Radioactive material storage container

Abstract

This prevents corrosion at the end of the body on the opening side. [Solution] The radioactive material storage container comprises a body having an opening on one axial side and capable of storing radioactive material inside, and a closing part that is detachably attached to the opening and capable of closing the opening. The closing part has a lid that is attached in common during storage and transport of the radioactive material, and an adapter that is attached to the axial end of the body during storage in place of the lid which has a sealing function and is attached during transport. The adapter has a corrosion-inhibiting part that suppresses corrosion of the body in at least a part of the portion that comes into contact with the body.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a radioactive material storage container.

BACKGROUND ART

[0002] In nuclear facilities, radioactive waste such as spent fuel generated in nuclear reactors and the like is stored in radioactive material storage containers (casks), transported to storage facilities, reprocessing facilities and the like, and stored or reprocessed. The radioactive material storage container is composed of a cylindrical body portion with a bottom and an open top, and a closing portion fixed to the upper part of the body portion to close the opening. As a closing portion of such a radioactive material storage container, for example, a configuration is known that includes a lid commonly mounted during storage and transport of radioactive materials, and an adapter that is mounted on the axial end of the body portion during storage in place of the lid having a sealing function that is mounted during transport (see, for example, Patent Document 1).

PRIOR ART DOCUMENTS

PATENT DOCUMENTS

[0003]

PATENT DOCUMENT 1

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] In the radioactive material storage container as described above, when a lid is attached as the closing portion, it has a sealing function so that intrusion of water that causes corrosion does not occur, and corrosion is not a problem. On the other hand, when an adapter is attached as the closing portion, since it does not have a sealing function, water intrusion occurs, which may cause corrosion and the like. For example, when corrosion occurs on the body portion side while the adapter is attached, if a lid is attached in place of the adapter to the corroded portion, the sealing function may be affected. For this reason, it is required to appropriately protect the end portion on the opening side of the body portion from corrosion.

[0005] This disclosure has been made in view of the above, and aims to provide a radioactive material storage container that can prevent corrosion of the end portion on the opening side of the body. [Means for solving the problem]

[0006] The radioactive material storage container according to this disclosure comprises a body portion having an opening on one axial side and capable of storing radioactive material inside, and a closing portion that is detachably attached to the opening and capable of closing the opening, wherein the closing portion has a lid that is attached in common during storage and transport of the radioactive material, and an adapter that is attached to the axial end of the body portion during storage in place of the lid which has a sealing function and is attached during transport, wherein the adapter has a corrosion suppression portion that suppresses corrosion of the body portion in at least a part of the portion that comes into contact with the body portion. [Effects of the Invention]

[0007] According to this disclosure, corrosion of the end portion of the body on the opening side can be prevented. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing an example of a radioactive material storage container according to an embodiment. [Figure 2] Figure 2 is a cross-sectional view showing an example of a part of the configuration of a radioactive material storage container according to the embodiment. [Figure 3] Figure 3 is a cross-sectional view showing another example of a partial configuration of a radioactive material storage container according to the embodiment. [Figure 4] Figure 4 is a cross-sectional view showing another example of a partial configuration of a radioactive material storage container according to the embodiment. [Figure 5] Figure 5 is a cross-sectional view showing another example of a partial configuration of a radioactive material storage container according to the embodiment. [Figure 6] Figure 6 is a cross-sectional view showing another example of a partial configuration of a radioactive material storage container according to the embodiment. [Figure 7]Figure 7 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to the embodiment. [Figure 8] Figure 8 is a cross-sectional view showing another example of a partial configuration of a radioactive material storage container according to the embodiment. [Figure 9] Figure 9 is a cross-sectional view showing another example of a partial configuration of a radioactive material storage container according to the embodiment. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the radioactive material storage container according to this disclosure will be described with reference to the drawings. However, this embodiment does not limit the present invention. Furthermore, the components in the following embodiments include those that are easily substituted or substantially identical to those that are easily substituted by those skilled in the art.

[0010] Figure 1 is a perspective view showing an example of a radioactive material storage container according to this embodiment. In Figure 1, a portion of the radioactive material storage container is shown broken. Also, in Figure 1, the break points are shown to be different for the primary lid 31 and secondary lid 32 of the closing part 13 and the adapter 33. As shown in Figure 1, the cask 11 as a radioactive material storage container comprises a cask body 12 and a closing part 13. The cask 11 contains radioactive waste such as spent fuel generated in a nuclear reactor or the like. The cask 11 is transported to a storage facility or a reprocessing facility. For example, in a storage facility, the cask 11 is stored in a so-called horizontal position (a state in which the axial direction, described later, is aligned horizontally).

[0011] The cask body 12 has a shell 21. The shell 21 is cylindrical (in this embodiment, cylindrical in shape). The shell 21 has an opening 22 at one end (upper end in Figure 1) in the axial direction of the cylindrical shell (axis direction of the central axis AX in Figure 1), and the other end (lower end in Figure 1) is closed. The shell 21 has a cavity 23 inside. A basket 24 is provided in the cavity 23. The basket 24 is provided with a plurality of cells 25 capable of independently storing radioactive material (e.g., spent fuel assemblies). The shell 21 is a forged product of carbon steel having a gamma-ray shielding function, but stainless steel may be used instead of carbon steel, or it may be a casting of spheroidal graphite cast iron or carbon steel casting.

[0012] The body portion 21 further comprises an outer cylinder 26, heat transfer fins 27, and resin (neutron shielding material) 28. The outer cylinder 26 is disposed on the outer circumferential surface of the body portion 21 with a predetermined gap between them. Multiple heat transfer fins 27 are provided circumferentially between the outer circumferential surface of the body portion 21 and the inner circumferential surface of the outer cylinder 26. The heat transfer fins 27 are made of copper and conduct heat between the outer circumferential surface of the body portion 21 and the inner circumferential surface of the outer cylinder 26. The resin 28 is provided in the space enclosed by the body portion 21, the outer cylinder 26, and the heat transfer fins 27. The resin 28 is a polymer material containing a large amount of hydrogen and contains boron or a boron compound having a neutron shielding function.

[0013] The body portion 21 further has a bottom portion 29. The bottom portion 29 is provided so as to protrude axially outward from the other closed end of the body portion 21 (below the lower end in Figure 1). The bottom portion 29 has a space enclosed by the other closed end of the body portion 21, and resin (neutron shielding material) is provided in the space.

[0014] The cask body 12 is equipped with a trunnion 30 on the body 21 for lifting the cask 11. The trunnion 30 is installed from the body 21 through the outer cylinder 26 and protrudes to the outermost circumference of the cask 11.

[0015] The closing part 13 is provided at the opening 22 of the barrel part 21, and closes the opening 22 to hermetically seal the barrel part 21 (the cask main body 12). The closing part 13 is configured to include a primary lid 31, a secondary lid 32, and an adapter 33. The primary lid 31 and the secondary lid 32 are mounted in common during both storage and transportation of radioactive materials. The primary lid 31 is formed in a disc shape using carbon steel or stainless steel that shields gamma rays as a material. Similarly to the primary lid 31, the secondary lid 32 is formed in a disc shape using carbon steel or stainless steel that shields gamma rays as a material. A resin (neutron shield) 28 may be provided between the primary lid 31 and the secondary lid 32. The adapter 33 is disposed so as to cover the secondary lid 32 and the end edge 22c of the barrel part 21. The adapter 33 is attached to the axial end of the barrel part 21 during storage, in place of a lid having a sealing function (for example, a tertiary lid, not shown) that is attached during transportation.

[0016] The primary lid 31 is fixed to the first stepped portion 22a formed in the opening 22 of the barrel part 21 by bolts (not shown) made of carbon steel or stainless steel, and is attached to the barrel part 21. The secondary lid 32 is fixed to the second stepped portion 22b formed in the opening 22 of the barrel part 21 by bolts (not shown) made of carbon steel or stainless steel, and is attached to the barrel part 21. Although not shown, metal gaskets are provided between the primary lid 31 and the first stepped portion 22a and between the secondary lid 32 and the second stepped portion 22b. The metal gaskets ensure sealing performance between the primary lid 31 and the first stepped portion 22a and between the secondary lid 32 and the second stepped portion 22b.

[0017] In the cask main body 12, a cylindrical end edge 22c that surrounds the secondary lid 32 and appears on the outside of the cask 11 is formed at the opening 22 of the barrel part 21. The end edge 22c has a surface (the upper surface in FIG. 1) located at a position on the outer side of the barrel part 21 (a higher position in FIG. 1) relative to the surface of the secondary lid 32, and surrounds the periphery of the secondary lid 32. The end edge 22c is provided with a plurality of bolt holes 34 for mounting the adapter 33 (or the tertiary lid) and a transportation buffer on its surface at intervals in the circumferential direction.

[0018] Figure 2 is a cross-sectional view showing an example of a partial configuration of the radioactive material storage container according to the present embodiment. Figure 2 is a diagram showing the configuration of a part of the broken section in Figure 1 (the part enclosed by the one-dot chain line). In Figure 2, the end edge 22c of the body portion 21 and a part of the adapter 33 are shown in an enlarged manner. As shown in Figure 2, the adapter 33 has a first end surface 33a, a second end surface 33b, a third end surface 33c, a first side surface 33d, and a second side surface 33e. Further, the adapter 33 has a bolt hole 33h penetrating the second end surface 33b and the third end surface 33c. The bolt hole 33h is provided so as to communicate with the bolt hole 34 in the end edge 22c.

[0019] The first end surface 33a is arranged to face the secondary lid 32. The second end surface 33b is connected to the first end surface 33a via the first side surface 33d. The second end surface 33b is arranged to face the end edge 22c. The first side surface 33d connects the outer peripheral portion of the first end surface 33a and the inner peripheral portion of the second end surface 33b along the axial direction. The first side surface 33d is arranged to face the inner peripheral surface 22d of the body portion 21. The second side surface 33e is disposed at the radially outer end portion of the adapter 33. The outer shape of the second side surface 33e can be made larger than, for example, the outer shape of the outer peripheral surface 22e of the body portion 21.

[0020] The adapter 33 has a corrosion inhibition portion 50 that inhibits corrosion of the body portion 21 at a portion in contact with the body portion 21, that is, a portion facing the body portion 21. In the present embodiment, the adapter 33 has welded portions 35 on the first side surface 33d and the second end surface 33b, which are the portions facing the body portion 21. The welded portion 35 is formed using a welding material containing the same metal material as the end edge 22c of the body portion 21. In the present embodiment, the end edge 22c of the body portion 21 uses, for example, carbon steel as a base material, and a stainless steel clad is formed on the surface. Therefore, the welded portion 35 can be configured such that, for example, carbon steel is used as the base material, and a stainless steel clad is formed on the surface. The welded portion 35 is formed over the entire surfaces of the first side surface 33d and the second end surface 33b.

[0021] In the example shown in Figure 2, the adapter 33 has a corrosion-inhibiting portion 50 in at least a portion of the part that contacts the body portion 21 to suppress corrosion of the body portion 21, and the corrosion-inhibiting portion 50 includes a welded portion 35 formed using welding material that includes the same metal material as the body portion 21. With this configuration, the adapter 33 is positioned so that the welded portion 35 is in contact with the edge 22c and inner circumferential surface 22d of the body portion 21. Therefore, the contact portion between the adapter 33 and the body portion 21 is made of the same type of metal. Thus, contact between dissimilar metals between the adapter 33 and the body portion 21 can be avoided, and corrosion on the edge 22c and inner circumferential surface 22d of the body portion 21 can be prevented.

[0022] Figure 3 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. The cask 11A shown in Figure 3 differs from the adapter 33 described above in the configuration of the adapter 33A. The differences will be described in detail below. As shown in Figure 3, the adapter 33A is provided with a painted portion 36 instead of a welded portion 35 as a corrosion suppression portion 50. Examples of materials that make up the painted portion 36 include epoxy resin, fluororesin, and silicone resin. The painted portion 36 is formed over the entire surface of the first side surface 33d and the second end surface 33b. When the adapter 33A is in place, the painted portion 36 is in close contact with the body portion 21.

[0023] In the example shown in Figure 3, the adapter 33A has a corrosion-inhibiting portion 50 on at least a part of the portion that covers the body portion 21, and the corrosion-inhibiting portion 50 includes a painted portion 36 that covers the first side surface 33d and the second end surface 33b, which are the surfaces of the adapter 33A. With this configuration, since the adapter 33A is positioned with the painted portion 36 in contact with the edge 22c and inner circumferential surface 22d of the body portion 21, contact between dissimilar metals at the contact portion between the adapter 33A and the body portion 21 can be avoided, and thus corrosion on the edge 22c and inner circumferential surface 22d of the body portion 21 can be prevented.

[0024] Figure 4 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. The cask 11B shown in Figure 4 differs from the adapter 33 etc. in the configuration of the adapter 33B. The differences will be described in detail below. As shown in Figure 4, the adapter 33B is provided with a groove 37 as a corrosion suppression part 50 instead of a welded part 35. The groove 37 is formed on the second end face 33b in the radially inner part of the body 21 from the bolt hole 33h. The groove 37 is formed to be recessed from the second end face 33b in the direction away from the edge 22c in the axial direction of the body 21 (upward in the figure). The groove 37 is formed over one full rotation around the central axis AX (see Figure 1). In this case, the groove 37 is annular when viewed from the axial direction. In the adapter 33B, a gap is formed between the part where the groove 37 is provided and the edge 22c. In other words, the edge 22c does not come into contact with the portion of the adapter 33B where the groove 37 is provided. On the other hand, the portion of the second end face 33b where the groove 37 is not provided comes into contact with the edge 22c of the body 21.

[0025] In the example shown in Figure 4, the adapter 33B has a corrosion-inhibiting portion 50 in at least a part of the portion covering the body 21, and the corrosion-inhibiting portion 50 includes a groove 37 formed on the second end face 33b, which is the surface of the adapter 33B. With this configuration, the edge 22c does not come into contact with the portion of the adapter 33B where the groove 37 is provided. Therefore, dissimilar metal contact between the adapter 33B and the body 21 can be avoided in the portion where the groove 37 is provided, thus preventing corrosion on the edge 22c of the body 21.

[0026] Figure 5 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. The cask 11C shown in Figure 5 has a different configuration of adapter 33C from the adapter 33 etc. described above. The differences will be described in detail below. As shown in Figure 5, adapter 33C has a welded part 38 as a corrosion suppression part 50. The welded part 38 is formed using a welding material that includes the same metal material as the edge 22c of the body part 21. In this embodiment, the edge 22c of the body part 21 is, for example, made of carbon steel and has a stainless steel cladding formed on its surface. Therefore, the welded part 38 can be configured similarly to the welded part 35 described above, for example, made of carbon steel and has a stainless steel cladding formed on its surface.

[0027] Furthermore, in the example shown in Figure 5, the welded portion 38 has a groove 39 in the portion facing the edge 22c of the body portion 21. Note that a recess 33f corresponding to the groove 39 is formed in advance on a part of the second end face 33b, and the welded portion 38 is formed with a uniform thickness on the second end face 33b and the first side surface 33d including the recess 33f, thereby forming the welded portion 38 to have a groove 39.

[0028] Figure 6 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. In the cask 11D shown in Figure 6, the adapter 33D has a welded portion 38D as a corrosion suppression portion 50. Furthermore, the portion of the welded portion 38D facing the edge 22c of the body portion 21 has a groove portion 39. In the example shown in Figure 6, the entire second end face 33g is formed to be the same height as the bottom of the recess 33f in Figure 5 described above. In this case, the welded portion 38D can be formed on the second end face 33g and the first side surface 33d with the groove portion 39.

[0029] According to the casks 11C and 11D shown in Figures 5 and 6, the contact area between the adapters 33C and 33D and the body 21 is made of the same type of metal. Therefore, contact between dissimilar metals between the adapters 33C and 33D and the body 21 can be avoided, thus preventing corrosion on the edge 22c and inner circumferential surface 22d of the body 21. Furthermore, the edge 22c does not come into contact with the portion of the adapters 33C and 33D where the groove 39 is provided. Therefore, contact between the adapters 33C and 33D and the body 21 can be avoided in the portion where the groove 39 is provided, thus preventing corrosion on the edge 22c of the body 21.

[0030] Figure 7 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. The cask 11E shown in Figure 7 differs from the adapter 33 etc. described above in the configuration of the adapter 33E. The differences will be described in detail below. As shown in Figure 7, the adapter 33E is provided with a welded part 40 as a corrosion suppression part 50. The configuration of the welded part 40 is the same as the configuration of the welded part 35 described above. In addition, the cask 11E is provided with a sealing member 51 between the adapter 33E and the edge 22c of the body 21, separately from the corrosion suppression part 50. The sealing member 51 is sandwiched between the welded part 40 and the edge 22c in the axial direction of the central axis AX (see Figure 1). In the example of Figure 7, the sealing member 51 is positioned, for example, on the radially outer side of the body 21 relative to the bolt hole 33h of the adapter 33E. The sealing member 51 may be positioned, for example, radially inside the body portion 21 relative to the bolt hole 33h of the adapter 33E, or it may be positioned on both the radially inside and outside sides of the body portion 21. For example, if a through hole is formed in the radial center of the adapter 33E, it is preferable to position the sealing member 51 radially inside the body portion 21 relative to the bolt hole 33h of the adapter 33E in order to suppress the intrusion of moisture through the through hole. Examples of the sealing member 51 include sheet materials such as paper, stainless steel, and zinc. As for the sealing member 51, for example, a material can be used whose corrosion potential is higher than that of the welded portion 40 of the adapter 33E and lower than that of the body portion 21.

[0031] Figure 8 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. The cask 11F shown in Figure 8 differs from the adapter 33 etc. described above in the configuration of the adapter 33F. The differences will be described in detail below. As shown in Figure 8, the adapter 33F is provided with a groove 41 as a corrosion suppression part 50. The configuration of the groove 41 is the same as the configuration of the groove 37 described above. In addition, the cask 11F is provided with a sealing member 52 between the adapter 33F and the edge 22c of the body 21, separately from the corrosion suppression part 50. The sealing member 52 is sandwiched between the second end face 33b and the edge 22c in the axial direction of the central axis AX (see Figure 1). In the example of Figure 8, the sealing member 52 is positioned, for example, on the radially outer side of the body 21 relative to the bolt hole 33h of the adapter 33F. The sealing member 52 may also be positioned in the groove 41. Examples of the sealing member 52 include sheet materials such as paper, stainless steel, and zinc. Furthermore, as the sealing member 51, for example, a material can be used whose potential is greater than that of the second end face 33b of the adapter 33F and less than that of the body portion 21.

[0032] According to the configuration of casks 11E and 11F shown in Figures 7 and 8, sealing members 51 and 52 are placed between the adapters 33E and 33F and the edge 22c, so that the space between the adapters 33E and 33F and the edge 22c can be properly sealed. This prevents corrosion of the edge 22c.

[0033] Figure 9 is a cross-sectional view showing another example of a part of the configuration of a radioactive material storage container according to this embodiment. The cask 11G shown in Figure 9 differs in the configuration of the adapter 33G from the adapter 33 etc. described above. The differences will be described in detail below. As shown in Figure 9, the adapter 33G does not have a corrosion suppression part, and a sealing member 53 is provided between the adapter 33G and the edge 22c of the body portion 21. The sealing member 53 is sandwiched in the axial direction of the central axis AX (see Figure 1) between the second end face 33b and the edge 22c. In the example of Figure 9, the sealing member 53 is positioned, for example, radially outward of the body portion 21 relative to the bolt hole 33h of the adapter 33G. The sealing member 53 may also be positioned, for example, radially inward of the bolt hole 33h of the adapter 33G. Examples of the sealing member 53 include sheet materials such as paper, stainless steel, and zinc. Furthermore, as the sealing member 53, for example, a material can be used whose potential is greater than that of the second end face 33b of the adapter 33G and less than that of the body portion 21.

[0034] According to the configuration of the cask 11G shown in Figure 9, a sealing member 53 is placed between the adapter 33G and the edge 22c, so that the space between the adapter 33G and the edge 22c can be properly sealed. This prevents corrosion of the edge 22c.

[0035] As described above, the radioactive material storage container according to the first embodiment comprises a body portion 21 having an opening 22 on one axial side and capable of storing radioactive material inside, and a closing portion 13 that is detachably attached to the opening 22 and capable of closing the opening 22. The closing portion 13 comprises a primary lid 31 and a secondary lid 32 (and a tertiary lid not shown) which are lids that are attached in common during storage and transport of radioactive material, and adapters 33, 33A, 33B, 33C, 33D, 33E, and 33F which are attached to the axial end of the body portion 21 during storage in place of the primary lid 31 and secondary lid 32 which have a sealing function and are attached during transport. The adapters 33, 33A, 33B, 33C, 33D, 33E, and 33F have a corrosion suppression portion 50 in at least a part of the portion that comes into contact with the body portion 21 to suppress corrosion of the body portion 21.

[0036] With this configuration, in adapters 33, 33A, 33B, 33C, 33D, 33E, and 33F, corrosion suppression parts 50 that suppress corrosion of the body 21 are arranged in at least a portion of the part that comes into contact with the body 21, thereby preventing corrosion of the part of the body 21 that is covered by the corrosion suppression parts 50.

[0037] A radioactive material storage container according to the second embodiment is a radioactive material storage container according to the first embodiment, wherein the body portion 21 is formed using a metal material, and the corrosion suppression portion 50 includes welded portions 35, 38, 38D, and 40 formed using welding material that includes the same metal material as the body portion 21.

[0038] In this configuration, the adapters 33, 33C, 33D, and 33E are positioned so that the welded parts 35, 38, 38D, and 40 are in contact with the edge 22c and inner surface 22d of the body 21. Therefore, the contact between the adapters 33, 33C, 33D, and 33E and the body 21 is made of the same type of metal. Consequently, contact between dissimilar metals between the adapters 33, 33C, 33D, and 33E and the body 21 can be avoided, thus preventing corrosion on the edge 22c and inner surface 22d of the body 21.

[0039] A radioactive material storage container according to the third embodiment is a radioactive material storage container according to the first or second embodiment, wherein the corrosion suppression portion 50 includes grooves 37, 39, and 41 provided on the surfaces of the adapters 33B, 33C, 33D, and 33F that come into contact with the body portion 21.

[0040] With this configuration, the portions of the body 21 corresponding to the grooves 37, 39, and 41 do not come into contact with the adapters 33B, 33C, 33D, and 33F. Therefore, dissimilar metal contact between the adapters 33B, 33C, 33D, and 33F and the body 21 can be avoided in the portions where the grooves 37, 39, and 41 are provided, thus preventing corrosion at the edge 22c of the body 21.

[0041] The radioactive material storage container according to the fourth embodiment is a radioactive material storage container according to any of the first to third embodiments, wherein the corrosion suppression part 50 includes a painted part 36 that covers the surface of the adapter 33A that comes into contact with the body part 21.

[0042] With this configuration, the adapter 33A is positioned so that the painted portion 36 is in contact with the edge 22c and inner circumferential surface 22d of the body portion 21. This avoids contact between dissimilar metals at the contact portion between the adapter 33A and the body portion 21, thereby preventing corrosion on the edge 22c and inner circumferential surface 22d of the body portion 21.

[0043] The fifth embodiment of the radioactive material storage container is a radioactive material storage container according to any of the first to fourth embodiments, further comprising sealing members 51 and 52 disposed between the adapters 33E and 33F and the body portion 21.

[0044] With this configuration, sealing members 51 and 52 are placed between the adapters 33E and 33F and the edge 22c, so that the space between the adapters 33E and 33F and the edge 22c can be properly sealed. This prevents corrosion of the edge 22c.

[0045] The technical scope of the present invention is not limited to the embodiments described above, and modifications can be made as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0046] 11,11A,11B,11C,11D,11E,11F,11G Cask 12 Cask body 13 Closing part 21 Torso 22 Opening 22c edge 22d Inner surface 22e Outer surface 23 Cavity 24 Basketball 25 cells 26 Outer cylinder 27 Heat transfer fins 28 Resin 29 Bottom 30 Trunnion 31 Primary lid 32 Secondary lid 33, 33A, 33B, 33C, 33D, 33E, 33F, 33G Adapters 33a 1st end face 33b,33g 2nd end surface 33c 3rd end face 33d First side view 33e 2nd side 33f recess 33h, 34 bolt holes 35, 38, 38D, 40 Welded section 36 Painted section 37, 39, 41 Grooves 50 Corrosion Inhibition Section 51, 52, 53 Sealing members AX center axis

Claims

1. A body having an opening on one side in the axial direction and capable of housing radioactive material inside, A closing part that is detachably attached to the opening and capable of closing the opening. Equipped with, The closing portion includes a lid that is attached in common to the storage and transport of the radioactive material, and an adapter that is attached to the axial end of the body during storage in place of the lid that has a sealing function and is attached during transport. The adapter has a corrosion-inhibiting portion in at least a portion of the part that comes into contact with the body to suppress corrosion of the body. A container for storing radioactive materials.

2. The aforementioned body is formed using a metal material, The corrosion-inhibiting portion includes a welded portion formed using welding material containing the same metal material as the body portion. A radioactive material storage container according to claim 1.

3. The corrosion-inhibiting portion includes a groove provided on the surface of the adapter that contacts the body portion. A radioactive material storage container according to claim 1.

4. The corrosion-inhibiting portion includes a painted portion that covers the surface of the adapter that comes into contact with the body portion. A radioactive material storage container according to claim 1.

5. The adapter and the body portion are further provided with a sealing member positioned between them. A radioactive material storage container according to claim 1.

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