JPH1010287A - Radiation shielding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation shielding device which is easy to treat such as placing and removing of the shielding body and is simply processed after use. SOLUTION: A shield body 11 is made in a hollow sack shape constituted of a plurality of separated cells 12 and water for shielding is supplied inside with a water supply mechanism 15 from supply/exhaust holes 13 to shield radiation. By this, the shield body 11 is placed in a cell and the like without filling water and shielding is made available only by filling water inside. Therefore, the treatment is easy, the water in the shield body can be easily processed after use without being contaminated mostly and the treatment of sack shape shield body 11 as solid waste can be easily done.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation shielding device required for repairing or inspecting work at a nuclear facility or the like, which is easy to temporarily install and minimizes generation of waste after use. It was made.

[0002]

2. Description of the Related Art In a facility handling radioactive materials such as a nuclear facility, when repairing or inspecting equipment, the inside of a cell in which the equipment is installed is decontaminated to sufficiently reduce an air dose rate of radiation. It is necessary to perform the treatment at a lower level, and when decontamination alone is not sufficient, it is necessary to shield the radiation.

[0003] Conventionally, when such radiation shielding is required, a lead shielding body is placed in a cell and installed outside the radiation source.

[0004]

However, when a lead shield is used, there is a problem that the weight of the shield is increased and handling is difficult, and especially handling in a cell is difficult.

[0005] After the work is completed, the shield is turned into waste and must be treated. However, with a lead shield, the volume does not change even after vinyl curing, the weight is heavy, and the treatment is easy. There is also the problem that it cannot be done.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and provides a radiation shielding device that can be easily handled such as installation and removal of a shielding body and can be easily processed after use. It is something to offer.

[0007]

According to a first aspect of the present invention, there is provided a radiation shielding device having a hollow bag shape provided outside a radiation generating section and capable of sealing water therein. And a water supply mechanism for supplying water for shielding radiation into the shield.

According to this radiation shielding apparatus, the shielding body is formed in a hollow bag shape, and water is supplied from a water supply mechanism to shield the radiation. The water can be shielded simply by putting water inside and the handling is easy, the water in the bag can be easily treated even after use with little contamination, and the treatment of the bag-shaped shield Can also be easily done.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the inside of the hollow shield is divided into a plurality of rooms. It is assumed that.

According to this radiation shielding device, the inside of the bag-shaped shielding body is divided into a plurality of rooms, so that required strength and required thickness can be easily secured.

Further, the radiation shielding device according to the third aspect of the present invention, in addition to the configuration according to the first or second aspect, is long in such a manner that the hollow shielding body is wrapped around the radiation generating portion in multiple layers and can be arranged. It is characterized by being formed in.

According to this radiation shielding device, the shielding body is formed to be long and can be wound and arranged.
A hose-shaped shield can be wound around a pipe or the like for shielding, or can be spirally wound on a plane to shield, and can be easily installed in a narrow cell or the like.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 relate to an embodiment of a radiation shielding device according to the present invention. FIG. 1 is a schematic configuration diagram showing a state where the radiation shielding device is installed in a cell, FIG. 2 is an enlarged view showing the schematic configuration, and FIG. FIG.

The radiation shielding device 10 is, for example, shown in FIG.
When repairing or inspecting the crane 3 in the cell 2 in which the storage tank 1 serving as a radiation generating unit as shown in
It is installed so as to cover the working table 4 above the storage tank 1 and is used for shielding radiation from the storage tank 1.

The radiation shielding device 10 is provided with a hollow bag-shaped shielding body 11 into which water can be poured. For example, as shown in FIG. 3, the external shape is formed in a rectangular parallelepiped shape. Are divided into a plurality of rooms 12, 12,....

The shielding body 11 is made of a material which is flexible and can contain water, and has a water supply / discharge port 13 formed in communication with each room 12. 14 is attached so that water can be supplied and discharged from one place.

A pump 16 and a water tank 17 are provided as a water supply mechanism 15 for supplying water to the shield 11, and can be connected to the water supply / discharge pipe 14 via a connector 18.

The radiation shielding apparatus 10 constructed as described above
When repairing or inspecting the crane 3 in the cell 2 above the storage tank 1 which is a radiation generating unit, firstly, after the decontamination in the cell 2 is performed, there is radiation from the storage tank 1. It is set on the working table 4 in order to shield it.

When the radiation shielding device 10 is installed on the working table 4, the shielding body 11 is brought into the cell 2 in a crushed state or a wrapped state, and is spread and installed on the working table 4.

If necessary, before the shield 11 is expanded, a curing such as laying a sheet on the working table 4 is performed.

After that, the connector 18 of the water supply mechanism 15 installed in the cell 2 or outside the cell 2 is connected to the water supply / discharge pipe 14 communicating with each room 12 of the shield 11, and the water tank is pumped by the pump 16. 17 water in each room 12 of the shield 11
And put it in water.

Thus, the shielding of the radiation from the storage tank 1 is completed by immersing the water in the shield 11.

The crane 3 is repaired and inspected while the radiation from the storage tank 1 is shielded.

When the radiation shielding device 10 is removed after the crane 3 has been repaired and inspected, the water in each room 12 of the shielding body 11 is drained and the water is drained. The water inside is almost free of radioactive contamination and can be easily treated and discharged.

Then, the shielding body 11 from which water has been discharged is crushed or rolled up and collected outside the cell 2.

Although the recovered shield 11 is treated as solid waste, it can be easily treated as compared with the case where conventional lead is used because the volume can be reduced.

In this way, the radiation shielding device 10 is installed, then removed and treated as waste.
At the time of installation, it is only necessary to bring the bag-shaped shield 11 into the cell 2 and then immerse the water, so that the handling is much lighter and easier than when lead is used.

After the radiation shielding device 10 is used, water that is sealed in the shielding body 11 and is basically not contaminated is discharged and treated.
Only needs to be treated as solid waste, the volume can be greatly reduced by incineration or the like, the waste can be easily treated, and the amount of solid waste generated can be reduced.

Further, in this radiation shielding device 10,
It is possible to form the shield 11 to a thickness necessary to obtain a sufficient shielding effect without much concern about the disposal and generation amount of waste after use, and the amount of exposure of workers performing repairs and inspections Can be greatly reduced.

Next, another embodiment of the radiation shielding device of the present invention will be described with reference to FIG.

The radiation shielding device 20 comprises a shielding body 21
Is formed in the shape of a long hose having a substantially rectangular cross section and is formed in a hollow bag shape, and has a water supply / discharge port 2 for shielding at one end thereof.
2 is provided with a water supply / drain pipe 23 attached thereto, so that water for shielding can be applied by connecting to a water supply mechanism 15 via a connector 18 similarly to the shielding device 10 already described. Has become.

Such a radiation shielding device 20 is suitable for use in shielding radiation when, for example, repairing or inspecting the nozzle 5 or the pipe 6 and the like. The other end opposite to the port 22 is wound around the pipe 6 so as to be in contact with the pipe 6, and wound in a swirl shape so that no gap is left in a swollen state with water. Hold with a band or the like to hold.

After the shield 21 is spirally wound in this manner, the water supply mechanism 1 is connected to the water supply / discharge pipe 23 communicating with the supply / discharge port 22.
5 connector 18 and pump 1 from water tank 17.
At 6, water for shielding is supplied and inserted into the inside of the shield 21.

As a result, the shield 21 is swollen by water, and the inner and outer peripheries are in close contact with each other to form a spiral with no gap, thereby completing the shield.

According to such a radiation shielding device 20, radiation can be shielded by the water stuck inside the shielding body 21.

The installation and the treatment after use are easy as in the radiation shielding apparatus 10 already described, and the generation of solid waste can be suppressed.

In the radiation shielding device 20, since the shielding body 21 is formed in a long hose shape, it can be carried into the cell 2 or the like from a small area through portion.

The shielding body 21 of the radiation shielding apparatus 20 may be divided into a plurality of rooms.
In this case, a supply / drain port may be provided in each room, and these may be assembled and communicated by a water supply / drain pipe.

The shield 21 may be arranged horizontally on a working table or the like without being wound around a nozzle or a pipe, and may be installed in a spiral shape. The shield area can be easily reduced by appropriately changing the size of the spiral. Can be changed.

Further, in the radiation shielding device of each of the above-described embodiments, the case where the shielding body has only one layer has been described.
A plurality of layers may be provided so as to be stacked, and the shielding effect can be further increased.

[0041]

According to the radiation shielding apparatus according to the first aspect of the present invention, as described in detail with the above embodiment, the shielding body is formed in a hollow bag shape, and the water is supplied from the water supply mechanism to the inside thereof. To prevent radiation by putting it in a cell or the like without pouring water into it and installing it and pouring water inside. The water inside can be easily treated without being contaminated, and the bag-shaped shield which becomes solid waste can be easily treated, and the amount of generated waste can be suppressed.

According to the radiation shielding apparatus of the second aspect of the present invention, the interior of the bag-shaped shielding body is divided into a plurality of rooms, so that necessary strength and required thickness are ensured. Can be easily done.

Further, according to the radiation shielding apparatus of the third aspect of the present invention, the shielding body is formed to be long and can be wound and arranged, so that the hose-shaped shielding body is provided around a pipe or the like. It is possible to wind and shield, or to wind and wind in a spiral shape to shield, so that it can be easily installed in a narrow cell or the like, and the shielding area can be easily changed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a radiation shielding device according to an embodiment of the present invention, which is installed in a cell.

FIG. 2 is an enlarged view showing a schematic configuration according to an embodiment of the radiation shielding device of the present invention.

FIG. 3 is a perspective view showing a schematic configuration according to an embodiment of the radiation shielding device of the present invention.

FIG. 4 is a perspective view showing a schematic configuration according to another embodiment of the radiation shielding device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank (radiation generating part) 2 Cell 3 Crane 4 Working table 5 Nozzle 6 Piping 10 Radiation shielding device 11 Shield 12 Room 13 Supply / discharge port 14 Water supply / discharge pipe 15 Water supply mechanism 16 Pump 17 Water tank 18 Connector 20 Radiation Shielding device 21 Shield 22 Supply / drain 23 Water supply / drain

Claims (3)

[Claims] 1. A hollow bag-shaped shield provided outside the radiation generating section and capable of sealing water therein, and a water supply mechanism for supplying water for shielding radiation into the shield. Radiation shielding device. 2. The radiation shielding apparatus according to claim 1, wherein the interior of the hollow shield is divided into a plurality of rooms. 3. The radiation shielding apparatus according to claim 1, wherein the hollow shielding body is formed to be long so as to be wrapped around the radiation generating section in a multiplex manner and arranged.