JPH0572395A - Container for radioactive waste - Google Patents

Abstract

(57) [Summary] [Purpose] This is a container for storing radioactive waste, and when storing the radioactive waste in the container, during the process of introducing the radioactive waste into the container, the radioactive waste is transferred to the atmosphere. Prevents radioactive contamination of the surrounding environment without the release of radioactivity. [Configuration] The opening 2 is provided in the opening 2 provided on the upper surface of the container 1.
An extensible cylindrical shield 9 is provided for shielding between the atmosphere and the radioactive waste inlet 5, and an squeezing mechanism 13 for squeezing and closing the tubular shield 9 at an intermediate portion thereof. Is provided. Therefore, when the radioactive waste 15 is charged into the container 1 through the charging port 5, no radioactivity is released from the radioactive waste into the atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for storing radioactive waste discharged from a nuclear power plant and various nuclear facilities.

[0002]

2. Description of the Related Art It is often the case that radioactive waste generated from a nuclear power plant and other various nuclear facilities is safely stored in a container without polluting the environment and then safely stored or buried in the ground or the like. It is an issue.

Storage of such radioactive waste in a container has been conventionally performed as follows. That is, as shown in FIG. 6, a radioactive waste storage container 1 made of, for example, a drum, having an opening 2 for receiving the radioactive waste on the upper surface thereof, is placed on a carriage 3 surrounded by a shield 4. The trolley 3 is located below the radioactive waste input port 5 having the chute 6 provided in the upper layer. Then, the radioactive waste is passed through the chute 6 and the charging port 5 to open the opening 2
Then, it is put into the container 1 and stored. Then, the opening 2 is covered with a lid to seal the inside of the container 1 and the carriage 3 is moved to a predetermined place.

[0004]

When storing the above-mentioned radioactive waste in the container 1, there are the following problems. That is, as shown in FIG. 6, the container 1 placed on the carriage 3
Is positioned below the radioactive waste input port 5 provided in the upper layer, a certain amount of space exists between the input port 5 and the opening 2 of the container 1. Therefore, when the radioactive waste is passed through the chute 6 and the charging port 5 and charged into the container 1 through the opening 2, radioactivity is released from the radioactive waste into the atmosphere in the space described above. as a result,
Radioactive contamination occurs in the environment around the container 1.

Therefore, an object of the present invention is to solve the above-mentioned problems, and when radioactive waste is stored in a container, the radioactive waste is emitted from the radioactive waste into the atmosphere during the process of introducing the radioactive waste into the container. It is an object of the present invention to provide a container for radioactive waste that does not emit radioactive substances and therefore does not cause radioactive contamination in the surrounding environment.

[0006]

[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies to solve the above problems. As a result, the opening of the container for storing radioactive waste is provided with an expandable tubular shield for shielding the space between the radioactive waste inlet and the atmosphere, and squeezing in the middle of the cylindrical shield. If a mechanism is provided so that the middle part can be closed, radioactivity will not be released from the radioactive waste into the atmosphere during the process of introducing the radioactive waste into the container, preventing radioactive contamination of the surrounding environment. I found that I would get it.

The present invention has been made on the basis of the above-mentioned findings, and it is located below the radioactive waste input port, and the radioactive waste input from the input port is passed through the opening and placed therein. A container for storing radioactive waste, which has an opening for receiving radioactive waste on the upper surface for storing, in the opening of the container, for shielding the atmosphere between the opening and the radioactive waste input port from the atmosphere. The present invention is characterized in that an expandable and contractible tubular shield is provided, and a diaphragm mechanism for closing and closing the tubular shield is provided in an intermediate portion of the tubular shield.

[0008]

As described above, the container of the present invention is provided with the expandable and contractible cylindrical shield at the opening of the container, and the diaphragm mechanism for closing the cylindrical shield at the intermediate portion thereof. Has been. Therefore, when the radioactive waste is put into the container, if the upper end of the cylindrical shield is attached to the radioactive waste input port, the space between the container opening and the radioactive waste input port is shielded from the atmosphere by the cylindrical shield. To be done. As a result, radioactivity is not released into the atmosphere from the radioactive waste put in the container, and therefore radioactive contamination of the environment around the container can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional schematic front view showing one embodiment of the container of the present invention. As shown in FIG. 1, a radioactive waste storage container 1 made of, for example, a stainless steel drum and having an opening 2 for receiving the radioactive waste on its upper surface is placed on a trolley 3 surrounded by a shield 4. Placed
The trolley | bogie 3 is located below the radioactive waste input port 5 which has the chute 6 provided in the upper hierarchy similarly to the former. Reference numeral 7 denotes an electric gate provided below the chute 6 for opening and closing the chute 6, and normally the gate 7 closes the chute 6.

The non-polluted area A on the lower floor where the cart 3 on which the container 1 is placed is located, and the radioactive waste is the chute 6 at 8.
It is a concrete ceiling that divides the upper floor of the radioactive contamination area B to be charged inside. Radioactive waste input port 5
Are provided so as to penetrate the ceiling 8. The uncontaminated area A is maintained under atmospheric pressure, and the radioactively contaminated area B is maintained under negative pressure.

At the opening 2 of the container 1, a lower end 9a of a stretchable tubular shield 9 made of, for example, rubber or woven cloth is fixed to shield the space between the opening 2 and the radioactive waste inlet 5 from the atmosphere. Has been done. Reference numeral 10 is a flange provided on the periphery of the opening 2 for fixing the lower end of the tubular shield 9. The cylindrical shield 9 is normally in a contracted state as shown in FIG. 1, but when receiving radioactive waste, it is extended as shown in FIG. The flange 11 attached to the lower surface is attached by an appropriate means. Thus, the space between the inlet 5 of the ceiling 8 and the opening 2 of the container 1 is shielded from the atmosphere by the cylindrical shield 9.

A cushioning material 12 made of, for example, styrofoam or the like is mounted on the bottom surface of the container 1 to absorb the impact of the radioactive waste. A diaphragm mechanism 13 for squeezing the tubular shield 9 to close the tubular shield 9 at the intermediate portion is attached to the intermediate portion of the tubular shield 9. As the diaphragm mechanism 13, it is possible to use an appropriate means such as straps attached to the outer periphery of the tubular shield 9, binding with a metal band, tightening, and the like.

As described above, after the space between the opening 2 of the container 1 and the radioactive waste input port 5 is shielded from the atmosphere by the cylindrical shield 9, it is provided on the lower part of the chute 6 as shown in FIG. The electric gate 7 is opened, and the inner sleeve 14 for protecting it is inserted into the cylindrical shield 9 through the insertion port 5. Next, the radioactive waste 15 is put into the container 1 from the chute 6 through the inner sleeve 14.

In this way, radioactive waste is stored in the container 1.
After 15 is charged, as shown in FIG. 4, the intermediate portion of the cylindrical shield 9 is closed by the diaphragm mechanism 13, and the gate 7 of the chute 6 is closed. Next, as shown in FIG. 5, the upper end 9b of the tubular shield 9 is removed from the charging port 5, the tubular shield 9 is pushed into the container 1, and then the lid 16 is attached to the opening 2 of the container 1. To do. Thus, the inside of the container 1 is sealed, and the container 1 is carried out to a predetermined position by the carriage 3. The opening 2 of the container 1 may be provided with a gate for opening and closing the opening 2. If the gate is provided in the opening 2 as described above, the lid 16 becomes unnecessary.

As described above, according to the radioactive waste container of the present invention, the expandable tubular shield 9 is provided in the opening 2 of the container 1, and the radioactive waste 15 is put into the container 1. At this time, the cylindrical shield 9 shields the space between the radioactive waste inlet 5 and the opening 2 of the container 1 from the atmosphere. Therefore, the radioactive waste 15 put into the container 1 does not release radioactivity into the atmosphere. When the tubular shield 9 is removed after the radioactive waste 15 is stored in the container 1, the diaphragm mechanism 13 provided in the intermediate portion of the tubular shield 9 is also used.
Since the intermediate portion of the cylindrical shield 9 is closed by the above, the radioactive waste 15 in the container 1 does not release radioactivity into the atmosphere.

[0016]

As described above, according to the present invention,
When storing radioactive waste in a container, during the process of introducing the radioactive waste into the container, no radioactivity is released from the radioactive waste into the atmosphere, so the surrounding environment is not contaminated. Which is useful for industrial purposes.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional schematic front view showing one embodiment of the container of the present invention.

FIG. 2 is a partial cross-sectional schematic front view showing a state in which the upper end of the cylindrical shield in the container of the present invention is attached to the radioactive waste input port.

FIG. 3 is a partial cross-sectional schematic front view showing a state in which radioactive waste is put into the container of the present invention.

FIG. 4 is a partial cross-sectional schematic front view showing a state in which the intermediate portion of the cylindrical shield is closed after the radioactive waste is stored in the container of the present invention.

FIG. 5 is a partial cross-sectional schematic front view showing a state where the lid is attached after the radioactive waste is stored in the container of the present invention.

FIG. 6 is a partial cross-sectional schematic front view showing a conventional container.

[Explanation of symbols]

 1 Container 2 Opening 3 Bogie 4 Shield 5 Inlet 6 Chute 7 Gate 8 Ceiling 9 Cylindrical Shield 10 Flange 11 Flange 12 Buffer material 13 Throttling mechanism 14 Inner sleeve 15 Radioactive waste 16 Lid

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G21F 9/36 511 A 7156-2G

Claims (1)

[Claims] 1. A radioactive waste which is located below a radioactive waste input port and has an opening for receiving the radioactive waste on the upper surface for storing the radioactive waste input from the input port therein. In the container for storage, at the opening of the container, an expandable and contractible cylindrical shield for shielding between the opening and the radioactive waste input port from the atmosphere is provided, and the middle of the cylindrical shield. A container for storing radioactive waste, characterized in that a squeezing mechanism for squeezing and closing the part is provided.