JPH0334837B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a construction method and apparatus for dismantling a concrete heat shielding wall of a nuclear reactor.

(Problem) When dismantling a concrete heat shield wall contaminated by radioactivity, such as when dismantling a nuclear reactor, it is necessary to remove it while completely protecting human bodies and the atmosphere from radioactivity contamination.

That is, the concrete heat shield wall must be accurately cut, the cut block must be mechanically gripped, and the cut block must be safely transported.

(Object and outline of the invention) The present invention has been devised in view of the above points, and
The object of the present invention is to provide a demolition method and device for mechanically cutting, grasping, and transporting the concrete heat shielding wall of a nuclear reactor with high efficiency and high precision.

In the nuclear reactor dismantling method of the present invention, the upper part of the reactor is divided into an enclosure, and the main shaft installed in the enclosure is traversed, raised and lowered, and rotated, and the cutting device itself is moved. After positioning and cutting a predetermined furnace wall, the cut block is gripped by a gripper that moves using the main shaft as a guide, sealed in a carry-in/out lock device, and carried out to the outside of the enclosure. This method is characterized in that the slag that falls to the bottom of the reactor and accumulates during cutting is also collected by a bucket device, and by this method, the concrete heat shielding wall of the reactor is mechanically cut to a predetermined size by remote control. It is a demolition method that ensures human safety and prevents air pollution because it can be cut into thick blocks, and it can also be grasped and carried out mechanically in a completely sealed state.

Another object of the present invention is to provide a suitable demolition device for use in carrying out the above demolition method.

The nuclear reactor disassembly apparatus of the present invention includes an enclosure provided in the upper part of the reactor, a main shaft suspended in the reactor via a gantry and a lifting device provided on the upper side of the enclosure, and A cutting device is installed at the lower end, and a gripping device is installed on the main shaft that rotates by taking a reaction force and moves up and down as a guide.A loading/unloading lock device is installed in the enclosure, and a slag is installed at the bottom of the furnace. Since it is characterized by the provision of a recovery device, it is possible to mechanically and efficiently cut the concrete heat shielding wall of a nuclear reactor, and to safely grasp and transport it.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The nuclear reactor dismantling method and its apparatus according to the present invention will be specifically explained below with reference to the drawings.

(Example) FIG. 1 is a partially cutaway perspective view illustrating a nuclear reactor dismantling device.

The nuclear reactor dismantling apparatus of the present invention erects an enclosure 10 on top of the nuclear reactor 1 as a radiation shielding building.

A gantry 20 and a lifting device 30 are provided on the upper side 11 of this enclosure 10, and a main shaft 40 is suspended within the reactor 1 via these.

The gantry 20, the lifting device 30, and the main shaft 40 are supporting and driving parts of the cutting device.The gantry 20 is a U-shaped iron frame material, and the upper part has a structure in which the lifting device 30 can be moved. 40 are arranged. Moreover, the diffusion shielding gate 21 provided on the lower surface ensures the airtight function of the enclosure 10 and prevents the diffusion of radioactivity.

The elevating device 30 has a structure in which a main shaft 40 is suspended above the gantry 20, and is caused to move horizontally, raise and lower, and rotate via a hydraulic motor.
Therefore, the cutting device 50 provided at the lower end of the main shaft 40 can move the vertical cutting machine 52 and the horizontal cutting machine 53 horizontally, raise and lower, and rotate.

On the other hand, the main shaft 40 is made by joining together hollow members divided into unit lengths, and inside the hollow members, hydraulic pipes, pneumatic pipes, control wires, fuel supply pipes, etc. are arranged to protect from radioactivity. has been done.

Further, by moving the lifting device 30 laterally, its axis can be placed at three reference positions. Usually, a gripping device 60 is provided at the upper part of the main shaft 40, and the cutting block cut by the cutting device 50 is gripped by a gripping arm 61, and a loading/unloading lock device 70 provided in the enclosure 10 is used to grip the cutting block cut by the cutting device 50.
It is intended to be transported up to For this reason, the gripping device 60
can be moved vertically by a winch 62 using the main shaft 40 as a guide, and the main shaft 40 can be moved by a swing motor 63.
It has a structure that allows it to rotate by taking a reaction force. A slag recovery device 90 is arranged at the bottom of the furnace, and the slag that falls during cutting by the cutting device 50 is recovered by a bucket device 91 and carried out.

FIG. 2 is a partially omitted front view for explaining the elevating device 30 in more detail.

This elevating device 30 has a swivel base 32 installed on a trolley 31 placed on the frame of the gantry 20, and the main shaft 40 is passed through the swivel base 32 and its upper end is fitted. 33, the main shaft 40 also moves laterally. Further, an arbitrary number of lifting cylinders 37 are arranged around the main shaft 40.
37..., and by alternately repeating fixing and opening of the lock 34 and the lower lock 35, and performing rearrangement operations for raising and lowering within the stroke of the cylinder, the main shaft 40 can be raised and lowered by the required amount. still,
When the turning motor 36 is driven to turn the turning table 32, the main shaft 40 turns via the upper and lower locks 34 and 35.

Furthermore, a protection circuit is provided separately from the hydraulic circuit for the lifting cylinders 37, 37, .

Incidentally, the diffusion shielding gate 21 is slid and sealed by the gate cylinder 22 in synchronization with the movement of the main shaft 40, and the radiation shielding function of the enclosure 10 is maintained.

3 and 4 are a schematic front view and a schematic side view showing a nuclear reactor disassembly apparatus according to the present invention.

That is, an enclosure 10 of a size corresponding to the reactor diameter of the nuclear reactor is built, and a main shaft 40 of a length corresponding to the activation site is suspended. Further, if necessary, the enclosure 10 can be constructed in a double structure, and the so-called dismantling device can be in a double lock state.

FIG. 5 is a view taken along the line AA in FIG. 3, and is a plan view showing the elevating device 30 in a traversing state.

FIG. 6 is a view taken along the line B-B in FIG. 3, showing the winches 62, 62 for raising and lowering the gripping device 60 and the winch 92 for driving the bucket device 91 of the slag recovery device 90 arranged at their respective fixed positions. This shows that.

FIG. 7 is a view taken along the line C-C in FIG. 3, showing a state in which the cutting block is gripped by the gripping device 60, dropped into the storage container 71 of the loading/unloading lock device 70, and sealed. be.

FIG. 8 is a view taken along the line D--D in FIG. 3, and shows the planar arrangement of the longitudinal cutter 5 and the transverse cutter 53 of the cutting device 50. FIG. The vertical cutting machine 52 and the horizontal cutting machine 53 are provided with a phase shift in the vertical direction to prevent damage caused by flame from the other. Furthermore, in order to prevent the main shaft 40 from swinging, an outrigger 80 provided at the top of the cutting device 50 is extended.

FIG. 9 is a plan view showing the slag recovery device 90 in which the furnace bottom is arranged as viewed from the line E--E in FIG. 3. The molten slag that has fallen onto the rotary table of the slag recovery device 90 is collected in one place and transported to the outside by a bucket device 91.

FIG. 10 is an explanatory schematic diagram of supplying fuel for burning a burning bar to the cutting device 50.

The cutting device 50 includes a vertical cutting machine 52 and a horizontal cutting machine 53.
are provided, each of which holds a burning bar supplied by an automatic supply device by an arm,
This burning bar is burned to cut the concrete heat shield wall vertically and horizontally.

Therefore, each cutting machine 52, 53 has a compressed air source A.
Compressed air is supplied from a power supply B, a constant voltage is supplied from a power supply B, oxygen is supplied from an oxygen storage C, and propane gas is supplied from a propane gas storage D via a fuel supply pipe F.

This fuel supply pipe f is connected to the elevator 3 as described above.
The cutting device 50 is connected to a required piping portion by passing through the hollow of the main shaft 40 protruding from the head of the main shaft 40.

The procedure for cutting a reactor wall using the nuclear reactor dismantling apparatus of the present invention having the above-described configuration will be explained based on the flowchart of FIG. 11.

First, the operation of the support drive of the cutting device is started by the central operator's cab. That is, the current position of the cutting device is read and the cutting block is designated based on the pre-analyzed cutting order (cutting row number order and cutting ring number order). Then, select the cutting block to make the main shaft traverse, raise and lower, and rotate.

First, when cutting the first block, the burning bar stocker carried in through the loading/unloading lock device is gripped by the arm of the gripping device and placed in the cutting device of the cutting device.

Next, the outrigger of the main shaft is opened and the main shaft is raised and lowered based on the movement of the cutting row number. With the cutting device disposed at a predetermined height, the main shaft is rotated until it reaches the cutting block, and the outriggers provided on the main shaft are extended and brought into contact with the cavity.

In this state, the burning bar of the cross-cutting machine is ignited to horizontally drill holes. Then, a so-called back hole is made using a vertical cutting machine.

On the other hand, when cutting by moving the cutting ring No., open the outrigger of the main shaft,
The outrigger of the main shaft is extended while the main shaft is rotated and the cutting device is placed in a predetermined position. Then, a horizontal cutting machine is used to make vertical holes and cut the furnace wall.

Then, when a predetermined amount of cutting blocks have been cut, the gripper descends via the main shaft, grips the cutting blocks, and ascends. At this time, a storage container is placed in an open state in front of the loading/unloading lock device, and the cutting block is placed into this storage container. The gripping machine then moves to its normal position. When a predetermined amount of cutting blocks are loaded into the storage container through this process, the storage container is returned to the loading/unloading lock device via the transfer device, sealed, and transported outside the enclosure.

When a certain amount of the furnace wall is cut through the above cutting procedure, slag falls and accumulates at the bottom of the furnace.
This slag is collected by a slag collection device and transported to the outside of the enclosure in the same manner as the cutting block is transported.

Although the above cutting procedure has been described as a two-system cutting operation involving movement of the cutting row No. and movement of the cutting ring No., the present invention does not exclude one system of single cutting operation.

(Effects of the Invention) As described above, the nuclear reactor dismantling method and device of the present invention partition the upper part of the reactor into an enclosure, and allow the main shaft installed upright within the enclosure to move, move up and down, and rotate. The furnace wall is cut by the movement of the cutting device itself, and the cut blocks are gripped by a gripping device that moves using the main shaft as a guide, and carried out to the outside of the enclosure via a loading/unloading lock device. The slag that has fallen and accumulated in the reactor is collected by a bucket device and discharged to the outside.Moreover, this device is equipped with an enclosure at the top of the reactor, and a gantry and lifting device installed on the top of the enclosure. A main shaft is suspended in the furnace through the main shaft, and a cutting device is provided at the lower end of the main shaft, and a gripping device is provided on the main shaft that rotates by taking a reaction force and moves up and down as a guide. The furnace is equipped with a loading/unloading lock device, and the bottom of the furnace is equipped with a slag recovery device.
It is now possible to automatically and mechanically cut and transport the reactor wall of a nuclear reactor contaminated with radioactivity efficiently, and since the cutting block is transported completely sealed, there is no contamination to the outside world such as human bodies or the atmosphere. This is an extremely appropriate nuclear reactor dismantling method and equipment, as none of them were destroyed.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view illustrating the nuclear reactor dismantling method and its equipment according to the present invention, Fig. 2 is a partially omitted front view illustrating the lifting device, and Fig. 3 is the reactor dismantling method. 4 is a schematic side view of the reactor disassembly equipment, FIG. 5 is a view taken along line A-A in FIG. 3, and FIG. 6 is a view taken along line B-- in FIG. 3.
7 is a view taken along the line C-C in FIG. 3, FIG. 8 is a view taken along the line D-D in FIG. 3, and FIG. 9 is a view taken along the line E in FIG. 3. -E line arrow view,
FIG. 10 is an explanatory schematic diagram of supplying fuel to the cutting device, and FIG. 11 is a flowchart diagram illustrating the cutting procedure by the demolition method of the present invention. 1... Nuclear reactor, 10... Enclosure, 20
... Gantry, 30 ... Lifting device, 40 ... Main shaft, 50 ... Cutting device, 52 ... Vertical cutting machine, 53 ... Horizontal cutting machine, 60 ... Gripping device, 7
0... Loading/unloading lock device, 80... Outrigger, 90... Slag collection device.

Claims (1)

[Scope of Claims] 1. The upper part of the reactor is divided by an enclosure, and the position of the reactor is set by traversing, raising and lowering, and turning the main shaft installed upright within the enclosure, and by moving the cutting device itself. The wall is cut into blocks, and the cut blocks are gripped by a gripping device that moves using the main shaft as a guide, and are carried out to the outside of the enclosure via a carry-in/out lock device, and when the cut blocks are cut, they are transported to the bottom of the furnace. The slag that has fallen and accumulated on the rotary table of the slag recovery device placed at the bottom of the furnace is collected by a bucket device, sealed in a storage container in a loading/unloading lock device, and discharged to the outside of the enclosure. Characteristic nuclear reactor dismantling method. 2. The nuclear reactor dismantling method according to claim 1, wherein the cutting burning bar used in the cutting device is automatically supplied from a stock box. 3. The method for dismantling a nuclear reactor according to claim 1, wherein the cutting block is sealed in a storage container within a carry-in/out lock device provided in the enclosure and carried out to the outside of the enclosure. 4. An enclosure is provided in the upper part of the reactor, a main shaft is suspended in the reactor via a gantry and a lifting device provided on the upper side of the enclosure, a cutting device is provided at the lower end of the main shaft, and a cutting device is provided at the lower end of the main shaft. A gripping device is provided on the shaft to rotate by applying a reaction force and move up and down as a guide, and a loading/unloading lock device is provided in the enclosure,
A nuclear reactor dismantling device characterized by a slag recovery device installed at the bottom of the reactor. 5. The nuclear reactor disassembly apparatus according to claim 4, wherein the elevating device is provided with a locking device for preventing the main shaft from falling. 6. The nuclear reactor dismantling apparatus according to claim 4, wherein the main shaft is moved laterally, raised and lowered, and rotated by a lifting device. 7. The nuclear reactor according to claim 4 or 6, wherein a hydraulic pneumatic pipe, a control wire, a power line, a fuel supply pipe, and a communication wire are arranged in the hollow of the main shaft. demolition equipment. 8. The nuclear reactor dismantling device according to claim 4, wherein the cutting device is provided with an outrigger to prevent vibration of the main shaft. 9. The nuclear reactor dismantling device according to claim 4, wherein the cutting device includes a vertical and horizontal cutting machine attached to a movable box.