JP2010217024A - Basket and cask - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the stress generated in square pipes constituting cells. <P>SOLUTION: A basket 10 includes a group 12 of the square pipes 12a, an X-direction plate member 13 and a Y-direction plate member 14. The group 12 of the square pipes 12a is constituted by laying out the square pipes 12a made up by including an X lateral face 12ax and a Y lateral face 12ay which are orthogonal to each other in two directions, the X and Y directions, inside the shell body 91 of a cask 90. The X-direction plate member 13 is placed parallel to the X lateral faces 12ax between those facing each other among lateral faces of adjoining square pipes 12a and both ends of the member 13 facing the inner peripheral face 91a of the shell body 91 are in contact with the face 91a. The Y-direction plate member 14 is placed parallel to the Y lateral faces 12ay between those facing each other among lateral faces of adjoining square pipes 12a and both ends of the member 14 facing the inner peripheral face 91a are in contact with the inner peripheral face 91a or with a structural member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a basket in which a fuel rod assembly is stored and a cask including the basket.

  The cask is formed with a cell in which a fuel rod assembly is stored in a basket in the cask. The cell is formed, for example, by inserting a square pipe toward the central axis of the trunk body of the cask. Patent Document 1 discloses a technique in which a reinforcing plate, which is a plate-like member, is provided in a basket for the purpose of facilitating assembly of the basket.

Japanese Patent Laid-Open No. 9-159796

  Here, the cask is carefully transported with sufficient safety. In order to transport the cask more safely, it is preferable to assume that an impact is applied to the cask. Therefore, as a general test for the cask, there is a drop test in which the cask is dropped on the ground.

  The plate-like member disclosed in Patent Document 1 functions as a reinforcing plate that increases the strength of the entire basket, but it is not assumed that an impact is applied to the cask. For example, when the cask disclosed in Patent Document 1 is caused to collide with the ground in a drop test, stress may be generated in the square pipe constituting the cell depending on the attitude of the cask when colliding with the ground.

  Assuming that the cask collides with the ground, the load of the other square pipes and fuel rod assemblies arranged on the vertical upper side of the vertical lower square pipes is reduced by the vertical lower square pipe. Because it works. Thereby, the technique of patent document 1 cannot fully reduce the stress which generate | occur | produces in a square pipe.

  This invention is made | formed in view of the above, Comprising: It aims at reducing the stress which generate | occur | produces in the square pipe which comprises a cell.

  In order to solve the above-described problems and achieve the object, a basket according to the present invention includes a square pipe group configured by arranging a plurality of square pipes inside a trunk body of a cask, and a central axis of the trunk body. And an X-direction plate-like member that divides the square pipe group into a plurality of pieces, and an X-direction plate-like member that is parallel to the central axis and perpendicular to the first direction plate-like member, and further divides the square pipe group into a plurality of pieces. Y-direction plate-like member.

  In order to solve the above-described problems and achieve the object, a cask according to the present invention includes a trunk body formed in a cylindrical shape, a bottom portion provided at one end of the trunk body, and the trunk body. A lid portion provided at the other end of the cylinder body, a square pipe group formed by arranging a plurality of square pipes inside the trunk body, and the square pipe provided in parallel with a central axis of the trunk body. An X-direction plate-like member that divides the group into a plurality of pieces, and a Y-direction plate-like member that is parallel to the central axis and orthogonal to the first direction plate-like member and further divides the square pipe group into a plurality of pieces. It is characterized by.

  Furthermore, as a preferable specific aspect of the present invention, the square pipe is configured to include an X side surface and a Y side surface orthogonal to the X side surface, and the square pipe group is disposed inside the trunk body. X direction that is parallel to the X side surface and perpendicular to the central axis of the trunk body, and Y direction that is parallel to the Y side surface and perpendicular to the central axis are arranged in two directions, The X-direction plate-like member is provided between the X side surfaces facing each other among the side surfaces of the adjacent square pipes, and is provided at both ends facing the inner peripheral surface of the trunk body. The Y-side plate-shaped member is in contact with the inner peripheral surface or the structural member in contact with the inner peripheral surface, and the Y-direction plate-like member is disposed between the Y side surfaces facing each other among the side surfaces of the adjacent square pipes. Both parallel to the inner peripheral surface It is desirable that part is in contact with the inner peripheral surface or the structural member.

  Here, if the X-direction plate member and the Y-direction plate member are not provided in the trunk body, assuming that the cask collides with the ground, for example, from the side periphery of the trunk body, All the loads of the other square pipes and fuel rod assemblies arranged on the upper side in the vertical direction of the square pipe are loaded on the arranged square pipes.

  However, with the above configuration, in the basket and the cask according to the present invention, the square pipe group including a plurality of square pipes is divided into the X-direction plate member and the Y-direction plate member. Therefore, the basket and the cask according to the present invention receive at least a part of the load by the X-direction plate member or the Y-direction plate member.

  The load received by the X-direction plate member or the Y-direction plate member is transmitted to the inner peripheral surface of the trunk body that the X-direction plate member and the Y-direction plate member contact. Thereby, the basket and cask which concern on this invention can reduce the load loaded on a square pipe. Therefore, the basket and cask according to the present invention can reduce the stress generated in the square pipe.

  Here, assuming that the cask collides with the ground in the Y direction, the X-direction plate member receives at least a part of the load in the basket and the cask according to the present invention. Assuming that the cask collides with the ground in the X direction, the Y-direction plate member receives at least a part of the load in the basket and the cask according to the present invention.

  In addition, assuming that the cask collides with the ground in the intermediate direction between the X direction and the Y direction, the basket and the cask according to the present invention are configured such that at least a part of the load includes the X direction plate-shaped member and the Y direction. Both are received by the direction plate member. As described above, the basket and the cask according to the present invention can reduce the stress generated in the square pipe by reducing the load applied to the square pipe regardless of the direction in which the cask collides with the ground.

  As a preferred aspect of the present invention, the X-direction plate-shaped member includes a first X-direction plate-shaped member, a second X-direction plate-shaped member that is spaced from the first X-direction plate-shaped member in the Y direction, and It is desirable to be composed of two pieces.

  With the above configuration, the basket according to the present invention increases the number of square pipe groups divided in the Y direction. Therefore, the basket which concerns on this invention can reduce more appropriately the load loaded on each square pipe, when the case where a cask collides with the ground toward the Y direction is assumed. Therefore, the basket which concerns on this invention can reduce the stress which arises in a square pipe more suitably.

  As a preferable aspect of the present invention, the Y-direction plate-shaped member includes a first Y-direction plate-shaped member, a second Y-direction plate-shaped member disposed at an interval in the X direction from the first Y-direction plate-shaped member, and It is desirable to be composed of two pieces.

  With the above configuration, the basket according to the present invention increases the number of square pipe groups divided in the X direction. Therefore, the basket which concerns on this invention can reduce more suitably the load loaded on each square pipe, when the case where a cask collides with the ground toward X direction is assumed. Therefore, the basket which concerns on this invention can reduce the stress which arises in a square pipe more suitably.

  Here, as one of the cases in which the X-direction plate-like member and the Y-direction plate-like member are each composed of two sheets, the basket includes the first X-direction plate-like member and the second X-direction plate. The square pipe group is divided into five or nine parts by a member, a first Y-direction plate member, and a second Y-direction plate member.

  As a preferable aspect of the present invention, it is preferable that the trunk body is formed in a cylindrical shape, and the X-direction plate member and the Y-direction plate member are provided through a central axis of the trunk body.

  Here, when the X-direction plate member passes through the central axis, the X-direction plate member has a dimension in the X direction that is the inner diameter of the trunk body. When the Y-direction plate member passes through the central axis, the Y-direction plate member has a Y-direction dimension that is the inner diameter of the trunk body. With the above configuration, the basket according to the present invention can restrict movement of the X direction plate member and the Y direction plate member in the X direction and the Y direction on the inner peripheral surface of the trunk body.

  As a preferred aspect of the present invention, the X-direction plate-like member and the Y-direction plate-like member are formed to be recessed toward the radially outer side of the main body barrel on the inner peripheral surface, and in the central axis direction. It is desirable to be fitted in a groove extending toward the front.

  With the above configuration, the basket according to the present invention can restrict movement of the X direction plate member and the Y direction plate member in the X direction and the Y direction by the grooves.

  As a preferred aspect of the present invention, the X-direction plate-like member and the Y-direction plate-like member protrude from the respective end portions toward the circumferential direction of the inner peripheral surface and have the shape of the inner peripheral surface. It is desirable to form an engaging portion that is curved.

  Here, the both ends of the X-direction plate member and the Y-direction plate member are provided in contact with the inner peripheral surface of the trunk body. Therefore, the X-direction plate-like member and the Y-direction plate-like member are restricted from moving toward the lower side in the vertical direction on the inner peripheral surface. With the above configuration, the basket according to the present invention can restrict the movement of the X-direction plate-like member and the Y-direction plate-like member to the lower side in the vertical direction by the engaging portion.

  As a preferred aspect of the present invention, the structural member is a support member provided in a space generated between the square pipe group and the inner peripheral surface, and the X-direction plate member and the Y-direction plate member. Is preferably coupled to the support member. The support member is preferably provided in contact with the inner peripheral surface without being fixed to the inner peripheral surface.

  With the above configuration, the support member according to the present invention is not fixed to the inner peripheral surface of the trunk body. Accordingly, the support member can move in the X direction and the Y direction with respect to the inner peripheral surface of the trunk body.

  Therefore, even if there is a difference between the thermal expansion amount of the X-direction plate member and the Y-direction plate member attached to the support member and the thermal expansion amount of the trunk body, the basket according to the present invention has the X-direction plate. No thermal stress is generated on the contact surface between the cylindrical member and the Y-direction plate-shaped member and the inner peripheral surface of the trunk body, that is, the support member. Moreover, even if the said difference arises in the basket which concerns on this invention, a thermal stress does not arise in the connection part of a plate-shaped member and an attachment surface.

  As a preferred aspect of the present invention, the structural member is adjacent to the support member, which is the structural member provided in a space formed between the square pipe group and the inner peripheral surface, with a space therebetween. And a projecting portion projecting inward in the radial direction of the main body body and extending in the central axis direction on the inner peripheral surface, and the X-direction plate member and the Y-direction plate shape The member is preferably supported by being sandwiched between the support member and the protrusion.

  With the above configuration, the basket according to the present invention can move the X-direction plate member and the Y-direction plate member in the X direction and the Y direction without forming grooves in the side periphery of the trunk body, and the protrusion and support member. Can be regulated.

  The present invention can reduce the stress generated in the square pipe constituting the cell.

FIG. 1 is a perspective view showing a cask. FIG. 2 is a cross-sectional view of the basket of the first embodiment cut along an imaginary plane orthogonal to the cask center axis. FIG. 3 is a perspective view showing a state in which the X-direction plate member and the Y-direction plate member are combined. FIG. 4 is a perspective view showing the X-direction plate member and the Y-direction plate member welded to each other. FIG. 5 is a cross-sectional view showing the cask when the X-direction plate member and the Y-direction plate member are not attached to the trunk body. FIG. 6 is an enlarged cross-sectional view of an arcuate engagement portion formed on the plate-like member. FIG. 7 is a perspective view showing an X-direction plate member and a Y-direction plate member of Modification 2. FIG. 8 is a perspective view showing an X-direction plate-like member of Modification 3. FIG. 9 is a cross-sectional view showing the basket according to the second embodiment. FIG. 10 is an enlarged cross-sectional view of the second X-direction plate member. FIG. 11 is a cross-sectional view showing the basket of the third embodiment. FIG. 12 is an enlarged cross-sectional view of the first X-direction plate member according to the third embodiment. FIG. 13 is a perspective view showing a plate-like member according to the third embodiment. FIG. 14 is a perspective view showing a plate-like member of Modification 4. FIG. 15 is a cross-sectional view illustrating a protrusion according to the fourth embodiment.

  Hereinafter, embodiments of a basket and a cask according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a perspective view showing a cask. FIG. 2 is a cross-sectional view of the basket of the first embodiment cut along an imaginary plane orthogonal to the cask center axis. A cask 90 shown in FIG. 1 is a container for storing a fuel rod assembly.

  The cask 90 of this embodiment is a cask that stores a fuel rod assembly in which recycled fuel is bundled. The cask 90 includes a trunk body 91, a bottom 92, a lid 93, and the basket 10.

  The trunk body 91 is formed in a cylindrical shape. The bottom portion 92 is provided without a gap at one end portion of the trunk body 91. The lid portion 93 is provided at the other end of the trunk body 91 without a gap. The basket 10 is provided in a space surrounded by the trunk body 91, the bottom 92, and the lid 93. The basket 10 includes a plurality of cells 11. In the cask 90, a fuel rod assembly is stored in each cell 11.

  As shown in FIG. 2, the cell 11 is formed by a square pipe 12a. Here, in this embodiment, the square pipe 12a is a square pipe having a square cross section perpendicular to its central axis. In the basket 10, a plurality of cells 11 are configured by inserting a plurality of square pipes 12 a into the trunk body 91 in the direction of the central axis CL of the trunk body 91.

  Here, for convenience of explanation, one direction orthogonal to the central axis CL is defined as an X direction, and a direction orthogonal to the central axis CL and the X direction is defined as a Y direction. Of the four side surfaces of the square pipe 12a, a side surface orthogonal to the imaginary line along the X direction is referred to as a Y side surface 12ay, and a side surface orthogonal to the imaginary line along the Y direction is referred to as an X side surface 12ax.

  In the case of the cask 90 in which water is introduced into the basket 10, irregularities may be formed on the X side surface 12ax and the Y side surface 12ay. Thereby, in the basket 10, a flux trap is formed between the adjacent square pipes 12a, and a space for holding water can be secured.

  The square pipes 12a are regularly arranged in a row in the X direction, and the rows are arranged in the Y direction. Thereby, the basket 10 comprises the square pipe group 12 by the some square pipe 12a. In the present embodiment, the square pipe group 12 includes 24 square pipes 12a. Here, the shape of each square pipe 12a is the same, but for convenience of explanation, the 24 square pipes 12a are numbered 1 to 24 to be distinguished.

  Each square pipe 12a is composed of a first angle pipe 12a and a second angle pipe 12a in the first row, and the third angle pipe 12a is composed of a sixth angle pipe 12a in a second row, and from the seventh angle pipe 12a. The 12th angle pipe 12a constitutes the third row, the 13th angle pipe 12a to the 18th angle pipe 12a constitutes the fourth row, and the 19th angle pipe 12a to the 22nd angle pipe 12a constitutes the fifth row. The 23rd square pipe 12a and the 24th square pipe 12a constitute the sixth row.

  The No. 1 pipe 12a, the No. 3 pipe 12a, the No. 7 pipe 12a, the No. 13 pipe 12a, the No. 19 pipe 12a, and the No. 23 pipe 12a are arranged on the same side in the X direction. The Each square pipe 12a has a third row and a fourth row arranged radially inside the basket 10 in the Y direction, and a first row and sixth row arranged radially outside the basket 10 in the Y direction. It will be. The radially inner side of the basket 10 refers to the central axis CL side, and the radially outer side of the basket 10 refers to the trunk body 91 side.

  Here, in the case of the cask 90 into which water is introduced into the basket 10, a perforated plate for securing a space for holding water may be interposed between two adjacent square pipes 12a. The configuration and arrangement of the perforated plate vary depending on the cask 90. Therefore, in FIG. 2, the said perforated board is abbreviate | omitted and the inside of the basket 10 is shown typically.

  The basket 10 includes an X-direction plate member 13 and a Y-direction plate member 14. The X-direction plate member 13 and the Y-direction plate member 14 are made of, for example, an aluminum alloy. The widest surface of the X-direction plate member 13 is arranged in parallel to the X side surface 12ax of the square pipe 12a. Hereinafter, the widest surface among the surfaces of the plate-like member is referred to as a base surface. The base plate of the Y-direction plate member 14 is disposed in parallel to the Y side surface 12ay of the square pipe 12a.

  The X-direction plate-like member 13 and the Y-direction plate-like member 14 are disposed in the trunk body 91 including the central axis CL so as to pass through the central axis CL. Thereby, the X-direction plate member 13 and the Y-direction plate member 14 are orthogonal to each other on the central axis CL. Here, including the central axis CL means including two or more virtual points on the central axis CL.

  FIG. 3 is a perspective view showing a state in which the X-direction plate member and the Y-direction plate member are combined. Here, the configuration of the intersecting portion between the X-direction plate member 13 and the Y-direction plate member 14 will be described. As shown in FIG. 3, the X-direction plate-like member 13 is formed with an X-direction plate-like member-side notch 13 a. The Y-direction plate member 14 has a Y-direction plate member-side cutout portion 14a.

  The X-direction plate-like member-side notch 13a penetrates the X-direction plate-like member 13 in the thickness direction of the X-direction plate-like member 13, that is, in the Y direction. The Y-direction plate member-side cutout portion 14a penetrates the Y-direction plate member 14 in the thickness direction of the Y-direction plate member 14, that is, in the X direction.

  The X-direction plate member-side notch 13 a extends from the end portion on the Y-direction plate member 14 side of the end portion of the X-direction plate member 13 to the center of the X-direction plate member 13 in the central axis CL direction. It is formed by cutting in the direction of the central axis CL. The Y-direction plate member-side cutout portion 14 a extends from the end portion on the X-direction plate member 13 side of the end portion of the Y-direction plate member 14 to the center in the central axis CL direction of the Y-direction plate member 14. It is formed by cutting in the direction of the central axis CL.

  The dimension in the X direction of the X-direction plate member-side cutout 13 a is equal to or greater than the thickness of the Y-direction plate member 14. The dimension in the Y direction of the Y-direction plate member-side cutout portion 14 a is equal to or greater than the thickness of the X-direction plate member 13.

  The X-direction plate-like member 13 is inserted into the Y-direction plate-like member side cutout portion 14a from the end portion on the side where the X-direction platelike member side cutout portion 13a is formed. Further, the Y-direction plate-like member 14 is inserted into the X-direction plate-like member side cutout portion 13a from the end portion on the side where the Y-direction platelike member side cutout portion 14a is formed. In this way, the X-direction plate member 13 and the Y-direction plate member 14 are arranged in the trunk body 91 so as to be orthogonal to each other.

  FIG. 4 is a perspective view showing the X-direction plate member and the Y-direction plate member welded to each other. Here, the X-direction plate-like member 13 and the Y-direction plate-like member 14 are integrated with each other by being fitted into the X-direction plate-like member side cutout portion 13a and the Y-direction platelike member side cutout portion 14a. Moreover, as shown in FIG. 4, it may be integrated by welding.

  In this case, for example, as shown in FIG. 4, the Y-direction plate-like member 14 is composed of two pieces, a Y-direction deck-like member 15 and a Y-direction plate-like member 16. The Y-direction deck-like member 15 is welded with its end face butted against one of the two base surfaces of the Y-direction plate-like member 14. At this time, the Y-direction deck member 15 is perpendicular to the base surface of the X-direction plate member 13.

  The Y-direction plate-like member 16 is welded with its end face abutted against the other of the two base surfaces of the Y-direction plate-like member 14. At this time, the Y-direction plate-like member 16 is perpendicular to the base surface of the X-direction plate-like member 13. In this way, the X-direction plate member 13 and the Y-direction plate member 14 are arranged in the trunk body 91 so as to be orthogonal to each other.

  Here, the Y-direction plate-like member 14 may be welded to the X-direction plate-like member 13 before being arranged in the trunk main body 91, or after being arranged in the trunk main body 91, the X-direction plate-like member 14 may be X inside the trunk main body 91. The directional plate member 13 may be welded. However, the inner diameter of the trunk body 91 is generally about 1700 mm. Thereby, the welding operation becomes difficult inside the trunk body 91. Therefore, it is easier for the operator to weld the Y-direction plate-like member 14 and the X-direction plate-like member 13 before being placed in the trunk body 91.

  On the other hand, when the Y-direction plate-like member 14 and the X-direction plate-like member 13 are welded after being arranged in the trunk main body 91, the worker can use the X-direction plate-like member 13, the Y-direction plate-like member 14, and the like. Can be separately introduced into the body 91. Therefore, since the size of the structure to be handled in one operation is smaller than that in which the X-direction plate-like member 13 and the Y-direction plate-like member 14 are already integrated is introduced into the trunk body 91, the work A member can easily install the X-direction plate member 13 and the Y-direction plate member 14 in the trunk body 91.

  Therefore, in order to reduce the amount of work for workers, the basket 10 has a structure in which the X-direction plate-like member 13 and the Y-direction plate-like member 14 are fitted in notches formed with each other, as shown in FIG. Is preferred. In this case, the worker can separately introduce the X-direction plate member 13 and the Y-direction plate member 14 into the trunk body 91, and further, within the trunk body 91, the X-direction plate member 13 and the Y-direction plate There is no need to weld the shaped member 14. Therefore, the basket 10 can reduce the work amount of the worker more preferably.

  Next, a configuration for attaching the X-direction plate member 13 and the Y-direction plate member 14 to the trunk body 91 will be described. As shown in FIG. 2, the trunk body 91 has four grooves that are recessed toward the radially outer side of the trunk body 91 on the inner peripheral surface 91 a. The groove includes two X-direction plate member mounting grooves 17 and two Y-direction plate member mounting grooves 18.

  The two X-direction plate member mounting grooves 17 are formed to face each other at a portion of the inner peripheral surface 91a of the trunk body 91 where a virtual line in the X direction passing through the central axis CL intersects. The two Y-direction plate member mounting grooves 18 are formed on the inner peripheral surface 91a of the trunk body 91 so as to face each other at a portion that intersects a virtual line in the Y direction passing through the central axis CL. In this way, four grooves are formed on the inner peripheral surface 91a of the trunk main body 91 so as to be shifted by 90 degrees.

  The width of the X direction plate member mounting groove 17, that is, the dimension in the Y direction connecting the two wall surfaces constituting the X direction plate member mounting groove 17 is formed to be equal to or less than the thickness of the X direction plate member 13. . The width of the Y-direction plate member mounting groove 18, that is, the dimension in the X direction connecting the two wall surfaces constituting the Y-direction plate member mounting groove 18 is formed to be equal to or less than the thickness of the Y-direction plate member 14. .

  Here, the X-direction plate member 13 is formed such that the dimension in the X direction is equal to or less than the distance connecting the bottom surfaces of the two X-direction plate member mounting grooves 17. The Y-direction plate member 14 is formed such that the dimension in the Y direction is equal to or less than the distance connecting the bottom surfaces of the two Y-direction plate member mounting grooves 18. With this configuration, the X-direction plate member 13 is fitted into the trunk body 91 by being fitted into the X-direction plate member mounting groove 17. Further, the Y-direction plate member 14 is fitted in the Y-direction plate member mounting groove 18 and attached to the trunk body 91.

  Accordingly, the movement of the X-direction plate member 13 and the Y-direction plate member 14 within the trunk body 91 is restricted by the X-direction plate member mounting groove 17 and the Y-direction plate member mounting groove 18. The basket 10 is welded to the trunk body 91 when the X-direction plate member 13 and the Y-direction plate member 14 are installed on the trunk body 91. There is no need to Therefore, the basket 10 can reduce the work amount of the worker.

  Here, the width of the X direction plate member mounting groove 17 in the Y direction and the width of the Y direction plate member mounting groove 18 in the X direction are not the same as the thickness of the plate member fitted in each, It is preferable that the thickness is larger than the thickness of the plate member.

  Further, the X-direction plate member 13 is preferably formed so that the dimension in the X direction is not the same as the distance connecting the bottom surfaces of the two X-direction plate member mounting grooves 17 but smaller than the distance. The Y-direction plate-like member 14 is preferably formed so that the dimension in the Y-direction is not the same as the distance connecting the bottom surfaces of the two Y-direction plate-like member mounting grooves 18 but smaller than the distance.

  This is because the temperature inside the cask 90 rises when the fuel rod assembly is stored in the cask 90. When the temperature in the cask 90 rises, in the cask 90, the trunk main body 91, the X-direction plate member mounting groove 17 and the Y-direction plate member mounting groove 18 are thermally expanded.

  At this time, the body main body 91, the X-direction plate-shaped member mounting groove 17 and the Y-direction plate-shaped member mounting groove 18 have different thermal expansion coefficients, or the body main body 91 and the X-direction plate-shaped member mounting groove. When the amount of heat received by the 17 and the Y-direction plate member mounting groove 18 is different, the cask 90 is divided between the body 91, the X-direction plate member mounting groove 17 and the Y-direction plate member mounting groove 18. The amount of expansion is different.

  Thus, in the basket 10, the X-direction plate member 13 is fitted into the X-direction plate member mounting groove 17 without a gap, and the Y-direction plate member 14 is fitted into the Y-direction plate member mounting groove 18 without a gap. If they are combined, thermal stress is generated in the X-direction plate member 13 and the Y-direction plate member 14.

  However, the X-direction plate member 13 is fitted into the X-direction plate member mounting groove 17 with a predetermined expansion margin secured, and the Y-direction plate member 14 is inserted into the Y-direction plate member mounting groove 18. When the expansion allowance is secured and the basket 10 is fitted, even if the expansion amount differs between the trunk body 91, the X-direction plate member mounting groove 17 and the Y-direction plate member mounting groove 18, Thermal stress generated in the X-direction plate member 13 and the Y-direction plate member 14 can be reduced.

  The expansion allowance refers to the gap between the wall surface constituting the groove and the base surface constituting the plate member, and the gap between the bottom surface constituting the groove and the end surface constituting the plate member. It is. The size of the expansion allowance depends on, for example, the difference between the thermal expansion coefficient of the X-direction plate-like member 13 and the Y-direction plate-like member 14 and the thermal expansion coefficient of the trunk main body 91 and the assumed temperature in the cask 90. Is set.

  As described above, as shown in FIG. 2, the basket 10 is formed into four fan-shaped rooms by the X-direction plate member 13 whose base surface is along the X direction and the Y-direction plate member 14 whose base surface is along the Y direction. Divided. The basket 10 stores six square pipes 12a in each room. Thereby, the square pipe group 12 is divided into four in the basket 10. Next, the reason why the basket 10 can reduce the stress generated in the square pipe will be described.

  In the cask drop test, the cask 90 is caused to collide with the ground in a plurality of postures. Here, the stress generated in the square pipe 12a is particularly large when the cask 90 collides with the ground from the side. In this case, generally, the stress generated in the square pipe disposed on the radially outer side tends to be large.

  FIG. 5 is a cross-sectional view showing the cask when the X-direction plate member and the Y-direction plate member are not attached to the trunk body. As shown in FIG. 5, when the X-direction plate member and the Y-direction plate member are not attached to the trunk body, it is assumed that the cask drops in the Y direction from the 23rd and 12th pipes 12a and 12a, for example. Then, the 13th angle pipe 12a, the 19th angle pipe 12a, the 23rd angle pipe 12a, the 24th angle pipe 12a, the 22nd angle pipe 12a, and the 18th angle pipe 12a have respective vertical directions. The load of the square pipe and fuel rod assembly arranged on the upper side is loaded.

  In particular, the No. 23 pipe 12a and the No. 24 pipe 12a are each loaded with six square pipes and fuel rod assemblies. Therefore, assuming that the cask drops in the Y direction from the 23rd and 24th pipes 12a and 12a, the cask is composed of the 24th and 24th pipes of the 24 square pipes. Take the biggest impact.

  Further, assuming that the cask falls in the X direction from the 7th angle pipe 12a and the 13th angle pipe 12a side, the 7th angle pipe 12a and the 13th angle pipe 12a have six square pipes and fuel rods, respectively. Aggregate load is applied. Therefore, in this case, of the 24 square pipes, the cask has the greatest impact on the 7th and 13th pipes 12a and 12a.

  Assuming that the cask drops from the 19th angle pipe 12a side in the middle 45 degrees between the X direction and the Y direction, the 13th angle pipe 12a, the 19th angle pipe 12a and the 23rd angle pipe 12a are: Each of the five square pipes and the fuel rod assembly is loaded. Therefore, in this case, of the 24 square pipes, the 13th square pipe 12a, the 19th square pipe 12a, and the 23rd square pipe 12a receive the greatest impact.

  From the above, assuming that the side of the cask collides with the ground, the 1st angle pipe 12a and the 2nd angle pipe 12a, the 12th angle pipe 12a and the 18th angle pipe 12a, and the 23rd angle pipes 12a and 24 There is a risk that the numbered pipe 12a, the number 7 pipe 12a, and the number 13 pipe 12a receive the maximum six loads.

  However, in the basket 10 shown in FIG. 2, the X-direction plate-like member 13 and the Y-direction plate-like member 14 which are rigid bodies receive a part of the load of the square pipe 12a and the fuel rod assembly. Specifically, for example, assuming that the cask 90 falls in the Y direction from the 23rd square pipe 12a and the 24th square pipe 12a side, the basket 10 is disposed above the X direction plate-like member 13 in the vertical direction. The X-direction plate member 13 receives a load acting in the Y direction of the square pipe 12a and the fuel rod assembly.

  As a result, the basket 10 applies the load acting on each square pipe 12a to a maximum of the 9th square pipe 12a, the 10th square pipe 12a, the 23rd square pipe 12a, and the 24th square pipe 12a. The load on the square pipe 12a and the fuel rod assembly can be suppressed.

  Further, for example, assuming that the cask 90 falls in the X direction from the 7th and 12th angle pipes 12a and 12a, the basket 10 is arranged at an angle that is disposed above the Y direction plate member 14 in the vertical direction. The Y-direction plate member 14 receives a load acting in the Y direction of the pipe 12a and the fuel rod assembly. As a result, the basket 10 has a load acting on each of the square pipes 12a at the maximum, corresponding to two acting on the 10th square pipe 12a, the 16th square pipe 12a, the 7th square pipe 12a, and the 13th square pipe 12a. The load on the square pipe 12a and the fuel rod assembly can be suppressed.

  Further, for example, assuming that the cask 90 falls from the 19th angle pipe 12a side in the middle 45 degrees between the X direction and the Y direction, the basket 10 includes the X direction plate member 13 and the Y direction plate member 14. The X-direction plate-like member 13 and the Y-direction plate-like member 14 receive the load acting in the Y direction of the square pipe 12a and the fuel rod assembly arranged on the upper side in the vertical direction. Thereby, the basket 10 can suppress the load which acts on each square pipe 12a to the load of the two square pipes 12a and fuel rod assembly which act on the 7th square pipe 12a and the 24th square pipe 12a at the maximum. .

  Thus, the basket 10 is not limited to one posture, and even if it is assumed that the side surface of the cask 90 collides with the ground in a different posture, at least the X-direction plate member 13 and the Y-direction plate member 14 One receives the load of the square pipe 12a and the fuel assembly that are arranged vertically above the X-direction plate member 13 or the Y-direction plate member 14. Thereby, the basket 10 can reduce the stress which arises in the square pipe 12a.

  Here, the basket 10 can suppress each other's bending suitably because the X direction plate-shaped member 13 and the Y direction plate-shaped member 14 both pass the central axis CL. Specifically, for example, it is assumed that the cask 90 has dropped in the Y direction. At this time, if the Y-direction plate-like member 14 is not provided, the portion of the X-direction plate-like member 13 that passes through the central axis CL that is the central portion in the X direction is bent most vertically.

  However, the basket 10 is provided with the Y-direction plate-like member 14 at the center of the X-direction among the portions of the X-direction plate-like member 13. Thereby, the Y-direction plate member 14 receives a part of the load acting on the X-direction plate member 13. Thereby, the basket 10 can reduce the amount of bending of the X direction plate-shaped member 13.

(Modification 1)
FIG. 6 is an enlarged cross-sectional view of an arcuate engagement portion formed on the plate-like member. The basket 10 shown in FIG. 2 has a configuration in which the plate-like member is attached to the trunk body 91 by fitting the end of the plate-like member into a groove formed in the inner peripheral surface 91a of the trunk body 91. The basket 20 of the first modification is characterized in that a plate-like member is attached to the trunk body 91 without processing the inner peripheral surface 91a of the trunk body 91.

  As shown in FIG. 6, the X-direction plate member 21 and the Y-direction plate member 22 are disposed in the trunk body 91 including the central axis CL. Here, it is preferable that the X-direction plate-like member 21 is closer to the inner diameter of the trunk body 91 in the X direction. Further, the Y-direction plate-like member 22 is preferably as the dimension in the Y direction is closer to the inner diameter of the trunk body 91.

  When the dimension in the X direction of the X-direction plate-like member 21 is the same as the inner diameter of the trunk body 91, the movement of the X-direction plate-like member 21 is restricted by the inner peripheral surface 91a of the trunk body 91, and not only in the X direction. Cannot move in any direction. Further, when the Y-direction plate-like member 22 has the same Y-direction dimension as the inner diameter of the trunk body 91, the movement of the Y-direction plate-like member 22 is restricted by the inner peripheral surface 91 a of the trunk body 91. Cannot move in the X direction.

  As a result, the cask 90 can regulate the movement of the X direction plate member 21 and the Y direction plate member 22 in the X direction and the Y direction without forming a groove in the trunk body 91. Therefore, since the X-direction plate member 21 and the Y-direction plate member 22 do not move in the X direction and the Y direction, the basket 20 receives the X direction and Y received by the X direction plate member 21 and the Y direction plate member 22. The load in the direction is transmitted to the trunk body 91.

  Thereby, the basket 20 can reduce the load applied to the square pipe 12a arranged on the lower side in the vertical direction of the X direction plate member 21 and the Y direction plate member 22. Therefore, the basket 20 can reduce the stress generated in the square pipe 12a.

  In this case, it is not necessary to process the inner peripheral surface 91a of the trunk body 91 when manufacturing the basket 20. Therefore, the basket 20 can reduce the work amount and work time required to manufacture the cask 90.

  Here, in practice, it is difficult to process the dimension in the X direction of the X direction plate member 21 and the dimension in the Y direction of the Y direction plate member 22 to be the same as the inner diameter of the trunk body 91. 21 may be slightly formed between the end 21a of the 21 and the inner peripheral surface 91a, or between the end 22a of the Y-direction plate member 22 and the inner peripheral surface 91a. Further, when the inner peripheral surface 91a of the trunk body 91 expands larger than the plate-like member due to thermal expansion, a slight gap is generated between the end portions 21a and 22a and the inner peripheral surface 91a.

  Therefore, it is preferable that the basket 20 is formed with an arcuate engagement portion 23 shown in FIG. 6 at the end 21a and the end 22a. The arcuate engagement portion 23 formed on the X-direction plate member 21 is formed with an overhang portion 24 that projects from both base surfaces of the X-direction plate member 21 in the Y direction.

  The arcuate engagement portion 23 formed on the Y-direction plate-like member 22 is formed with an overhang portion 25 that projects from both base surfaces of the Y-direction plate-like member 22 in the X direction. The arc-shaped engaging portion 23 is formed such that a surface facing the trunk body 91 is curved in an arc shape along the inner peripheral surface 91 a of the trunk body 91.

  Thus, the basket 20 has a contact area between the X-direction plate-like member 21 and the Y-direction plate-like member 22 and the inner peripheral surface 91a of the trunk body 91, so that the overhang portion 24 and the overhang portion 25 are formed. To increase. Therefore, in the basket 20, the frictional force between the end portions 21 a and 22 a and the inner peripheral surface 91 a of the trunk body 91 increases. As a result, the basket 20 can more suitably regulate the movement of the X-direction plate member 21 and the Y-direction plate member 22 in the X direction and the Y direction.

(Modification 2)
FIG. 7 is a perspective view showing an X-direction plate member and a Y-direction plate member of Modification 2. The basket 30 of the second modification shown in FIG. 7 is characterized in that holes are formed in the X-direction plate member 31 and the Y-direction plate member 32.

  As described above, the cask 90 may be interposed between the square pipes 12a with which the perforated plates for securing a space for holding water are adjacent to each other. Therefore, when storing the same number of square pipes 12a in the cask 90 in the same number, the larger the number of the perforated plates arranged, the larger the inner diameter of the trunk body 91 needs to be formed. As a result, the cask becomes larger.

  Therefore, in the basket 30, a through hole 33 is formed in the X direction plate member 31, and a through hole 34 is formed in the Y direction plate member 32. The through hole 33 is, for example, a hole that penetrates the X-direction plate member 31 in the Y direction. The through hole 34 is, for example, a hole that penetrates the Y-direction plate member 32 in the X direction.

  As a result, the cask 90 can be arranged in the X direction even if a porous plate for securing a space for holding water is not disposed between the X direction plate member 31 and the Y direction plate member 32 and the square pipe 12a. The plate-like member 31 and the Y-direction plate-like member 32 can secure a space for holding water. Thereby, the basket 30 can reduce the number of the perforated plates with which the cask 90 is provided in order to ensure the space holding water. Therefore, the basket 30 can suppress the enlargement of the cask 90.

  Here, the direction in which the through-hole 33 and the through-hole 34 penetrate the plate-like member is not limited to the X direction and the Y direction, and may be any hole that can secure a space for holding water. Further, as shown in FIG. 7, in the basket 30, a communication hole 35 that communicates through holes that are adjacent in the direction of the central axis CL may be formed in the X-direction plate member 31 and the Y-direction plate member 32. In this case, the basket 30 can introduce water into the cask 90 more quickly and can discharge water from the cask 90 more quickly.

(Modification 3)
FIG. 8 is a perspective view showing an X-direction plate-like member of Modification 3. The basket 40 of the third modification shown in FIG. 8 is characterized in that the plate-like members are divided into a plurality and are arranged alternately. The basket 40 includes a plurality of X direction division plate members 41 and a plurality of Y direction division plate members 42.

  In the basket 40, a plurality of X-direction division plate-like members 41 and a plurality of Y-direction division plate-like members 42 are alternately stacked in the direction of the central axis CL and arranged in the trunk body. That is, in the basket 40, the Y-direction divided plate-like member 42 is disposed between the adjacent X-direction divided plate-like members 41, and the X-direction divided plate-like member 41 is located between the adjacent Y-direction divided plate-like members 42. Is placed.

  Accordingly, the basket 40 does not include the X-direction plate member-side notch portion 13a and the Y-direction plate member-side notch portion 14a formed in the X-direction plate member 13 and the Y-direction plate member 14 shown in FIG. In addition, the X-direction divided plate-like member and the Y-direction divided plate-like member can be orthogonal to each other.

  4, the X-direction plate member 13 and the Y-direction plate member 14 are welded, but the basket 40 is not welded to the X-direction plate member and the Y-direction plate plate. The members can be orthogonal to each other. Thereby, the basket 40 can reduce the amount of work required for forming the X-direction plate-like member side cutout portion 13a and the Y-direction plate-like member side cutout portion 14a.

  Further, in the basket 40, one X-direction division plate member 41 and one Y-direction division plate member 42 are smaller than the X-direction plate member 13 and the Y-direction plate member 14 shown in FIGS. Become. Thereby, when installing the X direction division | segmentation plate-shaped member 41 and the Y direction division | segmentation plate-like member 42 in the trunk | drum main body 91, since the magnitude | size of the structure handled by one operation | work becomes small, an operator can do it easily. The X-direction division plate member 41 and the Y-direction division plate member 42 can be installed in the trunk body 91.

  Further, as shown in FIG. 8, the basket 40 has a gap between the plate-like members except for the portion where the X-direction divided plate-like member 41 and the Y-direction divided plate-like member 42 are in contact with each other. Specifically, in the basket 40, a gap corresponding to the dimension in the central axis CL direction of the Y-direction divided plate-like member 42 is generated between the X-direction divided plate-like members 41 adjacent to each other. In the basket 40, a gap corresponding to the dimension in the central axis CL direction of the X-direction divided plate member 41 is generated between the Y-direction divided plate-like members 42 adjacent to each other.

  In the basket 40, the gap serves as a water flow path. Thereby, the basket 40 can ensure the flow path of water in the gap even if the X-direction divided plate-like member 41 and the Y-direction divided plate-like member 42 are not formed with through holes. Therefore, the basket 40 can reduce the work amount for forming the through hole.

  In addition, the basket 40 can secure a water flow path in the gap even if it does not include a perforated plate. Therefore, the basket 40 can reduce the number of perforated plates included in the cask 90 in order to secure a water flow path. Thereby, the basket 40 can suppress the enlargement of the cask 90.

  In addition, the basket 40 has a smaller overall weight than the basket 10 shown in FIGS. 3 and 4 because the gap is provided in the X direction divided plate member 41 and the Y direction divided plate member 42. Thereby, the basket 40 can reduce the weight of the cask 90.

(Embodiment 2)
FIG. 9 is a cross-sectional view showing the basket according to the second embodiment. The basket 50 shown in FIG. 9 is characterized in that it includes four plate-like members. The basket 50 includes a first X-direction plate member 51, a second X-direction plate member 52, a first Y-direction plate member 53, and a second Y-direction plate member 54.

  The base surfaces of the first X-direction plate member 51 and the second X-direction plate member 52 are provided in parallel with the X side surface 12ax of the square pipe 12a. The first X-direction plate-like member 51 and the second X-direction plate-like member 52 are arranged with an interval corresponding to two square pipes 12a in the Y direction.

  The base surfaces of the first Y-direction plate member 53 and the second Y-direction plate member 54 are provided in parallel with the Y side surface 12ay of the square pipe 12a. The first Y-direction plate-like member 53 and the second Y-direction plate-like member 54 are arranged with an interval corresponding to two square pipes 12a in the X direction.

  The first X-direction plate member 51 and the second X-direction plate member 52 and the first Y-direction plate member 53 and the second Y-direction plate member 54 are orthogonal to each other. Here, a portion where the first X-direction plate-like member 51 and the second X-direction plate-like member 52 and the first Y-direction plate-like member 53 and the second Y-direction plate-like member 54 are orthogonal to each other is a notch as shown in FIG. 4 may be realized, or may be realized by welding the plate-like members to each other as shown in FIG. 4, or a plurality of X-direction plates as shown in FIG. This may be realized by alternately providing the plate-like member and the plate-like member in the Y direction in the central axis CL direction.

  In the present embodiment, the first X-direction plate member 51, the first Y-direction plate member 53, the second X-direction plate member 52, and the second Y-direction plate member 54 are as shown in FIG. An end portion is fitted into a groove formed in the inner peripheral surface 91 a of the main body 91 and attached to the trunk main body 91. As a result, the basket 50 includes the first X-direction plate member 51, the first Y-direction plate member 53, the second X-direction plate member 52, and the second Y-direction plate member 54, and the square pipe group 12 has nine. Divided into two.

  The basket 50 is stored in a single room, one for each of the No. 3 pipe 12a, No. 6 pipe 12a, No. 19 pipe 12a, and No. 22 pipe 12a.

  In addition, the basket 50 stores the first square pipe 12a, the second square pipe 12a, the fourth square pipe 12a, and the fifth square pipe 12a in one room. Further, in the basket 50, the 7th angle pipe 12a, the 8th angle pipe 12a, the 13th angle pipe 12a, and the 14th angle pipe 12a are stored in one room.

  In addition, in the basket 50, the 9th angle pipe 12a, the 10th angle pipe 12a, the 15th angle pipe 12a, and the 16th angle pipe 12a are stored in one room. Further, in the basket 50, an 11th angle pipe 12a, a 12th angle pipe 12a, a 17th angle pipe 12a, and an 18th angle pipe 12a are stored in one room. In addition, in the basket 50, a No. 20 pipe, a No. 21, pipe, a No. 23 pipe, and a No. 24 pipe are stored in one room.

  Thereby, the basket 50 is not limited to one direction, and even if it receives an impact from a different direction, the load acting on the square pipe 12a becomes a single square pipe 12a and a fuel rod assembly. Therefore, the basket 50 can reduce the stress which arises in the square pipe 12a more suitably.

  However, as shown in FIG. 2, even if the basket is configured to include only the X-direction plate member 13 and the Y-direction plate member 14, the stress generated in the square pipe 12a can be sufficiently reduced. Therefore, when the purpose is to reduce the stress generated in the square pipe 12a while reducing the size of the cask 90, the basket includes only the X-direction plate member 13 and the Y-direction plate member 14 as shown in FIG. The structure provided is preferable. In this case, the basket can reduce the size of the cask 90 as much as the number of plate members provided is reduced.

  FIG. 10 is an enlarged cross-sectional view of the second X-direction plate member. Hereinafter, when the first X-direction plate-like member, the second X-direction plate-like member, the first Y-direction plate-like member, and the second Y-direction plate-like member 54 are not distinguished, they are collectively referred to as a plate-like member.

  Here, in the basket 50, both ends 55 of the plate-like member are in contact with the inner peripheral surface 91 a of the trunk main body 91 as shown in FIG. 9 even if no groove is formed in the inner peripheral surface 91 a of the trunk main body 91. If it is a structure, the stress which arises in the square pipe 12a can be reduced. For example, it is assumed that the cask 90 collides with the ground from the 23rd and 24th sides.

  Here, if both end portions 55 in the X direction are in contact with the inner peripheral surface 91 a of the trunk main body 91, the movement of the basket 50 is restricted by the inner peripheral surface 91 a of the trunk main body 91 and the second X-direction plate-like member 52. However, it does not move further downward in the vertical direction. Therefore, in the basket 50, the first X-direction plate-like member 51 receives the load of the square pipe 12 a and the fuel rod absorber disposed on the upper side in the vertical direction than the second X-direction plate-like member 52.

  Thereby, the basket 50 can reduce the load applied to No. 23 and No. 24 arrange | positioned most vertically below. Therefore, the basket 50 can reduce the stress generated in the square pipe 12a.

  Further, the basket 50 is preferably formed with an overhanging portion as shown in FIG. 6 at the end of the plate-like member. Thereby, the friction force between the said edge part and the trunk | drum main body 91 increases the basket 50. FIG. Therefore, the basket 50 can suppress the movement of the plate-like member downward in the vertical direction more suitably.

  The basket 50 may have a configuration in which only two X-direction plate members are provided, for example. In this case, the basket 50 has an increased number of square pipe groups 12 divided in the Y direction. Therefore, the basket 50 can more suitably reduce the load applied to each square pipe 12a when it is assumed that the cask collides with the ground in the Y direction. Accordingly, the basket 50 can more suitably reduce the stress generated in the square pipe 12a.

(Embodiment 3)
FIG. 11 is a cross-sectional view showing the basket of the third embodiment. A basket 60 shown in FIG. 11 is characterized in that a plate-like member is connected to a support. The support member 65 is a member for filling a space generated between the square pipe 12 a and the inner peripheral surface 91 a of the trunk main body 91. The support member 65 regulates the movement of the square pipe 12 a in the trunk body 91 and transmits heat in the basket 60 to the trunk body 91.

  For example, eight support members 65 are provided. For convenience of explanation, the eight support members 65 are identified by being numbered S1 to S8. As for the support member 65, the S1 support member 65 is adjacent to the first angle pipe 12a in the X direction, the S2 support member 65 is adjacent to the second angle pipe 12a in the X direction, and the S3 support member 65 is the 12th angle. The S12 support member 65 is adjacent to the 18th angle pipe 12a in the Y direction, the S5 support member 65 is adjacent to the 24th angle pipe 12a in the X direction, and the S6 support member 65 is adjacent to the pipe 12a in the Y direction. Is adjacent to the 23rd angle pipe 12a in the X direction, the S7 support member 65 is adjacent to the 13th angle pipe 12a in the Y direction, and the S8 support member 65 is adjacent to the 7th angle pipe 12a in the Y direction. Is done.

  The basket 60 includes a first X-direction plate member 61, a second X-direction plate member 62, a first Y-direction plate member 63, and a second Y-direction plate member 64. The first X-direction plate member 61 and the second X-direction plate member 62 are disposed in parallel to the X side surface 12ax of the square pipe 12a. The first Y-direction plate member 63 and the second Y-direction plate member 64 are disposed in parallel to the Y side surface 12ay of the square pipe 12a.

  The first X-direction plate-like member 61 is connected to the mounting surface 65a on the central axis CL side of the S1 support member 65 and the mounting surface 65a on the central axis CL side of the S2 support member 65. The second X-direction plate-like member 62 is connected to the mounting surface 65a on the central axis CL side of the S5 support member 65 and the mounting surface 65a on the central axis CL side of the S6 support member 65.

  The first X-direction plate-like member 61 only needs to be in contact with the S1 support member 65 and the S2 support member 65, and is not necessarily connected to the S1 support member 65 and the S2 support member 65. It does not have to be. The second X-direction plate-like member 62 only needs to be in contact with the S5 support member 65 and the S6 support member 65, and is not necessarily connected to the S5 support member 65 and the S6 support member 65. May be.

  The first Y-direction plate member 63 is connected to the mounting surface 65a on the central axis CL side of the S7th support member 65 and the mounting surface 65a on the central axis CL side of the S8th support member 65. The second Y-direction plate member 64 is connected to the mounting surface 65a on the central axis CL side of the S3 support member 65 and the mounting surface 65a on the central axis CL side of the S4 support member 65.

  The first Y-direction plate-like member 63 only needs to be in contact with the S7 support member 65 and the S8 support member 65, and is not necessarily connected to the S7 support member 65 and the S8 support member 65. It does not have to be. Further, the second Y-direction plate member 64 only needs to be in contact with the S3 support member 65 and the S4 support member 65, and is not necessarily connected to the S4 support member 65 and the S4 support member 65. May be.

  Thereby, the basket 60 includes the first X-direction plate-like member 61, the second X-direction plate-like member 62, the first Y-direction plate-like member 63, and the second Y-direction plate-like member 64. Divided into two.

  Specifically, in the basket 60, the No. 1 pipe 12a and the No. 2 pipe 12a are stored in one room, and the No. 12 pipe 12a and the No. 18 pipe 12a are stored in one room. The pipe 12a and the 24th angle pipe 12a are stored in one room, the 7th angle pipe 12a and the 13th angle pipe 12a are stored in one room, and the other square pipes 12a are stored in one room.

  FIG. 12 is an enlarged cross-sectional view of the first X-direction plate member according to the third embodiment. Here, as shown in FIG. 12, a curved surface facing the inner peripheral surface 91a of the trunk body 91 among the surfaces of the support member 65 is defined as an engagement surface 65b. In the basket 60, both the engagement surfaces 65 b of the support members 65 disposed at both ends of the plate-shaped member are in contact with the inner peripheral surface 91 a of the trunk body 91 in a state where the square pipe 12 a is disposed in the trunk body 91. Configured to do.

  The second X-direction plate member 62 will be described as an example. Specifically, in a state where the two engagement surfaces 65b are in contact with the inner peripheral surface 91a of the trunk body 91, the second X-direction plate member 62 is parallel to the second X-direction plate member 62; A tangent line in contact with the inner peripheral surface 91a of the trunk body 91 is defined as a reference line VL. The distance from the mounting surface 65a to the reference line VL is the distance L01, and the X side surface 12ax of the 23rd angle pipe 12a or 24th angle pipe 12a of the X side surface 12ax facing the second X direction plate member 62 is the reference line. Let the distance to VL be the distance L02. The basket 60 is formed such that the distance L01 is greater than or equal to the distance L02.

  Accordingly, assuming that the cask 90 collides with the ground in the Y direction from the 23rd and 24th pipes 12a and 12a, the vertical downward load received by the first X-direction plate member 61 is 23. It is transmitted to the trunk body 91 without being transmitted to the number pipe 12a and the number 24 pipe 12a. Thereby, the basket 60 can reduce the stress which generate | occur | produces in the 23rd angle pipe 12a and the 24th angle pipe 12a.

  Here, the support member 65 is not fixed to the inner peripheral surface 91 a of the trunk body 91. Accordingly, the support member 65 can move in the X direction and the Y direction with respect to the inner peripheral surface 91a of the trunk body 91.

  Therefore, even if there is a difference between the thermal expansion amount of the plate member attached to the support member 65 and the thermal expansion amount of the trunk body 91, the basket 60 is in contact with the plate member and the inner peripheral surface 91a of the trunk body 91. No thermal stress is generated on the surface, that is, the support member 65. Moreover, even if the said difference arises in the basket 60, a thermal stress does not arise in the connection part of a plate-shaped member and the attachment surface 65a.

  As described above, the basket 60 can reduce the stress generated in the plate member by the support member 65 not fixed to the trunk body 91 supporting the plate member.

  Here, as shown in FIG. 11, in the basket 60, the first X-direction plate member 61 and the second X-direction plate member 62, and the first Y-direction plate member 63 and the second Y-direction plate member 64 do not intersect. . Therefore, the basket 60 does not have to be formed in the plate-like member with the notches shown in FIGS. 3 and 7.

  Moreover, although the plate-shaped members of the basket 10 shown in FIG. 4 are welded to each other, the basket 60 does not need to be welded to the plate-shaped members. Further, in the basket 40 shown in FIG. 8, the X-direction divided plate-like member 41 and the Y-direction divided plate-like member 42 are alternately arranged in the central axis CL direction, but the basket 60 has two types orthogonal to each other. It is not necessary that the plate-like members are alternately arranged in the central axis CL direction.

  Therefore, the work of forming the notch, the work of welding the plate-like members, and the work of alternately arranging two kinds of plate-like members orthogonal to each other in the central axis CL direction can be omitted. The amount of work for workers can be reduced.

  Specifically, in the basket 60, for example, a single plate-like member is attached to the attachment surface 65a in advance. Next, in the basket 60, the two support members 65 and the plate member are integrally introduced into the trunk body 91. The worker can arrange the plate-like member and the support member 65 in the trunk main body 91 only by the above work.

  Here, the basket 60 is not limited to a configuration in which one plate-like member is attached to the support member 65. The basket 60 may be configured, for example, by dividing a plate-like member into a plurality of plates. Specific examples will be described below.

  FIG. 13 is a perspective view showing a plate-like member according to the third embodiment. As shown in FIG. 13, the basket 60 includes a plurality of divided plate members 66. The plurality of divided plate-like members 66 are all provided in parallel to the X side surface 12ax or the Y side surface 12ay. In the present embodiment, the plurality of divided plate-like members 66 are all provided with their respective base surfaces parallel to the X side surface 12ax.

  The divided plate-like members 66 are arranged side by side in the direction of the central axis CL so that their end faces come into contact with each other. Therefore, in the basket 60, a plurality of divided plate members 66 gather to form one X-direction plate member. Thereby, since the size of the structure handled by one operation | work becomes small, an operator can handle a plate-shaped member easily.

  Moreover, generally the magnitude | size of the plate-shaped member marketed is limited, and it is necessary to manufacture a large sized plate-shaped member specially. Therefore, when the size of the divided plate-like member 66 is formed to be equal to or smaller than the size of the commercially available plate-like member, the materials for constituting the basket 60 can be easily arranged.

  More preferably, as shown in FIG. 13, the divided plate-like member 66 is formed with a convex engagement portion 67 and a concave engagement portion 68. The convex engagement portion 67 and the concave engagement portion 68 are formed in shapes that engage with each other. The convex engagement portion 67 is formed on, for example, the end surface on the lid portion 93 side among the end surfaces of the divided plate member 66. The concave engagement portion 68 is formed on, for example, the end surface on the bottom portion 92 side of the end surface of the divided plate member 66.

  Thus, in the basket 60, the convex engagement portion 67 of the divided plate-like member 66 and the concave engagement portion 68 that are adjacent to each other in the central axis CL direction are engaged with each other. Therefore, the basket 60 can connect the divided plate-like members 66 adjacent to each other in the central axis CL direction.

(Modification 4)
FIG. 14 is a perspective view showing a plate-like member of Modification 4. As shown in FIG. 14, the basket 70 of Modification 4 is characterized in that the divided plate-like member 71 includes a holed divided plate-like member 72.

  The perforated divided plate member 72 has a through hole 74 formed therein. The direction and shape of the through hole 74 are not limited as long as water can flow through the through hole 74. In the present embodiment, the through hole 74 is formed in the X direction along the base surface of the holed divided plate member 72.

  In the basket 70, the through hole 74 serves as a water flow path. Thereby, the basket 70 can ensure the flow path of the water with the perforated divided plate member 72 without separately providing a porous plate. Therefore, the basket 70 can reduce the number of perforated plates included in the cask 90 in order to secure a water flow path. Thereby, the basket 40 can suppress the enlargement of the cask 90.

  Here, the basket 70 may be formed by aggregating only the plurality of holed divided plate members 72 to form a plate member. For example, as shown in FIG. The non-divided plate member 73 may be combined.

  The perforated divided plate member 72 is a solid member. In this case, for example, as shown in FIG. 14, the basket 70 is configured such that the perforated divided plate-like members 72 and the non-perforated divided plate-like members 73 are alternately arranged in the central axis CL direction.

  If the perforated divided plate-like member 72 and the non-perforated plate-like member 73 are made of the same material, the non-perforated divided plate-like member 73 is more rigid than the perforated divided plate-like member 72 because the through-hole 74 is not formed. Is expensive. Therefore, the basket 70 can suppress a reduction in the rigidity of the plate-like member by including the hole-free divided plate-like member 73 having higher rigidity than the holed divided plate-like member 72 and configuring the plate-like member.

  Further, when manufacturing the hole-free divided plate-like member 73, the operator does not need to form the through-hole 74. Therefore, the amount of work required for manufacturing the basket 70 can be reduced because the work for forming the through hole 74 is not necessary.

(Embodiment 4)
FIG. 15 is a cross-sectional view illustrating a protrusion according to the fourth embodiment. The basket 80 according to the fourth embodiment shown in FIG. 15 is characterized in that a projection 83 is newly attached to the inner peripheral surface 91a of the trunk body 91, and the projection 83 and the support member 65 support the plate-like member. .

  The projecting portion 83 includes three side surfaces including a first plane 83a, a second plane 83b, and a curved surface 83c. The protrusion 83 is formed in a fan shape with a cross-sectional shape orthogonal to the central axis CL having a central angle of 90 degrees. The protrusion 83 is attached with the curved surface 83 c in contact with the inner peripheral surface 91 a of the trunk body 91, for example.

  For example, four protrusions 83 are provided. The protrusion 83 is provided between the support members 65 adjacent to each other. Since the configuration of the projection 83 is the same, the configuration of the projection 83 formed between the S4th support member 65 and the S5th support member 65 will be described here.

  The first plane 83a is a plane parallel to the X side surface 12ax. The second plane 83b is a plane parallel to the Y side surface 12ay. The first plane 83a faces the facing surface 65c, which is one of the surfaces of the S4th support member 65, with a gap in the X direction. The interval is not less than the thickness of the second X-direction plate member 81. The second plane 83b faces the facing surface 65c, which is one of the surfaces of the S5th support member 65, with a gap in the Y direction. The interval is not less than the thickness of the second Y-direction plate member 82.

  Thereby, the 2nd X direction plate-shaped member 81 is pinched | interposed between the 1st plane 83a and the opposing surface 65c of the S4th support member 65, and is supported. The second Y-direction plate member 82 is supported by being sandwiched between the second plane 83b and the facing surface 65c of the S5 support member 65.

  As described above, the basket is not limited to the configuration in which the groove is formed in the inner peripheral surface 91a of the trunk main body 91, and the configuration including the protrusion 83 that protrudes from the inner peripheral surface 91a of the trunk main body 91 toward the central axis CL. A plate-like member can be supported in the trunk body 91.

  As described above, the basket and the cask according to the present invention are useful for the technique of storing the fuel rod assembly more safely when it is assumed that an impact is transmitted to the cask, and in particular, the square pipe constituting the cell. It is suitable for reducing the generated stress.

10 to 80 Basket 11 Cell 12 Square pipe group 12a Square pipe 12ax X side surface 12ay Y side surface 13, 21, 31 X direction plate member 13a X direction plate member side cutout portion 14, 22, 32 Y direction plate member 14a Y Directional plate-like member side cutout portion 15 Y-direction deck-like member 16 Y-direction plate-like member 17 X-direction plate-like member attachment groove 18 Y-direction plate-like member attachment groove 21a, 22a End portion 23 Arc-shaped engagement portion 24 , 25 Overhang portion 33, 34, 74 Through hole 35 Communication hole 41 X-direction divided plate-like member 42 Y-direction divided plate-like member 45 Intermediate 51, 61 First X-direction plate-like member 52, 62 Second X-direction plate-like member 53 63 First Y-direction plate-like member 54, 64, 81, 82 Second Y-direction plate-like member 55 Both ends 65 Support member 65a Mounting surface 65b Engagement surface 65c Opposing surface 66, 71 minutes Plate-like member 67 Convex-type engaging portion 68 Concave-type engaging portion 72 Hole-equipped divided plate-like member 73 Hole-less divided plate-like member 83 Projection portion 83a First plane 83b Second plane 83c Curved surface 90 Cask 91 Body main body 91a Inner peripheral surface 92 Bottom 93 Lid CL Central axis L01, L02 Distance VL Reference line

Claims (13)

A group of square pipes configured by arranging a plurality of square pipes inside the trunk body of the cask,
An X-direction plate-like member that is provided in parallel with the central axis of the trunk body and divides the square pipe group into a plurality of parts;
A Y-direction plate-like member that is parallel to the central axis and orthogonal to the first-direction plate-like member, and further divides the square pipe group into a plurality of pieces;
A basket comprising: The square pipe includes an X side surface and a Y side surface orthogonal to the X side surface,
The square pipe group includes an X direction which is parallel to the X side surface and perpendicular to the central axis of the trunk main body, and a Y direction which is parallel to the Y side surface and perpendicular to the central axis. And arranged in two directions,
The X-direction plate-like member is provided between the X side surfaces facing each other among the side surfaces of the adjacent square pipes, and is provided at both ends facing the inner peripheral surface of the trunk body. The part contacts the inner peripheral surface or the structural member in contact with the inner peripheral surface,
The Y-direction plate-like member is provided between the Y side surfaces facing each other among the side surfaces of the adjacent square pipes, and is provided in parallel to the Y side surface, and both end portions facing the inner peripheral surface are The basket according to claim 1, wherein the basket contacts an inner peripheral surface or the structural member. The X-direction plate member is
A first X-direction plate member;
A second X-direction plate-like member arranged at an interval in the first X-direction plate-like member and the Y-direction;
The basket according to claim 2, comprising two pieces. The Y-direction plate member is
A first Y-direction plate member;
The first Y-direction plate-like member and the second Y-direction plate-like member arranged at an interval in the X direction;
The basket according to claim 3, wherein the basket is composed of two pieces.   The square pipe group is divided into five by the first X-direction plate member, the second X-direction plate member, the first Y-direction plate member, and the second Y-direction plate member. The basket according to claim 4.   Nine square pipe groups with the first X direction plate member, the second X direction plate member, the first Y direction plate member, the second Y direction plate member, and the inner peripheral surface. The basket according to claim 4, wherein the basket is divided into two parts. The basket according to claim 2, wherein the trunk body is formed in a cylindrical shape, and the X-direction plate-like member and the Y-direction plate-like member are provided through a central axis of the trunk body. The X-direction plate member and the Y-direction plate member are
8. The method according to claim 2, wherein the inner peripheral surface is formed to be recessed toward the outer side in the radial direction of the main body body, and is fitted into a groove extending toward the central axis direction. The basket as described in any one. The X-direction plate member and the Y-direction plate member are
3. An engagement portion that is formed to protrude in the circumferential direction of the inner peripheral surface and to be curved into the shape of the inner peripheral surface is formed at each of the both end portions. Item 8. The basket according to any one of Items 7. The structural member is
A support member provided in a space generated between the square pipe group and the inner peripheral surface;
The X-direction plate member and the Y-direction plate member are
The basket according to any one of claims 2 to 7, wherein the basket is connected to the support member.   The basket according to claim 10, wherein the support member is provided in contact with the inner peripheral surface without being fixed to the inner peripheral surface. The structural member is
A support member which is the structural member provided in a space generated between the square pipe group and the inner peripheral surface;
A protrusion that is adjacent to the support member at a distance, protrudes radially inward of the main body to the inner peripheral surface, and extends toward the central axis;
And
The X direction plate member and the Y direction plate member are supported by being sandwiched between the support member and the protrusion. The basket described. A trunk body formed in a cylindrical shape;
A bottom provided at one end of the trunk body;
A lid provided at the other end of the trunk body;
A group of square pipes configured by arranging a plurality of square pipes inside the trunk body;
An X-direction plate-like member that is provided in parallel with the central axis of the trunk body and divides the square pipe group into a plurality of parts;
A Y-direction plate-like member that is parallel to the central axis and orthogonal to the first-direction plate-like member, and further divides the square pipe group into a plurality of pieces;
A cask characterized by comprising:

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