JP2009204582A - Basket for storing recycle fuel assembly and container for storing recycle fuel assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce machining of a member constituting a basket for storing recycle fuel assemblies. <P>SOLUTION: A plurality of plate members 10 are stacked on each other while long side ends 10LT1 and 10LT2 are butted on each other. Then, connecting members 30 are attached to side surfaces 10S of the stacked plate members 10 to interconnect the plurality of plate members, thereby constituting plate member connecting bodies 100. The plate member connecting bodies 100 are oppositely arranged, a square pipe 20 is arranged between the plate member connecting bodies 100, thereby constituting the basket for storing the recycle fuel assemblies. The recycle fuel assemblies are stored inside the square pipe 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recycled fuel assembly storage basket for storing a recycled fuel assembly, a recycled fuel assembly storage container, and a method for manufacturing a recycled fuel assembly storage basket.

  A spent nuclear fuel assembly used in a nuclear power plant or the like and taken out from the reactor after being loaded and burned in the nuclear reactor is referred to as a recycled fuel assembly. Since the recycled fuel assembly contains a highly radioactive substance such as a fission product (FP), it is usually cooled for a predetermined period in a cooling pit of a nuclear power plant or the like. After that, it is a recycled fuel assembly storage container having a radiation shielding function, stored in a cask used for transportation and storage, transported to a reprocessing facility or intermediate storage facility by vehicle or ship, and stored until reprocessing is performed. .

  When the recycled fuel assembly is accommodated in the cask, a recycled fuel assembly storage basket made of a material having a neutron absorption capacity and assembled with a storage space called a cell in which the recycled fuel assembly is stored is used. . The recycled fuel assemblies are inserted one by one into a plurality of storage spaces formed in the recycled fuel assembly storage basket. As a result, the recycle fuel assemblies being transported are kept at appropriate intervals so as not to reach criticality, and an adequate holding force against vibration during transport and assumed events is ensured. As a conventional example for storing such a recycled fuel assembly, for example, Patent Document 1 discloses a recycled fuel assembly by combining plate members using B (boron) -Al (aluminum) materials so as to be orthogonal to each other. What constitutes a space for storing a body is disclosed.

JP 2001-201595 A

  By the way, since boron has high hardness, the B—Al material is a material difficult to cut. For this reason, the recycled fuel assembly storage basket disclosed in Patent Document 1 is difficult to cut a plate-like member, and requires labor. In addition, the recycled fuel assembly storage basket disclosed in Patent Document 1 wastes material due to cutting.

  Therefore, the present invention has been made in view of the above, and a recycled fuel assembly storage basket and a recycled fuel assembly storage container that can reduce cutting of members constituting the recycled fuel assembly storage basket, and It is an object of the present invention to provide a method for manufacturing a recycled fuel assembly storage basket.

  In order to solve the above-described problems and achieve the object, a recycled fuel assembly storage basket according to the present invention includes a plurality of plate-like members stacked with their long-side end portions in contact with each other, and the plate-like member And extending in the direction in which the plate members are stacked and arranged in a direction orthogonal to the direction in which the plate members are stacked, and attached to the side surface of the plate-like member assembly constituted by the stacked plate members. A cylindrical structure having a plurality of connecting members that connect the plurality of plate-like members and project from the side surface, and a through-hole that penetrates in the longitudinal direction and stores the recycled fuel, And a square pipe that is disposed between the side surfaces of the coupling body facing each other and that engages with the coupling member.

  In this recycled fuel assembly storage basket, plate members are stacked and connected by connecting members to form a plate member connecting body, and a plurality of plate member connecting bodies are arranged so that the connecting members face each other. To do. And a square pipe is arrange | positioned between plate-shaped member coupling bodies, and the corner | angular part outside a square pipe is arrange | positioned in the part formed with a connection member and the side surface of a plate-shaped member. The plate-shaped member, the square pipe and the connecting member, which are members constituting the recycled fuel assembly storage basket, can be manufactured by, for example, extrusion molding. Therefore, according to the recycled fuel assembly storage basket according to the present invention, cutting of members constituting the recycled fuel assembly storage basket can be reduced.

  As a desirable mode of the present invention, in the recycled fuel assembly storage basket, it is preferable that the plate-like member has a through hole penetrating in a longitudinal direction thereof. Thereby, in particular, in a basket storing a recycled fuel assembly for PWR (Pressurized Water Reactor), the through hole can be used as a flux trap for decelerating fast neutrons from the recycled fuel assembly.

  As a desirable mode of the present invention, in the recycled fuel assembly storage basket, the connecting member has a rectangular cross section perpendicular to the longitudinal direction, and one long side in the cross section is a side surface of the plate-like member. It is preferable to contact with. This simplifies the shape of the connecting member and facilitates the manufacture of the connecting member.

  As a desirable mode of the present invention, in the recycled fuel assembly storage basket, the connecting member is preferably divided at different positions in the direction in which the plate-like members are stacked. In this way, the connecting member is divided at the different positions in the stacking direction of the plate-like members, that is, in the longitudinal direction of the connecting member, and is attached to the side surface of the plate-like member, and is connected to the plate-like member. Configure the body (partition). Thereby, since the full length of the connecting member, that is, the dimension in the longitudinal direction can be shortened, the influence due to the difference in thermal elongation caused by the difference between the material of the connecting member and the material of the plate member can be alleviated.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, the connecting member is preferably attached to the plate-like member by fastening means. Thereby, the connecting member can be securely fixed to the plate-like member, and the plurality of plate-like members can be reliably connected.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, a long hole penetrating a long side of a cross section perpendicular to the longitudinal direction of the connecting member is provided, and the fastening means is the long hole. It is preferable to pass through. Since the long hole leaves room for the connecting member to be displaced with respect to the fastening means, relative movement between the connecting member and the plate-like member is allowed. As a result, the thermal stress generated due to the difference in thermal elongation when the material of the connecting member and the material of the plate-like member are different can be alleviated.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, a load from the square pipe is applied between the fastening means and the connecting member and between the fastening means and the plate-like member. It is preferable that load supporting means for supporting is interposed. As a result, the load transmitted from the square pipe to the fastening means via the connecting member can be received by the load support means, so that the stress acting on the fastening means can be suppressed.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, at least one of the load support means and the plate member and the load support means and the connecting member may include the load. It is preferable that a rotation suppressing member for suppressing the rotation of the support means is provided. For example, when a key having a circular cross section is used for the load support member, rotation of the load support means is suppressed by the rotation suppression member, so that the operation of attaching the connecting member and the plate member by the fastening means is facilitated. This improves work efficiency.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, a reinforcing member made of a material having rigidity higher than that of the plate member is disposed inside the through hole of the plate member, It is preferable to couple the reinforcing member and the fastening means. With such a configuration, a part of the load acting on the plate member can be received by the reinforcing member, so that the recycled fuel assembly storage basket can be configured more firmly. For example, when a bolt or a screw is used as the fastening means, it is coupled with a nut. However, according to this configuration, it is not necessary to process a screw hole in the plate-like member.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, a groove is formed on a side surface of the plate member in a direction in which the plurality of plate members are stacked, and the connecting member is formed in the groove. It is preferable to be fitted. Thereby, the load input from the connecting member to the plate-like member can be received at the portion where the connecting member and the groove are engaged. As a result, since the load acting on the fastening means for fixing the connecting member to the plate-like member can be greatly reduced, the fastening means can be reduced in size or the number of fastening means can be reduced.

  As a desirable aspect of the present invention, in the recycled fuel assembly storage basket, a cutout portion is formed in a corner portion on the outer side of the square pipe in a longitudinal direction of the square pipe, and the connecting member The cross section perpendicular to the longitudinal direction is formed in a trapezoidal shape, and the upper bottom side surface in the cross section is attached to the side surface of the plate-like member connection body, and the notch portion of the square pipe is It is preferable to be engaged with the connecting member. Thereby, the shift | offset | difference between a square pipe and a plate-shaped member coupling body can be suppressed.

  In order to solve the above-described problems and achieve the object, a recycled fuel assembly storage container according to the present invention includes a trunk having an opening and a cavity, and a lid attached to the opening to seal the cavity. And the recycled fuel assembly storage basket disposed in the cavity.

  Since the recycled fuel assembly storage container includes the recycled fuel assembly storage basket according to the present invention, cutting of members constituting the recycled fuel assembly storage basket can be reduced.

  In order to solve the above-described problems and achieve the object, a method for manufacturing a recycled fuel assembly storage basket according to the present invention stacks a plurality of plate-like members with their long side end portions in contact with each other. A plurality of plate-like members, a plurality of plate-like members connected to each other by a connecting member that is attached to a side surface of the plate-like member and protrudes from the side surface; Including a procedure for arranging side surfaces of the member coupling body facing each other and arranging the coupling members to face each other, and a procedure for arranging the square pipe between the plate-like member coupling bodies facing each other. To do. According to this method for manufacturing a recycled fuel assembly storage basket, cutting of members constituting the recycled fuel assembly storage basket can be reduced.

  The present invention can reduce cutting of members constituting the recycled fuel assembly storage basket.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the best mode for carrying out the invention (hereinafter referred to as an embodiment). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or that are substantially the same, that is, that are within a so-called equivalent range. The recycled fuel assembly storage basket described below is mainly used for transport and storage cask, but is not limited to this. For example, it can be used as a concrete cask for storage, or a rack of a canister or a recycled fuel assembly storage pool. The present invention can be applied to a recycled fuel assembly used for both PWR and BWR (Boiling Water Reactor).

(Embodiment 1)
In the first embodiment, the long-side end portions of a plurality of plate-like members are brought into contact with each other and stacked, and a connecting member is attached to the side surface of the stacked plate-like members to connect the plurality of plate-like members to form a plate shape. Forms a member connection body, and further has a hole penetrating in the longitudinal direction between the plate-like member connection bodies arranged opposite to each other, and has an inner shape of a cross section and an outer shape of a cross section perpendicular to the longitudinal direction. A square pipe having a quadrangular shape (in this embodiment, the inner shape of the cross section is square) is arranged and engaged with a connecting member protruding from the side surface of the plate-like member, thereby constituting a recycled fuel assembly storage basket. A feature is that the recycled fuel assembly is stored in the through hole of the square pipe. Before describing the recycled fuel assembly storage basket according to the first embodiment, the recycled fuel assembly storage container will be described. In the following description, the recycled fuel assembly storage basket is abbreviated as a basket as necessary.

  FIG. 1 is a cross-sectional view showing an outline of a cask that is an example of a recycled fuel assembly storage container. 2 is a cross-sectional view taken along line AA of the cask shown in FIG. As shown in FIG. 1, the cask 200 includes a lid 200T and a barrel 200B. The recycle fuel assembly is housed inside the barrel 200B and then sealed by the lid 200T. As shown in FIG. 2, the trunk 200 </ b> B of the cask 200 has a cylindrical trunk main body 201, a heat transfer fin 207 attached to the outer periphery of the trunk main body 201, and the other long side end of the heat transfer fin 207. The outer cylinder 205 to be attached, and the outer periphery of the trunk 200 </ b> B, the neutron shielding material 209 filled in the space formed by the heat transfer fins 207 and the outer cylinder 205 are configured. The trunk body 201 is made of carbon steel or stainless steel having a sufficient thickness in order to exhibit the function of shielding γ rays. In addition, when manufacturing the trunk | drum main body 201 with carbon steel, in order to exhibit sufficient gamma ray shielding function, the thickness of the trunk | drum main body 201 shall be 20-30 cm.

  The trunk body 201 can be configured by attaching a bottom plate to the cylindrical trunk body 201 by welding. Also, a metal billet is placed in a container having an internal shape that matches the outer shape of the barrel body 201, and the metal billet is hot-formed by a punching punch having an outer shape that matches the inner shape of the barrel body 201. The main body 201 and the bottom plate may be formed into one body. Furthermore, you may manufacture the trunk | drum main body 201 by casting.

  The interior of the trunk body 201 serves as a cavity 201C in which the basket 1 that stores the recycled fuel assembly is stored. The shape in the cross section perpendicular to the axis (cavity axis Z) direction of the cavity 201C is circular, but according to the specifications of the cask 200, the cavity has a shape in the cross section such as an octagon, a quadrangle, a substantially cross shape, and a step shape. Can also be used. In the present embodiment, since the shape of the cavity 201C in the cross section is circular, when storing the basket 1 having a polygonal outer shape, the first spacer 202a to the fifth spacer 202e are placed between the basket 1 and the cavity 201C. The basket 1 is positioned in the cavity 201C. The first spacer 202a to the fifth spacer 202e are provided with grooves in which the plate-like members constituting the basket 1 are fitted, and the first spacer 202a to the fifth spacer 202e and the plate-like member are shrink-fitted or cold-fitted. You may combine by etc.

  Here, the basket 1 preferably has its outer peripheral surface in contact with the inner wall of the cavity 201C. As a result, heat can be transferred with a small temperature difference since heat transfer with the container is performed in a wide area while ensuring a subcritical function. As a result, the temperature of the stored item can be kept low even when the B-SUS material, which is inferior in heat conductivity, is used as compared to the B-Al material. Can be kept lower.

After the recycled fuel assembly is stored in the cavity 201C, the primary lid 200T ₁ , the secondary lid 200T _2, and the tertiary lid T ₃ (FIG. 1) are used to prevent leakage of radioactive materials from the cavity 201C. Attach to the opening of the barrel and seal the cavity 201C. In order to ensure sealing performance, a gasket made of metal or elastomer or a metal and elastomer is provided between the primary lid 200T ₁ and secondary lid 200T ₂ and the trunk body 201. The tertiary lid T ₃ is used for the purpose of further backing up the primary lid T ₁ and the secondary lid T ₂ , but this lid structure may be up to the primary lid or the secondary lid depending on the required specifications.

  A plurality of heat transfer fins 207 made of a plate-like member are radially attached to the outer periphery of the trunk body 201. The heat transfer fins 207 are made of a good heat conductor such as an aluminum plate or a copper plate, and heat is transferred well to the outer periphery of the trunk body 201 by welding or other joining means. An outer cylinder 205 made of carbon steel having a thickness of several centimeters is attached to the outside of the heat transfer fin 207 by welding or other joining means. The recycled fuel assembly accommodated in the cavity 201C generates decay heat. This decay heat is transmitted to the outer cylinder 205 through the heat transfer fins 207 after being transmitted through the basket 1 and the trunk body 201, and released from the surface of the outer cylinder 205 to the atmosphere.

  A space surrounded by the trunk body 201, the outer cylinder 205, and the two heat transfer fins 207 is filled with a material having a neutron shielding function (neutron shielding material 209) in order to shield neutrons. As a material having such a function, a polymer material containing a large amount of hydrogen, such as resin, polyurethane, silicon, or other neutron shielding materials can be used. With this neutron shielding material, neutrons emitted from the recycled fuel assembly are shielded, and neutrons leaking to the outside of the cask 200 are reduced below the regulation value.

  The cask 200 is used for transporting and storing after storing the recycled fuel assembly. In the case of transporting the cask, as shown in FIG. 1, even when a shock absorber 204 is attached to both ends in the direction of the cask axis, that is, the cavity axis Z, and the cask 200 is accidentally dropped, It is possible to ensure sufficient sealing performance of the container and soundness of the stored items. Next, the basket according to this embodiment will be described.

  FIG. 3 is a perspective view showing the basket according to the first embodiment. FIG. 4 is a cross-sectional view showing a portion where the connecting member is attached to the plate-like member in the basket according to the first embodiment. FIG. 5 is a partially enlarged view showing the basket according to the first embodiment. FIG. 6A is a side view of a plate-like member constituting the basket according to the first embodiment. FIG. 6-2 is a front view of a plate-like member constituting the basket according to the first embodiment. FIGS. 6-3 to 6-5 are front views illustrating modifications of the plate-like member constituting the basket according to the first embodiment. FIG. 7 is a front view showing a modification of the plate-like member constituting the basket according to the first embodiment. FIG. 8-1 is a side view of a square pipe constituting the basket according to the first embodiment. FIG. 8-2 is a front view of a square pipe constituting the basket according to the first embodiment. FIG. 9-1 is a perspective view of a connecting member constituting the basket according to the first embodiment. FIG. 9-2 is a cross-sectional view of the connecting member constituting the basket according to the first embodiment.

  The basket 1 is configured by combining a plate-shaped member 10, a square pipe 20, and a connecting member 30. As illustrated in FIGS. 6A and 6B, the plate-like member 10 is a member having a rectangular shape in a side view, and has four end portions. The two ends corresponding to the long sides of the plate-like member 10 in the side view are the long-side end portions 10LT1 and 10LT2, and the two ends corresponding to the short sides of the plate-like member 10 in the side view are the short side. This is the end 10ST. The long side end 10LT1 is provided with a protrusion (projection) 11 extending in the longitudinal direction of the plate-like member 10, and the long side end 10LT2 is fitted with the protrusion 11 extending in the longitudinal direction of the plate-like member 10. A matching groove 12 is provided.

  The long side end portion 10LT2 is provided with leg portions 15 which are two protrusions extending in the longitudinal direction of the plate-like member, and a portion surrounded by the leg portions 15 becomes the groove portion 12. As shown in FIG. 3, when the long side end portions 10LT1 and 10LT2 of the plate-like member are brought into contact with each other and stacked, the protrusion 11 of the long side end portion 10LT1 and the groove portion 12 of the long side end portion 10LT2 are formed. Fitted together. At this time, the leg portion 15 of the long side end portion 10LT2 contacts the shoulder portion 11a of the long side end portion 10LT1.

  The side surface 10S of the plate-like member 10 is provided with a screw hole 10H for attaching the connecting member 30 with a bolt 40 which is a fastening means for attaching the connecting member 30 to the plate-like member 10. Moreover, the plate-shaped member 10 is provided with the through-hole 13 which goes to a longitudinal direction. In the present embodiment, two through holes 13 are provided in the plate member 10. The two through holes 13 are partitioned by partition portions (ribs) 14 provided inside the plate-like member 10. Thereby, the strength of the plate-like member 10 in the thickness direction of the plate-like member 10, that is, the direction orthogonal to the side surface 10S of the plate-like member 10 is improved. The through-hole 13 functions as a neutron flux trap.

  As a modified example of the plate-like member, there are three through-holes 13B, such as one plate-like member 10A shown in FIG. 6-3 and one plate-like member 10B shown in FIG. 6-4. There are two things. This through hole 13B selects the shape and number of the through holes 13B so that the strength in the direction orthogonal to the side surface 10S of the plate member 10A is not impaired by the height h in the direction in which the plate members 10A are stacked. Moreover, like the plate-like member 10C shown in FIG. 6-5, the groove portions 12C are provided at both long side end portions, and the plate-like members 10C are stacked via the members 11C that can fill the adjacent groove portions 12C. May be.

  As shown in FIG. 7, the reinforcing member 50 may be disposed in the through hole 13 of the plate-like member 10. The reinforcing member 50 is made of a material having higher rigidity than the plate-like member 10, and the length of the reinforcing member 50 (dimension in the longitudinal direction of the reinforcing member 50) is substantially the same as the entire length of the through hole 13. Thus, by arranging the reinforcing member 50 having higher rigidity than the plate-like member 10 in the through hole 13, the strength of the plate-like member 10 against bending can be further improved. For example, when an aluminum material containing boron, which will be described later, is used for the plate member 10, stainless steel is used for the reinforcing member 50. Moreover, it is good also as what considered the flux trap function using the hollow-shaped reinforcement member 50a provided with the through-hole penetrated to a longitudinal direction. Furthermore, if the reinforcing member 50 or the reinforcing member 50a is inserted only at a certain interval, for example, at a position in contact with the lattice of the recycled fuel assembly, and the other portions are only the plate-like member 10, an increase in the mass of the basket 1 can be suppressed. .

  As shown in FIGS. 8A and 8B, the square pipe 20 is a member having a rectangular shape in a side view, and is a cylindrical structure provided with a through hole 20I extending in the longitudinal direction. The through hole 20I serves as a cell for storing the recycled fuel assembly. The square pipe 20 has a square inner shape in a cross section perpendicular to the longitudinal direction thereof (that is, a direction in which the through hole 20I passes through the square pipe 20), and an outer shape of the cross section is a rectangle. The outer shape of the cross section is a rectangle, and the side surface 20S1 and the side surface 20S2 are orthogonal to each other, and the portion where both are orthogonal is the corner portion 20C. The square pipe 20 has four corners 20C.

  As shown in FIG. 3, the plate-like members 10 are stacked in a plurality of stages, and are connected by a connecting member 30 extending in the direction in which the plate-like members 10 are stacked to constitute a plate-like member connection body (partition wall) 100. At this time, a plurality of connecting members 30 are arranged and arranged in a direction orthogonal to the direction in which the plate members 10 are stacked, that is, in the longitudinal direction of the plate members 10. That is, the plate-like member connection body 100 configured by stacking the plurality of plate-like members 10 is connected by the plurality of connection members 30.

  The plate-like member coupling body (partition wall) 100 configured as described above is arranged to face each other. And the square pipe 20 is arrange | positioned between the plate-shaped member coupling bodies 10 in the state arrange | positioned facing the connection members 30 attached to each plate-shaped member coupling body 100. FIG. At this time, as shown in FIG. 5, the corner portion 20 </ b> C of the square pipe 20 is in contact with the side surface 10 </ b> S of the plate-shaped member 10, that is, the portion formed by the side surface of the plate-shaped member coupling body 100 and the coupling member 30. A square pipe 20 is arranged. Of the side surfaces 20S1 and 20S2 of the square pipe 20, the side surface 20S1 that does not face the side surface 20S of the adjacent square pipe 20 is in contact with the side surface 10S of the plate member 10. As a result, the heat transfer between the square pipe 20 and the plate-like member 10 is improved, so that the heat from the recycled fuel assembly stored in the through hole 20I of the square pipe 20 is transferred from the plate-like member 10 to the basket 1. It becomes easy to discharge outside. The side surface 20S2 is a side surface facing the side surface 20S of the adjacent square pipe 20.

  In this structure, since the connecting member 30 can be provided at an arbitrary position, it is possible to stack cells at different positions, which was not possible with the conventional structure (for example, FIGS. 21 to 23 of JP-A-2001-166089). it can. Further, in the conventional structure (for example, FIGS. 21 to 23 of JP-A-2001-166089), there are many joints from the central part of the basket to the outer peripheral surface, and heat transfer from the central part region of the basket to the outer peripheral part. In the structure of the basket 1 shown in FIG. 3, the plate-like member 10 is composed of one plate-like member from the central portion of the basket 1 to the outer peripheral surface. Heat transfer from the central region to the outer peripheral portion is facilitated.

  In yet another conventional structure (for example, FIG. 22 of Japanese Patent Application Laid-Open No. 2004-069620), when cells are stacked at different positions, the joining surface of the plate-like members becomes small, and the central region of the basket extends from the central region to the outer peripheral portion. Heat transfer is not easy. Further, even when the plate-like members are aligned and stacked, there are many joints from the central portion of the basket to the outer peripheral surface, and there is a possibility that heat transfer from the central region of the basket to the outer peripheral portion may be hindered. In the structure of the basket 1 shown in FIG. 3, the plate-like member 10 constituting the cell is constituted by one plate-like member 10 from the central portion of the basket 1 to the outer peripheral surface. Heat transfer to the outer periphery becomes easy.

  Further, in another conventional structure (for example, FIG. 2 of JP-A-2004-020568), cells can be stacked at different positions, but a recess is provided in a component of the basket for an engaging portion. Thus, the depth of the recess is removed from the thickness of the plate. As a result, the heat transfer area may be reduced and the mechanical rigidity may be reduced. On the other hand, in the structure of the basket 1 shown in FIG. 3, the plate-like member 10 and the square pipe 20 are not provided with large concave portions (deep notches, large notches, etc.), so that heat transfer performance and mechanical rigidity are good. Become.

The plate-like member 10 and the square pipe 20 are manufactured from an Al (aluminum) material containing B ¹⁰ (boron) (hereinafter referred to as boron-aluminum material) (hereinafter the same) for securing a subcritical function and reducing the weight. . B may be a boron compound such as B ₄ C (boron carbide). The plate-like member 10 and the square pipe 20 can be manufactured, for example, by hot rolling or hot extrusion molding a boron aluminum billet manufactured by powder metallurgy.

  A space surrounded by the side surfaces 20S2 and 20S2 of the adjacent square pipes 20 and the connecting members 30 and 30 facing each other serves as a flux trap FL for decelerating fast neutrons from the recycled fuel assembly. In the present embodiment, the thickness of the side portion having the side surface 20S1 that contacts the plate-like member 10 of the square pipe 20 is t, and the thickness of the side portion having the side surface 20S2 that does not contact the plate-like member 10 of the square pipe 20 is 2t. Further, the thickness of the plate member 10 on the side in contact with the square pipe 20 is t. The sum of the thickness of the side portion having the side surface 20S1 in contact with the plate member 10 of the square pipe 20 and the thickness of the plate member 10 on the side in contact with the square pipe 20 is 2t. It becomes equal to the thickness of the side portion having the side surface 20S2 that does not contact. Thus, when the recycled fuel assembly is stored in the through hole 20I (cell) of the square pipe 20, the thickness of the boron-aluminum material arranged around the recycled fuel assembly can be made substantially equal.

  As illustrated in FIGS. 9A and 9B, the connecting member 30 has a first side surface 30A and a second side surface 30B that are parallel to each other, and a cross section perpendicular to the longitudinal direction is rectangular. The first side surface 30A and the second side surface 30B are surfaces that face each other. The second side surface 30B of the connecting member 30 is in contact with the side surface 10S of the plate-like member 10 shown in FIGS. A bolt through hole 31 through which the bolt 40 passes is formed in the first side surface 30A. The bolt through hole 31 is a long hole and is subjected to spot facing. As a result, as shown in FIG. 4, when the bolt 40 is passed through the bolt through hole 31 and the connecting member 30 is fastened and attached to the plate-like member 10, the head of the bolt 40 is hidden in the bolt through hole 31 and connected. It can be avoided that the head of the bolt 40 protrudes from the first side surface 30 </ b> A of the member 30.

  Further, the depth of the bolt through hole 31 is such that when the bolt 40 is tightened with a normal torque, the head of the bolt 40 becomes invisible from the surface of the first side surface 30A of the connecting member 30 or the head of the bolt 40 By making the depth such that the bolt slightly protrudes, the soundness of the operation of fastening the bolt 40 can be confirmed only by confirming the presence or absence of the bolt 40 and the presence or absence of the protrusion from the surface of the first side surface 30A. Thereby, since it is possible to confirm the work of fastening the bolt 40, which is not easy, in a short time, the assembly work of the basket 1 can be completed in a short time.

  In addition, since the bolt through hole 31 is a long hole, there remains room for the connecting member 30 to be displaced with respect to the bolt 40, so that relative movement between the connecting member 30 and the plate-like member 10 is allowed. As a result, the thermal stress generated due to the difference in thermal elongation when the material of the connecting member 30 and the material of the plate-like member 10 are different can be alleviated. A specific one of the holes for attaching the bolts 40 may be a simple circular hole instead of a long hole, and the positions of the plate member 10 and the connecting member 30 may be determined. In this case, by setting the position of a simple circular hole to which the bolt 40 is attached to a position that is approximately half the total length of the connecting member 30, the thermal stress generated in the connecting member 30 due to the thermal expansion of the plate-like member 10 can be reduced. It can be made smaller than when all the holes are elongated holes.

  10-1, FIG. 10-2, and FIG. 10-3 are explanatory views showing a plate-like member connection body in which plate-like members are stacked and connected by a connecting member. FIG. 10-4 is an explanatory diagram of another configuration example of the plate-like member connection body. The plate-like member coupling body 100 is configured such that a plurality of plate-like members 10 are stacked with their long-side end portions in contact with each other, and the connecting member 30 is attached to the side surface of the plate-like member 10. 10 are connected and integrated. At this time, as shown in FIGS. 1 and 5, the connecting member 30 protrudes from the side surface 10 </ b> S of the plate-like member 10. A plurality of connecting members 30 are attached at predetermined intervals in the longitudinal direction of the plate-like member 10. Thereby, the square pipes 20 arranged between the plate-like member coupling bodies 100 are arranged at the predetermined interval. The direction in which the plurality of plate-like members 10 are stacked is the direction of the cavity axis Z.

  In the plate-like member connection body 100 shown in FIG. 10A, the length in the longitudinal direction of the connection member 30 is substantially equal to the total length in the direction in which the plate-like members 10 are stacked. As a result, a single connection member 30 connects the front stage of the plate-shaped member connection body 100 configured by stacking the plate-shaped members 10 in a plurality of stages.

  The assembling of the basket 1 having this configuration is not limited to the posture in which the basket 1 heading from the floor surface to the heaven is upright, and the handling of the plate-like member 10 and the square pipe 20 constituting the basket 1 is considered. When assembled in a posture parallel to the floor surface, the worker can easily access the basket 1. In addition, if the basket 1 is assembled with a posture in which the foreign matter does not easily remain in the cell with a slight inclination with respect to the floor surface, it is effective to avoid the foreign matter remaining in the cell.

  10-2, the dimension of the longitudinal direction of the connection member 30 is shorter than the full length of the direction where the plate-shaped member 10 is stacked. That is, the connecting member 30 is divided at different positions in the direction in which the plate-like members 10 are stacked. This means that the connecting member 30 is divided at different stages of the plate-like members 10 stacked in a plurality of stages. For example, the connecting member 30 at the position A in FIG. 10-2 is divided between the (2) stage and the (3) stage, and the connecting member 30 at the position B is the (3) stage. And the connection member 30 at the position C is divided between the (4) stage and the (5) stage. Thus, by dividing the connecting member 30 at different positions in the direction in which the plate-like members 10 are stacked, that is, by dividing the connecting member 30 at different positions in the longitudinal direction of the connecting member 30, That is, since the dimension in the longitudinal direction can be shortened, the influence due to the difference in thermal elongation caused by the difference between the material of the connecting member 30 and the material of the plate-like member 10 can be mitigated. The connecting member 30 is divided in consideration of the common use of the members. If the plate-like member 10 is consolidated to a length connecting two, three, and four stages, the number of parts can be reduced. When the difference in thermal expansion between 10 and the connecting member 30 is small, the number of stages may be increased (for example, 4 stages to 6 stages). Further, as shown in FIG. 10C, if the dividing position of the connecting member 30 is set to the center of the plate-like member 10 in the cavity axis Z direction, all the connecting members 30 can contribute to the connection of the plate-like members 10. It is more preferable.

  As shown in FIG. 10-4, the long side end of the plate-like member 10 is inclined with respect to the bottom B of the cavity 201C (FIGS. 1 and 2) and connected by the connecting member 30 to connect the plate-like member. The body 100a may be configured. In this case, a spacer S having an inclined surface is arranged between the plate-like member coupling body 100a and the bottom B. This is preferable because drainage from the through hole 13 (see FIG. 6B) formed inside the plate-like member 10 becomes easy.

  The basket 1 shown in FIG. 3 is assembled and manufactured by the following procedure, for example. First, the plurality of plate-like members 10 are stacked by fitting the protrusions 11 of the long side end 10LT1 with the grooves 12 and the protrusions 11 of 10LT2. Next, the plurality of plate-like members 10 are connected to the side surface 10S of the plate-like member 10 by connecting the connection members 30 to form a plurality of plate-like member coupling bodies 100 (partition walls). At this time, the connecting member 30 protrudes from the side surface 10 </ b> S of the plate-like member 10. As shown in FIGS. 3 and 4, the connecting member 30 is attached to the plate-like member 10 with bolts 40.

  Next, the side surfaces of the plurality of plate-like member coupling bodies 100 are arranged to face each other and the coupling members 30 are opposed to each other. And the square pipe 20 is arrange | positioned between the plate-shaped member coupling bodies 100 which oppose. The basket 1 is assembled by such a procedure. And the through-hole 20I of the square pipe 20 becomes a cell in which the recycled fuel assembly is stored. The basket 1 assembled in this way is provided with only the screw holes 10H on the side surface 10S of the plate-like member 10, and does not insert other plate-like members by performing groove processing. Therefore, the possibility that the rigidity of the plate-like member 10 is impaired can be extremely reduced. Thereby, the soundness of the basket 1 is sufficiently secured.

  The basket 1 shown in FIG. 3 is composed of a plate-like member 10 and a square pipe 20 made of a boron-aluminum material having neutron absorption capability. For example, the plate-like member 10 and the square pipe 20 are made of neutron absorption capability. You may comprise with the usual aluminum alloy and stainless steel which do not have. In this case, a material having a capability of absorbing neutrons (such as a boron plate or a stainless steel plate containing boron) is separately disposed on the inner surface of the cell and on the side surfaces of the opposing plate members.

  11A and 11B are plan views of the basket according to the first embodiment. The basket 1 shown in FIG. 11A includes 24 square pipes 20. That is, the basket 1 includes 24 cells that store the recycled fuel assemblies. # 1 to # 24 indicate cells. In this basket 1, a plurality of square pipes 20 are arranged in the longitudinal direction of the plate-like member 10 to constitute a cell row. There is no deviation between adjacent cell rows.

  The basket 1 ′ illustrated in FIG. 11B includes 26 square pipes 20. That is, the basket 1 ′ includes 26 cells that store the recycled fuel assemblies. # 1 to # 26 indicate cells. In the basket 1 ′, a plurality of square pipes 20 are arranged in the longitudinal direction of the plate-like member 10 to constitute a cell row. Then, the cell rows adjacent to the outside from the center are arranged with a shift of half the cell arrangement pitch. In the basket disclosed in Patent Document 1 described above, such a cell arrangement is impossible, but in the present embodiment, the basket-shaped member 10 and the square pipe 20 are combined to constitute the basket 1 ′. Such a cell arrangement is also possible. With such a cell arrangement, even if the outer diameter Da of the basket 1 and the outer diameter Db of the basket 1 'are the same, the number of cells can be increased. The basket 1 ′ shown in FIG. 11-2 is a case that can accommodate a large amount of recycled fuel assemblies when compared to a basket that cannot allow deviation because the adjacent cell rows are arranged at different positions. Take advantage of the benefits.

  For example, when the cask 200 shown in FIGS. 1 and 2 falls in the Y direction, the load from the recycled fuel assembly stored in the cell is transmitted to the square pipe 20 and then from the connecting member 30 via the bolt 40. It is transmitted to the plate member 10. At this time, since one square pipe 20 and a pair of connecting members 30 need only receive a load from one recycled fuel assembly, it is easy to ensure the soundness of the basket 1. When the basket 1 ′ shown in FIG. 11-2 falls in the Y direction, the plate-like member 10 does not have a large notch that is half of the member (see the plate-like member of Patent Document 1). Since the original strength and rigidity of the plate-like member 10 are maintained, the amount of displacement of the plate-like member can be reduced, and the plate-like member can be easily assembled. Even if the plate-like member 10 according to the present embodiment has the same size and the same thickness as the plate-like member of Patent Document 1, there is no large notch that is half of the plate-like member. It has about twice the strength of the plate-like member of Patent Document 1, and can handle the load.

  When the basket 1 'shown in FIG. 11-2 falls in the X direction, the load from the square pipe 20 input to the side surface of the plate member 10 becomes a problem. Because there is no large notch that is half of (see the plate-like member of Patent Document 1), it can sufficiently withstand the load (the load from the square pipe 20 or the recycled fuel assembly) that is to deflect the plate-like member 10. be able to. Thereby, the load can be effectively dispersed.

  Even if the plate-like member 10 according to the present embodiment has the same size and the same thickness as the plate-like member of Patent Document 1, there is no large notch that is half of the member. It has about twice the strength of one plate-like member and can handle the load in the X direction. Thereby, the soundness of the basket 1 can be ensured. Further, as shown in FIG. 7, the strength of the plate member 10 as a whole can be improved by arranging the reinforcing member 50 in the through hole 13 of the plate member 10 as shown in FIG. The soundness of the basket 1 can be secured.

  Since the plate-like member 10 constituting the basket 1 is arranged so as to cross a direction parallel to the radial direction of the baskets 1 and 1 ′ (the radial direction of the cavity 200C shown in FIG. 2), the heat conductivity is very high. It is good. For this reason, the heat transferability of the entire basket 1, 1 'can be sufficiently ensured. Further, between the square pipe 20 and the connecting member 30 or between the square pipe 20 and the plate-like member 10, a material having high thermal conductivity, for example, a metal paste such as silver paste or copper paste, carbon paste, or the like is used. A heat transfer promoting layer may be provided. As a result, the heat transfer performance between the square pipe 20 and the plate-like member 10 is improved, so that the heat transfer performance of the entire basket 1, 1 ′ can be further improved. The heat transfer promoting layer such as a metal paste such as a silver paste or a copper paste or a carbon paste can eliminate a possibility of material loss due to galling that occurs when the square pipe 20 is assembled to the basket 1. Therefore, it is desirable to form such a heat transfer promoting layer.

  11-3 is explanatory drawing which shows the modification of the attachment structure of a connection member and a plate-shaped member. This attachment structure is an attachment structure between the connecting member 30 and the plate-like member 10 when the reinforcing member 50 is disposed in the through hole 13 of the plate-like member 10 shown in FIG. In this mounting structure, a screw hole 50H into which the bolt 40 is screwed into the reinforcing member 50 is formed. Then, the connecting member 30 is attached to the plate-like member 10 by screwing the bolt 40 having passed through the bolt through hole 31 of the connecting member 30 into the screw hole 50H. According to this mounting structure, the nut to be coupled with the bolt 40 is not required, so that the troublesome work of holding the nut and coupling with the bolt at a deep position of the through hole 13 of the plate-like member 10 is not required. The score can be reduced. In FIG. 11C, the screw hole of the reinforcing member 50 is expressed by using the bolt 40, but the screw hole 50H is easier to thread when the reinforcing member 50 is passed through. When the cell row is provided at a position deviated from the adjacent cell row as in 11-2, the screw hole 50H may not penetrate the reinforcing member 50.

  As described above, in the present embodiment, the long side end portions of the plurality of plate-shaped members are brought into contact with each other and stacked, and the connecting members are attached to the side surfaces of the stacked plate-shaped members to connect the plurality of plate-shaped members, A plate-shaped member coupling body is constituted. And a square pipe is arrange | positioned between the plate-shaped member coupling body arrange | positioned facing, and a basket is comprised. Thereby, for example, after the plate-like member, the square pipe and the connecting member constituting the basket are manufactured by extrusion molding, the basket can be assembled by subjecting them to simple processing such as perforation. As a result, cutting of members constituting the basket can be greatly reduced. As a result, even when the members constituting the basket are made of a difficult-to-cut material such as boron-aluminum, the basket can be manufactured relatively easily, and waste of materials due to cutting can be suppressed. Thereby, the processing cost can be reduced.

(Embodiment 2)
The second embodiment has substantially the same configuration as that of the first embodiment, but the load from the square pipe, that is, the length of the connecting member is between the fastening means and the connecting member and between the fastening means and the plate-like member. The difference is that load supporting means for supporting a load in a direction orthogonal to the direction is provided. Other configurations are the same as those of the first embodiment.

  FIG. 12 is a perspective view showing a basket according to the second embodiment. FIG. 13 is a cross-sectional view showing a portion for attaching the connecting member to the plate-like member in the basket according to the second embodiment. FIG. 14 is a perspective view showing a connecting member constituting the basket according to the second embodiment. As shown in FIGS. 12 and 13, a load support key 41 as a load support means is provided between the bolt 40 as the fastening means and the connecting member 30 and between the bolt 40 and the plate-like member 10. . The load support key 41 is a cylindrical member and has a through hole 41H penetrating in the longitudinal direction. A screw into which the bolt 40 is screwed is formed at both ends of the through hole 41H. Thus, the load support key 41 has an outer diameter larger than the outer diameter of the bolt 40. Here, the load support key 41 may use the same material as that of the connecting member 30 or a different material. In this embodiment, the load support key 41 uses stainless steel, which is the same material as the connecting member 30, but the connecting member 30 is stainless steel as long as it is a high-strength material capable of receiving a large load with a small area. The present invention can be applied without being limited to, and the effects of the second embodiment can be obtained.

  As shown in FIG. 14, a key receiving recess 32 into which the load support key 41 is fitted is provided on the second side surface 30 </ b> B of the connecting member 30. The portion of the key receiving recess 32 into which the load support key 41 is fitted has a shape that matches the outer shape of the load support key 41. In the present embodiment, the load support key 41 has a cylindrical shape. That is, since the outer shape of the cross section perpendicular to the longitudinal direction of the load support key 41 is circular, the inner shape of the key receiving recess 32 is circular. When the outer shape of the cross section perpendicular to the longitudinal direction of the load support key 41 is a rectangle, the inner shape of the key receiving recess 32 is a rectangle. In this way, when the bolt 40 is screwed in, the rotation of the load support key 41 is suppressed to facilitate the work, and the load from the square pipe 20 transmitted via the connecting member 30 is reliably loaded. This is transmitted to the support key 41.

  The plate-like member 10 is formed with a key through hole 10H2 through which the load support key 41 passes. The key through hole 10 </ b> H <b> 2 has a shape that matches the outer shape of the load support key 41. In the present embodiment, the outer shape of the cross section perpendicular to the longitudinal direction of the load support key 41 is circular, so the inner shape of the key through hole 10H2 is circular. When the outer shape of the cross section perpendicular to the longitudinal direction of the load support key 41 is a rectangle, the inner shape of the key through hole 10H2 is a rectangle. By doing in this way, the load from the plate-like member 20 transmitted to the load support key 41 is reliably transmitted to the plate-like member 10.

  In attaching the connecting member 30 to the side surface 10S of the plate-like member 10, first, the load support key 41 is inserted into the key through hole 10H2 formed in the plate-like member 10, and the load support key 41, the plate-like member 10, Mate. Then, the key receiving recess 32 of the connecting member 30 is fitted into the end portion of the load supporting key 41 protruding from the side surface 10S of the plate-like member 10, and the connecting member 30 and the load supporting key 41 are fitted. Thereafter, the bolt 40 is screwed into screws formed at both ends of the load support key 41, and the connecting member 30 is attached to the side surface 10 </ b> S of the plate-like member 10 with the bolt 40. The screw formed on the load support key 41 may be formed only at both ends, or if it is processed from one side to a through screw, processing from one side is sufficient, so workability when assembling the basket can be improved. In addition, when confirming that no foreign matter is attached to the screw formed on the load support key 41, since the screw can be seen through when processed into a through screw, the presence or absence of foreign matter can be easily confirmed visually. Workability when assembling can be improved.

  When the connecting member 30 is attached to the plate-like member 10 only by the bolt 40, it is necessary to receive all the load from the square pipe 20 with the bolt 40, and it is necessary to increase the diameter of the bolt 40. However, since the width of the connecting member 30, that is, the dimension in the direction perpendicular to the longitudinal direction of the connecting member 30 needs to be smaller than the thickness of the square pipe 20, there is a limit to increasing the diameter of the bolt 40. . In this case, there is a method of receiving the load by increasing the number of bolts 40. However, in this method, the work of forming screw holes for many bolts 40 and the work of screwing many bolts 40 increase.

  Since the basket 1a according to the second embodiment receives a load from the square pipe 20 by the load support key 41 having an outer diameter larger than that of the bolt 40, the area for receiving the load can be increased. Thus, even if the number of load support keys 41 is reduced, the load can be reliably received. And since the number of the volt | bolts 40 can be reduced, the operation | work which forms the screw hole with respect to the volt | bolt 40, and the operation | work which screws in many volt | bolts 40 can be reduced.

  FIGS. 15 and 16 are cross-sectional views showing other structures of the portion for attaching the connecting member to the plate-like member in the basket according to the second embodiment. 17 is a perspective view showing a plate-like member used in the structure shown in FIG. In the structure shown in FIG. 15, a bolt through hole 42 </ b> H through which a bolt 40 a passes is provided in a cylindrical load support key 42. A bolt through hole 31 is provided in one of the connecting members 30 attached to both side surfaces of one plate-like member 10, and a screw screw hole 33 is provided in the other. The bolt 40 a has a length that penetrates the plate-like member 10 from one connecting member 30 and reaches the other connecting member 30.

  The length of the bolt 40a is such that when the bolt 40a is tightened with a normal torque, the tip of the bolt 40a slightly protrudes from the surface of the first side surface 30A of the connecting member 30. The soundness of the bolt fastening operation can be confirmed simply by confirming the presence or absence and the presence or absence of protrusion of the tip of the bolt 40a from the surface of the first side surface 30A. For this reason, since the confirmation work of the bolt fastening work which is not easy in nature can be completed reliably and in a short time, the assembly work of the basket 1a can be completed in a short time.

  In attaching the connecting member 30 to the plate member 10, first, the load support key 42 is inserted into the key through hole 10 </ b> H <b> 2 formed in the plate member 10, and the load support key 42 and the plate member 10 are fitted. Let Then, the key receiving recess 32 of the connecting member 30 is fitted into the end portion of the load supporting key 42 protruding from the side surface of the plate-like member 10, and the connecting member 30 and the load supporting key 42 are fitted. Thereafter, the bolt 40 a is passed through the bolt through hole 31 provided in one connecting member 30 and then inserted into the bolt through hole 42 H of the load support key 42 and screwed into the bolt screw hole 33 provided in the other connecting member 30. The connecting member 30 is attached to the plate-like member 10 with the bolt 40a. In this structure, since it is not necessary to form screw holes at both ends of the load support key 42, processing for forming the corresponding screw holes can be reduced.

  The structure shown in FIG. 16 is the same as the structure shown in FIG. 15 except that a plate-like load support key 43 having a bolt through hole 43H through which the bolt 40a is passed is used. The load support key 43 does not penetrate the plate-like member 10 and is fitted into the key receiving recess 10H1 (see FIGS. 16 and 17) formed on the side surface 10S of the plate-like member 10, that is, on the connecting member 30 side. The member 10 is fitted. In this example, the load support key 43 has a disk shape, more specifically, a donut shape. However, if the load support key 43 has a shape that fits in the key receiving recess 32, the load support key 43 has a non-circular shape such as an elliptical plate shape. Also good. Further, the load support key 43 may be formed in a rectangular plate shape to ensure an area necessary for receiving a load.

  In attaching the connecting member 30 to the plate member 10, first, the load support key 43 is fitted into the key receiving recess 10 </ b> H <b> 1 formed in the plate member 10, and the load support key 43 and the plate member 10 are fitted. Then, the key receiving recess 32 of the connecting member 30 is fitted into the end portion of the load support key 43 protruding from the side surface of the plate member 10, and the connecting member 30 and the load support key 42 are fitted. Thereafter, the bolt 40 a is passed through the bolt through hole 31 provided in the one connecting member 30 and then inserted into the bolt through hole 43 H of the one load support key 43. Then, the bolt 40 a is inserted into the bolt through hole 43 H of the other load support key 43 after passing through the bolt through hole 10 H 4 provided in the plate-like member 10, and the bolt screw hole 33 provided in the other connecting member 30. Screw in. Thereby, the connecting member 30 is attached to the plate-like member 10 using the bolt 40a. In this structure, since the hole for penetrating the large-diameter load support key is not required in the plate-like member 10, it is possible to suppress a decrease in the heat transfer performance of the plate-like member 10.

  In addition, the key receiving recess 32 of the plate-like member 10 may be previously provided with a heat transfer enhancement layer made of a material having high thermal conductivity, for example, a metal paste such as silver paste or copper paste, or carbon paste. Furthermore, if the load supporting key 43 is held by using the adhesive force of the paste, an effect of facilitating the joining with the connecting member 30 can be obtained. Further, due to the joining with the connecting member 30, the excess paste is pushed from the mating surface of the key receiving recess 32 and the load support key 43 into the gap of the joint other than the mating surface, and the load support key 43 is assembled. Since the necessary gap is filled, the heat transfer performance of the plate member 10 can be improved.

  18 and 19 are cross-sectional views showing another structure of the portion for attaching the connecting member to the plate-like member in the basket according to the second embodiment. FIG. 20 is a front view illustrating another configuration example of a portion for attaching the connecting member to the plate-like member in the basket according to the second embodiment. In these structures, at least one of the keys 41, 43 and the connecting member 30 between the keys 41, 43 serving as load supporting means and the plate-like member 10 is rotated to suppress the rotation of the keys 41, 43. A fixed key 44 as a suppressing member is provided. The structure shown in FIG. 18 is obtained by providing the fixed key 44 in the structure shown in FIG. 13, and the structure shown in FIG. 19 is obtained by providing the fixed key 44 in the structure shown in FIG. As for the shape of the fixed key 44, rotation can be suppressed even in a circular shape in addition to the rectangular shape shown in FIG.

  As shown in FIGS. 18, 19, and 20, in the plate-like member 10, a notch provided in a part of the key through hole 10H2 or the key receiving recess 10H1 becomes a fixed key groove 10H3. Then, a rectangular columnar fixed key 44 is inserted into a space formed by the fixed key groove 10H3 and a cutout provided on the outer periphery of the load support key 41 or the load support key 43. For example, in FIG. The rotation of the support key 41 is suppressed. Alternatively, in FIG. 19, the load supporting key 43 is prevented from dropping during assembly. In the present embodiment, a fixed key 44 is provided between the plate-like member 10 and the load support key 41 or between the plate-like member 10 and the load support key 43, but the connection member 30 and the load support key 41 or the connection member are provided. A fixed key 44 may be provided between 30 and the load support key 43.

  Although the shape of the cross section orthogonal to the longitudinal direction of the load support key 41 and the load support key 43 may be non-circular and these rotation stoppers may be used, such processing requires a great deal of labor. For this reason, if the fixed key 44 is used as in the above-described structure, it is possible to provide a function of preventing rotation of the load support key 41 and the like and a function of preventing the load support key 41 from falling off during assembly by simple processing. When assembling the basket 1 a shown in FIG. 12, the basket 1 a can be easily assembled by attaching the fixed key 44 to the load support key 41 and the like and fixing them to the plate member 10 in advance. Note that the fixed key 44 is not limited to the one described above as long as it can suppress the rotation of the load support key 41 and the like.

  As described above, in the present embodiment, in addition to the configuration disclosed in the first embodiment described above, the load from the square pipe, that is, the connecting member is between the fastening means and the connecting member and between the fastening means and the plate-like member. A load supporting means for supporting a load in a direction orthogonal to the longitudinal direction of the head is provided. As a result, in addition to the operations and effects similar to those of the first embodiment described above, the load support means receives a load from the square pipe, but the load in the Y direction generates a larger load on the fastening means than the load in the X direction. Therefore, here, when the present embodiment is compared with the first embodiment using only the fastening means using bolts with respect to the load in the X direction, the area receiving the load in the X direction can be increased. Accordingly, the load can be reliably received even if the number of load supporting means (for example, bolts) is reduced. As a result, since the number of fastening means can be reduced, when a bolt is used as the fastening means, the work of forming a screw hole for the bolt and the work of screwing a large number of bolts can be reduced.

(Embodiment 3)
In the third embodiment, in addition to the configuration of the first embodiment, a groove is formed on the side surface of the plate-like member in a direction in which the plurality of plate-like members are stacked (a direction parallel to the cavity axis Z in FIG. 1). The difference is that the connecting member is fitted into this groove. Other configurations are the same as those of the first embodiment.

  FIG. 21 is a perspective view showing a basket according to the third embodiment. FIG. 22 is a cross-sectional view showing a portion for attaching the connecting member to the plate-like member in the basket according to the third embodiment. The plate-like member 10b constituting the basket 1b according to the present embodiment has a groove (hereinafter referred to as a connecting member attachment groove) 16 formed on the side surface 10Sb. The connecting member mounting groove 16 is formed in the direction in which the plurality of plate-like members 10b are stacked. Since the connecting member mounting groove 16 of the plate-like member 10b engages with the connecting member 30b in a wide range, the shear load generated in the connecting member mounting groove 16 due to the load in the X direction is greater than that of the first and second embodiments. Can be taken in a much wider range. Further, the shear load generated in the connecting member mounting groove 16 due to the load in the X direction can be received with a shallow groove depth that can be engaged. By these actions, the strength reduction of the plate-like member 10b can be minimized. Here, the connecting member 30b has the same configuration as the connecting member 30 shown in FIGS. 9-1 and 9-2.

  The connecting member 30 is attached to the connecting member attaching groove 16, and is fastened and attached to the plate-like member 10 b with a bolt 40. As shown in FIGS. 22 and 23, the connecting member 30b has a rectangular cross section perpendicular to the longitudinal direction. And the bolt through-hole 31 which the volt | bolt 40 penetrates is formed in the side facing the plate-shaped member 10b of the connection member 30b. The bolt through hole 31 has the same configuration as the bolt through hole 31 of the plate-like member 30 shown in FIGS. That is, the bolt through-hole 31 is a long hole and is subjected to spot facing. Accordingly, as shown in FIG. 22, when the bolt 40 is passed through the bolt through hole 31 and the connecting member 30b is fastened and attached to the plate-like member 10b, the head of the bolt 40 is hidden in the bolt through hole 31 and connected. It can be avoided that the head of the bolt 40 protrudes from the side surface 30A of the member 30b.

  Further, between the connecting member mounting groove 16 and the connecting member 30 fitted into the connecting member mounting groove 16, a material having a high thermal conductivity, for example, a metal paste such as silver paste or copper paste, carbon paste, or the like is used. A heat promoting layer may be provided. As a result, the heat transfer performance between the square pipe 20b and the plate-like member 10b is improved, so that the heat transfer performance of the entire basket can be further improved. For this reason, it is desirable to form such a heat transfer promoting layer.

  A screw hole 10H is formed in the connecting member mounting groove 16 formed in the side surface 10Sb of the plate-like member 10b. After the connecting member 30 is fitted into the connecting member mounting groove 16, the bolt 40 is passed through the bolt through hole 31 of the connecting member 30 and screwed into the screw hole 10H of the plate-like member 10b, so that the connecting member 30 is connected to the connecting member mounting groove. Fasten to 16 and attach. And the basket 1b is comprised by fitting the said recessed part of the square pipe 20b in which the recessed part fitted with the connection member 10b was formed in both the long side side edge parts to the connection member 30 arrange | positioned facing. .

  In this basket 1b, the connecting member 30 is fitted into the connecting member mounting groove 16 formed on the side surface 10Sb of the plate-like member 10b, and the load from the square pipe 20b, that is, the load in the direction orthogonal to the longitudinal direction of the connecting member 30 is applied. It is received by the connecting member 30 and the connecting member mounting groove 16. As a result, the area that receives the load can be increased, so that the load hardly acts on the bolt 40. Thereby, since the thing with a small diameter can be used for the volt | bolt 40 or the number of the volt | bolts 40 can be reduced, the operation | work which forms the screw hole with respect to the volt | bolt 40, and the operation | work which screws in many volt | bolts 40 can be reduced. Moreover, since the thing of a small diameter can be used for the volt | bolt 40 and the number of the volt | bolts 40 can be reduced, the manufacturing cost of the basket 1b can be suppressed.

  FIG. 23 is a cross-sectional view showing another structure of the portion for attaching the connecting member to the plate-like member in the basket according to the third embodiment. In this structure, a bolt through hole 10H4 through which the bolt 40a passes is provided in the plate-like member 20b. A bolt through hole 31 is provided in one of the connecting members 30 attached to both side surfaces of one plate-like member 10b, and a screw screw hole 35 is provided in the other. The bolt 40 a has a length that penetrates the plate-like member 10 b from one connecting member 30 and reaches the other connecting member 30.

  In attaching the connecting member 30 to the plate-like member 10b, first, the connecting member 30 is fitted into the connecting member attaching groove 16, and the connecting member 30 and the plate-like member 10b are fitted. Then, the bolt 40 a is inserted into the bolt through hole 10 H 4 of the plate-like member 10 b after passing through the bolt through hole 31 provided in the one connecting member 30, and screwed into the bolt screw hole 35 provided in the other connecting member 30. The connecting member 30 is attached to the plate-like member 10b with the bolt 40a. In this structure, since it is not necessary to form screw holes on both side surfaces of the plate-like member 10b, processing for forming the corresponding screw holes can be reduced.

  As described above, in the present embodiment, in addition to the configuration disclosed in the first embodiment described above, a connecting member mounting groove is formed on the side surface of the plate-like member in a direction in which a plurality of plate-like members are stacked, and the connecting member is connected to the connecting member. Fit in the mounting groove. And a square pipe is arrange | positioned while arrange | positioning the plate-shaped member coupling body comprised by laminating | stacking a several plate-shaped member facing. Accordingly, in addition to the operations and effects similar to those of the first embodiment described above, a load in the X direction from the square pipe is received by the connecting member and the connecting member mounting groove. The load hardly acts. Accordingly, the load in the X direction can be reliably received even if the number of load supporting means is reduced. As a result, since the number of fastening means can be reduced, when a bolt is used as the fastening means, a bolt having a small diameter can be used, and an operation for forming a screw hole for the bolt or a large number of bolts can be used. Since the screwing work can be reduced, the manufacturing cost of the basket can be reduced.

(Embodiment 4)
The fourth embodiment is the same as the first to third embodiments except that a notch is formed at a corner portion outside the square pipe and meshed with the connecting member. Other configurations are the same as those in the first to third embodiments.

  FIG. 24-1 is a plan view illustrating a basket according to the fourth embodiment. FIG. 24-2 is a plan view showing a square pipe constituting the basket according to the fourth embodiment. FIG. 25A to FIG. 25C are explanatory views showing a connecting member constituting the basket according to the fourth embodiment. The square pipe 20c constituting the basket 1c has cutout portions 21 formed at four outer corner portions. The notch 21 is a groove formed over the longitudinal direction of the square pipe 20c. In this embodiment, the notch part 21 is formed over the whole longitudinal direction of the square pipe 20c. The groove (notch portion 21) may be provided at a position where the outer corner of the square pipe 20c leaves a plane parallel to the inner wall surface of the square pipe 20c. The shape of the groove is shown in FIGS. 24-1 and 24. It is not limited to the shape illustrated in -2, and any shape may be used as long as the displacement between the square pipe 20c constituting the basket 1c and the plate-like member connection body connecting the plate-like members 10 is suppressed.

  As for the connection member 30c which connects the plate-shaped member 10, the shape of the cross section orthogonal to the longitudinal direction is trapezoid shape. And as for the connection member 30c, the upper bottom side (short side side) in the said cross section is attached to the side surface of the plate-shaped member 10. FIG. The connecting member 30c is attached to the plate member 10 by the structure described in the first to third embodiments. The upper bottom side surface and the lower bottom side (long side side) surface of the connecting member 30c in the cross section face each other and are arranged in parallel. Further, the upper bottom surface and the lower bottom surface of the connecting member 30c in the cross section are connected by an inclined surface to form a convex portion 36. When the connecting member 30c is attached to the side surface of the plate-like member 10, the convex portion 36 of the connecting member 30c is longer than the portion attached to the side surface of the plate-like member 10 of the connecting member 30c with respect to the longitudinal direction of the connecting member 30c. Projects in the direction perpendicular to each other. Thus, the convex part 36 becomes an overhang | projection part of the connection member 30c.

  The basket 1c arrange | positions the plate-shaped member coupling body comprised by laminating | stacking the plate-shaped member 10 in multiple steps, and connected with the connection member 30c, and arrange | positions the square pipe 20c between plate-shaped member coupling bodies. A space formed between adjacent square pipes 20c becomes a flux trap FL for decelerating fast neutrons from the recycled fuel assembly. This space is formed by being surrounded by the opposing square pipe 20c and the opposing connecting member 30c.

  In arranging the square pipe 20c between the plate-like member coupling bodies, the notch 21 of the square pipe 20c is inserted into the projection 36 of the coupling member 30c, and the notch 21 of the square pipe 20c and the projection of the coupling member 30c are inserted. The portion 36 (overhang portion) is engaged. As a result, the displacement between the square pipe 20c and the plate-like member coupling body is suppressed, so that the basket 1c can be easily assembled. Further, even when an impact load is applied to the basket 1c, the displacement between the square pipe 20c and the plate-like member coupling body is suppressed, so that the soundness of the basket 1c is ensured.

  As illustrated in FIG. 25A, the plate-like member 10 is formed with the connecting member mounting groove 16 as in the basket 1b according to the third embodiment described above (see FIG. 21), and the connecting member 30c1 is connected to the connecting member mounting groove. 16 may be inserted. Further, as shown in FIG. 25-2, a plate is formed in the plate-like member 10 to form a connecting member mounting groove 16a that is processed into a groove shape, and is engaged with the connecting member mounting groove 16a and the cutout portion of the square pipe 20c. The shaped member 10 and the square pipe 20c may be connected. In this way, the load from the square pipe 20b, that is, the load in the direction orthogonal to the longitudinal direction of the connecting members 30c1 and 30c2, is received by the connecting members 30c1 and 30c2 and the connecting member mounting grooves 16 and 16a. The area to receive can be increased. As a result, the load acting on the bolt for attaching the connecting members 30c1 and 30c2 to the plate member 10 can be reduced.

  Further, as shown in FIG. 25-3, the connecting member mounting groove 16 is formed in the plate-like member 10 as in the basket 1b according to the third embodiment described above (see FIG. 21), and the connecting member 30c3 is connected to the connecting member 30c3. It may be fitted into the mounting groove 16. And you may mesh the notch part 20e of the square pipe 20e, and the convex part 36c (overhang | projection part) of the connection member 30c. Here, the convex portion 36c of the connecting member 30c is configured to mesh with a notch portion having a rectangular cross section.

  Between the connecting member mounting grooves 16 and 16a and the connecting members 30c1 and 30c2, a heat transfer promoting layer made of a material having high thermal conductivity, for example, a metal paste such as silver paste or copper paste, a carbon paste, or the like may be provided. Good. Thereby, the heat transfer performance between the connecting members 30c1 and 30c2 and the plate-like member 10c is improved, so that the heat transfer performance of the entire basket 1c can be further improved. Further, the heat transfer promoting layer such as a metal paste such as silver paste or copper paste or carbon paste eliminates the possibility of material loss due to galling that occurs when the connecting members 30c1 and 30c2 are attached to the plate-like member 10c. be able to. Therefore, it is desirable to form a heat transfer promoting layer.

  As described above, in the present embodiment, in addition to the configurations disclosed in the above-described first to third embodiments, a notch portion is formed in a corner portion on the outer side of the square pipe and meshed with the connecting member. Accordingly, in addition to the operations and effects similar to those of the first to third embodiments described above, the displacement between the square pipe and the plate-like member coupling body is suppressed, so that an effect of facilitating the assembly of the basket can be obtained. In addition, even when an impact load is applied to the basket, the displacement between the square pipe and the plate-like member coupling body is suppressed, so that an effect of ensuring the soundness of the basket can be obtained.

(Embodiment 5)
In the fifth embodiment, the outer shape of the cross section orthogonal to the longitudinal direction is a first square pipe having a quadrangle having four right angle corners, and a second square pipe having protrusions on opposing side walls. And the bolt through hole provided in the square pipe and the screw portion provided in the plate-like member are fastened by a fastening member (for example, a bolt).

  FIG. 26 is a plan view showing a basket according to the fifth embodiment. The basket 1d is formed by opposingly arranging the plate-like member assemblies in which the plate-like members 10 are sequentially coupled and stacked while the first square pipe 20 and the second square pipe 20d are arranged in a row. Composed. The first square pipe 20 and the second square pipe 20d are provided with through holes (bolt holes) 23 corresponding to the positions of the screw holes 10Hd provided in the plate-like member 10, and the heads of the bolts 40d are formed in the cell space. Bolt through holes similar to those of the first embodiment are provided so as not to protrude.

  In the fifth embodiment, the position of the bolt through hole 23 is not limited to the position that becomes the flux trap FL between the first square pipe 20 and the second square pipe 20d, and can be arranged in the cell. However, this is a significant difference from the other embodiments. The depth of the bolt through hole 23 is the same as that of the other embodiments, and when the bolt 40d is tightened with a normal torque, the head of the bolt 40d is attached to the first square pipe 20 or the second square pipe 20. By setting the depth to be invisible from the inner surface of the square pipe 20d, the presence / absence of the bolt 40d and the soundness of the work for fastening the bolt 40d can be confirmed. Therefore, since the confirmation work for fastening the bolt 40d, which is not easy in nature, can be completed reliably and in a short time, the assembly work of the basket 1d can be completed in a short time.

  The outer shape of the cross section orthogonal to the longitudinal direction of the first square pipe 20 is a quadrangle having four right angle corners, for example, a rectangle or a square. The inner shape of the cross section is a square. The second square pipe 20d has a square inner shape in a cross section perpendicular to the longitudinal direction. As shown in FIG. 26, the first square pipe 20 and the second square pipe 20d are arranged in a row so that the same kind of square pipes are not adjacent to each other, and the plate-like member coupling body arranged opposite to each other. It is arranged between. Each of the first square pipe 20 and the second square pipe 20d includes through holes 20I and 20Id penetrating in the longitudinal direction, and the through holes 20I and 20Id serve as cells for storing the recycled fuel assemblies. . In this way, cell rows of cells that store the recycled fuel assemblies are formed in the direction in which the first square pipe 20 and the second square pipe 20d are arranged in a row.

  The second square pipe 20d includes a protruding portion 22 that protrudes from each side surface 20Sd orthogonal to the side surface in contact with the plate-like member 10 in a direction parallel to the side surface in contact with the plate-like member 10. That is, the protrusion 22 protrudes in the arrangement direction of the first square pipe 20 and the second square pipe 20d arranged in a row. The protrusion 22 provided on the second square pipe 20d is formed over the entire lengthwise direction of the second square pipe 20d. Further, the end portion 22t of the protruding portion is formed in parallel with the side surface 20Sd orthogonal to the side surface in contact with the plate member 10, and abuts on the side surface 20S of the first square pipe 20. A space surrounded by the side surface 20S of the first square pipe 20, the side surface 20Sd of the second square pipe, and the two protrusions 22 is a flux trap FL for decelerating fast neutrons from the recycled fuel assembly. It becomes.

  As mentioned above, in this embodiment, since a basket is comprised combining a plate-shaped member, a 1st square pipe, and the 2nd square pipe 2, the plate-shaped member and 1st which comprise a basket by extrusion molding, for example. After the square pipe and the second square pipe are manufactured, the basket can be assembled by subjecting them to simple processing such as drilling. As a result, cutting of members constituting the basket can be greatly reduced. As a result, even when the members constituting the basket are made of a difficult-to-cut material such as boron-aluminum, the basket can be manufactured relatively easily, and waste of materials due to cutting can be suppressed. Thereby, the processing cost can be reduced.

(Embodiment 6)
In the sixth embodiment, the outer shape of the cross section orthogonal to the longitudinal direction is a first square pipe that is a quadrangle having four right-angled corners, and a second square pipe having protrusions on opposing side walls. Is characterized in that they are arranged in a row and arranged between the plate-like member assemblies arranged opposite to each other.

  FIG. 27 is a plan view showing a basket according to the sixth embodiment. The basket 1e is configured by arranging the first square pipes 20 and the second square pipes 20d in a single row while the plate-like member coupling bodies constituted by stacking the plate-like members 10 are arranged to face each other. Is done. The plate-like member 10 is formed with a through-hole 17 that penetrates in the stacking direction, and is fastened with a nut 19 through a fastening bolt 18 to the through-hole 17 of the stacked plate-like member 10 to constitute a plate-like member coupling body. To do.

  The outer shape of the cross section orthogonal to the longitudinal direction of the first square pipe 20 is a quadrangle having four right angle corners, for example, a rectangle or a square. The inner shape of the cross section is a square. The second square pipe 20d has a square inner shape in a cross section perpendicular to the longitudinal direction. As shown in FIG. 27, the first square pipe 20 and the second square pipe 20d are arranged in a row so that the same kind of square pipes are not adjacent to each other, and the plate-like member coupling body arranged opposite to each other. It is arranged between. Each of the first square pipe 20 and the second square pipe 20d includes through holes 20I and 20Id penetrating in the longitudinal direction, and the through holes 20I and 20Id serve as cells for storing the recycled fuel assemblies. . In this way, cell rows of cells that store the recycled fuel assemblies are formed in the direction in which the first square pipe 20 and the second square pipe 20d are arranged in a row.

  The second square pipe 20d includes a protruding portion 22 that protrudes from each side surface 20Sd orthogonal to the side surface in contact with the plate-like member 10 in a direction parallel to the side surface in contact with the plate-like member 10. That is, the protrusion 22 protrudes in the arrangement direction of the first square pipe 20 and the second square pipe 20d arranged in a row. The protrusion 22 provided on the second square pipe 20d is formed over the entire lengthwise direction of the second square pipe 20d. Further, the end portion 22t of the protruding portion is formed in parallel with the side surface 20Sd orthogonal to the side surface in contact with the plate member 10, and abuts on the side surface 20S of the first square pipe 20. A space surrounded by the side surface 20S of the first square pipe 20, the side surface 20Sd of the second square pipe, and the two protrusions 22 is a flux trap FL for decelerating fast neutrons from the recycled fuel assembly. It becomes.

  As mentioned above, in this embodiment, since a basket is comprised combining a plate-shaped member, a 1st square pipe, and the 2nd square pipe 2, the plate-shaped member and 1st which comprise a basket by extrusion molding, for example. After the square pipe and the second square pipe are manufactured, the basket can be assembled by subjecting them to simple processing such as drilling. As a result, cutting of members constituting the basket can be greatly reduced. As a result, even when the members constituting the basket are made of a difficult-to-cut material such as boron-aluminum, the basket can be manufactured relatively easily, and waste of materials due to cutting can be suppressed. Thereby, the processing cost can be reduced.

  As described above, the manufacturing method of the recycled fuel assembly storage basket and the recycled fuel assembly storage container, and the recycled fuel assembly storage basket according to the present invention are useful for transporting and storing the recycled fuel assembly, In particular, it is suitable for reducing the cutting work of the members constituting the recycled fuel assembly storage basket.

It is sectional drawing which shows the outline | summary of the cask which is an example of a recycle fuel assembly storage container. It is AA sectional drawing of the cask shown in FIG. 1 is a perspective view showing a basket according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing a portion for attaching a connecting member to a plate-like member in the basket according to the first embodiment. FIG. 3 is a partially enlarged view showing the basket according to the first embodiment. FIG. 3 is a side view of a plate member that constitutes the basket according to the first embodiment. FIG. 3 is a side view of a plate member that constitutes the basket according to the first embodiment. It is a front view which shows the modification of the plate-shaped member which comprises the basket which concerns on Embodiment 1. FIG. It is a front view which shows the modification of the plate-shaped member which comprises the basket which concerns on Embodiment 1. FIG. It is a front view which shows the modification of the plate-shaped member which comprises the basket which concerns on Embodiment 1. FIG. It is a front view which shows the modification of the plate-shaped member which comprises the basket which concerns on Embodiment 1. FIG. It is a side view of the square pipe which comprises the basket which concerns on Embodiment 1. FIG. It is a front view of the square pipe which comprises the basket which concerns on Embodiment 1. FIG. FIG. 3 is a perspective view of a connecting member constituting the basket according to the first embodiment. 3 is a cross-sectional view of a connecting member that constitutes the basket according to Embodiment 1. FIG. It is explanatory drawing which shows the plate-shaped member coupling body which piled up the plate-shaped member and connected with the connection member. It is explanatory drawing which shows the plate-shaped member coupling body which piled up the plate-shaped member and connected with the connection member. It is explanatory drawing which shows the plate-shaped member coupling body which piled up the plate-shaped member and connected with the connection member. It is explanatory drawing which shows the other structural example of a plate-shaped member coupling body. 3 is a plan view of the basket according to Embodiment 1. FIG. 3 is a plan view of the basket according to Embodiment 1. FIG. It is explanatory drawing which shows the modification of the attachment structure of a connection member and a plate-shaped member. 6 is a perspective view showing a basket according to Embodiment 2. FIG. FIG. 10 is a cross-sectional view showing a portion for attaching a connecting member to a plate-like member in the basket according to the second embodiment. 6 is a perspective view showing a connecting member that constitutes a basket according to Embodiment 2. FIG. It is sectional drawing which shows the other structure of the part which attaches a connection member to a plate-shaped member in the basket which concerns on Embodiment 2. It is sectional drawing which shows the other structure of the part which attaches a connection member to a plate-shaped member in the basket which concerns on Embodiment 2. It is a perspective view which shows the plate-shaped member used with the structure shown in FIG. It is sectional drawing which shows the other structure of the part which attaches a connection member to a plate-shaped member in the basket which concerns on Embodiment 2. It is sectional drawing which shows the other structure of the part which attaches a connection member to a plate-shaped member in the basket which concerns on Embodiment 2. FIG. 10 is a front view showing another configuration example of a portion for attaching a connecting member to a plate-like member in the basket according to the second embodiment. 6 is a perspective view showing a basket according to Embodiment 3. FIG. It is sectional drawing which shows the part which attaches a connection member to a plate-shaped member in the basket which concerns on Embodiment 3. It is sectional drawing which shows the other structure of the part which attaches a connection member to a plate-shaped member in the basket which concerns on Embodiment 3. FIG. 6 is a plan view showing a basket according to a fourth embodiment. It is a top view which shows the square pipe which comprises the basket which concerns on Embodiment 4. It is explanatory drawing which shows the connection member which comprises the basket which concerns on Embodiment 4. It is explanatory drawing which shows the connection member which comprises the basket which concerns on Embodiment 4. It is explanatory drawing which shows the connection member which comprises the basket which concerns on Embodiment 4. FIG. 10 is a plan view showing a basket according to a fifth embodiment. FIG. 10 is a plan view showing a basket according to a sixth embodiment.

Explanation of symbols

1, 1a, 1b, 1c basket (recycled fuel assembly storage basket)
10, 10b, 10c Plate-like member 10H, 10Hd Screw hole 10H1 Key receiving recess 10H2 Key receiving hole 10H3 Fixed keyway 10H4 Bolt through hole 10LT1, 10LT2 Long side end 10S, 10Sb Side surface 10ST Short side end 11 Projection 12 Groove portion 13 Through hole 15 Leg portion 16, 16a, 16c Connecting member mounting groove 20, 20c Square pipe 20I, 20Id Through hole 21 Notch portion 30, 30c Connecting member 30A First side surface 30B Second side surface 31 Bolt through hole 32 Key Receiving recess 33, 35 Bolt screw hole 40, 40a, 40d Bolt 41, 42, 43 Load support key 41H Through hole 42 Key hole 42H, 43H Through hole 44 Fixed key 50 Reinforcement member 50H Screw hole 100, 100a Plate member connection Body 200 cask 201 trunk body 201 Cavity

Claims (13)

A plurality of plate-like members that are stacked in contact with each other on the long side ends;
A side surface of a plate-like member coupling body that extends in the direction in which the plate-like members are stacked and is arranged in a direction perpendicular to the direction in which the plate-like members are stacked and is stacked. A plurality of connecting members that connect the plurality of plate-like members and project from the side surface;
A cylindrical structure having a through-hole that penetrates in the longitudinal direction and stores the recycled fuel, and is disposed between the side surfaces of the plate-like member coupling body facing each other, and is associated with the coupling member. A matching square pipe,
A recycle fuel assembly storage basket comprising:   The recycled fuel assembly storage basket according to claim 1, wherein the plate-like member includes a through-hole penetrating in a longitudinal direction thereof.   The recycle fuel assembly according to claim 1 or 2, wherein the connecting member has a rectangular cross section perpendicular to the longitudinal direction, and one long side in the cross section is in contact with a side surface of the plate member. Body storage basket.   The recycled fuel assembly storage basket according to any one of claims 1 to 3, wherein the connecting member is divided at different positions in a direction in which the plate-like members are stacked.   The recycling fuel assembly storage basket according to any one of claims 1 to 4, wherein the connecting member is attached to the plate member by fastening means.   6. The recycled fuel assembly according to claim 5, wherein a long hole penetrating in a side portion of a long side of the cross-section perpendicular to the longitudinal direction of the connecting member is provided, and the fastening means penetrates the long hole. Body storage basket.   The load supporting means for supporting the load from the square pipe is interposed between the fastening means and the connecting member and between the fastening means and the plate-like member. Recycled fuel assembly storage basket described in 1.   At least one of the load support means and the plate-like member and between the load support means and the connecting member is provided with a rotation suppression member that suppresses the rotation of the load support means. The recycled fuel assembly storage basket according to claim 7.   A reinforcing member made of a material having higher rigidity than the plate-like member is disposed inside the through-hole of the plate-like member, and the reinforcing member and the fastening means are coupled to each other. Item 9. The recycled fuel assembly storage basket according to any one of Items 5 to 8. On the side surface of the plate member, a groove is formed in the direction in which the plurality of plate members are stacked,
The recycled fuel assembly storage basket according to claim 1, wherein the connecting member is fitted in the groove. A cutout portion is formed in the corner portion on the outside of the square pipe in the longitudinal direction of the square pipe, and the connection member has a cross-section formed in a trapezoidal shape perpendicular to the longitudinal direction, and The upper bottom side surface in the cross section is attached to the side surface of the plate-like member coupling body,
The recycled fuel assembly storage basket according to any one of claims 1 to 10, wherein the cutout portion of the square pipe is engaged with the connection member. A torso comprising an opening and a cavity;
A lid attached to the opening to seal the cavity;
The recycled fuel assembly storage basket according to any one of claims 1 to 11, which is disposed in the cavity.
A recycled fuel assembly storage container, comprising: A procedure of stacking a plurality of plate-like members by bringing their long side end portions into contact with each other;
A plurality of plate-like members are connected to a side surface of the plate-like member and connected by a connecting member protruding from the side surface, and a plurality of plate-like member connecting bodies are configured,
A procedure in which the side surfaces of the plurality of plate-like member coupling bodies face each other and the coupling members face each other, and
A procedure for disposing the square pipe between the plate-like member couplings facing each other;
The manufacturing method of the basket for recycling fuel assembly storage characterized by including these.

Images