JP2001201595A - Basket and cask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of a basket in the insertion of a nuclear fuel assembly, surely prevent the positional slippage between plate members in the constitution of the basket by assembling the plate members in a grating shape, and enhance the strength of the basket and also the heat conductive property to the outside. SOLUTION: Plate members 40c-40f comprises a plurality of cutout parts 44a-44d to be mutually orthogonally engaged on both long edge-side end surfaces and protruding parts 33 on the longitudinal centers on both short edge-side end surfaces, respectively. The plate members 40c-40f having longitudinal through-holes extending through both the sort edge-side end surfaces are successively orthogonally combined to each other, and a heat exchanger plate is fitted between the adjacent protruding parts 33 to form a grating cell for housing a nuclear fuel assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-like member for assembling a basket constituting a cask for containing, transporting and storing spent nuclear fuel assemblies, a basket using the same, and a cask using the same. In particular, pressurized water reactor (PWR)
The present invention relates to a plate-like member for basket assembly, a basket and a cask for r).

[0002]

2. Description of the Related Art A nuclear fuel assembly that has been burned at the end of a nuclear fuel cycle and has become unusable is called spent nuclear fuel. Since spent nuclear fuel contains high-activity materials such as FP, it needs to be thermally cooled. Therefore, the spent nuclear fuel is cooled in a cooling pit of a nuclear power plant for a predetermined period. After that, it is stored in a cask, which is a shielding container, and transported and stored in a reprocessing facility by a truck or a ship. In storing the spent nuclear fuel assembly in the cask, a holding element having a lattice cross section called a basket is used. The spent nuclear fuel assemblies are inserted one by one into cells, which are a plurality of storage spaces formed in the basket, thereby ensuring an appropriate holding force against vibration during transportation.

[0003] As a conventional example of such a cask,
Various types are disclosed in "Atomic energy eye" (published on April 1, 1998: Nikkan Kogyo Shuppan Production), Japanese Patent Application Laid-Open No. 62-242725, and the like. In addition,
Light water nuclear power generation includes boiling water nuclear power generation (BWR:
boiling water reactor) and pressurized water nuclear power (P
WR: pressurized water reactor).

FIG. 10 is a perspective view showing an example of a cask. FIG. 11 is an axial sectional view of the cask shown in FIG. The cask 100 has a cylindrical body 101.
And a resin 102 serving as a neutron shield provided on the outer periphery of the trunk main body 101, and an outer cylinder 103, a bottom 104 and a lid 105. Body 101 and bottom 1
04 is a forged product made of carbon steel which is a γ-ray shield. Further, the lid 105 includes a primary lid 106 and a secondary lid 107 made of stainless steel or the like. Body 101 and bottom 104
Are joined by butt welding. Primary lid 10
6 and the secondary lid 107 are fixed to the body 101 by bolts made of stainless steel or the like. Lid 105
An O-ring made of metal is interposed between the body and the body 101 to maintain the airtightness inside.

A plurality of internal fins 108 for conducting heat are provided between the body 101 and the outer cylinder 103.
Copper is used as the material of the internal fins 108 in order to increase the heat conduction efficiency. The resin 102 has the internal fin 1
08 is injected in a fluidized state into a space formed by solidification by a thermosetting reaction or the like. Basket 109 is 69
As shown in FIG. 11, the rectangular pipes 110 are assembled in a bundle, and are inserted into the cavity 111 of the body 101 in a restricted state.

[0006] The square pipe 110 is made of an aluminum alloy mixed with a neutron absorbing material (boron: B) so that the inserted spent fuel assembly does not reach the criticality. In addition,
On both sides of the cask main body 112, trunnions 113 for suspending the cask 100 are provided (only one is shown). At both ends of the cask main body 112, a buffer 1 having wood or the like incorporated therein as a buffer is provided.
14 (only one is shown). Note that 11
Reference numeral 5 denotes a cell in which a spent nuclear fuel assembly is stored.

By the way, light water nuclear power generation includes boiling water nuclear power generation (BWR).
Pressurized water nuclear power generation (PWR)
tor). The above-described cask 100 is a cask that stores a spent nuclear fuel assembly used for boiling water nuclear power generation (BWR: boiling water reactor).
The nuclear fuel assembly for BWR has a configuration shown in FIG.

FIG. 12 is an axial sectional view of a PWR cask. In FIG. 12, a cask 20 for PWR
In the cavity 111 having a rectangular cross section, plates 217 extending in the radial direction are alternately combined.
5 having a basket 209. Each plate 2
07 is made of an aluminum alloy mixed with B, which is a neutron absorber, like the square pipe 110 for BWR. However, each plate 217 has a through-hole of a cooling water channel 216 extending in the axial direction, a so-called water zone, and fills each basket 209 with water during cooling of the spent nuclear fuel assembly to decelerate neutrons. Neutron absorption by the plate 217 and the resin 102 is performed efficiently. The water filled in each basket 209 and the cooling water flow path 216 is drained and dried after a predetermined cooling period has elapsed.

The provision of the cooling water flow path 216 is because the uranium enrichment of the nuclear fuel assembly for PWR is higher than that of the nuclear fuel assembly for BWR, and the uranium loading amount of the nuclear fuel assembly for PWR is also high. In many cases, since the cross-sectional area of the nuclear fuel assembly is large, the reactivity of the system in which the nuclear fuel assemblies are arranged increases. Here, the distance dd shown in FIG. 12 is a distance that ensures that the spent nuclear fuel assembly becomes subcritical, and the distance dd for PWR needs to have a larger distance than the distance for BWR. There is. Also, the arrangement of the cells 215 is not lattice-shaped and is displaced.
This is because the PWR spent nuclear fuel assembly having a larger sectional area than the spent nuclear fuel assembly described above is efficiently disposed in the cavity 111.

FIG. 13 is a partially assembled perspective view of another basket used in a PWR cask. This PWR
Some casks use an H-shaped plate having a notch 302 and form a basket by combining the notches 302 vertically and horizontally.
In this case, the channel 303 is filled with water as a neutron moderator when the spent nuclear fuel assembly is cooled.

FIG. 14 is a partially assembled perspective view of another basket used in a PWR cask. The basket shown in FIG. 14 is assembled by engaging with the notch 402 of the H-shaped plate 401, but only by engaging the notch 402, the basket with the H-shaped plates located at the upper and lower portions of each H-shaped plate is assembled. Since the position shift occurs and the strength is weak, the support rod 40 penetrating through each engagement portion is formed.
4 to prevent the displacement of all the H-shaped plates 401 from occurring.

[0012]

However, even if the support rods 404 are used, each H-shaped plate 401 will
Since it is conceivable that the H-shaped plate 4 rotates about the fulcrum, the displacement between the H-shaped plates cannot be surely eliminated, the strength of the basket is impaired, and the basket is damaged when the spent nuclear fuel assembly is inserted. There was a problem that it would.

The end of the H-shaped plate is joined to the inner wall surface of the cabinet. However, since the contact area is small, the heat in the basket is not well conducted to the outside, and the subcriticality is ensured by the temperature rise. There was also a problem that it was not possible.

Incidentally, the H constituting the basket for the PWR
Since the mold plate needs to form a flow path to fill the water, the notch for combining in a grid shape
Although it has a certain thickness, it can eliminate the displacement of the H-shaped plate and can have a certain strength, but it is a reality that even higher strength is required.

The present invention has been made in view of the above,
When the basket is constructed by assembling the plate members in a lattice shape, it is possible to eliminate damage to the basket at the time of inserting the nuclear fuel assembly, to surely eliminate displacement between the plate members, and to increase the strength of the basket. It is another object of the present invention to provide a basket assembling plate member, a basket, and a cask that can increase the heat conductivity to the outside of the basket.

[0016]

In order to achieve the above object, a basket according to claim 1 has a neutron shield on the outer periphery and a plate-like member in a cavity of a trunk body for shielding γ rays. In a basket for storing a nuclear fuel assembly by using a plurality of cutouts which are orthogonally engaged with each other on both long side end faces of the plate-shaped member, and are protruded in the longitudinal direction of the central portion of both short side end faces. And a lattice-like shape in which the plate-shaped members are sequentially orthogonally engaged with each other by engaging the notches, and a heat transfer plate is externally fitted between the adjacent protrusions to accommodate the nuclear fuel assembly. A cell is formed.

According to the present invention, a plurality of cutouts are provided on both long side end faces of the plate-like member forming the basket so as to engage with each other at right angles to each other, and are protruded in the longitudinal direction of the central portion of both short side end faces. And a lattice-like shape in which the plate-shaped members are sequentially orthogonally engaged with each other by engaging the notches, and a heat transfer plate is externally fitted between the adjacent protrusions to accommodate the nuclear fuel assembly. A cell is formed.

A basket according to a second aspect of the present invention is a basket having a neutron shield on the outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk body for shielding γ rays. A plurality of cutouts are provided on both long side end surfaces of the plate-shaped member to engage at right angles to each other,
In addition to providing a convex portion in the central portion longitudinal direction of both short side end surfaces, the notch is formed by sequentially cutting the plate members having a longitudinal through hole penetrating both short side end surfaces of the plate member so as to be orthogonal to each other. The lattice-shaped cells for housing the nuclear fuel assemblies are formed by engaging and combining the portions, and externally fitting a heat transfer plate between the adjacent convex portions.

According to the present invention, a plurality of notches are provided on both long side end faces of the plate-like member forming the basket so as to be engaged with each other at right angles to each other, and are protruded in the longitudinal direction of the central part of both short side end faces. Along with the portion, the plate-shaped members having a longitudinal through-hole penetrating both short side end faces of the plate-shaped member are combined by sequentially engaging the cutout portions orthogonally to each other,
A heat transfer plate is externally fitted between the adjacent convex portions to form a grid-like cell for storing the nuclear fuel assembly.

A basket according to a third aspect of the present invention is a basket having a neutron shield on the outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk body for shielding γ rays. A plurality of cutouts are provided on both long side end surfaces of the plate-shaped member to engage at right angles to each other,
A convex portion is formed in a portion other than the cutout portion of one long side end surface of the plate-shaped member, and a concave portion is formed in a portion other than the cutout portion of the other long side end surface so as to fit in correspondence with the convex portion, The plate-shaped member is provided with a convex portion in the longitudinal direction at the center of both short side end surfaces, and the plate-shaped members having the longitudinal through holes penetrating both the short side end surfaces are cut out at right angles to each other sequentially. The heat transfer plates are externally fitted between the adjacent convex portions of the two short side end faces to form lattice cells for accommodating the nuclear fuel assemblies.

According to the present invention, a plurality of notches are provided on both long side end surfaces of the plate member forming the basket so as to engage with each other at right angles to each other, and the notch on one long side end surface of the plate member is provided. A convex portion is formed in a portion other than the portion, a concave portion that fits in correspondence with the convex portion is formed in a portion other than the cutout portion of the other long side end surface, and a central portion length of both short side end surfaces of the plate-shaped member is formed. Along with providing the convex portion in the hand direction, the plate-shaped members having the longitudinal through holes penetrating both short side end surfaces are sequentially orthogonally engaged with each other by engaging the notch portions, and combining the adjacent two A heat transfer plate is externally fitted between the convex portions of the short side end faces to form a lattice-like cell for storing the nuclear fuel assembly.

According to a fourth aspect of the present invention, in the above-mentioned invention, the edges of both long side end faces of the plate-like member are chamfered.

According to the present invention, the edges of both long side end faces of the plate-like member forming the basket are chamfered.

According to a fifth aspect of the present invention, in the above invention, at least a plurality of through-holes of the plate-like member have a substantially rectangular cross section.

According to the present invention, at least a plurality of through holes having a substantially rectangular cross section are provided in the plate-like member forming the basket.

According to a sixth aspect of the present invention, in the above invention, the concave and convex portions of the plate-like member are
It is characterized in that it is a partial concave portion and convex portion on the long side end surface.

According to the present invention, partial recesses and projections are formed on the long side end surface of the plate-like member forming the basket, so that positional displacement in all directions on the plate-like member contact surface after the basket is assembled. I'm trying to get rid of it.

According to a seventh aspect of the present invention, in the basket as described above, the plate-like member is made of an Al composite material or an Al alloy obtained by adding a B or B compound powder having a neutron absorbing property to an Al or Al alloy powder. It is characterized by comprising.

According to the present invention, the plate-like member forming the basket is made of an Al composite material or an Al alloy obtained by adding a B or B compound powder having a neutron absorbing property to an Al or Al alloy powder. I have.

The cask according to claim 8 is provided with a plurality of notches which are orthogonally engaged with each other on both long side end faces of the plate-like member, and are protruded in the longitudinal direction of the central portion of both short side end faces. A lattice-shaped cell for storing the nuclear fuel assembly by fitting the plate-shaped members sequentially orthogonally to each other by engaging the cutouts, and externally fitting a heat transfer plate between the adjacent protrusions. A basket having the basket therein, a neutron shield on the outer periphery, a trunk body for shielding γ-rays, and the trunk for taking the nuclear fuel assembly into and out of the lattice-shaped cells. And a detachable lid provided in the opening of the main body.

According to the present invention, a plurality of notches are provided on both long side end faces of the plate-like member forming the basket of the cask so as to engage with each other at right angles to each other, and both short side end faces have a central longitudinal direction. And a lattice that accommodates the nuclear fuel assembly by fitting the plate-shaped members sequentially orthogonally to each other by engaging the notches and engaging a heat transfer plate between the adjacent protrusions. It has a basket structure in which shape cells are formed.

According to a ninth aspect of the present invention, in the cask, a plurality of cutouts are provided on both long side end faces of the plate member so as to engage with each other at right angles to each other, and are protruded in the longitudinal direction of the center of both short side end faces. The plate-shaped members having longitudinal through holes penetrating both short side end surfaces of the plate-shaped member are sequentially combined with each other by engaging the notch portions at right angles to each other, and the adjacent protrusions are provided. A basket in which a heat transfer plate is externally fitted between the parts to form a lattice-like cell for storing a nuclear fuel assembly, a basket containing the basket therein, a neutron shield on the outer periphery, and γ
A trunk body for shielding a wire, and a detachable lid provided at an opening of the trunk body for taking the nuclear fuel assembly into and out of the lattice-shaped cells are provided.

According to the present invention, a plurality of notches are provided on both long side end faces of the plate-like member forming the basket of the cask so as to engage with each other at right angles to each other, and both short side end faces have a central longitudinal direction. Are provided, and the plate members having longitudinal through holes penetrating both short side end faces of the plate member are sequentially orthogonally combined with each other by engaging the notches, and being adjacent to each other. A basket structure is provided in which a heat transfer plate is externally fitted between the protrusions to form a grid-like cell for storing a nuclear fuel assembly.

According to a tenth aspect of the present invention, there is provided a cask, wherein a plurality of cutouts are provided on both long side end surfaces of the plate member so as to be engaged with each other at right angles to each other. A convex portion is formed in a portion other than the portion, a concave portion that fits in correspondence with the convex portion is formed in a portion other than the cutout portion of the other long side end surface, and a central portion length of both short side end surfaces of the plate-shaped member is formed. Along with providing the convex portion in the hand direction, the plate-shaped members having the longitudinal through holes penetrating both short side end surfaces are sequentially orthogonally engaged with each other by engaging the notch portions, and combining the adjacent two A basket in which a heat transfer plate is externally fitted between the convex portions of the short side end faces to form a lattice-like cell for storing the nuclear fuel assembly, a basket containing the basket therein, a neutron shield on the outer periphery, and γ A trunk body for shielding a wire, and the nuclear fuel assembly is moved into and out of the lattice-shaped cells. And removable cover portion provided in the opening of the cylinder body in order, characterized by comprising a.

According to the present invention, a plurality of cutouts are provided on both long side end surfaces of the plate member forming the basket of the cask so as to engage with each other at right angles to each other. A convex portion is formed in a portion other than the notch portion, and a concave portion that fits in correspondence with the convex portion is formed in a portion other than the notch portion of the other long side end surface, and both short side end surfaces of the plate-shaped member are formed. Along with providing a convex portion in the longitudinal direction of the central portion, the plate-like members having the longitudinal through holes penetrating both short side end surfaces are sequentially orthogonally combined with each other by engaging the cutout portions and adjoining. A basket structure is formed in which a heat transfer plate is externally fitted between the convex portions on both short side end faces to form a lattice-like cell for storing a nuclear fuel assembly.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the basket inserting method according to the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited by the embodiment.

(Embodiment 1) First, a cask to which the present invention is applied will be described. FIG. 1 is an axial sectional view of a cask to which the present invention is applied. FIG. 2 shows FIG.
FIG. 2 is a radial sectional view of the cask shown in FIG. Cask 1
Is obtained by machining the inner surface of the cavity 3 of the trunk body 2 according to the outer peripheral shape of the basket 30. The machining of the inner surface of the cavity 3 is performed by milling or the like using a dedicated processing device. The basket 30 and a part of the inner surface of the cavity 3 are connected via a heat transfer plate 32. The heat transfer plate 32 is made of a material having good heat conductivity such as Al.
The trunk body 2 and the bottom plate 4 are forged products made of carbon steel having a γ-ray shielding function. Note that stainless steel can be used instead of carbon steel. The body 2 and the bottom plate 4 are joined by welding. In addition, a metal gasket is provided between the primary lid 10 and the body 2 in order to secure the sealing performance as a pressure-resistant container.

The space between the trunk body 2 and the outer cylinder 5 is filled with a resin 6 which is a polymer material containing a large amount of hydrogen and has a neutron shielding function. A plurality of copper heat transfer fins 7 for conducting heat are welded between the body 2 and the outer cylinder 5, and the resin 6 flows in a space formed by the heat transfer fins 7. Injected and cooled and solidified. It is preferable that the heat transfer fins 7 be provided at a high density in a portion having a large amount of heat in order to uniformly radiate heat. A thermal expansion margin 8 of several mm is provided between the resin 6 and the outer cylinder 5.

The lid 9 is composed of a primary lid 10 and a secondary lid 11. The primary lid 10 has a disk shape made of stainless steel or carbon steel that shields γ rays. The secondary lid 11 is also a disk made of stainless steel or carbon steel, and has a resin 12 as a neutron shield on its upper surface.
Is enclosed. The primary lid 10 and the secondary lid 11 are attached to the body 2 with bolts 13 made of stainless steel or carbon steel. Further, metal gaskets are provided between the primary lid 10 and the secondary lid 11 and the body 2 to maintain the internal sealing. Also,
Around the lid 9, an auxiliary shielding body 1 in which a resin 14 is sealed
5 are provided.

The cask 1 is provided on both sides of the cask body 16.
A trunnion 17 is provided for suspending the trunnion.
Although FIG. 1 shows the case where the auxiliary shield 115 is provided, when the cask 1 is transported, the auxiliary shield 15 is removed and a buffer (not shown) is attached.

The basket 30 is formed by alternately assembling plate-like members 40 constituting the cells 31 for storing the spent nuclear fuel assemblies in a vertical and horizontal manner. 32. As the plate-like member 40, an aluminum composite material or an aluminum alloy obtained by adding B or a B compound powder having a neutron absorption performance to Al or an Al alloy powder is used. In addition, cadmium can be used as the neutron absorber in addition to boron. Further, a member obtained by adding B or a B compound having the above-described neutron absorbing ability to a stainless steel material or the like without being limited to aluminum may be used.

FIG. 3 is a view showing a configuration of a plate-like member 40a which is one of the plate-like members 40. FIG. 3 (a) shows a front view of the plate-like member 40a, and FIG. Is a plate-like member 40
3A is a plan view, and FIG. 3C is a right side view of the plate member 40a. In FIG. 3, the plate member 40a
Has through-holes 41 and 42, which penetrate in the longitudinal direction through both short side end faces and have a rectangular cross-sectional shape. In addition, the plate-shaped member 40a has notches 44 from both long side end surfaces at equal intervals along the longitudinal direction. The depth of the notch 44 is １ ／ of the width of the plate member 44. In addition, convex portions 33 and 34 extend in the longitudinal direction of the central portion of both short side end surfaces of the plate member 40a.
Having. The convex portions 33 and 34 form a concave portion at the corner of both short side end surfaces, and the adjacent convex portion 33 or convex portion 34 is formed.
The heat transfer plate 32 is fitted between them. The thickness of the projections 33 and 34 is the same as the thickness of the heat transfer plate 32, and the engagement surfaces are formed to have a shape corresponding to the difference.

The plate-like member 40a has a notch 44
Through both long side end surfaces to form through holes 41 and 42.
And a communication hole 43 that communicates the upper or lower through hole combined in a grid pattern. These through holes 41 and 42 and the communication hole 43 are filled with water during the cooling period in the cooling pool, and the neutrons from the spent nuclear fuel assemblies accommodated in the cell 31 are decelerated, and the plate member 40a or the resin Promote neutron absorption by 6,12,14. To have such a water channel,
This is the case of a cask for PWR, because the uranium enrichment of the spent fuel assembly for PWR is high and subcriticality is ensured.

The plate member 40a is provided with a concave portion 45 on the upper long side end surface, and a convex portion 46 having a shape in which the concave portion 45 is fitted on the lower long side end surface. The concave portion 45 and the convex portion 46 are fitted to upper and lower plate-like members at the time of assembling, which will be described later, so that positional displacement between the plate-like members can be eliminated.

FIG. 4 is a view showing the configuration of a plate member 40b which is one of the plate members 40. FIG. 4 (a) shows a front view of the plate member 40b, and FIG. Is a plate-like member 40
4B shows a plan view, and FIG. 4C shows a right side view of the plate member 40b. The plate member 40b in FIG. 4 has a shape in which both short side end surfaces are inclined, which is different from the plate member 40a shown in FIG. This is in accordance with the shape of the cavity 3. Further, the plate-like member 4
Ob forms convex portions 35 and 36 in the longitudinal direction of both short side end surfaces. One surface of the projections 35 and 36 forms a slope corresponding to the above-described cavity inner wall shape, and the other surface forms the heat transfer plate 3.
2 is formed with a concave slope which can be fitted outside. Other configurations are
This is the same as the plate member 40a shown in FIG. The other plate members 40 are different from the plate members 40a and 40b shown in FIGS. 3 and 4 only in length, and the other configurations are the plate members 40a and 40a shown in FIGS. It has the same configuration as 40b.

Next, the assembly of the basket 30 by the plate-like member 40 will be described with reference to FIG. FIG. 5 is a partially assembled perspective view of the basket 30. In FIG.
The plate members 40d and 40e are arranged in parallel at intervals corresponding to the equal intervals of the notches. The plate-like member 40d,
A plate-like member 40c and a plate-like member 40f whose longitudinal directions are orthogonal to each other are disposed in the upper and lower portions of the plate-like member 40e, respectively.
The notches on the upper portions of the plate members 40d and 40e are engaged with each other so that the notch portions on the lower portions of the plate members 40d and 40e
The notch at the top of 0f is engaged with each other.

For example, the notch 4 of the plate member 40c
4a and the notch 44b of the plate member 40e are engaged, and the notch 44c of the plate member 40e is
f is engaged with the notch 44d. Similarly, the lattice-shaped basket 30 can be formed by alternately engaging the other plate-shaped members 40 vertically and horizontally via the cutouts 44.

In this case, when the plate members 40 are combined, the upper concave portion 45 and the lower convex portion 46 are fitted with each other, resulting in a displacement between the plate members 40, for example, the plate members 40c and 40f.
The positional deviation between them can be eliminated. FIG. 6 is a view showing a cross section of the basket 30 in an assembled state. As shown in FIG. 6, the protrusion 4 provided at the lower part of the plate-like member 40c is provided.
6 and the concave portion 45 provided on the upper part of the plate-like member 40f are fitted to each other to eliminate a displacement in a direction perpendicular to the longitudinal direction, to prevent the wall shape of the cell 31 from becoming uneven, and to use the spent nuclear fuel assembly. The body can be inserted smoothly. The communication holes 43 of the plate members 40 located above and below are connected by the combination of the plate members 40.

FIG. 7 is a diagram showing an engagement relationship between the plate members 40d and 40e and the heat transfer plates 32a and 32b. In FIG. 7, the thickness of the heat transfer plates 32a and 32b is
It is the same as the thickness of d and 33e. Further, the heat transfer plates 32a,
The width of 32b is equal to a value obtained by adding the width of the concave portion on each short side end face formed by the convex portions 33d, 33e to the interval between the plate members 40e, 40d. Further, the heat transfer plates 32a, 32b
Is equal to the height of the plate members 40d and 40e. When the heat transfer plates 32a and 32b are externally fitted to the plate members 40d and 40e, the heat transfer plates 32a and 32b are engaged with each other at a position where the plate members 40d and 40e are bisected (FIG. 7). 32a ', 32b'). In the first embodiment, the basket is easily assembled by stacking a plurality of heat transfer plates 32a and 32b in the height direction of the basket, but the height direction is set to one heat transfer plate. It may be configured.

According to the first embodiment, when a PWR basket requiring a water flow path is formed of a plate-like member, through holes 41 and 42 are provided in each plate-like member 40 to provide a sufficient flow. A passage is provided, and each through hole 4 is formed by the communication hole 43.
1 and 42 are communicated with each other, so that the strength can be increased as compared with the H-shaped plate. In addition, the displacement between the plate members 40 is eliminated by engagement of the concave portions 45 and the convex portions 46. Thus, the shape of the cell 31 can be accurately maintained in a prismatic shape. Further, in the first embodiment described above, the heat transfer plate 32 is externally fitted to the plate-shaped member 40, and the heat conductivity of the plate-shaped member 40 to the outside of the cabinet via the heat transfer plate 32 is improved.

(Embodiment 2) Next, Embodiment 2 will be described. In the above-described first embodiment, two through holes 41 and 42 are provided in each plate-shaped member 40. In the second embodiment, three through holes are provided.

FIG. 8 shows a basket 3 according to the second embodiment.
0 is a partially assembled perspective view. In FIG. 8, each plate-shaped member 50 has three through-holes 51 to 53, and serves as a water flow path. Further, at both short side ends of the plate-shaped member, convex portions 54 are formed in the longitudinal direction, so that the heat transfer plate 32 can be fitted to the outside. Other configurations are the same as those of the plate member 40 in the first embodiment.

According to the second embodiment, the first embodiment
In addition to the function and effect described above, the strength of each plate member 50 can be further increased. The same operation and effect can be obtained even when four or more through holes are provided in each plate member 50.

(Third Embodiment) Next, a third embodiment will be described. In the first and second embodiments described above, the linear concave portions 45 are provided on the upper end surfaces of the plate members 40 and 50, and the linear convex portions 46 are provided on the lower end surfaces.
At the time of assembling 0 and 50, the corresponding concave portions 45 and convex portions 46 are engaged with each other, but in the third embodiment,
Partial recesses are provided in the upper end surfaces of the plate members 40 and 50,
A partial convex portion is provided at a position corresponding to the concave portion, and the concave portion and the convex portion are fitted when the plate members 40 and 50 are assembled.

FIG. 9 shows a basket 3 according to the third embodiment.
0 is a partially assembled perspective view. In FIG. 9, each of the plate members 60c to 60f has a partial recess 6
1 and 63, and the recess 61,
Protrusion portions 62 and 64 having a projection shape to be fitted to 63 are provided. Further, the plate-like members 60c to 60f form the convex portions 65 in the longitudinal direction of both short side end surfaces, so that the heat transfer plate 32 can be fitted to the outside.

When the basket 30 is assembled, the concave portions 61 and 63 and the convex portions 62 and 64 are fitted. For example,
In FIG. 8, the convex portion 62 of the plate-shaped member 60c is fitted into the concave portion 63 of the plate-shaped member 60f, and the positional displacement between the plate-shaped members 60c, 60f can be eliminated.

According to the third embodiment, the basket 3
By assembling the partial concave portions 61, 63 between the plate members and the partial convex portions 62, 64 between the plate members at the time of assembling, the positional deviation between the plate members is eliminated as in the first and second embodiments. In addition to this, it is possible to further eliminate the displacement of the plate-shaped member in the longitudinal direction, and it is possible to more accurately hold the shape of the cell 31 in a prismatic shape.

In the first to third embodiments, the edges of both long side edges of the plate-shaped member 40 are chamfered so that the nuclear fuel assembly can be smoothly inserted into the cell 31 during basket assembly. In this way, it is possible to prevent the plate-shaped member 40 from being scratched, and thereby it is possible to extend the use and life of the basket repeatedly.

[0059]

As described above, according to the basket according to the present invention (Claim 1), the plurality of notches which are orthogonally engaged with both long side end surfaces of the plate-like member forming the basket. And a convex portion is provided in the longitudinal direction of the central portion of both short side end surfaces, and the plate-shaped members are sequentially orthogonally engaged with each other by engaging the cutout portions, and transmitting between the adjacent convex portions. Since the hot plate is fitted to form a lattice-shaped cell for storing the nuclear fuel assembly, the basket can be easily formed, and the heat inside the basket can be transferred to the outside via the heat transfer plate. This has the effect of being able to efficiently conduct power to the motor.

Further, according to the basket of the present invention (claim 2), a plurality of cutouts which are orthogonally engaged with each other are provided on both long side end surfaces of the plate member forming the basket. Along with providing a convex portion in the central portion longitudinal direction of the short side end surface, the plate-shaped member having a longitudinal through-hole penetrating both short side end surfaces of the plate-shaped member sequentially cuts the cutout portion orthogonally to each other. Engagement and combination, the heat transfer plate is externally fitted between the adjacent convex portions to form a grid-like cell for accommodating the nuclear fuel assembly, so that the basket can be easily formed. In addition, the heat inside the basket can be efficiently conducted to the outside through the heat transfer plate, and since the water flow path is formed by the through holes, the basket strength can be increased and maintained. .

Further, according to the basket of the present invention (claim 3), a plurality of cutouts which are orthogonally engaged with each other are provided on both long side end faces of the plate-like member forming the basket. A convex portion is formed in a portion other than the cutout portion of one long side end surface of the shaped member, and a concave portion is formed in a portion other than the cutout portion of the other long side end surface so as to correspond to the convex portion; A convex portion is provided in the central portion longitudinal direction of both short side end surfaces of the plate-shaped member, and the cutout portion is formed by sequentially intersecting the plate-shaped members having the longitudinal through holes penetrating both short side end surfaces with each other. The basket is easily formed because the heat transfer plate is externally fitted between the adjacent convex portions of both short side end surfaces to form a lattice-like cell for storing the nuclear fuel assembly. Can be assembled, and the basket can be assembled by fitting the concave and convex parts. And the heat inside the basket can be efficiently transferred to the outside via the heat transfer plate, and the through hole serves as a water flow path, so that the basket strength can be increased, and This has the effect of being able to be maintained.

According to the basket according to the present invention (claim 4), the edges of both long side end faces of the plate-like member forming the basket are chamfered.
Without damaging the basket when inserting the nuclear fuel assembly into the lattice cells formed after basket assembly,
There is an effect that the basket strength can be maintained.

According to the basket according to the present invention (claim 5), at least a plurality of through holes having a substantially rectangular cross section are provided in the plate-like member forming the basket, so that the strength is further enhanced. There is an effect that a basket made of high plate members can be assembled.

According to the basket according to the present invention (claim 6), the plate-shaped member forming the basket is formed with a partial concave portion and a convex portion on the long side end surface, and the plate-shaped member after basket assembly is formed. Since the misalignment of the contact surface in all directions is eliminated, a prismatic cell space for accommodating the nuclear fuel assembly can be reliably obtained, and the basket can be prevented from being damaged when the nuclear fuel assembly is inserted. It has the effect of being able to.

According to the basket of the present invention (claim 7), the plate-like member forming the basket is
Since it is made of an Al composite material or an Al alloy in which B or a B compound powder having neutron absorption performance is added to l or Al alloy powder, effective neutron absorption can be performed and a lightweight basket can be obtained. Is achieved.

Further, according to the cask according to the present invention (claim 8), a plurality of notches are provided on both long side end faces of the plate member forming the basket of the cask so as to engage with each other at right angles. In addition, a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and the plate-shaped members are sequentially orthogonally engaged with each other by engaging the notch portions, and the heat transfer plate is removed between the adjacent convex portions. Since it has a basket structure in which lattice cells are formed to fit nuclear fuel assemblies, the basket can be easily formed, and heat inside the basket can be efficiently transmitted to the outside via the heat transfer plate. It has the effect of being able to do so.

Further, according to the cask according to the present invention (claim 9), a plurality of notches are provided on both long side end faces of the plate-like member forming the basket of the cask so as to engage with each other at right angles. In addition to providing a convex portion in the central portion longitudinal direction of both short side end surfaces, the notch is formed by sequentially cutting the plate members having a longitudinal through hole penetrating both short side end surfaces of the plate member so as to be orthogonal to each other. The basket structure can be easily formed by forming a lattice-shaped cell for storing the nuclear fuel assembly by externally fitting the heat transfer plate between the adjacent protrusions by engaging and combining the parts. At the same time, the heat inside the basket can be efficiently conducted to the outside through the heat transfer plate, and the through-hole serves as a water flow path, so that the basket strength can be increased and maintained. Achieve the results.

Further, according to the cask according to the present invention (claim 10), a plurality of cutouts which are engaged at right angles to each other are provided on both long side end surfaces of the plate-like member forming the basket of the cask, A convex portion is formed in a portion other than the cutout portion of one long side end surface of the plate-shaped member, and a concave portion is formed in a portion other than the cutout portion of the other long side end surface so as to fit in correspondence with the convex portion,
The plate-shaped member is provided with a convex portion in the longitudinal direction at the center of both short side end surfaces, and the plate-shaped members having the longitudinal through holes penetrating both the short side end surfaces are cut out at right angles to each other sequentially. The basket structure is such that the heat transfer plate is externally fitted between the adjacent convex portions of the two short side end faces to form lattice-like cells for storing the nuclear fuel assemblies, so that the basket can be easily formed. It can be formed, and the displacement of the basket after assembly can be eliminated by fitting the concave and convex portions, and the heat inside the basket can be efficiently transmitted to the outside via the heat transfer plate,
In addition, since the through-hole serves as a flow path for water, the basket strength can be increased and maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an axial direction of a cask applied to the present invention.

FIG. 2 is a sectional view showing a radial direction of the cask shown in FIG.

FIG. 3 is a configuration diagram illustrating an example of a plate member.

FIG. 4 is a configuration diagram illustrating an example of a plate member.

FIG. 5 is a partially assembled perspective view showing the basket according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state between plate-like members during basket assembly.

FIG. 7 is a diagram showing an engagement relationship between a plate member and a heat transfer plate.

FIG. 8 is a partially assembled perspective view showing a basket according to Embodiment 2 of the present invention.

FIG. 9 is a partially assembled perspective view showing a basket according to Embodiment 3 of the present invention.

FIG. 10 is a perspective view showing an example of a conventional cask.

FIG. 11 is a radial sectional view showing the configuration of the cask shown in FIG. 9;

FIG. 12 is a radial sectional view of a conventional PWR cask.

FIG. 13 is a partially assembled perspective view of another basket used for a conventional PWR cask.

FIG. 14 is a partially assembled perspective view of another basket used in a conventional PWR cask.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cask 2 Body main body 3 Cavity 4 Bottom plate 5 Outer cylinder 6 Resin 7 Heat transfer fin 8 Thermal expansion margin 9 Lid 10 Primary lid 11 Secondary lid 15 Auxiliary shield 16 Cask main body 17 Trunnion 31 Cell 32, 32a, 32b Heat transfer Plates 33 to 36, 46, 54, 62, 64, 65 Convex portions 40, 50, 60c to 60f Plate members 41, 42, 51 to 53 Through holes 43 Communication holes 44 Notch portions 45, 61, 63 Concave portions

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[Procedure amendment]

[Submission date] November 24, 2000 (200.11.
24)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Basket and Cask

[Claims]

2. A basket having a neutron shield on its outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk body for shielding γ-rays, wherein both lengths of said plate-like member are On the side end surface, a plurality of notches are provided to engage orthogonally to each other, and a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and the plate-shaped members are sequentially cut at right angles to the notch portions. A basket , wherein the lattice-shaped cells for accommodating the nuclear fuel assemblies are formed by engaging and combining the heat transfer plates between the adjacent protrusions.

3. A basket having a neutron shield on the outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk body for shielding γ-rays, wherein both lengths of the plate-like member are On the side end surface, a plurality of notches are provided which engage with each other at right angles, and a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and a longitudinal direction penetrating both short side end surfaces of the plate-shaped member. The plate-like members having through holes are sequentially combined at right angles to each other by engaging the notches, and externally fitting a heat transfer plate between the adjacent protrusions to house the nuclear fuel assembly. A basket formed with lattice cells.

4. have a neutron shield on the outer circumference, and the basket for performing storage of nuclear fuel assemblies using the plate-like member into the cavity of the shell main body for performing shielding γ rays, both the length of the plate-like member A plurality of cutouts are provided on the side end face to be orthogonally engaged with each other, a projection is formed on a portion other than the cutout on the one long side end face of the plate-shaped member, and a cutout on the other long side end face is formed. A concave portion that fits in correspondence with the convex portion is formed in a portion other than the convex portion, and a convex portion is provided in a central portion longitudinal direction of both short side end surfaces of the plate-shaped member, and a longitudinal direction penetrating the both short side end surfaces. The plate-like members having the through-holes are sequentially combined at right angles to each other by engaging the notch portions, and a heat transfer plate is fitted between the adjacent convex portions of the two short side end faces to form the nuclear fuel. A basket, wherein a lattice-like cell for storing an aggregate is formed.

5. A basket according to any one of claims 1-4, characterized in that the edges of the long sides end faces of the plate-like member to the chamfered shape.

Through hole according to claim 6, wherein said plate-like member is a generally rectangular shaped cross-section, a basket according to any one of claims 3-5, characterized in that provided at least a plurality.

7. A concave and convex portions of the long sides end faces of the plate-like member, one of claims 4 to 6, characterized in that the partial recesses and protrusions on the long side end surface The basket described in the above.

Wherein said plate-like member according to claim characterized in that it is constituted by Al or Al alloy powder Al composite or Al alloy obtained by adding powder of B or B compound having a neutron absorbing performance to 1 7. The basket according to any one of 7 above.

The long sides end faces of 9. plate-like member, a plurality of notches for engagement with mutually orthogonal, and a convex portion provided at the center the longitudinal direction of the two short sides end faces, the plate-like member Along with each other, the notches are engaged with each other and combined with each other, and a lattice-shaped cell for accommodating a nuclear fuel assembly by passing a heat transfer plate between the long side end faces of adjacent plate-like members. A formed basket, a trunk body for storing the basket therein, a neutron shield on the outer periphery, and shielding γ-rays, and a trunk body for taking the nuclear fuel assembly into and out of the lattice-shaped cells And a detachable lid provided at the opening of the cask.

10. A plate-like member having a plurality of cutouts which are engaged with each other at right angles on both long side end faces thereof, and a projection in a longitudinal direction of a central portion of both short side end faces, and said plate-like member. The plate-like members having the longitudinal through holes penetrating both short side end surfaces of the member are sequentially orthogonally engaged with each other by engaging the cutout portions, and for each long side end surface between adjacent plate-like members. Biography
A basket having a grid-like cell formed therein for accommodating a nuclear fuel assembly by passing a hot plate, a trunk body for accommodating the basket therein, having a neutron shield on the outer periphery, and shielding γ-rays, A detachable lid provided at an opening of the trunk main body for taking an assembly into and out of the lattice-shaped cell.

The long sides end faces of 11. plate-like member, a plurality of notches for engagement with mutually orthogonal, the protrusion in the notch portion other than the portion of one long side end surface of the plate-like member Forming and forming a concave portion that fits in correspondence with the convex portion at a portion other than the cutout portion of the other long side end surface, and providing a convex portion in the central longitudinal direction of both short side end surfaces of the plate-shaped member. The plate-like members having longitudinal through holes penetrating both short side end faces are sequentially combined with each other by engaging the notch portions orthogonally to each other, and between adjacent convex portions of the both short side end faces. A basket in which a heat transfer plate is externally fitted to form a lattice-shaped cell for storing a nuclear fuel assembly, and a trunk body for storing the basket therein, having a neutron shield on the outer periphery, and shielding γ-rays Provided in an opening of the trunk body for taking the nuclear fuel assembly into and out of the lattice-shaped cells. Cask, characterized in that the lid removable, provided with a.

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-like member for assembling a basket constituting a cask for containing, transporting and storing spent nuclear fuel assemblies, a basket using the same, and a cask using the same. In particular, pressurized water reactor (PWR)
The present invention relates to a plate-like member for basket assembly, a basket and a cask for r).

[0002]

2. Description of the Related Art A nuclear fuel assembly that has been burned at the end of a nuclear fuel cycle and has become unusable is called spent nuclear fuel. Since spent nuclear fuel contains high-activity materials such as FP, it needs to be thermally cooled. Therefore, the spent nuclear fuel is cooled in a cooling pit of a nuclear power plant for a predetermined period. After that, it is stored in a cask, which is a shielding container, and transported and stored in a reprocessing facility by a truck or a ship. In storing the spent nuclear fuel assembly in the cask, a holding element having a lattice cross section called a basket is used. The spent nuclear fuel assemblies are inserted one by one into cells, which are a plurality of storage spaces formed in the basket, thereby ensuring an appropriate holding force against vibration during transportation.

[0003] As a conventional example of such a cask,
Various types are disclosed in "Atomic energy eye" (published on April 1, 1998: Nikkan Kogyo Shuppan Production), Japanese Patent Application Laid-Open No. 62-242725, and the like. In addition,
Light water nuclear power generation includes boiling water nuclear power generation (BWR:
boiling water reactor) and pressurized water nuclear power (P
WR: pressurized water reactor).

FIG. 10 is a perspective view showing an example of a cask. FIG. 11 is an axial sectional view of the cask shown in FIG. The cask 100 has a cylindrical body 101.
And a resin 102 serving as a neutron shield provided on the outer periphery of the trunk main body 101, and an outer cylinder 103, a bottom 104 and a lid 105. Body 101 and bottom 1
04 is a forged product made of carbon steel which is a γ-ray shield. Further, the lid 105 includes a primary lid 106 and a secondary lid 107 made of stainless steel or the like. Body 101 and bottom 104
Are joined by butt welding. Primary lid 10
6 and the secondary lid 107 are fixed to the body 101 by bolts made of stainless steel or the like. Lid 105
An O-ring made of metal is interposed between the body and the body 101 to maintain the airtightness inside.

A plurality of internal fins 108 for conducting heat are provided between the body 101 and the outer cylinder 103.
Copper is used as the material of the internal fins 108 in order to increase the heat conduction efficiency. The resin 102 has the internal fin 1
08 is injected in a fluidized state into a space formed by solidification by a thermosetting reaction or the like. Basket 109 is 69
As shown in FIG. 11, the rectangular pipes 110 are assembled in a bundle, and are inserted into the cavity 111 of the body 101 in a restricted state.

[0006] The square pipe 110 is made of an aluminum alloy mixed with a neutron absorbing material (boron: B) so that the inserted spent fuel assembly does not reach the criticality. In addition,
On both sides of the cask main body 112, trunnions 113 for suspending the cask 100 are provided (only one is shown). At both ends of the cask main body 112, a buffer 1 having wood or the like incorporated therein as a buffer is provided.
14 (only one is shown). Note that 11
Reference numeral 5 denotes a cell in which a spent nuclear fuel assembly is stored.

By the way, light water nuclear power generation includes boiling water nuclear power generation (BWR).
Pressurized water nuclear power generation (PWR)
tor). The above-described cask 100 is a cask that stores a spent nuclear fuel assembly used for boiling water nuclear power generation (BWR: boiling water reactor).
The nuclear fuel assembly for BWR has a configuration shown in FIG.

FIG. 12 is an axial sectional view of a PWR cask. In FIG. 12, a cask 20 for PWR
In the cavity 111 having a rectangular cross section, plates 217 extending in the radial direction are alternately combined.
5 having a basket 209. Each plate 2
07 is made of an aluminum alloy mixed with B, which is a neutron absorber, like the square pipe 110 for BWR. However, each plate 217 has a through-hole of a cooling water channel 216 extending in the axial direction, a so-called water zone, and fills each basket 209 with water during cooling of the spent nuclear fuel assembly to decelerate neutrons. Neutron absorption by the plate 217 and the resin 102 is performed efficiently. The water filled in each basket 209 and the cooling water flow path 216 is drained and dried after a predetermined cooling period has elapsed.

The provision of the cooling water flow path 216 is because the uranium enrichment of the nuclear fuel assembly for PWR is higher than that of the nuclear fuel assembly for BWR, and the uranium loading amount of the nuclear fuel assembly for PWR is also high. In many cases, since the cross-sectional area of the nuclear fuel assembly is large, the reactivity of the system in which the nuclear fuel assemblies are arranged increases. Here, the distance dd shown in FIG. 12 is a distance that ensures that the spent nuclear fuel assembly becomes subcritical, and the distance dd for PWR needs to have a larger distance than the distance for BWR. There is. Also, the arrangement of the cells 215 is not lattice-shaped and is displaced.
This is because the PWR spent nuclear fuel assembly having a larger sectional area than the spent nuclear fuel assembly described above is efficiently disposed in the cavity 111.

FIG. 13 is a partially assembled perspective view of another basket used in a PWR cask. This PWR
Some casks use an H-shaped plate having a notch 302 and form a basket by combining the notches 302 vertically and horizontally.
In this case, the channel 303 is filled with water as a neutron moderator when the spent nuclear fuel assembly is cooled.

FIG. 14 is a partially assembled perspective view of another basket used in a PWR cask. The basket shown in FIG. 14 is assembled by engaging with the notch 402 of the H-shaped plate 401, but only by engaging the notch 402, the basket with the H-shaped plates located at the upper and lower portions of each H-shaped plate is assembled. Since the position shift occurs and the strength is weak, the support rod 40 penetrating through each engagement portion is formed.
4 to prevent the displacement of all the H-shaped plates 401 from occurring.

[0012]

However, even if the support rods 404 are used, each H-shaped plate 401 will
Since it is conceivable that the H-shaped plate 4 rotates about the fulcrum, the displacement between the H-shaped plates cannot be surely eliminated, the strength of the basket is impaired, and the basket is damaged when the spent nuclear fuel assembly is inserted. There was a problem that it would.

The end of the H-shaped plate is joined to the inner wall surface of the cabinet. However, since the contact area is small, the heat in the basket is not well conducted to the outside, and the subcriticality is ensured by the temperature rise. There was also a problem that it was not possible.

Incidentally, the H constituting the basket for the PWR
Since the mold plate needs to form a flow path to fill the water, the notch for combining in a grid shape
Although it has a certain thickness, it can eliminate the displacement of the H-shaped plate and can have a certain strength, but it is a reality that even higher strength is required.

The present invention has been made in view of the above,
When the basket is constructed by assembling the plate members in a lattice shape, it is possible to eliminate damage to the basket at the time of inserting the nuclear fuel assembly, to surely eliminate displacement between the plate members, and to increase the strength of the basket. It is another object of the present invention to provide a basket assembling plate member, a basket, and a cask that can increase the heat conductivity to the outside of the basket.

[0016]

In order to achieve the above object, a basket according to claim 1 has a neutron shield on the outer periphery and a plate-like member in a cavity of a trunk body for shielding γ rays. In a basket for storing a nuclear fuel assembly by using a plurality of cutouts which are orthogonally engaged with each other on both long side end surfaces of the plate-like member, the plate-like members are sequentially cut at right angles to each other. Engage the notches and combine them, and transfer heat between the short side end faces of adjacent plate members
A grid-like cell for storing the nuclear fuel assembly is formed across the plates .

According to this invention, the long sides end faces of the plate-like members forming the basket, a plurality of notches for engagement with mutually orthogonal, wherein an equivalent plate-like member are sequentially perpendicular to each other along with the combination of the cut-out portion engaged with, next to
A heat transfer plate is provided between the short side end faces of the plate members in contact with each other to form a grid-like cell for storing the nuclear fuel assembly.

[00 18] In addition, a basket according to claim 2 has a neutron shield on the outer circumference, and performs storage of nuclear fuel assemblies using the plate-like member into the cavity of the shell main body for performing shielding γ rays basket In the above, provided at the two long side end surfaces of the plate-shaped member, a plurality of notches that are engaged orthogonally to each other,
In addition, a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and the plate-shaped members are sequentially orthogonally engaged with each other by engaging the notch portions, and the heat transfer plate is removed between the adjacent convex portions. The fuel cell is characterized in that a lattice-shaped cell for accommodating the nuclear fuel assembly is formed by fitting.

[00 19] According to the present invention, the long sides end faces of the plate-like members forming the basket, a plurality of notches for engagement with mutually orthogonal, and in the center the longitudinal direction of the both short sides end faces For example, a convex portion is provided, and the plate-shaped members are sequentially orthogonally engaged with each other by engaging the notches, and a heat transfer plate is externally fitted between the adjacent convex portions to house the nuclear fuel assembly. A lattice cell is formed.

[00 20] In addition, a basket according to claim 3, having a neutron shield on the outer circumference, and performs storage of nuclear fuel assemblies using the plate-like member into the cavity of the shell main body for performing shielding γ rays basket In the above, provided at the two long side end surfaces of the plate-shaped member, a plurality of notches that are engaged orthogonally to each other,
In addition to providing a convex portion in the central portion longitudinal direction of both short side end surfaces, the notch is formed by sequentially cutting the plate members having a longitudinal through hole penetrating both short side end surfaces of the plate member so as to be orthogonal to each other. The lattice-shaped cells for housing the nuclear fuel assemblies are formed by engaging and combining the portions, and externally fitting a heat transfer plate between the adjacent convex portions.

[00 21] According to the present invention, the long sides end faces of the plate-like members forming the basket, a plurality of notches for engagement with mutually orthogonal, and in the center the longitudinal direction of the both short sides end faces Along with providing the convex portion, the plate members having longitudinal through holes penetrating both short side end faces of the plate member are combined by sequentially engaging the notch portions orthogonally to each other,
A heat transfer plate is externally fitted between the adjacent convex portions to form a grid-like cell for storing the nuclear fuel assembly.

[00 22] In addition, a basket according to claim 4, having a neutron shield on the outer circumference, and performs storage of nuclear fuel assemblies using the plate-like member into the cavity of the shell main body for performing shielding γ rays basket In the above, provided at the two long side end surfaces of the plate-shaped member, a plurality of notches that are engaged orthogonally to each other,
A convex portion is formed in a portion other than the cutout portion of one long side end surface of the plate-shaped member, and a concave portion is formed in a portion other than the cutout portion of the other long side end surface so as to fit in correspondence with the convex portion, The plate-shaped member is provided with a convex portion in the longitudinal direction at the center of both short side end surfaces, and the plate-shaped members having the longitudinal through holes penetrating both the short side end surfaces are cut out at right angles to each other sequentially. The heat transfer plates are externally fitted between the adjacent convex portions of the two short side end faces to form lattice cells for accommodating the nuclear fuel assemblies.

[00 23] According to the present invention, the long sides end faces of the plate-like members forming the basket, a plurality of notches for engagement with mutually orthogonal, cut one long side end surface of the plate-like member A convex portion is formed in a portion other than the notched portion, and a concave portion that fits in correspondence with the convex portion is formed in a portion other than the notched portion of the other long side end surface, and a center of both short side end surfaces of the plate-shaped member is formed. Along with providing a convex portion in the longitudinal direction of the portion, the plate-shaped members having longitudinal through holes penetrating both short side end faces are sequentially combined with each other by engaging the cutout portions orthogonally to each other, and A heat transfer plate is externally fitted between the protruding portions of both short side end faces to form a grid-like cell for storing the nuclear fuel assembly.

[00 24] In addition, a basket according to claim 5, in the above invention, characterized in that the edges of the long sides end faces of the plate-like member to the chamfered shape. According to this invention, the edges of both long side end faces of the plate-like member forming the basket are formed into a chamfered shape.

[00 25] In addition, a basket according to claim 6, in the above invention, the through-hole of the plate-like member is a substantially rectangular shape cross-section, characterized by providing at least a plurality. According to the present invention, at least a plurality of through holes having a substantially rectangular cross section are provided in the plate-like member forming the basket.

[00 26] In addition, a basket according to claim 7, in the above invention, recesses and protrusions of the plate-like member,
It is characterized in that it is a partial concave portion and convex portion on the long side end surface. According to the present invention, a partial concave portion and a convex portion are formed on the long side end surface of the plate member forming the basket,
The displacement of the plate-like member contact surface in all directions after the basket is assembled is eliminated.

[00 27] In addition, a basket according to claim 8, in the above invention, the plate-like member is Al or Al alloy powder Al composite or the addition of powders of B or B compound having a neutron absorbing performance to Al It is characterized by being composed of an alloy. According to the present invention, the plate-like member forming the basket is made of Al or Al alloy powder added with B or B compound powder having neutron absorption performance.
It is made of a composite material or an Al alloy.

[00 28] Further, the cask according to claim 9, the long sides end faces of the plate-like member, a plurality of notches for engagement with mutually orthogonal, and in the center the longitudinal direction of the both short sides end faces Protrusions are provided, and the plate-shaped members are sequentially orthogonally engaged with each other by engaging the notches, and the adjacent plate-shaped members are combined.
A basket in which a lattice-like cell for storing a nuclear fuel assembly is provided by passing a heat transfer plate between the long side end faces of the member, and the basket is housed inside, a neutron shield is provided on the outer periphery, and a γ-ray It is characterized by comprising a trunk body for shielding, and a detachable lid provided at an opening of the trunk body for taking the nuclear fuel assembly into and out of the lattice-shaped cells.

[00 29] Further, the cask according to claim 10, the long sides end faces of the plate-like member, a plurality of notches for engagement with mutually orthogonal, and in the center the longitudinal direction of the both short sides end faces provided with a convex portion, in combination with the plate-like member having a longitudinal through hole penetrating the both short sides end faces of the plate-like member are sequentially perpendicular to each other engage the notch, next
A basket which forms a grid-like cell for accommodating a nuclear fuel assembly by passing a heat transfer plate between the long side end faces of the plate-shaped members in contact with each other ;
The basket is housed inside, has a neutron shield on the outer periphery, and a trunk body that shields γ-rays, and is provided at an opening of the trunk body for taking the nuclear fuel assembly into and out of the lattice-shaped cells. And a detachable lid provided.

[00 30] According to the invention of the claim 9 and claim 10, the long sides end faces of the plate-like member to form a cask basket, a plurality of notches for engagement with mutually orthogonal, In addition, a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and the plate members are sequentially orthogonally combined with each other by engaging the notch portions, and the adjacent plate members are combined.
It has a basket structure in which a grid-like cell for storing a nuclear fuel assembly is formed by passing a heat transfer plate between the long side end faces .

[00 31] Further, the cask according to claim 11, the long sides end faces of the plate-like member, a plurality of notches for engagement with mutually orthogonal, cut one long side end surface of the plate-like member A convex portion is formed in a portion other than the notched portion, and a concave portion that fits in correspondence with the convex portion is formed in a portion other than the notched portion of the other long side end surface, and a center of both short side end surfaces of the plate-shaped member is formed. Along with providing a convex portion in the longitudinal direction of the portion, the plate-shaped members having longitudinal through holes penetrating both short side end faces are sequentially combined with each other by engaging the cutout portions orthogonally to each other, and A basket in which a heat transfer plate is externally fitted between the convex portions of both short side end surfaces to form a lattice-like cell for housing the nuclear fuel assembly, and the basket is housed inside, and a neutron shield is provided on the outer periphery; and A trunk body for shielding γ-rays, and the nuclear fuel assembly is put in and out of the lattice cells And a detachable lid provided at an opening of the body.

[00 32] According to the present invention, the long sides end faces of the plate-like member to form a cask basket, a plurality of notches for engagement with mutually orthogonal, one long side end surface of the plate-like member A convex portion is formed at a portion other than the notch portion of the plate member, and a concave portion that fits in correspondence with the convex portion is formed at a portion other than the notch portion of the other long side end surface, and both short side end surfaces of the plate-shaped member are formed. The plate-shaped members having the longitudinal through holes penetrating both short side end faces are provided with a convex portion in the central portion longitudinal direction, and the cutout portions are sequentially engaged with each other by assembling the notches so as to be adjacent to each other. The heat transfer plate is externally fitted between the convex portions of the two short side end surfaces to form a grid-like cell for accommodating a nuclear fuel assembly.

The cask according to claim 12 is a plate
A plurality of engaging members perpendicular to each other
A notch is provided, and the plate-like members are sequentially orthogonal to each other.
By engaging and combining the notches, the nuclear fuel
A basket forming a lattice-like cell for storing the united cells, and γ
Wire shielding and at least one of the baskets
The notch where the outer part of the part makes surface contact
And a torso body provided.

The cask according to claim 13 is a plate
A plurality of engaging members perpendicular to each other
A notch is provided, and the plate-like members are sequentially orthogonal to each other.
Engage and combine the notches and
A heat transfer plate is passed between the long sides of the plate
A basket forming a lattice-like cell for storing the united cells, and γ
Wire shielding and at least one of the baskets
The notch where the outer part of the part makes surface contact
And a torso body provided.

Further , the cask according to claim 14 is an outer casing.
A trunk body having a neutron shield around it and shielding γ-rays
And a plurality of plate members having a neutron absorption capacity.
Grid cell and a transfer line provided on the short side end face of the plate-shaped member.
Forming a basket having a square cross section with the hot plate;
The inner surface of the cavity to the outer shape of the basket
Of the basket inserted into the cavity
Spent fuel assemblies should be stored and stored in each cell.
It is characterized by having done. Further, the cap according to claim 15 is provided.
The cask may be one of the cask in the cavity.
The part is shaped to match the outer shape of the basket
It is characterized by.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the basket inserting method according to the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited by the embodiment.

(Embodiment 1) First, a cask to which the present invention is applied will be described. FIG. 1 is an axial sectional view of a cask to which the present invention is applied. FIG. 2 shows FIG.
FIG. 2 is a radial sectional view of the cask shown in FIG. Cask 1
Is obtained by machining the inner surface of the cavity 3 of the trunk body 2 according to the outer peripheral shape of the basket 30. The machining of the inner surface of the cavity 3 is performed by milling or the like using a dedicated processing device. The basket 30 and a part of the inner surface of the cavity 3 are connected via a heat transfer plate 32. The heat transfer plate 32 is made of a material having good heat conductivity such as Al.
The trunk body 2 and the bottom plate 4 are forged products made of carbon steel having a γ-ray shielding function. Note that stainless steel can be used instead of carbon steel. The body 2 and the bottom plate 4 are joined by welding. In addition, a metal gasket is provided between the primary lid 10 and the body 2 in order to secure the sealing performance as a pressure-resistant container.

The space between the trunk body 2 and the outer cylinder 5 is filled with a resin 6 which is a polymer material containing a large amount of hydrogen and has a neutron shielding function. A plurality of copper heat transfer fins 7 for conducting heat are welded between the body 2 and the outer cylinder 5, and the resin 6 flows in a space formed by the heat transfer fins 7. Injected and cooled and solidified. It is preferable that the heat transfer fins 7 be provided at a high density in a portion having a large amount of heat in order to uniformly radiate heat. A thermal expansion margin 8 of several mm is provided between the resin 6 and the outer cylinder 5.

The lid 9 is composed of a primary lid 10 and a secondary lid 11. The primary lid 10 has a disk shape made of stainless steel or carbon steel that shields γ rays. The secondary lid 11 is also a disk made of stainless steel or carbon steel, and has a resin 12 as a neutron shield on its upper surface.
Is enclosed. The primary lid 10 and the secondary lid 11 are attached to the body 2 with bolts 13 made of stainless steel or carbon steel. Further, metal gaskets are provided between the primary lid 10 and the secondary lid 11 and the body 2 to maintain the internal sealing. Also,
Around the lid 9, an auxiliary shielding body 1 in which a resin 14 is sealed
5 are provided.

The cask 1 is provided on both sides of the cask body 16.
A trunnion 17 is provided for suspending the trunnion.
Although FIG. 1 shows the case where the auxiliary shield 115 is provided, when the cask 1 is transported, the auxiliary shield 15 is removed and a buffer (not shown) is attached.

The basket 30 is formed by alternately assembling plate-like members 40 constituting the cells 31 for storing the spent nuclear fuel assemblies in a vertical and horizontal manner. 32. As the plate-like member 40, an aluminum composite material or an aluminum alloy obtained by adding B or a B compound powder having a neutron absorption performance to Al or an Al alloy powder is used. In addition, cadmium can be used as the neutron absorber in addition to boron. Further, a member obtained by adding B or a B compound having the above-described neutron absorbing ability to a stainless steel material or the like without being limited to aluminum may be used.

FIG. 3 is a view showing a configuration of a plate-like member 40a which is one of the plate-like members 40. FIG. 3 (a) shows a front view of the plate-like member 40a, and FIG. Is a plate-like member 40
3A is a plan view, and FIG. 3C is a right side view of the plate member 40a. In FIG. 3, the plate member 40a
Has through-holes 41 and 42, which penetrate in the longitudinal direction through both short side end faces and have a rectangular cross-sectional shape. In addition, the plate-shaped member 40a has notches 44 from both long side end surfaces at equal intervals along the longitudinal direction. The depth of the notch 44 is １ ／ of the width of the plate member 44. In addition, convex portions 33 and 34 extend in the longitudinal direction of the central portion of both short side end surfaces of the plate member 40a.
Having. The convex portions 33 and 34 form a concave portion at the corner of both short side end surfaces, and the adjacent convex portion 33 or convex portion 34 is formed.
The heat transfer plate 32 is fitted between them. The thickness of the projections 33 and 34 is the same as the thickness of the heat transfer plate 32, and the engagement surfaces are formed to have a shape corresponding to the difference.

The plate-like member 40a has a notch 44
Through both long side end surfaces to form through holes 41 and 42.
And a communication hole 43 that communicates the upper or lower through hole combined in a grid pattern. These through holes 41 and 42 and the communication hole 43 are filled with water during the cooling period in the cooling pool, and the neutrons from the spent nuclear fuel assemblies accommodated in the cell 31 are decelerated, and the plate member 40a or the resin Promote neutron absorption by 6,12,14. To have such a water channel,
This is the case of a cask for PWR, because the uranium enrichment of the spent fuel assembly for PWR is high and subcriticality is ensured.

The plate member 40a is provided with a concave portion 45 on the upper long side end surface, and a convex portion 46 having a shape in which the concave portion 45 is fitted on the lower long side end surface. The concave portion 45 and the convex portion 46 are fitted to upper and lower plate-like members at the time of assembling, which will be described later, so that positional displacement between the plate-like members can be eliminated.

FIG. 4 is a view showing the configuration of a plate member 40b which is one of the plate members 40. FIG. 4 (a) shows a front view of the plate member 40b, and FIG. Is a plate-like member 40
4B shows a plan view, and FIG. 4C shows a right side view of the plate member 40b. The plate member 40b in FIG. 4 has a shape in which both short side end surfaces are inclined, which is different from the plate member 40a shown in FIG. This is in accordance with the shape of the cavity 3. Further, the plate-like member 4
Ob forms convex portions 35 and 36 in the longitudinal direction of both short side end surfaces. One surface of the projections 35 and 36 forms a slope corresponding to the above-described cavity inner wall shape, and the other surface forms the heat transfer plate 3.
2 is formed with a concave slope which can be fitted outside. Other configurations are
This is the same as the plate member 40a shown in FIG. The other plate members 40 are different from the plate members 40a and 40b shown in FIGS. 3 and 4 only in length, and the other configurations are the plate members 40a and 40a shown in FIGS. It has the same configuration as 40b.

Next, the assembly of the basket 30 by the plate-like member 40 will be described with reference to FIG. FIG. 5 is a partially assembled perspective view of the basket 30. In FIG.
The plate members 40d and 40e are arranged in parallel at intervals corresponding to the equal intervals of the notches. The plate-like member 40d,
A plate-like member 40c and a plate-like member 40f whose longitudinal directions are orthogonal to each other are disposed in the upper and lower portions of the plate-like member 40e, respectively.
The notches on the upper portions of the plate members 40d and 40e are engaged with each other so that the notch portions on the lower portions of the plate members 40d and 40e
The notch at the top of 0f is engaged with each other.

For example, the notch 4 of the plate member 40c
4a and the notch 44b of the plate member 40e are engaged, and the notch 44c of the plate member 40e is
f is engaged with the notch 44d. Similarly, the lattice-shaped basket 30 can be formed by alternately engaging the other plate-shaped members 40 vertically and horizontally via the cutouts 44.

In this case, when the plate members 40 are combined, the upper concave portion 45 and the lower convex portion 46 are fitted with each other, resulting in a displacement between the plate members 40, for example, the plate members 40c and 40f.
The positional deviation between them can be eliminated. FIG. 6 is a view showing a cross section of the basket 30 in an assembled state. As shown in FIG. 6, the protrusion 4 provided at the lower part of the plate-like member 40c is provided.
6 and the concave portion 45 provided on the upper part of the plate-like member 40f are fitted to each other to eliminate a displacement in a direction perpendicular to the longitudinal direction, to prevent the wall shape of the cell 31 from becoming uneven, and to use the spent nuclear fuel assembly. The body can be inserted smoothly. The communication holes 43 of the plate members 40 located above and below are connected by the combination of the plate members 40.

FIG. 7 is a diagram showing an engagement relationship between the plate members 40d and 40e and the heat transfer plates 32a and 32b. In FIG. 7, the thickness of the heat transfer plates 32a and 32b is
It is the same as the thickness of d and 33e. Further, the heat transfer plates 32a,
The width of 32b is equal to a value obtained by adding the width of the concave portion on each short side end face formed by the convex portions 33d, 33e to the interval between the plate members 40e, 40d. Further, the heat transfer plates 32a, 32b
Is equal to the height of the plate members 40d and 40e. When the heat transfer plates 32a and 32b are externally fitted to the plate members 40d and 40e, the heat transfer plates 32a and 32b are engaged with each other at a position where the plate members 40d and 40e are bisected (FIG. 7). 32a ', 32b'). In the first embodiment, the basket is easily assembled by stacking a plurality of heat transfer plates 32a and 32b in the height direction of the basket, but the height direction is set to one heat transfer plate. It may be configured.

According to the first embodiment, when a PWR basket requiring a water flow path is formed of a plate-like member, through holes 41 and 42 are provided in each plate-like member 40 to provide a sufficient flow. A passage is provided, and each through hole 4 is formed by the communication hole 43.
1 and 42 are communicated with each other, so that the strength can be increased as compared with the H-shaped plate. In addition, the displacement between the plate members 40 is eliminated by engagement of the concave portions 45 and the convex portions 46. Thus, the shape of the cell 31 can be accurately maintained in a prismatic shape. Further, in the first embodiment described above, the heat transfer plate 32 is externally fitted to the plate-shaped member 40, and the heat conductivity of the plate-shaped member 40 to the outside of the cabinet via the heat transfer plate 32 is improved.

(Embodiment 2) Next, Embodiment 2 will be described. In the above-described first embodiment, two through holes 41 and 42 are provided in each plate-shaped member 40. In the second embodiment, three through holes are provided.

FIG. 8 shows a basket 3 according to the second embodiment.
0 is a partially assembled perspective view. In FIG. 8, each plate-shaped member 50 has three through-holes 51 to 53, and serves as a water flow path. Further, at both short side ends of the plate-shaped member, convex portions 54 are formed in the longitudinal direction, so that the heat transfer plate 32 can be fitted to the outside. Other configurations are the same as those of the plate member 40 in the first embodiment.

According to the second embodiment, the first embodiment
In addition to the function and effect described above, the strength of each plate member 50 can be further increased. The same operation and effect can be obtained even when four or more through holes are provided in each plate member 50.

(Third Embodiment) Next, a third embodiment will be described. In the first and second embodiments described above, the linear concave portions 45 are provided on the upper end surfaces of the plate members 40 and 50, and the linear convex portions 46 are provided on the lower end surfaces.
At the time of assembling 0 and 50, the corresponding concave portions 45 and convex portions 46 are engaged with each other, but in the third embodiment,
Partial recesses are provided in the upper end surfaces of the plate members 40 and 50,
A partial convex portion is provided at a position corresponding to the concave portion, and the concave portion and the convex portion are fitted when the plate members 40 and 50 are assembled.

FIG. 9 shows a basket 3 according to the third embodiment.
0 is a partially assembled perspective view. In FIG. 9, each of the plate members 60c to 60f has a partial recess 6
1 and 63, and the recess 61,
Protrusion portions 62 and 64 having a projection shape to be fitted to 63 are provided. Further, the plate-like members 60c to 60f form the convex portions 65 in the longitudinal direction of both short side end surfaces, so that the heat transfer plate 32 can be fitted to the outside.

When the basket 30 is assembled, the concave portions 61 and 63 and the convex portions 62 and 64 are fitted. For example,
In FIG. 8, the convex portion 62 of the plate-shaped member 60c is fitted into the concave portion 63 of the plate-shaped member 60f, and the positional displacement between the plate-shaped members 60c, 60f can be eliminated.

According to the third embodiment, the basket 3
By assembling the partial concave portions 61, 63 between the plate members and the partial convex portions 62, 64 between the plate members at the time of assembling, the positional deviation between the plate members is eliminated as in the first and second embodiments. In addition to this, it is possible to further eliminate the displacement of the plate-shaped member in the longitudinal direction, and it is possible to more accurately hold the shape of the cell 31 in a prismatic shape.

In the first to third embodiments, the edges of both long side edges of the plate-shaped member 40 are chamfered so that the nuclear fuel assembly can be smoothly inserted into the cell 31 during basket assembly. In this way, it is possible to prevent the plate-shaped member 40 from being scratched, and thereby it is possible to extend the use and life of the basket repeatedly.

[0059]

As described above, according to the basket according to the present invention (claim 2 ), a plurality of notches which are orthogonally engaged with both long side end surfaces of the plate member forming the basket. And a convex portion is provided in the longitudinal direction of the central portion of both short side end surfaces, and the plate-shaped members are sequentially orthogonally engaged with each other by engaging the cutout portions, and transmitting between the adjacent convex portions. Since the hot plate is fitted to form a lattice-shaped cell for storing the nuclear fuel assembly, the basket can be easily formed, and the heat inside the basket can be transferred to the outside via the heat transfer plate. This has the effect of being able to efficiently conduct power to the motor.

Further, according to the basket according to the present invention (claim 3 ), a plurality of cutouts which are orthogonally engaged with each other are provided on both long side end surfaces of the plate-like member forming the basket. Along with providing a convex portion in the central portion longitudinal direction of the short side end surface, the plate-shaped member having a longitudinal through-hole penetrating both short side end surfaces of the plate-shaped member sequentially cuts the cutout portion orthogonally to each other. Engagement and combination, the heat transfer plate is externally fitted between the adjacent convex portions to form a grid-like cell for accommodating the nuclear fuel assembly, so that the basket can be easily formed. In addition, the heat inside the basket can be efficiently conducted to the outside through the heat transfer plate, and since the water flow path is formed by the through holes, the basket strength can be increased and maintained. .

Further, according to the basket of the present invention (claim 4 ), a plurality of cutouts which are orthogonally engaged with each other are provided on both long side end surfaces of the plate-like member forming the basket. A convex portion is formed in a portion other than the cutout portion of one long side end surface of the shaped member, and a concave portion is formed in a portion other than the cutout portion of the other long side end surface so as to correspond to the convex portion; A convex portion is provided in the central portion longitudinal direction of both short side end surfaces of the plate-shaped member, and the cutout portion is formed by sequentially intersecting the plate-shaped members having the longitudinal through holes penetrating both short side end surfaces with each other. The basket is easily formed because the heat transfer plate is externally fitted between the adjacent convex portions of both short side end surfaces to form a lattice-like cell for storing the nuclear fuel assembly. Can be assembled, and the basket can be assembled by fitting the concave and convex parts. In addition to eliminating subsequent displacement, the heat inside the basket can be efficiently transmitted to the outside through the heat transfer plate, and the through-hole serves as a water flow path, so that the basket strength can be increased, In addition, there is an effect that it can be maintained.

According to the basket according to the present invention (claim 5 ), the edges of both long side end faces of the plate-like member forming the basket are chamfered.
Without damaging the basket when inserting the nuclear fuel assembly into the lattice cells formed after basket assembly,
There is an effect that the basket strength can be maintained.

In the basket according to the present invention (claim 6 ), since at least a plurality of through holes having a substantially rectangular cross section are provided in the plate-like member forming the basket, the strength is further enhanced. There is an effect that a basket made of high plate members can be assembled.

According to the basket according to the present invention (claim 7 ), the plate-shaped member forming the basket is formed with a partial concave portion and a convex portion on the long side end surface, and the plate-shaped member after the basket is assembled. Since the misalignment of the contact surface in all directions is eliminated, a prismatic cell space for accommodating the nuclear fuel assembly can be reliably obtained, and the basket can be prevented from being damaged when the nuclear fuel assembly is inserted. It has the effect of being able to.

According to the basket of the present invention (claim 8 ), the plate-like member forming the basket is
Since it is made of an Al composite material or an Al alloy in which B or a B compound powder having neutron absorption performance is added to l or Al alloy powder, effective neutron absorption can be performed and a lightweight basket can be obtained. Is achieved.

The cask according to the present invention (claim)
According to 9 ), a plurality of notches which are engaged with each other at right angles to each other are provided on both long side end surfaces of the plate member forming the basket of the cask, and the plate members are sequentially cut at right angles to each other. together combine engage a part, adjacent
A basket structure is formed in which lattice-like cells for storing the nuclear fuel assemblies are provided by passing the heat transfer plate between the long side end faces of the plate-like member, so that the basket can be easily formed and the heat transfer plate is interposed. This has the effect that heat inside the basket can be efficiently conducted to the outside.

The cask according to the present invention (claim)
According to 10 ), a plurality of cutouts which are orthogonally engaged with each other are provided on both long side end faces of the plate-shaped member forming the basket of the cask, and a long side penetrating both short side end faces of the plate-shaped member is provided. The plate-like members having through holes in the directions are sequentially orthogonally combined with each other by engaging the cutouts, and being adjacent to each other.
A basket structure is formed in which lattice-like cells for storing the nuclear fuel assemblies are provided by passing the heat transfer plate between the long side end faces of the plate-like member, so that the basket can be easily formed and the heat transfer plate is interposed. Thus, the heat inside the basket can be efficiently conducted to the outside, and the strength of the basket can be increased and maintained because the through-hole serves as a flow path for water.

The cask according to the present invention (claim
According to 11 ), a plurality of cutouts which are orthogonally engaged with each other are provided on both long side end surfaces of the plate-like member forming the basket of the cask, and the cutouts on one long side end surface of the plate-like member are provided. A convex portion is formed in a portion other than the notch portion of the other long side end surface, and a concave portion is formed in a portion corresponding to the convex portion in a portion other than the cutout portion,
The plate-shaped member is provided with a convex portion in the longitudinal direction at the center of both short side end surfaces, and the plate-shaped members having the longitudinal through holes penetrating both the short side end surfaces are cut out at right angles to each other sequentially. The basket structure is such that the heat transfer plate is externally fitted between the adjacent convex portions of the two short side end faces to form lattice-like cells for storing the nuclear fuel assemblies, so that the basket can be easily formed. It can be formed, and the displacement of the basket after assembly can be eliminated by fitting the concave and convex portions, and the heat inside the basket can be efficiently transmitted to the outside via the heat transfer plate,
In addition, since the through-hole serves as a flow path for water, the basket strength can be increased and maintained.

The cask according to the present invention (claim
According to 12), a plate-like configuration of a cask basket is provided.
A plurality of cutouts that are orthogonally engaged with each other
A notch is provided so that the plate-shaped members are
The notch portions are engaged and combined, and
At least part of the outer part of the kit
Since the notch to be touched is provided in the cavity,
Has improved thermal conductivity.

The cask according to the present invention (claim
According to 13), both lengths of the plate-like member constituting the basket
A plurality of cutouts that engage at right angles to each other
The plate-shaped members are provided so that
The adjacent plate-shaped members
A heat transfer plate between the long sides of the
At least some of the outer parts are in surface contact with the body
The notch is provided in the cavity,
Thermal conductivity is improved.

The cask according to the present invention (claim)
According to 14), a neutron shield is provided on the outer periphery, and γ-rays
Body that shields air and multiple plates with neutron absorption capacity
Grid-like cell constituted by a plate-like member, and the plate-like member
A basket with a square cross section is formed with the heat transfer plate provided on the short side end face.
Forming the inner surface of the cavity of the trunk body into the basket
Into the cavity, and insert it into the cavity.
Spent fuel assemblies stored in each cell of the loaded basket
The heat transfer plate acts to store
The heat conductivity of the mask is improved.

The cask according to the present invention (claim
According to 15), a part of the cask in the cavity is provided.
Was made to match the shape of the basket,
Improved thermal conductivity and easy cavity processing
Can be done.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an axial direction of a cask applied to the present invention.

FIG. 2 is a sectional view showing a radial direction of the cask shown in FIG.

FIG. 3 is a configuration diagram illustrating an example of a plate member.

FIG. 4 is a configuration diagram illustrating an example of a plate member.

FIG. 5 is a partially assembled perspective view showing the basket according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state between plate-like members during basket assembly.

FIG. 7 is a diagram showing an engagement relationship between a plate member and a heat transfer plate.

FIG. 8 is a partially assembled perspective view showing a basket according to Embodiment 2 of the present invention.

FIG. 9 is a partially assembled perspective view showing a basket according to Embodiment 3 of the present invention.

FIG. 10 is a perspective view showing an example of a conventional cask.

FIG. 11 is a radial sectional view showing the configuration of the cask shown in FIG. 9;

FIG. 12 is a radial sectional view of a conventional PWR cask.

FIG. 13 is a partially assembled perspective view of another basket used for a conventional PWR cask.

FIG. 14 is a partially assembled perspective view of another basket used in a conventional PWR cask.

[Description of Signs] 1 Cask 2 Body 3 Cavity 4 Bottom plate 5 Outer cylinder 6 Resin 7 Heat transfer fin 8 Thermal expansion 9 Cover 10 Primary cover 11 Secondary cover 15 Auxiliary shield 16 Cask body 17 Trunnion 31 Cell 32, 32a, 32b Heat transfer plates 33 to 36, 46, 54, 62, 64, 65 Convex portions 40, 50, 60c to 60f Plate members 41, 42, 51 to 53 Through holes 43 Communication holes 44 Notches 45, 61 , 63 recess

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G21F 9/36 501

Claims (10)

[Claims] 1. A basket having a neutron shield on the outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk body for shielding γ-rays, wherein both lengths of the plate-like member are On the side end surface, a plurality of notches are provided to engage orthogonally to each other, and a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and the plate-shaped members are sequentially cut at right angles to the notch portions. A basket in which the lattice-shaped cells for accommodating the nuclear fuel assemblies are formed by engaging and combining the heat transfer plates between the adjacent convex portions. 2. A basket having a neutron shield on its outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk body for shielding γ-rays, wherein both lengths of said plate-like member are On the side end surface, a plurality of notches are provided which engage with each other at right angles, and a convex portion is provided in the central portion longitudinal direction of both short side end surfaces, and a longitudinal direction penetrating both short side end surfaces of the plate-shaped member. The plate-like members having the through holes are sequentially combined at right angles to each other by engaging the notches, and a heat transfer plate is fitted between the adjacent protrusions to accommodate the nuclear fuel assembly. A basket characterized by forming a shape cell. 3. A basket having a neutron shield on its outer periphery and storing a nuclear fuel assembly using a plate-like member in a cavity of a trunk main body for shielding γ-rays, wherein both lengths of said plate-like member are A plurality of cutouts are provided on the side end surface to engage with each other at right angles to each other, a projection is formed on a portion other than the cutout portion on one long side end surface of the plate-shaped member, and a cutout portion on the other long side end surface A concave portion that fits in correspondence with the convex portion is formed in the other portion, and a convex portion is provided in a central portion longitudinal direction of both short side end surfaces of the plate-shaped member, and a longitudinal direction penetrating the both short side end surfaces. The plate members having through holes are sequentially combined with each other by orthogonally engaging the notches, and a heat transfer plate is externally fitted between the adjacent convex portions of the two short side end faces to form the nuclear fuel assembly. A basket, wherein a lattice-like cell for storing a body is formed. 4. The basket according to claim 1, wherein edges of both long side end faces of the plate-like member are chamfered. 5. The basket according to claim 2, wherein at least a plurality of through holes of the plate-like member have a substantially rectangular cross section and are provided. 6. The concave portion and the convex portion on both long side end surfaces of the plate-shaped member are partial concave portions and convex portions on the long side end surface. The basket described in the above. 7. The plate-shaped member is made of an Al composite material or an Al alloy obtained by adding a B or B compound powder having a neutron absorbing property to an Al or Al alloy powder. 6. The basket according to any one of 6. 8. A plate-shaped member having a plurality of cutouts which are orthogonally engaged with each other on both long side end surfaces thereof, and a convex portion provided in a longitudinal direction of a central portion of both short side end surfaces. A basket in which the cutouts are engaged with each other in a direction orthogonal to each other and combined with each other, and a heat transfer plate is externally fitted between the adjacent protrusions to form a lattice-like cell for storing a nuclear fuel assembly; and And a trunk body that has a neutron shield on the outer periphery and shields γ-rays, and is provided at an opening of the trunk body to take the nuclear fuel assembly into and out of the lattice-shaped cells. A cask comprising: a detachable lid; and 9. A plate-shaped member having a plurality of cutouts which are orthogonally engaged with each other on both long side end surfaces thereof, and a convex portion provided in a longitudinal direction of a central portion of both short side end surfaces, and The plate-shaped members having longitudinal through holes penetrating both short side end surfaces of the member are sequentially orthogonally combined with each other by engaging the notch portions, and removing the heat transfer plate between the adjacent convex portions. A basket which is fitted to form a lattice-shaped cell for storing a nuclear fuel assembly, a trunk body which stores the basket therein, has a neutron shield on the outer periphery and shields γ rays, and the nuclear fuel assembly And a detachable lid provided at an opening of the trunk main body for taking in and out of the lattice-shaped cell. 10. A plurality of notches which are orthogonally engaged with each other on both long side end surfaces of the plate-shaped member, and a projection is formed on a portion other than the notch on one long side end surface of the plate-shaped member. Forming and forming a concave portion that fits in correspondence with the convex portion at a portion other than the cutout portion of the other long side end surface, and providing a convex portion in the central longitudinal direction of both short side end surfaces of the plate-shaped member. The plate-like members having the longitudinal through holes penetrating both short side end faces are sequentially combined with each other by engaging the notch portions orthogonally to each other, and between the adjacent convex portions of the both short side end faces. A basket in which a heat transfer plate is externally fitted to form a lattice-shaped cell for storing a nuclear fuel assembly, and a trunk body for storing the basket therein, having a neutron shield on the outer periphery, and shielding γ-rays Provided in an opening of the trunk body for taking the nuclear fuel assembly into and out of the lattice-shaped cells. Cask, characterized in that the lid removable, provided with a.