JP2016042034A - Fuel holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel holder which facilitates switching of fuel bodies having different standards, and secures soundness of a fuel body at the time of fuel transportation and fuel handling even when a fuel body of any design type is stored.SOLUTION: There is provided a fuel holder 1 which enables a plurality of different kinds of fuel bodies having different external dimensions in a width direction of a fuel rod support component to be shared. The fuel holder 1 includes: a cylindrical member 2 having a fuel storage space F for storing a fuel body provided therein; a support member 3 which is provided on an inner wall surface 2a of the cylindrical member 2, comes in contact with the outside surface of the fuel rod support component in a state where the fuel body is stored in the fuel storage space F, and supports the fuel body in the width direction; a facing member 4 which is provided on an inner wall surface 2b of the cylindrical member 2 facing the inner wall surface 2a so as to face the support member 3; and an adjustment member 5 which is interposed between the support member 3 and the inner wall surface 2a and/or the facing member 4 and the inner wall surface 2b, and has a thickness based on a difference of the external dimensions of the fuel rod support component between the plurality of kinds of the fuel bodies.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel holder, and more particularly to a fuel holder that houses a fuel body for a nuclear reactor such as a light water reactor and is used for transportation of the fuel body.

  Conventionally, a fuel holder is used when transporting a fuel body for a nuclear reactor such as a light water reactor (for example, when transporting from a fuel processing plant to a nuclear power plant). The fuel body is housed in a fuel holder, and the fuel holder is loaded into a fuel transport container and transported to a demand place. In the present specification, the fuel rods bundled with the spacers, the upper tie plate and the lower tie plate are referred to as fuel bodies. On the other hand, the fuel assembly is obtained by covering a fuel body with a channel box and fixing the upper tie plate and the channel box using a channel fastener.

  By the way, various standards (hereinafter also referred to as “design types”) of fuel bodies have been developed, and the outer dimensions in the width direction of the fuel bodies differ depending on the standards. Patent Documents 1 and 2 describe fuel holders that can be used in common for fuel bodies having different standards, that is, fuel holders that can selectively store fuel bodies having different standards.

  In Patent Document 1, a fuel fixing cover having a predetermined thickness is attached to the surface of the receiving plate facing the side surface of the spacer, and this fuel fixing cover is brought into contact with the side surface of the spacer, thereby different fuel bodies having different standards. A fuel holder that can store the battery is described.

  Patent Document 2 discloses a fuel holder that can accommodate two types of fuel bodies whose outer dimensions in the width direction of the fuel bodies are different by the depth of the concave portions by translating a receiving plate having concave portions and convex portions. Have been described. In another embodiment, the receiving plate is composed of two members, a first receiving plate and a second receiving plate, and a superposed state in which the first receiving plate and the second receiving plate overlap and a non-overlapping state in which they do not overlap. By utilizing the fact that the height of the receiving plate changes between them, it is possible to store fuel bodies of different standards. In yet another embodiment, a step is provided on the receiving plate, and the thickness of the receiving plate can be adjusted by rotating the receiving plate.

JP 2012-127729 A JP 2013-64654 A

  Patent Document 1 describes engagement, adhesion, or welding as a technique for fixing the fuel fixing cover to the receiving plate. In the case of adhesion or welding, once the fuel fixing cover is attached to the receiving plate, it is removed thereafter. Is difficult. For this reason, the maintenance work at the time of switching the design type of the fuel body to be stored becomes large.

  On the other hand, when the fuel fixing cover is fixed to the receiving plate by engagement, it is relatively easy to replace the fuel fixing cover according to the standard of the fuel body to be stored. However, in this case, it is not easy to secure the support accuracy of the fuel body and sufficiently suppress the rattling so as not to affect the vibration of the fuel rod as described below.

  That is, when the fuel fixing cover is fixed to the receiving plate by engagement, when the fuel body is stored, the fuel body is caught by the fuel fixing cover and the fuel fixing cover is detached from the receiving plate, or the fuel fixing cover vibrates during fuel transportation. This may cause the fuel fixing cover to come off the receiving plate. In particular, when the fuel fixing cover is detached from the receiving plate during transportation, there is a possibility that rattling occurs and this affects the locked state of the fuel body stored in the fuel holder. In addition, if the fuel fixing cover detached from the receiving plate enters the fuel body, it seriously affects the soundness of the fuel body during transportation or use in the nuclear reactor.

  Furthermore, in order to reliably engage the fuel fixing cover having a complicated shape and the receiving plate, high precision is required for the processing and attachment of the fuel fixing cover and the receiving plate. As a result, the manufacturing cost of the fuel holder may increase or the workability when attaching the fuel fixing cover to the receiving plate may be deteriorated.

  As described above, further improvement of the fuel holder is required in order to prevent rattling after the replacement part such as the fuel fixing cover is attached and to avoid complicating the shape and structure of the replacement part. It was.

  Further, the fuel holder described in Patent Document 2 does not require a replacement part such as a fuel fixing cover, but the shape and structure of the receiving plate are complicated in order to provide compatibility between fuel bodies of different standards. Therefore, the number of parts of the fuel holder may increase, or the soundness of the fuel body may be affected due to malfunction or failure of the receiving plate.

  Prepared to switch the design type of the fuel body to be stored without complicating the shape and structure of the parts or parts unit required to share the fuel holder or increasing the number of components. There has been a demand for further improvement of the fuel holder so as not to increase the number and types of necessary parts.

  The present invention has been made on the basis of the above technical problem, and its purpose is to easily switch between fuel bodies of different standards, and even when a fuel body of any design type is housed, it can be used during fuel transportation. Another object of the present invention is to provide a fuel holder capable of ensuring the soundness of the fuel body during fuel handling.

A fuel holder according to the present invention is a fuel holder that can be used in common for a plurality of types of fuel bodies having different external dimensions in the width direction perpendicular to the axial direction of the fuel rod of a fuel rod support part that supports a plurality of fuel rods. Because
A cylindrical member provided with a fuel storage space for storing a fuel body;
A support member provided on a first inner wall surface of the cylindrical member, wherein the fuel body is in contact with an outer surface of the fuel rod support component in a state where the fuel body is housed in the fuel housing space, and the fuel body is disposed in the width direction. A support member that supports
An opposing member provided on the second inner wall surface of the cylindrical member facing the first inner wall surface so as to face the support member;
An outer shape of the fuel rod support component interposed between the plurality of types of fuel bodies, interposed between the support member and the first inner wall surface and / or between the opposing member and the second inner wall surface. An adjusting member having a thickness based on a dimensional difference;
It is characterized by providing.

In the fuel holder,
The thickness of the adjustment member is equal to the thickness of the fuel rod support component supported by the support member corresponding to the adjustment member, regardless of which of the plurality of types of fuel bodies is accommodated. You may make it set so that the total value with an external dimension may become fixed.

In the fuel holder,
The adjustment member may be configured as a stack of a plurality of adjustment plates each having a thickness set such that the total thickness is substantially equal to the thickness of the adjustment member.

In the fuel holder,
The adjustment member may not be provided when the fuel body having the largest outer dimension of the fuel rod support component is stored among the plurality of types of fuel bodies.

In the fuel holder,
A plurality of the opposing members are provided along the longitudinal direction of the cylindrical member,
At least one of the plurality of facing members is a securing mechanism component that applies a pressing force in the width direction to the fuel rod support component,
Of the plurality of facing members, the facing member that does not have the lashing mechanism includes the fuel rod support component facing the facing member in a state where a fuel body is housed in the fuel housing space and supported by the support member. The displacement limiting mechanism component may be provided so that a gap is left between the two.

In the fuel holder,
The displacement limiting mechanism component may be a facing member adjacent to the spacer.

In the fuel holder,
A fastening member for fastening the opposing member or the supporting member to the cylindrical member is inserted into a through hole provided in the adjusting member, and the adjusting member is moved together with the opposing member or the supporting member by the fastening member. You may make it fasten to a cylindrical member.

The fuel holder according to the present invention comprises:
A fuel holder that can be used in common for a plurality of types of fuel bodies having different outer dimensions in the width direction perpendicular to the axial direction of the fuel rod of a fuel rod support part that supports a plurality of fuel rods,
A cylindrical member provided with a fuel storage space for storing a fuel body;
A support member provided on a first inner wall surface of the cylindrical member, wherein the fuel body is in contact with an outer surface of the fuel rod support component in a state where the fuel body is housed in the fuel housing space, and the fuel body is disposed in the width direction. A support member that supports
An opposing member provided on the second inner wall surface of the cylindrical member facing the first inner wall surface so as to face the support member;
An adjustment member fixed to a support surface of the support member and / or an opposing surface of the opposing member with a screw, and having a thickness based on a difference in external dimensions of the fuel rod support component between the plurality of types of fuel bodies;
It is characterized by providing.

In the fuel holder,
The fuel rod support component adjacent to the adjustment member may be an upper tie plate, a spacer facing the displacement limiting mechanism component, or a lower tie plate.

  According to the present invention, it is easy to switch the fuel bodies of different standards, and it is possible to ensure the soundness of the fuel bodies at the time of fuel transportation and handling even when the fuel bodies of any design type are stored. A fuel holder can be provided.

(A) is the longitudinal cross-sectional view of the fuel holder 1 which concerns on 1st Embodiment in which the fuel body 50M was accommodated, (b) is the state of A1- of (a) in the state which inclined the fuel holder 1 45 degree | times. It is sectional drawing which follows an A1 line. It is the elements on larger scale of Drawing 1 (a) which expanded the field containing counter member 4 as adjustment mechanism parts, and adjustment member 5. (A) is a longitudinal cross-sectional view of the fuel holder 1 in which the fuel body 50L is accommodated, and (b) is a cross-sectional view along the line A2-A2 of (a) in a state where the fuel holder 1 is inclined 45 degrees. is there. 4 is a longitudinal sectional view of the fuel holder 1 when an adjustment member 5 is provided on the support member 3 side. FIG. 5 is a partially enlarged view of FIG. 4 in which a region including the support member 3 that supports the spacer 53M and the adjustment member 5 is enlarged. It is a longitudinal cross-sectional view of the fuel holder 1 in which the fuel body 50S having the smallest outer dimension of the fuel rod support component is accommodated. (A) is a longitudinal cross-sectional view of the fuel holder 1A according to the second embodiment in which the fuel body 50M is accommodated, and (b) is B1- of (a) in a state where the fuel holder 1A is inclined 45 degrees. It is sectional drawing which follows a B1 line. FIG. 8 is a partially enlarged view of FIG. 7 in which a region including the opposing member 11 as a displacement limiting mechanism component and the adjustment member 5 is enlarged. (A) is a longitudinal cross-sectional view of the fuel holder 1A in which the fuel body 50L is accommodated, and (b) is a cross-sectional view taken along the line B2-B2 of (a) in a state where the fuel holder 1A is inclined 45 degrees. is there. (A) is a cross-sectional view at the axial position of the upper tie plate 52M of the fuel holder 1B according to the third embodiment in which the fuel body 50M is accommodated, and (b) is a displacement limiting mechanism of the fuel holder 1B. It is a cross-sectional view at the axial position of the spacer 53M facing the component. It is a longitudinal cross-sectional view in the lower tie plate 54M of the fuel holder 1B which concerns on 3rd Embodiment. It is a longitudinal cross-sectional view which shows the support member 3 (opposing member 4) for lower tie plates, and the adjustment member 5 screwed to the supporting member 3 (opposing member 4).

  Embodiments according to the present invention will be specifically described below with reference to the drawings. In addition, in each figure, the component which has an equivalent function is attached | subjected the same code | symbol, and detailed description of the component of the same code | symbol is not repeated.

(First embodiment)
A fuel holder 1 according to a first embodiment of the present invention will be described. The fuel holder 1 according to the present embodiment is stored in the fuel holder 1 in a state where the fuel body is protected. The fuel holder containing the fuel body is loaded in the fuel transport container and used for transporting the fuel body.

  The fuel holder 1 is a fuel holder that can be shared for a plurality of types of fuel bodies having different design types. Here, the fuel bodies having different design types are fuel bodies having different standards, and more specifically, fuel bodies having different external dimensions in the width direction of the fuel rod support parts. The fuel rod support component is a component of a fuel body that supports a plurality of fuel rods, and specifically refers to a spacer, an upper tie plate, and a lower tie plate. The width direction means a direction orthogonal to the axial direction of the fuel rod. The external dimensions mean standard values or specification values.

  The fuel holder 1 can selectively store fuel bodies 50M and 50L having different design types. The fuel body 50L has the largest outside dimension (WL) in the width direction of the fuel rod support part among the design types, and the fuel body 50M has the outside dimension (WM) in the width direction of the fuel rod support part as the outside dimension of the fuel body 50L. Smaller than (WL).

  In the fuel body 50M (50L), a plurality of fuel rods 51 are arranged in a square lattice shape such as 8 × 8 or 9 × 9, and the upper end portion and the lower end portion of these fuel rods 51 are respectively an upper tie plate 52M. (52L) and the lower tie plate 54M (54L). A plurality of spacers 53M (53L) are arranged at predetermined intervals in the axial direction in a region between the upper tie plate 52M (52L) and the lower tie plate 54M (54L). The fuel rods 51 are supported so as to maintain a predetermined interval.

  A schematic configuration of the fuel holder 1 will be described with reference to FIG. FIG. 1A shows a longitudinal sectional view of the fuel holder 1 in which the fuel body 50M is accommodated, and FIG. 1B shows A1 in FIG. 1A in a state where the fuel holder 1 is inclined 45 degrees. A sectional view taken along line -A1 is shown. Although only one spacer 53M is shown in FIG. 1A, there are actually a plurality of spacers 53M.

  As shown in FIGS. 1A and 1B, the fuel holder 1 includes a cylindrical member 2, a support member 3, a counter member 4, and an adjustment member 5. As shown in FIG. 1B, the fuel holder 1 is inclined by 45 degrees during fuel transportation. However, the fuel holder according to the present invention is not limited by the inclination angle during transportation.

  Hereinafter, details of each component of the fuel holder 1 will be described.

  The cylindrical member 2 is provided with a fuel storage space F for storing a fuel body. The fuel storage space F is formed in a size that can store any type of fuel body.

  The tubular member 2 has a quadrangular prism shape with a substantially square cross section, and the fuel storage space F is defined by the four inner wall surfaces of the tubular member 2. As shown in FIG. 1 (b), the two inner wall surfaces 2a are located on the lower side in the transport state, and the two inner wall surfaces 2b are the wall surfaces facing the inner wall surface 2a of the cylindrical member 2, and the upper side in the transport state. Located in. When the fuel holder 1 is used without an inclination angle during fuel transportation, the inner wall surface (bottom surface) on the vertically lower side is the inner wall surface 2a, and the other three inner wall surfaces are the inner wall surface 2b.

  Both ends of the cylindrical member 2 are closed by side plates 13 and 14 as shown in FIG. The side plates 13 and 14 are made of, for example, a stainless material.

  In addition, the cross-sectional shape of the cylindrical member 2 is not restricted to what is shown in FIG. Moreover, the cylindrical member 2 may be comprised from one cylindrical member, or may be comprised combining several members. In this case, the cylindrical member 2 is configured, for example, as a combination of two structural members having an L-shaped cross section that can be opened and closed via a hinge.

  A plurality of support members 3 are provided on the inner wall surface 2a (lower wall surface) of the cylindrical member 2 along the longitudinal direction. The thickness (height) of the support member 3 is adjusted so that the central axis of the fuel body accommodated in the fuel holder 1 is substantially horizontal. When the width of the fuel body is different among the upper tie plate 52M, the spacer 53M, and the lower tie plate 54M, the thickness of the support member 3 provided for each fuel rod support component is different.

  In the state where the fuel body 50M is stored in the fuel storage space F, the support member 3 is in contact with the outer surface of the fuel rod support component (upper tie plate 52M, spacer 53M, lower tie plate 54M), and the fuel body 50M is adjusted to its width. Support in the direction.

  The support member 3 is a plate-like member made of metal (stainless steel or the like) having a predetermined thickness, for example, and is fixed to the cylindrical member 2 by fixing means such as screws or bolts / nuts.

  As shown in FIG. 1A, a plurality of opposing members 4 are provided on the inner wall surface 2 b of the cylindrical member 2 along the longitudinal direction of the cylindrical member 2 so as to face the support member 3.

  The facing member 4 is, for example, a lashing mechanism part that applies a pressing force to the fuel rod support part in the width direction of the fuel body to tie the fuel body stored in the fuel storage space F. It is preferable that a securing mechanism component is provided for at least one of the plurality of spacers 53M.

  FIG. 2 shows a partially enlarged view of FIG. 1A in which a region including the facing member 4 as the securing mechanism component and the adjusting member 5 is enlarged. As shown in FIG. 2, the opposing member 4 has a base 4a, a pressing part 4b, and an urging part 4c. The base portion 4 a is fixed to the tubular member 2 via the adjustment member 5 with bolts 6 and nuts 7. In the pressing portion 4b, the movable range in the width direction at both ends is limited by the base portion 4a, and the pressing force is applied to the fuel rod support component (the spacer 53M in FIG. 2) by receiving the biasing force of the biasing portion 4c. A pressing force corresponding to the displacement of the spring of the urging portion 4c is applied to the fuel rod support component. The urging unit 4 is not limited to a string spring, but may be a plate spring or the like that applies an urging force to the pressing unit 4b. Further, the securing mechanism component only needs to have a mechanism for applying a predetermined pressing force to the fuel rod support component. For example, a fastening plate (not shown) for the fuel rod support component is secured by a fastening means or the like. It may have a mechanism for adjusting the tightening displacement or the tightening torque.

  Note that the support member 3 and the facing member 4 described above have the same shape when a fuel body of any design type is stored in the fuel holder 1. That is, when the design type of the fuel body to be stored is switched, the support member 3 and the opposing member 4 are not changed and are used as they are.

  The adjustment member 5 is a member for adjusting the difference in the external dimensions of the fuel rod support parts of fuel bodies of different design types. As shown in FIGS. 1 (a) and 1 (b), the adjustment member 5 Further, it is interposed between the inner wall surface 2 b of the tubular member 2. The adjustment member 5 is, for example, a flat plate made of metal (stainless steel or the like) having a predetermined thickness.

  As shown in FIG. 2, the adjustment member 5 is pressure-bonded to the inner wall surface 2 b of the cylindrical member 2, and thus can prevent rattling between the facing member 4 and the adjustment member 5. In addition, since the adjustment member 5 is not fixed to adhesion or welding but is crimped to the tubular member 2, maintenance properties such as replacement and removal of the adjustment member 5 can be improved.

  As shown in FIG. 2, the adjustment member 5 is provided with a through hole 15 that penetrates in the thickness direction. Then, a bolt 6 for fixing the facing member 4 to the inner wall surface 2 b of the cylindrical member 2 is inserted into the through hole 15. The bolt 6 is also inserted into a through hole provided in the base portion 4 a and the pressing portion 4 b of the opposing member 4, and is screwed into the nut 7 to fasten the cylindrical member 2, the adjustment member 5, and the opposing member 4. To do. Thus, the adjustment member 5 is fastened to the tubular member 2 together with the opposing member 4 by fastening members (bolts 6 and nuts 7). Thus, by fixing the adjustment member 5 to the cylindrical member 2 with the fastening member for fixing the opposing member 4 to the cylindrical member 2, an increase in the number of parts of the fuel holder can be avoided.

  The adjusting member 5 may have the same outer dimensions and shape among all or part of the upper tie plate 52M, the spacer 53M, and the lower tie plate 54M.

  Next, the case where the fuel body 50L having the largest outer dimension of the fuel rod support component is accommodated in the fuel holder 1 will be described with reference to FIG. In this case, as shown in FIG. 3A and FIG. 3B, the adjusting member 5 is not provided. As a result, the number of adjustment members 5 required for providing compatibility with fuel bodies of different design types can be greatly reduced. For example, when there are two types of design types, the number of adjustment members 5 that need to be prepared in order to switch the design type is larger than that of a conventional fuel holder in which a dedicated adjustment member 5 is prepared for each design type. Can be cut in half.

  Next, the thickness of the adjustment member 5 will be described. The adjusting member 5 has a thickness based on the difference in the external dimensions of the fuel rod support parts between the fuel body 50M and the fuel body 50L. More specifically, the thickness W of the adjustment member 5 is the same as the thickness W and the fuel rod support supported by the support member 3 corresponding to the adjustment member 5 when any type of fuel body is accommodated. The total value with the external dimensions of the parts is set to be constant. Here, the “supporting member 3 corresponding to the adjusting member 5” refers to the supporting member 3 that faces the facing member 4 that fixes the adjusting member 5. Moreover, when the adjustment member 5 is provided on the support member 3 side as described later, the adjustment member 5 is the support member 3 that fixes the adjustment member 5.

That is, the thickness W of the adjustment member 5 is set so as to satisfy the following formula (1).
W + WM = WL (1)
Here, W is the thickness of the adjusting member 5, WM is the outer dimension of the fuel rod support part of the fuel body 50M, and WL is the outer dimension of the fuel rod support part of the fuel body 50L.

  The adjusting member 5 is not limited to being provided on the facing member 4 side. That is, the adjustment member 5 may be interposed between the support member 3 and the inner wall surface 2a of the tubular member 2 as shown in FIGS. FIG. 4 is a longitudinal sectional view of the fuel holder 1 when the adjustment member 5 is provided on the support member 3 side. FIG. 5 is an enlarged view of the support member 3 that supports the spacer 53M and the region including the adjustment member 5. FIG. 5 shows a partially enlarged view of FIG. 4. As shown in FIG. 5, the support member 3 is fastened to the cylindrical member 2 via the adjustment member 5 with a screw 10, and the adjustment member 5 is crimped to the inner wall surface 2 a of the cylindrical member 2.

  More specifically, as shown in FIG. 5, the adjustment member 5 is provided with a through hole 15. Then, a screw 10 for fixing the support member 3 to the inner wall surface 2 a is inserted through the through hole 15. The screw 10 is screwed into the screw hole of the support member 3 to fasten the cylindrical member 2, the adjustment member 5, and the opposing member 3. Thus, the adjustment member 5 is fastened to the cylindrical member 2 together with the support member 3 by the fastening member (screw 10). By fixing the adjustment member 5 to the cylindrical member 2 with a fastening member for fixing the support member 3 to the cylindrical member 2, an increase in the number of parts of the fuel holder can be avoided.

The fuel holder 1 can also accommodate a fuel body 50S whose outer dimension in the width direction of the fuel rod support component is smaller than the fuel body 50M. In this case, for example, the adjustment member 5 is composed of a plurality of adjustment plates. FIG. 6 is a longitudinal sectional view of the fuel holder 1 in which the fuel body 50S is accommodated. In this case, the adjusting member 5 is configured as a superposition of two adjusting plates 5a and 5b each having a thickness set so that the total thickness is substantially equal to the thickness of the adjusting member 5. Yes. That is, the thicknesses of the adjustment plates 5a and 5b are set so as to satisfy the following expressions (2) and (3).
Wa + Wb = W ′ (2)
W ′ + WS = WL (3)
Here, Wa: the thickness of the adjusting plate 5a, Wb: the thickness of the adjusting plate 5b, W ′: the thickness of the adjusting member 5, WS: the outer dimensions of the fuel rod support part of the fuel body 50S, WL: the fuel body 50L The outer dimensions of the fuel rod support part.

  For example, when storing the fuel body 50S, an adjustment plate 5b having a thickness Wb (= WM−WS) is added to the adjustment plate 5a having a thickness satisfying the expression (1) (that is, Wa + WM = WL). Good.

  Further, by configuring the adjusting member 5 from three or more adjusting plates, it is possible to deal with four or more different types of fuel bodies.

  In this way, the adjustment member 5 is configured by superimposing a plurality of adjustment plates, so that adjustments to be prepared are required as compared with the case where one adjustment plate is prepared for each fuel body of a different design type. The number of plates can be reduced.

  In the above example, the adjustment member 5 is composed of a plurality of adjustment plates. However, a single adjustment plate having a thickness of Wa + Wb may be used.

  In the above description of the embodiment, the adjustment member 5 is provided only on either the support member 3 side or the opposing member 4 side. However, the present invention is not limited to this, and the inner wall surface 2a with the support member 3 is provided. The adjusting member 5 may be provided both between and between the opposing member 4 and the inner wall surface 2b.

  As described above, in the first embodiment, a plurality of types of fuel bodies having different design types can be selectively attached / detached (including the increase / decrease of the adjustment plate) according to the design type of the fuel bodies to be stored. Store in. Therefore, according to 1st Embodiment, the design type of the fuel body accommodated in the fuel holder 1 can be switched easily.

  Further, when the fuel body 50L having the largest outer dimension of the fuel rod support component is stored in the fuel holder 1, the adjustment member 5 is not provided, so that the number of necessary adjustment members 5 can be greatly reduced.

  Further, since the thickness of the adjustment member 5 can be adjusted with high accuracy, the width dimension of the fuel storage space F (inner width of the cylindrical member 2) can be adjusted with high accuracy according to the design type of the fuel body. it can.

  Further, since the adjustment member 5 adjusts the width dimension of the fuel storage space F, the same thing can be used for the support member 3 and the opposing member 4 even if the design type of the fuel body to be stored is changed. . Even when the same support member 3 and opposing member 4 are used, the relationship between the condition for supporting or securing the fuel rod support component and the inner width of the cylindrical member 2 and the outer dimensions of the fuel body Does not change depending on the design type. For this reason, the characteristic (for example, pressing force by a displacement limiting mechanism component) which influences the vibration characteristic of the fuel body at the time of transportation can be made constant.

  Further, since the adjusting member 5 is pressure-bonded between the opposing member 4 (or the supporting member 3) and the tubular member 2 and is surely prevented from falling off, the fuel body is released from being locked or loosened during transportation. It is possible to prevent rattling from occurring.

  Therefore, according to the first embodiment, even when any type of fuel body is stored in the fuel holder 1, the soundness of the fuel body during fuel transportation or fuel handling can be ensured. That is, it is possible to ensure fuel soundness equivalent to that of a fuel holder designed and manufactured exclusively for each design type.

  In addition, according to the first embodiment, since a member (flat plate or the like) having a simple shape and structure is used as the adjustment member 5, it is easy to process and procure the adjustment member 5 and increase the manufacturing cost of the fuel holder 1. Not invited. Furthermore, since the adjustment member 5 can be easily attached and detached, workability when changing the design type of the fuel body to be stored can be improved.

  Further, according to the first embodiment, since the support member 3 and the facing member 4 can be the same as the conventional one, the surface where the support member 3 and the facing member 4 face the side surface of the fuel rod support component is It is a flat surface with no steps. For this reason, when a fuel body is stored in the fuel holder 1 or taken out of the fuel holder 1, interference between the fuel body and the fuel holder 1 can be prevented.

(Second Embodiment)
Next, a fuel holder 1A according to a second embodiment of the present invention will be described. One of the differences between the second embodiment and the first embodiment is that at least one of a plurality of opposing members provided on the inner wall surface 2b of the cylindrical member 2 is a displacement limiting mechanism component. It is.

  Hereinafter, the second embodiment will be described with a focus on differences from the first embodiment.

  A fuel holder 1 </ b> A according to the second embodiment includes a cylindrical member 2, a support member 3, opposing members 4 and 11, and an adjustment member 5. A plurality of types of fuel bodies can be selectively stored.

  Of the opposing members provided on the inner wall surface 2b, the opposing member corresponding to the upper tie plate 52M, the opposing member corresponding to the left spacer 53M in FIG. 7A, and the opposing member corresponding to the lower tie plate 54M are It is a securing mechanism component demonstrated in 1st Embodiment.

  On the other hand, the opposing member 11 corresponding to the right spacer 53M in FIG. 7A is a displacement limiting mechanism component. As shown in FIGS. 7A, 7B, and 8, the opposing member 11 is opposed to the opposing member 11 in a state in which the fuel body is stored in the fuel storage space F and supported by the support member 3. And a fuel rod support component (spacer 53M) to be provided. Thereby, the opposing member 11 functions as a displacement limiting mechanism component that limits the displacement of the fuel body stored in the fuel holder 1A beyond the gap in the width direction. This displacement limiting mechanism component does not tie up the fuel rod support component such as a spacer in a normal state, but abnormal acceleration and impact so that the fuel rod support component (fuel body) is not supported by the support member 3 during fuel transportation. When this occurs, the fuel rod support part (fuel body) is supported.

  Although the opposing member adjacent to the spacer is preferably the displacement limiting mechanism component, the opposing member corresponding to the upper tie plate or the lower tie plate may be the displacement limiting mechanism component.

  Next, the case where the fuel body 50L having the largest outer dimension of the fuel rod support component is accommodated in the fuel holder 1A will be described with reference to FIG. In this case, as shown in FIG. 9A and FIG. 9B, the adjustment member 5 is not provided. As a result, the number of adjustment members 5 required for providing compatibility with fuel bodies of different design types can be greatly reduced.

  Similar to the first embodiment, the thickness of the adjustment member 5 is supported by the support member 3 corresponding to the thickness and the adjustment member 5 when any type of fuel body is accommodated. The total value with the outer dimensions of the fuel rod support parts is set to be constant. For this reason, the size of the gap between the displacement limiting mechanism component and the fuel rod support component when the fuel body 50L is accommodated is the same as when the fuel body 50M is accommodated.

  According to said 2nd Embodiment, the effect similar to 1st Embodiment can be acquired.

  Furthermore, in the second embodiment, as described above, the size of the gap between the displacement limiting mechanism component and the fuel rod support component is constant regardless of the design type of the fuel body to be accommodated. As a result, the displacement limiting mechanism component can function under the same conditions as before switching the design type of the fuel body.

  Therefore, according to the second embodiment, the soundness of the fuel body during transportation can be ensured regardless of the design type of the fuel body housed in the fuel holder 1A. That is, it is possible to ensure fuel soundness equivalent to that of a fuel holder designed and manufactured exclusively for each design type.

(Third embodiment)
Next, a fuel holder 1B according to a third embodiment of the present invention will be described. One of the differences between the third embodiment and the first embodiment is that an adjustment member 5 is provided on the support surface of the support member 3 for the support member 3 that contacts a predetermined fuel rod support component. It is a point.

  Hereinafter, the third embodiment will be described with a focus on differences from the first embodiment.

  As shown in FIGS. 10A and 10B, the fuel holder 1 </ b> B according to the third embodiment includes a cylindrical member 2, a support member 3, opposing members 4 and 11, and an adjustment member 5. Thus, similarly to the fuel holders 1 and 1A according to the first and second embodiments, it is possible to selectively store a plurality of types of fuel bodies having different design types.

  As shown in FIGS. 10A and 10B, the adjustment member 5 is fixed to the support surface of the support member 3 with screws 16. Here, the “support surface” of the support member 3 is a surface that contacts the fuel rod support component and supports the fuel body when the fuel body is stored in the fuel holder 1B.

  More specifically, the adjustment member 5 is formed with a counterbore for accommodating the head of the screw 16. The adjustment member 5 is fixed on the support member 3 by being inserted into a counterbore hole of the adjustment member 5 placed on the support member 3 and screwed into the screw hole of the support member 3.

  Further, as shown in FIGS. 10A and 10B, the counterbore of the adjustment member 5 is provided so as to avoid the protrusion 52Ma of the upper tie plate 52M and the protrusion 53Ma of the spacer 53M. Thereby, rattling when the fuel body is stored can be prevented, and the support accuracy of the fuel body can be ensured.

  The adjusting member 5 may be provided on the facing surface of the facing member 4. Here, the “facing surface” of the facing member 4 is a surface that faces the outer surface of the fuel rod support component when the fuel body is stored in the fuel holder 1B. Also in this case, the adjustment member 5 is screwed to the opposing member 4.

  FIG. 11 shows a longitudinal sectional view of the fuel holder 1B at the lower tie plate 54M. 12 (a) and 12 (b) are longitudinal sectional views showing a support member 3 (opposing member 4) for the lower tie plate and an adjusting member 5 fixed to the support member 3 (opposing member 4) by screws. The figure is shown.

  As shown in FIG. 11, an inclined portion 54Ma having an inclination of a predetermined angle (for example, 45 °) exists on the outer surface of the lower tie plate 54M. The adjustment member 5 has a first side portion inclined substantially at the same angle as the inclined portion 54Ma, and is fixed to the support surface of the support member 3 and the opposing surface of the opposing member 4 by screws 16. The axial length L1 and thickness L2 (see FIG. 12A) of the adjusting member 5 are determined according to the standard of the lower tie plate. That is, the axial length L1 of the adjustment member 5 may be determined such that the side surface portion of the lower tie plate of a predetermined standard contacts the first side portion of the adjustment member 5 when the fuel body is stored. Alternatively, the axial length L1 may be caused by a manufacturing dimensional error between the lower tie plate and the fuel holder between the side surface portion of the lower tie plate of a predetermined standard and the first side portion of the adjustment member 5 when the fuel body is stored. You may decide so that the gap of the magnitude | size based may be vacant.

  The adjusting member 5 having the axial length L1 set as described above is prepared for each lower tie plate standard. And the adjustment member 5 according to the specification of a lower tie plate is provided in the support member 3 or the opposing member 4. FIG. Thereby, the distance between the side surface portion of the lower tie plate and the first side portion of the adjustment member 5 can be made substantially constant for the lower tie plate of any standard. As a result, when axial acceleration is applied to the fuel body during fuel transportation or fuel handling, the amount of axial movement of the fuel body stored in the fuel holder is almost the same for any lower tie plate of any standard. The amount of movement can be suppressed.

  As shown in FIGS. 11 and 12A, the support member 3 (opposing member 4) has a shaft that comes into contact with the second side of the adjustment member 5 (the side opposite to the first side). A direction movement prevention unit 3s (4s) is provided. Thereby, even when the adjustment member 5 is pushed upward in the axial direction by the inclined portion 54Ma of the lower tie plate 54M in order to move the fuel body stored in the fuel holder 1B to the upper side in the axial direction (left side in FIG. 11), The adjustment member 5 is prevented from moving upward in the axial direction by the axial movement prevention portion 3s (4s). Accordingly, it is possible to prevent the screw 16 from being broken by applying a large shear load to the screw 16 that fixes the adjusting member 5.

  As a method of fixing the adjusting member 5 with screws, the supporting member 3 (opposing member 4) and the adjusting member 5 may be fastened together by inserting screws from the outside of the fuel holder. In this case, for example, as shown in FIG. 12B, a counterbore hole is provided in the cylindrical member 2, and a screw 16 is inserted from the outside of the cylindrical member 2, and the support member 3 (opposing member 4) and adjustment are performed. The adjusting member 5 is fixed by screwing with the screw hole of the member 5.

  About the thickness of the adjustment member 5, since it is the same as that of 1st Embodiment, detailed description is abbreviate | omitted. When the fuel body 50L is stored, the adjustment member 5 is detached from the support member 3 as in the first embodiment. Further, the adjustment member 5 fixed with screws is an upper tie plate, a spacer facing the displacement limiting mechanism component, or a lower tie plate among a plurality of fuel rod support components in a state where the fuel body is housed in the fuel holder. Adjacent to each other.

  According to said 3rd Embodiment, the effect similar to 1st Embodiment can be acquired.

  In the third embodiment, although the adjusting member 5 is not pressure-bonded between the opposing member 4 (or the supporting member 3) and the tubular member 2, it is fixed to the opposing member 4 (or the supporting member 3) with screws 16. Therefore, it is possible to prevent the fuel body from being unsecured during transportation and from being loosened or loosened.

  If necessary, spot welding may be performed between the screw 16 and a counterbore for the screw 16. As a result, it is possible to reliably prevent the screw 16 from being loosened and the fuel body from being unbound, or from being loosened or rattled.

  Furthermore, in the third embodiment, since the head of the screw 16 that fixes the adjustment member 5 fits in the counterbore of the adjustment member 5, the screw 16 does not protrude from the adjustment member 5. In addition, the counterbore is provided to avoid protrusions (52Ma, 53Ma) of the fuel rod support part. For this reason, when a fuel body is accommodated in the fuel holder 1B or taken out from the fuel holder 1B, interference between the fuel body and the fuel holder 1B can be prevented.

  Furthermore, as described with reference to FIGS. 11 and 12, when the adjusting member 5 according to the third embodiment is applied to the lower tie plate, the axis set according to the standard of the inclined portion of the lower tie plate An adjusting member 5 having a directional length L1 is used. As a result, when axial acceleration is applied to the fuel body during fuel transportation or fuel handling, the amount of axial movement of the fuel body stored in the fuel holder is substantially the same for any standard lower tie plate. The amount of movement can be suppressed.

  Based on the above description, those skilled in the art may be able to conceive additional effects and various modifications of the present invention, but the aspects of the present invention are not limited to the individual embodiments described above. . You may combine suitably the component covering different embodiment. Various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

1, 1A, 1B Fuel holder 2 Tubular members 2a, 2b Inner wall surface 3 Support member 3s Axial movement prevention part 4 Opposing member (locking mechanism component)
4a Base part 4b Pressing part 4c Biasing part 4s Axial movement prevention part 5 Adjustment member 5a, 5b Adjustment plate 6 Bolt 7 Nut 10, 12, 16 Screw 11 Opposing member (displacement limiting mechanism component)
13, 14 Side plate 15 (through adjustment member 5) Through holes 50S, 50M, 50L Fuel body 51 Fuel rods 52S, 52M, 52L Upper tie plate 52Ma (upper tie plate) projections 53S, 53M, 53L Spacer 53Ma (spacer) Projections 54S, 54M, 54L Lower tie plate 54Ma (of lower tie plate) Inclined portion F Fuel storage space

Claims (9)

A fuel holder that can be used in common for a plurality of types of fuel bodies having different outer dimensions in the width direction perpendicular to the axial direction of the fuel rod of a fuel rod support part that supports a plurality of fuel rods,
A cylindrical member provided with a fuel storage space for storing a fuel body;
A support member provided on a first inner wall surface of the cylindrical member, wherein the fuel body is in contact with an outer surface of the fuel rod support component in a state where the fuel body is housed in the fuel housing space, and the fuel body is disposed in the width direction. A support member that supports
An opposing member provided on the second inner wall surface of the cylindrical member facing the first inner wall surface so as to face the support member;
An outer shape of the fuel rod support component interposed between the plurality of types of fuel bodies, interposed between the support member and the first inner wall surface and / or between the opposing member and the second inner wall surface. An adjusting member having a thickness based on a dimensional difference;
A fuel holder comprising:   The thickness of the adjustment member is equal to the thickness of the fuel rod support component supported by the support member corresponding to the adjustment member, regardless of which of the plurality of types of fuel bodies is accommodated. The fuel holder according to claim 1, wherein the fuel holder is set so that a total value of the outer dimensions is constant.   The adjustment member is configured as a stack of a plurality of adjustment plates each having a thickness set such that the total thickness is substantially equal to the thickness of the adjustment member. The fuel holder according to claim 2.   The adjustment member is not provided when the fuel body having the largest outer dimension of the fuel rod support component among the plurality of types of fuel bodies is stored. Fuel holder. A plurality of the opposing members are provided along the longitudinal direction of the cylindrical member,
At least one of the plurality of facing members is a securing mechanism component that applies a pressing force in the width direction to the fuel rod support component,
Of the plurality of facing members, the facing member that does not have the lashing mechanism includes the fuel rod support component facing the facing member in a state where a fuel body is housed in the fuel housing space and supported by the support member. The fuel holder according to any one of claims 1 to 4, wherein the fuel holder is a displacement limiting mechanism component provided so that a gap is left between them.   The fuel holder according to claim 5, wherein the displacement limiting mechanism component is an opposing member adjacent to the spacer.   A fastening member for fastening the opposing member or the supporting member to the cylindrical member is inserted into a through hole provided in the adjusting member, and the adjusting member is moved together with the opposing member or the supporting member by the fastening member. The fuel holder according to any one of claims 1 to 6, wherein the fuel holder is fastened to a cylindrical member. A fuel holder that can be used in common for a plurality of types of fuel bodies having different outer dimensions in the width direction perpendicular to the axial direction of the fuel rod of a fuel rod support part that supports a plurality of fuel rods,
A cylindrical member provided with a fuel storage space for storing a fuel body;
A support member provided on a first inner wall surface of the cylindrical member, wherein the fuel body is in contact with an outer surface of the fuel rod support component in a state where the fuel body is housed in the fuel housing space, and the fuel body is disposed in the width direction. A support member that supports
An opposing member provided on the second inner wall surface of the cylindrical member facing the first inner wall surface so as to face the support member;
An adjustment member fixed to a support surface of the support member and / or an opposing surface of the opposing member with a screw, and having a thickness based on a difference in external dimensions of the fuel rod support component between the plurality of types of fuel bodies;
A fuel holder comprising:   9. The fuel holder according to claim 8, wherein the fuel rod support component adjacent to the adjustment member is an upper tie plate, a spacer facing the displacement limiting mechanism component, or a lower tie plate.

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