JP3917998B2 - Storage system, and storage container and container transport device used for storage system - Google Patents

Description

  The present invention relates to a storage system for storing and managing a storage container containing a radioactive substance, a storage container used in the storage system, and a container transport device.

  Highly radioactive materials typified by spent nuclear fuel are dismantled and reprocessed to recover useful materials that can be used again as fuel, such as plutonium. These spent fuels are stored in a sealed state until reprocessing. As a method for storing such a high radioactive substance, a dry method using a storage container such as a cask attracts attention. There are various types of casks used in the dry process, and concrete casks, metal casks, and the like that shield spent fuel with concrete structures are known. These casks are provided with a cylindrical container body having an upper part and a bottom part, and in the case of a concrete cask, a cylindrical metal sealed container in which spent fuel is enclosed, a so-called canister, is stored in the container body, In the case of a metal cask, the spent fuel is directly enclosed in the container body.

As such a radioactive substance, for example, spent fuel of a nuclear reactor is usually processed by the following steps. First, spent fuel is stored in a canister in a storage pool of a nuclear power plant and sealed. The canister is stored in a transport container, a so-called transport cask, and then transported to a storage facility by a trailer or the like. In the storage facility, the transported canister is pulled out from the transport cask and loaded into a concrete cask prepared in advance. The canisters are stored for a predetermined period in a state of being stored in these casks. Further, after being stored for a predetermined period, the canister is taken out from the concrete cask, loaded into the transport cask again, and transported to a reprocessing facility by a trailer or the like (see, for example, Patent Document 1). A metal cask for both transportation and storage is also provided.
JP 2000-284094 A

  A storage facility for storing casks as described above is provided with a storage building for arranging a large number of casks side by side. Conventionally, in such a storage building, the overhead crane installed on the ceiling portion is used to load and unload the cask on the trailer and the like, and the overhead crane is used to transport and store the cask to a predetermined position. ing.

  However, when such an overhead crane is used, the floor height of the storage building increases due to the necessity of securing the traveling and lifting area of the overhead crane, and the storage building tends to be large compared to the storage capacity of the cask.

  In addition, concrete casks and metal casks are usually very heavy, about 100 to 200 tons. In order to lift and transport these casks with an overhead crane, a large overhead crane is required. There is also a risk of falling.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the size of the storage building, in particular, to reduce the height of the building floor and to easily and safely arrange the storage container at a desired position. It is an object of the present invention to provide a storage system, and a storage container and a container transport device used for the storage system.

In order to achieve the above object, the present invention proposes the following (1) to (9).
(1) In a storage system for storing a storage container containing a radioactive substance, a storage having a carry-in / out area for carrying in and out a metal cask as a storage container and a storage area for storing a number of metal casks. With a building,
The storage building is a one-story building with a lower floor height than the loading / unloading area without installing overhead cranes on both sides of the loading / unloading area extending across the central part in the longitudinal direction at right angles. And the storage area is formed in a square pedestal having a flat area larger than the bottom of the metal cask and having a pallet mounting portion on which an air pallet can be mounted. Is a container transporter that is transported and stored in an upright state in which the gantry is fixed to the bottom, and that travels in the storage building and transports the metal cask by an air pallet mounted on the pallet mounting part. Ru storage system der, characterized in that it comprises a device.
(2) The cylindrical metal cask is transported and stored in a standing state in which the base is fixed by four stoppers around the bottom of the metal container body in which the radioactive substance is sealed. The storage system according to (1), which is characterized.
(3) In a storage system for storing a storage container containing a radioactive substance, a storage building having a carry-in / out area for carrying in and out the storage container and a storage area for storing a large number of storage containers, The storage building is a one-story building with a lower floor height than the loading / unloading area without installing overhead cranes on both sides of the loading / unloading area extending across the central part in the longitudinal direction at right angles. And the storage container is a concrete cask, and has a concrete container body that houses a sealed container filled with a radioactive substance, and the concrete container body has an air pallet at the bottom. A pallet mounting part that can be mounted is provided, and the concrete cask is erected by an air pallet mounted on the pallet mounting part. Comprising a container transfer device for feeding a storage system, characterized by storing the concrete cask in upright condition.
(4) The container transport device is a cart that travels automatically or manually, an air pallet that is attached to the trolley and that can be mounted on the pallet mounting portion of the storage container, and an air diaphragm for the air pallet. The storage system for a storage container according to any one of (1) to (3), wherein the storage system is provided with an air supply unit.
(5) A refilling device is provided in the carry-in / carry-out area and refills a sealed container filled with a radioactive substance between the transport container transported to the carry-in / carry-out area and the storage container. (1) thru | or the storage system of the storage container of any one of (4) characterized by the above-mentioned.
(6) An exhaust tower having a large number of exhaust ports extends along the longitudinal direction at the center of the ceiling wall of the storage area, and a large number of intake air is provided at both side edges in the longitudinal direction of the ceiling wall. (1) A partition wall extending from the ceiling wall to the vicinity of the bottom wall is provided in the vicinity of the intake port, and an inflow path following the intake port is formed in the vicinity of the intake port (1) ) Or (3).

  According to the storage system configured as described above, each storage container such as a concrete cask or a metal cask is provided with a pallet mounting portion at the bottom. Then, a heavy cask is easily transported to any location by transporting the cask in a floating state using an air pallet mounted on the pallet mounting portion of any cask by a transport device that runs in the storage building. can do. At this time, compared with a case where the cask is suspended and transported by an overhead crane or the like, there is no danger of dropping or the like, and the cask can be transported safely. Moreover, it is not necessary to provide a large overhead crane in the ceiling part of the storage building, and the floor height of the storage building can be lowered and the entire building can be downsized.

(7) In the storage container used in the storage system according to (1), the cylindrical container body capable of storing the radioactive substance, and attached to the bottom of the container body, have a larger plane area than the bottom. A pallet mounting portion that is formed on the gantry and on which the air pallet can be mounted between the gantry and the installation surface;
It is provided with the storage container characterized by the above-mentioned .

  According to the storage container having the above-described configuration, since the gantry is provided at the bottom of the container body, the bottom area increases, and the entire container can be stably placed. Further, by mounting an air pallet on the pallet mounting portion provided on the gantry, the storage container can be easily transported using the air pallet.

(8) In the container transport device used in the storage system of (1) or (3),
A carriage that travels automatically or manually, an air pallet that is attached to the carriage and that is fixed to the bottom surface of the metal cask, or an air pallet that can be attached to a pallet attachment portion of the concrete cask bottom, An air supply section for supplying air to the plurality of air diaphragms of the air pallet;
It is provided with the container conveying apparatus characterized by the above-mentioned.
(9) The carriage has a driver's seat where an operator can get on, and the driver's seat is covered with a shielding material that shields radioactive substances to prevent the operator from being exposed to radiation. It is a container conveyance apparatus as described in (8).
According to the container transport device having such a configuration, a heavy storage container can be easily and safely transported to an arbitrary place using an air pallet.

As described above in detail, according to the present invention, the storage system can be reduced in size, in particular, the height of the building floor can be lowered, and the storage system in which the storage container can be easily and safely arranged at a desired position, and A storage container and a container transport device for use in a storage system can be provided.

Hereinafter, a storage system for a storage container according to an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 3, the storage system includes, for example, a storage building 10 formed in an elongated rectangular flat shape, a control building 12 for controlling the temperature, humidity, operation of various devices, etc. in the storage building, It has. The storage building 10 includes a carry-in / carry-out area 14 that extends across the central portion in the longitudinal direction at right angles, and storage areas 16 that are respectively formed on both sides of the carry-in / carry-out area 14.

  The storage building 10 is entirely formed of a concrete wall, and includes a bottom wall 20, a ceiling wall 22, and a plurality of side walls 24. In each storage area 16, an exhaust tower 26 having a large number of exhaust ports 25 is provided at the center of the ceiling wall 22 and extends along the long axis direction. In each storage area 16, a large number of air inlets 27 are provided at both side edges in the longitudinal direction of the ceiling wall 22. In the vicinity of the air inlet 27, a partition wall 30 extending from the ceiling wall 22 to the vicinity of the bottom wall 20 is provided, and an inflow path 33 that follows the air inlet is formed.

  In the carry-in / out area 14, a transport container sent from a nuclear power plant or the like, that is, a transport cask containing a canister as a sealed container in which a radioactive substance is sealed, and reprocessing from the storage building 10 are performed. The transport cask sent to the facility is carried out. The carry-in / out area 14 includes a temporary storage area 32 for the transport cask 31, a temporary storage area 34 for a metal cask or a concrete cask as a storage container, and a space between the storage container and the transport cask. A refilling device 36 for refilling the canister is provided. In addition, a loading / unloading exit 37 to the loading / unloading area 14 is formed on the side wall 24 of the storage building 10, and a trailer loaded with a transport cask 31 and the like enters and leaves the loading / unloading area 37. be able to.

  Each storage area 16 has a flat installation floor 40. And on the installation floor 40 of each storage area 16, many metal casks or concrete casks can be installed in arbitrary positions.

Next, a metal cask and a concrete cask as storage containers used in the present storage system will be described.
First, the concrete cask will be described. As shown in FIG. 4, the concrete cask 50 includes a container main body 52 that is formed of concrete and functions as a shielding structure, and a canister 54 is accommodated in the container main body. . The canister 54 is made of a metal and has a cylindrical sealed container with both ends closed. A plurality of spent fuel assemblies 58 are enclosed in the sealed container while being supported by a basket 56. Has been. These spent fuel assemblies 58 are, for example, spent fuels for nuclear reactors, and contain radioactive materials that generate heat due to decay heat and generate radiation.

  The container body 52 of the concrete cask 50 has a closed cylindrical shape at the bottom, and is formed to have a height of about 6 m and a diameter of about 4 m, for example, and the concrete wall thickness is about 1 m. Yes. The upper end opening of the container body 52 is closed by a concrete lid body 60 whose outer surface is covered with a carbon steel plate. The lid 60 is bolted to the upper end of the container body 52 with a plurality of bolts 61. In the concrete wall of the container main body 52, reinforcing bars (not shown) are provided.

  A cylindrical storage portion 62 is defined in the container body 52 by the inner peripheral surface of the container body and the lid body 60. Then, by removing the lid 60, the canister 54 can be taken in and out of the storage portion 62. The canister 54 is placed on a plurality of ribs formed on the bottom surface of the storage portion 62, and is disposed coaxially with the container body 52. A cylindrical liner 70 made of a metal such as carbon steel is provided on the inner peripheral surface of the container body 52. The canister 54 is stored in the storage unit 62 with a predetermined gap between the outer peripheral surface of the canister 54 and the inner peripheral surface of the container main body 52.

  A cooling air flow path 64 through which cooling air flows is formed by the gap between the outer peripheral surface of the canister 54 and the inner peripheral surface of the container body 52. The cooling air flow path 64 is formed over the entire outer circumference of the canister 54 and over the entire axial length of the outer circumference.

  A plurality of, for example, four intake ports 66 are formed at the bottom of the container body 52, and similarly, four exhaust ports 68 are formed at the upper end of the container body 52, and each communicates with the cooling air flow path 64. is doing. The four air inlets 66 are provided at regular intervals along the circumferential direction of the container body 52, and open to the bottom outer peripheral surface of the container body 52. Further, the exhaust ports 68 are provided at equal intervals along the circumferential direction of the container main body 52, and open to the outer peripheral surface of the upper end portion of the container main body 52.

  The intake port 66, the exhaust port 68, and the cooling air channel 64 constitute a heat removal unit that removes heat from the concrete cask 50 by natural circulation cooling of air. That is, the outside air as the cooling air introduced into the container main body 52 from the intake port 66 flows around the canister 54 through the cooling air flow path 64, while removing the canister 54 and the container main body 52 and cooling them. Then, the cooling air heated and heated by the heat from the canister 54 is discharged from the exhaust port 68 to the outside of the container main body 52.

  Further, a plurality of leg portions 55 project from the bottom of the container body 52, and a pallet mounting portion 74 into which an air pallet 72 (to be described later) can be inserted and mounted is formed between these leg portions.

  The refilling operation of the canister 54 with respect to the concrete cask 50 configured as described above is performed by the following process using the refilling device 36. That is, as shown in FIG. 1, the refilling device 36 installed in the carry-in / out area 14 includes a container placement portion 94 for placing the concrete cask 50 and the transport cask 31 side by side, and a container placement portion. And a gripping mechanism 96 that grips and conveys the canister.

  The transport cask 31 and the empty concrete cask 50 transported by a trailer or the like are placed side by side on the container placing portion 94. The transport cask 31 houses a canister 54 in which spent fuel is sealed in a nuclear power plant or the like. The gripping mechanism 96 pulls out and holds the canister 54 from the transport cask 31 and then moves it onto the concrete cask 50 to load the canister into the concrete cask storage 52. Thereafter, by closing the lid 60 of the concrete cask 50, the loading of the canister 54 is completed.

  When carrying out the canister 54 that has been stored for a predetermined period, the canister 54 is taken out of the concrete cask 50 by the refilling device 36 and loaded into the transport cask 31 by the reverse process. The transport cask 31 is transported to a reprocessing facility by a trailer or the like.

  Next, the metal cask will be described. As shown in FIG. 5 and FIG. 6A, in the present embodiment, the metal cask 80 is configured as a metal cask that is used for both transportation and storage. That is, the metal cask 80 is disposed substantially coaxially with the container main body 82 with a gap outside the container main body 82 formed of a metal such as stainless steel or carbon steel, and on the outer surface of the cask. And a resin layer 84 provided between the container main body 82 and the outer cylinder 83. The resin layer 84 is formed of, for example, a polymer material containing hydrogen and functions as a neutron shield.

  The lower end opening of the container body 82 is closed by a bottom plate welded to the lower end of the container body. Further, the upper end opening of the container body 82 is closed by a primary lid (not shown) and a secondary lid 85 disposed so as to overlap the primary lid. The primary lid and the secondary lid 85 are made of a metal such as stainless steel or carbon steel.

  A large number of spent fuel assemblies 87 are accommodated in the container body 82 configured as described above while being supported by the basket 86. The basket 86 is made of a composite material of boron (B) and aluminum. The container body 82 is filled with helium gas in a negative pressure state.

  When transporting the metal cask 80 having the above-described configuration, shock absorbers (not shown) are attached to the upper end portion and the lower end portion of the container main body 82 to absorb the impact during transport. However, at the time of storage, the pair of shock absorbers is removed from the container main body 82, and instead, a pallet 88 functioning as a frame is detachably attached to the lower end portion of the container main body 82.

  More specifically, as shown in FIGS. 5 and 6, the pallet 88 is formed in a square shape having sides substantially equal to the outer diameter of the outer cylinder 83, and at four places thereof, for example, at the center of each side. These are attached to the bottom surface of the container main body 82 by stoppers 89 and are located concentrically with the container main body.

  At the center and both side edges of the bottom surface of the pallet 88, elongated leg portions 90 extending in parallel with each other are integrally formed. A pallet mounting portion 92 that is open on the bottom surface side and can be mounted with an air pallet 72 described later is formed by a gap between the leg portions 90.

In the case of the metal cask 80 for transportation and storage configured as described above, after being transported from a nuclear power plant or the like, it is stored as it is without replacing the spent fuel inside. However, as described above, the shock absorber is removed and the pallet 88 is attached before storage.
In addition, as a metal cask, you may use the metal cask only for storage not only for a thing used also for transportation and storage.

  On the other hand, the present storage system includes a transport vehicle 100 that can freely travel in the carry-in / out area 14 and the storage area 16 as a container transport device that selectively transports the concrete cask 50 or the metal cask 80 in the storage building 10. ing.

  As shown in FIGS. 7 and 8, the transport vehicle 100 includes a cart 102 that can travel in the storage building 10 and on the road. The cart has four wheels 104 and a motor (not shown) that drives these wheels. Or an engine etc. are provided. Further, an air compressor 112 that functions as an air supply unit is provided in the carriage 102. The carriage 102 has a driver's seat 106 or an operation pendant switch (not shown), and can be driven manually by an operator. The carriage 102 is covered with a shielding material in order to prevent the operator from being exposed.

  A pair of air pallets 72 that can be inserted into the pallet mounting portion 74 of the concrete cask 50 or the pallet mounting portion 92 of the metal cask 80 are attached to the front end portion of the carriage 102 via the drive portion 108. These air pallets 72 are formed in an elongated rectangular shape and project forward from the drive unit 108 along the floor surface. Each air pallet 72 includes two circular air diaphragms 110 arranged side by side. These air diaphragms 110 are connected to an air compressor 112 provided in the carriage 102.

  The pair of air pallets 72 are moved by the drive unit 108 in the direction of approaching and separating from each other, the interval can be adjusted, and each can be driven up and down. Further, as will be described later, each air pallet 72 is disconnected from the drive unit 108 in a state where the air pallet 72 is mounted on the pallet mounting parts 74 and 92 of the concrete cask 50 or the metal cask 80, and at least has a degree of freedom in the vertical direction. It is configured to have.

  Further, the transport vehicle 100 includes a pair of gripping arms 114 extending forward from the drive unit 108, and these gripping arms grip the cask on which the air pallet 72 is mounted from both sides. Function.

  When the concrete cask 50 is transported by the transport vehicle 100 having the above-described configuration, the pair of air pallets 72 are inserted into the pallet mounting portion 74 of the concrete cask 50 by operating the carriage 102 as shown in FIGS. Place between the bottom of the cask and the floor. In this state, after the air pallets 72 are disconnected, air is supplied from the air compressor 112 to the air diaphragm 110. As a result, each air diaphragm 110 expands and air is exhausted from the numerous exhaust holes of the air diaphragm toward the floor surface. As a result, an air film is formed between each air diaphragm 110 and the floor surface, and the concrete cask 50 is held in a state of slightly floating from the floor surface.

  Further, the floating concrete cask 50 is gripped from both sides by the pair of gripping arms 114 to prevent lateral movement of the concrete cask during traveling. And the concrete cask 50 can be conveyed to arbitrary positions by making the trolley | bogie 102 drive | work in this state.

  After transporting to the predetermined position, the gripping of the concrete cask 50 by the gripping arm 114 is released, and further, the supply of air from the air compressor 112 is stopped and the concrete cask 50 is landed to place the concrete cask 50 in the predetermined position. can do. Subsequently, after each air pallet 72 is connected to the drive unit 108, the carriage 102 is retracted, and the air pallet 72 is pulled out from the pallet mounting part 74 of the concrete cask 50, thereby completing the conveying operation.

  When the metal cask 80 is transported by the transport vehicle 100, the same operation as described above is performed. However, in this case, after the distance between the pair of air pallets 72 is adjusted by the drive unit 108 according to the pallet mounting part 92 of the metal cask 80, these air pallets 72 are inserted and mounted on the pallet mounting part 94.

  In the above-described embodiment, a manual type driven by an operator is shown as the transport vehicle 100. However, as shown in FIG. 9, the transport vehicle may be configured as an automatic driving type or a remote control type. good. Such a transport vehicle 100 is the same as the transport vehicle described above except for the driver's seat, and includes a carriage 102 having wheels 104, an air compressor 112, a drive unit 108, a pair of air pallets 72, and a pair of gripping arms 114. It is prepared for.

  According to the storage system configured as described above, the concrete cask 50 or the metal cask 80 to be stored includes the pallet mounting portions 74 and 92 at the bottom thereof. Then, by mounting the air pallet 72 provided in the transport vehicle 100 traveling in the storage building 10 on the pallet mounting part 74 or 92 of an arbitrary cask, and transporting the cask in a state of being levitated by the air pallet, A heavy cask can be easily transported to any location. At this time, compared with a case where the cask is suspended and transported by an overhead crane or the like, there is no danger of dropping or the like, and the cask can be transported safely. Therefore, the concrete cask 50 or the metal cask 80 can be freely arranged and stored.

  Moreover, according to such a structure, it is not necessary to provide a large overhead crane in the ceiling part of the storage building 10, the floor height of a storage building can be made low, and the whole building can be reduced in size. Furthermore, by attaching the pallet 88 to the bottom of the metal cask 80, the bottom area of the metal cask increases, and the metal cask can be stably placed.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the pallet 88 attached to the metal cask includes the pallet mounting portion 92, and the pallet mounting portion is configured to transport the air pallet 72 of the transport vehicle 100. The pallet 88 itself may include an air pallet 72 attached to the pallet mounting portion 92. In this case, the transport vehicle 100 has a configuration in which the air pallet 72 is omitted. When the metal cask 80 is transported, the transport vehicle 100 connects the air compressor 112 to the air pallet 72 of the metal cask 80 and supplies air, and transports the metal cask while being gripped by the grip arm 114.
Even in such a configuration, the same operational effects as those of the above-described embodiment can be obtained.

The perspective view which shows the whole storage system which concerns on embodiment of this invention, and a part of storage building. The top view which fractures | ruptures and shows the said storage building partially. Sectional drawing of the said storage building along line AA and line BB of FIG. 2 , respectively. FIG. 3 is a perspective view showing a concrete cask used in the storage system, with a part thereof broken. The perspective view which cuts and shows the metal cask used for the said storage system partially. Sectional drawing of the said metal cask along each of the line CC and line DD of FIG. The perspective view which shows the conveyance vehicle in the said storage system. The perspective view which shows the state which conveys the said concrete cask with the said conveyance vehicle. The perspective view which shows the state which conveys the said metal cask with the conveyance vehicle which concerns on the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Storage building 14 ... Loading / unloading area 16 ... Storage area 36 ... Refilling device 40 ... Installation floor 50 ... Concrete cax 52 ... Container body 54 ... Canister 58 ... Spent fuel assembly 62 ... Storage part 72 ... Air pallet 74 ... Pallet mounting part 80 ... Metal cask 82 ... Container body 88 ... Pallet 92 ... Pallet mounting part 100 ... Conveying vehicle 102 ... Carriage 110 ... Air diaphragm 112 ... Air compressor

Claims (9)

In a storage system for storing storage containers containing radioactive materials,
A storage building having a loading / unloading area for loading and unloading a metal cask that is a storage container and a storage area for storing a large number of metal casks ,
The storage building is a one-story building with a lower floor height than the loading / unloading area without installing overhead cranes on both sides of the loading / unloading area extending across the central part in the longitudinal direction at right angles. The storage area is formed with
The metal cask has a square base having a larger plane area than the bottom of the metal cask and a pallet mounting portion on which an air pallet can be mounted, and the metal cask has a stand with the base fixed to the bottom. in setting conditions, transport, while being stored, travels the storage in the building, the air pallet mounted on the pallet mounting section you characterized in that it comprises a container conveying apparatus for conveying the metal cask savings Warehouse system. Cylindrical of the metal cask, the bottom of the radioactive substance metal container body which is encapsulated in the upright state in which the cradle is fixed by its periphery four stop, transport, characterized Rukoto stored savings warehouse system according to claim 1. In a storage system for storing storage containers containing radioactive materials,
A storage building having a loading / unloading area for loading and unloading storage containers and a storage area for storing a large number of storage containers;
The storage building is a one-story building with a lower floor height than the loading / unloading area without installing overhead cranes on both sides of the loading / unloading area extending across the central part in the longitudinal direction at right angles. The storage area is formed with
The storage container is a concrete cask, and has a concrete container main body that houses a sealed container in which a radioactive substance is enclosed, and the concrete container main body is provided with a pallet mounting portion that can be mounted with an air pallet at the bottom thereof .
A container transport device for transporting the concrete cask in an upright state by an air pallet mounted on the pallet mounting portion;
Savings built systems that characterized that you store the concrete cask in upright condition. The container transport apparatus includes a carriage traveling by automatically or manually, with attached to the carriage, a pallet mounting portion to be mounted air pallet of the storage vessel, feed air is supplied to the air diaphragm of the air pallet The storage system for a storage container according to any one of claims 1 to 3, further comprising an air part.   A refill device is provided in the carry-in / carry-out area and refills a sealed container filled with a radioactive substance between the transport container and the storage container that has been transported to the carry-in / carry-out area. The storage system for a storage container according to any one of claims 1 to 4. In the central part of the ceiling wall of the storage area, an exhaust tower having a large number of exhaust ports is extended along the long axis direction, and a large number of intake ports are provided at both side edges in the longitudinal direction of the ceiling wall. 4. A partition wall extending from the ceiling wall to the vicinity of the bottom wall is provided in the vicinity of the air inlet, and an inflow path following the air inlet is formed. The storage system described in . In the storage container used for the storage system according to claim 1 ,
A cylindrical container body capable of storing the radioactive substance;
A pedestal attached to the bottom of the container body and having a larger area than the bottom;
A pallet mounting portion formed on the gantry and capable of mounting an air pallet between the gantry and the installation surface;
A storage container comprising: A container transport device Ru using the storage system of claim 1 or 3,
A cart that runs automatically or manually,
Together are attached to the carriage, the cradle is fixed to the bottom surface of the metal cask, or, and the concrete cask bottom, air pallet mountable to the pallet mounting portion of,
An air supply section for supplying air to the plurality of air diaphragms of the air pallet;
A container conveying device comprising: The cart has a driver's seat on which an operator can ride, and the driver's seat is covered with a shielding material that shields radioactive materials in order to prevent the operator from being exposed to the bomb. Item 9. The container transport device according to Item 8 .

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