JPH1090493A - Device for demolishing nuclear reactor remotely - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for demolishing a nuclear reactor remotely which makes it possible to smoothly load and unload moving devices for cutting and gripping work of a remotely demolishing device from the outside to the inside of a reactor room and easily isolate the inside of it from the outside and can shorten the time for demolishing work. SOLUTION: A demolishing device is constituted by installing a moving device 14 for cutting work and a moving device 15 for gripping work individually on a center pole 12 at intervals. The moving device 14 for cutting work consists of a cutting mechanism section 18 and a cutting device drive section 20. The cutting mechanism section 18 is composed of a support arm 17 for cutting work whose tip is equipped with a cutting torch for cutting and demolishing in-vessel structures such as a pressure vessel. The cutting device drive section 20 supports and drives the support arm 17 for cutting work. The moving device 15 for gripping work consists of a gripping mechanism section 23 and a gripper drive section 25. The gripping mechanism section 23 is composed of a support arm 22 for gripping work with a squeezing part provided at its tip to grip demolished objects cut by the cutting torch. The gripper drive section 25 supports and drives the support arm 22 for gripping work. A nuclear reactor is demolished by a remote controller 26 outside a reactor room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a remote dismantling apparatus for a nuclear reactor, which cuts and disassembles a reactor internal structure such as a reactor vessel and transports the cut disassembly outside a reactor chamber in a nuclear reactor facility.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional remote dismantling apparatus for a nuclear reactor. Dismantling of reactor internals such as reactor pressure vessels
In order to handle dismantled materials contaminated with radioactivity in the furnace chamber, the dismantling device is remotely controlled from outside the furnace chamber. FIG. 4 shows an example of a conventional method for dismantling a nuclear reactor, which is intended for a gas-cooled nuclear reactor. The dismantling operation is performed by mounting a remote dismantling device 3 that is operated and operated from outside the furnace chamber (not shown) on a cart 2 that runs on a rail provided in a biological shielding floor opening 1 that opens in the upper part of the furnace chamber. The remote dismantling device 3 is provided with a cutting and moving device 5 provided with a cutting torch 4 for cutting and dismantling at a predetermined position. The cutting and moving device 5 is lowered into a furnace chamber, and a gas flame is generated from the cutting torch 4. , A plasma flame, etc., to cut and dismantle the reactor internals such as the reactor pressure vessel 6, etc., and an overhead crane 7 provided on the upper part outside the reactor chamber and a disassembly disassembly provided on this overhead crane 7 This is a method in which the object is taken out of the furnace chamber by the gripping moving device 9 including the gripping jig 8 for hanging the object, and transported to a predetermined storage location. The overhead traveling crane 7 and the remote dismantling device 3 are used to prevent the contaminated atmosphere in the furnace chamber from expanding and shield the activated reactor internals for the reactor dismantling operation.
Is provided with a shielding facility 10 made of concrete, lead or iron, which covers the entire moving range.

[0003]

By the way, in the conventional dismantling method of a nuclear reactor, the cutting and moving device of the remote dismantling device and the moving device for grasping are inserted through a large opening provided in a living body shielding floor above the furnace chamber. Then, the reactor internal structure such as the reactor pressure vessel is cut and dismantled and the dismantled material is taken out. Therefore, at the time of the cutting and dismantling work and the work of taking out the dismantled material, there is a possibility that the contaminated atmosphere in the furnace chamber may be diffused outside the furnace chamber and expanded, and a large-scale shielding facility for covering the entire remote dismantling apparatus is required. In addition, during maintenance and inspection of a movable dolly and a remote dismantling device, it is difficult to completely shield the above-mentioned biological shield floor opening at the upper part of the furnace, so that the inspection worker approaches the upper part of the furnace. There was also a problem that they could not work.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to easily move a cutting and moving device for a remote dismantling device into and out of a furnace chamber from outside the furnace chamber, and to isolate the furnace room from the outside of the furnace chamber. Another object of the present invention is to provide a remote dismantling device for a nuclear reactor that can reduce the dismantling work time.

[0005]

In order to solve the above-mentioned problems, the present invention provides a cutting moving device in which one end is formed on a peripheral surface of a center pole inserted into a furnace chamber through an opening of a living body shielding floor into a furnace chamber. A connected cutting support arm that expands and contracts in the longitudinal direction, a cutting torch rotatably connected to the other end of the cutting support arm, and a cutting mechanism that supports and rotates the cutting torch in an arbitrary posture. A cutting device driving unit for vertically moving and turning the cutting support arm in a vertical direction and positioning the cutting support arm at an arbitrary position in the furnace chamber, wherein a gripping moving device is provided with a space between the cutting support arm and the center pole. A gripping support arm having one end connected to a peripheral surface of the gripping arm and a gripping arm which is rotatably connected to the other end of the gripping support arm and rotatably connected to the other end of the gripping arm and cut by the cutting torch; And a holding mechanism for supporting and rotating the holding portion in an arbitrary posture, and a holding device driving portion for moving the holding support arm up and down and rotating vertically to position the holding arm at an arbitrary position in the furnace chamber. To

[0006] Thereby, the moving device for cutting and the moving device for gripping of the remote dismantling device can be carried in from the furnace upper wall portion of the small opening via the center pole, so that the expansion range of contamination outside the furnace chamber is reduced. be able to. In addition, since the moving device for cutting and the moving device for gripping can be moved up and down separately by the same supporting arm for cutting and gripping with the same center pole axis, dismantling and gripping of the dismantled object are performed in parallel and at the working position. And so on.
Dismantling work can be performed efficiently in a short time. Also,
By disposing a plurality of center poles provided with the moving device for cutting and the moving device for gripping in the furnace chamber to constitute a remote dismantling device, dismantling work can be further shortened.

[0007] Further, a transport basket for storing the cut dismantled material transported by the gripping and moving device, a transport crane for taking out the disassembled material stored in the transport basket out of the furnace chamber and transporting the dismantled material, By providing a dust-proof cell that covers the transfer path, it is possible to prevent radioactive contamination of the surroundings by dismantling during transfer, and furthermore, the core structure is provided between the living body shielding opening and the opening of the transfer basket outside the furnace chamber. By installing a shielding hatch that shields the radiation from outside and a greenhouse outside the furnace room that covers the biological shield floor opening, the effect of preventing the spread of contamination can be improved. Exposure can be reduced.

[0008] By providing the local dust collection device in the furnace chamber, it is possible to collect secondary dust such as cutting dust and fumes generated during the cutting and dismantling of the nuclear reactor, thereby further preventing the diffusion of contamination. it can.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIGS. 1 and 2 show a remote dismantling apparatus according to a first embodiment of the present invention. FIG. 1 is a configuration diagram of a remote dismantling apparatus installed in a furnace chamber, and FIG. 2 is a center pole. 3A is a detailed view of the remote dismantling device mounted on the vehicle, FIG. 3A is a perspective view, and FIG. FIG. 1 shows a state in which a stand pipe 11 for taking in / out of fuel or inserting a control rod is disassembled from a pressure vessel 6 and installed in a biological shield floor opening 1 in an upper part of a furnace chamber. One hollow cylindrical center pole 12 is inserted into the pressure vessel 6 in the furnace chamber from the small opening of the group 11 and the other end is supported by the support grit 1 of the core.
3 is fixedly supported. And this center pole 1
2 is provided with a cutting moving device 14 for cutting and dismantling the internal structure of the reactor constituting the remote dismantling device, and a grasping moving device 15 for grasping the dismantled dismantled reactor and transferring it to a predetermined position. I have.

The detailed structure of the cutting moving device 14 is as follows.
As shown in FIG. 2A, a cutting support arm 17 extending in the radial direction of the center pole 12 is connected to a connecting portion 16 fitted to the center pole 12 with a screw 16a. A cutting mechanism 18 comprising a cutting torch 18a for irradiating a gas flame or a plasma flame provided at the tip of the cutting part, and the cutting mechanism screwed into the center groove 12a of the center pole in contact with the lower part of the connecting part 16. And a cutting device drive unit 20 that supports and drives the support arm 17. The cutting support arm 17 is provided with a telescopic support 19 for connecting the connecting portion 16 and the cutting support arm 17 by screw connection.

The gripping moving device 15 constituting the remote dismantling device is installed at a predetermined distance coaxially with the center pole 12 on which the cutting moving device 14 is provided. And a driving mechanism similar to that described above. That is, the gripping moving device 15 connects the gripping support arm 22 extending in the radial direction to the connecting portion 21 fitted at a predetermined distance to the connecting portion 16 provided on the center pole 12 with the screw 21a. A gripping mechanism 23 comprising a gripping portion 23a having a claw that opens and closes at the tip of the gripping support arm 22; and the gripping portion which is in contact with the connecting portion 21 and is screwed into the thread groove 12a of the center pole 12. And a holding device driving unit 25 that supports and drives the holding support arm 22. The holding support arm 22 is provided with a telescopic support for connecting the connecting portion 21 and the holding support arm 22. Have been.

The driving of the components of the cutting moving device 14 and the gripping moving device 15 is controlled by a remote control device 26 provided outside the furnace chamber shown in FIG. The wiring of the power supply line and the control line for driving and controlling the above-described respective components and the wiring of the gas pipe or the power supply for the cutting torch described later are made from outside the furnace chamber through the hollow portion 12b of the center pole 12. I have. Under the control from the remote control device 26, the cutting torch 18a of the cutting mechanism 18 and the holding portion 2 of the gripping mechanism 23 as shown in FIG.
The refraction, rotation, rotation, and gripping movement of 3a are performed by a drive device such as a rotary drive or a solenoid valve of the cutting mechanism 18 and the gripping mechanism 23 (not shown). The cutting support arm 17 and the gripping support arm 2 are expanded and contracted by telescopic supports 19 and 24 provided in the center pole 12 in the radial direction.
2 and the cutting mechanism 18 and the gripping mechanism 23 perform a vertical undulating movement. Then, the cutting support arm 17 and the gripping support arm 22 are moved up and down in the vertical direction of the center pole 12 or swiveled in the left and right direction by the driving of the cutting device driving unit 20 and the gripping device driving unit 25 having the rotating mechanism. The cutting torch 18a of the cutting mechanism 18 and the holding portion 23a of the gripping mechanism 23 are positioned at arbitrary positions in the room.

As shown in FIG. 1, a local dust collecting device 27 is installed in the furnace chamber. The local dust collecting device 27 is generated by the cutting torch 18a of the cutting mechanism 18 of the moving device 14 for cutting and dismantling. Cutting dust and fumes are collected at the cutting source. The above-mentioned dismantling operation is remotely monitored by a furnace observation device (not shown).

In the furnace chamber, a transport basket 29 is provided on a disassembled material carrying-out stand 28, and a cut piece obtained by cutting the disassembled material with a cutting torch 18a is held by a holding portion 23a of a gripping mechanism 23. Then, the gripping mechanism 23,
The disassembled object is moved to the above-mentioned disassembled product carrying stand 28 by the driving of the gripping device drive unit 25, the gripping support arm 22, the telescopic support 24, and the gripping device drive unit 25, is stored in the transport basket 29, and then is transported by the transport crane 30 It is lifted and moved in the dustproof cell 31. Then, a shielding hatch 32 is provided on the opening of the disassembled product carrying stand 28 into the dustproof cell 31 so as to shield the furnace chamber from the furnace chamber. Also, on the living body shielding floor opening 1 into which the dismantling device is inserted into the furnace chamber, a green house 3 made of an iron panel structure that covers the living body shielding floor opening 1 is provided.
Further, a shielding hatch 34 is provided at a small opening in the upper part of the furnace chamber in which the center pole 12 is inserted to shield the radiation of the structure in the furnace chamber, dust of the dismantled material, etc. Prevention of diffusion.

Embodiment 2 FIG. 3 is a block diagram of a remote dismantling apparatus according to a second embodiment of the present invention. The difference between the present invention and the first embodiment is that a plurality of dismantling devices according to the first embodiment are provided. The configuration shown in FIG. 3 is such that two center balls 1 are provided near the center of the pressure vessel 6 from the small opening of the biological shielding floor opening 1 in the upper part of the furnace chamber in the green house 33.
2 and 12 are provided, and two dismantling devices according to the first embodiment, each provided with a cutting movement device 14 and a gripping movement device 15, are provided. In this way, by employing a structure in which a plurality of moving devices for cutting 14 and a plurality of moving devices for gripping 15 are provided, cutting and dismantling and holding and transporting of dismantled materials can be performed in parallel by a plurality of devices, and the efficiency of dismantling work is improved. Can be achieved.

[0016]

As described above, the present invention provides a cutting mechanism comprising a cutting support arm, a cutting torch for cutting and dismantling a reactor structure connected to the cutting support arm, and the cutting mechanism. A cutting moving device including a cutting device driving unit for positioning a support arm at an arbitrary position, a holding support arm, and a cutting disassembly of the nuclear reactor connected to the holding support arm and cut by the cutting torch; A center pole that is inserted and installed into the furnace chamber from the biological shielding floor opening through a gripping mechanism unit that supports an object and a gripping moving device that includes a gripping device driving unit that positions the gripping support arm at an arbitrary position. The remote dismantling device, which is mounted on the outside and controlled by a remote control device provided outside the furnace chamber, allows the dismantling device to be taken in and out from a small opening, thereby expanding the range of contamination outside the furnace chamber. It can be without. Also,
Since the support arm is short and easy to handle, the disassembly and the disassembly of the disassembly can be performed in parallel and without restriction on the work position or the like, so that the disassembly operation can be performed efficiently and in a short time.

A remote dismantling device is constructed by inserting and installing a plurality of center poles provided with a cutting moving device and a gripping moving device into the furnace chamber.
The dismantling work man-hour can be further reduced, and the dismantling work cost can be reduced.

[0018] Further, a transfer basket for storing the cut dismantled goods conveyed by the gripping moving device, a crane for taking out the cut dismantled goods stored in the transfer basket out of the furnace chamber, and conveying the cut dismantled goods, By providing a dust-proof cell that covers the transfer path, it is possible to prevent radioactive contamination of the surroundings due to the disassembly during transfer. Further, by providing a shielding hatch for shielding the radiation of the core structure at the living body shielding opening and the opening of the transfer basket to the outside of the furnace chamber, and by providing a green house outside the furnace chamber covering the living body shielding opening, the diffusion of contamination can be prevented. It can be carried out. The maintenance and inspection of the remote dismantling device can be easily performed by moving the moving device for cutting and the moving device for gripping into the green house and covering the opening with the above-mentioned shielding hatch, and reducing the exposure of the worker. It can be performed safely in a reduced environment.

Further, after the reactor internal structure such as the pressure vessel is dismantled by the remote dismantling apparatus for a nuclear reactor according to the present invention, the activated biological shield around the reactor and the support structure are newly dismantled. Even when a remote dismantling device is required,
The disassembling apparatus according to the present invention can be configured to deal with the work situation, for example, by exchanging the cutting mechanism and the gripping mechanism of the cutting moving apparatus and the gripping moving apparatus, so that the apparatus can be shared. There is an advantage that you can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a remote dismantling apparatus installed in a furnace chamber according to a first embodiment of the present invention.

FIGS. 2A and 2B are detailed views of a remote dismantling device mounted on a center pole, wherein FIG. 2A is a perspective view and FIG.

FIG. 3 is a configuration diagram of a remote dismantling device installed in a furnace chamber according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional reactor dismantling apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Living body shielding floor opening part 12 Center pole 14 Cutting moving device 15 Grasping moving device 17 Cutting support arm 18 Cutting mechanism unit 19 Telescopic support 20 Cutting device drive unit 22 Holding support arm 23 Gripping mechanism unit 24 Telescopic support structure 25 Gripping device drive unit 26 Remote control device 27 Local dust collection device 29 Transport basket 31 Dustproof cell 32 Shielding hatch 33 Green house 34 Shielding hatch

Claims (6)

[Claims] 1. A cutting moving device and a gripping moving device of a dismantling device inserted into a furnace chamber from an opening of a living body shielding floor on a nuclear reactor by remote control from outside the furnace chamber, and the cutting moving device is provided. In a remote dismantling apparatus for a nuclear reactor in which a reactor internal structure such as a nuclear reactor is cut and dismantled by a cutting torch and the dismantled article is conveyed to a predetermined position by the holding moving device, the cutting moving device is One end is connected to the peripheral surface of a center pole inserted and installed into the furnace chamber from the shield floor opening, and one end is connected to the cutting support arm that extends and contracts in the length direction, and is rotatably connected to the other end of the cutting support arm. The cutting torch, a cutting mechanism for supporting and rotating the cutting torch in an arbitrary posture, and a cutting device driving unit for vertically moving and turning the cutting support arm to position it at an arbitrary position in the furnace chamber. And gripping transfer A gripping support arm extending and contracting in the longitudinal direction, one end of which is connected to the peripheral surface of the center pole at an interval from the cutting support arm, and rotatably mounted on the other end of the gripping support arm; A holding portion for holding the disassembled material cut and cut by the cutting torch and supporting and rotating the holding portion in an arbitrary posture,
A remote control device for a nuclear reactor, comprising: a gripping device drive unit that moves the gripping support arm up and down and pivots up and down to position it at an arbitrary position in the furnace chamber. 2. The remote dismantling apparatus for a nuclear reactor according to claim 1, wherein a plurality of center poles provided with a cutting moving device and a gripping moving device are inserted and installed in the furnace chamber. A remote dismantling device for a nuclear reactor. 3. The remote dismantling device for a nuclear reactor according to claim 1, wherein the disassembled material stored in the transport basket stores the dismantled material transported by the gripping moving device. A remote crane dismantling device for a nuclear reactor, comprising: a transfer crane for taking out and transporting the same outside the furnace chamber; and a dust-proof cell that covers a transfer path for dismantled materials by the transfer crane. 4. A remote dismantling apparatus for a nuclear reactor according to any one of claims 1 to 3, wherein a shielding hatch is provided at an opening of the living body shielding floor and an opening of the transfer basket outside the furnace chamber. Characteristic remote dismantling equipment for nuclear reactors. 5. The remote dismantling apparatus for a nuclear reactor according to claim 1, wherein a greenhouse is provided outside the furnace chamber covering the living body shielding opening. . 6. A remote dismantling apparatus for a nuclear reactor according to claim 1, wherein a local dust collection device is provided in the furnace chamber.