JPH07198888A - In-reactor inspection device - Google Patents

Abstract

PURPOSE:To provide an in-reactor inspection device for inspecting the surface of reactor structures and the like in the same condition as in the air by containing the inspection device in a waterproof vessel having suckers and separation walls with waterproof lids. CONSTITUTION:The in-reactor inspection device 1 is provided with a device fixing jig 4 provided with an inspection device 5 set movably to the front and back in a waterproof vessel 2, ring shaped suckers 8 with fringe which are provided outside the lid 6 of the waterproof vessel 2, and separation walls 11 with the lid fixed with a TV camera 10 for in-water monitoring inside the lid 6, and also provides the waterproof vessel 2 with a back screw 13 and a side screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to inspection of various in-reactor equipment in reactor water in a nuclear reactor, and more particularly to an in-reactor inspection device for inspecting the surface of in-reactor equipment in the air.

[0002]

2. Description of the Related Art Regarding inspection of reactor walls and reactor internals in reactor water in the reactor, a sensor which does not need to have a special waterproof structure as a measuring device has been provided in advance in the reactor. Measurements and inspections were performed at fixed points, and the underwater camera that could be moved by remote control was used to observe the surfaces of the furnace wall and internal structures. However, the inspection device is not directly inspected by directly contacting the inspection wall with the reactor walls and reactor internals in the reactor water.

[0003]

Since the inspection of the reactor wall and the internal structure of the reactor is carried out in the reactor water from the viewpoint of preventing radiation exposure, the inspection device must be a waterproof type and can be operated remotely. Therefore, the in-furnace inspection device was likely to be large in size and was inconvenient to handle. In addition, since the measurement is performed through the reactor water, there are restrictions on the inspection items, and further, for example, when observing with a TV camera, it is difficult to obtain a fine image due to refraction and fluctuation due to the reactor water, and the measurement result. And there was a problem that the accuracy was not sufficient.

The object of the present invention is to put a checking device in a waterproof container having a suction cup and a partition wall with a waterproof lid, and to check the surface of the furnace internal structure under the same conditions as in the atmosphere. It is to provide an internal inspection device.

[0005]

In order to achieve the above object, the in-furnace inspection device according to the invention of claim 1 is a device mounting jig equipped with an inspection device installed so as to be movable back and forth in a waterproof container. A ring-shaped sucker with pleats provided on the outside of the lid of the waterproof container and a partition with a lid attached with an underwater surveillance TV camera on the inside of the lid, and a back screw and side screws provided on the waterproof container It is characterized by that.

According to a second aspect of the present invention, there is provided a device mounting jig for an in-furnace inspecting device, comprising: a first frame having wheels mounted on rails laid inside a waterproof container; and a first frame mounted on the first frame. A second frame that slides in the direction, a third frame that slides on the second frame in a direction perpendicular to the movement of the second frame, and a device mounting base of the inspection device that rotates on the third frame. Is characterized by.

The partition wall with lid of the in-core inspection device according to the third aspect of the present invention is a lid that slides along a guide groove on one side of the lid and faces a ring-shaped groove provided around the central hole of the lid. It is characterized by comprising a slide lid made of a main body and a rubber sheet, a screw rod and a guide rod rotated by a drive motor that supports and slides the slide lid, and a suction tube connected to the ring-shaped groove.

The partition wall with lid of the in-furnace inspection device according to the invention as claimed in claim 4 is a rubber sheet having a circular hole partially attached to one side of the lid so as to face the ring-shaped groove provided around the central hole. Also, a winding device, and a pressing plate and a pressing spring having a hole at the center for pressing the rubber sheet on the rubber sheet at the central hole portion are provided.

[0009]

According to the first aspect of the present invention, in the in-reactor inspection device, the partition wall with the lid is initially closed to make the inside of the waterproof container watertight, and the rear screw and the side screw are operated in the reactor water under the guidance of the underwater monitoring TV camera. And move it to the inspection surface.
Next, the back screw presses the pleated ring-shaped suction cup of the in-furnace inspection device against the inspection surface, the side screw secures the verticality with the inspection surface, and the pleated ring-shaped suction cup secures the inspection surface.

After this, the reactor water in the space of the ring-shaped suction cup with pleats is discharged and replaced with air, the partition wall with lid is opened, the underwater surveillance TV camera is moved, and in the air through the central hole. The inspection surface is inspected by the inspection device.

According to the second aspect of the present invention, the distance between the inspection device and the inspection surface is moved back and forth by the first frame by means of the device mounting jig. For example, the second frame is slid horizontally and vertically. This is done by sliding the third frame. Further, by rotating the device mount, the inspection device mounted on the device mount can be positioned at a predetermined position on the inspection surface.

According to the third aspect of the present invention, by rotating the screw rod by the drive motor of the partition wall with the lid, the slide lid is slid along the guide groove and the guide rod, and the rubber sheet of the slide lid and the ring of the lid. The watertight container is kept watertight by closing the central hole with the groove.

In a fourth aspect of the invention, a rubber sheet partially having a circular hole is wound by a winding device for a partition with a lid, and a central hole is provided at a position without the circular hole of the rubber sheet and a ring-shaped groove of the lid. To keep the waterproof container watertight.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in the vertical sectional view of FIG. 1 and the front view of FIG. 2, the in-furnace inspection device 1 is installed in a cylindrical waterproof container 2 along a rail 3 so as to be movable back and forth as indicated by an arrow. A jig 4 and an inspection device 5, which is a measuring device according to the purpose of inspection, are attached to the front of the jig 4.

A pleated ring-shaped suction cup 8 for adsorbing to the inspection surface 7 in the furnace is provided on the outer surface of one lid 6 of the waterproof container 2, and a plurality of folds are provided on the inner circumference. The light 9 is attached. Inside the lid 6, inside the waterproof container 2, a partition wall with a lid attached with an underwater surveillance TV camera 10
11 is installed, and normally the central hole 12 of the lid 6 is closed to keep the inside of the waterproof container 2 watertight.

Further, on the opposite side of the lid 6 in the waterproof container 2,
A back screw 13 for forward / backward movement of the in-furnace inspecting apparatus 1 and side screws 14 for moving the in-reactor inspecting apparatus 1 in the left / right and up / down directions by changing the direction are installed on both sides.
Further, the lid 6 has a suction drainage pipe 15 communicating with the pleated ring-shaped suction cup 8, a drainage pipe 17 communicating with a space 16 formed by the pleated ring-shaped suction cup 8, and a high-pressure air pipe 1.
8, the suction tube 1 connected to the ring-shaped groove of the partition wall 11 with a lid
9 and a cable 20 for remote control, etc. are connected.

As for the device mounting jig 4, as shown in the front view of FIG. 3, the first frame 22 to which the wheel 21 that is movable on the rail 3 laid inside the waterproof container 2 is mounted.
On this first frame 22, a second frame 23 that slides horizontally in one direction, for example, as shown by an arrow, and a second frame 23.
It is composed of a third frame 24 that slides in the direction perpendicular to the movement of the second frame 23, for example, in the vertical direction indicated by the arrow, and further, on the third frame 24, a device mounting base 25 that is rotatable. . In addition, various measuring devices such as an in-air TV camera and an ultrasonic inspecting device of the inspection device 5 according to the inspection contents are installed on the device mount 25.

As shown in the front view of FIG. 4 and the sectional view taken along the line AA in FIG. 4 of FIG. 5, the partition 11 with the lid has a slightly different structure depending on the contents of the inspection performed by the inspection device 5, but the central A slide lid 26 to which the underwater surveillance TV camera 10 is attached is provided. This slide lid 26 is a lid body 27
And a rubber sheet 28, and a ring-shaped groove 29 is formed on the surface facing the rubber sheet 28 around the central hole 12 of the lid 6.
Is provided, and the suction pipe 19 is connected to the ring-shaped groove 29.

The slide lid 26 has a screw rod 32 which is rotated by a drive motor 31 in a guide groove 30 formed in the lid 6.
By being supported by a guide rod 33 so as to be slidable up and down in the direction of the arrow, and by making the inside of the ring-shaped groove 29 a negative pressure by the suction tube 19, the central hole 12 of the lid 6 is made a television camera for underwater monitoring. It is configured to close with 10.

Next, the operation of the above configuration will be described. Regarding the in-furnace inspection device 1, the underwater monitoring TV camera 10 of the partition wall 11 with a lid is aligned with the position of the central hole 12, and the air in the ring-shaped groove 29 is sucked through the suction pipe 19 to form the ring-shaped groove 29.
The inside of the waterproof container 2 is made watertight by making the inside a negative pressure and bringing the rubber sheet 28 of the lid main body 27 into close contact with the lid 6.

In this state, the in-reactor inspection device 1 is put in reactor water of the nuclear reactor, the light 9 is turned on, an operation signal is sent through the cable 20, and the rear screw 13 and the rear screw 13 are guided by the underwater monitoring TV camera 10. The side screw 14 is operated to guide it to the predetermined inspection surface 7 of the furnace wall and the furnace internals.
When the in-furnace inspection device 1 reaches the inspection surface 7, the rear screw 13 while watching the image from the underwater monitoring TV camera 10.
Thus, the pleated ring-shaped suction cup 8 of the in-furnace inspection device 1 is pressed against the inspection surface 7, and the side screw 14 secures the verticality with respect to the inspection surface 7.

After this, the reactor water in the pleated ring-shaped suction cup 8 is sucked and discharged from the suction / drain pipe 15 communicating with the pleated ring-shaped suction cup 8 and the inside of the pleated ring-shaped suction cup 8 is subjected to a negative pressure. Adsorb to 7 and fix the in-furnace inspection device 1. This state is maintained until the inspection of the inspection surface 7 is completed.

Next, high-pressure air is sent from the high-pressure air pipe 18 to the space 16 formed by the ring-shaped suction cup 8 with pleats, and the reactor water accumulated in the space 16 is discharged by the drain pipe 17 to remove the space 16 from the space 16. Replace with air. After this, the negative pressure in the ring-shaped groove 29 is released, the drive motor 31 of the partition 11 with the lid is operated,
The slide lid 26 is opened and the underwater surveillance TV camera 10
Is moved from the central hole 12 and the inspection surface 7 and the inspection device 5 are directly opposed to each other in the air through the central hole 12 of the lid 6.

The inspection work on the inspection surface 7 is performed by the inspection device 5 which is previously attached to the device mounting base 25 of the device mounting jig 4 in accordance with the inspection content. For visual inspection, use a general in-air TV camera or camera, for surface condition inspection, TV camera together with ultrasonic type surface inspection device, and for material inspection, stress measuring device, etc. Apply equipment.

The positioning of the inspection device 5 with respect to the inspection surface 7 is performed by moving the device mounting jig 4 back and forth on the rail 3 by means of the wheels 21 as well as by the second frame 23 and the third frame.
By rotating the device mount 25 on the third frame 24 in the vertical and horizontal directions by 24, the optimum positioning for inspection work can be accurately and easily performed.

After the inspection on the original inspection surface 7 is completed,
When the in-reactor inspection device 1 is moved with respect to another inspection surface 7 that is the furnace wall and the in-reactor structure, once the device mounting jig 4 is moved along the rails 3 such as the center of gravity in the reactor water. After moving to a suitable predetermined standby position, the drive motor 31 of the partition wall 11 with a lid is operated, the slide lid 26 is closed, and the TV camera 10 for underwater monitoring.
Is aligned with the central hole 12, and the air in the ring-shaped groove 29 is sucked by the suction pipe 19 to a negative pressure, and the rubber sheet 28 of the lid main body 27 is
The inside of the waterproof container 2 is made watertight by bringing the and the lid into close contact with the lid 6.

Next, the high pressure air in the space 16 is supplied to the high pressure air pipe 18
And the reactor water is introduced from the drain pipe 17 to replace the space 16 with the reactor water. After that, when the negative pressure in the pleated ring-shaped suction cup 8 is released by the suction drainage pipe 15 and the reactor water is injected, the in-reactor inspection device 1 is detached from the inspection surface 7. After that, the light 9 is turned on and the operation signal from the cable 20 causes
Under the guidance of the underwater monitoring TV camera 10, the rear screw 13 and the side screw 14 are operated to move the in-core inspection device 1 to the next inspection surface.

In the present invention, the inspection surface 7 of the reactor wall and the reactor internals which is always installed in the reactor water is directly measured in detail in the air by remote control without radiation exposure of workers. Therefore, clear information can be obtained without being affected by refraction and fluctuations caused by the reactor water, for example, as viewed by an underwater television camera in which the reactor water is interposed. Further, the inspection of the inspection surface 7 can be performed in the air, and moreover, by supplying the high pressure air from the high pressure air pipe 18 for a slightly long time,
Since the inspection surface 7 can be observed in a sufficiently dry state,
Further detailed inspection is possible.

In the above embodiment, the inspection device 5 is explained as a single function, but the first frame of the device mounting jig 4 is described.
By installing multiple inspection devices and tools on the 22 and the second frame 23, and the third frame 24 or the device mounting base 25, multiple types of inspection work can be performed continuously by one operation in the reactor water and adhesion of the inspection surface. Can be implemented.

Another embodiment of the partition with a lid is shown in the front view of FIG. 6 and the sectional view taken along the line BB of FIG. 6 of FIG. The partition wall 34 with a lid faces a ring-shaped groove 29 provided around the central hole 12 inside the lid 6, and a rubber sheet 36 having a circular hole 35 in a part thereof is attached together with a winding device 37. A pressing plate 38 having a hole formed in the center from the top of the sheet 36 and a pressing spring 39 are pressed against the ring-shaped groove 29 of the lid 6.

In order to seal the waterproof container 2 with the partition 34 with the lid, the rubber sheet 36 is wound by the winding device 37 so that the central hole 12 of the lid 6 does not have the round hole 35 of the rubber sheet 36. Cover with parts. Next, inside the ring-shaped groove 29, the suction tube
When a negative pressure is applied by 19, the rubber sheet 36 is sucked and adheres to the lid 6 and closes the central hole 12, so that the inside of the waterproof container 2 is kept watertight.

When the inspection is carried out, after replacing the reactor water outside the lid 6 with air, the negative pressure in the ring-shaped groove 29 is released, the rubber sheet 36 is wound up by the winding device 37, and the round hole 35 is formed.
Align with the 12 central holes. As a result, the inside of the waterproof container 2 communicates with the outside through the central hole 12. The partition 34 with a lid has a simple structure and can be easily miniaturized.

Another embodiment of the ring-shaped sucker with pleats is shown in FIG.
In a plan view. In the in-furnace inspection device 40, the shape of the pleated ring-shaped suction cup 41 is made to be a deformed ring shape matching the shape when the inspection surface 42 is, for example, a cylindrical shape. As a result, the in-reactor inspection device 40 is firmly fixed to the inspection surface 42, the reliability of the adsorption portion is improved, and the reactor water is prevented from leaking inside.

[0034]

As described above, according to the present invention, the inspection of the reactor wall, the reactor internal structure and the like can be performed in the nuclear reactor with the inspection surface in the air, so that the accuracy is improved and the inspection device is improved. Since it is not necessary to use a waterproof type for the various measuring instruments, it is easy to miniaturize and has the effect of improving reliability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an in-furnace inspection device according to an embodiment of the present invention.

FIG. 2 is a front view of an in-furnace inspection device according to an embodiment of the present invention.

FIG. 3 is a front view of a device mounting jig according to an embodiment of the present invention.

FIG. 4 is a front view of a partition wall with a lid according to an embodiment of the present invention.

5 is a partition wall with a lid according to an embodiment of the present invention, which corresponds to FIG.
-A arrow sectional view.

FIG. 6 is a front view of another embodiment of the partition with the lid according to the present invention.

FIG. 7 is a sectional view taken along the line BB of FIG. 6 showing another embodiment of the partition with a lid according to the present invention.

FIG. 8 is a plan view of another embodiment of the ring-shaped suction cup with pleats according to the present invention.

[Explanation of symbols]

1,40 ... Inspection device in the furnace, 2 ... Waterproof container, 3 ... Rail, 4
... Device mounting jig, 5 ... Inspection device, 6 ... Lid, 7, 42 ... Inspection surface, 8, 41 ... Ring-shaped suction cup with pleats, 9 ... Light, 10 ...
Underwater surveillance TV camera, 11, 34 ... Partition wall with lid, 12 ... Central hole, 13 ... Rear screw, 14 ... Side screw, 15 ...
Suction / drainage pipe, 16 ... Space part, 17 ... Drainage pipe, 18 ... High pressure air piping, 19 ... Suction pipe, 20 ... Cable, 21 ... Wheel, 22 ... First frame, 23 ... Second frame, 24 ... Third frame , 25 ... Device mount, 26 ... Slide lid, 27 ... Lid body, 28, 36 ... Rubber sheet, 29 ... Ring groove, 30 ... Guide groove, 31 ... Drive motor, 32 ... Screw rod, 33 ... Guide rod, 35 ... Round hole, 37 ... Winding device, 38 ... Pressing plate, 39 ... Pressing spring.

Claims (4)

[Claims] 1. A device mounting jig having an inspection device mounted so as to be movable back and forth in a waterproof container, a ring-shaped suction cup with a fold provided outside the lid of the waterproof container, and underwater monitoring inside the lid. An apparatus for inspecting a furnace, wherein a partition with a lid to which a television camera for a television is attached is installed, and a rear screw and a side screw are provided on the waterproof container. 2. A device mounting jig for mounting an inspection device installed so as to be movable back and forth in a waterproof container, a first frame having wheels mounted on rails laid inside the waterproof container, and the first frame. A second frame that slides in one direction on the frame, a third frame that slides on the second frame in a direction perpendicular to the movement of the second frame, and a device mounting of the inspection device that rotates on the third frame. The in-furnace inspection device according to claim 1, wherein the inspection device comprises a table. 3. A lid in which a partition with a lid mounted inside the lid of a waterproof container slides along a guide groove on one side of the lid and faces a ring-shaped groove provided around the central hole on the surface of the lid. A slide lid including a main body and a rubber sheet, a screw rod and a guide rod rotated by a drive motor that supports and slides the slide lid, and a suction tube connected to the ring-shaped groove. In-furnace inspection device according to 1. 4. A rubber sheet having a circular hole in a part thereof, wherein a partition wall with a lid attached to the inside of a lid of a waterproof container faces a ring-shaped groove provided around the central hole on one side of the lid and has a circular hole. 2. The in-reactor inspecting apparatus according to claim 1, further comprising: a take-out device, and a pressing plate and a pressing spring having a hole at the center for pressing the rubber sheet onto the rubber sheet at the central hole portion.