JPH11352293A - Reactor structure automatic dismantling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost necessary for water processing by suppressing the diffusion of secondary products in dismantling of reactor structure formed almost cylindrically. SOLUTION: This automatic dismantling apparatus is constituted by providing an underwater cutting device 3, placed at the lower end of a telescopic manipulator 2 arranged nearly vertically at the upper part of a reactor vessel 1 and a secondary product recovering mechanism 4 arranged on the outside surface of the reactor vessel 1 facing the underwater cutting device 3. To a plasma cutting torch 5, a secondary product diffusion prevention box 8 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic dismantling apparatus for a reactor structure used when dismantling a reactor vessel of a nuclear power plant.

[0002]

2. Description of the Related Art Since a reactor vessel of a nuclear power plant is made of low-alloy carbon steel or the like, when disassembling the reactor vessel, for example, plasma arc cutting is used.
Further, when dismantling the reactor vessel, it is necessary to shield radiation emitted from a clad or the like attached to the reactor vessel, and thus the dismantling operation is performed with the entire vessel submerged in water.

[0003]

However, when a reactor structure such as a reactor vessel is plasma-cut in water,
Since secondary products such as dross generated at the time of cutting are diffused into water, there is a problem that enormous cost is required for water treatment when draining water containing secondary products.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and suppresses the diffusion of secondary products at the time of dismantling a substantially cylindrical reactor structure to reduce the cost required for water treatment. It is an object of the present invention to provide an automatic dismantling apparatus for a nuclear reactor structure that can be used.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a telescopic manipulator disposed substantially vertically above a reactor structure formed in a substantially cylindrical shape, An underwater cutting device attached to a lower end of the manipulator; and a secondary product recovery mechanism disposed on an outer surface side of the reactor structure so as to face the underwater cutting device. A cutting torch for cutting underwater the reactor structure from the inner side, a gap adjusting mechanism for adjusting a gap from the tip of the cutting torch to the reactor structure, and the cutting torch via the gap adjusting mechanism. A cutting torch transfer mechanism for transferring oil in the circumferential direction of the nuclear reactor structure, a secondary product diffusion preventing box attached to the cutting torch, and a secondary product diffusion preventing box. Characterized by comprising a suction hose for sucking recovering secondary products in the scan.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an automatic dismantling apparatus for a reactor structure according to an embodiment of the present invention includes a telescopic manipulator 2 disposed substantially vertically above a reactor vessel 1, and a lower end of the manipulator 2. The underwater cutting device 3 is provided, and a secondary product recovery mechanism 4 is disposed on the outer surface side of the reactor vessel 1 so as to face the underwater cutting device 3.

The telescopic manipulator 2 is for guiding the underwater cutting device 3 to a cutting position, and the telescopic manipulator 2 is attached to a polar crane (not shown).

As shown in FIG. 2, the underwater cutting device 3 includes a plasma cutting torch 5 for cutting the reactor vessel 1 from the inner surface underwater, and a sliding drive of the plasma cutting torch 5 in the radial direction of the reactor vessel 1. And a gap adjusting mechanism 6 for adjusting the gap from the tip of the plasma cutting torch 5 to the reactor vessel 1, and the plasma cutting torch 5 is transferred at a constant speed in the circumferential direction of the reactor vessel 1 via the gap adjusting mechanism 6. A cutting torch transfer mechanism 7 and a rail fixing tool 8 for fixing the guide rail 7a of the cutting torch transfer mechanism 7 to the reactor vessel 1. The plasma cutting torch 5 diffuses secondary products. A secondary product diffusion prevention box 9 for preventing the occurrence of the secondary product is attached.

The secondary product diffusion prevention box 9 is open toward the inner surface of the reactor vessel 1, and a brush 10 is attached to an opening edge of the secondary product diffusion prevention box 9. The secondary product diffusion prevention box 9 surrounds the periphery of the plasma cutting torch 5, and the secondary product diffusion prevention box 9 includes a television camera 11 and a lighting device for confirming a cutting position and a cutting state. Is attached. In addition, the secondary product diffusion prevention box 9
Is connected to a suction hose 12, and the water in the secondary product diffusion prevention box 9 sucked by the suction hose 12 is sent to a secondary product recovery device (not shown).

As shown in FIG. 2, the secondary product recovery mechanism 4 includes an annular secondary product recovery box 13 opened toward the outer surface of the reactor vessel 1, and a secondary product recovery box 13. A box attachment 14 is provided for attaching the secondary product 13 to the outer peripheral surface of the reactor vessel 1. An elastic sealing material 15 such as a rubber tube is attached to an opening edge of the secondary product recovery box 13.

The secondary product recovery mechanism 4 is provided with a suction hose 16 for sucking water in the secondary product recovery box 13, and the water sucked by the suction hose 16 is used as a secondary product (not shown). It is sent to the collection device.
Further, the secondary product recovery mechanism 4 includes a plasma cutting torch 5
A heat-resistant plate 17 is provided inside the secondary product recovery box 13 in order to prevent the secondary product recovery box 13 from being cut by the plasma arc from the apparatus.

When the reactor vessel 1 is dismantled using such a reactor structure automatic dismantling apparatus, as shown in FIG. 1, water 19 is contained in a pit 18 in which the reactor vessel 1 is accommodated.
After the reactor vessel 1 is submerged in water, the telescopic manipulator 2 is set above the reactor vessel 1 and the secondary product recovery box 13 is attached to the outer peripheral surface of the reactor vessel 1. Next, the telescopic manipulator 2 is driven to set the underwater cutting device 3 at the cutting position of the reactor vessel 1, and the plasma cutting torch 5
After the gap from the tip of the reactor to the reactor vessel 1 is adjusted by the gap adjusting mechanism 6, the plasma cutting torch 5 is moved at a constant speed in the circumferential direction of the reactor vessel 1 by the torch transfer mechanism 7, and the reactor vessel 1 is subjected to plasma. It is cut by the cutting torch 5.

When the reactor vessel 1 is cut by the plasma cutting torch 5 as described above, secondary products such as dross are generated on the inner surface side and the outer surface side of the reactor vessel 1. Secondary products generated on the inner surface side of the reactor vessel 1 are collected in a secondary product diffusion prevention box 9 attached to the plasma cutting torch 5, and the reactor vessel 1
The secondary products generated on the outer surface side of the
Is collected in the secondary product collection box 13. Then, the suction hose 1 collected in both boxes 9 and 13
Since it is sent to a secondary product recovery device (not shown) by 2, 16, it is possible to prevent secondary products such as dross from diffusing into water. Therefore, in the above-described embodiment, since the secondary products such as dross do not diffuse into water, the cost required for water treatment can be reduced.

In the above-described embodiment, the reactor vessel is exemplified as the reactor structure that is cut off in water. However, the above-described embodiment can be applied to, for example, dismantling a pressure vessel of a steam generator. . Further, in the above-described embodiment, a plasma cutting torch is used as a cutting torch for cutting underwater a reactor structure such as a reactor vessel from the inner surface side.
For example, a laser cutting torch for laser cutting a reactor structure may be provided.

[0015]

As described above, according to the present invention,
It is possible to provide an automatic nuclear reactor structure dismantling apparatus capable of suppressing the diffusion of secondary products when dismantling a substantially cylindrical reactor structure and reducing the cost required for water treatment.

[Brief description of the drawings]

FIG. 1 is a schematic view of an automatic reactor dismantling device according to an embodiment of the present invention.

FIG. 2 is a detailed view of the device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nuclear reactor 2 Telescopic manipulator 3 Underwater cutting device 4 Secondary product recovery mechanism 5 Plasma cutting torch 6 Gap adjusting mechanism 7 Cutting torch transfer mechanism 8 Rail fixture 10 Secondary product diffusion prevention box 12 Suction hose 13 Secondary Product recovery box 14 Box fixture 16 Suction hose 17 Heat-resistant plate

Claims (1)

[Claims] 1. A telescopic manipulator disposed substantially vertically above a substantially cylindrical reactor structure, a submerged cutting device attached to a lower end of the manipulator, and a submerged cutting device. And a secondary product recovery mechanism disposed on the outer surface side of the reactor structure. The underwater cutting device cuts the reactor structure underwater from the inner surface side, and the cutting torch. A gap adjusting mechanism for adjusting a gap from the tip of the torch to the reactor structure, a cutting torch transfer mechanism for transferring the cutting torch in a circumferential direction of the reactor structure via the gap adjusting mechanism, and the cutting It is characterized by comprising a secondary product diffusion prevention box attached to a torch, and a suction hose for suctioning and collecting the secondary product in the secondary product diffusion prevention box. Reactor structure automated disassembling apparatus to.