JP2005331245A - Nuclear reactor building interior work assisting device and nuclear reactor building interior work method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute work such as inspections, repairs for an object point inside a reactor well simultaneously/in parallel with work such as fuel exchange, without using refueling machines. <P>SOLUTION: This nuclear reactor intra-building work assist device disposed within a nuclear reactor building comprises a platform 501, a platform support structure 502, and handrails 504. The platform 501 is disposed inside an operation floor opening 1020 so that its upper surface is positioned at substantially the same height as an upper surface of an operation floor 1001 and has a platform opening 1021, comprising a circular opening part 1022 substantially of the same size as an inner diameter of a reactor pressure vessel 1007 and a platform opening 1021 made up of an opening part 503 for refueling machine mast passage that communicates with the opening part 1022. The support structure 502 supports the platform 501. The handrails 504 are disposed on the platform 501 along the opening 1021. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reactor building work auxiliary device and a reactor building work method, and in particular, when the reactor is shut down, the upper part of the reactor pressure vessel is opened and water is filled in and above the reactor pressure vessel. The present invention relates to an apparatus and a working method suitable for a work in which a working device is suspended in a reactor pressure vessel from above a water surface and operated above the water surface.

  In general, when working inside a reactor building when the reactor is shut down, use a fuel changer installed on the operation floor, suspend inspection and work equipment such as cameras and lighting from the passage of the fuel changer inside the reactor, and inspect it. The work in the furnace, such as inspection and repair, is performed by approaching the vicinity of the target part.

As such a reactor building work auxiliary device, for example, there is a fuel changer (see Patent Document 1).
Japanese Patent Laid-Open No. 10-148697

  In the above-described reactor building work auxiliary device, since it is used at the time of fuel exchange, it has been a problem that it is impossible to perform in-reactor inspection during fuel exchange. In addition, there is a problem that there are many cases where it is impossible to inspect two distant points at the same time in parallel at the time of inspection inside the nuclear reactor.

  The present invention has been made in order to solve the above-described problems, and without using a fuel changer, in parallel with work such as fuel change, work such as inspection and repair on a target part in a reactor well is performed. It is an object to provide a method and apparatus that can be implemented.

  The present invention achieves the above object, and the invention according to claim 1 is characterized in that an operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and the reactor pressure In the reactor building indoor work auxiliary device installed inside the reactor building that accommodates the vessel, the upper surface of the reactor building is located at substantially the same height as the upper surface of the operation floor inside the operation floor opening, and the reactor pressure vessel A platform formed with a circular opening having a circular opening substantially the same as the inner diameter of the cylinder and a refueling machine mast passage opening communicating with the circular opening, a platform support structure for supporting the platform, and the platform And a handrail disposed along the platform opening. It is characterized in.

  According to the second aspect of the present invention, an operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and is installed in a reactor building that houses the reactor pressure vessel. In the reactor building work auxiliary device, a circular opening that is arranged inside the opening of the operation floor and that is approximately the same size as the inner diameter of the reactor pressure vessel, and a refueling machine mast passage that communicates with the circular opening. A platform having a platform opening formed of an opening; a dam is provided along an outer periphery of the platform and along the platform opening; and the platform is configured to receive buoyancy by water in contact with a bottom surface of the platform. It is characterized by that.

  According to a third aspect of the present invention, an operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and is installed inside a reactor building that houses the reactor pressure vessel. In the reactor building work assistance apparatus, a platform arranged inside the opening of the operation floor and configured to receive buoyancy by water in contact with the bottom surface, and a jumper plate arranged between the platform and the operation floor It is characterized by having.

  According to the ninth aspect of the present invention, an operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and is installed in a reactor building that accommodates the reactor pressure vessel. In a reactor building work auxiliary device, a cable that is arranged inside the opening of the operation floor, is configured to receive buoyancy by water in contact with the bottom surface, and is equipped with a cable processing unit capable of winding and delivering the cable. And a positioning mast arranged to communicate between the cable processing device and the operation floor, the length of the positioning mast being variable.

  According to a tenth aspect of the present invention, an operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and is installed in a reactor building that accommodates the reactor pressure vessel. A guide rail having a float arranged to extend substantially horizontally inside the opening of the operation floor and having a float for receiving buoyancy by water in contact with the bottom surface, and the guide rail along the guide rail A moving trolley; and a cable processing device attached to the trolley and capable of winding and delivering a cable extending downward from the operation floor opening.

  Further, the invention according to claim 11 opens the reactor pressure vessel when the reactor is shut down to fill the reactor pressure vessel with water, and fills the reactor pressure vessel from above the water surface. In a reactor building working method in which a working device is suspended inside and the working device is operated above the water surface, an upper surface is provided inside the operation floor opening provided above the reactor pressure vessel on the operation floor. Has a platform opening consisting of a circular opening substantially the same height as the upper surface of the operation floor and approximately the same size as the inner diameter of the reactor pressure vessel, and an opening for passing through a fuel exchanger mast communicating with the circular opening. Forming a platform and a platform support structure for supporting the platform, And down hanging the work device to said reactor pressure vessel, manipulating the working device, and it said.

  In the invention according to claim 12, the reactor pressure vessel is opened from above the water surface by opening the upper portion of the reactor pressure vessel when the reactor is shut down to fill water in and above the reactor pressure vessel. In the reactor building working method in which the working device is suspended inside and the working device is operated above the water surface, a circular shape having the same size as the inner diameter of the reactor pressure vessel is provided inside the operation floor opening. A platform opening consisting of an opening and an opening for passing through a refueling machine mast communicating with the circular opening is formed, and a weir is provided along the outer periphery and the platform opening, and configured to receive buoyancy by water in contact with the bottom surface A working platform is formed, and the working device is suspended in the reactor pressure vessel from above the platform. Operation is possible, characterized by.

  In the invention according to claim 13, the reactor pressure vessel is opened from above the water surface by opening the top of the reactor pressure vessel when the reactor is shut down to fill water in and above the reactor pressure vessel. In a reactor building working method in which a working device is suspended inside and the working device is operated above the water surface, the platform is configured to receive buoyancy by water in contact with the bottom surface inside the operation floor opening. And a crossing plate is disposed between the platform and the operation floor, the working device is suspended in the reactor pressure vessel from above the platform, and the working device is operated. .

  In the invention described in claim 14, when the reactor is shut down, the upper part of the reactor pressure vessel is opened to fill the reactor pressure vessel with water, and the reactor pressure vessel is filled from above the water surface. In a reactor building working method in which a working device is suspended inside and the said working device is operated above the water surface, the cable is configured to receive buoyancy by water in contact with the bottom surface inside the operation floor opening. A cable processing device having a cable processing unit capable of winding and feeding is disposed, a positioning mast having a variable length is disposed so as to communicate between the cable processing device and the operation floor, and the cable processing The working device is suspended from the device into the reactor pressure vessel, and the working device is operated.

  In the invention described in claim 15, the reactor pressure vessel is opened from above the water surface by opening the top of the reactor pressure vessel when the reactor is shut down to fill water in and above the reactor pressure vessel. In the reactor building work method of operating the work device above the water surface by suspending the work device in the interior of the reactor building, the inside of the operation floor opening has a float for receiving buoyancy by water in contact with the bottom surface The guide rail extending substantially horizontally is disposed, the trolley is moved along the guide rail, and the cable extending downward from the trolley through the opening of the operation floor is taken up and sent out.

  According to the present invention, it is possible to carry out work such as inspection / repair on the target portion in the reactor well in parallel with work such as fuel exchange without using a fuel changer.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a work assistance method and apparatus according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, a first embodiment will be described with reference to FIG. A substantially cylindrical reactor pressure vessel 1007 is arranged in the reactor building, and an operation floor 1001 is arranged in the reactor building above the reactor pressure vessel 1007. A substantially circular operation floor opening 1020 is formed above the reactor pressure vessel 1007 on the operation floor 1001.

  When the reactor is shut down, water is filled in the reactor well 1004 inside the reactor pressure vessel 1007 and above the reactor pressure vessel 1007. The entire platform 501 is disposed inside the operation floor opening 1020 so that the floor is positioned at a level substantially the same as the operation floor 1001 and higher than the water surface stretched on the reactor well 1004. The full platform 501 is supported by a platform support structure 502.

  The entire platform 501 is provided with a platform opening 1021. The platform opening 1021 includes a circular opening 1022 and a refueling machine mast passage opening 503 communicating with the circular opening 1022. The circular opening 1022 is an opening having a size almost equal to the inner diameter of the reactor pressure vessel 1007 immediately above the reactor pressure vessel 1007. The fuel changer mast passage opening 503 is an opening through which a main hoist (not shown) of the fuel changer passes. A handrail 504 is provided around the platform opening 1021 above the entire platform 501 to prevent a worker from falling from the entire platform 501 to the reactor well 1004.

  In FIG. 1, reference numeral 1002 denotes a fuel pool, 1003 denotes a dryer separator pit, 1005 denotes a fuel canal, 1006 denotes a fuel exchanger moving rail, and 1008 denotes a reactor pressure vessel stud.

  In the present embodiment configured as described above, a worker who checks the inside of the nuclear reactor can approach the reactor pressure vessel 1007 near the outer periphery without using a fuel exchanger. Therefore, it becomes possible to insert work devices (tools) such as a camera for inspecting and repairing the inside of the reactor into the reactor without using a fuel changer, and to perform inspection and repair work, Inspection and repair work inside the reactor during refueling becomes possible. Also, since the worker can approach the reactor directly from all directions except the opening 503 for passing through the fuel changer mast, it is possible to perform a plurality of in-reactor operations such as in-reactor inspection and repair in parallel. .

[Second Embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted. The second embodiment includes a platform 511 and a handrail (weir) 512. The floor surface of the platform 511 is set at a position lower than the water surface stretched on the reactor well 1004. The platform 511 is arranged inside the operation floor opening 1020 and has a platform opening 1021 as in the case of the entire platform 501 of the first embodiment. The platform opening 1021 includes a projecting portion (circular opening) 1022 upward of the inner diameter of the reactor pressure vessel 1007 and a passage 503 for passing a main hoist of the fuel exchanger. Further, a handrail 512 is provided along the outer periphery of the platform 511 and the platform opening 1021 to such a height that the water in the reactor well 1004 does not enter. The handrail 512 also functions as a weir and is watertight between the floor surface.

  In the present embodiment configured as described above, the edge on the center side of the submerged platform 511 is almost equal to the inner diameter of the reactor pressure vessel 1007 and is directly above. Access is possible directly above the vicinity of the outer periphery of 1007 without using a fuel changer. For this reason, it is possible to carry out work such as inspection and repair by introducing a working device (tool) such as a camera for inspecting and repairing the inside of the reactor into the reactor without using a fuel changer. Inspection and repair work inside the reactor during refueling becomes possible. Also, since the worker can approach the reactor directly from all directions except the opening 503 for passing through the fuel changer mast, it is possible to perform a plurality of in-reactor operations such as in-reactor inspection and repair in parallel. . Further, since the submerged platform 511 is submerged, buoyancy is generated. Therefore, the structure for supporting the weight of the submerged platform 511 can be simplified.

[Third Embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as previous embodiment, and the overlapping description is abbreviate | omitted.

  In the present embodiment, a floating platform 521 is disposed inside the operation floor opening 1020. A float 530 capable of adjusting the buoyancy by taking in and out of the reactor water is disposed at the bottom of the platform 521.

  The operation floor 1001 and the platform 521 communicate with each other by an extendable parallel link 527 and a jumper plate 523 attached to the parallel link 527. Preferably, the parallel link 527 and the bridge plate 523 have the same length and are parallel to each other so that they can expand and contract in synchronization. The parallel link 527 is fixed to the parallel link fixing portion 526. Preferably, when installing or fixing the floating platform 521, a handrail attachment portion around the reactor well 1004 of the operation floor 1001 is used. A movement guide rail 528 for moving the entire floating platform 521 attached to the parallel link fixing portion 526 is provided on the operation floor 1001.

  Although only the float 530 at the bottom of the floating platform 521 is shown in the figure, a float may be attached to the crossover plate 523, and the float is placed on the side of the floating platform 521 or the crossover plate 523 to increase stability. May be attached.

  A movable moving trolley 535 is attached to the front surface of the floating platform 521, and a guide moving rail 531 that can be rotated by a guide moving rail rotating unit 534 is attached to the moving trolley 535. A hanging guide 532 that can move along the guide moving rail 531 is attached to the guide moving rail 531. The hanging guide 532 is movable along the guide moving rail 531.

  In the present embodiment configured as described above, the operator can freely travel on the crossing plate 523, thereby reciprocating between the operation floor 1001 and the floating platform 521.

  The moving guide rail 528 can move the parallel link attached to the parallel link fixing portion 526 or the entire floating platform in the reactor well 1004. By connecting the parallel link fixing portion 526 and the floating platform 521 with the telescopic parallel link, the influence of the force change due to the vertical movement that occurs when equipment and workers get on and off the floating platform is reduced. The structure of the fixing portion 526 can be simplified and a low-rigidity structure.

  A moving trolley 535, a guide moving rail 531, and a suspension guide 532 attached to the front surface of the floating platform 521 are used when a working device (inspection / working tool) 601 such as a camera is suspended from the floating platform by the cable 602. The inspection / work tool 601 can be suspended at a position away from the floating platform 521. The float 530 attached to the bottom of the floating platform adjusts the change in the height draft that occurs when equipment or workers get on and off the floating platform by changing the amount of air inside. It is possible to keep the draft of the platform constant and facilitate inspection and repair work.

  In the working apparatus configured as described above, since the force acting on the operation floor 1001 due to the influence of the equipment and buoyancy is small, the entire apparatus can be reduced in size. Further, since the position of the floating platform can be changed by the guide moving rail 531, the hanging guide 532, the moving trolley 535, or the moving guide rail, inspection and work can be performed, so that a wide area of the reactor pressure vessel 1007 can be obtained with a small number of equipment. It becomes accessible.

[Fourth Embodiment]
Next, a fourth embodiment according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as previous embodiment, and the overlapping description is abbreviate | omitted.

  In the present embodiment, a float 558 is attached to the bottom of the platform 557 floated on the reactor well 1004. The platform 557 and the operation floor 1001 are connected to each other by a plurality of connecting plates 554 connected in series. A transition board 554 connected to the operation floor 1001 is coupled to the operation floor fixing portion 552. There is a rotation shaft 555 at the connecting portions between the transition plates 554 and between the transition plates 554 and the platform 557 so that they can rotate relatively. In addition, a connecting portion between the crossing plate 554 and the platform 557 has a vertical shaft 556 that enables relative movement in the vertical direction. Thereby, the change of the draft when a person gets on and off can be absorbed.

  In the present embodiment configured as described above, the platform 557 provides a scaffold for workers and a place for handling the apparatus instead of the conventional refueling machine. The vertical axis 556 moves up and down in accordance with changes in the draft that occur when a person or equipment gets on or off the platform. The transition board 554 moves the position of the platform 557 relative to the operation floor fixing portion 552 by rotating the shaft.

  According to the present embodiment, it is possible to freely change the position of the platform 557 by moving the crossover plate 554, and it is possible to access a wide area inside the reactor without using a fuel changer.

  Note that the number of the transition plate 554 may be only one, or a float for adjusting the buoyancy may be attached to the transition plate 554.

[Fifth Embodiment]
Next, a fifth embodiment of a reactor building work auxiliary device according to the present invention will be described with reference to FIGS.

  In the present embodiment, a floating cable processing device 577 is disposed on the water surface of the reactor well 1004, and a cable processing drum 576 is mounted on the floating cable processing device 577. One end of each of the first positioning mast 572, the second positioning mast 573, and the third positioning mast 574 is fixed to the floating cable processing device 577, and the first positioning mast 572, the second positioning mast 573, and Each other end of the third positioning mast 574 is fixed to an operation floor fixing portion 571 fixed to the operation floor 1001.

  The first positioning mast 572, the second positioning mast 573, and the third positioning mast 574 can be individually expanded and contracted, thereby uniquely determining the position and azimuth angle of the floating cable processing device 577 in the horizontal plane. be able to.

  The cable processing drum 576 mounted on the floating cable processing device 577 rotates or moves the cable of the inspection device or the repair device that is lowered into the furnace for inspection or work.

  According to the present embodiment, a worker operates on the operation floor 1001 to input and position a work tool used for inspection or repair in the nuclear reactor without using a fuel changer. Therefore, it is possible to carry out inspection and repair work in the nuclear reactor without using a fuel changer. In addition, by applying a plurality of similar devices, it becomes possible to carry out inspections inside the reactor in parallel.

  A floating working scaffold (not shown) is floated on the reactor well 1004, and an operator hangs an inspection / working device such as a camera in the reactor from the working scaffold to perform in-react work such as inspection. You can also. In addition, using a rail (not shown) attached to the operation floor 1001 on the work scaffold, the position of the work scaffold can be changed to perform the work in the furnace.

[Sixth Embodiment]
Next, a sixth embodiment of a reactor building work auxiliary device according to the present invention will be described with reference to FIG. In the present embodiment, one or a plurality of floats 581 are disposed on the water surface of the reactor well 1004, and a split type guide rail 580 supported near the water surface by the float 581 extends horizontally. Further, the trolley 582 can travel on the guide rail 580, and a cable processing unit 583 is mounted on the trolley 582.

  In the present embodiment configured as described above, the float 581 supports the split-type guide rail 580 at a height near the water surface. The trolley 582 moves along the guide rail 580, and a cable processing unit 583 installed on the trolley 582 winds up and sends out a cable of an inspection apparatus such as a suspended camera.

  According to the present embodiment, it is possible to access the cable in a wide area inside the reactor without using a fuel changer.

  Note that the trolley can be moved using a curve at the edge of the reactor well 1004 on the operation floor 1001 as a guide rail.

1 is a partially cutaway perspective view of a first embodiment of a reactor building work auxiliary device according to the present invention. FIG. The partial notch perspective view of 2nd Embodiment of the reactor building work auxiliary device which concerns on this invention. The perspective view of 3rd Embodiment of the reactor building indoor work assistance apparatus which concerns on this invention. The partial notch perspective view which shows the condition which installed the reactor building work auxiliary | assistance apparatus of FIG. 3 in the reactor building. The perspective view of 4th Embodiment of the reactor building work auxiliary device which concerns on this invention. The partial notch perspective view which shows the condition which installed the reactor building work auxiliary | assistance apparatus of FIG. 5 in the reactor building. The perspective view of 5th Embodiment of the reactor building indoor work auxiliary device which concerns on this invention. The partial notch perspective view which shows the condition which installed the reactor building work auxiliary | assistance apparatus of FIG. 7 in the reactor building. The partial notch perspective view of 6th Embodiment of the reactor building work auxiliary device which concerns on this invention.

Explanation of symbols

501 ... Full-scale platform (platform), 502 ... Platform support structure, 503 ... Opening for fuel changer mast passage, 504 ... Handrail, 511 ... Submerged platform, 512 ... Handrail (weir), 521 ... Floating platform, 523 ... Crossover plate, 526 ... Parallel link fixing part, 527 ... Parallel link, 528 ... Moving guide rail, 529 ... Handrail fixing bolt hole, 530 ... Float, 531 ... Guide moving rail, 532 ... Suspension guide, 533 ... Moving roller, 534 ... Guide moving rail rotating shaft, 535 ... Moving trolley, 551 ... Arm type platform, 552 ... Operation floor fixing part, 554 ... Bridge plate, 555 ... Rotating shaft, 556 ... Up / down axis, 557 ... Platform, 558 ... Float, 571 ... Operation Flow Fixed portion, 572 ... first telescopic mast, 573 ... second telescopic mast, 574 ... third telescopic mast, 576 ... cable processing drum, 576 ... floating cable processing device, 580 ... guide rail, 581 ... float, 582 ... Trolley, 583 ... Cable processing unit, 601 ... Inspection / working device, 602 ... Cable, 1001 ... Operation floor, 1002 ... Fuel pool, 1003 ... Dryer / separator pit, 1004 ... Reactor well, 1005 ... Fuel canal, 1006 ... Fuel changer moving rail, 1007 ... Reactor pressure vessel, 1008 ... Reactor pressure vessel stud, 1020 ... Operation floor opening, 1021 ... Platform opening, 1022 ... Circular opening

Claims (15)

An operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and in the reactor building work auxiliary equipment installed inside the reactor building that houses the reactor pressure vessel,
A circular opening having an upper surface disposed substantially at the same height as the upper surface of the operation floor inside the operation floor opening and having a size approximately equal to the inner diameter of the reactor pressure vessel and a refueling machine mast communicating with the circular opening A platform having a platform opening formed of a passage opening; and
A platform support structure for supporting the platform;
A handrail disposed on the platform along the platform opening;
A reactor building work auxiliary device characterized by comprising: An operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and in the reactor building work auxiliary equipment installed inside the reactor building that houses the reactor pressure vessel,
A platform disposed inside the operation floor opening and formed with a platform opening comprising a circular opening having a size substantially equal to the inner diameter of the reactor pressure vessel and an opening for passing through a fuel exchanger mast communicating with the circular opening. Have
A dam is provided along an outer periphery of the platform and along the platform opening, and the platform is configured to receive buoyancy by water in contact with a bottom surface of the platform;
Reactor building work auxiliary equipment characterized by. An operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and in the reactor building work auxiliary equipment installed inside the reactor building that houses the reactor pressure vessel,
A platform disposed inside the operation floor opening and configured to receive buoyancy by water contacting the bottom surface;
A transition board disposed between the platform and the operation floor;
A reactor building work auxiliary device characterized by comprising:   4. The reactor building work assisting apparatus according to claim 3, wherein a parallel link connecting the operation floor and the platform is disposed in parallel to the bridge plate.   The reactor building work auxiliary device according to claim 3, further comprising a guide mechanism for suspending the inspection device or the work device at a position horizontally separated from a tip of the platform.   4. The reactor building work assistance according to claim 3, wherein a guide rail extending substantially horizontally is installed on the operation floor, and the platform and the bridge plate are configured to move along the guide rail. 5. apparatus.   The reactor building work auxiliary device according to claim 3, wherein the crossing plate is configured to be rotatable about a vertical axis with respect to at least one of the platform and the operation floor.   4. The reactor building work auxiliary device according to claim 3, wherein the transition board has a float that receives buoyancy. An operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and in the reactor building work auxiliary equipment installed inside the reactor building that houses the reactor pressure vessel,
A cable processing device that is arranged inside the operation floor opening, is configured to receive buoyancy by water contacting the bottom surface, and is equipped with a cable processing unit capable of winding and sending out the cable;
A positioning mast arranged to communicate between the cable processing device and the operation floor and capable of changing its length;
A reactor building work auxiliary device characterized by comprising: An operation floor having an operation floor opening is disposed above a substantially cylindrical reactor pressure vessel, and in the reactor building work auxiliary equipment installed inside the reactor building that houses the reactor pressure vessel,
A guide rail which is arranged so as to extend substantially horizontally inside the operation floor opening and has a float for receiving buoyancy by water in contact with the bottom surface;
A trolley that moves along the guide rail;
A cable processing device attached to the trolley and capable of winding and delivering a cable extending downward from the operation floor opening;
A reactor building work auxiliary device characterized by comprising: When the reactor is shut down, the upper part of the reactor pressure vessel is opened and the reactor pressure vessel is filled with water, and the working device is suspended from the upper surface of the water into the reactor pressure vessel. In the reactor building working method for operating the working device above the
A circular opening inside the operation floor opening provided above the reactor pressure vessel on the operation floor and having an upper surface substantially the same height as the upper surface of the operation floor and having the same size as the inner diameter of the reactor pressure vessel And a platform having a platform opening composed of a fuel changer mast passage opening communicating with the circular opening, and a platform support structure for supporting the platform,
Suspending the working device in the reactor pressure vessel from above the platform and operating the working device;
Reactor building working method characterized by When the reactor is shut down, the upper part of the reactor pressure vessel is opened and the reactor pressure vessel is filled with water, and the working device is suspended from the upper surface of the water into the reactor pressure vessel. In the reactor building working method for operating the working device above the
Inside the operation floor opening is formed a platform opening comprising a circular opening of approximately the same size as the inner diameter of the reactor pressure vessel and an opening for passing through a fuel changer mast communicating with the circular opening. A weir is provided along the platform opening to form a platform configured to receive buoyancy from water in contact with the bottom surface;
Suspending the working device in the reactor pressure vessel from above the platform and operating the working device;
Reactor building working method characterized by When the reactor is shut down, the upper part of the reactor pressure vessel is opened and the reactor pressure vessel is filled with water, and the working device is suspended from the upper surface of the water into the reactor pressure vessel. In the reactor building working method for operating the working device above the
A platform configured to receive buoyancy by water in contact with the bottom surface is disposed inside the operation floor opening,
Place a jumper between the platform and the operation floor,
Suspending the working device in the reactor pressure vessel from above the platform and operating the working device;
Reactor building working method characterized by When the reactor is shut down, the upper part of the reactor pressure vessel is opened and the reactor pressure vessel is filled with water, and the working device is suspended from the upper surface of the water into the reactor pressure vessel. In the reactor building working method for operating the working device above the
Arranged inside the opening of the operation floor is a cable processing device equipped with a cable processing unit configured to receive buoyancy by water in contact with the bottom surface and capable of winding and delivering the cable,
A positioning mast of variable length is arranged to communicate between the cable processing device and the operation floor;
Suspending the working device from the cable processing device into the reactor pressure vessel and operating the working device;
Reactor building working method characterized by When the reactor is shut down, the upper part of the reactor pressure vessel is opened and the reactor pressure vessel is filled with water, and the working device is suspended from the upper surface of the water into the reactor pressure vessel. In the reactor building working method for operating the working device above the
A guide rail extending substantially horizontally with a float for receiving buoyancy by water in contact with the bottom surface is disposed inside the operation floor opening,
Move the trolley along the guide rail,
Winding and delivering a cable extending downward from the trolley through the operation floor opening;
Reactor building working method characterized by

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