JPH10170698A - Spent fuel dry storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit a long period of safe storage by enhancing the soundness of a fuel container during storage. SOLUTION: A spent-fuel dry storage facility 1 includes a storage chamber 2 having a fuel storage pipe 7 therein. The fuel storage pipe 7 encloses and stores a spent-fuel sealing container 6 therein. The storage chamber 2 is completely sealed, and a pipe 12 through which cooling air passes is installed inside the storage chamber 2 to remove heat from spent fuel 5. A device 14 for substituting gas therein is installed in the storage chamber 2 to substitute gas in the storage chamber 2 with rare gas or nitrogen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a facility for storing spent fuel generated from a nuclear power plant.

[0002]

2. Description of the Related Art Spent fuel assemblies generated from a nuclear power plant are stored in a storage pool in the nuclear power plant until they are reprocessed to recover nuclear fuel materials such as reusable uranium and plutonium. Is done. However, there is a demand for the construction of new storage facilities capable of storing spent fuel, which is increasing year by year, at low cost.

[0003] Spent fuel storage facilities corresponding to these objects include a spent fuel dry storage facility that stores a sealed container of spent fuel while cooling it with air flowing around the spent fuel container. Examples of this storage facility include the storage facilities described in Japanese Patent Publication No. 5-11598, Japanese Patent Laid-Open No. 2-17500, and Japanese Patent Laid-Open No. 61-162797.

[0004] In the spent fuel dry storage facility disclosed in Japanese Patent Publication No. 5-1598, a large number of cylindrical metal pipes (storage pipes) are installed in a storage room in a concrete building, and inside the storage pipes. One or more containers in which spent fuel is sealed are stacked and stored in the axial direction. Decay heat from spent fuel is
Cooling is performed by air flowing in a cooling air flow path formed between the storage room ceiling holding the storage tube upper end and the storage room floor holding the storage tube lower end. The air flowing in the cooling air flow path is the outside air taken in from the outside of the storage room by natural stimulation, and after flowing inside the storage room, is discharged to the outside of the storage room. Each storage pipe is connected to a pipe for sucking gas inside the storage pipe, and connected to a monitor device for detecting radiation to evaluate the soundness of the spent fuel and the spent fuel sealed container.

[0005] Similarly to Japanese Patent Publication No. 5-11598, a spent fuel dry storage facility disclosed in Japanese Patent Application Laid-Open No. 17500/1990 has a large number of cylindrical metal pipes (storage) in a storage room in a concrete building. A pipe) is installed, and one or a plurality of containers sealed with spent fuel are axially stacked and stored inside the storage pipe. Decay heat from the spent fuel is cooled by air flowing in a cooling air flow path formed between the storage room ceiling holding the storage tube upper end and the storage room floor holding the storage tube lower end. The air flowing in the cooling air flow path is the outside air taken in from the outside of the storage room by natural stimulation, and after flowing inside the storage room, is discharged to the outside of the storage room. Each storage pipe is connected to a pipe for sucking gas inside the storage pipe. By connecting a monitoring device for detecting radiation to this pipe, it is possible to evaluate the soundness of the spent fuel and the spent fuel sealed container.

[0006] In the spent fuel dry storage facility disclosed in Japanese Patent Application Laid-Open No. 61-162797, sealed containers for spent fuel are vertically set one by one in cylindrical supports arranged side by side in a storage chamber. Stored in posture. Decay heat from the spent fuel is cooled by air flowing through a cooling air flow path formed by the storage room floor and ceiling. Cooling air passages are connected to the upper and lower portions of the storage room, and the flow passages are connected to each other above the storage room to form a circulation passage of air including the storage room. Another cooling air flow path separated by a partition wall is formed further above the circulation flow path, and air is taken in from the outside of the storage facility and discharged to the outside through an exhaust pipe. A heat pipe for heat exchange is provided between the upper part of the cooling air circulation flow path and the cooling air flow path connected to the outside, and heat in the storage chamber is released to the outside through the heat pipe.

[0007]

Since the storage of spent fuel is for a long period of, for example, 50 years, the integrity of the spent fuel and its sealed container is maintained for a long time so that the radioactive material does not leak to the outside. Leakage to the outside must be minimized. For that purpose, it is necessary to reduce the change in the environment of the storage room, to remove oxygen and moisture as much as possible, and to store it in a space shielded from the outside.

However, in the spent fuel dry storage facility disclosed in Japanese Patent Publication No. 5-11598, cooling air is taken in from outside, and after cooling the fuel storage pipe, it is discharged to the outside as it is. For this reason, the fuel storage pipe comes into direct contact with the outside air, and even when stored for a long period of 50 years or more, it is affected by changes in humidity and temperature during the storage period.
Further, when the fuel storage tube is damaged during the storage period, there is a high risk that the radioactive substance is released to the outside as it is.

In the spent fuel dry storage facility disclosed in Japanese Patent Laid-Open No. 17500/1990, similarly to Japanese Patent Publication No. 5-11598, cooling air is taken in from the outside, and after cooling the fuel storage tube, the fuel storage pipe is directly cooled. Released to For this reason, the fuel storage pipe comes into direct contact with the outside air, and even when stored for a long period of 50 years or more, it is affected by changes in humidity and temperature during the storage period. In addition, when the fuel storage tube is damaged during the storage period, the risk that the radiation monitoring device is directly released to the outside is increased.

In the spent fuel dry storage facility disclosed in Japanese Patent Application Laid-Open No. 61-162797, the storage room has a sealed structure, and the gas in the storage room is shut off from the outside. The radioactive material leaked into the storage chamber is not released to the outside even if the fuel storage tube is damaged during the storage period. However, in order to remove the decay heat generated from the spent fuel, a heat pipe is installed at the top of the gas circulation path inside the storage chamber and the cooling path for further cooling the condensing part of the heat pipe. An air flow path is provided to release heat to the outside via a heat pipe. Therefore, it is necessary to periodically clean the outer surface of the heat pipe in order to improve the heat efficiency of the heat pipe, so complicated maintenance work is required, and the service life of the heat pipe itself is short, so replacement work is several years. Is required once. In addition, since it is necessary to provide two cooling air flow paths, the scale of the storage facility also increases.

An object of the present invention is to provide a spent fuel dry storage facility that can store safely for a long period of time by using a facility structure in which radioactive materials do not leak outside when storing spent fuel for a long period of time. Is to provide.

Another object of the present invention is to provide a spent fuel dry storage facility capable of keeping spent fuel and a spent fuel sealed container sound for a long period of time and safely storing them.

Another object of the present invention is to provide a spent fuel dry storage facility capable of efficiently removing decay heat generated from spent fuel.

Another object of the present invention is to reduce the amount of work for improving the soundness of a spent fuel and a sealed container for a spent fuel and monitoring the leakage of a radioactive substance in accordance with the amount of decay heat generated from the spent fuel. It is an object of the present invention to provide a spent fuel dry storage facility.

Another object of the present invention is to provide a spent fuel dry storage facility capable of storing spent fuel more safely for a long period of time.

[0016]

According to a first aspect of the present invention, a storage chamber for storing a spent fuel sealed container is shut off from the outside, and the inside of the storage chamber is penetrated from the outside of the storage chamber. Another object of the present invention is to provide a flow path through which a cooling medium that flows to the outside flows.

According to a second aspect of the present invention which achieves another object of the present invention, in addition to the features of the first aspect, the gas in the storage chamber is replaced with a rare gas, nitrogen or carbon dioxide. is there.

The features of the third aspect of the present invention which achieves another object of the present invention are, in addition to the features of the first or second aspect,
The use of air and water as the cooling medium.

According to a fourth aspect of the present invention, a pump for flowing a cooling medium through a flow path for flowing a cooling medium is provided in addition to the features of the first, second, or third aspect of the present invention. Is to provide.

A fifth aspect of the present invention which achieves the other object of the present invention is that, in addition to the features of the first, second, third or fourth aspect, the flow path for flowing the cooling medium is a metal pipe. , And a spent fuel sealed container is put on it and stored.

According to a sixth aspect of the present invention which achieves another object of the present invention, in addition to the features of the first, second, third, fourth or fifth aspect of the present invention, the wall, floor, and ceiling of the storage room are provided. The object is to cover the inside with a metal plate and form a sealed structure with the metal plate.

Another feature of the present invention that achieves another object of the present invention is that the inside of the wall, floor, and ceiling inside the storage room is covered with a metal plate, so that the connection portion between the storage room and the cooling air flow path is provided. The entire storage room can be sealed simply by closing the storage space.

The features of the invention of claim 8 which achieves another object of the present invention are as follows, in addition to the features of the invention of claim 6 or 7,
The object is to extend a plurality of metal parts outside the storage room through the storage room wall.

According to a ninth aspect of the present invention which achieves another object of the present invention, in addition to the features of the first, second, third, fourth, fifth, sixth or seventh aspect of the present invention, a spent fuel seal is provided. The container has a double-pipe structure.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) A spent fuel dry storage facility according to an embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. The spent fuel dry storage facility 1 of the present embodiment is a concrete building having a fuel storage room 2 and a fuel loading room 3 therein. The fuel loading chamber 3 is located above the fuel storage chamber 2.

A fuel transfer crane 4 is installed in the fuel loading chamber 3, and a fuel sealed container 6 in which the spent fuel 5 is sealed together with helium can be used as an optional fuel storage pipe 7 installed in the fuel storage chamber 2 and its fuel storage pipe 7. It can be moved above the lid 8. When storing the spent fuel, the fuel-tight container 6 is moved over the empty fuel storage pipe 7, the lid 8 is removed, and the fuel is inserted into the fuel storage pipe 7 in the fuel storage chamber 2, and the lid 8 is again closed. Return to and start storage.

A metal plate 9 is provided on the wall, floor, and ceiling surfaces of the fuel storage chamber 2 without any gap to completely seal the inside of the fuel storage chamber 2. Therefore, in the unlikely event that spent fuel 5
Even if the radioactive substance leaks into the fuel storage chamber 2 due to the breakage of the fuel container 6 and the fuel storage pipe 7, there is no possibility that the radioactive substance flows out of the storage facility 1. The fuel storage pipe 7 has a horizontal support rod 10 installed horizontally in the fuel storage chamber 2 and a vertical support rod 11 installed below the fuel storage pipe 7.
Is supported from below.

A pipe 12 through which cooling air flows is provided inside the fuel storage chamber 2. At one end, the pipe 12 through which air flows penetrates the wall from the lower part of the fuel storage chamber 2 and is connected to the outside.
One part extends horizontally near the floor to the wall on the opposite side of the fuel storage chamber 2 and then rises near the wall surface, and the other immediately rises near the wall surface and then rises near the wall. The vicinity of the ceiling is extended horizontally to the wall, and penetrates the wall from the upper portion of the fuel storage chamber 2 and is connected to the outside again. The cooling air flows in from the opening connected to the outside at the lower part of the fuel storage chamber 2 of the pipe 12, and is heated at the upper part of the fuel storage chamber 2 by the decay heat generated from the spent fuel 5 inside the fuel storage chamber 2. To the opening connected to the The opening is further connected to an exhaust tower 13 for cooling air, and the cooling air is discharged to the outside after rising inside the exhaust tower 13. As described above, the flow path of the cooling air passes from the lower part of the fuel storage chamber 2 to the upper part of the fuel storage chamber 2 through the inside of the fuel storage chamber 2 and further to the outside from the upper part through the exhaust tower 13. Due to the natural convection effect caused by the warming of the air and the lower density than the outside air, the cooling air naturally flows through the pipe 12 while taking away the decay heat generated from the spent fuel 5.

Since the inside of the fuel storage chamber 2 is sealed,
It is possible to replace the gas inside. Fuel storage room 2
Is provided with a device 14 for replacing the gas inside, and for example, it is assumed that the gas inside the fuel storage chamber 2 is replaced with nitrogen. Since the storage period of spent fuel can be as long as 50 years or more, the fuel storage pipe 7
Must be prevented from being damaged. Nitrogen has a very low reactivity compared to oxygen in the air, and thus is advantageous against damage of the fuel storage pipe 7 due to corrosion. Also, if the replacement is performed with sufficiently dried nitrogen, it is advantageous against corrosion due to moisture, and damage to the fuel storage tube can be significantly reduced.

Further, a radiation monitor 15 and a helium detector 16 are installed in the upper part of the fuel storage chamber 2, and the spent fuel 5, the used fuel sealed container 6, the fuel storage pipe 7 are damaged, and the If the radioactive material or the helium enclosed in the fuel-sealed container 6 leaks into the fuel storage chamber 2, it is detected and notified to a manager, and appropriate measures are taken.

(Embodiment 2) A dry fuel storage system according to another embodiment of the present invention will be described with reference to FIGS. 4, 5 and 6. FIG. This embodiment is suitable when the decay heat from the spent fuel is relatively large.

The spent fuel dry storage facility 1 shown in FIG.
Reference numeral 7 denotes a concrete building similar to the first embodiment, which has a fuel storage chamber 2 and a fuel loading chamber 3 therein, and the fuel loading chamber 3 is located above the fuel storage chamber 2. The structure of the fuel loading chamber 3 is the same as in the first embodiment.

A fuel transfer crane 4 is installed in the fuel loading chamber 3. As in the first embodiment, a fuel sealed container 18 in which the spent fuel 5 is sealed together with helium is placed in an arbitrary fuel storage position in the fuel storage chamber 2. 19 and its lid 8 can be moved above. When storing spent fuel, the fuel-tight container 6 is moved to an empty fuel storage position 19, the lid 8 is removed, and the fuel storage position 1 in the fuel storage chamber 2 is removed.
9 and the lid 8 is replaced again to start storage.

As in the first embodiment, a metal plate 9 is installed without any gap on the surface of the wall, floor and ceiling inside the fuel storage chamber 2 to completely seal the inside of the fuel storage chamber 2. Therefore, even if the spent fuel 5 or the sealed fuel container 18 is damaged and the radioactive substance leaks into the fuel storage chamber 2, there is no possibility that the radioactive substance flows out of the storage facility 1.

A pipe 2 for flowing cooling water is provided inside the fuel storage chamber 2.
0 is installed similarly to the pipe 12 for flowing the cooling air of the first embodiment. The pipe 20 through which water flows is connected at one end to a cooling water supply device 21 installed outside the fuel storage chamber 2, from which cooling water is sent to the pipe 20. The pipe 20 for sending the cooling water enters the fuel storage chamber 2 from above the fuel storage chamber 2. A part of the pipe 20 extends horizontally near the ceiling of the fuel storage chamber 2 as it is, and is connected to the outside of the fuel storage chamber 2 from the opposite wall. After the remaining pipes 20 extend downward near the wall, the pipes 20 extend to a slightly higher position on the floor and extend horizontally to the opposite wall, and are connected to the outside. The pipe 20 extended to the outside is connected to a cooling water pump 22 installed outside the fuel storage chamber 2, and also serves to flow the cooling water in the pipe 20.

A pipe 20 for cooling water which is horizontally installed near the floor in the fuel storage chamber 2 has a rectangular shape, and the fuel-tight container 18 is placed on the pipe 20 for storage. A vertical support rod 11 is provided beside the fuel sealed container 18 from the floor to the ceiling of the fuel storage chamber 2 to prevent the fuel sealed container 18 from falling down. Since the sealed fuel container 18 is placed in contact with the pipe 20 through which the cooling water flows, most of the decay heat generated from the spent fuel 5 is transferred to the metal sealed fuel container 18 and the pipe 2.
0 is transmitted by conduction heat transfer to the cooling water. for that reason,
Decay heat can be efficiently removed to the outside of the fuel storage chamber 2.

As in the first embodiment, since the inside of the fuel storage chamber 2 is sealed, the gas inside can be replaced. The fuel storage chamber 2 has a device 14 for replacing gas therein.
Is installed, for example, helium replaces the gas inside the fuel storage chamber 2. Helium, like nitrogen, has much lower reactivity than oxygen in the air, so that damage to the sealed fuel container 18 due to corrosion can be significantly reduced. Further, since helium has a higher thermal conductivity than air or nitrogen, decay heat is efficiently transmitted from the surface of the sealed fuel container 18 to the pipe 20 through which the cooling water flows.

The fuel-sealed container 18 has a double-pipe structure. Even if either the outside or the inside is damaged, the inside radioactive material is prevented from leaking, so that the radioactive material can be stored even for a long period of storage. Leakage into the fuel storage chamber 2 is minimized. However, in the event that both the outer and inner pipes of the closed fuel container 18 having the double pipe structure are broken and radioactive substances from the spent fuel 5 leak into the fuel storage chamber 2, the fuel storage chamber Since the radiation monitor device 15 is installed on the upper part 2, the spent fuel 5 and the spent fuel 5 are detected and notified to a manager, and appropriate treatment is performed.

(Embodiment 3) A spent fuel dry storage facility according to another embodiment of the present invention will be described with reference to FIGS. This embodiment is suitable when the decay heat from spent fuel is relatively small after a long period of use.

The spent fuel dry storage facility 2 shown in FIG.
Reference numeral 3 denotes a concrete building similar to the first and second embodiments, having a fuel storage room 2 and a fuel loading room 3 therein.
The fuel loading chamber 3 is located above the fuel storage chamber 2. The structure of the fuel loading chamber 3 is the same as in the first embodiment. The fuel storage chamber 2 is located below the ground, and the floor of the fuel loading chamber 3 is substantially at the same level as the ground.

The horizontal support rods 10 are installed at equal intervals at a position slightly higher than the floor of the fuel storage chamber 2. Horizontal support rod 10
There are two directions, i.e., a cooling air flow direction and a vertical direction thereof, each of which intersects at right angles to each other. This intersecting position becomes the center of the fuel storage position 19.

The spent fuel 5 is sealed together with helium in a fuel-tight container 18. The fuel-tight container 18 used here has a double-pipe structure. Therefore, the spent fuel 5 is double sealed even without the fuel storage pipe 7.

The fuel sealed container 18 is placed in the fuel storage position 19 from the fuel loading chamber 3 and stored. The ceiling of the fuel storage chamber 2 is located above the uppermost end of the fuel-tight container 18. When the fuel-sealed container 18 is stored, spaces are formed between the floor of the fuel storage chamber 2 and the lower end of the fuel-sealed vessel 18 and between the ceiling of the fuel storage chamber 2 and the upper end of the fuel-sealed vessel 18 and serve as cooling air flow paths. The lower space is one side of the fuel storage chamber 2 and the cooling air inlet 2
4 and the upper space is connected to a cooling air outlet 25 on the opposite side of the cooling air inlet 24. Cooling air outlet 25
Is located higher than the cooling air inlet 24, and the cooling air flows into the fuel storage chamber 2 by the effect of natural convection. The cooling air first enters the space below the fuel storage room 2, then rises between the fuel sealed containers 18, flows into the space above the fuel storage room 2, and is discharged to the outside of the storage facility 23 through the cooling air outlet. .

The inside of the fuel storage chamber 2 is entirely covered with a metal plate 9, and the connection portion of the metal plate 9 is completely welded so that there is no gap. Also connected to this metal plate 9,
A large number of radiating fins 26 extending through the concrete wall of the fuel storage room 2 and extending into the ground are provided on the entire floor and side surfaces of the fuel storage room 2.

The cooling air outlet 25 has an air velocity meter 2
7 and a temperature sensor 28 are provided. By calculating based on this measurement result, the total amount of decay heat of the spent fuel 5 being stored can be known. When the storage period has elapsed for several years to several tens of years, and it is determined from the measurement results of the flow rate and temperature of the cooling air that the amount of decay heat of the spent fuel 5 has decreased to a certain value or less, the cooling air flow path is changed to metal. The fuel storage chamber 2 is closed with the plate 29 closed. This state is shown in FIG. At this time,
Since the portion of the spent fuel storage facility 23 on the ground is unnecessary, it may be removed while the aging does not progress. The threshold value of the amount of decay heat at the time of sealing is determined by the size of the fuel storage chamber 2, the size and number of the radiation fins 26, the geology around the storage facility 23, the temperature environment, and the like.

After the fuel storage chamber 2 is sealed, the air inside the fuel storage chamber 2 is replaced with nitrogen to measure the long-term soundness of the fuel sealed container 18. In addition, a radiation monitoring device 15 is provided at one location on the ceiling of the fuel storage chamber 2, and the entire fuel storage chamber 2 is monitored collectively, so that monitoring work can be reduced. Furthermore, since the temperature and humidity changes are small in the ground, the durability of the concrete wall of the storage facility 23 is better than that of the ground, and the spent fuel 5 can be stored safely for a long time.

[0047]

According to the first aspect of the present invention, by sealing the fuel storage chamber, even if a radioactive substance leaks from the fuel-sealed container, it can be prevented from being released from the facility to the outside. Further, by providing a flow path for flowing the cooling medium in the storage chamber, decay heat from the spent fuel can be efficiently released to the outside.

According to the second aspect of the present invention, the effect obtained by the first aspect of the present invention is obtained, and the oxygen in the gas is greatly reduced by replacing the air in the storage container with a rare gas, nitrogen or carbon dioxide. And the oxidation reaction of the storage container and the fuel-sealed container is reduced, so that the spent fuel can be stored safely for a long time.

According to the third aspect of the present invention, the effect obtained by the first or second aspect of the present invention can be obtained, and the cooling medium can be easily supplied from the outside at low cost.

According to the fourth aspect of the present invention, the effect obtained by the first, second, or third aspect of the present invention can be obtained, and a sufficient amount of cooling medium for heat removal can be supplied.

According to the invention of claim 5, claims 1, 2, and
In addition to the effects obtained by the third or fourth aspect, heat is easily transmitted from the fuel-sealed container to the cooling medium, and a sufficient amount of decay heat removed from the spent fuel can be obtained.

According to the invention of claim 6, according to claims 1, 2, 2
In addition to the effects obtained by the invention of 3, 4 or 5,
The fuel storage chamber can be sufficiently sealed.

According to the seventh aspect of the present invention, the entire fuel storage chamber can be easily sealed by closing the flow path of the cooling air, and the monitoring operation can be reduced by monitoring the entire fuel storage chamber at once. Can be measured.

According to the eighth aspect of the present invention, the effects obtained by the sixth or seventh aspect of the present invention are obtained, and the area of heat radiation from the fuel storage chamber is increased. The temperature decreases and the soundness increases.

According to the ninth aspect of the present invention, the first, second, and third aspects of the present invention are provided.
The effects obtained by the invention of 3, 4, 5, 6, 7 or 8 are produced, and the possibility of gas or radioactive material leaking from the inside of the container is greatly reduced by making the fuel sealed container double, Spent fuel can be safely stored for a long time.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a spent fuel dry storage facility according to an embodiment of the present invention, showing a II section of FIG. 2;

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a vertical sectional view of a spent fuel dry storage facility according to another embodiment of the present invention, showing a section taken along line IV-IV of FIG. 5;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a longitudinal sectional view of a spent fuel dry storage facility according to another embodiment of the present invention.

8 is a longitudinal sectional view of the spent fuel dry storage facility after the fuel storage chamber is sealed from FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spent fuel dry storage equipment, 2 ... Fuel storage room, 3 ... Fuel loading room, 4 ... Fuel transfer crane, 5 ... Spent fuel, 6
... Fuel sealed container, 7 ... Fuel storage tube, 8 ... Lid, 9 ... Metal plate, 10 ... Horizontal support rod, 11 ... Vertical support rod, 12 ... Pipe through which cooling air flows, 13 ... Exhaust tower, 14 ... Gas exchanger , 15
... radiation monitor device, 16 ... helium detector, 30 ... ground.

Claims (9)

[Claims] 1. A spent fuel dry storage facility having a storage room for storing a plurality of sealed containers of spent fuel generated from a nuclear power plant, wherein the storage room is sealed, and the inside of the storage room is arranged from outside to outside. A spent fuel dry storage facility, characterized by being provided with a flow path through which a cooling medium that flows to the outside again flows. 2. The spent fuel dry storage facility according to claim 1, wherein the gas in the storage chamber is replaced with one of a rare gas, nitrogen, and carbon dioxide, or a gas obtained by mixing a plurality of these. 3. The spent fuel dry storage facility according to claim 1, wherein the cooling medium is air or water. 4. A spent fuel dry storage facility according to claim 1, further comprising a pump for flowing the cooling medium in the flow path for flowing the cooling medium. 5. The spent fuel according to claim 1, wherein the cooling medium flow path is a metal pipe, and the sealed container of the spent fuel assembly is placed on the pipe for storage. Dry storage equipment. 6. A storage structure for a spent fuel formed by said metal plate by covering the inside of the wall, floor and ceiling inside said storage chamber with a metal plate. 3,
4 or 5 spent fuel dry storage facility. 7. A storage room, comprising: a storage room for storing a plurality of containers sealed with spent fuel generated from a nuclear power plant; and a flow passage connecting the outside and the inside of the storage room to take in and discharge cooling air. In a spent fuel dry storage facility for removing heat generated from spent fuel by an air flow generated due to a difference in density between the inside and outside air, the inside of a wall, a floor, and a ceiling inside the storage chamber is covered with a metal plate. A spent fuel dry storage facility, wherein a closed space of the spent fuel formed by the metal plate has a sealed structure by closing a connection portion between the flow path of the cooling air and the inside of the storage chamber. 8. A plurality of metal parts installed so as to be connected to a metal plate which covers the inside of a wall, a floor, and a ceiling inside the storage room and penetrate through the wall of the storage room to be connected to the outside of the storage room. The spent fuel dry storage facility according to claim 6 or 7, further comprising: 9. A sealed container for sealing the spent fuel, wherein:
The spent fuel dry storage facility according to claim 1, 2, 3, 4, 5, 6, 7, or 8 having a double pipe structure.