JPH09281299A - Device for confining and inspecting glass solidified body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect a sucked material in a detector without depositing it and to provide a device for confining and inspecting a glass solidified body without need to remove a deposit. SOLUTION: An inspection vessel 11 and a pipeline 15 leading to a detector 16 are made into a double structure, an air blowoff hole 18 is formed in the wall of the inner pipe 15b, and air is supplied between the inner and outer pipes from a blower 19 as an air supply mechanism. Consequently, the supplied air is blown off along the wall of the inner pipe 15b to form a boundary layer 20, hence the deposition of the sucked material on the wall of the inner pipe 15b is prevented, all the materials sucked from the instection vessel 11 are collected by the detector 16, and minute leakage is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vitrified body confinement inspecting apparatus for inspecting leakage from vitrified solids that contain high-level radioactive waste generated in nuclear facilities, and a suction substance is attached to a pipe wall. It is designed to be able to be caught by the detector without any need.

[0002]

2. Description of the Related Art Radioactive pollutants generated from nuclear facilities such as spent fuel reprocessing are hermetically sealed and stored in a container according to the level of radioactivity, and high concentrations of radioactive pollutants are converted into vitrified substances. It is stored in a vitrified container and stored and managed.

The vitrified body container containing such a high-concentration radioactive pollutant is welded and hermetically sealed after the vitrified body is put in, and the presence or absence of radioactive pollutants adhering to the outside of the vitrified body container. Etc. are inspected, and if radioactive contaminants are attached, they are removed by a removal device, and the sealed state is inspected by a vitrified substance confinement inspection device before storage.

As shown in FIG. 2, for example, the vitrified body confinement inspecting apparatus allows a plurality of (for example, three) vitrified material containers 2 to be housed in a sealed inspection container 1, and the inspection container 1 The air in the inspection container 1 is sucked from the air outlet pipe 4 in the center through the pipe 5 and the detector 6 such as a filter while introducing the outside air from the air inlet pipe 3 provided so as to communicate with the three outer circumferences. The device 7 is adapted to suck. In the inspection, suction is performed for about half a day by the suction device 7, and the suction substance trapped by the filter of the detector 6 is inspected to inspect the minute leakage from the welded portion of the vitrified body container 2 or the like. There is.

[0005]

However, in such a vitrified body confinement inspection device, the air in the inspection container 1 is sucked from the air outlet pipe 4 for inspection, but a part of the sucked substance is in the inspection container 1. May be attached to the inner wall of the pipe 5 that connects the detector 6 provided with a filter and the like, and may not be caught by the detector 6 and leak may not be detected.

Further, even if an attempt is made to remove the suction substance attached to the inner wall of the pipe 5, the inspection chamber in which the inspection container 1 is installed and the measurement chamber in which the detector 6 and the like are installed are connected to each other by piping. It cannot be removed easily.

The present invention has been made in order to solve the problems of the conventional concept, and is a vitrified body which can be trapped by a detector without adhering a suction substance and does not require removal of a deposit. It is intended to provide a containment inspection device.

[0008]

In order to solve the above-mentioned problems, the vitrified body confinement inspection device of the present invention sucks up to the detector while introducing outside air into the inspection container in which the vitrified body container is housed. In a vitrified body confinement device for inspecting leakage from a vitrified body container, a pipe connecting the inspection container and the detector has a double pipe structure, and an air blowout hole is formed in a pipe wall of the inner pipe, It is characterized in that an air supply mechanism is connected to supply air for blowing to the inner and outer tubes to prevent deposits on the inner tube wall.

Here, the air blowout hole formed in the pipe wall of the inner pipe is a case where the pipe is made of a porous sintered body or the like, and the porous portion is used as an air blowout hole, or the pipe wall made of metal or the like. This is a case where the holes formed by machining or the like are used as air blowing holes.

According to this vitrified solids confinement inspection device, the pipe from the inspection container to the detector has a double pipe structure,
Moreover, an air blowing hole is formed in the tube wall of the inner tube, and air is supplied from the air supply mechanism between the inner and outer tubes.
The supplied air is blown out along the inner wall of the inner tube to form a blowout boundary layer, which prevents the suction substance from adhering to the inner wall of the inner tube and sucks it from the inside of the inspection container. All the aspirated substances that are used are captured by the detector.

Further, in the vitrified body confinement inspection device according to the present invention, in addition to the constitution described in claim 1, the air outlet pipe in the inspection container for accommodating the vitrified substance container has a double pipe structure, and the air supply is provided. It is characterized in that the air for blowing out from the mechanism can be supplied.

According to the vitrified body confinement inspection device, the air outlet pipe for sucking the air in the inspection container is also provided with a double pipe structure to supply the air, so that the suction substance is more reliably attached. So that it can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall schematic cross-sectional view and an enlarged cross-sectional view of only a pipe according to an embodiment of a vitrified body confinement inspection device of the present invention.

This vitrified solids confinement inspection device 10 has the same main structure as that described with reference to FIG. 2, so that a plurality of vitrified solids containers 12 can be housed in a sealed inspection container 11. While introducing the outside air from the air inlet pipe 13 provided so as to communicate with a plurality of outer circumferences of the inspection container 11, the air in the inspection container 11 is fed from the air outlet pipe 14 at the center through the pipe 15 to a filter or the like. The suction device 17 sucks the gas through the detector 16.

Further, in the vitrified body confinement inspection device 10, the pipe 15 from the air outlet pipe 14 to the detector 16 is constituted by a double pipe as shown in FIG. 1 (b),
An outer pipe 15a and an inner pipe 15b are provided. The outer pipe 15a is made of metal or the like, while a large number of air blowing holes 18 are formed in the wall of the inner pipe 15b. This air blowing hole 18
Is made porous by forming the inner tube 15b with a sintered body,
The porous portion is used to function as the air blowing hole 18, or the inner pipe 15b is made of metal or the like, and a large number of small holes are formed by machining or the like to form the air blowing hole 18. It is formed by

Then, one end of the inner pipe 15b of the double pipe 15 from the outside of the side wall of the inspection container 11 to the detector 16 is communicated with the air outlet pipe 14, and the other end is communicated with the detector 16. One end of the outer tube 15a is welded to the side wall of the inspection container 11 in a sealed state, and the other end of the outer tube 15a is similarly welded to the side wall of the detector 16 in a sealed state.

Therefore, the outer side of the pipe 15 is the outer pipe 15a.
While the inside of the pipe 15 is completely sealed, the inside of the pipe 15b is in communication with the inside and outside of the inner pipe 15b through the air blowing hole 18.

Therefore, a blower 19 which is an air supply mechanism for supplying air for blowing is connected to the pipe wall of the outer pipe 15a of the pipe 15, and air is supplied to the space 15c between the inner and outer pipes.
The air is blown out from the air blowing hole 18 into the inner pipe 15b. Then, the air exuding from the air blowing hole 18 forms a blowing boundary layer 20 along the tube wall of the inner tube 15b, whereby the suction substance in the suction air from the inspection container 11 flowing in the inner tube 15a is attached. Prevent.

For this reason, the pressure of the blowing air supplied from the blower 19 which is an air supply mechanism is always kept high between the inner and outer tubes with respect to the suction pressure in the inner tube 15b.

In the vitrified body confinement inspecting apparatus 10 having the above-described structure, a plurality of vitrified body containers 12 are housed in the inspection container 11 to be in a hermetically sealed state during the inspection, and the air between the inner and outer pipes of the pipe 15 is sealed. Air for blowout is supplied by a blower 19 which is a supply mechanism to exude air from a large number of air blowout holes 18 in the tube wall of the inner tube 15a,
The exudation boundary layer 20 is formed.

After that, the air in the inspection container 11 is constituted by a double pipe from the air outlet pipe 14 in the central portion while introducing the outside air from the air inlet pipe 13 provided so as to communicate with a plurality of outer circumferences of the inspection container 11. The detector 16 is sucked by the suction device 17 via the inner pipe 15b of the pipe 15.

Then, after suctioning for a predetermined time, for example, about half a day, the suction is stopped, and the suction substance trapped by the filter of the detector 16 is inspected to determine whether or not there is a slight leak from the welded portion of the vitrification container 12. To inspect.

At this time, even if there is any suction substance from the inspection container 11, the seepage boundary layer 20 is formed on the inner side of the inner wall of the inner pipe 15b of the pipe 15, so that the adhesion is prevented and the suction substance is prevented. Can be detected by the detector 16, and it is possible to detect the presence or absence of minute leakage from the vitrified material container 12.

Further, since the suction substance does not adhere to the inner wall of the inner pipe 15b of the pipe 15, it is not necessary to remove it.

Further, in the vitrified body confinement inspection device 10, the pipe 1 for connecting the inspection container 11 and the detector 16 to each other.
Although 5 has a double-pipe structure to exude air to prevent the suction substance from adhering, the air outlet pipe 14 in the inspection container 1 also has a double-pipe structure to communicate with the pipe 15 to attach the suction substance. May be prevented, and the adhesion can be prevented more completely.

[0026]

As described in detail with one embodiment, the vitrified body confinement inspection device of the present invention has a double pipe structure between the inspection container and the detector, and Air blowout holes are formed on the wall of the pipe,
Air is supplied from the air supply mechanism between the inner and outer tubes, and the supplied air is blown out along the tube wall of the inner tube to form a blow-out boundary layer. It is possible to prevent all the sucked substances sucked from the inside of the inspection container by the detector by preventing the inner tube from adhering to the inner wall, and it is possible to detect a minute leak.

Further, according to the vitrified body confinement inspection device of the second aspect of the present invention, the air outlet pipe for sucking the air in the inspection container also has a double pipe structure to supply air. Further, it is possible to more reliably prevent the suction substance from adhering.

Further, in any of these inventions, the suction substance to the pipe is eliminated, and the removal work is unnecessary.

[Brief description of drawings]

FIG. 1 is an overall schematic cross-sectional view and an enlarged cross-sectional view of a pipe according to an embodiment of a vitrified solid confinement inspection device of the present invention.

FIG. 2 is a schematic configuration diagram of a vitrified body confinement inspection device that has been considered so far.

[Explanation of symbols]

 10 Vitrified Solid Confinement Inspection Device 11 Inspection Container 12 Vitrified Solid Container 13 Air Inlet Pipe 14 Air Outlet Pipe 15 Piping 15a Outer Pipe 15b Inner Pipe 15c Between Inner and Outer Pipe 16 Detector 17 Blower (Suction Device) 18 Air Blowhole 19 Blower (Air supply mechanism for blowing air) 20 Bleed boundary layer

Claims (2)

[Claims] 1. A vitrified material confinement device for inspecting leakage from a vitrified material container by introducing the outside air into the inspection container in which the vitrified material container is housed and sucking it to a detector to inspect for leakage from the vitrified material container. The pipe that connects the detector has a double-pipe structure, and the air blowout hole is formed in the inner wall of the inner pipe, and the air for blowing out is supplied to the inner and outer pipes to prevent the deposits on the inner pipe wall. A vitrified body confinement inspection device characterized in that a supply mechanism is connected. 2. The air outlet pipe in the inspection container in which the vitrified substance container is housed has a double pipe structure, and blown air from the air supply mechanism can be supplied. Vitrified solids confinement inspection device.