KR102566506B1 - Method and apparatus for dismantling reactor vessel - Google Patents

Abstract

The present invention relates to a method for disassembling a reactor vessel, wherein a reactor pool is divided into a high area and a low area, and a first step is to dismantle the superstructure of the reactor vessel by cutting it in the air, moving it to the lower area, and cutting it in water. and a second step of disassembling the lower structure of the reactor vessel by moving it to the lower region, then dividing and cutting, moving the divided and cut intermediate structure of the reactor vessel to the higher region, and then cutting and disassembling the dismantled reactor vessel in water. According to the present invention, it is possible to stably dismantle the reactor vessel while preventing exposure to radiation in a nuclear reactor pool having spatial limitations.

Description

Reactor vessel dismantling method and device {METHOD AND APPARATUS FOR DISMANTLING REACTOR VESSEL}

The present invention relates to a method and apparatus for dismantling a nuclear reactor vessel, and more particularly, to a method and apparatus for dismantling a nuclear reactor vessel capable of stably dismantling a nuclear reactor vessel in a nuclear reactor pool having spatial limitations in dismantling operations.

In general, in a nuclear reactor facility such as a nuclear power plant, abolishment measures are taken when operation is terminated. The abolition measures are carried out in the order of systemic decontamination, safe storage of nuclear fuel, and dismantling and removal.

In the dismantling and demolition, the building is removed after the internal piping and equipment are removed. In dismantling and demolition, it is necessary not to scatter radioactive materials to the outside, and to prevent radiation exposure to workers engaged in dismantling and demolition.

Among the equipment, the removal of the reactor vessel is the most difficult. The process itself is numerous and there is a risk of exposure to radiation, so safety is the most important.

When the space of the reactor pool in which the reactor vessel is arranged is sufficiently wide, various devices necessary for the dismantling work can be comfortably arranged, which is advantageous during the dismantling work.

However, when the space of the reactor pool is not sufficient, for example, the height of the reactor pool is not significantly different from the height of the reactor vessel, it is difficult to dispose the dismantling devices and perform the disassembly process while preventing radiation exposure. In this case, a separate process for disassembling the reactor vessel in a small space while maintaining safety is required.

Japanese patent registration number: JP6788570B2

The present invention has been made to solve the problems in the related art field as described above, and an object of the present invention is a method for dismantling a reactor vessel capable of stably dismantling a reactor vessel in a nuclear reactor pool having spatial limitations in dismantling work. and to provide an apparatus.

The present invention for achieving the above objects relates to a method for disassembling a reactor vessel, wherein a reactor pool is divided into a high area and a low area, the upper structure of the reactor vessel is cut in the air and moved to the lower area. A first step of dismantling by cutting in the middle; a second step of moving the lower structure of the reactor vessel to the lower region and then dividing and cutting it; and a third step of packaging the dismantled reactor vessel.

In addition, in an embodiment of the present invention, the first step may include installing a band saw in the lower region; installing a shielding tent and a blower on top of the reactor vessel in the high region; Installing a circular saw inside the reactor vessel; cutting the upper structure of the reactor vessel with a circular saw; and dismantling the shielding tent and the blower.

In addition, in the embodiment of the present invention, in the step of installing the circular saw inside the reactor vessel, the circular saw is connected to the contact sensor by a link beam, the contact sensor is in contact with the upper part of the reactor vessel, and The cutting position of the upper structure can be specified.

In addition, in the embodiment of the present invention, the first step, after the step of disassembling the shielding tent and the blower, moving the cut upper structure of the reactor vessel to a band saw; Installing a cover in the arrangement space of the reactor vessel; and filling water into the reactor pool.

In addition, in the embodiment of the present invention, the first step, after the step of filling the water, cutting and disassembling the cut upper structure of the reactor vessel with a band saw; dismantling the band saw in the lower region; and draining water from the inside of the nuclear reactor pool.

In addition, in an embodiment of the present invention, the second step may include installing a jig in the low area after the step of draining the water; Disassembling the cover;

cutting the nozzle of the reactor vessel; and lifting the lower structure of the reactor vessel and placing it on the jig.

In addition, in the embodiment of the present invention, the second step may include: installing a cover on the upper part of the placement space of the reactor vessel after the step of lifting the lower structure of the reactor vessel and placing it on the jig; and filling water into the reactor pool.

In addition, in the embodiment of the present invention, the second step, after the step of filling the water, installing a band saw in the high area; Installing a circular saw inside a lower structure of a reactor vessel; and dividing and cutting the lower structure of the reactor vessel with a circular saw.

In addition, in the embodiment of the present invention, the second step may include: moving the divided and cut lower structure of the reactor vessel to a band saw after the step of dividing and cutting the lower structure of the reactor vessel with the circular saw; Cutting and disassembling the lower structure of the reactor vessel, which has been divided and cut with a band saw; Dismantling the band saw and the circular saw; and draining water from the inside of the nuclear reactor pool.

In addition, in the embodiment of the present invention, in the second step, when the lower structure of the reactor vessel is cut and dismantled, the lower head among the lower structures of the reactor vessel may be cut and dismantled with a circular saw.

The present invention also relates to a device for disassembling a nuclear reactor vessel, wherein the device for disassembling a nuclear reactor vessel includes a circular saw, wherein the circular saw includes: a first frame on which an expansion unit is disposed; a cutting unit including a saw motor disposed on the first frame, a circular blade connected to a rotary shaft of the saw motor, and a unit frame connected to the extension unit and supporting the circular blade; a second frame connected to the first frame through a rotating unit; and a fixing unit disposed on the second frame and fixing the second frame to the inside of the reactor vessel.

In addition, in an embodiment of the present invention, the circular saw may include a link beam connected to an upper portion of the first frame; and a contact sensor disposed on the link beam, wherein the contact sensor is in contact with the upper part of the reactor vessel and can designate a cutting position of the upper structure of the reactor vessel.

In an embodiment of the present invention, the fixing unit may include an actuator disposed on the second frame; and a fixing pin connected to the end of the rod of the actuator and fixed while making point contact with the inner surface of the reactor vessel.

Further, in an embodiment of the present invention, the fixing unit may include an actuator disposed on the second frame; a fixed beam connected to the rod end of the actuator; and a fixing plate disposed at an end of the fixing beam and fixed in surface contact with an inner surface of the reactor vessel, wherein a plurality of plate protrusions may be formed on the fixing plate.

According to the present invention, the reactor vessel is divided into two halves in response to the size of the nuclear reactor pool, which has spatial limitations in dismantling work, and dismantling equipment is appropriately arranged and dismantling work in air and water is performed in parallel, thereby preventing radiation exposure and stably dismantling the reactor vessel. There are technical features that can dismantle.

1 is a process flow chart showing a method of disassembling a nuclear reactor vessel according to the present invention.
Figure 2 is a detailed process flow chart for the first step disclosed in Figure 1;
Figure 3 is a detailed process flow chart for the second step disclosed in Figure 1;
4 is a plan view showing the structure of a nuclear reactor pool to which the present invention is applied;
5 is a side view showing a structure in which a reactor vessel is disposed in the nuclear reactor pool disclosed in FIG. 4;
6 is a view showing a process of arranging a band saw in a lower region of a nuclear reactor pool and cutting an upper structure of a reactor vessel with a circular saw according to the method of disassembling a reactor vessel according to the present invention.
7 is a view showing a process of cutting the upper structure of a reactor vessel in a band saw according to the method of disassembling a reactor vessel according to the present invention.
8 is a view showing a process of installing a jig in a lower region of a nuclear reactor pool and arranging substructures of a reactor vessel according to the method of disassembling a reactor vessel according to the present invention;
9 is a view showing a process of arranging band saws in a high area of a nuclear reactor pool according to the method of disassembling a reactor vessel according to the present invention.
10 is a view showing a process of dividing and cutting a lower structure of a reactor vessel into circular pieces according to the dismantling method of the reactor vessel according to the present invention.
11 is a view showing a process of cutting the lower structure of the reactor vessel divided and cut according to the method of disassembling the reactor vessel according to the present invention with a band saw.
12 is a view showing a process of completing the cutting of the lower structure of the reactor vessel with a band saw except for the lower head of the reactor vessel according to the dismantling method of the reactor vessel according to the present invention.
13 is a view showing a process of cutting the lower head of a reactor vessel with a circular saw according to the dismantling method of the reactor vessel according to the present invention.
14 is a side view showing the structure of a circular saw among dismantling devices for a nuclear reactor vessel according to the present invention;
15 is a plan view showing a first embodiment of a circular saw among dismantling devices for a nuclear reactor vessel according to the present invention;
16 is a plan view showing a second embodiment of a circular saw among dismantling devices for a nuclear reactor vessel according to the present invention;

Hereinafter, preferred embodiments of a method and apparatus for dismantling a reactor vessel according to the present invention will be described in detail with reference to the accompanying drawings.

Basically, the present invention can be applied when the reactor vessel 200 cannot be smoothly dismantled from the inside of the reactor pool 100 because the inner size of the reactor pool 100 is smaller than that of the reactor vessel 200 . For example, in the case where the height of the reactor pool 100 is not high enough compared to the height of the reactor vessel 200, the reactor vessel 200 has a spatial limitation in the disassembly of the reactor vessel 100. 200) can be applied to stably dismantle.

Referring to FIG. 4, a reactor pool 100 to which the present invention is applied is disclosed. The reactor pool 100 can be divided into a high region 110 and a low region 120, and the reactor vessel 200 Placement space 130 of may be formed in the high area (110).

In the present invention, the reactor vessel 200 is divided into two parts inside the reactor pool 100 shown in FIG. 4, and a band saw 500 is applied to the high region 110 and the low region 120 of the reactor pool 100. ) and a circular saw (600) are properly disposed to prevent radiation exposure through air and underwater dismantling work, and the reactor vessel 200 is stably dismantled.

Hereinafter, a disassembly method of the reactor vessel 200 according to the present invention will be described.

Referring to FIG. 1 , in the disassembly method of the reactor vessel 200 according to the present invention, the upper structure 210 of the reactor vessel 200 is cut in the air and moved to the lower region 120 of the reactor pool 100. First step of cutting and dismantling the lower structure 230 of the reactor vessel 200 to the lower region 120 of the reactor pool 100, then dividing and cutting the lower structure of the reactor vessel 200 It may include a second step of moving the reactor 230 to the high area 110 of the reactor pool 100 and disassembling it by cutting it in water, and a third step of packaging the dismantled reactor vessel 200. .

First of all, the first step relates to a process of dismantling the upper structure 210 of the reactor vessel 200 when dividing the reactor vessel 200 into two parts. The first step may be a step of cutting the superstructure 210 of the reactor vessel 200 in the air, moving it to the lower region 120 of the reactor pool 100, and disassembling it by cutting it in water.

Referring to FIGS. 2 and 5 to 7 , detailed processes of the first step are disclosed.

Specifically, in the first step, a step of installing the band saw 500 in the lower region 120 of the nuclear reactor pool 100 in the air may be performed. Referring to FIG. 6 , it can be seen that the band saw 500 is installed in the lower region 120 .

The band saw 500 includes a seating frame 430 on which the cut portion of the reactor vessel 200 is seated, and a rotation unit 433 capable of rotating the cut portion of the reactor vessel 200 on top of the seating frame 430. ) may be disposed, and a moving unit 431 capable of moving the cut portion of the reactor vessel 200 in a horizontal direction may be disposed below the seating frame 430 .

Next, a step of installing the shielding tent 310 and the blower 320 on the upper part of the reactor vessel 200 in the high region 110 of the reactor pool 100 in the air may be performed. This is to prevent radioactive dust from scattering before the upper structure 210 of the reactor vessel 200 is cut. The shielding tent 310 prevents scattering of radioactive dust and the like, and the blower 320 removes radioactive dust and the like.

At this time, a step of installing the circular saw 600 inside the reactor vessel 200 may be performed. The operator may then operate the circular saw 600 to cut the upper structure 210 of the reactor vessel 200.

In the present invention, the upper structure 210 of the reactor vessel 200 may mean the upper part of the nozzle 220 of the reactor vessel 200 . That is, the upper part of the nozzle 220 of the reactor vessel 200 can be cut with the circular saw 600 .

Here, the circular saw 600 may be connected to the contact sensor 681 by a link beam 682, and the contact sensor 681 is in contact with the upper part of the reactor vessel 200, and the upper structure of the reactor vessel 200 (210) The cutting position can be designated. A detailed configuration will be described with reference to FIGS. 14 to 16 .

After cutting the upper structure 210 of the reactor vessel 200 using the circular saw 600, a step of dismantling the shielding tent 310 and the blower 320 may be performed.

Subsequently, referring to FIG. 7 , the operator may perform a step of moving the upper structure 210 of the cut reactor vessel 200 to the band saw 500 .

Next, the operator may perform a step of installing the cover 330 in the arrangement space 130 of the reactor vessel 200 . This is to prevent water from entering into the arrangement space 130 of the reactor vessel 200 before filling the water to cut the upper structure 210 of the reactor vessel 200.

Now, the operator may perform a step of filling the reactor pool 100 with water W. Here, since the upper part of the arrangement space 130 of the reactor vessel 200 is covered with the cover 330, water does not flow in.

Next, a step of cutting and disassembling the cut upper structure 210 of the reactor vessel 200 with the band saw 500 may be performed.

After the dismantling of the upper structure 210 of the reactor vessel 200 is completed, a step of disassembling the band saw 500 in the lower region 120 of the reactor pool 100 may be performed.

In addition, a step of draining water from the inside of the nuclear reactor pool 100 may be performed. This is to drain water from the inside of the reactor pool 100 and to process the remaining reactor vessel 200 after removing the cover 330 .

Meanwhile, in the second step, the lower structure 230 of the reactor vessel 200 is moved to the lower region 120 of the reactor pool 100 and then divided and cut, and the lower structure 230 of the reactor vessel 200 that has been divided and cut ( 230) may be moved to the high area 110 of the nuclear reactor pool 100 and then dismantled by cutting in water.

First, the second step relates to a process of dismantling the lower structure 230 of the reactor vessel 200 when dividing the reactor vessel 200 into two parts. In the second step, the lower structure 230 of the reactor vessel 200 is cut underwater in the lower area 120 of the reactor vessel 200, moved to the higher area 110 of the reactor pool 100, and then chopped in water. It may be a dismantling step.

Referring to FIGS. 3 and 8 to 10 , detailed processes of the second step are disclosed.

Specifically, in the second step, referring to FIG. 8 , a step of installing the jig 450 in the lower region 120 of the nuclear reactor pool 100 may be performed. The jig 450 may be a structure for supporting the lower structure 230 of the reactor vessel 200 .

Next, a step of disassembling the cover 330 of the placement space 130 of the reactor vessel 200 may be performed. At this stage, the water is drained, and this stage is for taking out the remaining reactor vessel 200 from the arrangement space 130 of the reactor vessel 200.

Next, the operator may perform a step of cutting the nozzle 220 of the reactor vessel 200 . In order to smoothly take out the reactor vessel 200 from the arrangement space 130 of the reactor vessel 200, the nozzle 220 is removed.

Thereafter, the operator may perform a step of lifting the lower structure 230 of the reactor vessel 200 using a crane and placing it on the jig 450 . Referring to FIG. 8 , the lower structure 230 of the reactor vessel 200 disposed on the jig 450 can be confirmed.

Then, the operator may perform a step of installing the cover 330 on the upper part of the placement space 130 of the reactor vessel 200 . This is to prevent water from entering into the arrangement space 130 of the reactor vessel 200 .

Next, a worker may perform a step of filling water into the nuclear reactor pool 100 . This is to perform underwater disassembly of the lower structure 230 of the reactor vessel 200.

After installing the cover 330 and filling with water, referring to FIG. 9 , the operator may perform a step of installing the band saw 500 on the high area 110 of the nuclear reactor pool 100. . This is done by dividing and cutting the lower structure 230 of the reactor vessel 200 disposed in the lower region 120 to ? ケ ? After that, it is for cutting in the high area 110.

Next, referring to FIG. 10 , an operator may perform a step of installing the circular saw 600 inside the lower structure 230 of the reactor vessel 200 .

In addition, a step of dividing and cutting the lower structure 230 of the reactor vessel 200 with the circular saw 600 may be performed. Since the height of the reactor pool 100 is low, it is necessary to divide the lower structure 230 of the reactor vessel 200 into several pieces and cut them individually in order to avoid radiation exposure and carry out underwater dismantling work.

Next, referring to FIG. 11 , an operator may perform a step of moving the divided and cut lower structure 230 of the reactor vessel 200 to the band saw 500 using a crane.

Thereafter, the operator may perform a step of disassembling by cutting the lower structure 230 of the reactor vessel 200 divided and cut with the band saw 500 .

Referring to FIG. 12 , all of the lower structures 230 of the reactor vessel 200, except for the lower head 240, are divided and cut, so that the state in which they are cut can be confirmed.

Next, referring to FIG. 13 , an operator may move the lower head 240 of the reactor vessel 200 by a crane and place it on the seating frame 430 . At this time, the lower head 240 of the reactor vessel 200 may be cut and dismantled using the circular saw 600 .

Since the bottom surface of the lower head 240 of the reactor vessel 200 is curved, it is more efficient to cut it with the circular saw 600 rather than the band saw 500.

After completing the cutting work, the operator performs a step of dismantling the band saw 500 and the circular saw 600.

Finally, a step of draining water from the inside of the nuclear reactor pool 100 is performed.

Thereafter, when the operator performs the third step of packaging the reactor vessel 200 that has been cut and dismantled, the disassembly process of the reactor vessel 200 is completed.

In the dismantling method of the reactor vessel 200 according to the present invention, when the size of the reactor pool 100 is not large compared to the size of the reactor vessel 200, the reactor vessel 200 is divided into two parts and each is cut in stages, even in a narrow space. The reactor vessel 200 can be dismantled stably and efficiently.

Meanwhile, referring to FIGS. 14 to 16 , the structure of the circular saw 600 among dismantling devices of the reactor vessel 200 according to the present invention is disclosed.

The circular saw 600 constituting the disassembly device of the reactor vessel 200 according to the present invention includes a first frame 610, a cutting unit 630, a second frame 620, a fixing part 670, and a link beam 682 and a contact sensor 681.

The first frame 610 may have a structure in which a plurality of beams are connected to each other in a grid, and an extension unit 650 may be disposed at a lower end of the first frame 610 . In the present invention, the telescopic unit 650 may be an actuator, but is not limited thereto.

The cutting unit 630 may be configured to cut the reactor vessel 200, and the cutting unit 630 includes a saw motor 633, a circular blade 631, and a unit frame 632. It can be.

The saw motor 633 may be disposed on the first frame 610 . The circular blade 631 may be rotatably connected to the rotation shaft of the saw motor 633 . The unit frame 632 may be connected to the extension unit 650 and may support the circular blade 631 .

The unit frame 632 can move in the direction of the upper structure 210 of the reactor vessel 200 according to the expansion and contraction of the extension unit 650, and the circular blade 631 moves while the saw motor 633 operates. The reactor vessel 200 may be cut or shredded.

The second frame 620 may be connected to the first frame 610 through a rotation unit 640 . The rotation part 640 is disposed on the rotation frame 641 fixed to the upper part of the second frame 620 and the rotation frame 641, and the rotation shaft is connected to the lower end of the first frame 610, It may be configured to include a rotation drive unit 642 for rotating the first frame 610. In an embodiment of the present invention, the rotary driving unit 642 may be a motor, but is not limited thereto.

Here, a counterweight 660 may be disposed on the opposite side of the first frame 610 to the center of gravity on the opposite side of the cutting unit 630, but this is optional.

Next, the fixing part 670 may be disposed on the second frame 620 and fix the second frame 620 to the inside of the reactor vessel 200 .

Referring to FIG. 15 , the first embodiment of the fixing part 670 may include an actuator 675 and a fixing pin 671 . The actuator 675 may be disposed on the second frame 620 . Also, the fixing pin 671 may be connected to a rod end of the actuator 675 . A plurality of actuators 675 and fixing pins 671 may be disposed.

The rod of the actuator 675 is extended so that the fixing pin 671 contacts the inner surface of the reactor vessel 200 and the circular saw 600 can be fixed. At this time, the fixing pin 671 may be fixed while making point contact with the inner surface of the reactor vessel 200 .

Next, referring to FIG. 16 , the second embodiment of the fixing part 670 may include an actuator 675, a fixing beam 674, and a fixing plate 672. The actuator 675 may be disposed on the second frame 620 , and the fixing beam 674 may be connected to a rod end of the actuator 675 . Also, the fixing plate 672 may be disposed at an end of the fixing beam 674 .

When the rod of the actuator 675 is extended, the fixing beam 674 is extended, and accordingly, the fixing plate 672 contacts the inner surface of the reactor vessel 200 and the circular saw 600 can be fixed. . At this time, the fixing plate 672 may be fixed while making surface contact with the inner surface of the reactor vessel 200 .

Meanwhile, a plurality of plate protrusions 673 may be formed on the fixing plate 672, and the plurality of plate protrusions 673 press and contact the inner surface of the reactor vessel 200 to increase fixing force.

The circular saw 600 among disassembly devices of the reactor vessel 200 according to the present invention is stably fixed inside the reactor vessel 200 through the above-described configuration and can cut or shred the reactor vessel 200.

The above is merely a description of specific embodiments of the reactor vessel disassembly method and apparatus.

Therefore, it should be noted that those skilled in the art can easily understand that the present invention can be substituted or modified in various forms without departing from the spirit of the present invention described in the claims below. do.

100: reactor pool 110: high area
120: low area 130: arrangement space of the reactor vessel
200: reactor vessel 210: upper structure
220: nozzle 230: substructure
240: lower head
310: shielding tent 320: blower
330: cover 430: seating frame
431: moving unit 433: rotation unit
450: jig 500: band saw
600: circular saw 610: first frame
620: second frame 630: cutting unit
631: circular blade 632: unit frame
633: saw motor 640: rotating part
641: rotation frame 642: rotation drive unit
650: telescopic unit 660: counterweight
670: fixing part 671: fixing pin
672: fixed plate 673: plate protrusion
674: fixed beam 675: fixed actuator
681: contact sensor 682: link beam
W: water

Claims (14)

In the dismantling method of the reactor vessel,
The reactor pool is divided into a high area and a low area,
A first step of dismantling the superstructure of the reactor vessel by cutting it in air, moving it to the lower region, and cutting it in water;
a second step of moving the lower structure of the reactor vessel to the lower region and then dividing and cutting it; and
A third step of packaging the dismantled reactor vessel;
The first step is
Installing a band saw in the lower area;
installing a shielding tent and a blower on top of the reactor vessel in the high region;
Installing a circular saw inside the reactor vessel;
cutting the upper structure of the reactor vessel with a circular saw;
Dismantling the shielding tent and the blower;
Moving the cut upper structure of the reactor vessel to a band saw;
Installing a cover in the arrangement space of the reactor vessel; and
filling the inside of the nuclear reactor pool with water;
Dismantling method of a reactor vessel comprising a.
delete In the dismantling method of the reactor vessel,
The reactor pool is divided into a high area and a low area,
A first step of dismantling the superstructure of the reactor vessel by cutting it in air, moving it to the lower region, and cutting it in water;
a second step of moving the lower structure of the reactor vessel to the lower region and then dividing and cutting it; and
A third step of packaging the dismantled reactor vessel;
The first step is
Installing a band saw in the lower area;
installing a shielding tent and a blower on top of the reactor vessel in the high region;
Installing a circular saw inside the reactor vessel;
cutting the upper structure of the reactor vessel with a circular saw; and
Dismantling the shielding tent and the blower; Including,
The step of installing a circular saw inside the reactor vessel,
The circular saw is connected to a contact sensor by a link beam, and the contact sensor contacts an upper portion of the reactor vessel and designates a cutting position of an upper structure of the reactor vessel.
delete According to claim 1,
In the first step, after the step of filling the water,
Cutting and disassembling the cut upper structure of the reactor vessel with a band saw;
dismantling the band saw in the lower region; and
draining water from inside the reactor pool;
Dismantling method of the reactor vessel further comprising a.
According to claim 5,
In the second step, after draining the water,
installing a jig in the lower area;
Disassembling the cover;
cutting the nozzle of the reactor vessel; and
lifting the lower structure of the reactor vessel and placing it on the jig;
Dismantling method of a reactor vessel comprising a.
According to claim 6,
In the second step, after the step of lifting the lower structure of the reactor vessel and placing it on the jig,
Installing a cover on top of the arrangement space of the reactor vessel; and
filling the inside of the nuclear reactor pool with water;
Dismantling method of the reactor vessel further comprising a.
According to claim 7,
In the second step, after the step of filling the water,
Installing a band saw in the high area;
Installing a circular saw inside a lower structure of a reactor vessel; and
Dividing and cutting the lower structure of the reactor vessel with a circular saw;
Dismantling method of the reactor vessel further comprising a.
According to claim 8,
The second step, after the step of dividing and cutting the lower structure of the reactor vessel with the circular saw,
Moving the divided and cut substructure of the reactor vessel to a band saw;
Cutting and disassembling the lower structure of the reactor vessel, which has been divided and cut with a band saw;
Dismantling the band saw and the circular saw; and
draining water from inside the reactor pool;
Dismantling method of the reactor vessel further comprising a.
According to claim 9,
In the second step, when the lower structure of the reactor vessel is cut and dismantled,
A dismantling method of a reactor vessel, characterized in that the lower head of the lower structure of the reactor vessel is dismantled by cutting with a circular saw.
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