity 201c. In order to ensure sealing performance, a metal gasket is provided between the primary lid and the secondary lid and the trunk body 201 (not shown).
[0045]
A plurality of heat transfer fins 207 made of a plate-like member are radially attached to the outer periphery of the trunk body 201. The heat transfer fins 207 are made of a heat conductive material such as an aluminum plate or a copper plate, and are joined to the outer periphery of the trunk body 201 by welding or other joining means. An outer cylinder 205 made of carbon steel having a thickness of several centimeters is attached to the outside of the heat transfer fin 207 by welding or other joining means. The recycled fuel assembly housed in the cavity 201c generates decay heat, but the decay heat transmitted through the trunk body 201 is conducted to the outer cylinder 205 via the heat transfer fins 207, and then the outer cylinder 205 Released from the surface into the atmosphere.
[0046]
In a space 209 surrounded by the trunk body 201, the outer cylinder 205, and the two heat transfer fins 207, a resin, polyurethane, or a polymer material containing a large amount of hydrogen having a neutron shielding ability to absorb neutrons, or Filled with silicon or other neutron absorbing material (same below). With this neutron absorbing material, neutrons emitted from the recycled fuel assembly are shielded, and neutrons leaking to the outside of the cask 200 are suppressed to a regulation value or less.
[0047]
The cask 200 is used for transporting and storing after storing the recycled fuel assembly. When transporting the cask, shock absorbers (not shown) are attached to both ends of the cask so that sufficient sealing performance can be ensured even if a cask 200 dropping accident or the like occurs.
[0048]
Next, the canister will be described. FIG. 2 is an explanatory diagram showing an outline of the canister. The canister 300 is a tubular container made of steel or stainless steel for enclosing recycled fuel. The canister 300 is a cylindrical container made of steel or stainless steel having a wall thickness of 1 to 3 cm. Unlike the cask 200, it does not have a radiation shielding function.
[0049]
The canister 300 is constituted by a cylindrical trunk body 301 having a bottom, and a basket for storing a recycled fuel assembly is stored in the cavity 301c. After the recycled fuel assembly is stored in the canister 300, the cavity 301c is sealed with a lid (not shown). The canister 300 containing the recycled fuel assembly is stored, for example, in a concrete cask 305 and stored for a long time.
[0050]
3 and 4 are explanatory views showing a recycled fuel assembly storage basket according to Embodiment 1 of the present invention. 5-7 is explanatory drawing which shows the plate-shaped member which comprises the basket for recycle fuel assembly storage which concerns on Embodiment 1 of this invention. In this recycled fuel assembly storage basket 10, a plate-like member 310 provided with a cut portion 312 at the long side end portion 310lt is orthogonal to each other, and the cut portion 312 is combined. It is characterized in that 318 is detachably attached.
[0051]
The basket 10 is configured by providing cut portions 312 in a belt-like plate-like member 310 having through holes 311 and alternately stacking the plate-like members 310 so as to be orthogonal to each other. As a result, a plurality of cells 307 (see FIG. 1) for storing the recycled fuel assemblies are formed. Here, as the material of the plate member 310 and the heat transfer plate 318, B or an Al alloy obtained by adding boron to aluminum or an aluminum alloy is used. This B-Al alloy will be described later.
[0052]
The through-hole 311 is formed in the longitudinal direction of the plate-like member 310 so that the cross section thereof becomes a Japanese character, and a plurality of communication holes are formed in the central rib 313 (not shown). In this embodiment, the number of ribs 313 is one, but the number of ribs 313 is not limited to this. Further, the through hole 311 communicates with the through hole 311 of the other plate-like member 310 through the notch portion 312. Further, a communication hole 314 for communicating the through holes 311 of the plate-like member 310 positioned in the stacking direction of the plate-like members 310 is provided on the end surface in the longitudinal direction of the plate-like member 310.
[0053]
Further, as shown in FIG. 4, a concave portion 316 and a convex portion 315 are formed at the long side end portion 310lt of the plate-like member 310, respectively. The plate members 310 positioned above and below are positioned by the recesses 316 and the projections 315. As a result, almost no step is generated on the inner surface of the cell 307 (see FIG. 1), so that the recycled fuel assembly can be smoothly stored in the cell 307.
[0054]
Here, when the narrow protrusion 415 and the groove 416 are provided as in the plate-like member 410 shown in FIG. 5A, a communication hole used as a drain hole or an air vent hole by the drill 420 is provided. When opening, the drill 420 is easily displaced. For this reason, it is necessary to cut in advance the part which opens the communicating hole of the projection part 415, and the extra process was required. Further, when trying to open the communication hole from the groove 416 to the protrusion 415 with the drill 420, the hole position on the protrusion 415 side may be shifted. As shown in FIG. 5 (b), the plate-like member 310 constituting the basket 10 according to the first embodiment of the present invention has a convex section 315 and a concave section 316 having a rectangular cross-sectional shape. The width is also larger than the protrusion 415 and the groove 416. For this reason, the communication hole can be opened in the convex part 315 and the concave part 316 with the drill 420 stably, and work efficiency improves.
[0055]
Here, even though the through-hole 360 (see FIG. 9B) that is a connecting means is passed through the communication hole 314 over the entire length of the basket 10, the plate-like member 310 stacked by the through-bolt 360 is fixed. Good. This is preferable because the basket 10 can be firmly fixed to form a highly rigid basket. In addition, since the basket 10 can be handled as a single unit, the insertion into the trunk body 201 is facilitated.
[0056]
Next, the relationship between the convex part 315 and the recessed part 316 is demonstrated using FIG. Width W of convex portion 315₁Is the width W of the through-hole 311 of the plate-like member 310₂And approximately the same size. Also, the width W of the recess 316_ThreeIs the width W of the projection 315 fitted here₁Larger than The plate-like member 310 is manufactured by extruding a powder metallurgy material of a B—Al alloy. However, since the width of the convex portion 315 and the concave portion 316 is large, the B-Al alloy that is a hardly extrudable material is extruded. Even in this case, the life of the extrusion die can be extended, which is preferable. In addition, it is preferable to shape | mold the corner | angular part 310c of the plate-shaped member 310 in a sharp edge. Specifically, the radius of the corner portion 310c is preferably 0.4 times (0.4t) or less, and more preferably 0.2 times (0.2t) or less of the thin portion plate thickness t of the plate-like member 310. Is preferred. By doing so, it is possible to reduce the stress transmission unevenness in the corner portion 310c, and therefore it is possible to suppress the stress concentration and to prevent the plate-like member 310 from being damaged.
[0057]
Further, like the plate-like member 310 ′ shown in FIG.₁May be formed. In this way, since the convex portion 315 of the plate-like member 310 is thinned, the mass of the plate-like member 310 ′ can be made smaller than that of the plate-like member 310. Thus, it is preferable to configure the basket using the plate-shaped member 310 ′ because the mass of the entire basket can be reduced as compared with the case where the plate-shaped member 310 is used. Further, the space surrounded by the two protrusions 315 ′ and the recess 316 of the plate-like member 310 ′ can be used as a flux trap.
[0058]
Further, as shown in FIG. 7A, recesses 316 are formed at both long side ends of the plate-like member 310 ″, and a key 361 (FIG. 7B) is fitted into the recess 316 to form a plate. The members 310 may be positioned with respect to each other. If it does in this way, as shown in FIG.7 (c) and (d), if the shape of key 361 'or key 361' 'is devised, it will be between the long side edge parts of plate-shaped member 310' '. A flux trap 310f '' can be formed.
[0059]
Next, the heat transfer plate 318 attached to the outer periphery of the basket 10 will be described. FIG. 8 is an explanatory view showing a heat transfer plate according to Embodiment 1 of the present invention. Moreover, FIG. 9 is explanatory drawing which shows the attachment structure of the heat exchanger plate which concerns on Embodiment 1 of this invention. Claws 318c that can be inserted into the through holes 311 of the plate-like member 310 are formed at both ends 318t of the heat transfer plate 318, and the heat transfer plate 318 has a substantially U-shaped cross section. The claw 318c has a notch 318cc. When the heat transfer plate 318 is attached to the short side end 310st of the plate member 310, the notch 318cc is fitted over the rib 310l of the plate member 310 or the long side end 310lt to be combined. It has become. Also, the length D of the claw 318c₁Is a size that can secure a heat transfer area that can quickly receive from the plate-like member 310 the decay heat generated by the recycled fuel assembly stored in the cell 307 (see FIG. 1) of the basket 10. .
[0060]
The heat transfer plate 318 is produced by extruding an Al material to produce a long material 380 having a substantially U-shaped cross section (see FIG. 8B), and cutting this into the length of the heat transfer plate 318, It is manufactured by forming a notch 318cc in the claw 318c. The heat transfer plate 318 does not need to have a neutron shielding function, and does not require much strength. For this reason, it is not always necessary to use a B—Al alloy for the heat transfer plate 318, and an Al material that can be easily extruded can be selected and used. The heat transfer plate 318 may be manufactured by casting, or may be manufactured by bending a plate material.
[0061]
Next, the mounting structure of the heat transfer plate 318 will be described. As shown in FIG. 9, the heat transfer plate 318 is attached to the short side end portion 310 st of the plate-like member 310 and covers the outer periphery of the basket 10. FIG. 9A shows an example in which the heat transfer plate 318 is attached so as to straddle the two plate-like members 310. FIG. 9B shows an example in which the heat transfer plate 318 is attached so as to connect the plate members 310 adjacent to each other in the direction perpendicular to the stacking direction of the plate members 310. If the heat transfer plate 318 is attached as shown in FIG. 9A, the upper and lower plate-like members 310 are connected by the heat transfer plate 318. Therefore, after the heat transfer plate 318 is attached, the basket 10 is integrated. It can be handled. Thereby, after the basket 10 is assembled, it can be easily handled, and the cask 200 can be easily inserted into the cavity 201c.
[0062]
On the other hand, as shown in FIG. 9B, when the basket 10 is configured by attaching the heat transfer plates 318 to the adjacent plate-like members 310 and laminating them, the steps of the basket 10 are assembled separately. As a result, the assembly of each stage can proceed at the same time to improve productivity. In the structure shown in FIG. 9B, the plate-like member 310 can be fixed by passing through bolts 360 through the entire length of the basket 10 through the communication holes 314. In this way, the basket 10 can be firmly fixed, and the basket 10 can be handled as a unit, so that the insertion into the trunk body 201 is facilitated. Here, in order to prevent radiation from being scattered, the recycled fuel is stored in the basket 10 underwater. However, the communication hole 314 also serves to remove air from the through hole 311 when the basket 10 is placed in water. .
[0063]
The claw 318c of the heat transfer plate 318 may be simply inserted into the through hole 311 of the plate member 310 to attach the heat transfer plate 318 to the plate member 310, but in order to attach the heat transfer plate 318 more securely, fixing means It is preferable to fix the heat transfer plate 318 to the plate-like member 310. Next, this fixing means will be described. 10-14 is explanatory drawing which shows the fixing structure of the heat exchanger plate which concerns on Embodiment 1 of this invention. As shown in FIG. 10A, as a fixing means, a heat transfer plate is formed by inserting a stopper 370 having a substantially U-shaped cross section made of a stainless steel plate or the like with the U-shaped apex facing the back of the through hole 311. 318 may be fixed.
[0064]
At this time, as shown in FIG. 10B, a convex portion 370 t may be provided on the side portion of the stopper 370, and this may be fitted into the concave portion 318 u formed on the heat transfer plate 318. This is preferable because the risk of the stopper 370 dropping off can be reduced. In this heat transfer plate 318 fixing structure, the stopper 370 is simply fitted between the heat transfer plates 318, so that assembly and disassembly are easy. Thus, it is preferable to fix the heat transfer plate to the plate-like member because the plate-like member can be prevented from falling off. Further, since the plate member and the heat transfer plate are integrated by the fixing means, the basket 10 has a stronger structure.
[0065]
Here, the stopper 370 may be inserted into a part of the heat transfer plate 318 as shown in FIG. 10 (c), or the stopper 370 is transferred at substantially the same height as the heat transfer plate 318 as shown in FIG. 10 (d). The hot plate 318 may be inserted over the entire height direction. In the former configuration, the heat transfer performance can be made higher than in the latter configuration. On the other hand, since the size of the stopper 370 can be increased in the latter configuration, the heat transfer plate 318 can be fixed more firmly than in the former configuration.
[0066]
The fixing structure shown in FIG. 11 is a case where removal of the heat transfer plate 318 ′ is not considered. Thus, the cross-sectional shape of the claw 318 c ′ of the heat transfer plate 318 ′ is formed in a saw shape, the cross-sectional width h and the width W of the through hole 311 provided in the plate-like member 310._ThreeAnd W_ThreeThe relationship of ≦ 2 × h is satisfied. In this way, the plate-like member 310 can be firmly attached to the heat transfer plate 318 ′.
[0067]
The heat transfer plate 319 used in the fixing structure shown in FIG. 12 has substantially the same structure as the heat transfer plate 318 (see FIG. 10), but is transferred to the outside of the claws 319c provided at both ends of the heat transfer plate 319. The difference is that a pedestal 319p of a bolt 362 for attaching a hot plate is provided. In addition, the heat transfer plate 319 has a mounting structure in which the claw 319c of the heat transfer plate 319 is pressed against the inner wall of the through hole of the plate member 310 by the bolt 362 and the wedge-shaped member 364 as fastening means. A feature is that 319 is fixed to the plate-like member 310.
[0068]
The claw 319 c of the heat transfer plate 319 is inserted into the through hole 311 of the plate member 310, and the heat transfer plate 319 is attached to the plate member 310. At this time, the bolt 362 is passed through the bolt hole 319h provided in the base 319p, the bolt 362 and the wedge-shaped member 364 in which the screw hole 364sh is formed are temporarily fixed, and then the heat transfer plate 319 is attached to the plate-shaped member 310. Install. The wedge-shaped member 364 may have a truncated cone shape as shown in FIG. 1A or a quadrangular frustum shape as shown in FIG. When the wedge-shaped member 364 has a quadrangular pyramid shape, the wedge-shaped member 364 does not rotate when the bolt 362 is tightened, which improves workability.
[0069]
After the heat transfer plate 319 is attached to the plate member 310, the bolt 362 is tightened to move the wedge member 364 to the short side end 310st of the plate member 310. The wedge-shaped member 364 has a stepped area that decreases toward the short-side end portion 310st, and the width W of the through hole 311 into which the wedge-shaped member 364 is inserted._ThreeSince the wedge-shaped member 364 moves, the claw 319c is pressed toward the inner wall of the through hole 311. As a result, the heat transfer plate 319 is fixed to the plate member 310. Further, if the bolt 362 is loosened, the heat transfer plate 319 can be easily detached from the plate member 310. Use of the wedge-shaped member 364 and the bolt 362 is preferable because the heat transfer plate 319 can be firmly attached to the plate-shaped member 310 by the fastening force of the bolt 362.
[0070]
As shown in FIG. 12D, the heat transfer plate 319 may be fixed by a wedge-shaped member 364 and a bolt 362 in such a shape that the two heat transfer plates 319 are combined with each other. In addition, as shown in FIG. 12E, the heat transfer plate 319 may be fixed by a bolt 362 and a wedge-shaped member 364 that are passed through the joint of the two heat transfer plates 319. At this time, if the washer-363 is disposed between the bolt 362 and the heat transfer plate 319, the wedge-shaped member can be more reliably fixed. With such a structure, both heat transfer plates 319 can be fixed to the through holes 311 of the plate-like member 310 in a balanced manner.
[0071]
FIG. 13 shows a structure for fixing the wedge-shaped member 364 without using the pedestal 319p. A plate-like member 384 having a bolt hole 384h is disposed between two adjacent heat transfer plates 319 ′. The width W of the plate member 384_FiveIs the interval W between adjacent heat transfer plates 319 ′.₆Therefore, when the wedge-shaped member 364 is moved by the bolt 362, the plate-shaped member 384 is supported by the two heat transfer plates 319 ′. As a result, when the bolt 362 is tightened, the wedge-shaped member 364 moves to the short side end portion 310st of the plate-shaped member 310, so that the claw 319c ′ of the heat transfer plate 319 ′ is pressed against the wall surface of the through hole 311. The heat transfer plate 319 ′ is fixed to the plate-like member 310. According to this structure, since it is not necessary to provide the base 319p (refer FIG. 12) which makes the heat transfer plate 319 'penetrate the volt | bolt 362, the shape of heat transfer plate 319' can be simplified. As shown in FIG. 13 (a), it is preferable to form the step where the heat transfer plate 319 ′ and the plate-like member 310 are in contact with each other so that the outside of the basket 10 is substantially flat. .
[0072]
In the above example, a slit 319s is provided in a portion where the claw 319c and the like are in contact with the wedge-shaped member 364 so that the claw 319c is easily pressed against the inner wall of the through hole 311. This is preferable because the pressing force generated between the claw 319c and the inner wall of the through hole 311 can be generated more effectively, and the heat transfer plate 319 can be more securely fixed to the plate member 310. Note that the slit 319s is not necessarily provided. Further, as shown in FIG. 13B, a portion of the claw 319c that contacts the wedge-shaped member 364 may be formed on a tapered surface 319tp so that a wedge-shaped member larger than the taper can be used. In this way, since the rigidity at the tip of the taper formed on the claw 319c is reduced, the claw 319c can be pressed against the inner wall of the through-hole 311 with a larger area, and the heat transfer plate 319 is more reliably attached to the plate-like member. 310 can be fixed.
[0073]
The heat transfer plate 320 used in the fixing structure shown in FIG. 14 has substantially the same structure as the heat transfer plate 318 (see FIG. 8), but the claws 320c provided at both ends of the heat transfer plate 320 are plate-shaped. The difference is that the pressing force is applied to the inner wall of the through hole of the member 310. When the claw 320 c of the heat transfer plate 320 is inserted into the through hole 311, the claw 320 c gives a pressing force to the inner wall of the through hole, so that the heat transfer plate 320 is fixed to the plate-like member 310.
[0074]
On the claw 320 c of the heat transfer plate 320, a convex portion 320 ct that protrudes toward the inside of the heat transfer plate 320 is formed. The protrusion 320ct may be formed on at least one of the claws 320c, and is not necessarily provided on both the claws 320c as shown in FIG. The convex portion 320ct has an inner interval l between the claws 320c.₁Is the interval l between the inner walls of the through holes of adjacent plate-like members 310₂It is formed so as to be smaller.
[0075]
With such a structure, when the claw 320c of the heat transfer plate 320 is inserted into the through hole 311 of the plate-like member 310, the inner distance l of the claw 320c is increased.₁And the claw 320c has its original inner distance l due to its elasticity.₁Try to keep. As a result, the claw 320 c is pressed against the inner wall of the through hole of the plate member 310, so that the heat transfer plate 320 is fixed to the plate member 310. Further, as shown in FIG. 14B, a recess 311u is provided in a portion of the inner wall of the through hole where the claw 320c abuts, and the projection 320ct of the claw 320c is fitted into the recess 311u when the heat transfer plate 320 is attached. It may be. This is preferable because the heat transfer plate 320 can be more reliably fixed and the heat transfer plate 320 can be prevented from falling off.
[0076]
In this heat transfer plate 320 mounting structure, the heat transfer plate 320 is fixed to the plate-like member 310 by the elastic force of the claws 320 c provided on the heat transfer plate 320, so that the claws 320 c of the heat transfer plate 320 are fixed to the plate-like member 310. The heat transfer plate 320 can be fixed simply by being inserted into the through hole 311. Thereby, the basket 10 can be assembled more easily. Moreover, since it is not necessary to use a special member such as a wedge-shaped member as described above for fixing the heat transfer plate 320, the cost of the basket 10 can be reduced correspondingly.
[0077]
As for the external shape of the basket 10, its four surfaces are flush with the heat transfer plate 318 and the other four surfaces have an angular cross-sectional shape. The inner shape of the cavity 201c is flush with the surface portion (301a) of the basket 10 so as to be in close contact with each other, and the portion corresponding to the angular cross-sectional portion (301b) of the basket 10 is substantially matched to the shape. Become. Thereby, decay heat can be efficiently transmitted from the heat transfer plate 318 or the like to the trunk body, and the ratchet of the basket 10 can be suppressed and reliably fixed.
[0078]
As mentioned above, although Embodiment 1 of this invention was demonstrated, about the attachment structure of the basket 10 demonstrated here, the heat exchanger plate 318, etc., a heat exchanger plate, etc. also in embodiment described below as needed. Can be applied.
[0079]
(Embodiment 2)
FIG. 15 is an explanatory view showing a basket according to Embodiment 2 of the present invention. FIG. 16 is an explanatory view showing a plate-like member constituting a basket according to Embodiment 2 of the present invention. This basket 11 is characterized by the following points. That is, a plurality of stages are stacked such that the long side end portions 510Llt of the long plate-like member 510L that is the first plate-like member are orthogonal to each other. A plurality of cells that store the recycled fuel assemblies by disposing the short plate member 510S as the second plate member between the long plate members 510L adjacent to each other in the stacking direction of the long plate members 510L. To form the basket 11. At this time, the claw of the heat transfer plate is inserted into the opening of the long plate member 510L or the short plate member adjacent to the direction perpendicular to the step stacking direction of the long plate members 510L, thereby extending the heat transfer plate. You may attach to a scale plate member or a short plate member so that attachment or detachment is possible. Since the operation and effect of the configuration in which the heat transfer plate is detachably attached to the long plate-like member and the like are as described in the first embodiment, the description thereof is omitted. Next, a detailed configuration of the basket 11 according to the second embodiment will be described.
[0080]
As shown in FIGS. 15 (a) and 15 (b), the basket 11 is stacked in a plurality of stages such that the long side end portions 510Llt of the long plate-like member 510L are orthogonal to each other. As shown in FIG. 16A, the long plate-like member 510L is provided with a through hole 511. In addition, a convex portion 515 and a concave portion 516 are formed on the long side end portion 510Llt of the long plate-like member 510L. When the long plate-like members 510L are combined at their long side end portions 510Llt, the convex portions 515 and the concave portions 516 are fitted to each other, and the long plate-like members 510L are prevented from shifting.
[0081]
As shown in FIG. 16 (a), the long-side end portion 510Llt of the long plate-like member 510L on which the convex portion 515 is formed has a width B substantially the same as the thickness b of the long plate-like member 510L. A plurality of notches 515c are formed at intervals P. The size of the interval P is substantially equal to the width of the cell 507 (FIG. 15C) that stores the recycled fuel assembly. The relationship between the width B and the thickness b of the long plate-like member 510L is B ≧ b. Thus, since the notch 515c is formed in the convex part 515, the strength reduction of the elongate plate-shaped member 510L by forming the notch 515c can be made extremely small. As shown in FIGS. 16 (a) and 16 (b), since the long-side end portion 510Llt of the long plate-like member 510L to be stacked fits into the notch 515c, the long plate-like members 510L are mutually connected. While being positioned, the long plate-like member 510L is prevented from shifting.
[0082]
By simply stacking the long plate-like members 510L in a plurality of stages, the compartment for storing the recycled fuel assembly cannot be completely partitioned. Therefore, the short plate-like member 510S is disposed between the long plate-like members 510L. The compartment for storing the recycled fuel assembly is completely partitioned. As shown in FIG. 16C, a through hole 511 is formed in the short plate-like member 510S. Here, the length H of the short plate-like member 510S is substantially equal to the width Y of the cell 507 (FIG. 15C) that stores the recycled fuel assembly.
[0083]
Moreover, the convex part 515 and the recessed part 516 are each formed in both edge part 510Slt in which the through-hole 511 in the short plate-shaped member 510S is not opening. The convex portion 515 fits into the concave portion 516 formed in the long side end portion 510Llt of the long plate-like member 510L, and the concave portion 516 is fitted to the long side end portion 510Llt of the long plate-like member 510L. It fits into the formed convex part 515. With such a structure, the short plate-like member 510S is positioned and the short plate-like member 510S is prevented from being displaced. The space partitioned in this way becomes a cell 507 for storing the recycled fuel assembly (FIG. 15C).
[0084]
The stacked long plate-like members 510L are fixed to each other through the through-bolts 562 that are connecting members in the communication holes 514 provided in the long plate-like member 510L. Here, the length of the through bolt 562 extends over the entire length of the basket 11. Thus, when the long plate-like members 510L are fixed to each other with the through bolts 562, the basket 11 can be handled as an integral unit without using the heat transfer plate 318 described below. Moreover, if it fixes with the through bolt 562, the rigidity of the basket 11 can also be improved.
[0085]
Further, the claw 318c of the heat transfer plate 318 is inserted into a through-hole 511 that opens to the short side end portion 510Lst of the long plate-like member 510L and the short side end portion 510Sst of the short plate-like member 510S. A heat transfer plate 318 is attached. At this time, since the heat transfer plate 318 is attached so as to straddle the long plate-like member 510L and the short plate-like member 510S, the long plate-like member 510L and the short plate-like member 510S are connected by the heat transfer plate 318. Thus, the basket 11 is integrated. By attaching the heat transfer plate 318 in this way, the basket 11 can be handled as an integral unit without fixing the basket 11 with the through bolts 562. Further, if the through bolt 562 and the heat transfer plate 318 are used in combination, the rigidity of the basket 11 can be further improved. As described in the first embodiment, the heat transfer plates 318 are connected so that the long plate members 510L or the short plate members 510S adjacent to each other in the direction perpendicular to the stacking direction of the long plate members 510L are connected. May be attached (see FIG. 9B). In this way, since each stage of the basket 11 can be assembled separately, the assembly of each stage can be advanced simultaneously to improve productivity.
[0086]
As in the basket 10 according to the first embodiment (see FIG. 3), it is necessary to form the notch portion 312 at the long side end portion 310lt of the plate-like member 310. The cut portion 312 is about ¼ of the short side length of the plate-like member 310, and it takes a lot of time to form the cut portion 312. Material wasted by the size. In the basket 11 according to the second embodiment, the size of the notch 515c is the height of the convex portion 515 or the concave portion 516, so that the processing is easy and the waste of material can be greatly reduced.
[0087]
Further, as compared with the basket 10 according to the first embodiment, the number of the long plate-like members 510L forming the notches 515c can be reduced to about half. Then, the short plate member 510S is arranged in a space that cannot be partitioned by the long plate member 510L alone. The short plate-like member 510S can be manufactured simply by cutting the long plate-like member 510L, and this processing is easier than forming the notch 515c. Thereby, the man-hour required for the process of the element which comprises the basket 11 can be reduced. Furthermore, since the basket 11 can be configured by stacking the long plate-like member 510L and the short plate-like member 510S side by side, the basket 11 can be easily manufactured.
[0088]
FIG. 17 is an explanatory view showing another long plate-like member according to Embodiment 2 of the present invention and a basket using this long plate-like member. As shown in FIG. 5A, the long plate-like member 510L ′ constituting the basket 11 ′ has a long-side end portion 510L′lt in which the concave portion 516 is formed. Notches 516c into which the convex portions 515 fit are formed at predetermined intervals. When the long plate-like members 510L ′ are stacked so as to be orthogonal to each other, the convex portion 515 of the long plate-like member 510L ′ fits into the notch 516c. The interval between the cutouts 516c is substantially equal to the width of the cell 507 (FIG. 15C) that stores the recycled fuel assembly. Also, the width w of the notch 516c₂And width w of convex portion 515₁And w₁≦ w₂Satisfy the relationship.
[0089]
Since only the long plate member 510L ′ cannot constitute a cell for storing the recycled fuel assembly, the short plate member 510S is disposed between the long plate members 510L ′ as shown in FIG. 17B. Thus, the basket 11 ′ is configured. Compared with the basket 11, the basket 11 ′ can easily form a notch 516 c in the long side end portion 516 L′ lt of the long plate-like member 510 L ′ constituting the basket 11 ′.
[0090]
Here, the fixing structure of the heat transfer plate 318 will be described. FIG. 18 is an explanatory view showing a heat transfer plate fixing structure according to Embodiment 2 of the present invention. In order to securely fix the short plate-like member 510S located on the outer peripheral portion of the basket 11, it is preferable to apply a fixing structure as described below. In this fixing structure, the heat transfer plate fixing member 566 is attached in the vicinity of the short side end portion 510Lst of the long plate-like member 510L and the short plate-like member 510S, and the bolt 362 and the heat transfer plate fixing member 566 as fastening means are attached. The plate member 318 is fixed to the long plate member 510L or the like via
[0091]
As shown in FIG. 18, a fixing member mounting hole 510sh into which the heat transfer plate fixing member 566 is inserted is formed in the vicinity of the short side end portion 510Lst of the long plate member 510L and the short plate member 510S. . The heat transfer plate fixing member 566 is provided with a bolt hole 566bh into which the bolt 362 is screwed. The claws 318c1 and 318c2 provided on the heat transfer plate 318 respectively include a through hole 511 in the short side end portion 510Lst of the long plate-like member 510L and a through hole 511 in the short side end portion 510Sst of the short plate-like member 510S. Plugged into. Accordingly, the heat transfer plate 318 is attached so as to straddle the long plate-like member 510L and the short plate-like member 510S, and thus the short plate-like member 510S is securely fixed to the long plate-like member 510L.
[0092]
When the heat transfer plate 318 is attached to the long plate-like member 510L or the like, the bolt 362 is passed through the bolt hole 318bh formed in the heat transfer plate 318, and the bolt 362 is screwed into the bolt hole 566bh of the heat transfer plate fixing member 566. The heat transfer plate 318 is fixed to the long plate-like member 510L. Further, the heat transfer plate fixing member 566 is inserted into a fixing member mounting hole 510sh formed in the long plate-like member 510L and engaged with the long plate-like member 510L and the like.
[0093]
Here, in the heat transfer plate fixing structure according to the first embodiment (see FIGS. 12 and 13), the frictional force between the claws 318 c provided on the heat transfer plate 318 and the like and the inner wall of the through hole of the plate-like member 310. The plate member 318 and the like are fixed to the plate member 310. In the heat transfer plate fixing structure according to the second embodiment, since the heat transfer plate fixing member 566 that engages with the long plate-like member 510L and the like and the bolt 362 screwed into the heat transfer plate fixing member 566, the heat transfer plate 318 is provided. It can be more securely fixed to the long plate-like member 510L or the like. The fixing structure according to the first embodiment (see FIGS. 12 and 13) is not intended to be excluded, and the fixing structure described in the first embodiment may be applied (see FIGS. 12, 13 and the like). Further, the heat transfer plate fixing structure according to the second embodiment may be applied when the heat transfer plate 318 (see FIG. 8) or the like is attached to the plate-like member 310 in the basket 10 according to the first embodiment. .
[0094]
(Embodiment 3)
19 and 20 are explanatory views showing a basket according to Embodiment 3 of the present invention. The basket 12 is stacked in a plurality of stages by making the long side end portions of the plate-like member 635 in which a plurality of cut portions 636 are formed at the long side end portions orthogonal to each other and engaging the cut portions 636. . The heat transfer plates 618a and 618b are characterized in that the end portions on the short side of the plate member 635 are sandwiched between the claws 618ac and 618bc and the heat transfer plates 618a and 618b are attached to the plate member 635.
[0095]
The plate-like member 635 constituting the basket 12 according to the third embodiment is a solid member. As shown in FIG. 19A, a plurality of notches 636 are formed at the long side end of the plate-like member 635. Then, the long side end portions of the plurality of plate-like members 635 are stacked in a plurality of stages so as to be orthogonal to each other. At this time, the notch portions 636 formed at the respective long side end portions are engaged.
[0096]
As shown in FIG. 19B, the heat transfer plate 618a is configured such that the short side end portions of the adjacent plate members 635 are sandwiched between inner sides 618aci of claws 618ac provided on both sides of the heat transfer plate 618a. The plate-like member 635 is attached to the short side end. Moreover, as shown in FIG.19 (b), the nail | claw 618ac of the heat exchanger plate 618a attached adjacently is inserted between the two claws 618ac in the one side of the heat exchanger plate 618a.
[0097]
FIG. 20A is a partial side view of the basket 12. FIGS. 5B and 5C show plate members constituting the basket 12. The basket 12 includes two types of heat transfer plates 618a and 618b. In the basket 12, the heat transfer plates 618 a are disposed adjacent to each other in a direction perpendicular to the stacking direction of the plate-like members 635. That is, the claw 618ac of the heat transfer plate 618a is inserted between the two claws 618ac on one side of the heat transfer plate 618a, and the heat transfer plate 618a is attached to the end portion on the short side of the plate-like member 635. For this reason, with respect to the direction perpendicular to the stacking direction of the plate-like members 635, the heat transfer plates 618a are alternately displaced by the width of the claws 618ac. In addition, the heat transfer plates 618a and the heat transfer plates 618b are alternately attached toward the stacking direction of the plate-like members 635.
[0098]
In the basket 12 according to the third embodiment, the inner sides 618aci of the claws 618ac provided on both sides of the heat transfer plate 618a and the like are brought into contact with the outer surface of the plate member 635, and the heat transfer plate 618a and the like are moved to the plate member 635. Attach to the short side end. With such a configuration, even if the plate-like member 635 constituting the basket 12 is solid, the heat transfer plate 618 a and the like can be easily attached to the plate-like member 635.
[0099]
20D and 20E show the claws 618ac (618bc) of the heat transfer plate 618a (618b). FIG. 4D shows a taper 618 acc (618 bcc) formed at the tip of the claw 618ac (618 bc). With such a configuration, the heat transfer plate 618a (618b) can be easily attached to the end portion on the short side of the plate-like member 635. FIG. 5E shows the projection 618acc ′ (618bcc ′) formed by bending the tip of the claw 618ac (618bc). In any example, the claw 618ac (618bc) is bent toward the inner side 618aci (618bci) of the heat transfer plate 618a (618b). When the heat transfer plate 618a (618b) is attached to the short side end of the plate-like member 635, the claw 618ac (618bc) spreads, and the claw 618ac (618bc) is pressed against the plate-like member 635 by the elastic force generated at this time. It is done. Accordingly, the heat transfer plate 618a (618b) can be reliably attached to the plate member 635.
[0100]
FIG. 21 is an explanatory view showing another configuration example of the basket according to Embodiment 3 of the present invention. In the basket 12 ′ shown in FIG. 21A, the heat transfer plates 618 a and the heat transfer plates 618 b are alternately arranged in a direction perpendicular to the stacking direction of the plate-like members 635. The claw 618bc of the heat transfer plate 618b is inserted between the two claws 618ac provided on one side of the heat transfer plate 618a.
[0101]
FIG. 21B shows a basket 12 ″ that can be applied when the shape of the cask cavity 201c ′ in the cross section is circular. The basket 12 ″ is substantially the same as the basket 12, 12 ′, but is stored in the cavity 201c ′ having a circular cross-sectional shape, so that as shown in FIGS. The heat transfer surfaces of the hot plates 618a ′ and 618b ′ are formed by curved surfaces. Thus, by matching the heat transfer surface such as the heat transfer plate 618a ′ with the inner surface shape of the cavity 201c ′, it is possible to deal with cavities having various inner surface shapes.
[0102]
FIG. 22 is an explanatory view showing a structure for preventing a heat transfer plate from falling off according to Embodiment 3 of the present invention. In this drop-off preventing structure, a recess 635u into which the claw 618ac of the heat transfer plate 618a is fitted is provided on the short side end 635st side of the plate-like member 635. Like the recess 635u shown in FIG. 22B, the cross-sectional shape may be a rectangle, or may be a recess 635u ′ having a substantially triangular cross section as shown in FIG. When the heat transfer plate 618a is attached to the end portion on the short side of the plate-like member 635, the claw 618ac fits into the recess 635u or the like. At this time, as shown in FIGS. 22 (a) to 22 (c), if a claw 618ac provided with 618acc 'is used, the protrusion 618acc' fits into the recess 635u or the like, so that the heat transfer plate 618a can be more reliably attached. Dropping can be prevented. As a result, the baskets 12 and 12 'can be easily handled as a single unit, so that the operation of storing the basket 12 and the like in the cavity 201c' is facilitated.
[0103]
(Manufacturing method of plate member)
Here, a method for manufacturing the plate-like member 310 will be described. FIG. 23 is a flowchart showing a method for manufacturing a plate member according to the present invention. First, Al or an Al alloy powder is prepared by a rapid solidification method such as an atomizing method (Step S201), and a powder of B or B compound is prepared (Step S202). These two particles are mixed by MA (Mechanical Alloying) described below (step S203). Mixing may be performed in an inert gas atmosphere typified by argon. The reason why B or a B compound is added to Al or an Al alloy is that the recycled fuel assembly storage basket 10 or the like needs a function of preventing the stored recycled fuel assembly from reaching criticality.
[0104]
Here, natural boron has B which contributes to neutron absorption.^TenDoes not contribute to neutron absorption¹¹There is. Therefore, B with neutron absorption ability^TenIf concentrated boron is used, the amount of boron added is the same as that of natural boron as long as the amount of boron added is the same.^TenThe amount of neutron absorption can be increased by the amount of. Therefore, if concentrated boron is used, the same neutron absorption ability can be achieved by using a thinner plate-like member than when natural boron is used as it is. For this reason, when concentrated boron is used, the same neutron absorption ability can be obtained with a thinner plate thickness. Therefore, when it is desired to reduce the weight of the recycled fuel assembly storage basket, it is preferable to use concentrated boron. On the other hand, natural boron and B_FourSince the neutron absorption capacity can be increased by adding the same amount of concentrated boron as when C is used as it is, sufficient safety against criticality can be secured even when storing a highly burned recycled fuel assembly.
[0105]
For the Al or Al alloy, pure aluminum ingot, Al-Cu aluminum alloy, Al-Mg aluminum alloy, Al-Mg-Si aluminum alloy, Al-Zn-Mg aluminum alloy, Al-Fe aluminum An alloy or the like can be used. The B or B compound includes B_FourC, B₂O_ThreeEtc. can be used. Where B against aluminum_FourThe amount of boron added based on C is preferably 1.5% by mass or more and 9% by mass or less. This is because sufficient neutron absorption capacity cannot be obtained when the content is 1.5% by mass or less, and elongation with respect to tension decreases when the content exceeds 9% by mass. Furthermore, from the viewpoint of improving workability, it is preferable that the amount of boron added is 7% by mass or less. If concentrated boron is used, more B can be obtained without impairing processability.^TenNeedless to say, can be added.
[0106]
As the neutron absorbing material other than B, a material having a large neutron absorption cross section such as cadmium, hafnium, rare earth element, etc. can be used in addition to boron. As the rare earth element, oxides such as europium, dysprosium, samarium, and gadolinium can be used. Here, in the case of a boiling water reactor (BWR), B or a B compound is mainly used, but in the case of a pressurized water reactor (PWR), an Ag—In—Cd alloy is used. The composition of the Ag-In-Cd alloy is generally 15% by mass of In and 5% by mass of Cd.
[0107]
B, a neutron absorber_FourIf the average particle size of C is large, the strength of the plate-like member 310 is reduced, while B_FourIf the average particle size of C is reduced, B_FourSince C aggregates and segregates, neutron absorption ability will fall or workability will deteriorate. Therefore, the average particle size of the Al powder is about 80 μm, and B_FourThe average particle size of the C powder is preferably about 9 μm. B_FourThe particle size of C is set to about 9 μm when the particle size is further reduced._FourThis is because the aggregation of the C powder is likely to cause segregation. Therefore, in this production example, instead of the mixer, by using high energy ball milling (mechanical alloying, hereinafter referred to as MA), Al powder and B_FourC powder is refined and B is added to Al powder._FourC powder is dispersed as uniformly as possible. A general rolling mill, a rocking mill, and an attritor mill can be used for the high energy ball milling.
[0108]
In the process of high energy ball milling, the introduced Al is crushed and folded by receiving the impact of the ball, and becomes a flat shape. For this reason, the outer diameter of Al spreads in one direction and becomes about 80 μm. On the other hand, B_FourC powder is crushed by ball milling, and its particle size is reduced to about 0.5 μm to 1.0 μm and is uniformly rubbed into the Al matrix. For this reason, since fine dispersed particles are uniformly dispersed in the base material, the Al alloy obtained by sintering this powder has excellent strength.
[0109]
In this manufacturing method, B_FourSince the C powder can be refined and homogenized and dispersed in the matrix of the Al powder, the strength of the plate member 310 can be improved. Specifically, the strength can be improved by about 1.2 to 1.5 times compared to a plate-like member or the like produced by a mixer. For this reason, it is particularly suitable for use as a plate-like member of a PWR cask having a large recycled fuel assembly mass. Furthermore, B with high hardness_FourC powder is finely and evenly dispersed in the matrix, whereby B_FourSince the aggregation of the C powder is prevented, the extrusion pressure can be lowered. For this reason, there is also an effect of reducing wear of the extrusion die.
[0110]
Next, the mixed powder is put in a rubber case and sealed, and a high pressure is applied uniformly from all directions at room temperature by CIP (Cold Isostatic Press) to form a powder (step S204). By applying pressure uniformly from all directions by CIP, a high-density molded product with little variation in molding density can be obtained.
[0111]
Moreover, it can replace with CIP and a preforming body can also be shape | molded by the high pressure press of a uniaxial direction. Specifically, the mixed powder is put in a mold set in a press machine, and a preform is molded with a high molding pressure of 5000 to 10,000 tons. By pressing with such a very high pressure, the molding density of the preform is made uniform. The degree of uniformity of the molding density is preferably substantially the same as that obtained by the CIP process. In that case, the molding pressure may be determined based on the target molding density. Further, as compared with CIP, it is not necessary to put the mixed powder in a rubber case and evacuate it, and it is only necessary to put the mixed powder in a mold and press it, so that it can be preformed relatively easily.
[0112]
Next, the preform is placed in a sintering furnace, evacuated, and sintered under no pressure (step S205). The degree of vacuum during vacuum sintering is 10^-1The temperature is about Torr and the temperature is 550 ° C to 600 ° C. The holding time of the sintering temperature is appropriately set between 5 hours and 10 hours. Here, the sintering temperature is stepped up at a predetermined temperature pitch while degassing. The powders temporarily hardened by this vacuum sintering are fused to form a neck, which becomes a billet for extrusion.
[0113]
Further, since pressure is not applied during vacuum sintering, unlike HIP and hot press, the mass density of the sintered body is almost the same as that at the time of preforming, and the mass density of 75% to 95% is maintained. . Furthermore, since the oxidation of the billet is prevented by vacuum sintering and canning can be omitted, the cost of cans can be saved, and cutting processes such as external cutting and end face cutting for removing the cans are unnecessary, and the accompanying cans Manufacturing processes such as encapsulation can be omitted.
[0114]
Next, the billet is hot extruded using a porthole extruder (step S206). Extrusion conditions such as heating temperature, extrusion speed, and extrusion force are appropriately changed according to the B content and the aluminum alloy. In addition, it is preferable that an induction heating high frequency coil is provided around a container provided in the porthole extruder, and an RF (Radio Frequency) current is passed through the high frequency coil to inductively heat the billet in the die. .
[0115]
In this induction heating, the billet is heated by generating an induced current. However, since the billet to be heated is in a state where the mixed powders are fused in the vacuum sintering process, the induced current is generated in the entire billet. And efficient heating becomes possible. It has been found that by performing vacuum sintering as in the present invention, the temperature can be raised following the temperature raising program. As a result, the efficiency of induction heating is dramatically increased by vacuum sintering, and the advantage that the billet extrusion speed can be improved is obtained.
[0116]
Here, when a JIS-6N01 Al alloy material is used for the Al base material, after hot extrusion, T₁Process and use. JIS-6N01 Al alloy material is a heat treatment alloy, but when used in a basket for storing recycled fuel assemblies, the material strength is reduced by the decay heat generated from the recycled fuel even if the strength is improved by heat treatment. Decreases. For this reason, after hot extrusion, it is allowed to cool, that is, T₁It is because it is preferable to use it without reducing high temperature strength by processing. The same applies to the case of hot extrusion molding into the shape of the next plate-like member.
[0117]
The billet heated by induction is sent into the container, pushed from behind by a punch, and pushed out as a plate-like member 310 having a predetermined extrusion shape by a die. At this time, the mass density of the billet is 75% to 95%, but since the voids between the powder particles are crushed by extrusion, the mass density of the plate-like member 310 is approximately 100%. Next, after extrusion molding into the shape of the plate-like member 310, tensile correction is performed (step S207), and the unsteady portion and the evaluation portion are cut to obtain a product (step S208).
[0118]
In the above example, a porthole extruder having a high compression ratio and suitable for extruding a complicated material such as aluminum is used as the extruder. However, the present invention is not limited to this. For example, a fixed or moving mandrel method may be employed. Moreover, in addition to direct extrusion, hydrostatic pressure extrusion may be performed, and can be selected as appropriate within the possible range of the parties. Furthermore, although the production efficiency is low, the billet may be batch-processed in a heating furnace instead of the induction heating.
[0119]
【The invention's effect】
As described above, in the recycled fuel assembly storage basket according to the present invention, the plate-like members are alternately stacked in a plurality of stages, and heat transfer plates are detachably attached to the outer periphery thereof. For this reason, since it is not necessary to weld a heat exchanger plate to a plate-shaped member, a basket can be assembled easily. As a result, labor and labor for manufacturing the basket are reduced, the basket can be manufactured efficiently, and disassembly is extremely easy.
[0120]
In the recycled fuel assembly storage basket according to the next invention, the plate-like members are orthogonally stacked and stacked in multiple stages alternately, and further, the plate-like members are transmitted so as to straddle adjacent plate-like members. The claw of the heat plate was inserted into the opening of the through hole of the plate-like member, and the heat transfer plate was detachably attached. Thus, after the basket is assembled, it can be easily handled, and the basket can be easily inserted into the cask cavity. Further, since welding is not required for mounting the heat transfer plate, the basket can be easily assembled and disassembled is extremely easy.
[0121]
In the recycled fuel assembly storage basket according to the next invention, the plate-like members are alternately stacked in a plurality of stages so as to be orthogonal to each other, and the ribs provided inside the plate-like member and the claws of the heat transfer plate are used. In combination with the notch formed, the heat transfer plate was detachably attached to each stage. Thereby, since each stage of a basket can be assembled separately, the assembly of each stage can be advanced simultaneously and the productivity of a basket can be improved. Further, since the heat transfer plate is attached to the plate-like member, no basket is required, so that the basket can be manufactured efficiently. Furthermore, since the heat transfer plate is detachable, the basket can be disassembled very easily.
[0122]
Further, in the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, a convex portion and a concave portion are provided at both long side end portions of the plate-shaped member, respectively. The plate-like members were stacked in combination with the recesses. Thus, the basket can be assembled with high accuracy by preventing displacement when the plate-like members are combined. Further, when assembling the basket, the plate-like member can be easily positioned, so that the labor required for assembling the basket can be reduced.
[0123]
Further, in the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, the plate-like members stacked in a plurality of stages by the connecting member are connected to each other. It can be handled and handling after basket assembly becomes easy.
[0124]
Further, in the recycled fuel assembly storage basket according to the next invention, the heat transfer plate is fixed to the plate member by pressing the claw of the heat transfer plate inserted into the through hole of the plate member against the inner wall of the through hole. As a result, the plate-like member can be prevented from falling off. Further, since the plate member and the heat transfer plate are integrated by the fixing means, the basket has a stronger structure.
[0125]
In the basket for storing a recycled fuel assembly according to the next invention, a wedge-shaped member whose cross-sectional area decreases toward the opening of the through hole is used as the fixing means. As a result, the heat transfer plate is fixed to the plate member by moving the wedge-shaped member toward the opening of the through-hole and pressing the claw against the inner wall surface of the through-hole. The hot plate can be fixed to the plate and can be easily removed.
[0126]
Further, in the recycled fuel assembly storage basket according to the next invention, when the portion where the wedge-shaped member is in contact with the claw is divided by two slits and the heat transfer plate is fixed to the plate-shaped member, The portion delimited by the slit was in contact with the inner wall surface of the through hole. Thereby, since a nail | claw becomes easy to be pressed against the inner wall of a through-hole, a heat exchanger plate can be more reliably fixed to a plate-shaped member.
[0127]
Further, in the recycled fuel assembly storage basket according to the next invention, a taper is provided at a portion of the recycled fuel assembly storage basket where a wedge-shaped member as a fixing means contacts the claw. In this way, since a larger wedge-shaped member can be used, the heat transfer plate can be more securely fixed to the plate-shaped member by pressing the claws against the inner wall of the through hole with a larger area.
[0128]
Further, in the recycled fuel assembly storage basket according to the next invention, the heat transfer plate is fixed to the plate-like member by the elastic force of the claws provided on the heat transfer plate. The heat transfer plate can be fixed simply by being inserted into the through hole of the member. Thereby, the basket can be assembled more easily. Further, since it is not necessary to use a special member for fixing the heat transfer plate, the cost can be reduced accordingly.
[0129]
Moreover, in the basket for storing the recycled fuel assembly according to the next invention, the heat transfer plate is fixed to the plate member by pressing the convex portion provided on the claw against the inner wall of the through hole by the elastic force of the claw provided on the heat transfer plate. I tried to do it. For this reason, since a heat exchanger plate can be fixed only by inserting the nail | claw of a heat exchanger plate in the through-hole of a plate-shaped member, a basket can be assembled easily. Moreover, since a convex part contacts the inner wall of a through-hole, a heat exchanger plate can be fixed more reliably.
[0130]
Further, in the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, a recess is formed in the inner wall of the through hole with which the projection formed on the claw of the heat transfer plate abuts. As a result, when the heat transfer plate is attached to the plate-like member, the concave portion and the convex portion are engaged with each other so that the heat transfer plate is difficult to come off, so that the heat transfer plate can be more reliably prevented from falling off.
[0131]
In the recycled fuel assembly storage basket according to the next invention, the first plate members are combined so as to be orthogonal to each other, and the second plate member having a smaller dimension than the first plate member is used as the first plate member. Arranged between them. As a result, the notch can be easily processed, and the waste of material can be greatly reduced. In addition, since the second plate-like member can be manufactured only by cutting, it is possible to reduce the man-hours required for processing the elements constituting the basket. Furthermore, since the basket can be configured by stacking the first plate-like member and the second plate-like plate-like member side by side, the basket can be easily manufactured.
[0132]
Further, in the recycled fuel assembly storage basket according to the next invention, the first plate-like members stacked in a plurality of stages are integrated by the connecting member, so that the entire basket can be handled as a unit, A strong basket can be constructed. Accordingly, since the basket can be handled as one body without using a heat transfer plate, it is possible to easily work even when the basket is inserted into the cavity of the cask.
[0133]
In the recycled fuel assembly storage basket according to the following invention, in addition to the configuration of the recycled fuel assembly storage basket, a heat transfer plate is detachably attached to the outer periphery of the basket. For this reason, since a basket can be assembled easily, the effort and labor at the time of manufacturing a basket are reduced, and it can manufacture efficiently. In addition, since the heat transfer plate is detachably attached, disassembly is extremely easy, and it is suitable for reuse of the basket components.
[0134]
In the recycled fuel assembly storage basket according to the next invention, in addition to the configuration of the recycled fuel assembly storage basket, a first plate member adjacent in the stacking direction of the first and second plate members; The nail | claw of the heat exchanger plate was inserted in the opening part of the through-hole of a plate member so that a 2nd plate member might be straddled, and the heat exchanger plate was attached so that attachment or detachment was possible. Thereby, since the first and second plate-like members can be firmly fixed by the heat transfer plate, it can be handled easily after the basket is assembled. Further, since the heat transfer plate is detachably attached to the plate-like member, the basket can be easily assembled, and the disassembly of the basket is extremely easy, so that the basket components can be easily reused.
[0135]
Also, in the recycled fuel assembly storage basket according to the next invention, the heat transfer plate is attached to the first plate by the fastening means via the heat transfer plate fixing member engaged with the first plate member or the second plate member. Since it was made to fix to a shape member etc., a heat exchanger plate can be more reliably fixed to a 1st plate shape member etc.
[0136]
Moreover, in the basket for storing the recycle fuel assembly according to the next invention, the plate-like members are alternately stacked in a plurality of stages so as to be orthogonal to each other, and a heat transfer plate is detachably attached to the outer periphery thereof. For this reason, it is not necessary to weld the heat transfer plate to the plate-like member, so the labor and labor required for manufacturing the basket can be reduced, and the basket can be efficiently manufactured. Suitable for. In addition, since the heat transfer plate is detachably attached by bringing the inner sides of the claws provided on both sides of the heat transfer plate into contact with the plate member, it can be easily transferred even to a basket constituted by a solid plate member. A hot plate can be attached.
[0137]
In the recycled fuel assembly storage basket according to the next invention, a recess into which the claw of the heat transfer plate is fitted is provided in the vicinity of the short side end of the plate member. Thereby, since the nail | claw of a heat exchanger plate gets into a dent, it can prevent the drop of a heat exchanger plate more reliably.
[0138]
Further, in the recycled fuel assembly storage basket according to the next invention, the plate-like member is manufactured from the B-Al material in the recycled fuel assembly storage basket. For this reason, sufficient strength of the recycled fuel assembly storage basket can be ensured by the tough B-Al material while exhibiting sufficient neutron absorption capacity in the recycled fuel assembly storage basket.
[0139]
In the recycled fuel assembly storage basket according to the next invention, the B content of the B-Al material is set to 1.5 mass% or more and 7.0 mass% or less in the recycled fuel assembly storage basket. For this reason, sufficient toughness can be ensured while exhibiting sufficient neutron absorption capability in the recycled fuel assembly storage basket. Moreover, since B content is 7 mass% or less, an extrusion molding process can also be performed comparatively easily.
[0140]
Further, in the recycled fuel assembly storage basket according to the next invention, in the recycled fuel assembly storage basket, concentrated boron is added to the B-Al material as all or part of the boron content. For this reason, since the same neutron absorption ability can be obtained with a plate-like member or square pipe having a thinner plate thickness than when natural boron is used as it is, the recycled fuel assembly storage basket can be made lighter and more compact. . Natural boron and B_FourSince the neutron absorption capacity can be increased by adding the same amount of concentrated boron as when C is used as it is, sufficient safety against criticality can be ensured even when storing a highly burned recycled fuel assembly.
[0141]
Further, in the recycled fuel assembly storage container according to the next invention, the recycled fuel assembly storage basket is provided in the cavity, so that it can be easily manufactured and the manufacturing cost can be kept low.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a cask.
FIG. 2 is an explanatory diagram showing an outline of a canister.
FIG. 3 is an explanatory view showing a recycled fuel assembly storage basket according to Embodiment 1 of the present invention;
FIG. 4 is an explanatory view showing a recycled fuel assembly storage basket according to Embodiment 1 of the present invention;
FIG. 5 is an explanatory view showing a plate-like member constituting the recycled fuel assembly storage basket according to Embodiment 1 of the present invention.
FIG. 6 is an explanatory view showing a plate-like member constituting the recycled fuel assembly storage basket according to Embodiment 1 of the present invention.
FIG. 7 is an explanatory view showing a plate-like member constituting the recycled fuel assembly storage basket according to Embodiment 1 of the present invention.
FIG. 8 is an explanatory view showing a heat transfer plate according to Embodiment 1 of the present invention.
FIG. 9 is an explanatory view showing a heat transfer plate mounting structure according to Embodiment 1 of the present invention;
FIG. 10 is an explanatory diagram showing a heat transfer plate fixing structure according to Embodiment 1 of the present invention;
FIG. 11 is an explanatory diagram showing a heat transfer plate fixing structure according to Embodiment 1 of the present invention;
FIG. 12 is an explanatory diagram showing a heat transfer plate fixing structure according to Embodiment 1 of the present invention;
FIG. 13 is an explanatory diagram showing a heat transfer plate fixing structure according to Embodiment 1 of the present invention;
FIG. 14 is an explanatory diagram showing a heat transfer plate fixing structure according to Embodiment 1 of the present invention;
FIG. 15 is an explanatory view showing a basket according to Embodiment 2 of the present invention.
FIG. 16 is an explanatory view showing a plate member constituting a basket according to Embodiment 2 of the present invention.
FIG. 17 is an explanatory view showing another long plate-like member according to Embodiment 2 of the present invention and a basket using this long plate-like member.
FIG. 18 is an explanatory diagram showing a heat transfer plate fixing structure according to Embodiment 2 of the present invention;
FIG. 19 is an explanatory view showing a basket according to Embodiment 3 of the present invention.
FIG. 20 is an explanatory view showing a basket according to Embodiment 3 of the present invention.
FIG. 21 is an explanatory diagram showing another configuration example of the basket according to the third embodiment of the present invention.
FIG. 22 is an explanatory view showing a structure for preventing a heat transfer plate from falling off according to Embodiment 3 of the present invention;
FIG. 23 is a flowchart showing a method for manufacturing a plate member according to the present invention.
[Explanation of symbols]
10, 11, 11 ', 12, 12' Recycled fuel assembly storage basket (basket)
200 cask
201, 201 'trunk body
307, 507 cells
310, 635 Plate-shaped member
310st short side edge
310lt Long side edge
311 Through hole
318, 318 ', 319, 319', 320 Heat transfer plate
318c, 319c, 320c claw
510L Long plate member
510S Short plate member
566 Heat Transfer Plate Fixing Member
635u, 635u 'hollow

Claims (23)

A plate-like member in which a through-hole penetrating in the longitudinal direction opens at both short-side end portions, and a plurality of cut portions are formed at the long-side end portions;
A heat transfer plate having a substantially U-shaped cross section having claws detachably inserted into the opening of the through hole on both sides;
A plurality of cells for storing the recycle fuel assemblies are formed by stacking the plate-like members in a plurality of stages by causing the long-side ends of the plate-like members to be orthogonal to each other and engaging the notches. The claws on both sides of the heat transfer plate are inserted into the openings of the plate member adjacent to each other in the direction orthogonal to the stacking direction of the plate members, and the heat transfer plate is connected to the short side end of the plate member. Recycled fuel assembly storage basket, characterized by being attached to the part. A plate-like member in which a through-hole penetrating in the longitudinal direction opens at both short-side end portions, and a plurality of cut portions are formed at the long-side end portions;
A heat transfer plate having a substantially U-shaped cross-section, which is detachably inserted into the opening of the through-hole and has claws formed with notches in at least a part on both sides,
Forming a plurality of cells containing the recycled fuel assemblies by stacking the plate-like members in a plurality of stages by making the long-side end portions of the plate-like members orthogonal to each other and engaging the notches. The claw of the heat transfer plate is inserted into the opening of the plate member so that the notch of the claw straddles the plate member adjacent in the stacking direction of the plate member, and the heat transfer plate is A basket for storing a recycled fuel assembly, wherein the basket is attached to an end portion on a short side of a plate-like member. A plurality of through holes penetrating in the longitudinal direction are opened at both short side end portions, and a portion partitioned by the plurality of through holes forms a rib, and a plurality of cut portions are formed at the long side end portions. A plate-like member formed with,
A heat transfer plate having a substantially U-shaped cross-section, which is detachably inserted into the opening of the through-hole and has claws formed with notches in at least a part on both sides,
A plurality of cells for storing the recycle fuel assemblies are formed by stacking the plate-like members in a plurality of stages by causing the long-side ends of the plate-like members to be orthogonal to each other and engaging the notches. The heat transfer plate is attached to the short side end of the plate member by inserting the claw into the opening of the plate member so that the rib and the notch of the claw are combined. Recycled fuel assembly storage basket.   Furthermore, a convex part and a recessed part are provided in the both long side edge part of the said plate-shaped member, respectively, The said plate-shaped member is piled up combining this convex part and a recessed part, It is characterized by the above-mentioned. The basket for storing a recycled fuel assembly according to any one of?   Further, the plate-like member is provided with a communication hole penetrating the plate-like member in the short side direction, and the plate-like members stacked in a plurality of stages are connected by passing the connection member through the communication hole. The recycled fuel assembly storage basket according to any one of claims 1 to 4, wherein:   The said nail | claw inserted in the said through-hole is pressed by the fixing means pressed against the inner wall face side of the said through-hole, The said heat exchanger plate is fixed to the said plate-shaped member, The any one of Claims 1-5 characterized by the above-mentioned. The recycled fuel assembly storage basket according to item 1.   The fixing means is a wedge-shaped member having a cross-sectional area that decreases toward the opening of the through-hole. When the heat transfer plate is fixed to the plate-shaped member, the wedge-shaped member is opened to the through-hole. The recycle fuel assembly storage basket according to claim 6, wherein the basket is moved to a portion side and the claw is pressed against the inner wall surface side of the through hole. The portion of the claw where the wedge-shaped member comes into contact is separated by two slits, and when the heat transfer plate is fixed to the plate-shaped member, the portion separated by the slit is the inside of the through hole. The recycled fuel assembly storage basket according to claim 7, wherein the basket is in contact with a wall surface. 9. The recycled fuel assembly storage basket according to claim 7, wherein a taper is provided at a portion of the claw where the wedge-shaped member contacts.   When the heat transfer plate is attached to the plate member, the inside of the claw contacts the inner wall of a through hole provided in the plate member, and the heat transfer plate is fixed to the plate member by the elastic force of the claw. The recycled fuel assembly storage basket according to any one of claims 1 to 5, wherein the basket is stored.   The claw has a convex portion protruding toward the inside of the claw, and when the heat transfer plate is attached to the plate member, the convex portion is in contact with an inner wall of a through hole provided in the plate member, The recycled fuel assembly storage basket according to any one of claims 1 to 5, wherein the heat transfer plate is fixed to the plate member by the elastic force of the claw.   Furthermore, a concave portion is formed in the inner wall of the through hole with which the convex portion abuts, and the concave portion and the convex portion are engaged when the heat transfer plate is attached to the plate member. The recycled fuel assembly storage basket according to claim 11. A first plate-like member in which a through-hole penetrating in the longitudinal direction opens at both short-side end portions, and a plurality of notches are formed at either one of the long-side end portions;
A second plate-like member having through holes open at both ends, and the length in the direction in which the through holes pass is approximately the same size as the inner side of the cell containing the recycled fuel assembly;
A heat transfer plate having a substantially U-shaped cross section having claws detachably inserted into the opening of the through hole on both sides;
The first plate-like members are stacked in a plurality of stages by causing the long-side ends of the first plate-like members to be orthogonal to each other and engaging the notches with one of the long-side ends. The second plate member is disposed between the first plate members adjacent to each other in the stacking direction of the one plate member to form a plurality of cells for storing the recycled fuel assemblies, and the first plate member Claws on both sides of the heat transfer plate are respectively inserted into the openings of the first plate member or the second plate member adjacent to each other in a direction orthogonal to the stacking direction, and the heat transfer plate is the first plate shape. A recycled fuel assembly storage basket attached to a member or the second plate member .   Further, the first plate member is provided with a communication hole penetrating the first plate member in the short side direction, and the first plate stacked in a plurality of stages by allowing the connection member to pass through the communication hole. The recycled fuel assembly storage basket according to claim 13, wherein the shaped members are connected to each other. Furthermore, the heat transfer plate having a substantially U-shaped cross section having a claw that is detachably inserted into the opening of the through hole and has at least part of a notch formed on both sides,
The claw of the heat transfer plate so that the notch of the claw straddles the first plate member and the second plate member adjacent to each other in the stacking direction of the first plate member and the second plate member. The basket for storing a recycle fuel assembly according to claim 13 or 14, wherein the heat transfer plate is attached to the first plate member and the second plate member by inserting the heat transfer plate into the opening. Furthermore, claims, characterized in that with the first plate-shaped member or the second plate-like member and the heat transfer plate fixing member engaged, fixing the heat transfer plate to the heat transfer plate fixing member by a fastening means Item 16. The recycled fuel assembly storage basket according to any one of Items 13 to 15 . A plate-like member in which a plurality of cut portions are formed at the end on the long side,
A heat transfer plate having a substantially U-shaped cross section having claws on both sides sandwiching a short side end of the adjacent plate member;
Forming a plurality of cells containing the recycle fuel assemblies by stacking the plate-like members in a plurality of stages by making the long-side end portions of the plate-like members orthogonal to each other and engaging the notches. ,
The heat transfer plate is passed between the short-side ends of the plate members adjacent to each other in a direction orthogonal to the stacking direction of the plate members, and the inside of the claw provided on both sides of the heat transfer plate is A recycled fuel assembly storage basket, wherein a plurality of the heat transfer plates are attached to an end portion on a short side of the plate-like member in contact with an outer surface of the plate-like member. The recycled fuel assembly storage basket according to claim 17 , wherein a recess into which a claw of the heat transfer plate is fitted is formed in the vicinity of the short side end of the plate member. . The recycled fuel assembly storage basket according to any one of claims 1 to 12, wherein the plate-like member is a B-Al material. Upper Symbol first plate-shaped member, the second plate member recycled fuel assembly storage basket according to any one of claims 1 3-18, characterized in that the B-Al material. The recycled fuel assembly storage basket according to claim 19 or 20, wherein the B content of the B-Al material is 1.5 mass% or more and 7.0 mass% or less. Recycled fuel assembly according to claim 20 or 21 in the B-Al material, characterized in that the concentration of boron was concentrated B ¹⁰ having a neutron absorption ability as all or part of the boron content is added Storage basket.   The recycled fuel assembly storage basket is inserted by aligning the inner shape of the cavity of the recycled fuel assembly storage container body with the outer shape of the recycled fuel assembly storage basket according to any one of claims 1 to 22. A recycled fuel assembly storage container, wherein the recycled fuel assembly is stored in the cell.

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