JPH0827392B2 - Reactor dismantling method and dismantling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor dismantling method for cutting and dismantling a biological shield wall of a nuclear reactor and carrying the dismantled material out of the reactor, and a dismantling apparatus used for the dismantling.

[0002]

2. Description of the Related Art When a boiling water reactor (BWR) among light water reactor type reactors is dismantled for reasons such as decommissioning, etc.
As shown in FIG. 8 and FIG. 19, the cutting and dismantling device 32 is lowered from above into the living body shielding wall 33 by an overhead crane 31 on the work floor 30, or a scaffold 34 fixed in the living body shielding wall 33 is assembled to this. By operating the dismantling device 32 mounted, the waste 35 finely cut and dismantled by the cutting dismantling device 32 is operated by the overhead crane 31 on the work floor 3
It was carried to 0.

[0003]

However, in the above-mentioned nuclear reactor dismantling method, it is inefficient to move and handle the cutting and dismantling device, and it is also inefficient to recover the waste that has been dismantled. There was a drawback that said it would cost.

The present invention has been made in view of the above problems, and aims to streamline the operation of carrying out dismantled in-furnace waste,
An object of the present invention is to provide a reactor dismantling method and a dismantling device that shorten the construction period and save labor.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention to solve the above problems and achieve the above objects is to extend inside a living body shield wall of a nuclear reactor from a lower portion of the living body shield wall to an upper working floor. At least one or more elevator lifts and at least one of which is provided rotatably in the circumferential direction around a cutting mast that is erected around the elevator lifts and has a shape that follows the shape of the inner wall surface of the biological shielding wall. A scaffold for cutting, a drilling device and a collection device that are movably mounted on the scaffold for cutting, a truck that automatically travels on a rail laid on the inner periphery of the scaffold for cutting, and the truck. A dismantling device including a transfer device interposed between the elevator lifts is formed, a drilling device is attached to the cutting scaffold, and the living scaffold wall surface is rotated by rotating the cutting scaffold and moving the drilling device. Vertical and horizontal Insert a cutting line, then perform rear surface drilling with a drilling device to cut out a cutting piece from the biological shielding wall, collect the cutting piece with the collecting device, transfer it to the dolly, and transfer the dolly from the dolly via a conveying device. It consists in carrying out the cut pieces to the work floor by the elevator lift and repeating the cutting and carrying-out work to dismantle the nuclear reactor.

Further, as a dismantling device, an elevator lift extending from a lower part in a biological shield wall in a nuclear reactor to an upper working floor, and a cutting mast standing around the elevator lift are centered around the elevator mast. At least one scaffold for cutting, which is rotatably provided in a predetermined direction and has a shape along the inner wall surface of the biological shielding wall, and a drilling device and a collecting device movably mounted on the scaffold for cutting. And a trolley that automatically travels on a rail laid on the inner periphery of the scaffolding for cutting under the cutting scaffold, and a transfer device interposed between the trolley and the elevator lift.

[0007]

According to the nuclear reactor disassembling method of the present invention, the cutting scaffold can be appropriately rotated by a remote operation around the cutting mast to move the cutting portion of the drilling device. The cutting lines can be provided at appropriate intervals in the vertical and horizontal directions on the biological shielding wall. Then, the cut piece can be cut off from the living body shielding wall by edging, and the cut piece can be automatically carried out from the inside of the living body shielding wall to the working room by a recovery device, a truck, an elevator lift, or the like.

Further, according to the dismantling apparatus of the present invention, since the cutting scaffold is rotatable in the circumferential direction of the cutting mast, the drilling device can be quickly moved to the next cutting position, This makes it easier to move the cutting point. Then, the cut pieces can be automatically carried out from the recovery device through the trolley by the transport device and the elevator lift, and the cutting and dismantling work of the biological shielding wall can be automated.

[0009]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an outline of an apparatus for carrying out dismantled material in a nuclear reactor according to the present invention. In the figure, reference numeral 1 is a biological shielding wall, 2 is a reactor dismantling device, 3 is an elevator lift, 4a
Is a cutting mast, 4b is a scaffold for cutting, 5 is a boring device, 6 is a collecting device, and 7 is a truck.

A reactor dismantling apparatus 2 according to the present invention includes an elevator lift 3 extending from a lower part of a living body shield wall 1 to an upper working floor, and a cutting mast 4a so as to be rotatable around the cutting mast 4a. A cutting scaffold 4b provided and shaped according to the shape of the inner wall surface 1a of the biological shielding wall 1, and a drilling device 5 movably mounted on the cutting scaffold 4b.
Similarly, the recovery device 6 and the truck 7 that automatically travels on the rail laid on the inner peripheral side of the cutting scaffold 4b at the bottom thereof.
It consists of and.

Further, details of each component of the reactor dismantling apparatus 2 will be described. The elevator lift 3 is shown in FIG.
As shown in FIG. 5, a rectangular cutting mast 4a is assembled, and an elevator 3b is provided therein, and a roller conveyor 18 is provided below the elevator 3b.
A transporting device 3c having a plurality of rollers, and a transporting device 3 having a plurality of roller conveyors 18 above the elevator 3b.
d are provided respectively.

The transfer device 3c transfers the cutting pieces 8 carried by the truck 7 by the roller conveyor 18 and carries them into the elevator 3b. Further, the transfer device 3d transfers the cutting pieces 8 lifted by the elevator 3b to the container 10 in the working chamber 9. Since the inside of the work chamber 9 has a low level of radioactivity, the worker can work for a relatively long time.

As shown in FIGS. 1 to 4, the cutting scaffold 4b has a circular shape with a steel frame 4c having a shape substantially parallel to the inner wall surface 1a of the biological shield wall 1 of the nuclear reactor via rolling elements. Assembled on the rail 14 laid on the cutting mast 4a, and at least one of them is provided around the cutting mast 4a.
Provide in pairs.

The two pairs of steel frame 4c are
The cutting mast 4a is supported by supporting rings 11 and 12 provided at the central portion and the lower portion of the cutting mast 4a and is rotatable in the circumferential direction. Teeth are engraved on the peripheral surfaces of the support rings 11 and 12, and the steel frame 4 is meshed with the teeth.
When the rotation gear (not shown) of c is rotated by the motor 13, the steel frame 4c of the cutting scaffold 4 rotates around the cutting mast 4a on the rails 14, respectively.

Next, the boring device 5 will be described. As shown in FIGS. 2 and 7 to 8, the drilling device 5 is mounted on a guide rail of the steel frame 4c, and a moving device 5a that is movable along the guide rail by driving a motor. And a cylinder device 5b that can be expanded and contracted from the moving device 5a toward the inner surface 1a of the biological shielding wall.
And a cutting blade 5c rotatably supported by the tip rod of the cylinder device 5b.

The cutting work position of the blade 5c is variable by the expansion and contraction of the cylinder device 5b, and the blade 5c also rotates when the cylinder device 5b is rotated around the support shaft with respect to the moving device 5a. It is possible to perform cutting work in horizontal and vertical directions or in an inclined state.

Further, a core bit 15 for vertical hole cutting as shown in FIG. 8 is also mounted on the tip of the cylinder device 5b. This is the blade 5c,
After cutting the biological shield wall 1 in the horizontal direction and in the horizontal direction to a predetermined size, a large number of holes are continuously drilled in the vertical direction by the core bit 15 to cut the cut piece 8 from the biological shield wall 1. .

Next, as shown in FIGS. 9 to 12, the recovery device 6 includes the H-shaped guide rail 1 of the steel frame 4c.
From the recovery unit moving device 6a mounted between Nos. 6 and 16 and driven by a motor or the like to move along the guide rail 16, and the recovery unit 17 mounted on the recovery unit moving device 6a. Composed.

The recovery unit 17 includes a living body shielding wall 1
Of the more curved upper cutting piece 8 (see FIG. 11) and a collecting unit 17b (FIG. 12) for collecting the cutting piece 8 from the central portion of the biological shielding wall 1 to the lower portion. See) and.

The cut pieces 8 cut and collected from the biological shielding wall 1 by the collecting unit 17 are shown in FIGS.
As shown in FIG. 5, the steel frame 4c is carried to the lower part by the recovery unit 17, and is once placed on the basket 20a placed on the lower basket 20 on the roller conveyor 18.

Then, as shown in FIG. 16, when the truck 7 that automatically orbits on the rail 19 laid in a circular shape inside the cutting scaffold 4b is fed, the roller conveyor 18 rotates and the lower basket 20. By lowering, the upper part of the roller conveyor 18 is projected from the hole of the lower basket 20, the bottom surface of the basket 20a and the roller conveyor 18 contact each other, and the basket 20a is transferred onto the truck 7 together with the cutting piece 8. It

In the truck 7 also, the roller conveyor 1
When the cutting piece 8 is accommodated in the receiving basket 21 by 8, the receiving basket 21 is lifted up and the contact between the roller conveyor 18 and the basket 20a is cut off. In this way, the cutting piece 8 is placed on the dolly 7, and then it moves on the rail 19 and, as shown in FIGS.
It is remotely operated so as to reach the end of the transfer device 3c.

The cutting pieces 8 carried by the truck 7 are transferred to the carrying device 3c and carried to the container 10 in the working chamber 9 via the elevator lift 3. The drilling device 5, the recovery device 6, the elevator lift 3, and the transfer devices 3c and 3d are also the work chamber 9
It is operated by remote control from.

In order to use the reactor dismantling apparatus 2 thus formed, first, the cutting mast 4 is placed in the biological shield wall 1.
a and the elevator 3b are assembled and the elevator lift 3
And the rails 14 and 19 are laid. Then, after the transfer devices 3c and 3d and the truck 7 are installed, the drilling device 5 and the recovery device 6 are set on the steel frame 4c.

Next, the drilling device 5 is moved to the cutting position by remote control, and the blade 5c is rotated to cut the biological shield wall 1 in the vertical and horizontal directions. In this cutting operation, first, in order to perform the cutting operation in the direction perpendicular to the inner surface 1a of the biological shielding wall 1, the blade 5c is rotated while moving the boring device 5 of the scaffold 4b for cutting along the guide rails. Cut at a depth (for example, about 10 cm). Then, the cutting work in the vertical direction is performed a plurality of times by gradually increasing the cutting depth, until the cutting depth becomes about 40 cm.

When the vertical cutting work is completed, the cylinder device 5b of the drilling device 5 of each steel frame 4c is rotated about 90 ° about its axis to bring the blade 5c into the horizontal plane and tilt it. Then, while rotating the blade 5c, each steel frame 4c is rotated about the cutting mast 4a. As a result, a single horizontal cutting line (depth of about 10 cm) is formed on the inner surface 1a of the biological shielding wall. Then, the cutting depth is further increased, and the above horizontal cutting work is performed a plurality of times until the cutting depth reaches about 40 cm.

In this way, the entire inner surface 1a of the living body shield wall is cut at a cutting depth of about 40 cm in the horizontal and vertical directions to form cutting lines in a grid pattern. It should be noted that the cutting work in the horizontal direction and the vertical direction described above may be carried out first depending on the work setup.

Next, the cut pieces 8 at the stage of being cut into a lattice shape
The core bit 15 is attached to the hole drilling device 5 in order to cut it off from the biological shielding wall 1. Then, as shown in FIG. 8, the biological shielding wall 1 is cut by cutting a continuous piece of the core bit 15 to cut a cut piece 8 from the biological shielding wall 1. And
The cut pieces 8 are collected by the collecting device 6. The cutting piece 8 is about 1.5 m in length and width and about 40 cm in thickness.
Is. As described above, the recovery unit 17a shown in FIG. 11 is used above the living body shielding wall 1, and the recovery unit 17b shown in FIG. 12 is used at other locations to recover the cut pieces 8.

Then, the cut pieces 8 recovered by the recovery device 6
Is transferred to the truck 7 (see FIGS. 16 to 17), and the truck 7 is moved on the rail 19 to reach the end of the transport device 3c (see FIG. 5). And FIG.
As shown in, the cut piece 8 of the dolly 7 is transferred onto the transport device 3c, and is transferred by the roller conveyor 18 to the elevator car 22 of the elevator lift 3.

In this way, the elevator lift 3 moves the cutting pieces 8 into the container 1 in the working chamber 9 above the living body shielding wall 1.
It is to be transferred to 0 through the transfer device 3d. In this way, the cutting, collection, and carrying out of the cut pieces 8 are repeated to dismantle the biological shield wall of the nuclear reactor.

[0031]

As described above, according to the nuclear reactor disassembling method of the present invention, a special dismantling device is formed in the living body shielding wall of the reactor, and the living body shielding wall is repeatedly cut and carried out by remote control. Since the nuclear reactor is dismantled, the dismantling work becomes more efficient and the construction period is shortened. Since the worker does not have to approach the biologically shielded wall contaminated with radioactivity and engage in the dismantling work for a long time, the amount of exposure is reduced and the safety of the dismantling work is enhanced.

The reactor dismantling apparatus of the present invention is provided with an elevator lift and at least one of which is provided rotatably in the circumferential direction around the cutting mast and conforms to the shape of the inner wall surface of the biological shielding wall. Since the scaffold for cutting described above, a drilling device and a collection device that are movably mounted on the scaffold for cutting, a dolly that automatically travels, and a carrier device, a grid-shaped cutting line is formed on the biological shielding wall. In forming, the cutting site can be easily moved by the rotation of the cutting scaffold, and the cutting work becomes efficient. In addition, cutting of the biological shielding wall and removal of cut pieces can be performed by remote control, which enables automation of disassembly work and shortens the construction period.

[Brief description of drawings]

FIG. 1 is a front view showing the outline of a nuclear reactor dismantling apparatus according to the present invention.

FIG. 2 is a perspective view showing an upper portion of a cutting scaffold of a nuclear reactor dismantling apparatus.

FIG. 3 is a partial perspective view showing a structure for rotating one cutting scaffold.

FIG. 4 is a front view of FIG.

FIG. 5 is a schematic explanatory view showing a relationship between an elevator lift, a truck, and a transfer device.

6 is a view taken along the line aa in FIG. 1. FIG.

FIG. 7 is a perspective view showing one drilling device.

FIG. 8 is an explanatory diagram showing a state in which a cut piece is cut out from the biological shielding wall by the core bit.

FIG. 9 is a front view showing a moving device of one recovery unit.

FIG. 10 is a plan view of FIG.

FIG. 11 is a front view of the recovery unit for the upper part of the biological shielding wall among the recovery units.

FIG. 12 is a front view showing a usage state of the recovery unit for a part of the recovery unit other than the upper part of the biological shielding wall.

FIG. 13 is an explanatory diagram showing a state in which a cutting piece is being transferred to a lower part of a cutting scaffold.

FIG. 14 is an explanatory diagram showing a state in which cut pieces are transferred to a roller conveyor.

FIG. 15 is an explanatory diagram showing a manner in which cut pieces are transferred by a roller conveyor.

FIG. 16 is a front view showing a state in which a cut piece is placed on a dolly.

FIG. 17 is an explanatory diagram showing a state in which a cutting piece is transferred from the cutting scaffold to the dolly.

FIG. 18 is an explanatory diagram showing a cutting operation according to a conventional example.

FIG. 19 is also an explanatory view showing how a cutting piece is lifted by an overhead crane according to the conventional example.

[Explanation of symbols]

1 living body shielding wall, 2 reactor dismantling device, 3 elevator lifts, 3c, 3d transfer device, 4a cutting mast, 4
b Cutting scaffold, 5 drilling device, 6 recovery device, 7 truck.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Harenori Yasoshima, 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor, Nagayoshi Yoshihara, 1-1-7, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Hisao Ozaki 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Shigeru Ogi 1-1-7, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. ( 72) Inventor Satoshi Uebayashi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References JP-A-59-27297 (JP, A) JP-A-1-314999 (JP, A) JP 62-49299 (JP, A) JP 2-195300 (JP, A) JP 61-237095 (JP, A) JP 60-7109 (JP, B2)

Claims (2)

[Claims] 1. An elevator lift extending from a lower part of the biological shield wall to an upper working floor in the biological shield wall of a nuclear reactor, and a cutting mast standing upright around the elevator lift. At least 1 rotatably provided in the direction and conforming to the shape of the inner wall surface of the biological shielding wall
The above cutting scaffold, a drilling device and a collection device that are movably mounted on the cutting scaffold, a truck that automatically travels on a rail laid on the inner periphery of the cutting scaffold at the bottom, A dismantling device comprising a trolley and a transfer device interposed between the elevator lifts is formed, and a boring device is attached to the cutting scaffold, and the living scaffold is shielded by rotating the cutting scaffold and moving the boring device. Put a cutting line in the vertical direction and the horizontal direction on the wall surface, then cut back a cut piece from the biological shielding wall by making a back hole with a hole making device, collect the cut piece with the collecting device, and further transfer to the truck. A nuclear reactor disassembling method, characterized in that the cut pieces are carried out from the truck to the work floor by the elevator lift via a conveyor, and the cutting and carrying-out work is repeated to dismantle the reactor. 2. An elevator lift extending from a lower part inside a biological shield wall in a nuclear reactor to an upper working floor, and a cutting mast standing upright around the elevator lift so as to be rotatable in its circumferential direction. At least one scaffold for cutting that is shaped according to the shape of the inner wall surface of the biological shielding wall, a drilling device and a collecting device that are movably mounted on the scaffold for cutting, and the scaffold for cutting. A nuclear reactor disassembling apparatus comprising: a trolley that automatically travels on a rail laid on the inner periphery of the trolley at a lower portion, and a transfer device that is interposed between the trolley and the elevator lift.