JP2001264486A - Waste container with gas outlet with screw-in lid - Google Patents

Abstract

(57) [Summary] [Problem] To provide an exchangeable filter that can release gas generated during storage as needed, and to reliably maintain the containment performance of stored items except when releasing gas, and if necessary The present invention provides an improved waste storage container which can easily provide a high degree of sealing performance and can also be filled with a fluid filling as needed. A waste container having a gas discharge hole with a screw-in lid according to the present invention is provided with a gas discharge hole penetrating from the top surface of the handling head to the inside of the container at the center of a handling head provided at the top of the container. . The gas discharge hole is formed from a large diameter portion, a medium diameter portion, and a small diameter portion from top to bottom, and an upper step 1 is provided between the large diameter portion and the middle diameter portion.
6, a lower step 17 is formed between the middle diameter portion and the small diameter portion. A screw-in filter cartridge 20 provided with a gas discharge port is detachably screwed into a screw engraved on the inner periphery of the small diameter portion of the gas discharge hole so as to be locked at a lower step. A screw-in lid 30 is detachably screwed to a screw engraved on the inner periphery of the part so as to be locked at an upper step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste storage container having a high sealing performance, and more particularly, to a waste storage container capable of generating gas during storage in a container. The present invention relates to a waste storage container that can release gas as needed during storage and that can be safely sealed and stored for a long period of time.

[0002]

2. Description of the Related Art A container for storing and storing radioactive solid waste discharged from a nuclear facility or the like in a sealed state is generally called a canister, and its typical structure is shown in FIG.
An example is shown below. That is, the storage container 1 is made of, for example, a stainless steel cylinder having a top surface and a bottom surface sealed, and a handling head 2 is provided at the top of the container so as to be gripped when the container is transported. The upper part 1a and the lower part 1b are cut at the upper horizontal cutting point. After removing the upper part 1a of the container from this cutting place, the radioactive solid waste is compressed and the disc-shaped waste compressed bodies 3 are sequentially stacked and stored in the lower part 1b of the container,
Next, the radioactive solid waste 3 can be hermetically stored in the container 1 by covering the upper portion 1a of the container, fixing the cut surfaces to each other, and fixing them by welding.

[0003]

As described above, the radioactive solid waste 3 hermetically sealed in the storage container 1 generates hydrogen gas by radiolysis of organic substances and water contained therein. During storage, there is a danger that the pressure inside the closed storage container will rise and cause rupture or hydrogen gas explosion.

In order to prevent such a danger, a through hole 4 is provided in the center of the handling head 2 of the storage container 1 so as to penetrate the inside of the container from the top surface of the handling head, and a filter (see FIG. (Not shown)
A structure has been considered in which only gas generated in the container is released to the outside of the container and dust of radioactive material is not released.

However, in the case of such a structure,
When the filter is deteriorated, it is difficult to replace it with a new filter, and when it is necessary to highly seal the container when disposing of the storage container, it becomes difficult to highly seal the filter portion. Furthermore, there is a problem that it is difficult to cope with a case where it is necessary to inject a fluid filling into the waste in the container using the through hole of the handling head.

Accordingly, the present invention provides a filter which can release gas generated during storage as needed.
The filter can be easily replaced, and the containment performance can be reliably maintained except when the gas is released, and a high degree of sealing can be easily provided as necessary. It is an object of the present invention to provide an improved waste storage container that can be filled with a fluid filling in response.

[0007]

That is, the present invention has a gas discharge hole which penetrates into the container from the top of the handling head at the center of the handling head provided at the top of the waste container; From the large diameter part, the medium diameter part, and the small diameter part downward; the upper step between the large diameter part and the middle diameter part, and the lower step between the middle diameter part and the small diameter part, respectively. Formed; a screw-in filter provided with a gas discharge port is detachably screwed into a screw engraved on the inner periphery of a small diameter portion of the gas discharge hole so as to be locked at a lower step; Disposal with a gas discharge hole with a screw-in lid, characterized in that a screw-in lid is detachably screwed to a screw engraved on the inner periphery of the large diameter part so as to be locked at the upper step It is a thing storage container.

The above-mentioned screw-in type filter cartridge comprises a head made of a hexagonal bolt having a hollow inside, and a screw part extending downward from the head, and a hollow inside the head is provided inside the screw part. A hole communicating with the part is formed,
A filter having a structure in which a filter is fixed to the opening of the hole in the screw portion to the hollow portion in the head and a gas discharge port is opened in a part of the wall of the hollow portion in the head can be preferably used.

Further, by forming a hexagonal recess for fitting a hexagon wrench on the top surface of the screw-in type lid, the lid can be easily attached and detached.

[0010]

FIG. 1 is a longitudinal sectional view showing only an upper portion of a waste storage container according to an embodiment of the present invention.
The state in which the screw-in filter cartridge and the screw-in lid are not attached is shown. As can be seen from FIG. 1, the handling head 11
Is mounted integrally with the container, and a gas discharge hole 12 is drilled through the center of the handling head 11 to communicate with the inside of the container 10.

The gas discharge hole 12 is formed from a large diameter portion 13, a medium diameter portion 14, and a small diameter portion 15 from above to below. An upper step 16 is formed between the large diameter portion 13 and the middle diameter portion 14, and a lower step 17 is formed between the middle diameter portion 14 and the small diameter portion 15. Further, female screws 18 and 19 are formed on the inner circumference of the large diameter portion 13 and the inner circumference of the small diameter portion 15, respectively.

FIG. 2 shows a filter cartridge 20 and a screw-in lid 30 which are screwed into the gas discharge holes 12 shown in FIG.
FIG. 3 is an exploded perspective view of FIG. As can be seen from FIGS. 2 and 3, the screw-in filter cartridge 20 is screwed into the small-diameter portion 15 of the gas discharge hole 12 so as to be locked at the lower step 17 with the packing 41 interposed therebetween. Is screwed so that the screw-in type lid 30 is locked at the upper step 16 with the packing 42 interposed therebetween. Filter cartridge 2
0 is screwed into the small diameter portion 15 by screwing a male screw 23 engraved on the outer periphery of the screw portion 22 of the filter cartridge 20 into a female screw 19 on the inner periphery of the small diameter portion 15. The screwing of the lid 30 to the large diameter portion 13 is performed by screwing a male screw 31 engraved on the outer periphery of the lid 30 into the female screw 18 on the inner periphery of the large diameter portion 13. A hexagonal recess 32 for fitting a hexagon wrench is formed on the top surface of the lid 30.

FIG. 4 shows a perspective view (a) and a longitudinal sectional view (b) of the filter cartridge 20. The head 21 is made of a hexagonal bolt having a hollow inside, and extends downward from this head. And a screw portion 22. A hole 24 is formed inside the screw portion 22.
4 communicates with the hollow portion 25 in the head 21. A filter 26 is fixed to an opening of the hole 24 to the hollow portion 25, and a gas discharge port 2 is formed in a part of the wall of the hollow portion 25 in the head.
7 is opened.

When using the waste container of the present invention having the above-described configuration, the container body is cut horizontally at the upper part of the container body, similarly to the conventional container of FIG.
The filter cartridge 20 is screwed into the small-diameter portion 15 of the gas discharge hole 12 provided in the handling head 11 above the cut container. The screwing operation can be easily performed by rotating the hexagon bolt of the head 21 with a socket wrench or the like.
By controlling the tightening torque by the operation of 1, the confinement function at the time of replacing the filter cartridge can be managed. After the filter cartridge 20 is screwed into the small diameter portion 15 of the gas discharge hole 12, the gas discharge hole 1
The cover 30 is screwed into the large-diameter portion 13 of FIG. Lid 3
The screwing operation of the hexagonal recess 32 formed on the lid top surface
It can be easily performed by fitting and rotating a hexagon wrench on the, and the confinement function can be managed by controlling the tightening torque by the action of the packing 42.

On the other hand, in the lower part of the cut container, waste compacts are sequentially stacked and stored. After that, the cut surface is put on the upper part of the container, butted against each other, and the upper and lower parts of the container are fixed by welding.
The containment performance of the stored items can be secured.

In this state, when gas is generated from the waste inside the storage container while storing the container, the gas is supplied to the hole 24 of the screw portion 22 of the filter cartridge 20, the filter 26, the hollow portion 25 in the head 21, the gas discharge port. 27, and accumulates in the middle diameter portion 15 of the gas discharge hole 12. At this time, by opening the screw-in type lid 30 intentionally and releasing gas,
Pressure rise inside the container can be prevented. Even when flammable gas is generated, safety management can be performed by releasing gas before reaching the explosive limit concentration inside the container. Since the filter 26 of the filter cartridge 20 does not allow solid components such as radioactive dust to pass through, the radioactive dust can be prevented from scattering outside the container. After the gas is released, the lid 30 is screwed in to seal the large-diameter portion 13 of the gas discharge hole, so that the containment performance of the stored items can be maintained again.

If the filter 26 of the filter cartridge 20 is deteriorated or damaged, the screw-in lid 30
After removing the filter cartridge, the filter cartridge can be easily replaced by removing the filter cartridge and screwing in a new filter cartridge.

When it is necessary to inject a fluid filler such as cement into the waste stored in the storage container, the screw-in lid 30 and the screw-in filter cartridge 20 are removed. The filling can be injected from the opened gas discharge holes 12.

Further, when a high degree of sealing of the container storing the waste is required, the lid 30 attached by screwing is welded to the handling head 11 to easily and reliably perform the high level sealing. it can. The reason is that the welded part of the lid is a part where a large stress is not applied even when handling the container, and because the lid is screwed in, it is difficult to come off due to thermal deformation at the time of welding, making it possible to perform remote control welding It has become.

[0020]

As can be seen from the above description, according to the present invention, the following effects can be obtained.

(1) The filter cartridge is attached to the lower part of the gas discharge hole provided in the center of the handling head of the waste storage container, and the lid is screwed on the upper part. The gas can be released to the outside of the container and the solid component can be prevented from being diffused. When the lid is closed, the gas can be confined in the container. As a result, pressure control in the container becomes possible.

(2) Since the filter cartridge is of a screw type, even if the filter is deteriorated or damaged, the entire filter cartridge can be easily replaced.

(3) When the container needs to be highly sealed, the lid can be easily and reliably sealed by welding the lid to the handling head of the container.
In addition, since the lid is a screw-in type, it is difficult for the lid part to come off due to thermal deformation during welding, and welding by remote control can be easily performed.

(4) Since both the lid and the filter cartridge are detachable by screwing, it is possible to inject a fluid filler into the container after storing the waste as needed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing only an upper portion of a waste storage container according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which a screw-in filter cartridge and a screw-in lid are attached to the upper part of the container of FIG. 1;

FIG. 3 is an exploded perspective view of FIG. 2;

FIG. 4 is a perspective view (a) and a longitudinal sectional view (b) of a filter cartridge.

FIG. 5 is an exploded perspective view illustrating a conventional waste storage container.

[Explanation of symbols]

 10: Storage container 11: Handling head 12: Gas discharge hole 13: Large diameter part 14: Medium diameter part 15: Small diameter part 16: Upper step 17: Lower step 18: Screw on the inner circumference of the large diameter part 19: Inner circumference of the small diameter part Screw 20: Filter cartridge 21: Head of filter cartridge 22: Screw part of filter cartridge 24: Hole in screw part 25: Hollow part in head 26: Filter 27: Gas outlet 30: Lid 32: Wrench fitting Recesses 41, 42: Packing

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroshi Kojima 33, Muramatsu, Oji, Tokai-mura, Naka-gun, Ibaraki Pref. Nuclear Fuel Cycle Development Organization Tokai Works (72) Inventor Kazutomi Ishikawa, Muramatsu 4, Tokai-mura, Naka-gun, Ibaraki Prefecture No. 33 Inspection and Development Co., Ltd., Tokai Works (72) Inventor Mitsuo Sudo 4th, 33 Inspection and Development Co., Ltd., Tokai Works, Tokai Village (72) Inventor Tatsuya Negishi Tatsuya, Ibaraki Pref. 4-3 Muramatsu 33 Inspection and Development Co., Ltd. Tokai Works

Claims (3)

[Claims] 1. A gas discharge hole penetrating from the top of the handling head to the inside of the container at the center of the handling head provided on the top of the waste storage container; Formed from a middle diameter portion and a small diameter portion; an upper step is formed between the large diameter portion and the middle diameter portion, and a lower step is formed between the middle diameter portion and the small diameter portion; A screw-in filter cartridge provided with a gas outlet on a screw engraved on the inner periphery is detachably screwed so as to be locked at a lower step;
A gas discharge hole with a screw-in lid, wherein a screw-type lid is detachably screwed into a screw engraved on the inner periphery of a large diameter portion of the gas discharge hole so as to be locked at an upper step. Waste storage container equipped with. 2. The screw-in type filter cartridge comprises a head made of a hexagonal bolt having a hollow inside, and a screw part extending downward from the head. A hole communicating with the hollow part is formed, a filter is fixed to the opening of the hole in the screw part to the hollow part in the head, and a gas discharge port is opened in a part of the wall of the hollow part in the head. The storage container according to claim 1, wherein: 3. The storage container according to claim 1, wherein a hexagonal recess for fitting a hexagon wrench is formed on a top surface of the screw-in type lid.