JP2018132334A - Garbage storage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a garbage storage container which is divided into a container body and a lid body, so as to be easily and efficiently transported and installed.SOLUTION: The garbage storage container includes a container body 5 having a trunk 3 with one open end, and a lid body 6 having a handling head 9 and a peripheral part to be fixed to the open end 4 of the container body 5. The open end 4 of the container body 5 and the peripheral part of the lid body 6 include a locking mechanism 19 which locks the movement in the axial direction when the container body and the lid body are brought close to each other and relatively rotated for fitting together.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste storage container that stores radioactive waste, and more particularly to a waste storage container that facilitates transportation and installation of a divided container body and a lid body.

  Radioactive waste generated in a nuclear power plant nuclear reactor is stored in a waste storage container, and is transported to a storage facility or reprocessing facility by a ship, a vehicle, or the like for storage or reprocessing.

  As a waste storage container for storing radioactive waste generated in a nuclear reactor, there is a container having a handling head that is reduced in diameter from a barrel portion at the top of a cylindrical barrel portion with a bottom (see Patent Document 1). ).

  It is known that the radioactive waste stored in the waste storage container contains water such as crystallization water, and hydrogen generation due to radiolysis from the crystallization water cannot be avoided. Therefore, when radioactive waste is sealed in the waste storage container, it is assumed that the internal pressure will rise abnormally. Therefore, it is necessary to provide an opening in the waste storage container to allow hydrogen gas to escape.

  For this reason, a gas discharge port is formed in the handling head of Patent Document 1, a filter is provided in the gas discharge port, and the gas discharge port can be closed by a screwed lid. The waste container of Patent Document 1 can be transported and installed by holding the handling head with a robot such as a manipulator.

  A glass solidified body in which molten glass obtained by melting radioactive waste is filled in a stainless steel container (canister) can be stored in the waste storage container from the gas discharge port having a reduced diameter in Patent Document 1.

  However, when storing solid solid waste such as fuel debris caused by a nuclear accident in the waste storage container of Patent Document 1, the diameter of the gas discharge port is smaller than that of the trunk. The operation of gripping solid waste by a robot and storing it in a waste storage container becomes very difficult. For this reason, there is a problem that it takes a long time for the carrying-in work and the work efficiency cannot be increased. In addition, since the diameter of the gas discharge port is small, the solid solid waste and the radioactive waste contained in the container (including the solidified glass) can be stored in the waste storage container with high storage efficiency. There wasn't. In Patent Document 1, the gas discharge port is closed with a screwed lid. However, the technical configuration of how to hold and transport the screwed lid and install it by screwing is completely different. Not disclosed.

  For this reason, there is a container body in which an upper part of a cylindrical body with a bottom is opened and a lid part that closes an open end of the container body (see Patent Document 2).

  In patent document 2, since the upper part of the trunk | drum is open | released, radioactive wastes, such as a container containing radioactive waste and a solid waste, can be accommodated in a waste storage container with high storage efficiency. In Patent Document 2, a trunnion protruding from the outer peripheral surface of the container body is provided, and the container body can be transported, installed, and the like by holding the trunnion with a robot.

JP 2001-264486 A JP, 2006-183875, A

  However, in the waste storage container of Patent Document 2, a trunnion for carrying, transporting, and setting by a robot is projected on the outer peripheral surface of the container main body, so that the occupation area of the waste storage container becomes large. . Furthermore, there is a problem that the robot that holds the trunnion and carries the container main body becomes large, which makes it difficult to operate the trunnion with the robot.

  Moreover, in patent document 2, although the three-step cover part by a primary cover, a secondary cover, and a tertiary cover is provided, it is technical about how to hold, convey, and install these covers. No configuration is disclosed.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a waste container that can easily carry and install the divided container body and lid body.

The present invention comprises a container body with one end of the body part opened, and a lid body that includes a handling head and fixes a peripheral part to the open end of the container body,
A waste storage container provided with a locking mechanism that engages the open end of the container main body and the peripheral edge of the lid main body with each other close to each other and relatively rotates to lock the movement in the axial direction. is there.

  In the waste storage container, the locking mechanism is provided on a plurality of hooks projecting from the inner surface of the container body near the open end, and on the lower surface of the lid body in the vicinity of the peripheral edge corresponding to the hooks. And a hook portion having a locking end that is formed and enters the lower side of the hook by rotation.

  Further, in the waste container, a gas discharge port is formed in the handling head of the lid body, and a filter for preventing the discharge of foreign substances is formed in the gas discharge port, and the filter covers the filter to prevent water from entering. A temporary lid can be provided.

  In the waste storage container, a lid fixing member is provided outside the filter at the gas discharge port, and the central portion of the temporary lid is screwed into the lid fixing member. A holding bolt that can fix the temporary lid to the gas discharge port protrudes outward.

  According to the waste container of the present invention, it is possible to achieve an excellent effect that the divided container body and the lid body can be transported and installed easily and efficiently.

(a) is a side view of the waste storage container of the present invention in which the container main body and the lid main body are divided, and (b) is an enlarged longitudinal sectional view showing a part of (a). It is a side view of the waste storage container which assembled the container main body and lid main body of FIG. (a), (b) is a top view which shows arrangement | positioning of the hook provided in a container main body. (a) is a longitudinal sectional view showing a state in which the lid body is suspended and placed on the container body, (b) is a view of the state of (a) as seen from the inside of the container body, and (c) is on the container body. FIG. 4D is a longitudinal sectional view showing a state in which the lid body placed on is rotated to engage the locking mechanism, and FIG. 6D is a view of the state of FIG. It is a longitudinal cross-sectional view which shows the other example of the step provided in the open end vicinity of a container main body, and the peripheral part vicinity of a lid | cover main body. It is a longitudinal cross-sectional view which shows the state which welded the container main body and the lid main body. (a) is a longitudinal cross-sectional view which shows the state which stored the solid waste of the lump state in the inside of a waste storage container, (b) is a horizontal sectional view of (a). (a) is the longitudinal cross-sectional view which shows the state which accommodated the radioactive waste containing a container in the inside of a waste storage container, (b) is a horizontal sectional view of (a). It is a longitudinal cross-sectional view which shows the state which removed the temporary cover from the gas discharge port of the handling head, and discharge | released gas. It is a longitudinal cross-sectional view which shows the state which obstruct | occludes a gas discharge port with the lid | cover for obstruction | occlusion when hydrogen generation reduces.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 (a) and 1 (b) show the configuration of the waste container of the present invention. The waste container 1 of the present invention is open at one end which is the upper end of the body 3 having the bottom 2. The container body 5 having the opened end 4 and the lid body 6 that can be fixed and closed to the open end 4 of the body 3 of the container body 5 are provided.

  At the center of the lid body 6 is provided a handling head 9 which is reduced in diameter and protrudes upward and has a flange 8 formed at the upper end of the reduced diameter portion 7.

  A gas discharge port 10 is formed at the center of the handling head 9. At the gas discharge port 10, a ceramic filter 11 (filter) for preventing foreign matters such as dust inside the container body 5 from being discharged to the outside, and an attachment of the handling head 9 so as to cover the ceramic filter 11 A temporary lid 13 that is installed on the seat 12 and prevents water from entering the inside of the container body 5 is provided. In addition to the ceramic filter 11, filters made of various materials having durability can be used.

  A lid fixing member 14 is provided above the ceramic filter 11 of the gas discharge port 10. The lid fixing member 14 has a hole 14a through which gas can pass. The lid fixing member 14 may be a rod-shaped material or a plate material provided in the diameter direction of the gas discharge port 10.

  At the center of the temporary lid 13, a gripping bolt 16 that can fix the temporary lid 13 to the mounting seat 12 by being screwed into a screw portion 15 provided on the lid fixing member 14 protrudes outward. . The temporary lid 13 can be attached to and detached from the mounting seat 12 of the handling head 9 by gripping the grip bolt 16 by a robot. A seal member 17 (gasket) is provided between the temporary lid 13 and the mounting seat 12 and in a through-hole portion of the grip bolt 16 with respect to the temporary lid 13 so as to be sealed.

  As shown in FIG. 1 (b), a downward stepped portion 18 into which the horizontal open end 4 of the container body 5 is fitted is formed at the peripheral edge of the lid body 6. Here, a groove for welding the open end 4 of the container main body 5 and the stepped portion 18 of the lid main body 6 is in a lateral direction located on the outer peripheral surface of the container main body 5.

  Further, as shown in FIGS. 3 and 4, the container body 5 is fitted in the vicinity of the open end 4 and the vicinity of the peripheral edge portion of the lid body 6 by rotating them relatively close to each other. A locking mechanism 19 is provided to lock the movement in the axial direction.

  The locking mechanism 19 is formed on a plurality of hooks 20 projecting at a plurality of locations inside the vicinity of the open end 4 of the container body 5, and on the lower surface of the lid body 6 in the vicinity of the peripheral edge corresponding to each of the hooks 20. An L-shaped hook portion 22 having a locking end 21 that enters the lower side of the hook 20 by rotation is configured. The locking mechanism 19 is not limited to the configuration shown in FIG. 4, but the lid body 6 may be provided with a hook 20, and the container body 5 may be provided with an L-shaped hook portion 22. Various shapes can be adopted as long as the container body 5 and the lid body 6 can be locked to each other by relatively rotating.

  Two or more hooks 22 and hooks 22 are provided. FIG. 3A shows the case where the hooks 20 are provided at two locations in the diameter direction, and FIG. The case where three places are provided at a distance is shown. Even when two hooks 20 are provided as shown in FIG. 3A, when the hook 20 is lifted by the locking end 21 of the hook portion 22, the open end 4 of the container body 5 and the stepped portion of the lid body 6. Since 18 is opposed as a horizontal mirror surface, the container body 5 is prevented from tilting with respect to the lid body 6 and can be stably lifted. The number of the 20 and the hook portions 22 is not limited to two or three, but may be four or more.

  FIG. 5 shows a case where two steps 18 a and 18 b are provided in the vicinity of the open end 4 of the container body 5 and the periphery of the lid body 6 so that the lid body 6 is fitted to the container body 5. The groove for welding the container main body 5 and the lid main body 6 in this case is upward facing the upper surface of the lid main body 6. The number of steps provided on the open end 4 of the container body 5 and the peripheral edge of the lid body 6 is arbitrary.

  Next, the operation of the above embodiment will be described.

  The container main body 5 and the lid main body 6 shown in FIGS. 1 (a) and 1 (b) are manufactured at a factory or the like. The lid main body 6 is provided with a ceramic filter 11 and a lid fixing member 14. Further, the handling head 9 is attached. The temporary lid 13 is attached to the seat 12 by screwing the grip bolt 16 into the screw portion 15 of the lid fixing member 14.

  The lid body 6 lifted by a crane or the like as shown in FIGS. 1 (a) and 1 (b) is suspended so that the hook portion 22 is located inside the container body 5 as shown in FIGS. 4 (a) and 4 (b). Lower and place the step 18 on the open end 4 of the container body 5. Subsequently, as shown in FIGS. 4 (c) and 4 (d), the lid body 6 is rotated so that the locking end 21 of the hook portion 22 enters the lower portion of the hook 20. At this time, the L-shaped hook portion 22 comes into contact with the hook 20 so that the rotation is stopped. Thereby, the container main body 5 and the lid main body 6 are locked in a state in which movement in the axial direction is prevented by the locking mechanism 19.

  As shown in FIG. 2, the waste storage container 1 in which the lid body 6 is attached to the container body 5 in a factory or the like is carried into a nuclear power plant. The container body 5 and the lid body 6 may be separately carried into a nuclear power plant and assembled in the nuclear power plant.

  The waste container 1 is fed from a partition wall (not shown) that divides a radioactive atmosphere into a working room having a radioactive atmosphere.

  The waste storage container 1 sent into the working chamber holds the reduced diameter portion 7 of the handling head 9 of the lid body 6 with a robot such as a manipulator, lifts the waste storage container 1 and stores radioactive waste by filling it. Move to the storage stage to be installed.

  Subsequently, after the handling head 9 is gripped by the robot and the lid body 6 is rotated in the direction opposite to that in the case of FIG. 4 to release the locking by the locking mechanism 19, the lid body 6 is lifted to the standby position. Install.

  Inside the container main body 5 with the open end 4 opened, a solid solid waste 23 (radioactive waste) that has been dried as shown in FIG. 7 or a radioactive waste 24 in a container shown in FIG. (Radioactive waste) is gripped and stored by the robot. At this time, since the open end 4 of the container main body 5 is open, the work of storing the solid waste 23 and the radioactive waste 24 in the container into the inside of the container main body 5 becomes easy and work efficiently. Can do. Furthermore, as shown in FIGS. 7 and 8, the solid waste 23 and the radioactive waste 24 in the container can be stored in the container body 5 with high storage efficiency.

  When the operation of storing the radioactive waste in the container main body 5 is completed, the robot grasps the handling head 9 of the lid main body 6 installed in the standby place, lifts and moves the lid main body 6 to the upper part of the container main body 5. . Then, the lid body 6 is lowered, the stepped portion 18 is installed on the open end 4 of the container body 5, and the lid body 6 is rotated as shown in FIGS. 4 (c) and 4 (d) to engage the hook portion 22. By engaging the stop 21 into the lower part of the hook 20, the locking mechanism 19 locks the movement of the container body 5 and the lid body 6 in the axial direction.

  Subsequently, the handling head 9 is gripped by a robot to lift the waste storage container 1, and the waste storage container 1 is still transported and installed on the welding stage. In the welding stage, as shown in FIG. 6, the robot performs welding along the welding groove between the container body 5 and the lid body 6. Here, the welding posture in the case of FIG. 6 is horizontal. On the other hand, in the case of FIG. 5, since the welding groove is formed on the upper surfaces of the container body 5 and the lid body 6, the welding of the welding groove can be performed downward. By this welding, the waste container 1 in which the container body 5 and the lid body 6 are integrated by the welding portion 25 is obtained.

  Next, the waste container 1 that has been welded is lifted by a handling head 9 by a robot, conveyed to a decontamination stage, and installed. At the decontamination stage, the surface of the waste container 1 is decontaminated. At this time, since the gas discharge port 10 of the handling head 9 is sealed by the temporary lid 13, the water at the time of decontamination is prevented from entering the waste container 1. Therefore, it is possible to prevent the problem that the decontamination water enters into the waste container 1 and the amount of hydrogen gas generated due to radiolysis increases.

  The decontaminated waste storage container 1 is transported and installed on a storage stage by a robot and temporarily stored on the storage stage.

  In the storage stage, the grip bolt 16 is gripped by the robot, and the temporary lid 13 installed on the handling head 9 is removed, and the state shown in FIG. 9 is obtained. As a result, a gas such as hydrogen generated by radiation decomposition of the water inside the waste container 1 is discharged to the outside from the gas discharge port 10. Thereby, the problem that the pressure inside the waste container 1 becomes abnormally high is prevented. Since the ceramic filter 11 is provided in the gas discharge port 10, foreign matter such as radioactive dust is prevented from being discharged to the outside.

It should be noted that the amount of hydrogen scavenging air required during storage may be very small. For example, the amount of hydrogen generated in each container over 50 years is about 10 liters, and the amount of scavenging gas is about 200 liters. Therefore, even in the case of 1000 storage systems, it is possible to limit moisture by scavenging with 4000 liters = 4 m ³ of dry nitrogen gas or the like every year, and to prevent waste from re-absorbing.

  When the radioactive waste radiation attenuates after storage is completed and hydrogen generation is reduced, as shown in FIG. 10, a closing lid 27 having a gripping rod 26 gripped by a robot is provided. The closing lid 27 is installed on the mounting seat 12 by being screwed into the screw portion 15 of the lid fixing member 14, and the periphery of the closing lid 27 is welded and fixed to the handling head 9. Thereby, it can be set as the waste storage container completely sealed by the welding part 28. FIG. In the above description, the case where the gas discharge port 10 is closed by the newly provided closing lid 27 has been described. However, the peripheral edge of the temporary lid 13 may be welded to the handling head 9 and sealed.

  If no gas is generated from the radioactive waste as the contents, the temporary lid 13 is fixed from the beginning by welding or the like without the lid main body 6 having the ceramic filter 11 or the lid fixing member 14. It can also be sealed.

  As described above, the waste container 1 of the present invention is divided into the container main body 5 and the lid main body 6, and the handling head 9 is opposed to the container main body 5 whose one end of the body 3 is opened at the open end 4. A lid main body 6 having a detachable attachment is attached via a locking mechanism 19. Accordingly, the lid main body 6 can be lifted by holding the handling head 9 with a robot, and the container main body 5 can be lifted via the lid main body 6. Therefore, the robot (hanging tool) can be shared, and the container main body 5 And the work of carrying and installing the lid body 6 can be performed easily and efficiently.

  Further, since the radioactive waste can be stored inside the container main body 5 with the open end 4 of the container main body 5 open, the work of storing the radioactive waste inside the waste storage container 1 is easy. And the storage efficiency can be increased.

  In addition, the locking mechanism 19 includes hooks 20 provided at a plurality of locations on the inner surface of the container body 5 in the vicinity of the open end 4, and the vicinity of the peripheral edge of the lid body 6 so that the container body 5 can be fitted correspondingly. The lid body 6 and the container body 5 can be reliably attached and detached with a simple configuration.

  Further, since the gas discharge port 10 is formed in the handling head 9 of the lid body 6, hydrogen accompanying the radiolysis of water contained in the radioactive waste is discharged from the gas discharge port 10 to the outside and the pressure becomes abnormal. Prevent rising problems. Furthermore, since the gas discharge port 10 is provided with the ceramic filter 11 for preventing the discharge of foreign matter, radioactive dust and the like can be prevented from being discharged to the outside. Furthermore, since the gas discharge port 10 is provided with the temporary lid 13, it is possible to prevent water from entering the waste storage container 1 when the waste storage container 1 is decontaminated.

  A lid fixing member 14 is provided outside the ceramic filter 11 at the gas discharge port 10. In addition, a gripping bolt 16 is provided at the center of the temporary cover 13 so as to protrude outwardly by screwing it into the cover fixing member 14 so that the temporary cover 13 can be airtightly fixed to the gas discharge port 10. The temporary lid 13 can be attached to and detached from the handling head 9 by grasping by a robot.

  Note that the waste container of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Waste container 3 Trunk part 4 Open end 5 Container body 6 Lid body 9 Handling head 10 Gas discharge port 11 Ceramic filter (filter)
13 Temporary lid 14 Lid fixing member 16 Grasp bolt 19 Locking mechanism 20 Hanging 21 Locking end 22 Hook

Claims (4)

A container body having one end of the body part opened; and a lid body that includes a handling head and fixes a peripheral edge to the open end of the container body;
A waste storage container provided with a locking mechanism that engages the open end of the container main body and the peripheral edge of the lid main body by bringing them close to each other and relatively rotating them to lock the movement in the axial direction.   The locking mechanism includes hooks protruding at a plurality of positions on the inner surface near the open end of the container body, and formed on the lower surface near the peripheral edge of the lid body corresponding to the hooks. The waste container according to claim 1, further comprising a hook portion having a locking end that enters the lower side.   A gas discharge port is formed in the handling head of the lid body, and the gas discharge port includes a filter that prevents the release of foreign matter, and a temporary lid that covers the filter and prevents water from entering. The waste container as described in 2.   A lid fixing member is provided outside the filter at the gas discharge port, and the temporary lid is fixed to the gas discharge port by screwing into the lid fixing member at the center of the temporary cover. The waste container according to claim 3, wherein a gripping bolt that can be protruded outward.

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