Container for radioactive waste

Abstract

To prevent the capacity of radioactive waste from being limited and a drain pipe from being damaged.SOLUTION: A storage vessel 100 for radioactive wastes includes a bottomed square cylindrical body 1 having a storage space 1S for storing the radioactive wastes, and a lid 2 for closing an opening formed at one end of the body 1. In an upper view of the body 1 when the body 1 is viewed from the opening part side, a cutout part is formed at a corner part of the body 1 from the opening part toward a bottom part 12 of the body 1. The drain pipe 31 is disposed in the cutout portion. A through hole 21 is formed at a position facing the cutout part in the lid body 2 in a state that the lid body 2 closes the opening part of the body 1. The plug member 51 is disposed in the through hole 21 of the lid 2.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a storage container for storing radioactive waste. [Background technology]

[0002] During decommissioning of nuclear power plants, when cutting or dismantling high-dose objects (hereinafter referred to as "reactor internals") such as reactor internals, control rods, and channel boxes, one possible method is to cut and dismantle the reactor internals while they are immersed in water to prevent the spread of radioactivity and shield them from radiation. The reactor internals (hereinafter referred to as "radioactive waste") cut and dismantled underwater must be placed in a container (hereinafter referred to as "containment vessel") for subsequent processing and storage. Storing radioactive waste in a container underwater has the advantage of preventing the spread of radioactivity and maintaining radiation shielding even during the containment process. The container containing the radioactive waste is then removed from the water and transported to another location for solidification and storage.

[0003] When radioactive waste is stored in a storage container underwater, water is also stored inside the container. If water is left inside, it can cause various problems, such as excessive weight making transportation inefficient, radiation from the radioactive waste breaking down the water to generate hydrogen, which could cause an explosion, and corrosion of the inner surface of the container if it is made of metal.

[0004] Therefore, a structure capable of discharging water from a storage container has been proposed. For example, the container described in Patent Document 1 is a container for storing the above-mentioned reactor internals (radioactive waste) that have been cut and dismantled underwater, and has a storage body and a lid, with a through-hole formed in the storage body. The water inside is discharged through the through-hole in the storage body.

[0005] The storage vessel described in Patent Document 2 is a vessel for storing spent nuclear fuel, etc., and is not a vessel for storing reactor internal structures (radioactive waste) that have been cut and dismantled underwater as described above, but it has the following drainable structure. The storage container described in Patent Document 2 has a container body and a primary lid, etc., with a drainage hole provided in the primary lid and a drainage pipe connected to the drainage hole. The drainage pipe is arranged vertically in the storage space where spent nuclear fuel etc. is stored, and extends from the primary lid to near the bottom of the container body. Water inside the container is sucked up from the lower end of the drainage pipe and discharged outside the container. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-1860 [Patent Document 2] Publication number 7-34395 Summary of the Invention [Problem to be solved by the invention]

[0007] The storage vessel for storing spent nuclear fuel and the like described in Patent Document 2 is generally cylindrical, and the spent nuclear fuel rods are often stored upright in the storage space. Therefore, even if drainage pipes are arranged upright in the storage space as described in Patent Document 2, it is thought that this will not have much of an effect on the storage capacity of the spent nuclear fuel rods or on the storage work.

[0008] However, in a storage container for radioactive waste that has been cut and disassembled underwater, such as that described in Patent Document 1, the radioactive waste is randomly stored in the storage space. If drainage pipes are arranged vertically in this storage space, the stored radioactive waste will interfere with the drainage pipes, limiting the storage capacity for radioactive waste. There is also a risk of the drainage pipes being damaged.

[0009] An object of the present invention is to provide a storage container for radioactive waste that does not have a limited capacity for storing radioactive waste and that does not pose a risk of damaging the drainage pipe. [Means for solving the problem]

[0010] The radioactive waste storage container of the present invention is a radioactive waste storage container comprising a bottomed, square cylindrical body having a storage space for storing radioactive waste, and a lid body that covers an opening on the opposite side of the bottom of the body, wherein when viewed from above the body from the opening side, a cutout is formed in a corner of the body from the opening toward the bottom of the body, and when the lid body is covering the opening of the body, a through hole is formed in the lid body at a position opposite the cutout, and the container is equipped with a drainage pipe that is placed in the cutout and a plug member that is placed in the through hole.

[0011] In the above configuration, a protective cover may be provided on the drain pipe on the opposite side of the side wall portion of the body. The protective cover may be disposed along the longitudinal direction of the drain pipe.

[0012] In the above configuration, when viewed from above the fuselage, the cutout portions may be formed at multiple corners of the fuselage, the drain pipes may be arranged in each of the multiple cutout portions, and the protective cover may be arranged on the opposite side of each of the multiple drain pipes from the side wall portion of the fuselage.

[0013] In the above configuration, the through hole may have a first hole portion and a second hole portion formed at a position farther from the cutout portion than the first hole portion and having a larger outer diameter than the first hole portion, the first hole portion and the second hole portion forming a step portion in the through hole, the plug member may have a first plug portion arranged in the first hole portion and a second plug portion arranged in the second hole portion and having a larger outer diameter than the first hole portion, the first plug portion and the second plug portion forming a plug step portion in the plug member, and the plug step portion may be arranged at the step portion of the through hole.

[0014] In the above configuration, more than half of the drain pipe may be disposed in the cutout portion when viewed from above the body. [Effects of the Invention]

[0015] It is possible to provide a storage container for radioactive waste that does not have a limited capacity for storing radioactive waste and that does not pose a risk of damaging the drainage pipe. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an external view of a radioactive waste storage container according to an embodiment; [Figure 2] 2 is a cross-sectional view of the radioactive waste storage container shown in FIG. 1 taken along line II-II. [Figure 3] 3 is a cross-sectional view of the radioactive waste storage container shown in FIG. 1 taken along line III-III. [Figure 4] 4 is an enlarged view of the first corner and its surroundings (IV) of FIG. 3. [Figure 5] 2 is a cross-sectional view of the radioactive waste storage container shown in FIG. 1 taken along line VV. [Figure 6] FIG. 6 is an enlarged view of a portion (VI) surrounded by a dashed line in FIG. 5. [Figure 7] 10A to 10C are partial cross-sectional views sequentially showing steps for discharging water from the storage container. [Figure 8] 10A to 10C are partial cross-sectional views sequentially showing steps for discharging water from the storage container. [Figure 9] 10 is an external view of the storage container when the water inside the storage container is being discharged. FIG. [Figure 10] FIG. 10 is a cross-sectional view of a radioactive waste storage container according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments will be described with reference to the drawings.

[0018] [Radioactive waste container] Fig. 1 shows a radioactive waste storage container 100. Hereinafter, the "radioactive waste storage container" may be simply referred to as the "storage container." The storage container 100 is prismatic, and Fig. 1 shows a roughly cubic storage container 100 as an example. The storage container 100 is a container that mainly stores reactor internals (radioactive waste) that have been cut up or dismantled at a nuclear power plant or the like.

[0019] As shown in FIG. 1, the storage container 100 includes a body 1 and a lid 2.

[0020] Fig. 2 shows a cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 shows a cross-sectional view taken along line III-III in Fig. 1. The cross-sectional view shown in Fig. 3 is similar to a view of the fuselage 1 seen from the opening side (viewed from above the fuselage 1), and therefore, hereinafter, when describing the view of the fuselage 1 seen from above, the cross-sectional view shown in Fig. 3 may be used.

[0021] The body 1 of the storage container 100 is a rectangular tubular body with a bottom. Figures 1 to 3 show a case where the body 1 is a rectangular tubular body with a bottom. As shown in Figure 2, the body 1 has a side wall portion 11 and a bottom portion 12. The body 1 has a storage space 1S formed therein for storing radioactive waste.

[0022] As shown in FIG. 2, the lid 2 closes the opening on the opposite side of the bottom 12 of the body 1. The lid 2 is detachable from the body 1. The lid 2 is attached to the body 1, for example, with bolts. In this specification, the direction in which the lid 2 and the bottom 12 of the body 1 face each other is referred to as the "vertical direction," and in the vertical direction, the lid 2 side is referred to as the "upper side" and the bottom 12 side is referred to as the "lower side."

[0023] The body 1 and the lid 2 are made of, for example, metal. The material of the body 1 and the lid 2 may be, for example, iron, carbon steel, or stainless steel. The storage container 100 may be made of, for example, a steel plate.

[0024] (Configuration of the corners of the fuselage and its surrounding areas) As shown in FIG. 3, the fuselage 1 has four corners (or four angular portions). The four corners (or four angular portions) are formed by the side wall portions 11. In FIG. 3, the four corners are indicated as a first corner 11a, a second corner 11b, a third corner 11c, and a fourth corner 11d. In this specification, in FIG. 3 and when viewed from above the fuselage 1, the portion of the curved portion of the side wall portions 11 facing the storage space 1S is referred to as a "corner," and the portion of the curved portion of the side wall portions 11 opposite the storage space 1S, in other words, the portion facing the outside of the fuselage 1, is referred to as a "corner."

[0025] 3, a drain pipe 31 is disposed at a first corner 11a of the four corners of the body 1. A protective cover 41 is disposed near the drain pipe 31.

[0026] FIG. 4 shows an enlarged view of the first corner 11a of FIG. 3 and its surroundings (enlarged view of IV in FIG. 3). As shown in FIG. 4, a cutout 11A is formed in the first corner 11a. The cutout 11A is cut out toward the corner. The cutout 11A is formed to a size that allows the drainage pipe 31 to be placed therein. The entire drainage pipe 31 is placed in the cutout 11A. The drainage pipe 31 is fitted into the cutout 11A. By placing the cutout 11A in the corner in this way, it is possible to ensure a thickness equivalent to that of the side wall 11 required for radiation shielding, even when the cutout 11A is placed.

[0027] The protective cover 41 is disposed on the opposite side of the drain pipe 31 from the side wall portion 11. The protective cover 41 is disposed on the storage space 1S side of the drain pipe 31. In FIG. 4 and when viewed from above the body 1, the protective cover 41 has a mountain-like shape that convexly faces away from the drain pipe 31.

[0028] Fig. 5 shows a cross-sectional view taken along line VV in Fig. 1. The cross-sectional view taken along line VV in Fig. 1 is a vertical cross-sectional view of the storage container 100 passing through the first corner 11a and the third corner 11c shown in Fig. 3. Fig. 6 shows an enlarged view of a portion (IV) surrounded by a dashed dotted line in Fig. 5.

[0029] As shown in FIG. 5, the drain pipe 31 and the protective cover 41 are arranged in the vertical direction. The protective cover 41 is arranged along the longitudinal direction of the drain pipe 31. As shown in FIG. 6, the cutout portion 11A is formed in the vertical direction. The cutout portion 11A is formed from the opening at one end of the body 1 toward the bottom 12. In FIG. 6, the cutout portion 11A is formed from the opening at one end of the body 1 to near the bottom 12. Note that the cutout portion 11A may also be formed from the opening at one end of the body 1 to the bottom 12.

[0030] As shown in Figures 5 and 6, when the cover 2 covers the opening at one end of the body 1, the upper end of the drain pipe 31 is close to the cover 2. The upper end of the drain pipe 31 has a gap so that it does not come into contact with the cover 2. The upper end of the drain pipe 31 may be located in the through-hole 21 of the cover 2. The lower end of the drain pipe 31 is located at a gap from the bottom 12 of the body 1, for example, as shown in Figures 5 and 6. The lower end of the drain pipe 31 is close to the bottom 12.

[0031] As shown in Figures 5 and 6, the upper end of the protective cover 41 is located at a height close to the height of the upper end of the drain pipe 31. In Figures 5 and 6, the upper end of the protective cover 41 is located at a height slightly lower than the upper end of the drain pipe 31. The upper end of the protective cover 41 may be located at the same height as the upper end of the drain pipe 31. The lower end of the protective cover 41 is located at the same height as the lower end of the drain pipe 31. The lower end of the protective cover 41 may be located at a height close to the lower end of the drain pipe 31, for example, at a height above or below the lower end of the drain pipe 31.

[0032] There is no particular limitation on the method for arranging the drain pipe 31 in the vertical direction as shown in Fig. 5. For example, the drain pipe 31 may be arranged in the vertical direction by fitting the drain pipe 31 into the cutout portion 11A shown in Fig. 6. Alternatively, the upper end of the drain pipe 31 may be fitted into the through hole 21 of the lid 2, so that the drain pipe 31 is arranged in the vertical direction.

[0033] 5, there is no particular limitation on the method for arranging the protective cover 41 along the longitudinal direction of the drain pipe 31. For example, the protective cover 41 may be arranged along the longitudinal direction of the drain pipe 31 by attaching it to the side wall portion 11 or the bottom portion 12 of the body 1.

[0034] There are no particular limitations on the materials of the drain pipe 31 and the protective cover 41. The drain pipe 31 and the protective cover 41 may be made of, for example, metal. The drain pipe 31 and the protective cover 41 may be made of, for example, the same material as the body 1 or the lid 2.

[0035] 4 and 6, the cutout 11A in which the drain pipe 31 is disposed is closed in the vertical direction by the protective cover 41. The protective cover 41 is disposed in the vertical direction between the storage space 1S and the drain pipe 31 and the cutout 11A.

[0036] (Through hole and plug in the lid) As shown in Fig. 5, a through hole 21 is formed in the lid 2. A plug member 51 is disposed in the through hole 21. In Fig. 5 and subsequent figures, hatching showing the cross section of the plug member 51 is omitted.

[0037] 6, when the lid 2 covers the opening at one end of the body 1, a through-hole 21 is formed in the lid 2 at a position opposite the notch 11A. The through-hole 21 penetrates the lid 2 in the thickness direction (vertical direction).

[0038] The through hole 21 has a first hole portion 21a and a second hole portion 21b that have different outer shapes. In this embodiment, the first hole portion 21a and the second hole portion 21b are cylindrical. In this case, the difference in the outer shapes of the first hole portion 21a and the second hole portion 21b is the difference in the outer diameter of the first hole portion 21a and the second hole portion 21b.

[0039] The outer diameter of the second hole 21b is larger than the outer diameter of the first hole 21a. The second hole 21b is farther from the storage space 1S than the first hole 21a. The second hole 21b is located higher than the first hole 21a. The first hole 21a and the second hole 21b are in communication with each other in the thickness direction (vertical direction) of the lid 2.

[0040] The first hole portion 21a and the second hole portion 21b, which have different outer shapes, form a step portion in the through hole 21.

[0041] The plug member 51 has a first plug portion 51a and a second plug portion 51b which have different outer shapes.

[0042] In this embodiment, the first plug portion 51a and the second plug portion 51b are cylindrical. In this case, the difference in the outer shapes of the first plug portion 51a and the second plug portion 51b is the difference in the outer diameters of the first plug portion 51a and the second plug portion 51b. The outer diameter of the second plug portion 51b is larger than the outer diameter of the first plug portion 51a. Furthermore, the outer diameter of the second plug portion 51b is larger than the outer diameter of the first hole portion 21a below the through hole 21 shown in FIG. 6. The second plug portion 51b is connected to one end (the upper end in FIG. 6) of the first plug portion 51a.

[0043] The first plug portion 51a and the second plug portion 51b, which have different outer shapes, form a plug step portion in the plug member 51. There are no particular limitations on the material of the plug member 51. The plug member 51 is made of, for example, metal.

[0044] 6, the first plug portion 51a having a small outer shape is placed in the first hole portion 21a having a small outer shape. The second plug portion 51b having a large outer shape is placed in the second hole portion 21b having a large outer shape. This causes the step portion of the through hole 21 and the plug step portion of the plug member 51 to overlap. In this specification, this is referred to as "the plug stepped portion of the plug member 51 is disposed in the stepped portion of the through hole 21."

[0045] Furthermore, threaded portions may be formed on at least a part of the plug member 51 and at least a part of the through hole 21, and these may be screwed together. Fig. 6 shows a configuration example in which a male thread is formed on the second plug portion 51b, a female threaded second hole portion 21b is formed in the lid body 2, and the second plug portion 51b is screwed into the second hole portion 21b of the lid body 2. Note that the plug member 51 may be inserted into the through hole 21 without being screwed into it.

[0046] The above-described storage container 100 is used as follows. 1 is submerged in water. After radioactive waste is contained in the body 1 underwater, the body 1 is closed with the lid 2, and the container 100 is pulled out of the water.

[0047] After the storage container 100 is pulled out of the water, the water is drained from inside the storage container 100. An example of a method for draining the water from inside the storage container 100 will be described below with reference to FIGS.

[0048] As shown in the left diagram of FIG. 7, the plug member 51 is removed from the through-hole 21 of the lid body 2.

[0049] A tool 60 shown in the right diagram of FIG. 7 is prepared. The tool 60 has a drain pipe 61 and a gas pipe 62. The drain pipe 61 has a long portion in the vertical direction, and the gas pipe 62 is formed on the outside of the middle portion of the drain pipe 61. The lower part of the drain pipe 61 is inserted into the through hole 21 of the lid body 2. The lower part of the drain pipe 61 is inserted into the through hole 21 and the drain pipe 31 (left diagram of FIG. 8). A part of the gas pipe 62 is also inserted into the through hole 21.

[0050] Gas is supplied from the gas pipe 62 and drained from the drain pipe 61. As shown in the right diagram of FIG. 8, the gas supplied from the gas pipe 62 passes through the outside of the drain pipe 61 of the through-hole 21 and is supplied to the storage space 1S. The gas presses against the water in the storage space 1S, making it easier for the water to be discharged from the lower end of the drain pipe 31 through the drain pipe 31. The end opposite the lower end of the drain pipe 61 may be connected to, for example, a pressure reducing device or an air suction device.

[0051] In order to reduce radiation exposure during the drainage work, for example, as shown in FIG. 9, the drainage work may be performed by placing the storage container 100 in a shielding container 200 that shields against radiation. The shielding container 200 has an opening through which the tool 60 shown in FIGS. 7 and 8 can be placed. Instead of the shielding container 200, a shielding wall that shields against radiation may be provided around the storage container 100. The shielding container 200 and the shielding wall are made of a material that can shield against radiation. Note that the drainage work may be performed without using the shielding container 200 or the shielding wall.

[0052] The above-mentioned drainage method is an example, and other methods may be used for drainage.

[0053] The above-described storage container 100 provides the following effects. Water within the storage container 100 shown in Figure 5 is drained through the through-hole 21 of the lid 2 using a drain pipe 31. As shown in Figures 3 and 4, the drain pipe 31 is arranged in the cutout portion 11A of the first corner portion 11a of the body 1. The cutout portion 11A was previously part of the side wall portion 11. By arranging the drain pipe 31 in this portion, the drain pipe 31 becomes arranged as part of the side wall portion 11. As a result, when radioactive waste is stored in the storage space 1S, the radioactive waste does not interfere with the drain pipe 31, and the storage capacity for radioactive waste is not limited. In addition, there is no risk of the drain pipe 31 being damaged.

[0054] Furthermore, since the plug member 51 is disposed in the through hole 21 of the lid 2, leakage of radiation from the through hole 21 can be suppressed.

[0055] Furthermore, the radioactive waste storage container 100 of this embodiment is a container that mainly stores reactor internals (radioactive waste) cut or dismantled at a nuclear power plant or the like. In this case, as shown in FIG. 3 and other figures, the body 1 of the storage container 100 is a rectangular tubular body with a bottom, and the thickness from corner to corner of the curved portion of the side wall 11 is thicker than the thickness of the straight portion. The straight portion is between two adjacent curved portions. The "thickness" here refers to the thickness of the side wall 11 along a straight line passing through the center of the storage space 1S when viewed from above the body 1 (see FIG. 3, which is similar to a top view of the body 1). Because the thickness of the curved portion of the side wall 11 having the first corner 11a is thicker than the thickness of the straight portion, even if a notch 11A is formed at the first corner 11a in which a drainage pipe 31 for drainage can be disposed, the thickness of the curved portion of the side wall 11 is sufficiently ensured, ensuring a thickness equivalent to that of the straight portion of the side wall 11 required for radiation shielding. Therefore, the shielding performance of the curved portion of the side wall portion 11 having the first corner portion 11a is ensured.

[0056] As described above, according to the storage container 100, the shielding performance is ensured, the storage capacity of radioactive waste is not limited, and there is no risk of the drainage pipe 31 being damaged.

[0057] 4, a protective cover 41 is disposed so as to close the notch 11A. The protective cover 41 makes it more difficult for radioactive waste to interfere with the drainage pipe 31.

[0058] 6, a step is formed in the through hole 21 of the lid 2. A plug step is formed in the plug member 51. The plug step of the plug member 51 is disposed in the step of the through hole 21. As a result, even if radiation passes through the first hole portion 21a of the through hole 21, the radiation is blocked or scattered by the second plug portion 51b and the wall portion of the lid 2 that defines the through hole 21, and is therefore less likely to leak to the outside. This can further suppress radiation leakage.

[0059] Although the embodiments of the present invention have been described above with reference to the drawings, it should be understood that the specific configurations are not limited to these embodiments. The scope of the present invention is defined by the claims rather than the above description, and includes all modifications within the meaning and scope of the claims.

[0060] For example, in the above embodiment, as shown in Figure 4, the entire drain pipe 31 is disposed in the cutout portion 11A of the first corner portion 11a. However, a portion of the drain pipe 31 may be disposed in the cutout portion 11A. In this case, when viewed from above the body 1 of the storage container 100 (see Figure 4, which is similar to a portion of this figure), it is preferable that more than half of the drain pipe 31 is disposed in the cutout portion 11A. For example, in Figure 4, a semi-cylindrical portion of the drain pipe 31 may be disposed in the cutout portion 11A.

[0061] 4, a protective cover 41 is disposed on the opposite side (the storage space 1S side) of the drain pipe 31 from the side wall portion 11 of the body 1. However, the protective cover 41 does not necessarily have to be disposed.

[0062] 4, the protective cover 41 is not disposed in the cutout 11A. However, a part or all of the protective cover 41 may be disposed in the cutout 11A. In this case, it is preferable to make the cutout 11A a cutout that can accommodate the drainage pipe 31 and the protective cover 41. Even with such a cutout, a certain degree of thickness is ensured in the curved portion of the side wall 11, thereby ensuring radiation shielding performance.

[0063] The shape of the protective cover 41 can also be changed. In the above embodiment, when viewed from above the fuselage 1 (see Figures 3 and 4, which are similar to views of the fuselage 1 from above), the protective cover 41 has a mountain shape that convex on the side opposite the drain pipe 31. However, when viewed from above the fuselage 1, the protective cover 41 may have, for example, a curved shape that convex on the side opposite the drain pipe 31, or a straight shape that is not convex.

[0064] 4, the drain pipe 31 is fitted into the cutout 11A and is in contact with the side wall 11 of the body 1. However, the drain pipe 31 may simply be disposed in the cutout 11A. The drain pipe 31 does not have to be in contact with the side wall 11 of the body 1.

[0065] In the above embodiment, as shown in Figures 3 and 4, a cutout 11A is formed in one of the four corners (first corner 11a), and a drain pipe 31 is arranged in the cutout 11A. However, cutouts may be formed in two or more of the multiple corners, and a drain pipe may be arranged in each cutout. Also, a protective cover may be arranged on the side of each drain pipe opposite the side wall of the body (on the storage space side).

[0066] For example, as shown in the cross-sectional view of Fig. 10, which is similar to a top view of the body 1 of the storage container, cutouts may be formed in two of the four corners, and a drain pipe may be arranged in each cutout. In the configuration shown in Fig. 10, a cutout 11A is formed in the first corner 11a, and a drain pipe 31 is arranged in this cutout 11A. A protective cover 41 is arranged on the opposite side of the drain pipe 31 from the side wall 11 of the body 1 (the storage space 1S side). Furthermore, a cutout 11C is formed in the third corner 11c, and a drain pipe 31 is arranged in this cutout 11C. A protective cover 41 is arranged on the opposite side of the drain pipe 31 from the side wall 11 of the body 1 (the storage space 1S side).

[0067] In this way, by forming cutouts in two or more of the multiple corners and arranging drainage pipes in the cutouts, if one of the drainage pipes is damaged, the other drainage pipes can be used to drain the water. Furthermore, draining water using multiple drainage pipes increases drainage efficiency. Furthermore, if protective covers are placed on each drainage pipe, radioactive waste is less likely to interfere with each drainage pipe.

[0068] In the above embodiment, as shown in Fig. 6, the lower end of the drain pipe 31 is located above the bottom 12 of the body 1. However, the configuration of the drain pipe 31 is not limited to the above configuration. For example, the lower end of the drain pipe 31 may extend to the bottom 12 and bend along the corner between the side wall 11 and the bottom 12. Note that a drain basin may be provided below the drain pipe 31 so that water accumulated in the drain basin can be drained.

[0069] Furthermore, the shapes of the through-hole 21 of the lid 2 and the plug member 51 shown in FIGS. 5 and 6 can be changed. For example, the through hole 21 does not have to have a step portion, and the plug member 51 does not have to have a plug step portion. 5 and 6 penetrates in the thickness direction (vertical direction) of the lid 2. However, the penetration direction of the through-hole 21 does not have to be the thickness direction (vertical direction) as long as the through-hole 21 penetrates from the part of the lid 2 facing the storage space 1S to the part facing the outside of the storage container 100.

[0070] Furthermore, the shape of the storage container 100 is not limited to the shape shown in Fig. 1. The shape of the body 1 of the storage container 100 is not limited to the shapes shown in Figs. 2 and 3, etc. For example, the body 1 may be a bottomed angular cylinder other than a bottomed rectangular cylinder. Even if the body 1 has such a shape, the same effects as those of the above embodiment can be obtained for the same reasons as those described above. [Explanation of symbols]

[0071] 100 Radioactive waste container (container) 1. Torso 1S Storage Space 2 Lid 11 Side wall 11a 1st corner 11b 2nd corner 11c 3rd corner 11d Fourth corner 11A Notch 12 Bottom 21 Through hole 21a 1st hole 21b 2nd hole 31 Drainage pipe 41 Protective cover 51 Plug member 51a First plug section 51b Second plug part 60 Tools 61 Drain pipe 62 Gas Pipe 200 Shielded Container

Claims

1. a bottomed rectangular cylindrical body having a storage space for storing radioactive waste; a lid that closes an opening on the opposite side of the bottom of the body; A radioactive waste container comprising: a cutout portion is formed in a corner of the trunk from the opening toward a bottom of the trunk in a top view of the trunk seen from the opening side, a through hole is formed in the lid body at a position facing the notch portion in a state where the lid body closes the opening of the body, A drainage pipe disposed in the cutout portion; a plug member disposed in the through hole; Equipped with A container for storing radioactive waste.

2. a protective cover disposed on the opposite side of the side wall portion of the body with respect to the drainage pipe; The protective cover is disposed along the longitudinal direction of the drainage pipe.

2. The radioactive waste storage container according to claim 1.

3. When viewed from above, the notched portions are formed at a plurality of corners of the fuselage, The drainage pipe is disposed in each of the plurality of cutout portions, The protective cover is disposed on the side opposite to the side wall portion of the body for each of the plurality of drainage pipes.

3. A container for storing radioactive waste according to claim 2.

4. the through hole has a first hole portion and a second hole portion that is formed at a position farther from the notch portion than the first hole portion and has an outer shape larger than that of the first hole portion; a step portion is formed in the through hole by the first hole portion and the second hole portion, the plug member has a first plug portion disposed in the first hole portion and a second plug portion disposed in the second hole portion and having an outer shape larger than that of the first hole portion, a plug step portion is formed in the plug member by the first plug portion and the second plug portion, The plug step portion is disposed in the step portion of the through hole.

4. A container for storing radioactive waste according to claim 1.

5. When viewed from above the body, more than half of the drain pipe is disposed in the cutout portion. A container for storing radioactive waste according to any one of claims 1 to 3.

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