JP2513476Y2 - Storage of radioactive material - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage of radioactive material, and particularly to simplify the structure and improve cooling performance.

[0002]

2. Description of the Related Art Generally, high-level radioactive waste generated in a nuclear power plant or the like can be improved in handleability by subjecting it to vitrification treatment, for example.
The so-called solidified package which has been subjected to glass solidification is planned to be stored in a radioactive waste storage for a long period of time as shown in FIG.

In FIG. 2, reference symbol P is a storage package such as a solidified package obtained by subjecting high-level radioactive waste to glass-solidifying treatment, etc., 1 is a cell chamber for storing and storing a large number of storage packages P, 2 is a radiation shielding wall (concrete wall) surrounding the cell chamber 1, 3 is a transfer chamber provided above the cell chamber 1, and 4 is a ceiling slab made of a concrete wall separating the cell chamber 1 and the transfer chamber 3. 5 is a storage pipe (inner pipe) such as a steel pipe that is suspended from the ceiling slab 4 to store a plurality of radioactive wastes in a vertically stacked state, and 6 is a support structure that is horizontally installed in the cell chamber 1. Object (support frame), 7 is an outer tube which is supported by the support structure 6 and surrounds the storage tube 5, 8 is an outside air inlet, 9 is an air outlet, 10 is an air supply shaft, 11 is an exhaust shaft, and 12 is a housing. A closure lid for sealing the top of the tube 5, Reference numeral 13 denotes a cylindrical cooling flow path formed between the storage pipe 5 and the outer pipe 7 and communicated with the air supply shaft 10 and the exhaust shaft 11.

In the storage having such a structure, when the temperature of the storage tube 5 rises due to the decay heat of the radioactive material, convection occurs in which the air in the cylindrical cooling passage 13 rises, as shown by the arrow in FIG. Then, the air taken in from the outside air inlet 8 cools it, and the heated air is discharged from the air outlet 9. Therefore, a power source is not required, cooling is performed by natural convection during decay heat generation, and high safety is ensured regardless of power failure or the like.

[0005]

However, in the storage of such a structure, during storage of radioactive materials for a long period of time, a cylindrical shape is formed due to external factors such as accidental disasters and internal factors such as corrosion of components. When the amount of ventilation to the cooling flow path 13 decreases, the cooling action of the storage package P decreases and the soundness of the storage is impaired.

The present invention has been made in view of the above circumstances, and has as its object the simplification of the structure of the storage package housing portion, the improvement of the cooling performance, and the reduction of radiation leakage. is there.

[0007]

SUMMARY OF THE INVENTION In addition to a technique in which a plurality of storage tubes for storing radioactive storage packages are arranged in a vertical direction in a cell chamber surrounded by a radiation shielding wall, the present invention provides Te, wherein the housing tube is filled with cooling water therein and cooling water supply means for the circulation of cooling water is arranged in the connection state, the heat removal means distribution to the cooling water supply means
The cooling water supply means is connected to the heat removal means.
A transfer pipe that sends the cooling water that has been removed of heat to the inside of the storage pipe,
A water supply pump arranged in the middle of the transfer pipe,
Individually arranged in a connected state between the pipe and the upper inside of the storage pipe.
Multiple water supply pipes that send cooling water into the storage pipe of the
Recovery for connecting the inner bottom of the storage pipe to the heat removal means
Pipes and multiple water supply pipes that feed into individual storage pipes
It serves as a storage of radioactive material having a plurality of control valves for adjusting the amount of water .

[0008]

By the operation of the cooling water supply means, the cooling water is sent into the storage pipe, and heat is removed by directly contacting the storage package inside the storage pipe. The cooling water, which has reached a high temperature, is sent to the heat removal means to remove the heat, and then circulated to be returned to the storage pipe again. When circulating these cooling water
Then, the cooling water that has been deheated is supplied with multiple water by the water supply pump.
Inside each storage pipe in a branched state by passing through the pipe
The amount of cooling water sent to the storage pipe
Is a storage pack for each storage pipe with multiple control valves.
The storage package is adjusted according to the amount of heat generated by the cage.
The setting is made according to the cooling degree of the gyro. In addition, radiation leakage is reduced by immersing the storage package in the cooling water.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the radioactive substance storage according to the present invention will be described below with reference to FIG.

In FIG. 1 as well, portions common to those of FIG. 2 cited in the conventional example are designated by the same reference numerals and described.

In the storage according to the embodiment, the outer pipe 7, the outside air inlet 8, the air outlet 9, the air supply shaft 10, the exhaust shaft 11, the cylindrical cooling passage 13 and the like shown in FIG. 2 are omitted. Instead of these, the cooling water supply means 21 and the heat removal means 22 are arranged at an external position such as above the cell chamber 1.

The cooling water supply means 21 is arranged at an appropriate position and stores a water tank 23 for supplying the cooling water, and a transfer pipe 24 for drawing the cooling water from the water tank 23.
Water supply pump 25 connected to the transfer pipe 24, and water supply for connecting the water supply pump 25 and the upper part of the storage pipe 5 so that the inside of the storage pipe 5 is filled with cooling water. It has a pipe 26, a recovery pipe 27 for connecting the inner bottom portion of the storage pipe 5 and the heat removal means 21 to each other, and a plurality of control valves 28 arranged in each pipe passage.

The heat removing means 22 has a heat exchanger structure or the like,
It is connected to a radiator 29 arranged in the atmosphere outside the cell chamber 1 to remove heat.

In the storage having such a structure, when the temperature of the storage package P rises due to the decay heat of the radioactive material, the cooling water filled in the storage pipe 5 is heated.

Along with the loading operation of the storage package P into the storage pipe 5, the cooling water stored in the water storage tank 23 is supplied to the storage pipe 5 via the transfer pipe 24, the water supply pump 25, and the water supply pipe 26. And fill up. Further, when the storage package P is immersed in the cooling water, the storage package P is surrounded by the cooling water which is the radiation shielding substance , so that the radiation leakage from the storage pipe 5 is reduced. .

Water supply pump 2 in the cooling water supply means 21
When the cooling water in the low temperature state is sent to the storage pipe 5 via the water supply pipe 26 by operating 5, the cooling water comes into direct contact with the storage package P to remove the heat, and the temperature of the cooling water becomes high. Is guided below the storage pipe 5, and the recovery pipe 27
The cooling water is sent to the heat removal means 22 via the heat exchanger 22, is returned to the cooling water in a low temperature state by heat exchange, and is further sent to the water supply pump 25 via the transfer pipe 24 for circulation.

In the circulation of the cooling water, the control valve 28
The amount of water to each storage pipe 5 is adjusted by averaging.

In the heat removing means 22, heat is removed by exchanging heat with the radiator 29.

In the embodiment described so far, the storage package P is a so-called solidified package that has been subjected to a treatment such as vitrification. However, the storage package P is not limited to this and is generally used. It includes packages of radioactive waste and packages of spent fuel.

Further, the heat removal means 22, the water storage tank 23, the water supply pump 25, the water supply pipe 26 and the recovery pipe 27 in FIG.
The installation positions and connection states of the above are not limited to the illustrated examples, and can be set arbitrarily.

[0021]

According to the radioactive substance storage of the present invention, a cooling water supply means and a heat removal means for filling the inside of the storage pipe arranged in the cell chamber with cooling water and circulating the cooling water. Is provided, the following effects can be obtained. (1) Since the cooling water is sent to the storage pipe by the operation of the cooling water supply means and the heat is removed by directly contacting the storage package inside the storage pipe, the heat removal efficiency of the storage package can be improved. it can. (2) Interposition of cooling water, which is a radiation shielding substance, by placing the storage package in the cooling water.
Radiation leakage can be reduced based on the above. (3) Based on the viscosity of the cooling water inside the storage pipe, a seismic resistance effect that suppresses rapid movement of the storage package occurs, and simplification of the seismic structure can be achieved. (4) Adjust the amount of cooling water for each storage pipe with the control valve.
Cooling according to the amount of heat generated by the storage package
It is possible to manage the degree to ensure the soundness during storage.
it can.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a radioactive substance storage according to the present invention.

FIG. 2 is a front sectional view showing a conventional example of a radioactive waste storage.

[Explanation of symbols]

 P Storage package 1 Cell room 2 Radiation shielding wall (concrete wall) 3 Transfer room 4 Ceiling slab 5 Storage pipe (inner pipe) 6 Support structure (support frame) 12 Closing lid 21 Cooling water supply means 22 Heat removal means (heat) Exchanger) 23 Water tank 24 Transfer pipe 25 Water supply pump 26 Water supply pipe 27 Recovery pipe 28 Control valve 29 Radiator

Claims (1)

(57) [Scope of utility model registration request] 1. A plurality of storage tubes (5) in which a storage package (P) having a radioactive property is loaded are arranged along a vertical direction in a cell chamber (1) surrounded by a radiation shielding wall (2). In the storage of the radioactive substance, cooling water supply means (21) for filling the inside of the storage pipe with cooling water and circulating the cooling water is arranged in a connected state, and is connected to the cooling water supply means. thermal means (22) is arranged, said cooling
The water supply means is connected to the heat removal means to remove the heat of the cooling water.
Pipe (24) for feeding the inside of the storage pipe, and the transfer pipe
The water supply pump (25) placed in the middle of the
Individually arranged in a connected state between the pipe and the upper inside of the storage pipe.
Plural water pipes (2
6) and the inner bottom of the storage tube and the heat removal means are connected.
For collecting water (27) and multiple water supply pipes
Multiple control valves (2 to adjust the amount of water sent to the storage pipe)
8) The storage of radioactive material characterized by having .