Radioactive waste storage separator, radioactive waste storage container, and radioactive waste storage method

Abstract

To improve the filling rate of radioactive waste in a storage container.SOLUTION: A separator 1 is provided comprising a base member 2 placed inside a storage container 11 for storing multiple pieces of radioactive waste 21 and provided with multiple engaging parts 2a configured to allow support members 3 that can be in contact with radioactive waste 21 to be selectively attached thereto.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a separator for storing radioactive waste, a radioactive waste storage container, and a method for storing radioactive waste. [Background technology]

[0002] For example, Patent Document 1 describes a container for storing radioactive waste. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5079374 Summary of the Invention [Problem to be solved by the invention]

[0004] Radioactive waste is, for example, low-level waste contaminated by radioactivity at nuclear facilities. This waste is dismantled into fragments, which are then placed in storage containers and transported to a radioactive waste disposal site. The fragments are generally stored or disposed of in the storage containers. Reducing the number of storage containers reduces costs and the storage space required. Therefore, it is desirable to store the radioactive waste neatly and efficiently inside the storage containers, thereby improving the loading rate of the radioactive waste.

[0005] The present disclosure aims to solve the above-mentioned problems and to provide a separator for storing radioactive waste, a radioactive waste storage container, and a method for storing radioactive waste that can improve the filling rate of the storage container with radioactive waste. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a separator for storing radioactive waste according to one embodiment of the present disclosure includes a base member having a plurality of engaging portions to which a support member that is arranged inside a storage container that stores a plurality of radioactive wastes and that can come into contact with the radioactive wastes can be selectively attached.

[0007] In order to achieve the above-mentioned object, a radioactive waste storage container according to one aspect of the present disclosure includes a storage container for storing multiple radioactive wastes and the above-mentioned separator.

[0008] In order to achieve the above-mentioned object, a radioactive waste storage method according to one embodiment of the present disclosure uses a storage container for storing multiple pieces of radioactive waste, and a base member having multiple engaging portions to which support members that are placed inside the storage container and can come into contact with the radioactive waste can be selectively attached, and includes the steps of attaching the support members to the base member based on the size and / or shape of disassembled pieces of the radioactive waste, placing the base member inside the storage container, and storing the disassembled pieces inside the storage container in water or air, aligning the disassembled pieces along the support members. [Effects of the Invention]

[0009] The present disclosure can improve the loading rate of radioactive waste into storage containers. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a separator for storing radioactive waste according to an embodiment. [Figure 2] FIG. 2 is an assembled perspective view of the separator for storing radioactive waste according to the embodiment. [Figure 3] FIG. 3 is a perspective view of a separator for storing radioactive waste according to an embodiment. [Figure 4] FIG. 4 is a perspective view of the radioactive waste storage container according to the embodiment, in which separators are arranged. [Figure 5] FIG. 5 is a flowchart of the radioactive waste storage method according to the embodiment. [Figure 6-1]FIG. 6-1 is a perspective view of an example of radioactive waste according to an embodiment. [Figure 6-2] FIG. 6-2 is a perspective view of an example of radioactive waste according to an embodiment. [Figure 6-3] FIG. 6-3 is a perspective view of an example of radioactive waste according to an embodiment. [Figure 6-4] FIG. 6-4 is a perspective view of an example of radioactive waste according to an embodiment. [Figure 7] FIG. 7 is a perspective view of the radioactive waste storage container according to the embodiment, in which radioactive waste is stored. [Figure 8] FIG. 8 is a plan view of the radioactive waste storage container according to the embodiment, in which radioactive waste is stored. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical.

[0012] As shown in FIGS. 1 to 3, a separator (separator for storing radioactive waste) 1 of the embodiment includes a base member 2, a support member 3, and a hanging portion 4.

[0013] The base member 2 is formed in a size and shape to be stored and placed inside a storage container (radioactive waste storage container) 11, which will be described later, as shown in Fig. 4. In this embodiment, the base member 2 is formed in a plate shape to match the size and shape of the bottom surface 11a of the storage container 11 so that it is placed along the bottom surface 11a. That is, when placed inside the storage container 11, the base member 2 is formed in a size and shape so that its plate-like surface matches the bottom surface 11a of the storage container 11 and its periphery is positioned very close to the peripheral wall surface 11b of the storage container 11 so that it can come into contact with the peripheral wall surface 11b, thereby restricting movement in a direction along the bottom surface 11a. Alternatively, the base member 2 may be formed in a plate shape to match the size and shape of the peripheral wall surface 11b of the storage container 11 so that it is placed along the peripheral wall surface 11b. That is, when the base member 2 is placed inside the storage container 11, the base member 2 is formed in a size and shape such that its plate-like surface fits against a predetermined peripheral wall surface 11b of the storage container 11, and its peripheral edge is positioned very close to the bottom surface 11a and other peripheral wall surfaces 11b of the storage container 11 so as to be in contact with them, thereby restricting movement in a direction along the predetermined peripheral wall surface 11b. In the embodiment, the storage container 11 is formed in a rectangular parallelepiped shape with a rectangular bottom surface 11a and rectangular peripheral wall surfaces 11b, and the base member 2 is formed in a rectangular shape that matches the size and shape of the bottom surface 11a and peripheral wall surfaces 11b.

[0014] The base member 2 has an engaging portion 2a to which the support member 3 can be attached. The engaging portion 2a is preferably formed as a through-hole that penetrates the plate. The engaging portion 2a can be formed, for example, as a female screw hole into which the male screw of the support member 3 is screwed.

[0015] As shown in Fig. 2, the support member 3 is attached to the engagement portion 2a of the base member 2. In this embodiment, the support member 3 includes a rod-shaped support portion 3a that is inserted into the engagement portion 2a, which is a through-hole, and a fixing portion 3b that is provided at the end of the rod-shaped support portion 3a and engages with the engagement portion 2a. For example, when the engagement portion 2a is a female screw hole, the fixing portion 3b can be configured as a male screw. The fixing portion 3b may be attached to the engagement portion 2a in accordance with the shape of the engagement portion 2a.

[0016] As shown in Fig. 4, the support member 3 is attached to the engaging portion 2a of the base member 2, and when the base member 2 is placed inside the storage container 11, the support portions 3a stand in a storage space 11c formed by the bottom surface 11a and each peripheral wall surface 11b of the storage container 11. The support members 3 use the support portions 3a to divide the storage space 11c according to the size and / or shape of the dismantled pieces 21a, 21b, 21c, and 21d (see Figs. 6-1 and 6-2) of the radioactive waste 21. The support portions 3a of the support member 3 may be configured to divide the storage space 11c according to the size and / or shape of the dismantled pieces 21a, 21b, 21c, and 21d of the radioactive waste 21, and may be formed, for example, in the shape of a plate or a basket that can accommodate the dismantled pieces, although this is not shown in the figures.

[0017] Although not shown in the figure, the hanging portion 4 is used to hang the separator 1 by hanging a hook or the like of a hanging device. As shown in FIG. 3 , the hanging portion 4 is provided on the base member 2 or the support member 3. The hanging portion 4 provided on the base member 2 is configured as, for example, an eyebolt. The hanging portion 4, which is an eyebolt, is attached to the engaging portion 2a of the base member 2. The hanging portion 4, which is an eyebolt, includes a support 4a and a fixing portion 4b provided at the end of the support 4a and engaging with the engaging portion 2a. For example, if the engaging portion 2a is a female threaded hole, the fixing portion 4b can be configured as a male screw. The fixing portion 4b may be attached to the engaging portion 2a in accordance with the shape of the engaging portion 2a. The hanging portion 4 may be fixed to the base member 2. The hanging portion 4 provided on the support member 3 is fixed to the supporting portion 3a of the supporting member 3. In this embodiment, the hanging portion 4 is fixed to the upper end of the rod-shaped supporting portion 3a.

[0018] The base member 2, support member 3 and hanging portion 4 of the separator 1 described above are formed of a corrosion-resistant metal material such as stainless steel.

[0019] As shown in FIG. 4, in this embodiment, the storage container 11 is formed as a rectangular box with a rectangular bottom surface 11a and rectangular peripheral walls 11b surrounding the bottom surface 11a. The storage container 11 has a storage space 11c surrounded by the bottom surface 11a and the peripheral walls 11b. The storage space 11c includes an opening 11d that opens upward at the upper end of the peripheral walls 11b. The opening 11d of the storage space 11c is closed by a lid (not shown) fixed to the upper end of the peripheral walls 11b. The storage container 11 has a drain hole 11e that leads from the bottom surface 11a to the outside of the storage space 11c and a plug 11f that can open and close the drain hole 11e. Although not shown in the figure, the storage container 11 is configured to be hung by a hook or the like of a hanging device. Such a storage container 11 is formed of a corrosion-resistant metal material, such as stainless steel.

[0020] FIG. 5 is a flowchart of the radioactive waste storage method according to the embodiment.

[0021] The radioactive waste storage method is performed using the separator 1 and storage container 11 described above. In step S1 of the radioactive waste storage method, a support member 3 is attached to a base member 2 based on the size and / or shape of dismantled pieces 21a, 21b, 21c, and 21d. The dismantled pieces 21a, 21b, 21c, and 21d are, for example, radioactive waste 21 containing low-level activated metals obtained by dismantling reactor internal structures. The dismantled piece 21a shown in FIG. 6-1 is, for example, a curved plate-like piece obtained by dismantling piping. The dismantled piece 21b shown in FIG. 6-2 is, for example, a curved plate-like piece obtained by dismantling piping that is thicker than the dismantled piece 21a. The dismantled piece 21c shown in FIG. 6-3 is, for example, a block-like piece. The dismantled piece 21d shown in FIG. 6-4 is, for example, a rod- or pipe-like piece. In step S1, support members 3 are attached to the base member 2 based on the size and / or shape of the disassembled pieces 21a, 21b, 21c, and 21d so that the disassembled pieces 21a, 21b, 21c, and 21d can be arranged neatly and without gaps in the storage space 11c inside the storage container 11. Before step S1, the radioactive waste 21 is disassembled into disassembled pieces 21a, 21b, 21c, and 21d, and then transported to the water in the work pool. In step S1, a portion of the base member 2, which is the through-hole of the engaging portion 2a, is left unattached to the support members 3, so that the plate-shaped portion of the base member 2 has a through-hole. Step S1 also includes the attachment of the hanging portion 4. Step S1 can be performed in air because the separator 1 is not in contact with the radioactive waste 21 and is not activated, but it can also be performed underwater.

[0022] In the radioactive waste storage method, in step S2, as shown in FIG. 4, the separator 1 (base member 2) is placed inside the storage container 11. The base member 2 is placed along the bottom surface 11a of the storage container 11. The support members 3 attached to the base member 2 are arranged in rows in the storage space 11c inside the storage container 11. In step S2, the separator 1 is hung by a hanging device via the hanging parts 4 and placed inside the storage container 11. This step S2 can be performed in air because the separator 1 and storage container 11 are not in contact with the radioactive waste 21 and are not activated, but it can also be performed underwater. If step S2 is not performed underwater, the storage container 11 is carried underwater in step S3.

[0023] 7 and 8, in the radioactive waste storage method, in step S4, dismantled pieces 21a, 21b, 21c, and 21d are stored in storage space 11c inside storage container 11 along support member 3. Dismantled pieces 21a, 21b, 21c, and 21d are hung by a hanging device and placed inside storage container 11. Because dismantled pieces 21a, 21b, 21c, and 21d are placed in storage space 11c inside storage container 11 along support member 3, storage is easily achieved by support member 3. Furthermore, because dismantled pieces 21a, 21b, 21c, and 21d are placed in storage space 11c inside storage container 11 along support member 3, their posture is maintained by support member 3 so that they do not fall over or become displaced inside storage container 11. After disassembly pieces 21a, 21b, 21c, and 21d have been placed inside the corresponding storage container 11, in step S5, opening 11d of storage container 11 is closed with a lid (not shown).

[0024] Thereafter, in step S6 of the radioactive waste storage method, storage container 11 is suspended by a suspension device and pulled out of the water. Here, in the steps up to step S5, storage container 11 has plug 11f open and drain hole 11e open, and when it is pulled out of the water in step S6, water that had filled storage space 11c is drained through drain hole 11e. At this time, in storage space 11c of storage container 11, water is drained to bottom surface 11a of storage container 11 through the through-hole (engagement portion 2a) of base member 2 of parapet 1. Then, after storage container 11 is pulled out of the water and drained, plug 11f is closed and drain hole 11e is closed.

[0025] The separator (separator for storing radioactive waste) 1 of the above-described embodiment includes a base member 2 having a plurality of engaging portions 2a to which a support member 3 that is arranged inside a storage container 11 that stores a plurality of radioactive wastes 21 and can come into contact with the radioactive wastes 21 can be selectively attached.

[0026] According to this separator 1, by selectively attaching a support member 3 that can come into contact with the radioactive waste 21 to a base member 2 arranged inside the storage container 11, the radioactive waste 21 can be stored inside the storage container 11 while maintaining its posture. Therefore, the separator 1 allows the radioactive waste 21 to be stored neatly in the storage container 11 with few gaps. As a result, the separator 1 can improve the filling rate of the radioactive waste 21 in the storage container 11. The base member 2 may be fixed inside the storage container 11, or may be configured as the inner surface of the storage container 11.

[0027] In the separator 1 of the embodiment, the base member 2 is formed in a plate shape that is disposed along the inner surface of the storage container 11, and the engaging portion 2a is formed as a through-hole that penetrates the plate-like base member 2.

[0028] According to this separator 1, the base member 2 is formed in a plate shape that is placed along the inner surface of the storage container 11, thereby preventing it from interfering with the storage of the radioactive waste 21. Furthermore, according to this separator 1, the base member 2 is formed in a plate shape that is placed along the inner surface of the storage container 11, thereby preventing the inner surface of the storage container 11 from being damaged by the radioactive waste 21. Furthermore, according to this separator 1, the engaging portion 2a is formed as a through-hole that penetrates the plate-like shape of the base member 2, thereby allowing the engaging portion 2a to be used as a drain hole, thereby improving the drainage performance of the storage container 11.

[0029] Moreover, the separator 1 of the embodiment further includes a hanging portion 4 provided on at least one of the support member 3 and the base member 2 for hanging.

[0030] According to this separator 1, the inclusion of the hanging portion 4 improves handling properties.

[0031] In addition, in the separator 1 of the embodiment, the hook portion 4 is selectively attached to the engagement portion 2a.

[0032] This separator 1 allows for greater freedom in arranging the hanging portion 4, and further improves handling.

[0033] In the separator 1 of the embodiment, the support member 3 is formed in a rod shape and attached to the base member 2 in an upright position.

[0034] According to this separator 1, the support member 3 does not interfere with the storage of the radioactive waste 21 in the storage container 11, and storage can be carried out smoothly.

[0035] Moreover, the separator 1 of the embodiment is made of a metal material having corrosion resistance.

[0036] According to this separator 1, the radioactive waste 21 is stored in the storage container 11 underwater to prevent radiation leakage, and therefore durability can be improved by using a corrosion-resistant metal material.

[0037] Moreover, the storage container (radioactive waste storage container) 11 of the embodiment has the separator 1 described above disposed therein.

[0038] This storage container 11 allows the radioactive waste 21 to be stored while maintaining its posture. Therefore, the storage container 11 can store the radioactive waste 21 in an orderly manner with few gaps. As a result, the storage container 11 can improve the filling rate of the radioactive waste 21.

[0039] Furthermore, the storage container 11 of the embodiment has a drain hole 11e.

[0040] According to this storage container 11, the radioactive waste 21 is stored underwater to prevent radiation leakage, and therefore the water inside can be drained.

[0041] In addition, the radioactive waste storage method of the embodiment uses a storage container 11 that stores multiple radioactive wastes 21, and a base member 2 that has multiple engaging portions 2a to which support members 3 that are placed inside the storage container 11 and can come into contact with the radioactive wastes 21 can be selectively attached, and includes the steps of attaching the support members 3 to the base member 2 based on the size and / or shape (at least one of the size and shape) of the radioactive wastes 21, placing the base member 2 inside the storage container 11, and storing the radioactive wastes 21 inside the storage container 11 along the support members 3 in water or in air.

[0042] According to this radioactive waste storage method, the radioactive waste 21 can be stored while maintaining its posture. Therefore, the radioactive waste 21 can be stored in the storage container 11 in an orderly manner with few gaps. As a result, the filling rate of the radioactive waste 21 in the storage container 11 can be improved.

[0043] The present disclosure includes the following inventions. [Invention 1] A separator for storing radioactive waste, comprising a base member having a plurality of engaging portions to which a support member that is disposed inside a storage container for storing a plurality of radioactive wastes and that can contact the radioactive wastes can be selectively attached. [Invention 2] The base member is formed in a plate shape and arranged along the inner surface of the storage container, and the engagement portion is formed as a through hole that penetrates the plate shape of the base member. A separator for storing radioactive waste according to Invention 1. [Invention 3] Further, the support member and the base member may include a hanging portion provided on at least one of the support member and the base member. A separator for storing radioactive waste according to invention 1 or 2. [Invention 4] The hook portion is selectively attached to the engagement portion. A separator for storing radioactive waste according to Invention 3. [Invention 5] The support member is formed in a rod shape and attached upright to the base member. 5. A separator for storing radioactive waste according to any one of inventions 1 to 4. [Invention 6] Made of corrosion-resistant metal material, 6. A separator for storing radioactive waste according to any one of inventions 1 to 5. [Invention 7] A separator for storing radioactive waste according to any one of inventions 1 to 6 is disposed inside. Radioactive waste storage container (storage container). [Invention 8] Has drainage holes A radioactive waste storage container according to invention 7. [Invention 9] Using the radioactive waste storage container (storage container) described in Invention 7, attaching a support member to a base member based on the size and / or shape of the radioactive waste; placing the base member within the container; a step of storing the radioactive waste inside the storage container along the support member in water or air; A method for storing radioactive waste, comprising: [Explanation of symbols]

[0044] 1 Separator (separator for storing radioactive waste) 2 Base material 2a Engagement part 3 Support member 4 Hanging part 11 Storage container (radioactive waste storage container) 11a Bottom (inner surface) 11b Surrounding wall surface (inner surface) 11e Drain hole 21 Radioactive waste

Claims

1. A separator for storing radioactive waste, comprising a base member having a plurality of engaging portions to which a support member that is disposed inside a storage container for storing a plurality of radioactive wastes and that can contact the radioactive wastes can be selectively attached.

2. The base member is formed in a plate shape and arranged along the inner surface of the storage container, and the engagement portion is formed as a through hole that penetrates the plate shape of the base member.

2. The separator for storing radioactive waste according to claim 1.

3. Further, the support member and the base member may include a hanging portion provided on at least one of the support member and the base member.

2. The separator for storing radioactive waste according to claim 1.

4. The hook portion is selectively attached to the engagement portion. The separator for storing radioactive waste according to claim 3.

5. The support member is formed in a rod shape and attached upright to the base member.

2. The separator for storing radioactive waste according to claim 1.

6. Made of corrosion-resistant metal material, 2. The separator for storing radioactive waste according to claim 1.

7. A separator for storing radioactive waste according to any one of claims 1 to 6 is disposed inside the separator. Radioactive waste storage container.

8. Has drainage holes 8. The radioactive waste storage container according to claim 7.

9. a storage container for storing a plurality of radioactive wastes; and a base member having a plurality of engaging portions to which a support member that is disposed inside the storage container and that can come into contact with the radioactive wastes can be selectively attached; Using attaching the support member to the base member based on the size and / or shape of the radioactive waste; placing the base member within the container; a step of storing the radioactive waste inside the storage container along the support member in water or air; A method for storing radioactive waste, comprising:

Images