Basket, method for assembling the basket, and radioactive material storage container

Abstract

To improve the strength of the basket, the method for assembling the basket, and the radioactive material storage container. [Solution] A basket comprising a plurality of storage compartments for storing radioactive material, comprising: a plurality of first plate-shaped members arranged at intervals in the thickness direction; a plurality of second plate-shaped members arranged at intervals in the thickness direction and combined in a direction perpendicular to the plurality of first plate-shaped members; a plurality of first support members supporting the longitudinal ends of some of the first plate-shaped members; and a plurality of second support members supporting the longitudinal ends of some of the second plate-shaped members.

Description

Technical Field

[0001] The present disclosure relates to a basket, a method for assembling the basket, and a radioactive substance storage container.

Background Art

[0002] At nuclear facilities, radioactive waste such as spent fuel generated in a nuclear reactor or the like is stored in a radioactive substance storage container (cask), transported to a storage facility, a reprocessing facility, or the like, and stored or reprocessed. The radioactive substance storage container includes a cylindrical body portion having a bottom and an open top, and a lid portion fixed to the upper portion of the body portion to close the opening. Further, a basket capable of storing a plurality of radioactive wastes is disposed inside the body portion of the radioactive substance storage container.

[0003] The basket is configured by combining a plurality of plate-like members in a lattice pattern. That is, the basket is configured by combining a plurality of first plate-like members arranged at intervals in the plate thickness direction and a plurality of second plate-like members arranged at intervals in the plate thickness direction in orthogonal directions. The basket forms a plurality of cells capable of storing radioactive waste by assembling a plurality of plate-like members in a lattice pattern. Such a basket is, for example, the one described in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Radioactive material storage containers must maintain safety functions (criticality prevention, shielding, heat removal, and containment) against events foreseeable in their design, and must also ensure structural strength to guarantee these safety functions. The basket is constructed by assembling multiple plate-like members in a grid pattern, and in this assembled state, it is placed inside the radioactive material storage container. The radioactive material storage container stores radioactive waste in multiple cells provided in the basket. Radioactive material storage containers may tip over during storage due to earthquakes or fall during transport. It is preferable that the basket has a structure that is resistant to damage when the radioactive material storage container tips over or falls.

[0006] This disclosure aims to solve the aforementioned problems and to provide a basket with improved strength, a method for assembling the basket, and a radioactive material storage container. [Means for solving the problem]

[0007] To achieve the above objective, the basket of the present disclosure comprises a basket partitioned into a plurality of storage compartments for storing radioactive material, a plurality of first plate-shaped members arranged at intervals in the thickness direction, a plurality of second plate-shaped members arranged at intervals in the thickness direction and combined in a direction perpendicular to the plurality of first plate-shaped members, a plurality of first support members supporting the longitudinal ends of some of the first plate-shaped members, and a plurality of second support members supporting the longitudinal ends of some of the second plate-shaped members.

[0008] Furthermore, the basket assembly method of this disclosure is a method for assembling a basket in which a plurality of storage compartments for storing radioactive material are partitioned, and includes the steps of: arranging a plurality of first plate-shaped members at intervals in the plate thickness direction; arranging a plurality of second plate-shaped members at intervals in the plate thickness direction in a direction perpendicular to the plurality of first plate-shaped members on top of the plurality of first plate-shaped members to form a plate-shaped member assembly; stacking a plurality of plate-shaped member assemblies in the vertical direction to constitute a basket body; and the plurality of first plates constituting the plate-shaped member assembly located at the bottom layer of the basket body The method includes the steps of: connecting a first support member to each longitudinal end of a portion of the first plate-shaped member among the plate-shaped members, and connecting a second support member to each longitudinal end of a portion of the second plate-shaped member among the plurality of second plate-shaped members; and connecting a first support member to each longitudinal end of a portion of the first plate-shaped member among the plurality of first plate-shaped members in the plate-shaped member assembly located at the uppermost layer of the basket body, and connecting a second support member to each longitudinal end of a portion of the second plate-shaped member among the plurality of second plate-shaped members.

[0009] Furthermore, the radioactive material storage container of this disclosure comprises the basket, a body portion having a cavity for housing the basket, and a lid portion capable of closing the opening of the body portion. [Effects of the Invention]

[0010] The basket, the method for assembling the basket, and the radioactive material storage container of this disclosure can be made stronger. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a partially cutaway schematic diagram showing the internal structure of a radioactive material storage container. [Figure 2] Figure 2 is a horizontal cross-sectional view of the radioactive material storage container. [Figure 3] Figure 3 is a perspective view showing the basket of this embodiment. [Figure 4]Figure 4 is a perspective view showing the relationship between the first plate-like member and the first support member that constitute the basket. [Figure 5] Figure 5 is a perspective view showing the assembled state of the uppermost first plate-like member and the second plate-like member. [Figure 6] Figure 6 is a plan view showing the assembled state of the uppermost first plate-like member and the second plate-like member. [Figure 7] Figure 7 is a perspective view showing the assembled state of the bottom layer, the first plate-like member and the second plate-like member. [Figure 8] Figure 8 is a perspective view showing the assembly between the bottommost first plate-like member and the second plate-like member. [Figure 9] Figure 9 is a perspective view showing the lowest layer of the basket assembly method. [Figure 10] Figure 10 is a perspective view showing the lowest layer of the basket assembly method. [Figure 11] Figure 11 is a perspective view showing the lowest layer of the basket assembly method. [Figure 12] Figure 12 is a perspective view showing the lowest layer of the basket assembly method. [Figure 13] Figure 13 is a perspective view showing the lowest layer of the basket assembly method. [Figure 14] Figure 14 is a perspective view showing the lowest layer of the basket assembly method. [Figure 15] Figure 15 is a perspective view showing the lowest layer of the basket assembly method. [Figure 16] Figure 16 is a perspective view showing the assembled state of the plate-like members in the basket assembly method. [Figure 17] Figure 17 is a perspective view showing the assembled state of the support members in the basket assembly method. [Figure 18] Figure 18 is a perspective view showing the assembled state of the support members in the basket assembly method. [Figure 19] Figure 19 is a perspective view showing the assembled state of the support members in the basket assembly method. [Figure 20] Figure 20 is a schematic diagram showing a method of transporting a basket. [Figure 21] Figure 21 is a plan view of a main part of a basket showing a first modification of a support member. [Figure 22] Figure 22 is a longitudinal sectional view showing a second modification of a support member. [Figure 23] Figure 23 is a side view showing a third modification of a support member.

Mode for Carrying Out the Invention

[0012] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited by this embodiment, and when there are a plurality of embodiments, those configured by combining each embodiment are also included. In addition, the components in the embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those within a so-called equivalent range.

[0013] <Radioactive substance storage container> FIG. 1 is a partially cutaway schematic view showing the internal structure of a radioactive substance storage container, and FIG. 2 is a horizontal sectional view of the radioactive substance storage container.

[0014] As shown in FIGS. 1 and 2, a cask 11 as a radioactive substance storage container includes a body portion 12 and a lid portion 13. The body portion 12 has a container main body 21. The container main body 21 has an opening 22 formed at the upper end of a cylindrical shape (in this embodiment, a cylindrical shape), and the lower end is closed. The container main body 21 has a cavity 23 inside, and a basket 24 is disposed in the cavity 23. The basket 24 is provided with a plurality of cells (storage portions) 25 capable of individually storing radioactive substances (for example, spent fuel assemblies). The container main body 21 is a forged product made of carbon steel having a γ-ray shielding function. However, the container main body 21 may be made of stainless steel instead of carbon steel. Further, the container main body 21 may be a casting made of spheroidal graphite cast iron, carbon steel cast steel, or the like.

[0015] The body portion 12 has an outer cylinder 26 positioned with a gap between it and the outer surface of the container body 21. Multiple copper heat transfer fins 27 are provided between the outer surface of the container body 21 and the inner surface of the outer cylinder 26, spaced apart in the circumferential direction to conduct heat. In the body portion 12, a resin 28, which acts as a neutron shield, is positioned in the space enclosed by the container body 21, the outer cylinder 26, and the heat transfer fins 27. The resin 28 is a polymer material containing a large amount of hydrogen and contains boron or a boron compound having a neutron shielding function.

[0016] The body portion 12 is provided with a bottom portion 29 that protrudes below the closed lower end of the container body 21. The bottom portion 29 is formed to be smaller than the outer diameter of the container body 21. The bottom portion 29 has a space enclosed by the closed lower end of the container body 21, and resin (neutron shielding material) is placed in this space.

[0017] The body section 12 has trunnions 30 for suspending the cask 11 from the container body 21, which are provided at 90-degree or 180-degree intervals on the upper and lower parts of the cask 11. The trunnions 30 are provided from the container body 21 through the outer cylinder 26. The trunnions 30 protrude to the outermost part of the cask 11.

[0018] The lid portion 13 is positioned over the opening 22 of the container body 21. The lid portion 13 closes the opening 22 and seals the container body 21 (body portion 12). The lid portion 13 has a primary lid 31, a secondary lid 32, and a tertiary lid 33. The primary lid 31 is formed in a disc shape from carbon steel or stainless steel that shields against gamma rays. The secondary lid 32 covers the primary lid 31 and is visible on the outside of the cask 11, and like the primary lid 31, is formed in a disc shape from carbon steel or stainless steel that shields against gamma rays. A resin (neutron shield) 28 may be provided between the primary lid 31 and the secondary lid 32. The tertiary lid 33 is provided on the outside of the secondary lid 32, but the tertiary lid 33 may be omitted. The tertiary lid 33 is formed in a disc shape from carbon steel or stainless steel that shields against gamma rays, similar to the primary lid 31 and the secondary lid 32.

[0019] The primary lid 31 is fixed to the first stage portion 22a formed in the opening 22 of the container body 21 by bolts (not shown) made of carbon steel or stainless steel. The secondary lid 32 is fixed to the second stage portion 22b formed in the opening 22 of the container body 21 by bolts (not shown) made of carbon steel or stainless steel. Although not shown, metal gaskets are provided between the primary lid 31 and the first stage portion 22a and between the secondary lid 32 and the second stage portion 22b. The metal gaskets ensure airtightness between the primary lid 31 and the first stage portion 22a and between the secondary lid 32 and the second stage portion 22b. The tertiary lid 33 is fixed to the first stage portion 22c formed in the opening 22 of the container body 21 by bolts (not shown) made of carbon steel or stainless steel.

[0020] In a nuclear power plant, for example, multiple spent fuel assemblies are stored in each cell 25 of the basket 24 of the container body 21 and sealed by the lid 13. The cask 11 is transported, for example, from the nuclear power plant to a storage facility. During transport, the cask 11 is fitted with transport buffers (not shown). The transport buffers are fitted to the upper and lower parts of the body 12. The cask 11 is loaded on its side onto the cargo bed of a transport vehicle and transported to the storage facility.

[0021] <Basket> Figure 3 is a perspective view showing the basket of this embodiment.

[0022] As described above, the container body 21 is provided with a cavity 23 that forms a cylindrical space inside. The cavity 23 is not limited to a perfect cylinder shape; it may have notches or other features around its perimeter. The basket 24 is placed in the cavity 23. The basket 24 is provided with multiple cells 25 capable of storing, for example, multiple spent fuel assemblies or other radioactive waste.

[0023] As shown in Figure 3, the basket 24 has a plurality of first plate-shaped members 41, a plurality of second plate-shaped members 42, a plurality of first support members 43, a plurality of second support members 44, and a plurality of third support members 45.

[0024] Multiple first plate-like members 41 are arranged at intervals in the thickness direction. Multiple second plate-like members 42 are arranged at intervals in the thickness direction. Multiple first plate-like members 41 and multiple second plate-like members 42 are combined in orthogonal directions. Multiple first plate-like members 41 and multiple second plate-like members 42 are assembled in a grid pattern to form a plate-like member assembly 51. Multiple plate-like member assemblies 51 are stacked vertically to form a basket body 52.

[0025] In this embodiment, the first plate-shaped member 41 and the second plate-shaped member 42 are each composed of seven pieces, but the number is not limited. The number of first plate-shaped members 41 and second plate-shaped members 42 is appropriately set according to the outer diameter of the basket 24, the size of the cavity 23, and the size and number of radioactive waste pieces to be contained.

[0026] The first support member 43, the second support member 44, and the third support member 45 are arranged in multiples on the outside of the basket body 52, along the vertical direction (the stacking direction of the plate-shaped member assembly 51) and spaced apart in the circumferential direction. The first support member 43 supports the longitudinal ends of some of the first plate-shaped members 41 among the multiple first plate-shaped members 41. The second support member 44 supports the longitudinal ends of some of the second plate-shaped members 42 among the multiple second plate-shaped members 42. The third support member 45 supports the longitudinal ends of some of the first plate-shaped members 41 among the multiple first plate-shaped members 41 and the longitudinal ends of some of the second plate-shaped members 42 among the multiple second plate-shaped members 42.

[0027] Figure 4 is a perspective view showing the relationship between the first plate-like member and the first support member that constitute the basket.

[0028] As shown in Figures 3 and 4, of the multiple (7) first plate-shaped members 41 in the bottom layer, three of the first plate-shaped members 41 located in the middle of the plate thickness direction are connected at their respective ends in the longitudinal direction to the lower end of the first support member 43. Similarly, of the multiple (7) first plate-shaped members 41 in the top layer, three of the first plate-shaped members 41 located in the middle of the plate thickness direction are connected at their respective ends in the longitudinal direction to the upper end of the first support member 43. In this case, the arrangement direction of the multiple (7) first plate-shaped members 41 in the bottom layer and the arrangement direction of the multiple (7) first plate-shaped members 41 in the top layer are the same.

[0029] The lowest plate-shaped member assembly 51 is formed by arranging multiple (7) second plate-shaped members 42 in a perpendicular direction above multiple (7) first plate-shaped members 41 of the lowest layer. The uppermost plate-shaped member assembly 51 is formed by arranging multiple (7) second plate-shaped members 42 in a perpendicular direction below multiple (7) first plate-shaped members 41 of the uppermost layer. Intermediate plate-shaped member assemblies 51 are arranged in multiple stages between the lowest plate-shaped member assembly 51 and the uppermost plate-shaped member assembly 51.

[0030] <Uppermost plate-like component assembly> Figure 5 is a perspective view showing the assembled state of the uppermost first plate-like member and the second plate-like member, and Figure 6 is a plan view showing the assembled state of the uppermost first plate-like member and the second plate-like member.

[0031] As shown in Figures 5 and 6, the uppermost plate-like member assembly 51A is constructed by combining a plurality of first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d in a grid pattern. That is, the plate-like member assembly 51A is constructed by combining a plurality of second plate-like members 42a, 42b, 42c, 42d, which are also spaced apart in the plate thickness direction, with a plurality of first plate-like members 41a, 41b, 41c, 41d, which are spaced apart in the plate thickness direction, from below in a direction perpendicular to the first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d, respectively. The plate-like member assembly 51A is constructed by combining a plurality of cells 25 along the vertical direction with spaces in the horizontal direction.

[0032] The first plate-like members 41a, 41b, 41c, 41d and the second plate-like members 42a, 42b, 42c, 42d, although not shown in the figures, are constructed by overlapping a rigid plate material that serves as a strength member with a functional plate material that serves as a functional member in the thickness direction. Here, the functional member has one or more functions, either neutron absorption or thermal conductivity greater than or equal to that of the rigid plate material. The rigid plate material is made of, for example, carbon steel, stainless steel, or aluminum alloy. The functional plate material has a structure in which a ceramic layer containing boron carbide as a neutron absorber is wrapped in a stainless steel plate or aluminum alloy plate. Alternatively, the functional plate material may be made of an aluminum composite or aluminum alloy to which boron or a boron compound has been added as a neutron absorber. In addition to boron, gadolinium can be used in the functional plate material. In addition to aluminum or aluminum alloy, stainless steel can be used in the functional plate material.

[0033] The first plate-like members 41a, 41b, 41c, and 41d are arranged such that the first plate-like member 41a is the longest, and the lengths decrease in the order of 41b, 41c, and 41d. The first plate-like members 41a, 41b, 41c, and 41d are positioned to pass through the center of the plate-like member assembly 51A, and are arranged radially outward in the order of 41b, 41c, and 41d. The second plate-like members 42a, 42b, 42c, and 42d are arranged such that the second plate-like member 42a is the longest, and the lengths decrease in the order of 42b, 42c, and 42d. The second plate-like members 42a, 42b, 42c, and 42d are positioned to pass through the center of the plate-like member assembly 51A, and are arranged radially outward in the order of 42b, 42c, and 42d.

[0034] The first plate-like members 41a, 41b, 41c, and 41d have notches formed at their lower ends, and the second plate-like members 42a, 42b, 42c, and 42d have notches formed at their upper ends. The first plate-like members 41a, 41b, 41c, and 41d and the second plate-like members 42a, 42b, 42c, and 42d are assembled so that their notches fit together. In this embodiment, the height of the first plate-like members 41a, 41b, 41c, and 41d is lower than the height of the second plate-like members 42a, 42b, 42c, and 42d. However, the height of the first plate-like members 41a, 41b, 41c, and 41d may be the same as the height of the second plate-like members 42a, 42b, 42c, and 42d.

[0035] The first support members 43a and 43b have a hollow shape. However, the shape of the first support members 43a and 43b is not limited to a hollow shape, and may also have an L-shaped cross-section or a U-shaped cross-section. The first support member 43a has a roughly square tubular shape, and the first support member 43b has a triangular tubular shape. The first support members 43a and 43b are made of, for example, carbon steel, stainless steel, or aluminum alloy. The upper end of the first support member 43a is positioned between the end of the first plate-shaped member 41a and the end of each first plate-shaped member 41b. The upper end of the first support member 43b is positioned outside the end of each first plate-shaped member 41b. The end of the first plate-shaped member 41a and the upper end of each first support member 43a are connected by a connecting member (for example, a bolt) 61a. The ends of each first plate-like member 41b and the upper ends of each first support member 43a, 43b are connected by a connecting member (for example, a bolt) 61b.

[0036] The second support members 44a and 44b are hollow. However, the shape of the second support members 44a and 44b is not limited to a hollow shape, and may be L-shaped, U-shaped, or the like. The second support member 44a is approximately rectangular, and the second support member 44b is triangular. The second support members 44a and 44b are made of, for example, carbon steel, stainless steel, or aluminum alloy. The upper end of the second support member 44a is positioned between the end of the second plate-shaped member 42a and the end of each second plate-shaped member 42b. The upper end of the second support member 44b is positioned outside the end of each second plate-shaped member 42b. The end of the second plate-shaped member 42a and the upper end of each second support member 44a are connected by a connecting member (for example, a bolt) 62a. The ends of each second plate-shaped member 42b and the upper ends of each second support member 44a, 44b are connected by a connecting member (for example, a bolt) 62b.

[0037] The outermost second plate-shaped member 42d intersects with the ends of the first plate-shaped members 41a and 41b at its middle section, and with the ends of the first plate-shaped member 41c at its ends, with the upper ends of the first support members 43a and 43b located on its outer surface. The second plate-shaped member 42d and the first support members 43a and 43b are connected by connecting members (e.g., bolts) 61c and 61d. However, the connecting members 61c and 61d do not protrude toward the cell 25 side. The outermost first plate-shaped member 41d intersects with the ends of the second plate-shaped members 42a and 42b at its middle section, and with the ends of the second plate-shaped member 42c at its ends, with the upper ends of the second support members 44a and 44b located on its outer surface. The first plate-shaped member 41d and the second support members 44a and 44b are connected by connecting members (e.g., bolts) 62c and 62d. However, the connecting members 62c and 62d do not protrude toward the cell 25 side.

[0038] The plate-shaped member assembly 51A is constructed by combining a plurality of first plate-shaped members 41a, 41b, 41c, 41d located on the upper side with a plurality of second plate-shaped members 42a, 42b, 42c, 42d located on the lower side in an orthogonal direction. Of the plurality of first plate-shaped members 41a, 41b, 41c, 41d, the first plate-shaped member 41c, which is located on the outer side in the thickness direction, is provided with a first locking portion 63 at its end in the longitudinal direction (horizontal direction). The first locking portion 63 is composed of a projection and a notch arranged vertically. Of the plurality of second plate-shaped members 42a, 42b, 42c, 42d, the second plate-shaped member 42d, which is located on the outer side in the thickness direction, is provided with a second locking portion 64 at its end. The second locking portion 64 is composed of a projection and a notch arranged vertically. The first locking portion 63 of the first plate-shaped member 41c and the second locking portion 64 of the second plate-shaped member 42d can be locked together horizontally. In this case, the projection of the first locking portion 63 of the first plate-shaped member 41c is located vertically below the projection of the second locking portion 64 of the second plate-shaped member 42d.

[0039] The third support member 45 has a hollow shape. The third support member 45 has a roughly triangular tubular shape. The third support member 45 is made of, for example, carbon steel, stainless steel, or aluminum alloy. The third support member 45 is positioned between the first support member 43 and the second support member 44 in the circumferential direction. The upper end of the third support member 45 is positioned between the end of each first plate-shaped member 41c and the end of each second plate-shaped member 42c. The end of the first plate-shaped member 41c and the upper end of the third support member 45 are connected by a connecting member (for example, a bolt) 61e. The end of the second plate-shaped member 42c and the upper end of the third support member 45 are connected by a connecting member (for example, a bolt) 62e.

[0040] <Bottom layer plate-like component assembly> Figure 7 is a perspective view showing the assembled state of the bottommost first plate-like member and the second plate-like member, and Figure 8 is a perspective view showing the assembly portion of the bottommost first plate-like member and the second plate-like member.

[0041] As shown in Figures 7 and 8, the lowest plate-like member assembly 51B is constructed by combining a plurality of first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d in a grid pattern. That is, the plate-like member assembly 51B is constructed by combining a plurality of second plate-like members 42a, 42b, 42c, 42d, which are also spaced apart in the plate thickness direction, with a plurality of first plate-like members 41a, 41b, 41c, 41d, which are spaced apart in the plate thickness direction, from above in a perpendicular direction. The plate-like member assembly 51B is constructed by combining a plurality of first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d, which are spaced apart in the plate thickness direction, to form a plurality of cells 25 along the vertical direction, which are spaced apart in the horizontal direction.

[0042] The connection structure between the first plate-like members 41a, 41b, 41c, 41d and the second plate-like members 42a, 42b, 42c, 42d and the first support member 43, the second support member 44, and the third support member 45 in the plate-like member assembly 51B is almost the same as that of the plate-like member assembly 51A, and therefore no explanation is provided. In other words, the only difference between the plate-like member assembly 51B and the plate-like member assembly 51A is that the positions of the first plate-like members 41a, 41b, 41c, 41d and the second plate-like members 42a, 42b, 42c, 42d are reversed vertically, and the connection position between the first support member 43, the second support member 44, and the third support member 45 is at the lower end.

[0043] Furthermore, the plate-shaped member assembly 51B is constructed by combining a plurality of first plate-shaped members 41a, 41b, 41c, 41d located on the lower side with a plurality of second plate-shaped members 42a, 42b, 42c, 42d located on the upper side in an orthogonal direction. Of the plurality of first plate-shaped members 41a, 41b, 41c, 41d, the first plate-shaped member 41c, which is located on the outer side in the thickness direction, is provided with a first locking portion 65 at its end. The first locking portion 65 is composed of a projection and a notch arranged vertically. Of the plurality of second plate-shaped members 42a, 42b, 42c, 42d, the second plate-shaped member 42d, which is located on the outer side in the thickness direction, is provided with a second locking portion 66 at its end. The second locking portion 66 is composed of a projection and a notch arranged vertically. The first locking portion 65 of the first plate-shaped member 41c and the second locking portion 66 of the second plate-shaped member 42d can be locked together horizontally. In this case, the projection of the first locking portion 65 of the first plate-shaped member 41c is positioned vertically above and below the second locking portion 66 of the second plate-shaped member 42d.

[0044] Furthermore, the lowest plate-shaped member assembly 51B is provided with lifting notches 71 at the bottom of the first plate-shaped members 41a, 41b, 41c, and 41d. The lifting notches 71 are provided to connect adjacent cells 25. In addition, the lowest plate-shaped member assembly 51B is provided with lifting notches 72 at the bottom of the second plate-shaped members 42a, 42b, 42c, and 42d. The lifting notches 72 are provided to connect adjacent cells 25. The lifting notches 71 and 72 are also used as drainage notches. Note that the lifting notches 71 and 72 may be provided not only in the lowest plate-shaped members 41 and 42, but also in the uppermost plate-shaped members 41 and 42, and in the intermediate plate-shaped members 41 and 42. Furthermore, the lifting notches 71 and 72 do not need to be provided for all cells 25, but may be provided only at the positions where the hooks 94 of the lifting device 93, described later, are secured.

[0045] <Assembly of plate-like intermediate layer members> As shown in Figure 3, the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B are constructed by combining a plurality of first plate-shaped members 41 and a plurality of second plate-shaped members 42 in a grid pattern, with the ends of the first plate-shaped members 41 connected to a first support member 43 and the ends of the second plate-shaped members 42 connected to a second support member 44.

[0046] On the other hand, the multiple plate-shaped member assemblies 51 located in the intermediate layer between the plate-shaped member assembly 51A and the plate-shaped member assembly 51B are stacked on top of and supported by the plate-shaped member assembly 51B located in the lowest layer. The multiple plate-shaped member assemblies 51 in the intermediate layer are supported by contacting the first support member 43, the second support member 44, and the third support member 45 at their outer periphery, but they are not connected. That is, the ends of the multiple first plate-shaped members 41 and the multiple second plate-shaped members 42 are not connected to the first support member 43, the second support member 44, and the third support member 45. However, some of the multiple plate-shaped member assemblies 51 in the intermediate layer may have their ends connected to the first support member 43, the second support member 44, and the third support member 45.

[0047] <How to assemble the basket> Figure 9 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 10 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 11 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 12 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 13 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 14 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 15 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, and Figure 16 is a perspective view showing the assembled state of the plate-like members in the basket assembly method.

[0048] As shown in Figure 9, first, three first plate-like members 41a and 41b are placed at intervals in the thickness direction. Then, two second plate-like members 42d are placed above the three first plate-like members 41a and 41b, perpendicular to the first plate-like members 41a and 41b, at intervals in the thickness direction. In this case, the three first plate-like members 41a and 41b are located towards the center of the basket 24, and the two second plate-like members 42d are located towards the outer periphery of the basket 24, that is, second from the outer periphery. The two are assembled by fitting the lower notches of the two second plate-like members 42d into the upper notches of the three first plate-like members 41a and 41b.

[0049] As shown in Figure 10, the next step is to attach the two first plate-shaped members 41c to the plate-shaped assembly, which consists of three first plate-shaped members 41a, 41b and two second plate-shaped members 42d. Specifically, by horizontally moving the first plate-shaped members 41c from both sides of the first plate-shaped members 41a, 41b, the ends of the first plate-shaped members 41c are attached to the ends of the second plate-shaped members 42d, as shown in Figure 11. The first plate-shaped member 41c is provided with a first locking portion 65 at its end, and the second plate-shaped member 42d is provided with a second locking portion 66 at its end. Therefore, by bringing the first plate-shaped member 41c closer to the second plate-shaped member 42d in the horizontal direction, the first locking portion 65 of the first plate-shaped member 41c is locked to the second locking portion 66 of the second plate-shaped member 42d. As a result, the first plate-like member 41c and the second plate-like member 42d are constrained from moving vertically relative to each other.

[0050] As shown in Figure 12, two first plate-shaped members 41d are attached to a plate-shaped assembly made up of five first plate-shaped members 41a, 41b, 41c and two second plate-shaped members 42d. First, the first plate-shaped members 41d are placed on both sides of the first plate-shaped member 41c with a gap between them. Then, as shown in Figure 13, the second plate-shaped member 42a is lowered from above and attached to the seven first plate-shaped members 41a, 41b, 41c, 41d. In other words, the two are attached by fitting the lower notch of one second plate-shaped member 42a into the upper notches of the seven first plate-shaped members 41a, 41b, 41c, 41d.

[0051] As shown in Figure 14, two second plate-shaped members 42b are attached to a plate-shaped assembly which consists of five first plate-shaped members 41a, 41b, 41c, and 41d and three second plate-shaped members 42a and 42d. The two second plate-shaped members 42b are lowered from above and attached to the seven first plate-shaped members 41a, 41b, 41c, and 41d. In other words, the two second plate-shaped members 42b are attached by fitting the lower notches of the two first plate-shaped members 42b into the upper notches of the seven first plate-shaped members 41a, 41b, 41c, and 41d.

[0052] Next, as shown in Figure 15, two second plate-shaped members 42c are attached to a plate-shaped assembly which consists of seven first plate-shaped members 41a, 41b, 41c, 41d and five second plate-shaped members 42a, 42b, 42d. The two second plate-shaped members 42c are lowered from above and attached to the seven first plate-shaped members 41a, 41b, 41c, 41d. In other words, the two second plate-shaped members 42c are attached by fitting the lower notches of the two first plate-shaped members 42c into the upper notches of the seven first plate-shaped members 41a, 41b, 41c, 41d.

[0053] The bottom layer plate member assembly 51B is formed by assembling seven first plate members 41a, 41b, 41c, 41d and seven second plate members 42a, 42b, 42c, 42d. Next, once the bottom layer plate member assembly 51B is formed, the intermediate layer plate member assembly 51 is formed in multiple stages by assembling the first plate members 41a, 41b, 41c, 41d and the second plate members 42a, 42b, 42c, 42d to the plate member assembly 51B. Finally, the top layer plate member assembly 51A is formed by assembling the second plate members 42a, 42b, 42c, 42d and the first plate members 41a, 41b, 41c, 41d at the top, as shown in Figure 16. When assembling the uppermost plate-shaped member assembly 51A, multiple first plate-shaped members 41c and multiple second plate-shaped members 42d are assembled in a grid pattern, similar to the lowermost plate-shaped member assembly 51B. At this time, the first locking portion 63 of the first plate-shaped member 41c is locked to the second locking portion 64 of the second plate-shaped member 42d, thereby restricting the relative vertical movement between the first plate-shaped member 41c and the second plate-shaped member 42d. The basket body 52 is then constructed from the uppermost plate-shaped member assembly 51A, multiple intermediate plate-shaped member assemblies 51, and the lowermost plate-shaped member assembly 51B.

[0054] Figure 17 is a perspective view showing the assembled state of the support members in the basket assembly method, Figure 18 is a perspective view showing the assembled state of the support members in the basket assembly method, and Figure 19 is a perspective view showing the assembled state of the support members in the basket assembly method.

[0055] As shown in Figure 17, once the basket body 52 is assembled, the support members 43, 44, and 45 are attached to the basket body 52. ​​First, the first support members 43a and 43b are placed on the longitudinal ends of the multiple first plate-like members 41a and 41b. Then, the ends of the multiple first plate-like members 41a and 41b are fastened to the ends of the first support members 43a and 43b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. Additionally, the middle portion of the second plate-like member 42d is fastened to the ends of the first support members 43a and 43b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B.

[0056] As shown in Figure 18, next, second support members 44a and 44b are placed on the longitudinal ends of the multiple second plate-like members 42a and 42b. Then, the ends of the multiple second plate-like members 42a and 42b are fastened to the ends of the second support members 44a and 44b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. In addition, the middle portion of the first plate-like member 41d is fastened to the ends of the second support members 44a and 44b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B.

[0057] As shown in Figure 19, finally, a third support member 45 is placed between the first support members 43a, 43b and the second support members 44a, 44b. Then, the ends of the first plate-shaped member 41c, the end of the third support member 45, and the end of the second plate-shaped member 42c are fastened together at the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B.

[0058] In addition, while the basket 24 connects the first plate-like member 41 and the second plate-like member 42 to the respective support members 43, 44, and 45 at the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B, the first plate-like member 41 and the second plate-like member 42 to the respective support members 43, 44, and 45 may also be connected at a part of the intermediate plate-like member assembly 51 between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B.

[0059] In this assembled basket 24, the ends of the first plate-like members 41a, 41b and the ends of the first support members 43a, 43b are connected at least between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. In addition, the ends of the second plate-like members 42a, 42b and the ends of the second support members 44a, 44b are connected between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. As a result, the basket 24 is firmly assembled between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B, so that the first plate-like members 41a, 41b, 41c, 41d, the second plate-like members 42a, 42b, 42c, 42d, the first support members 43a, 43b, and the second support members 44a, 44b do not fall off.

[0060] Then, the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B connect the ends of the second plate-shaped member 42d to the ends of the first support members 43a and 43b, and the first plate-shaped member 41d to the ends of the second support members 44a and 44b. In addition, the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B connect the end of the first plate-shaped member 41c to the end of the third support member 45 and the end of the second plate-shaped member 42c. As a result, the support of the first plate-shaped members 41a, 41b, 41c, and 41d and the second plate-shaped members 42a, 42b, 42c, and 42d is strengthened.

[0061] Figure 20 is a schematic diagram illustrating the method of transporting the basket.

[0062] As described above, once the basket 24 is assembled, it is carried into the cask 11 as shown in Figure 20. That is, the cask 11 is placed on the floor 81 with only the body 12 remaining, with the lid 13 removed. The crane 91 lifts the lifting beam 92, to which the upper ends of a plurality of lifting devices 93 are connected, and each of the lifting devices 93 has a hook 94 at its lower end.

[0063] Multiple lifting devices 93 are inserted through the inside of the basket 24, with each hook 94 supporting the lower end of the basket 24. In this case, the hooks 94 can stably support the basket 24 by engaging with the lifting notches 71, 72 (see Figure 7) formed in the first plate-shaped member 41 or the second plate-shaped member 42 that constitute the lowest plate-shaped member assembly 51B. The lifting devices 93 may also support the upper end or middle part of the basket 24. The crane 91 is operated to transport the basket 24 and position it above the body 12. Then, the crane 91 lowers the basket 24 and brings it into the inside of the body 12. The cask 11 is assembled when the basket 24 is placed in the cavity 23 of the body 12.

[0064] <Variation> In the embodiment described above, the first support members 43, 43a, 43b, the second support members 44, 44a, 44b, and the third support member 45 are elongated hollow (cylindrical) objects, manufactured, for example, by extrusion molding of metal (e.g., aluminum). However, the configuration is not limited to this.

[0065] Figure 21 is a plan view of the main part of a basket representing a first modified example of the support member. As shown in Figure 21, the third support member 45 has a plurality of (two in the first modified example) divided support members 45a, 45b divided horizontally. The divided support members 45a, 45b have a hollow shape (cylindrical shape). The divided support members 45a, 45b are integrally connected by a plurality of connecting members (e.g., bolts) 61f. The third support member 45 is composed of a plurality of divided support members 45a, 45b integrally connected by connecting members 61f.

[0066] Figure 22 is a longitudinal cross-sectional view showing a second modified example of the support member. As shown in Figure 22, the third support member 45 has a plurality of (two in the second modified example) divided support members 45c, 45d divided in the vertical direction. The divided support members 45c, 45d have a hollow shape (cylindrical shape). The divided support member 45c has a fitting portion 101 formed at its lower end, with a smaller outer diameter. The divided support member 45d has a fitting portion 102 formed at its upper end, with a larger inner diameter. The divided support members 45c, 45d are fitted together by the fitting portions 101, 102 and are integrally connected by a plurality of connecting members (for example, bolts) 103. The third support member 45 is composed of a plurality of divided support members 45c, 45d integrally connected by the connecting members 103.

[0067] Figure 23 is a side view showing a third modified example of the support member. As shown in Figure 23, the third support member 45 has a plurality of (two in the third modified example) divided support members 45e, 45f divided in the vertical direction. The divided support members 45e, 45f have a hollow shape (cylindrical shape). The divided support member 45e has a semicircular fitting portion 104 formed at its lower end. The divided support member 45f has a semicircular fitting portion 105 formed at its upper end. The divided support members 45e, 45f are fitted together such that the fitting portions 104, 105 form a circular shape and are integrally connected by a plurality of connecting members (for example, bolts) 106. The third support member 45 is composed of a plurality of divided support members 45e, 45f integrally connected by the connecting members 106.

[0068] In each modified example, the number of divisions of the third support member 45 is not limited to two, but may be three or more. Furthermore, the division structure is not limited to the third support member 45, but may also be applied to the first support members 43, 43a, 43b and the second support members 44, 44a, 44b. Moreover, the shape of the connecting portion in the divided support member is not limited to the shape described above.

[0069] [Effects of this embodiment] The basket according to the first embodiment comprises a plurality of first plate-shaped members 41 arranged at intervals in the thickness direction, a plurality of second plate-shaped members 42 arranged at intervals in the thickness direction and combined in a direction perpendicular to the plurality of first plate-shaped members 41, a plurality of first support members 43 that support the longitudinal ends of some of the first plate-shaped members 41, and a plurality of second support members 44 that support the longitudinal ends of some of the second plate-shaped members 42.

[0070] In the basket according to the first embodiment, a plate-shaped member assembly 51 is formed by combining a plurality of first plate-shaped members 41 and a plurality of second plate-shaped members 42 in orthogonal directions. Then, each longitudinal end of the first plate-shaped member 41 is supported by a first support member 43, and each longitudinal end of the second plate-shaped member 42 is supported by a second support member 44, thereby forming a basket 24. As a result, the basket 24 is supported by a plurality of first support members 43 and a plurality of second support members 44, which combines a plurality of first plate-shaped members 41 and a plurality of second plate-shaped members 42, thereby improving strength.

[0071] The basket according to the second embodiment is the basket according to the first embodiment, further comprising a basket body 52 formed by stacking multiple layers of plate-shaped member assemblies 51, each consisting of multiple first plate-shaped members 41 and multiple second plate-shaped members 42 assembled in a grid pattern, in the vertical direction, and multiple first support members 43 and multiple second support members 44 arranged along the outside of the basket body 52 in the vertical direction and spaced apart in the circumferential direction. This allows the plate-shaped member assemblies 51, stacked in multiple layers, to be properly supported by the first support members 43 and second support members 44.

[0072] The basket according to the third embodiment is a basket according to the second embodiment, further comprising a plate-shaped member assembly 51B located at the lowest layer of the basket body 52, wherein the longitudinal ends of some of the first plate-shaped members 41a, 41b among the plurality of first plate-shaped members 41a, 41b are connected to first support members 43a, 43b, and the longitudinal ends of some of the second plate-shaped members 42a, 42b among the plurality of second plate-shaped members 42 are connected to second support members 44a, 44b. As a result, at least the plate-shaped member assembly 51B located at the lowest layer can support the plurality of first plate-shaped members 41 and the plurality of second plate-shaped members 42 by the first support member 43 and the second support member 44. Furthermore, when lifting the basket 24, the hook 94 of the lifting device 93 can be attached to the first plate-shaped member 41 or the second plate-shaped member 42 of the plate-shaped member assembly 51B at the lowest layer, and the basket 24 can be easily lifted.

[0073] The basket according to the fourth embodiment is a basket according to the second or third embodiment, further comprising a plate-shaped member assembly 51A located at the uppermost layer of the basket body 52, wherein the longitudinal ends of some of the first plate-shaped members 41a, 41b among the plurality of first plate-shaped members 41a, 41b are connected to first support members 43a, 43b, and the longitudinal ends of some of the second plate-shaped members 42a, 42b among the plurality of second plate-shaped members 42 are connected to second support members 44a, 44b. As a result, at least the plate-shaped member assembly 51A located at the uppermost layer can support the plurality of first plate-shaped members 41 and the plurality of second plate-shaped members 42 by the first support member 43 and the second support member 44. Furthermore, when lifting the basket 24, the basket 24 can be lifted stably.

[0074] The basket according to the fifth embodiment is a basket according to any one of the second to fourth embodiments, further comprising a plurality of plate-shaped member assemblies 51 located in the intermediate layer of the basket body 52, which are stacked and supported on the plate-shaped member assembly 51B located in the lowest layer, and the longitudinal ends of the plurality of first plate-shaped members 41 are not connected to the first support member 43, and the longitudinal ends of the plurality of second plate-shaped members 42 are not connected to the second support member 44. This eliminates the need for the first support member 43 and the second support member 44 to support the intermediate layer plate-shaped member assemblies 51, thereby simplifying the structure.

[0075] The basket according to the sixth embodiment is a basket according to any one of the first to fifth embodiments, and furthermore, the first support member 43 and the second support member 44 have a hollow shape. This makes it possible to reduce the weight of the first support member 43 and the second support member 44.

[0076] The basket according to the seventh embodiment is a basket according to any one of the first to sixth embodiments, further comprising: a first support member 43 connected to the ends of a first plate-like member 41 positioned on both sides in the width direction; and a second support member 44 connected to the ends of a second plate-like member 42 positioned on both sides in the width direction. This allows for easy and strong connection between the plate-like members 41, 42 and the support members 43, 44.

[0077] The basket according to the eighth embodiment is a basket according to any one of the first to seventh embodiments, further comprising: first support members 43a, 43b connected to the longitudinal intermediate portion of the second plate-shaped member 42d, and second support members 44a, 44b connected to the longitudinal intermediate portion of the first plate-shaped member 41d. This allows for a strong connection between the plate-shaped members 41, 42 and the support members 43, 44.

[0078] The basket according to the ninth embodiment is a basket according to any one of the first to eighth embodiments, and further has a plurality of third support members 45 to which the longitudinal ends of some of the first plate-like members 41d among the plurality of first plate-like members 41 and the longitudinal ends of some of the second plate-like members 42d among the plurality of second plate-like members 42 are connected. As a result, the strength of the basket 24 can be improved by arranging the plurality of support members 43, 44, 45 around the basket body 52 to support the plurality of plate-like member assemblies 51.

[0079] The basket according to the tenth embodiment is a basket according to any one of the second to ninth embodiments, further comprising a plate-shaped member assembly 51B located at the lowest layer of the basket body 52, in which a plurality of second plate-shaped members 42 are assembled above a plurality of first plate-shaped members 41, a first plate-shaped member 41c which is positioned on the outer side in the thickness direction of the plurality of first plate-shaped members 41 has a first locking portion 63 at its end, and a second locking portion 64 which locks to the first locking portion 63 is provided at the end of a second plate-shaped member 42d which is positioned on the outer side in the thickness direction of the plurality of second plate-shaped members 42. As a result, the relative movement of the first plate-shaped member 41 and the second plate-shaped member 42 with respect to the vertical direction is restrained, and the strength of the basket 24 can be improved.

[0080] The basket according to the eleventh embodiment is a basket according to any one of the first to tenth embodiments, further comprising lifting notches 71 and 72 at the lower part of at least one of the first plate-shaped member 41 and the second plate-shaped member 42. This allows the hook 94 of the lifting device 93 to be engaged with the lifting notches 71 and 72 to lift the basket 24, enabling stable transport of the basket 24.

[0081] The basket according to the twelfth embodiment is a basket according to any one of the second to eleventh embodiments, further comprising a plate-shaped member assembly 51A located at the uppermost layer of the basket body 52, wherein a plurality of second plate-shaped members 42 are assembled below a plurality of first plate-shaped members 41, and a first plate-shaped member 41c, which is positioned on the outer side in the thickness direction of the plurality of first plate-shaped members 41, is provided with a first locking portion 65 at its end, and a second locking portion 66, which locks to the first locking portion 65, is provided at the end of a second plate-shaped member 42d, which is positioned on the outer side in the thickness direction of the plurality of second plate-shaped members 42. As a result, the relative movement of the first plate-shaped member 41 and the second plate-shaped member 42 with respect to the vertical direction is restrained, and the strength of the basket 24 can be improved.

[0082] The basket assembly method according to the 13th embodiment includes the steps of: arranging a plurality of first plate-like members 41 at intervals in the plate thickness direction; arranging a plurality of second plate-like members 42 on top of the plurality of first plate-like members 41 in a direction perpendicular to the plurality of first plate-like members 41 at intervals in the plate thickness direction to form a plate-like member assembly 51; stacking a plurality of plate-like member assemblies 51 in the vertical direction to form a basket body 52; and removing some of the first plate-like parts of the plurality of first plate-like members 41 that constitute the plate-like member assembly 51B located at the bottom layer of the basket body 52. The method includes the steps of connecting first support members 43 to each longitudinal end of material 41 and connecting second support members 44 to each longitudinal end of some of the second plate-shaped members 42 among the plurality of second plate-shaped members 42, and connecting first support members 43 to each longitudinal end of some of the first plate-shaped members 41 among the plurality of first plate-shaped members 41 in the plate-shaped member assembly 51A located at the uppermost layer of the basket body 52 and connecting second support members 44 to each longitudinal end of some of the second plate-shaped members 42 among the plurality of second plate-shaped members 42.

[0083] According to the basket assembly method of the 13th embodiment, a plate-shaped member assembly 51 is formed by combining a plurality of first plate-shaped members 41 and a plurality of second plate-shaped members 42 in orthogonal directions. Then, each longitudinal end of the first plate-shaped member 41 is supported by a first support member 43, and each longitudinal end of the second plate-shaped member 42 is supported by a second support member 44 to form a basket 24. As a result, the basket 24 is supported by a plurality of first support members 43 and a plurality of second support members 44, which combines a plurality of first plate-shaped members 41 and a plurality of second plate-shaped members 42, thereby improving strength.

[0084] The basket assembly method according to the 14th embodiment is the basket assembly method according to the 13th embodiment, further comprising: in the plate-shaped member assembly 51B located at the uppermost or lowermost layer of the basket body 52, the second plate-shaped member 42d on the outer side in the thickness direction is positioned above the first plate-shaped members 41a, 41b, and the first plate-shaped member 41c on the outer side in the thickness direction is moved in the thickness direction so that each end in the longitudinal direction is locked to the end of the second plate-shaped member 42d. As a result, the relative movement of the first plate-shaped members 41a, 41b, 41c, 41d and the second plate-shaped members 42a, 42b, 42c, 42d with respect to the vertical direction is restrained. Therefore, the hook 94 of the lifting device 93 can be locked to the first plate-shaped members 41a, 41b, 41c, 41d or the second plate-shaped members 42a, 42b, 42c, 42d, and the basket 24 can be safely lifted.

[0085] The radioactive material storage container according to the 15th embodiment comprises a basket 24, a body 12 having a cavity 23 for housing the basket 24, and a lid 13 capable of closing the opening of the body 12. This improves the strength of the basket 24 and allows for the safe storage of radioactive waste by the cask 11. [Explanation of Symbols]

[0086] 11. Cask (container for radioactive material) 12 Torso 13 Lid 21 Container body 22 Opening 23 Cavity 24 Basketball 25 cells (storage compartment) 26 Outer cylinder 27 Heat transfer fins 28 Resin 29 Bottom 30 Trunnion 31 Primary lid 32 Secondary lid 33 Tertiary lid 41, 41a, 41b, 41c, 41d First plate-shaped member 42, 42a, 42b, 42c, 42d Second plate-shaped member 43, 43a, 43b First support member 44, 44a, 44b Second support member 45 Third support member 51, 51A, 51B Plate-shaped member assembly 52 Basket body 61a, 61b, 61c, 61d, 61e Connecting members 62a, 62b, 62c, 62d, 62e Connecting members 63, 65 First locking part 64, 66 Second locking part 71, 72 Lifting notches

Claims

1. In a basket in which multiple storage compartments for radioactive materials are partitioned, Multiple first plate-shaped members are arranged at intervals in the thickness direction, A plurality of second plate-shaped members are arranged at intervals in the thickness direction and combined in a direction perpendicular to the plurality of first plate-shaped members, A plurality of first support members, each of the longitudinal ends of some of the first plate-shaped members, A plurality of second support members, each of the longitudinal ends of some of the plurality of second plate-shaped members, A basket equipped with a basket.

2. The plate-shaped member assembly, in which the plurality of first plate-shaped members and the plurality of second plate-shaped members are assembled in a grid pattern, is stacked in multiple layers in the vertical direction to form a basket body, and the plurality of first support members and the plurality of second support members are arranged along the outside of the basket body in the vertical direction and spaced apart in the circumferential direction. The basket according to claim 1.

3. The plate-shaped member assembly located at the lowest layer of the basket body is such that the longitudinal ends of some of the first plate-shaped members are connected to the first support member, and the longitudinal ends of some of the second plate-shaped members are connected to the second support member. The basket according to claim 2.

4. The plate-shaped member assembly located at the uppermost layer of the basket body is such that the longitudinal ends of some of the first plate-shaped members are connected to the first support member, and the longitudinal ends of some of the second plate-shaped members are connected to the second support member. The basket according to claim 3.

5. The plurality of plate-shaped member assemblies located in the intermediate layer of the basket body are stacked on top of and supported by the plate-shaped member assembly located in the lowest layer, and the longitudinal ends of the plurality of first plate-shaped members are not connected to the first support member, and the longitudinal ends of the plurality of second plate-shaped members are not connected to the second support member. The basket according to claim 3 or claim 4.

6. The first support member and the second support member have a hollow shape. The basket according to claim 1.

7. The first support member is connected to the ends of the first plate-shaped member on both sides in the width direction, and the second support member is connected to the ends of the second plate-shaped member on both sides in the width direction. The basket according to claim 6.

8. The first support member is connected to the intermediate portion in the longitudinal direction of the second plate-shaped member, and the second support member is connected to the intermediate portion in the longitudinal direction of the first plate-shaped member. The basket according to claim 7.

9. The device has a plurality of third support members to which the longitudinal ends of some of the first plate-shaped members and the longitudinal ends of some of the second plate-shaped members are connected. The basket according to claim 1.

10. The plate-shaped member assembly located at the lowest layer of the basket body has the plurality of second plate-shaped members assembled above the plurality of first plate-shaped members, and the first plate-shaped members arranged on the outer side in the thickness direction of the plurality of first plate-shaped members are provided with a first locking portion at their ends, and the second plate-shaped members arranged on the outer side in the thickness direction of the plurality of second plate-shaped members are provided with a second locking portion at their ends that locks with the first locking portion. The basket according to claim 2.

11. A lifting notch is provided at the lower part of at least one of the first plate-shaped member and the second plate-shaped member. The basket according to claim 10.

12. The plate-shaped member assembly located at the uppermost layer of the basket body has the plurality of second plate-shaped members assembled below the plurality of first plate-shaped members, and the first plate-shaped members arranged on the outer side in the thickness direction of the plurality of first plate-shaped members are provided with a first locking portion at their ends, and the second plate-shaped members arranged on the outer side in the thickness direction of the plurality of second plate-shaped members are provided with a second locking portion at their ends that locks with the first locking portion. The basket according to claim 2.

13. In a method for assembling a basket in which multiple storage compartments for storing radioactive materials are partitioned, The steps include arranging multiple first plate-shaped members at intervals in the thickness direction of the plate, The steps include: forming a plate-shaped member assembly by combining multiple first plate-shaped members on the upper part of the multiple first plate-shaped members, with multiple second plate-shaped members spaced apart in the thickness direction in a direction perpendicular to the multiple first plate-shaped members; The steps include stacking multiple plate-shaped member assemblies in the vertical direction to form the basket body, The steps include: connecting a first support member to each longitudinal end of a portion of the first plate members that constitute the plate member assembly located at the lowest layer of the basket body, and connecting a second support member to each longitudinal end of a portion of the second plate members that constitute a portion of the second plate members; The steps include: connecting the first support member to each longitudinal end of some of the first plate members in the plate member assembly located at the uppermost layer of the basket body, and connecting the second support member to each longitudinal end of some of the second plate members in the second plate members in the plurality of second plate members; A method for assembling a basket.

14. In the plate-shaped member assembly located at the uppermost or lowermost layer of the basket body, the intermediate portion of the plurality of first plate-shaped members in the thickness direction is positioned at a predetermined location, the outer portion of the plurality of second plate-shaped members in the thickness direction is positioned above the first plate-shaped member, and the outer portion of the plurality of first plate-shaped members in the thickness direction is moved in the thickness direction so that each end in the longitudinal direction is locked to the end of the second plate-shaped member. The method for assembling the basket according to claim 13.

15. The basket according to claim 1, A body portion having a cavity for housing the basket, A lid that can close the opening of the body, A radioactive material storage container equipped with [a specific feature].

Images