JP2001141891A - Concrete-made storage container, and storage room of the concrete-made storage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete-made storage container capable of strong radioactive materials safely, stably and for a long period and astorage room of the concrete-made storage container. SOLUTION: A nearly cylindrical container body 12 formed with concrete has a column shape container part 22, and in this container part, a canister 14 sealing radioactive material is contained. The air introduced through an intake piece 26 placed at the bottom of the container body flows through a cooling air path 24 located between the inner surface of the container part and the outer surface of the canister, removes heat generated out of the radioactive material and is exhausted out of the exhaust piece 28 placed in the upper part of the container body. In between the inner surface of the container body and the cooling air path, a metal-made linear 30 is placed. In between the inner surface of the container body and the liner, a buffer 32 is provided. The buffer shields neutron generated from the radioactive materials, has insulation effect and absorbs deformation due to thermal expansion of the liner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete storage container for storing and managing a radioactive substance that generates heat, a so-called concrete cask, and a storage for storing a plurality of concrete storage containers.

[0002]

2. Description of the Related Art Highly radioactive materials typified by spent fuel of a nuclear reactor are dismantled and reprocessed in order to collect useful materials such as plutonium which can be used again as fuel. These spent fuels are stored in a sealed state until reprocessing. As a method for storing such a highly radioactive substance, a wet method using a storage pool or the like, or a dry method using a cask or the like is known.

[0003] The dry method is a storage method in which air is naturally cooled instead of water, and has attracted attention because its operating cost is lower than that of the wet method, and is being developed. There are various types of casks used for the dry process, and concrete casks that shield spent fuel with a concrete structure have attracted special attention because of their low cost. Concrete is excellent as a neutron shielding material and also has advantages such as obtaining necessary strength as a structure.

[0004] Such a concrete cask has a cylindrical concrete container whose top and bottom are closed, and a cylindrical metal hermetic container in which spent fuel is sealed, a so-called canister, is housed and arranged in the concrete container. This shields radioactive materials from spent fuel. A cylindrical liner made of metal such as carbon steel is provided on the inner surface of the concrete container for the purpose of shielding radiation, promoting heat transfer, reinforcing the container, and the like.

[0005] In general, concrete itself has a low heat transfer characteristic, so that a concrete cask is provided with a heat removal structure for removing decay heat generated from spent fuel. That is, a gap that functions as a cooling air passage is formed between the inner peripheral surface of the concrete container and the outer surface of the canister, and an intake port is provided at the bottom of the concrete container, and an exhaust port is provided at the top of the container. Each is provided.
Then, the outside air as cooling air introduced into the concrete container from the intake port flows through the cooling air flow path and is naturally convected, and is discharged from the exhaust port, thereby removing heat from the canister and the concrete container to cool.

In the concrete cask constructed as described above, cooling of spent fuel is ensured by the above-mentioned heat removal structure, radiation shielding is ensured by the concrete layer, and sealing of spent fuel is ensured by the canister.

[0007]

SUMMARY OF THE INVENTION The concrete cask of the above construction is capable of safely supplying highly radioactive substances for a long period of time.
Moreover, it is necessary to stably store, and high radiation shielding performance is required for a long period of time.

However, concrete, which is a radioactive material shield, is easily affected by heat, and its strength is significantly reduced at high temperatures. The spent fuel stored in the concrete cask is at a high temperature, and if the concrete is locally heated and exceeds the limit temperature, the strength of the concrete is locally reduced, causing cracks and the like. And
When a crack or the like occurs in a concrete container, radiation leaks from that portion, making it difficult to ensure soundness. Therefore, improvement of the heat resistance of the concrete container,
In addition, the heat removal performance needs to be improved.

Further, when the concrete cask is overturned or receives a large impact due to collision of a falling object, there is a possibility that a crack or the like may occur in the concrete container or the concrete container may be broken. In this case as well, radiation leaks from the concrete cask,
It is difficult to ensure soundness. Therefore, it is necessary to improve the impact resistance of the concrete container and sufficiently increase the strength of the structure.

[0010] On the other hand, the concrete casks as described above are generally stored in a storage in a state of being arranged in large numbers. The wall of this storage is made of concrete, and the ceiling is provided with an inlet and an outlet. And the outside air introduced into the storage from the intake port,
It flows around the concrete cask and is discharged outside through the exhaust port. A part of the introduced outside air is introduced into the concrete container of the cask, and after cooling the canister and the concrete container, the air is exhausted into the storage.

In the above-described concrete cask, radioactive leakage increases around the intake and exhaust holes of the concrete container. Since the exhaust port provided in the upper part of the concrete container is located about 5 m above the floor of the storage,
Radiation from the exhaust holes has little effect.

However, since the air inlet provided in the lower part of the concrete container is located at a position of about 1 m from the floor of the storage, a worker who patrols and inspects in the storage crosses in front of the air inlet. there is a possibility.

Usually, in a storage, a plurality of concrete casks are arranged in series along the flow direction of cooling air. Therefore, the concrete cask located on the downstream side cools the concrete cask on the upstream side and sucks in the air whose temperature has increased, which may lower the cooling efficiency.

The present invention has been made in view of the above points, and has as its object to store a concrete storage container and a concrete storage container capable of safely and stably storing radioactive materials for a long period of time. To provide storage for

[0015]

In order to achieve the above object, a concrete storage container according to the present invention has a storage portion for storing a closed container in which a radioactive substance is sealed, and is formed of concrete. A substantially cylindrical container body, an intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and defined between the inner surface of the storage section and the outer surface of the closed container. A heat removal unit that has a cooling air flow path, removes heat generated from the radioactive material by flowing air introduced into the container body from the intake port to the cooling air flow path, and discharges the heat from the exhaust port. And a metal liner provided between the inner surface of the container main body and the cooling air flow path, and provided between the inner surface of the container main body and the liner to shield neutrons generated from the radioactive substance Do And a buffer material having thermal properties and absorbing deformation due to thermal expansion of the liner.

According to the above-mentioned concrete storage container, the heat transfer function from the closed container to the container main body is reduced by the heat insulating function of the cushioning material, and the rise in the temperature of the concrete constituting the container main body is suppressed. Further, when the liner is deformed so as to expand radially outward due to thermal expansion, the cushioning material is compressed and absorbs the deformation of the liner. Therefore, the tensile stress acting on the container body is reduced, and the occurrence of cracks in the container body can be prevented. In addition, since the neutrons generated from the radioactive material are shielded by the buffer material, the shielding performance of the entire concrete storage container is improved, and the concrete wall thickness of the container body can be reduced.

Another storage container made of concrete according to the present invention has a storage portion for storing a closed container in which a radioactive substance is sealed, and has a substantially cylindrical container body formed of concrete; An intake port provided at the bottom of the container, an exhaust port provided at the top of the container body, and a cooling air flow path defined between an inner surface of the storage portion and an outer surface of the closed container; Heat introduced from the mouth into the container body through the cooling air flow path to remove heat generated from the radioactive material, and a heat removal unit discharged from the exhaust port, and provided on the inner surface of the container body. A metal liner, a first metal dividing plate extending from the liner to the outer surface of the container body, and dividing the container body into a plurality of blocks along the axial direction, and from the liner to the outer surface of the container body. Extended, above Along the container body in the circumferential direction is a second divided plate made of metal which is divided into a plurality of blocks, comprising the.

When the liner suddenly expands thermally, a tensile stress acts on the concrete wall of the container body, and a through crack is easily generated in the container body. However, according to the concrete storage container, a through crack is easily generated. The first and second divided plates are previously arranged at the positions, and the concrete wall is divided into a plurality of blocks by these divided plates. Therefore, even if the liner suddenly expands thermally, only a gap is formed between the divided concrete block and the first or second divided plate, thereby preventing the occurrence of through cracks in other portions of the concrete wall. Can be. Also,
The first and second split plates also act as a heat bridge, releasing heat generated from the closed container to the outside of the container body,
It is possible to improve the heat removal efficiency.

Further, according to the concrete storage container of the present invention, each divided plate has a step, and the gap formed between the divided plate and the concrete block is shielded by the step of the divided plate. It does not penetrate to the outer peripheral surface of the container body. Therefore, even when the gap is formed, radiation does not leak, and the container body can stably maintain the shielding performance.

According to another concrete storage container according to the present invention, the container main body and the substantially cylindrical outer container are coaxially arranged with a gap in the outer container to define the storage portion. And a cylindrical inner container, and is configured in a double structure, wherein the liner is provided on an inner surface of the inner container.

According to the concrete storage container having the above structure, even if the liner is rapidly heated by the heat from the closed container and thermally expanded to cause a penetration crack in the inner container,
The outer container is kept healthy without cracks.
Therefore, radiation leakage can be prevented, and the shielding performance can be stably maintained. Further, by using the gap between the closed container and the inner container and the gap between the outer container and the inner container as the cooling air flow path, the heat removal efficiency is improved, and the heat resistance can be increased.

Still another concrete storage container according to the present invention comprises a metal inner liner provided on the inner surface of the container body, a metal outer liner provided on the outer surface of the container body, and the inner liner. And a plurality of metal ventilation pipes connecting the cooling air flow passage with the outside of the container body.

According to the present invention, there is provided a concrete storage container storing a closed container in which a radioactive substance is sealed, wherein a lower end is closed by a bottom wall and a storage portion for storing the closed container is provided in the storage container. A substantially cylindrical container body formed by the above, a lid closing the upper end opening of the container body, an intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and It has a cooling air flow path defined between the inner surface of the storage section and the outer surface of the closed container, and the air introduced into the container main body from the intake port flows into the cooling air flow path from the radioactive substance. A heat removal unit that removes generated heat and discharges from the exhaust port, and a bottom plate having a recess in which a lower end of the closed container is fitted, and a metal plate provided on an inner surface of the container body With the inner liner, An outer liner made of metal provided on the outer surface of the container main body, and inserted into a gap between the inner surface of the container main body and the lid and the upper part of the closed container to displace the closed container with respect to the container main body and the lid. And a regulated spacer.

According to the concrete storage container of the present invention, a hollow upper buffer provided on the lid and a hollow lower buffer provided below a bottom wall of the container body; Is further provided.

As described above, by covering the inner surface and the outer surface of the container body with the liner, the strength of the container body is improved,
In particular, buckling of the container body when a large impact is received from above can be prevented, and the impact resistance can be improved. At the same time, when the container body falls and breaks, the outer liner prevents the concrete from scattering. Further, by providing the liner with the bottom plate, it is possible to prevent the bottom wall of the container main body from being damaged when receiving a large impact from above, and to improve the impact resistance.

Further, even when the liner is rapidly heated by the heat from the closed container and thermally expanded, and a crack is generated on the concrete peripheral wall of the container body, the outer liner can prevent the radiation from leaking and stabilize the shielding performance. Can be maintained.

On the other hand, the lower end of the hermetically sealed container is fitted into a recess provided in the bottom plate of the liner, and the gap between the inner surface of the container body and the lid and the upper end of the hermetically sealed container is filled with a spacer so that the hermetically sealed container is filled. Prevents rattling of containers. Therefore, even when the concrete storage container receives a large shock, or vibrates or falls due to an earthquake or the like, the closed container does not collide with the inner surface of the container or the bottom surface of the lid. The container can be prevented from being damaged. This improves the impact resistance of the concrete storage container.

By providing an upper buffer and a lower buffer at the upper and lower portions of the container body, respectively, the impact of a falling object is absorbed, and the damage and destruction of the concrete storage container and the internal closed container are prevented. It becomes possible.

Further, according to the concrete storage container of the present invention, the intake passage and the exhaust passage are formed such that the cross-sectional area gradually increases from the inner surface side to the outer surface side of the container main body, whereby the pressure of the cooling air is increased. The loss is reduced, the flow efficiency of the cooling air is improved, and the heat removal efficiency of the container body and the closed container is improved.

According to the concrete storage container of the present invention, by providing a plurality of radiating fins extending along the cooling air flow path, the amount of heat removal is increased, and the heat removal efficiency of the container body and the closed container is improved. I'm trying.

The concrete storage container storage according to the present invention includes a plurality of installation floors on which the plurality of concrete storage containers are mounted, and a ceiling wall provided with a large number of intake ports and exhaust ports. Concrete wall, and an intermediate floor, which is disposed opposite to the installation floor with a predetermined gap therebetween and is capable of walking by a person, wherein the intermediate floor is provided on the container body of each concrete storage container. The concrete storage container is provided at a position higher than the hole and separated from the exhaust hole of the container body, and the concrete storage containers are arranged so as to pass through the intermediate floor.

Further, in the storage of the concrete storage container, a flow space through which the cooling air introduced from the intake port flows is defined between the installation floor and the intermediate floor, and the flow space is defined by the intake port. One end portion located on the side and forming an inflow port, and the other end portion closed and located on the exhaust port side,
It is characterized by having.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete cask according to a first embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a concrete cask 10 as a storage container made of concrete includes a container body 12 made of concrete and functioning as a shielding structure.
The canister 14 is housed in the container body. The canister 14 has a cylindrical metal sealed container 15 having both ends closed, and inside the metal sealed container,
A plurality of spent fuel assemblies 18 are sealed while being supported by the basket 16. These spent fuel assemblies 18 are, for example, spent fuel of a nuclear reactor, and contain radioactive substances that generate heat due to decay heat and generate radiation. The metal sealed container 15 has a welded sealed structure so that the enclosed radioactive substance does not leak outside.

The container body 12 of the concrete cask 10
As shown in FIGS. 1 to 3, has a closed bottom cylindrical shape and is formed to have a height of about 6 m and a diameter of about 4 m, for example, and a concrete wall thickness of about 0.9 m It is formed to the extent. The upper end opening of the container body 12 is closed by a concrete lid 20 whose outer surface is covered with a carbon steel plate. The lid 20 is provided with a plurality of bolts 21
Is bolted to the upper end of the container body 12. In addition, the inside of the concrete wall of the container main body 12 is provided with reinforcing bars (not shown).

A cylindrical storage portion 22 is defined in the container body 12 by the inner peripheral surface of the container body and the lid 20. The canister 14 is housed in the housing 22. That is, the canister 14 is
It is placed on a plurality of ribs 29 formed on the bottom surface of the container 2 and is coaxially arranged with the container body 12.
The canister 14 is housed in the canister 22 in the housing 22 with a predetermined gap, for example, a gap of about 10 cm, between the outer peripheral surface and the inner peripheral surface of the container body 12.

The gap between the outer peripheral surface of the canister 14 and the inner peripheral surface of the container body 12 forms a cooling air passage 24 through which cooling air flows. The cooling air passage 24 extends over the entire outer peripheral surface of the canister 14,
Further, it is formed over the entire axial length of the outer peripheral surface.

A plurality of, for example, four intake ports 26 are formed at the bottom of the container body 12, and four exhaust ports 28 are similarly formed at the upper end of the container body 12. 24. Four inlets 26
Are provided at regular intervals along the circumferential direction of the container body 12 and open to the outer peripheral surface at the bottom of the container body 12. The exhaust ports 28 are provided at equal intervals along the circumferential direction of the container body 12 and open to the outer peripheral surface of the upper end of the container body 12. In addition, these exhaust ports 28
Is defined by the upper edge of the container body 12 and the lid 20.

The intake port 26, the exhaust port 28, and the cooling air passage 24 constitute a heat removal section of the concrete cask 10. That is, the outside air as the cooling air introduced into the container body 12 from the intake port 26 flows around the canister 14 through the cooling air flow path 24, and during that time, removes heat and cools the canister 14 and the container body 12. Then, the cooling air heated and heated by the heat from the canister 14 is discharged from the exhaust port 28 to the outside of the container body 12.

On the other hand, a cylindrical liner 30 made of a metal such as carbon steel is provided on the inner peripheral surface of the container body 12, and furthermore, between the liner 30 and the inner peripheral surface of the container body 12, A cylindrical cushioning material 32 is provided. The liner 30 made of metal has a higher heat conductivity than concrete, promotes the transfer of heat generated from the spent fuel assembly 18, and emits radiation, mainly γ-rays, from the spent fuel assembly 18. It has the function of shielding.

As shown in FIGS. 2 and 3, the cushioning material 32 is held on the outer peripheral surface of the liner 30 by a plurality of studs 34 embedded in the lower part of the outer peripheral surface of the liner 30. That is, here, the stud 34 is
About two to three steps are provided apart from each other in the axial direction from the lower end of the zero. These studs 34 are
2 extends to the concrete wall of the container body 12 and fixes the lower end of the liner 30 to the container body 12.

The buffer material 32 is formed of a synthetic resin containing a large amount of hydrogen, for example, polyurethane foam, glass wool, polycarbonate or the like to a thickness of about 10 to 50 mm, and has a heat insulating function, a radiation function, particularly a neutron shielding function, and a buffer function. have.

That is, by the heat insulating function of the cushioning material 32,
The amount of heat transmitted from the canister 14 to the container body 12 is reduced, the temperature rise of the concrete forming the container body 12 is reduced, and the concrete can be maintained at the control temperature of 100 ° C. As a result, it is possible to prevent the occurrence of cracks and the like due to local heating of the concrete. Further, by shielding the neutrons generated from the spent fuel assemblies 18 by the shielding function of the cushioning material 32, the shielding performance of the entire concrete cask 10 is improved, and the concrete wall thickness of the container body 12 can be reduced. .

Furthermore, even when the liner 30 expands due to heat, the cushioning member 32 can prevent the container body 12 from being damaged or broken. That is, when the liner 30 is deformed so as to expand radially outward due to thermal expansion, the cushioning material 32 is compressed accordingly and absorbs the deformation of the liner. Therefore, the tensile stress acting on the container main body 12 is reduced, and the occurrence of cracks and the like in the container main body can be prevented.

Since the liner 30 and the cushioning member 32 can be displaced with respect to the inner surface of the container body 12 except for the lower end portion fixed by the stud 34, the liner 30 is deformed in the axial direction by thermal expansion. In the case, the container body 12
Are relatively displaced in the axial direction along the inner peripheral surface of. Therefore, the tensile stress acting on the container body 12 due to the thermal expansion of the liner 30 is reduced, and the occurrence of cracks and the like in the container body can be prevented. Accordingly, it is possible to prevent radiation leakage due to cracks and the like, and to stably maintain the radiation shielding performance of the concrete cask 10.

As described above, according to the first embodiment, the cushioning material 32 having the heat insulating function, the neutron shielding function, and the buffering function is provided on the inner peripheral surface of the container body 12 and the liner 30.
By improving the heat resistance and the heat removal performance, the occurrence of cracks and the like on the concrete wall of the container body 12 can be prevented, and the radioactive substance can be safely and stably maintained for a long period of time. And a storable concrete cask can be provided.

Next, a concrete cask according to another embodiment of the present invention will be described. In the other embodiments described below, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and different parts will be described in detail. .

As shown in FIGS. 4 and 5, according to the concrete cask 10 according to the second embodiment of the present invention, the peripheral wall portion of the container body 12 made of concrete is divided into a plurality of blocks. A dividing plate made of a metal such as carbon steel is embedded in a boundary between adjacent blocks.

That is, three annular first split plates 40 are fixed to the outer peripheral surface of the liner 30 provided on the inner peripheral surface of the container body 12 by welding, and are separated from each other in the axial direction of the liner. Is located. Each split plate 40 is provided in a plane orthogonal to the axis of the liner 30, and its outer peripheral edge extends to the outer peripheral surface of the container body 12. Each split plate 40 has a step portion 41 bent in the axial direction of the liner 30 at a radially intermediate portion thereof.
Reference numeral 1 extends over the entire length of the dividing plate 40 in the circumferential direction.

Further, on the outer peripheral surface of the liner 30, six rectangular plate-like second divided plates 42 are fixed by welding, and each extends along the axial direction of the liner. The six second dividing plates 42 are equally spaced from each other along the circumferential direction of the liner 30 and the container body 12 is separated from the outer peripheral surface of the liner.
Radially extending up to the outer peripheral surface of. And each second
The dividing plate 42 is provided so as to cross the three first dividing plates 40 and is welded to each other. Further, each of the second divided plates 42 has a step 43 at an intermediate portion in a radial direction thereof, which is bent along the circumferential direction of the liner 30.
Extends over the entire length of the second divided plate 42 in the axial direction.

Each of the first and second split plates 40 and 42 has a number of concrete casting holes 44 formed therein.
Then, the container body 12 includes the first and second divided plates 40,
42 is formed by pouring concrete with the welded liner 30 in a mold (not shown). Thus, the peripheral wall portion of the molded container body 12 is divided into four blocks along the axial direction by the three first dividing plates 40, and each block is further divided into six second blocks. It is divided into six blocks along the circumferential direction by the dividing plate 42.

According to the concrete cask according to the second embodiment configured as described above, the canister 14
Even when the liner 30 is rapidly heated by the heat from the tube and thermally expanded, it is possible to prevent the occurrence of cracks in the concrete wall of the container body 12 and to stably maintain the shielding performance.

That is, when the liner 30 is rapidly thermally expanded in the axial direction, a tensile stress is applied to the concrete wall of the container body 12 in the axial direction, and the concrete wall extends along a plane perpendicular to the axis of the liner. Through cracks are likely to occur. Also,
When the liner 30 is rapidly thermally expanded along its radial direction, a tensile stress is exerted on the concrete wall of the container body 12 along the radial direction, and a through crack is generated in the radial direction parallel to the axis of the liner. easy.

However, according to the second embodiment, the first and second dividing plates 40 and 42 are arranged in advance at positions where cracks are likely to occur as described above, and the concrete walls are formed by these dividing plates. Is divided into a plurality of blocks. Therefore, when the liner 30 rapidly expands thermally and a tensile stress acts on the concrete wall of the container body 12,
Only by forming a gap between the divided concrete block and the first or second divided plate 40, 42, it is possible to prevent the occurrence of through cracks in other portions of the concrete wall. At the same time, since each of the split plates 40 and 42 has the step portions 41 and 43, the gap formed between the split plate and the concrete block is blocked by the step portion of the split plate, It does not penetrate to the outer peripheral surface. Therefore, even when the gap is formed, the radiation can be prevented from leaking, and the container body 12 can stably maintain the shielding performance.

Further, the first and second split plates 40, 42
Extends from the liner 30 to the outer peripheral surface of the container body 12 so that it acts as a heat bridge and the canister 14
Can be released to the outside of the container body 12. Thereby, the cooling efficiency of the concrete cask 10 is improved, and the heat resistance can be increased.

As shown in FIGS. 6 and 7, according to the concrete cask 10 according to the third embodiment of the present invention, the container body 12 has the outer container 12a and the inner container 12b formed of concrete. It has a double structure.

That is, the outer container 12 a is formed in a cylindrical shape whose bottom is closed, and its upper opening is closed by the lid 20. The inner container 12b is formed in a cylindrical shape, and is coaxially arranged with a gap in the outer container 12a. A storage portion 22 is defined by the inner peripheral surface of the inner container 12b, the bottom wall of the outer container 12a, and the lid 20, and the canister 14 is stored in the storage portion.

A gap between the outer peripheral surface of the canister 14 and the inner peripheral surface of the inner container 12b forms a cooling air passage 24a through which cooling air flows. Further, a gap between the outer peripheral surface of the inner container 12b and the inner peripheral surface of the outer container 12a forms a cooling air passage 24b through which cooling air flows. These cooling air passages 24a and 24b communicate with an intake port 26 provided at the bottom of the container body 12 and an exhaust port 28 provided at the top of the container body.

A liner 30 is provided on the inner peripheral surface of the inner container 12b.
A cylindrical cushioning material 32 is provided between the inner peripheral surface and the inner peripheral surface. Note that the cushioning material 32 may be omitted.

According to the concrete cask 10 according to the third embodiment configured as described above, the container body 1
Since the liner 2 has a double structure, the liner 30 is rapidly heated by the heat from the canister 14 and thermally expands, and even if a penetrating crack occurs in the inner container 12b, the outer container 12a may crack. It is maintained without sound.
Therefore, leakage of radiation can be prevented, and shielding performance can be stably maintained.

Since the gap between the outer container 12a and the inner container 12b functions as the cooling air flow passage 24b, the heat removal efficiency of the concrete cask 10 is improved, and the heat resistance can be increased.

According to the concrete cask 10 according to the fourth embodiment of the present invention shown in FIG.
2, a liner 30 is provided on the inner peripheral surface, and the outer peripheral surface of the container body is covered with a cylindrical outer liner 46 made of metal such as carbon steel. The liner 30 is formed to have a thickness of, for example, about 40 mm, and the outer liner 46 is formed to have a thickness of about 10 mm.

The liner 3 is provided on the peripheral wall of the container body 12.
A plurality of ventilation pipes 48 are provided extending radially from zero to the outer liner 46. Each ventilation pipe 48 communicates with the cooling air flow path 24 and opens on the outer peripheral surface of the container body 12. Further, the plurality of ventilation pipes 48 are provided apart from each other in the axial direction and the circumferential direction of the container body 12. Furthermore, the middle part of each ventilation pipe 48 is
It has a stepped portion 48a bent in two axial directions.

According to the concrete cask 10 according to the third embodiment configured as described above, the container body 1
Since the liner 30 and the outer liner 46 are provided on the inner and outer peripheral surfaces of the container 2, the strength of the container body 12 is improved, and the impact resistance can be increased. Further, even when the liner 30 is rapidly heated and thermally expanded by the heat from the canister 14 and a crack occurs in the concrete peripheral wall of the container body 12, the outer liner 46 can prevent the radiation from leaking, and the shielding performance of the concrete cask 10 Can be stably maintained.

The provision of the outer liner 46 eliminates the need for a formwork during the manufacture of the concrete cask 10, eliminates the need for reinforcement in the concrete, and further reduces the vibration of the concrete cask 10 due to the overturning of the concrete cask 10. Even if the concrete is damaged, the scattering of the concrete can be prevented.

Further, the ventilation pipe 48 functions as a tie bar connecting the liner 30 and the outer liner 46, and can ventilate the inside of the container body 12 through the ventilation pipe 48, thereby improving the heat removal efficiency of the canister 14. it can.

The concrete cask 10 according to the fifth embodiment of the present invention shown in FIG. 9 is designed to improve the impact resistance, and when the concrete cask 10 receives a vibration due to an earthquake or the like or falls down. Of the canister 14 and the inner surface of the container body 12 to protect the canister and the container body.

That is, while the liner 30 is provided on the inner peripheral surface of the container body 12, the outer peripheral surface of the container body is
It is covered by a cylindrical outer liner 46 made of metal such as carbon steel. The inner liner 30 has a bottom plate 31 and covers the inner surface of the bottom wall of the container body 12.

As described above, by covering the outer periphery of the container main body 12 with the outer liner 46, the strength of the container main body is improved, and in particular, buckling of the container main body when a large impact is received from above is prevented, and Improves impact properties. At the same time, when the container body 12 falls down and is
This can prevent the concrete from scattering.
Further, by providing the liner 30 with the bottom plate 31, it is possible to prevent the bottom wall of the container body 12 from being damaged when a large impact is received from above, and to improve the impact resistance.

Further, even when the liner 30 is rapidly heated by the heat from the canister 14 and thermally expands, and a crack is generated in the concrete peripheral wall of the container body 12, the outer liner 46 can prevent the radiation from leaking. 10 can be stably maintained.

On the other hand, a circular recess 50 is formed on the inner surface of the bottom plate 31 of the liner 30, and the lower end of the canister 14 is fitted in the recess 50. Also, the canister 14
For example, four spacers 52 made of metal are provided between the upper end of the container body 12 and the upper part of the container body 12. Each spacer 52 has an L-shaped cross section, and is inserted between the outer peripheral surface of the upper portion of the canister 14 and the inner peripheral surface of the container body 12 and between the upper surface of the canister 14 and the inner surface of the lid 20.
As shown in FIGS. 9 and 10, the four spacers 52 are separated from each other along the circumferential direction of the container body 12 and are provided so as to avoid the exhaust port 28. Furthermore, canister 1
In the metal sealed container 15 of FIG.
A spacer 54 is inserted between the upper portion 8 and the upper plate of the metal sealed container to prevent the spent fuel assembly 18 from rattling.

As described above, by eliminating the backlash of the canister 14, even when the concrete cask 10 receives a large shock, or vibrates or falls due to an earthquake or the like, the canister 14 can keep the inner surface of the container body 12 or The container body and the canister can be prevented from being damaged by the collision without colliding with the bottom surface of the lid 20.
Thereby, the impact resistance of the concrete cask 10 can be further improved.

As shown in FIGS. 11 and 12, a concrete cask 10 according to a sixth embodiment of the present invention is provided.
According to the above, in order to further improve the impact resistance, in addition to the concrete cask 10 according to the fifth embodiment described above, a plurality of connecting plates 56 connecting the inner liner 30 and the outer liner 46 are provided. Is provided. These connecting plates 56
Is formed of a metal such as carbon steel and extends radially from the outer peripheral surface of the liner 30 to the inner peripheral surface of the outer liner 46.

A hollow upper cushion 58 made of concrete is integrally provided on the lid 20, and a hollow lower cushion 60 made of concrete is provided below the bottom wall of the container body 12. Have been. The upper buffer 58 and the lower buffer 60 are covered with a metal plate such as carbon steel.

By connecting the inner and outer liners 30 and 46 by the connecting plate 56 as described above, the container
2, the heat generated from the canister 14 can be guided to the outside of the container body 12 through the connecting plate 56, and the heat removal performance can be improved. In addition, the concrete cask 10
When a large shock is received, at least one of the upper buffer body 58 and the lower buffer body is broken to absorb the shock, and the container body 12 and the internal canister 14 are broken.
Damage can be prevented or reduced. Thereby, the impact resistance of the concrete cask 10 is improved, and the radioactive substance can be safely and stably stored for a long period of time.

As one method for improving the heat resistance of the concrete cask 10, it is effective to improve the heat removal efficiency of the container body 12 and the canister 14 by improving the flow efficiency of the cooling air.

Therefore, according to the concrete cask 10 according to the seventh embodiment shown in FIG. 13 and FIG.
The intake port 26 and the exhaust port 28 are formed so that the cross-sectional area gradually increases from the inner surface side to the outer surface side of the container body 12, and is formed, for example, in a bell mouth structure or a tapered shape. Thereby, the intake port 26 and the exhaust port 2
8, the pressure loss of the circulating air is reduced, the amount of natural ventilation flowing through the cooling air passage 24 can be increased, and as a result, the heat removal efficiency of the container body 12 and the canister 14 can be increased.

On the inner peripheral surface of the liner 30, a large number of radiating fins 6 extending over the entire length of the liner in the axial direction are provided.
2 are provided. These radiation fins 62 are equally spaced from each other along the circumferential direction of the liner 30 and extend radially. And the radiation fins 62
Is formed of a metal such as iron or stainless steel. In addition, a plurality of sets of the radiation fins 62 are connected to each other at the ends by a reinforcing plate 64. These reinforcing plates 64 are formed in an arc shape, and face the outer peripheral surface of the canister 14 with a predetermined gap.

By providing the radiating fins 62 as described above, the heat transfer area is increased, and the amount of heat removed by natural ventilation is increased. As a result, the efficiency of heat removal can be improved. Further, when the concrete cask 10 vibrates due to an earthquake or the like, the vibration amplitude of the canister 14 with respect to the container main body 12 is reduced, so that collision between the canister 14 and the inner peripheral surface of the container main body 12 can be prevented. As a result, damage to the canister 14 and the container body 12 can be prevented. On this occasion,
The reinforcing plate 64 reduces the collapse of the heat radiation fins 62, and can further reduce the collision between the canister 14 and the inner peripheral surface of the container body 12.

As described above, according to the concrete cask 10 according to the seventh embodiment, the heat removal efficiency can be improved by increasing the heat removal efficiency of the container body 12 and the canister 14, and as a result, the length can be improved. Radioactive material can be stored stably over a period of time.

The cooling air passage 24 in the container body 12
The temperature of the air flowing through increases as it goes upward. for that reason,
As in the eighth embodiment shown in FIG.
By providing 2 in the upper half area of the liner 30, at least in the area of 1/4 of the entire length from the upper end of the liner, the heat removal efficiency can be improved.

Alternatively, as shown in FIG. 16A, in the lower half of the liner 30, the number of the radiation fins 62 is reduced to reduce the arrangement density, and as shown in FIG.
The number of the radiating fins 62 may be increased in the upper half of 0 and the arrangement density may be higher than in the lower half.

Further, the radiation fins 62 may be provided not only on the inner peripheral surface of the liner 30 but also on the outer peripheral surface of the canister 14 as shown in FIGS. 17 and 18. In this case, the same as above. The operation and effect of the present invention can be obtained.

Further, in the above-described embodiment, the intake port 26 and the exhaust port 28 are configured to open to the outer peripheral surface of the container body 12, respectively. However, as shown in FIG. The exhaust port 28 may be opened on the bottom surface of the main body 12 and on the upper surface of the container main body 12, respectively. In this case, the pressure loss of the circulating air at the intake port 26 and the exhaust port 28 is reduced, and the amount of natural ventilation flowing through the cooling air passage 24 can be increased. As a result, the heat removal efficiency of the container body 12 and the canister 14 can be improved. Can be raised.

Next, a cask storage for storing any of the concrete casks 10 configured as described above will be described. As shown in FIGS. 20 to 22, the cask storage 70 is entirely formed of a concrete wall, and includes a cask installation floor 72 as a bottom wall, a ceiling wall 74, and a plurality of side walls 76.

The ceiling wall 74 has a large number of intake ports 8 each.
Two inlet towers 82 with zero and a number of outlets 84
Are formed, and the intake tower 82 is provided at both ends of the ceiling wall, and the exhaust tower 85 is provided at the center of the ceiling wall. A partition 86 extending from the ceiling wall 74 to the vicinity of the bottom wall 72 is provided near each of the intake towers 82, and forms an inflow passage 88 following the intake port.

In the cask storage 70, a number of concrete casks 10 are arranged at predetermined intervals on the cask installation floor 72. In addition, the cask storage 70 includes an intermediate floor 90 that is arranged in parallel on the cask installation floor 72 with a predetermined gap therebetween.
The intermediate floor 90 is provided over almost the entire surface between the intake tower 82 and the exhaust tower 85, and is located at a position slightly higher than the intake port 26 of each concrete cask 10, and is sufficiently Are provided at a distance from each other. A large number of circular through-holes 91 are formed in the intermediate floor 90, and each concrete cask 10 is inserted through the through-holes 91 without any gap, and passes through the intermediate floor 90 so that the cask installation floor 7 is formed.
2 above.

Then, the cask installation floor 72 and the intermediate floor 90
A flow space 92 through which the outside air introduced through the intake port 80 and the inflow passage 88 flows is defined between the first and second air passages. The end 90a of the circulation space 92 on the side of the intake tower 82 is open, defining an inlet 94, and the end 90b of the side of the exhaust tower 85.
Is closed by bending the intermediate floor 90 at right angles to the cask installation floor 72 side. Also, at the inflow port 94,
A plurality of louvers 96 are provided. The intermediate floor 90
Is formed by a metal plate such as a carbon steel plate,
When inspecting the concrete cask 10 or the like, the worker can walk.

The cask storage 7 constructed as described above
According to 0, as indicated by the arrows in FIGS. 21 and 22,
The cooling air flowing into the cask storage 70 from the intake port 80 of the intake tower 82 flows downward through the inflow passage 88 and is guided to the vicinity of the cask installation floor 72. Then, a part of the introduced cooling air flows from the inflow port 94 through the louver 96 into the flow space 92 defined below the intermediate floor 90,
The remainder flows into the space above the intermediate floor 90.

The cooling air that has flowed into the circulation space 92 flows around the plurality of concrete casks 10 and is introduced into the container body 12 through the intake ports 26 of the concrete casks. The cooling air flows through the cooling air flow path 24 in the container body 12 and the canister 14 and the container body 12
After cooling, the air is exhausted from the exhaust port 28 into the cask storage 70.

The cooling air introduced into the space above the intermediate floor 90 flows around the concrete casks 10 to cool them and joins with the air exhausted from the exhaust holes 28 of each concrete cask 10. Is discharged from the cask storage 70 through the exhaust port 84.

The cask storage 7 constructed as described above
0, the intake holes 26 of each concrete cask 10
A walkable intermediate floor 90 is provided at a height below the floor, and a worker can walk on the intermediate floor 90 to inspect the concrete cask 10 or the like. Therefore, the worker does not walk across the intake hole 26 of each concrete cask 10 and can eliminate the risk of receiving radiation from around the intake port. Thereby, the safety of the worker can be improved.

Further, since the circulation space 92 defined below the intermediate floor 90 is separated from the upper space by the intermediate floor 90, the cooling air introduced into the circulation space 92 may be significantly heated. Instead, the air reaches the concrete cask 10 on the downstream side and is sucked into the container body 12. Therefore, the downstream concrete cask 10 provided in the cask storage 70 near the exhaust tower 84 also
The cooling can be performed efficiently without being affected by the temperature of the concrete cask 10 on the upstream side.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the container body 12 of a concrete storage container
The wall thickness of the concrete wall, the thickness of the liner, and the material and shape of each component can be variously modified as necessary.

[0095]

As described above in detail, according to the present invention, the radioactive substance can be safely and stably stored for a long period of time by improving the heat removal performance of the container body and raising the heat resistance. A possible concrete storage container can be provided. Further, according to the present invention, by improving the impact resistance of the container body, the radiation shielding performance is reliably maintained, and the concrete storage capable of safely and stably storing radioactive substances for a long period of time. A container can be provided. Further, according to the present invention, it is possible to provide a concrete storage container storage capable of efficiently cooling the storage container made of concrete and minimizing the influence of radiation on workers. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a concrete cask according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the concrete cask.

FIG. 3 is an enlarged sectional view showing a part of the concrete cask, and a sectional view taken along line AA in FIG. 2;

FIG. 4 is a longitudinal sectional view of a concrete cask according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB in FIG. 4;

FIG. 6 is a longitudinal sectional view of a concrete cask according to a third embodiment of the present invention.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a longitudinal sectional view of a concrete cask according to a fourth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a concrete cask according to a fifth embodiment of the present invention.

FIG. 10 is a plan view of the container main body in a state where a lid is removed in the concrete cask according to the fifth embodiment.

FIG. 11 is a longitudinal sectional view of a concrete cask according to a sixth embodiment of the present invention.

FIG. 12 is a sectional view taken along the line EE in FIG. 11;

FIG. 13 is a longitudinal sectional view of a concrete cask according to a seventh embodiment of the present invention.

FIG. 14 is a plan view of the container main body with the lid removed in the concrete cask according to the seventh embodiment, and a cross-sectional view taken along line FF of FIG. 13;

FIG. 15 is a longitudinal sectional view of a concrete cask according to an eighth embodiment of the present invention.

FIG. 16 is a sectional view of a concrete cask according to a ninth embodiment of the present invention.

FIG. 17 is a longitudinal sectional view of a concrete cask according to a tenth embodiment of the present invention.

FIG. 18 is a sectional view taken along the line GG in FIG. 17;

FIG. 19 is a longitudinal sectional view of a concrete cask according to an eleventh embodiment of the present invention.

FIG. 20 is a perspective view showing a storage space for the concrete cask according to the embodiment of the present invention.

FIG. 21 is a sectional view of the storage.

FIG. 22 is a plan view showing a state where the upper part of the storage is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Concrete cask 12 ... Container main body 12a ... Outer container 12b ... Inner container 14 ... Canister 18 ... Spent fuel assembly 20 ... Lid 22 ... Storage part 24 ... Cooling air flow path 26 ... Intake port 28 ... Exhaust port 30 ... Liner 31, bottom plate 32, cushioning material 40, first dividing plate 41, 43, stepped portion 42, second dividing plate 50, recess 52, spacer 58, upper buffer 60, lower buffer 62, radiation fin 70, cask Storage 72: Cask installation floor 74: Ceiling wall 80: Intake port 84: Exhaust port 90: Intermediate floor 92: Distribution space

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Asada 2-1-1 Shinama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. 1 Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Kenichi Matsunaga 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Kazuo Murakami, Hyogo, Kobe-shi, Hyogo 1-1-1, Wadazakicho, Ward Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Noboru Kimura 2-1-1, Shinhama, Araimachi, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd.Takasago Research Laboratory (72) Inventor Mitsuhiro Irino 2-1-1, Niihama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Takashi Irie Hyogo Prefecture Takasago Araichoshinhama 2 chome No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Research Institute

Claims (21)

[Claims] 1. A concrete storage container containing a sealed container in which a radioactive substance is sealed, comprising a storage portion in which the sealed container is stored, and a substantially cylindrical container body formed of concrete; An intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and a cooling air flow path defined between an inner surface of the storage portion and an outer surface of the closed container. Removing the heat generated from the radioactive material by flowing air introduced into the container main body from the intake port to the cooling air flow path, and a heat removal unit discharging from the exhaust port, and an inner surface of the container main body. A metal liner provided between the cooling air flow path, and a metal liner provided between the inner surface of the container body and the liner, and has a heat insulating property while shielding neutrons generated from the radioactive material, Above liner And a cushioning material that absorbs deformation due to thermal expansion of the concrete storage container. 2. The cushioning material is fixed to an outer surface of the liner and is provided so as to be relatively displaceable with respect to an inner surface of the container body in accordance with thermal expansion along an axial direction of the liner. The storage container made of concrete according to claim 1, characterized in that: 3. A concrete storage container containing a sealed container in which a radioactive substance is sealed, the container having a storage portion in which the sealed container is stored, and a substantially cylindrical container body made of concrete; An intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and a cooling air flow path defined between an inner surface of the storage portion and an outer surface of the closed container. Removing the heat generated from the radioactive material by flowing the air introduced into the container body from the intake port to the cooling air flow path, and removing the heat from the exhaust port, and the inner surface of the container body A metal liner provided, a first metal plate that extends from the liner to the outer surface of the container body and divides the container body into a plurality of blocks along the axial direction, and the container body from the liner of Extending to the surface, concrete storage container, characterized in that and a second divided plate made of metal which is divided into a plurality of blocks along the container body in the circumferential direction. 4. The container according to claim 1, wherein the first split plate has a step portion bent along an axial direction of the container body, and the second split plate is bent along a circumferential direction of the container body. The concrete storage container according to claim 3, further comprising a stepped portion. 5. A concrete storage container containing a sealed container in which a radioactive substance is sealed, the container having a storage portion in which the closed container is stored, and a substantially cylindrical container body made of concrete; An intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and a cooling air flow path defined between an inner surface of the storage portion and an outer surface of the closed container. Removing the heat generated from the radioactive material by flowing the air introduced into the container body from the intake port to the cooling air flow path, and removing the heat from the exhaust port, and the inner surface of the container body A metal liner provided, wherein the container body is a substantially cylindrical outer container, and a cylindrical inner container which is coaxially arranged with a gap in the outer container and defines the storage portion. And the liner is above A storage container made of concrete, which is provided on an inner surface of an inner container. 6. A cooling air flow path defined between an inner surface of the inner container and an outer surface of the closed container,
The concrete storage container according to claim 5, further comprising a second cooling air passage defined between an outer surface of the inner container and an inner surface of the outer container. 7. A concrete storage container containing a sealed container in which a radioactive substance is sealed, the container having a storage portion in which the sealed container is stored, and a substantially cylindrical container body made of concrete; An intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and a cooling air flow path defined between an inner surface of the storage portion and an outer surface of the closed container. Removing the heat generated from the radioactive material by flowing the air introduced into the container body from the intake port to the cooling air flow path, and removing the heat from the exhaust port, and the inner surface of the container body A metal inner liner provided, a metal outer liner provided on an outer surface of the container body, and a connection between the inner liner and the outer liner, and the cooling air flow path and the outside of the container body Communicate with Concrete storage container characterized by comprising a plurality of vent pipes made of metal. 8. Each of the vent pipes extends in a radial direction of the container main body and has a step portion bent along an axial direction of the container main body. 8. The concrete storage container according to 7. 9. A concrete storage container storing a closed container in which a radioactive substance is sealed, wherein a lower end is closed by a bottom wall, and a storage portion for storing the closed container is formed in the storage container. A substantially cylindrical container main body, a lid closing an upper end opening of the container main body, an intake port provided at a bottom portion of the container main body, an exhaust port provided at an upper portion of the container main body, and the storage section A cooling air flow path defined between the inner surface of the container and the outer surface of the closed container, and the air introduced into the container body from the intake port flows through the cooling air flow path and is generated from the radioactive material. A heat removal unit that removes heat and discharges the gas through the exhaust port; and a bottom plate having a recess in which the lower end of the closed container is fitted. Liner and the above container An outer liner made of metal provided on the outer surface of the body, and inserted into a gap between the inner surface of the container body and the lid and the upper part of the closed container to regulate the displacement of the closed container with respect to the container body and the lid. A concrete storage container, comprising: a spacer; 10. The concrete storage container according to claim 9, wherein a plurality of said spacers are provided avoiding said exhaust port. 11. The apparatus according to claim 11, further comprising a hollow upper buffer provided on said lid, and a hollow lower buffer provided below a bottom wall of said container body. Item 9
Or the concrete storage container according to 10. 12. A metal connecting plate extending radially from the inner liner to the outer liner and connecting the inner liner and the outer liner to each other. A storage container made of concrete according to the above item. 13. A concrete storage container containing a substantially cylindrical hermetic container enclosing a radioactive substance, the container having a storage portion for accommodating the hermetically sealed container therein, and having a substantially cylindrical shape made of concrete. A container body, an intake port provided at the bottom of the container body, an exhaust port provided at the top of the container body, and a cooling air flow defined between an inner surface of the storage portion and an outer surface of the closed container. A heat removal unit that has a path, removes heat generated from the radioactive substance by flowing air introduced into the container body from the intake port into the cooling air flow path, and discharges the heat from the exhaust port; A metal liner provided on the inner surface of the main body, and a plurality of metal liners provided on either the outer surface of the closed container or the inner surface of the liner and extending in the cooling air flow path along the axial direction of the closed container. Radiation fin A storage container made of concrete, comprising: 14. The concrete storage container according to claim 13, wherein each of said heat radiation fins is provided over a region along the entire axial length of said closed container. 15. The concrete storage container according to claim 13, wherein each of said heat radiation fins is provided over an upper half region of said closed container. 16. A heat radiation fin comprising: a plurality of upper heat radiation fins provided over an upper half region of the closed container;
A plurality of lower radiating fins provided over a lower half region of the closed container, wherein the upper radiating fins are provided more densely than the lower radiating fins along a circumferential direction of the closed container. The concrete storage container according to claim 13, wherein the storage container is made of a concrete. 17. A plurality of reinforcing plates respectively connecting the extending ends of a plurality of sets of the radiating fins of the radiating fins and facing the outer surface of the closed container with a predetermined gap therebetween. 13. The method according to claim 13, wherein
7. The concrete storage container according to any one of 6. 18. The container according to claim 13, wherein the intake port and the exhaust port are formed in such a shape that the sectional area gradually increases from the inner surface side to the outer surface side of the container body. The concrete storage container according to claim 1 or 2. 19. The container according to claim 13, wherein said intake port is open on the bottom and bottom outer peripheral surfaces of said container body, and said exhaust port is open on said top and upper peripheral surfaces of said container body. 19. The storage container made of concrete according to any one of items 18 to 18. 20. A storage for storing a concrete storage container according to any one of claims 1 to 19, wherein: an installation floor on which the plurality of concrete storage containers are mounted; A ceiling wall with an exhaust port,
A plurality of concrete walls, including: a plurality of concrete walls, and an intermediate floor that is disposed to face the installation floor with a predetermined gap therebetween and is capable of walking by humans. The concrete storage container is provided at a position higher than the intake hole and spaced apart from the exhaust hole of the container body, and each of the concrete storage containers is arranged so as to pass through the intermediate floor. Storage for plastic storage containers. 21. A flow space through which the cooling air introduced from the intake port flows is defined between the installation floor and the intermediate floor,
21. The air conditioner according to claim 20, wherein the circulation space has one end located on the intake port side and forming an inflow port, and the other end located on the exhaust port side and closed. Storage of the concrete storage container described.