JPH0515000U - Radioactive material storage - Google Patents

Abstract

(57) [Summary] (Modified) [Objective] The present invention relates to a storage of radioactive material, and is intended to improve cooling performance and radiation shielding performance and to simplify the structure. [Composition] A cell chamber 1 surrounded by a radiation shielding wall 2,
A cooling water supply means 21 and a heat removal means 22 for filling the inside of the storage pipe 5 with the cooling water and circulating the cooling water are provided,
The cooling water comes into direct contact with the storage package inside the storage tube 5 to remove heat and shield radiation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radioactive substance storage, and particularly, aims to simplify the structure and improve cooling performance.

[0002]

[Prior Art]

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

In FIG. 2, reference symbol P is a storage package such as a solidified package obtained by subjecting high-level radioactive waste to vitrification, etc., and 1 is a cell chamber for storing a large number of storage packages P. 2 is a radiation shielding wall (concrete wall) that surrounds the cell chamber 1, 3 is a transfer chamber provided above the cell chamber 1, and 4 is a concrete wall separating the cell chamber 1 and the transfer chamber 3. The ceiling slab 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 horizontally installed in the cell chamber 1. Supporting structure (supporting frame), 7 is an outer tube supported by the supporting structure 6 and surrounding 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 , 12 seals the upper part of the storage tube 5塞蓋, 13 is a tubular cooling passage is communicated with the formed and supply shaft 10 and an exhaust shaft 11 between the housing tube 5 and outer tube 7.

In the storage having such a structure, when the temperature of the storage pipe 5 rises due to the decay heat of the radioactive material, convection occurs in which the air in the tubular cooling flow path 13 rises, as shown by the arrow in FIG. Further, the air taken in from the outside air inlet 8 cools it, and the heated air is discharged from the air outlet 9. Therefore, it does not require a power source and is cooled by natural convection during decay heat generation, which provides high safety without being affected by blackouts.

[0005]

[Problems to be solved by the device]

 However, in the storage of such a structure, during long-term storage of radioactive materials, the amount of air permeated into the cylindrical cooling flow path 13 is increased due to external factors such as accidents and internal factors such as corrosion of components. When it decreases, the cooling effect of the storage package P decreases and the integrity of the storage is impaired.

The present invention has been made in view of the above circumstances, and is intended to simplify the structure of the storage package housing portion, improve cooling performance, and reduce radiation leakage. is there.

[0007]

[Means for Solving the Problems]

 The present invention is based on a technique in which a plurality of storage tubes loaded with radioactive storage packages are arranged in a vertical direction in a cell chamber surrounded by a radiation shielding wall. A cooling water supply means for filling the water and circulating the cooling water is arranged in a connected state, and the cooling water supply means is provided with a heat removal means to serve as a radioactive substance storage.

[0008]

[Action]

 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 high-temperature cooling water is sent to the heat removal means to remove heat, and then returned to the storage pipe again for circulation. Radiation leakage is reduced by immersing the storage package in cooling water.

[0009]

【Example】

 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 will be described with the same reference numerals.

In the storage according to the embodiment, the outer pipe 7, the outer air inlet 8, the air outlet 9, the air supply shaft 10, the exhaust shaft 11, the tubular cooling flow path 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 external positions such as above the cell chamber 1.

The cooling water supply means 21 is arranged at an appropriate position to store the cooling water, a transfer pipe 24 for drawing the cooling water from the storage tank 23, and the transfer pipe 24. A water supply pump 25 connected to the water supply pump 25, and a water supply pipe 26 arranged in a connected state between the water supply pump 25 and the upper part of the storage pipe 5 for making the inside of the storage pipe 5 filled with cooling water, A collection 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 line are provided.

The heat removal means 22 has a heat exchanger structure or the like and 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 increases 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 transferred to the storage pipe 5 via the transfer pipe 24, the water supply pump 25, and the water supply pipe 26. Supply and fill up. In addition, when the storage package P is immersed in the cooling water, the storage package P is surrounded by the cooling water that is a radioactive shielding material, so that the radiation leakage from the storage pipe 5 is reduced. Become.

When the cooling water in a low temperature state is sent to the storage pipe 5 via the water supply pipe 26 by operating the water supply pump 25 in the cooling water supply means 21, the cooling water comes into direct contact with the storage package P. The cooling water having a high temperature is guided to the lower part of the storage pipe 5, is sent to the heat removal means 22 via the recovery pipe 27, and is returned to the cooling water in a low temperature state by heat exchange. Then, circulation is performed in which the water is supplied to the water supply pump 25 via the transfer pipe 24.

In the circulation of the cooling water, the control valve 28 adjusts the amount of water to each storage pipe 5 to perform averaging.

The heat removing means 22 removes heat 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, but the storage package P is not limited to this and is generally It includes radioactive wastes packaged and spent fuels packaged.

Further, the installation positions and connection states of the heat removal means 22, the water storage tank 23, the water supply pump 25, the water supply pipe 26, the recovery pipe 27, etc. in FIG. 1 are not limited to those shown in the drawing, but may be set arbitrarily. be able to.

[0021]

[Effect of the device]

 According to the radioactive substance storage according to the present invention, the inside of the storage pipe arranged in the cell chamber is provided with the cooling water supply means and the heat removal means for circulating the cooling water. Since it is intended, the following effects can be obtained. (1) Cooling water is sent into the storage pipe by the operation of the cooling water supply means, and heat is removed by directly contacting the storage package inside the storage pipe, so that the heat removal efficiency of the storage package is improved. be able to. (2) By immersing the storage package in cooling water, radiation leakage can be reduced. (3) Based on the viscosity of the cooling water inside the storage pipe, a seismic resistance effect that suppresses the rapid movement of the storage package occurs, and simplification of the seismic structure can be achieved.

[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 Transport 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 storage tank 24 Transfer pipe 25 Water supply pump 26 Water supply pipe 27 Recovery pipe 28 Control valve 29 Radiator

Claims (1)

[Scope of utility model registration request] 1. A storage box for radioactive substances, wherein a plurality of storage tubes loaded with radioactive storage packages are arranged along a vertical direction in a cell chamber surrounded by a radiation shielding wall, wherein the storage tubes are provided. A storage container for radioactive material, characterized in that cooling water supply means for filling the inside thereof with cooling water and circulating the cooling water are arranged in a connected state, and heat removal means is arranged in the cooling water supply means. ..