KR20220138244A - Method and apparatus for dismantling reactor vessel - Google Patents

Abstract

The present invention relates to a method for dismantling a reactor vessel, wherein a nuclear reactor pool is divided into a high area and a low area. The method includes: a first step of cutting an upper structure of the reactor vessel in the air and cutting and dismantling the cut upper structure into pieces in water after moving the same to the low area; and a second step of cutting a lower structure of the reactor vessel after moving the same to the low area, and cutting and dismantling an intermediate structure of the reactor vessel in water after moving the same to the high area; and a third step of packaging the dismantled reactor vessel. According to the present invention, it is possible to stably dismantle the reactor vessel while preventing exposure to radiation in the nuclear reactor pool having spatial limitations.

Description

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 reactor vessel capable of stably dismantling a reactor vessel in a nuclear reactor pool having spatial restrictions in dismantling operation.

In general, nuclear reactor facilities such as nuclear power plants are abolished when operation is completed. The above abolition measures are implemented in the order of system flame, safe storage of nuclear fuel, and decommissioning.

In the dismantling and demolition, the building is demolished after the internal pipe or equipment is removed. In the case of dismantling and demolition, it is necessary not to scatter radioactive materials to the outside, and it is necessary to prevent radiation exposure to workers engaged in dismantling and demolition.

Among the equipment, the removal of the reactor vessel is the most difficult. There are many processes and there is a risk of exposure to radiation, so safety should be the most important.

When the space of the reactor pool in which the reactor vessel is disposed is sufficiently wide, various devices necessary for the dismantling operation can be arranged with ease, which is advantageous in the dismantling operation.

However, when the space of the reactor pool is insufficient, for example, the height of the reactor pool is not significantly different from the height of the reactor vessel, it is difficult to arrange the dismantling devices and execute the dismantling process while preventing radiation exposure. In this case, a separate process that can dismantle the reactor vessel in a narrow space while maintaining safety is required.

Japanese Patent Registration Number: JP6788570B2

The present invention has been devised to solve the problems of the related art as described above, and an object of the present invention is a method of dismantling a reactor vessel capable of stably dismantling a reactor vessel in a reactor pool having a spatial limitation in dismantling operation. and to provide an apparatus.

The present invention for achieving the above objects relates to a method for dismantling a reactor vessel, wherein the reactor pool is divided into a high region and a low region, and after cutting the upper structure of the reactor vessel in the air and moving it to the low region A first step of dismantling by shredding; a second step of moving the substructure of the reactor vessel to the lower region and then cutting it, moving the substructure of the divided nuclear reactor vessel to the higher region, then shredding it in water to dismantle it; and a third step of packaging the disassembled reactor vessel.

In addition, in an embodiment of the present invention, the first step includes: installing a bandsaw in the low area; Installing a shielding tent and a blower on the upper portion of the reactor vessel in the high area; Installing a circular saw inside the reactor vessel; cutting the superstructure 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 a contact sensor by a link beam, the contact sensor is in contact with the upper portion of the reactor vessel, and the reactor vessel You can designate the cutting position of the superstructure.

In addition, in an embodiment of the present invention, the first step includes: after dismantling the shielding tent and the blower, moving the cut upper structure of the reactor vessel to the bandsaw; Installing a cover in the arrangement space of the reactor vessel; and adding water to the inside of the reactor pool; may further include.

In addition, in an embodiment of the present invention, the first step may include, after the step of refilling the water, slicing and dismantling the cut upper structure of the reactor vessel with a bandsaw; dismantling the bandsaw in the lower region; and draining water from the inside of the reactor pool.

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

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

In addition, in an embodiment of the present invention, the second step includes: after lifting the lower structure of the reactor vessel and arranging it on the jig, installing a cover on the upper part of the arrangement space of the reactor vessel; and adding water to the inside of the reactor pool; may further include.

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

In addition, in an embodiment of the present invention, the second step includes: after the step of dividing and cutting the substructure of the nuclear reactor vessel with the circular saw, moving the substructure of the divided and cut reactor vessel to the bandsaw; Dismantling the substructure of the nuclear reactor vessel divided into bandsaws by slicing; dismantling the bandsaw and the circular saw; and draining water from the inside of the reactor pool.

In addition, in the embodiment of the present invention, in the second step, when the substructure of the reactor vessel is shredded and disassembled, the lower head among the substructures of the reactor vessel may be disassembled by shredding with a circular saw.

The present invention also relates to a dismantling apparatus for a nuclear reactor vessel, the dismantling apparatus for a nuclear reactor vessel comprising a circular saw, the circular saw comprising: a first frame in which an expansion and contraction unit is disposed; a saw motor disposed on the first frame, a circular blade connected to a rotation shaft of the saw motor, and a cutting unit including a unit frame connected to the expansion and contraction unit and supporting the circular blade; a second frame connected to the first frame by a rotating unit; and a fixing part 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, a link beam connected to the 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 portion of the reactor vessel and may designate a cutting position of the upper structure of the reactor vessel.

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

In addition, in an embodiment of the present invention, the fixing unit includes 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 to the inner surface of the reactor vessel while in surface contact with the fixing plate.

According to the present invention, the reactor vessel is divided in half in response to the size of the reactor pool, which has spatial restrictions in the dismantling operation, and by properly disposing the dismantling equipment and dismantling in air and in water, the reactor vessel is stably prevented from radiation exposure. There are technical features that can be dismantled.

1 is a process flow chart showing a method for dismantling 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;
Figure 4 is a plan view showing the structure of the 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 reactor pool disclosed in FIG. 4;
6 is a view showing a process of disposing a bandsaw in a lower area of a reactor pool and cutting the upper structure of the reactor vessel with a circular saw according to the method of dismantling a reactor vessel according to the present invention;
7 is a view showing a process of slicing the upper structure of the reactor vessel in the bandsaw according to the method of dismantling the reactor vessel according to the present invention.
8 is a view showing a process of installing a jig in a lower area of a reactor pool and disposing a substructure of the reactor vessel according to the method of dismantling a reactor vessel according to the present invention.
9 is a view showing a process of arranging a bandsaw in a high area of a reactor pool according to the method of dismantling a reactor vessel according to the present invention.
10 is a view showing a process of dividing and cutting the lower structure of the reactor vessel into circular possession according to the method of dismantling the reactor vessel according to the present invention;
11 is a view showing a process of slicing the substructure of the divided nuclear reactor vessel with a bandsaw according to the method of dismantling the reactor vessel according to the present invention.
12 is a view showing a process in which the lower structure of the reactor vessel is cut with a bandsaw except for the lower head of the reactor vessel according to the method of dismantling the reactor vessel according to the present invention;
13 is a view showing a process of slicing the lower head of the reactor vessel with a circular saw according to the method of dismantling the reactor vessel according to the present invention.
14 is a side view showing the structure of a circular saw among the dismantling apparatus for a nuclear reactor vessel according to the present invention;
15 is a plan view showing a first embodiment of a circular saw of the present invention for dismantling a nuclear reactor vessel.
16 is a plan view showing a second embodiment of a circular saw of the present invention for dismantling a nuclear reactor vessel.

Hereinafter, preferred embodiments of a method and apparatus for dismantling a nuclear 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 to a case in which the reactor vessel 200 cannot be smoothly disassembled from the inside of the reactor pool 100 because the internal size of the reactor pool 100 is smaller than that of the reactor vessel 200 . For example, when the height of the reactor pool 100 is not sufficiently high compared to the height of the reactor vessel 200, there is a spatial limitation in the dismantling operation of the reactor vessel 200. Inside the reactor pool 100, the reactor vessel ( 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 may be divided into a high region 110 and a low region 120 , and the reactor vessel 200 . The arrangement space 130 may be formed in the high area 110 .

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

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

Referring to FIG. 1 , in the method of dismantling 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. In the first step of dismantling and slicing, the substructure 230 of the reactor vessel 200 is moved to the lower region 120 of the reactor pool 100 and then cut and divided into the substructure of the reactor vessel 200 After moving the 230 to the high area 110 of the nuclear reactor pool 100, it may be configured to include a second step of dismantling and shredding in water, and a third step of packaging the disassembled reactor vessel 200 . .

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

2 and 5 to 7 , the detailed process of the first step is disclosed.

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

The bandsaw 500 has 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 the upper portion of the seating frame 430 . ) may be disposed, and a moving unit 431 capable of horizontally moving the cut portion of the reactor vessel 200 may be disposed under the seating frame 430 .

Next, the step of installing the shielding tent 310 and the blower 320 on the upper portion of the reactor vessel 200 in the high area 110 of the reactor pool 100 in the air may be performed. This is to prevent scattering of radioactive dust before cutting the upper structure 210 of the reactor vessel 200 . 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, the 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 perform the step of cutting the upper structure 210 of the reactor vessel 200 .

In the present invention, the upper structure 210 of the reactor vessel 200 may mean an upper portion of the nozzle 220 of the reactor vessel 200 . That is, the upper portion of the nozzle 220 of the reactor vessel 200 may 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 portion of the reactor vessel 200 , and the upper structure of the reactor vessel 200 . (210) The cutting position can be specified. 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 , the step of dismantling the shielding tent 310 and the blower 320 may be performed.

Thereafter, referring to FIG. 7 , an operator may perform a step of moving the cut upper structure 210 of the reactor vessel 200 to the bandsaw 500 .

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

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

Next, the step of slicing and dismantling the upper structure 210 of the cut reactor vessel 200 with the bandsaw 500 may be performed.

When the dismantling operation of the upper structure 210 of the reactor vessel 200 is finished, the step of disassembling the bandsaw 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 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 .

On the other hand, in the second step, the substructure 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 substructure of the divided and cut reactor vessel 200 ( After moving the 230 to the high area 110 of the nuclear reactor pool 100, it may be a step of dismantling it by shredding it in water.

First, the second step relates to a process of disassembling the lower structure 230 of the reactor vessel 200 when the reactor vessel 200 is divided into two. In the second step, the substructure 230 of the reactor vessel 200 is cut underwater in the lower region 120 of the reactor vessel 200, moved to the high region 110 of the reactor pool 100, and then cut in water. This may be a dismantling step.

3 and 8 to 10 , the detailed process of the second step is disclosed.

Specifically, in the second step, first, referring to FIG. 8 , the step of installing the jig 450 in the lower area 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 nuclear reactor vessel 200 .

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

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

Thereafter, the operator may perform a step of lifting the lower structure 230 of the reactor vessel 200 using a crane and arranging 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 seen.

In addition, the operator may perform the step of installing the cover 330 on the arrangement space 130 of the reactor vessel 200 . This is to prevent water from flowing into the arrangement space 130 of the reactor vessel 200 .

Next, the operator may perform the step of filling the inside of the reactor pool 100 with water. This is to perform an underwater dismantling operation for 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 the step of installing the bandsaw 500 in 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 ? After that, it is to be cut 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 .

Then, the 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 substructure 230 of the reactor vessel 200 into several pieces to avoid radiation exposure and to perform the underwater dismantling work, and it is necessary to cut it individually.

Next, referring to FIG. 11 , an operator may perform a step of moving the substructure 230 of the divided nuclear reactor vessel 200 to the bandsaw 500 using a crane.

Thereafter, the operator may perform a step of dismantling the substructure 230 of the nuclear reactor vessel 200 divided by the band saw 500 .

Referring to FIG. 12 , all of the substructures 230 of the nuclear reactor vessel 200 except for the lower head 240 are divided and cut into pieces.

Next, referring to FIG. 13 , the operator may move the lower head 240 of the nuclear reactor vessel 200 with a crane and place it on the seating frame 430 . And at this time, the lower head 240 of the reactor vessel 200 may be cut and disassembled using the circular saw 600 .

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

After completion of the shredding operation, the operator performs the step of dismantling the band saw 500 and the circular saw 600 .

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

Thereafter, when the operator performs the third step of packaging the shredded and dismantled reactor vessel 200 , the dismantling process of the reactor vessel 200 is completed.

In the method of dismantling 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 and each is cut in stages, so that even in a narrow space It is possible to dismantle the reactor vessel 200 stably and efficiently.

On the other hand, referring to FIGS. 14 to 16 , the structure of the circular saw 600 among the dismantling apparatuses of the nuclear reactor vessel 200 according to the present invention is disclosed.

The circular saw 600 constituting the dismantling device of the present invention reactor vessel 200 includes a first frame 610, a cutting unit 630, a second frame 620, a fixing part 670, and a link beam 682. And it may be configured to include 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 a telescopic unit 650 may be disposed at a lower end of the first frame 610 . In the present invention, the expansion 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 . 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 expansion and contraction unit 650, and may support the circular blade (631).

According to the expansion and contraction of the expansion unit 650, the unit frame 632 may move in the direction of the upper structure 210 of the reactor vessel 200, and the circular blade 631 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 by a rotating part 640 . The rotating unit 640 is disposed on the rotating frame 641 and the rotating frame 641 fixed to the upper portion of the second frame 620, and the rotating shaft is connected to the lower end of the first frame 610, and the It may be configured to include a rotation driving unit 642 for rotating the first frame (610). In an embodiment of the present invention, the rotation driving unit 642 may be a motor, but is not limited thereto.

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

Next, the fixing part 670 may be disposed on the second frame 620 , and the second frame 620 may be fixed 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 . And the fixing pin 671 may be connected to the rod end of the actuator (675). A plurality of the actuators 675 and the 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 may be fixed. At this time, the fixing pin 671 may be fixed in 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 fixed beam 674 may be connected to a rod end of the actuator 675 . In addition, the fixing plate 672 may be disposed at an end of the fixing beam 674 .

When the rod of the actuator 675 is elongated, the fixed beam 674 is elongated. Accordingly, the fixed plate 672 is in contact with 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 in surface contact with the inner surface of the reactor vessel 200 .

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

The circular saw 600 among the dismantling 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 the reactor vessel 200 can be cut or shredded.

The above is merely a specific example of a method and apparatus for dismantling a reactor vessel.

Therefore, within the limits that do not depart from the spirit of the present invention described in the following claims, the present invention can be substituted and modified in various forms to clarify that those of ordinary skill in the art can easily grasp that do.

100: reactor pool 110: high area
120: low area 130: arrangement space of the reactor vessel
200: reactor vessel 210: superstructure
220: nozzle 230: substructure
240: lower head
310: shielding tent 320: blower
330: cover 430: seating frame
431: moving unit 433: rotating unit
450: jig 500: bandsaw
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: rotating frame 642: rotating drive unit
650: expansion unit 660: counterweight
670: fixing part 671: fixing pin
672: fixed plate 673: plate projection
674: fixed beam 675: fixed actuator
681: contact sensor 682: link beam
W: water

Claims (14)

In the method of dismantling a nuclear 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 the air, moving it to the lower region, and then shredding it in water;
a second step of moving the substructure of the reactor vessel to the lower region and then cutting it, moving the substructure of the divided nuclear reactor vessel to the higher region, then shredding it in water to dismantle it; and
a third step of packaging the disassembled reactor vessel;
A method of dismantling a reactor vessel comprising a.
According to claim 1,
The first step is
installing a bandsaw in the lower area;
Installing a shielding tent and a blower on the upper portion of the reactor vessel in the high area;
Installing a circular saw inside the reactor vessel;
cutting the superstructure of the reactor vessel with a circular saw; and
Dismantling the shielding tent and the blower;
A method of dismantling a reactor vessel comprising a.
3. The method of claim 2,
The step of installing the circular saw inside the reactor vessel,
The circular saw is connected to a contact sensor by a link beam, the contact sensor is in contact with the upper portion of the reactor vessel, and the reactor vessel dismantling method, characterized in that the cut position of the upper structure of the reactor vessel is designated.
3. The method of claim 2,
The first step, after the step of dismantling the shielding tent and the blower,
moving the cut upper structure of the reactor vessel to a bandsaw;
Installing a cover in the arrangement space of the reactor vessel; and
adding water to the inside of the reactor pool;
Dismantling method of the reactor vessel further comprising a.
5. The method of claim 4,
The first step, after the step of filling the water,
slicing and dismantling the superstructure of the cut reactor vessel with a bandsaw;
dismantling the bandsaw in the lower region; and
draining water from the inside of the reactor pool;
Dismantling method of the reactor vessel further comprising a.
6. The method of claim 5,
The second step, after the step of draining the water,
installing a jig in the lower area;
disassembling the cover;
cutting the nozzle of the reactor vessel; and
lifting the substructure of the reactor vessel and placing it on the jig;
A method of dismantling a reactor vessel comprising a.
7. The method of claim 6,
The second step is, after the step of lifting the substructure of the reactor vessel and arranging it on the jig,
installing a cover on the upper portion of the arrangement space of the reactor vessel; and
adding water to the inside of the reactor pool;
Dismantling method of the reactor vessel further comprising a.
8. The method of claim 7,
The second step, after the step of filling the water,
installing a bandsaw in the high area;
Installing the circular saw inside the lower structure of the reactor vessel; and
dividing and cutting the substructure of the reactor vessel with a circular saw;
Dismantling method of the reactor vessel further comprising a.
9. The method of claim 8,
The second step is, after the step of dividing and cutting the lower structure of the reactor vessel with the circular saw,
moving the substructure of the divided nuclear reactor vessel to a bandsaw;
Dismantling the substructure of the nuclear reactor vessel divided into bandsaws by slicing;
dismantling the bandsaw and the circular saw; and
draining water from the inside of the reactor pool;
Dismantling method of the reactor vessel further comprising a.
10. The method of claim 9,
The second step, when dismantling the substructure of the reactor vessel,
A method of dismantling a reactor vessel, characterized in that the lower head of the substructure of the reactor vessel is disassembled by cutting it with a circular saw.
In the dismantling device of a nuclear reactor vessel,
The dismantling device of the reactor vessel includes a circular saw,
The circular saw,
a first frame in which the telescopic unit is disposed;
a saw motor disposed on the first frame, a circular blade connected to a rotation shaft of the saw motor, and a cutting unit including a unit frame connected to the expansion and contraction unit and supporting the circular blade;
a second frame connected to the first frame by a rotating unit; and
a fixing part disposed on the second frame and fixing the second frame to the inside of the reactor vessel;
A dismantling device for a reactor vessel comprising a.
12. The method of claim 11,
The circular saw,
a link beam connected to an upper portion of the first frame; and
Including; a contact sensor disposed on the link beam;
The reactor vessel dismantling apparatus, characterized in that the contact sensor is in contact with the upper part of the reactor vessel and designates a cutting position of the upper structure of the reactor vessel.
12. The method of claim 11,
The fixing part,
an actuator disposed on the second frame; and
a fixing pin connected to the rod end of the actuator and fixed in point contact with the inner surface of the reactor vessel;
A dismantling device for a reactor vessel comprising a.
12. The method of claim 11,
The fixing part,
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 the inner surface of the reactor vessel;
A dismantling apparatus for a nuclear reactor vessel, characterized in that a plurality of plate projections are formed on the fixed plate.

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