JP2003172793A - Method of temporarily placing reactor container head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the required laydown area of a PCV head on a reactor building operation floor and reduce the volume of a reactor building. <P>SOLUTION: This method of temporarily placing the PCV head 2 comprising fixing the PCV head 2 to a rotary table 11, rotatable up and down, placed on the reactor building operation floor 1 in the reactor building 29 and then rotating the rotary table 11 for putting the PCV head 2 in vertical attitude so that the PCV head 2 is supported by the rotary table 11. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying down a reactor containment head removed from a reactor containment head on a floor surface of a reactor building in a nuclear power generation facility and temporarily placing it, and is required for temporary placement. Technology for reducing the flat area.

[0002]

2. Description of the Related Art In a nuclear power generation facility, maintenance / inspection work (hereinafter referred to as “inspection”), which is carried out regularly every year in order to confirm that there is no functional problem with equipment, etc., is performed inside the reactor building. Although it will be carried out, the primary temporary placement situation of disassembled equipment at the time of inspection on the operating floor (also called refueling floor) in the conventional reactor building, that is, the laydown situation is as follows. There is. It should be noted that the temporary placement of the equipment on the operating floor in the reactor building itself is disclosed in JP-A-63-
It is known from Japanese Patent No. 250593.

Large-scale equipment such as a reactor pressure vessel is arranged in the reactor building. These devices are checked every year,
On the operating floor of the reactor building, an overhead crane installed above the reactor building is used to disassemble and assemble the equipment.

Generally, an operation floor is provided on the upper floor of the reactor building, and a reactor well corresponding to the upper space of the reactor is provided at the center of the operation floor. A spent fuel pool and a temporary equipment pool are provided on both sides of the reactor well on this operating floor.

Therefore, in order to determine the layout and dimensions of the reactor building, a necessary installation space for the equipment installed in the building is secured, and large equipment in the reactor building on the operation floor of the reactor building is secured. It is necessary to consider both aspects of securing a space for laying down disassembled products.

[0006] In addition, a floor opening (hereinafter referred to as a large-sized goods inlet) is provided on the operating floor of the reactor building for carrying in and out inspection materials and road tools, and for carrying in and out replacement parts. There is. Japanese Unexamined Patent Publication No. 11-23770 discloses that the refueling floor surface is provided with a large carry-in port called a hatch.

The operating floors around the reactor well, the spent fuel pool, the equipment temporary storage pool, the large-size carry-in port, etc. are used when the reactor is opened for refueling work of the reactor during inspection. It is used as a space for laying down equipment (temporary storage).

Regarding the reactor pressure vessel head of the reactor pressure vessel, at the time of inspecting the equipment inside the reactor pressure vessel and replacing the fuel, it is removed from the reactor pressure vessel, hung by an overhead crane and lowered to the operating floor. Is laid down. As a hanging tool used for the laydown,
It is disclosed in Japanese Utility Model Application Laid-Open No. 64-33697 and JP-A-4-130297.

[0009]

In recent years, in nuclear power plant facilities including a reactor building, downsizing of the building has become indispensable mainly from the viewpoint of improving economical efficiency. Regarding the dimensions, the floor area required for the laydown of the equipment and the like on the operating surface of the reactor building is a constraint.

To check the equipment in the reactor pressure vessel,
Remove the reactor containment head, which is fixed to the reactor containment vessel above the reactor containment vessel, from the reactor containment vessel, and then open the lid on top of the reactor pressure vessel. The device can be taken out and inspected. At the time of inspection, the reactor containment head is removed from the reactor containment vessel and temporarily placed on the operating floor of the reactor building.

[0011] The conventional laydown method for disassembling a large-scale decomposed product such as a reactor containment head onto the operating floor of the reactor building has the following problems. That is, the conventional reactor building has a dimension that secures the necessary laydown area of the large-scale decomposed product on the operating floor of the reactor building, which is one of the factors that determine the dimensions of the reactor building. Therefore, if the reactor building is downsized, it will not be possible to secure the necessary laydown area for large decomposed products on the operating floor of the reactor building.Therefore, secure the required laydown area for large decomposed products on the operating floor of the reactor building. Is an obstacle to building downsizing.

On the other hand, since the laydown of large decomposed products in the reactor building is temporarily carried out at the time of periodic inspection of the nuclear power plant, the size of the reactor building can be reduced by the space required for this temporary laydown. From the viewpoint that it is uneconomical to make a decision, a more compact laydown method has been desired.

The present invention has responded to that desire, and when laying down a large decomposed product on the operating floor of the reactor building, it is possible to reduce the required laydown area on the operating floor of the reactor building. The purpose is to provide a laydown method on the driving floor.

[0014]

The above object of the present invention is to:
It can be achieved as follows. (1) In the method of laying down the reactor containment head (hereinafter simply referred to as the PCV head) among the large-sized decomposed products laid down in the reactor building, the PCV head is laid down vertically or diagonally. (2) In the above (1), the PCV head is laid down vertically or diagonally on at least a pedestal having a horizontal movement means. (3) The PC installed in the reactor building in (1) above
Hook the PCV head on the hook for hanging the V head and lay down the PCV head vertically or diagonally. (4) In (1) above, a jack is provided on the pedestal that moves horizontally in the reactor building, and the jack supports the part of the PCV head and pushes it upward to lay down the PCV head diagonally. thing. (5) A pit capable of accommodating the PCV head should be installed inside the reactor building, and the laydown (1)-(4) above shall be carried out in the pit. (6) Perform the laydown of (1)-(4) above with the PCV head in the temporary equipment pool inside the reactor building. (7) In the above (1)-(6), a reinforcing material for preventing deformation of the PCV head is installed on the PCV head so that the PCV head is not deformed during temporary placement.

By laying down the PCV head vertically or diagonally in the reactor building, the vertical projection area of the reactor building for placing the PCV head is reduced, and the reactor building is laid down. It is possible to reduce the required laydown area on the indoor floor.

Further, when the PCV head is laid down in the reactor building, the PCV head is laid down vertically or diagonally in a pit or a temporary equipment pool to reduce the required laydown area in the reactor building operation. It becomes possible to do.

Further, when the PCV head is laid down in the reactor building, the PCV head is laid down while being supported diagonally by using a jack, so that the PCV head is laid down in the reactor building in the vertical direction. The projected area is reduced and the required laydown area in the reactor building can be reduced.

Since the required laydown area can be reduced, the reactor building can be downsized and the economy can be improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention is as follows. That is, the nuclear power generation facility is equipped with the reactor building 29. Inside the reactor building, the containment vessel 8
The reactor pressure vessel 4 is housed in the reactor containment vessel 8. In the reactor building 29, a space called a reactor well 5 is opened above the reactor pressure vessel 4, and the floor in the reactor building where the reactor well 5 is opened is the reactor building operation floor surface 1. To be equipped. The PCV head 2 partitions the inside of the reactor containment vessel 8 from the reactor well 5 in an airtight manner except at the time of refueling or handling inspection of equipment and nuclear fuel in the reactor pressure vessel 4. In order to establish the section, the PCV head main flange of the PCV head 2 arranged so as to cover the upper part of the reactor pressure vessel 4 in the receiver of the PCV head 2 protruding from the reactor containment vessel 8 to the inside of the reactor well 5. 7 are piled up, and the PCV head main flange 7 and the upper end flange of the above-mentioned cylindrical structure are fastened by bolts to the PCV in the reactor containment vessel 8.
The V head 2 is fixed.

The opening above the reactor well is covered with a reactor well cover 6 when the nuclear power plant is operating. The reactor well cover 6 can remove the PCV head 2 from the reactor pressure vessel 4 and inspect the equipment inside the reactor pressure vessel 4, and can put in and take out nuclear fuel from / into the core of the reactor pressure vessel.

On the operating floor 1 of the reactor building, as shown in FIG. 10, the temporary equipment pool 21 and the reactor well 5 are installed.
A spent fuel storage pool 25 is provided on the opposite side of the equipment temporary storage pool 21 with the device in between. In the upper space of the operation floor 1 of the reactor building, an overhead crane 3 is installed in the reactor building so as to pass above the temporary equipment storage pool 21, the reactor well 5, and the spent fuel storage pool 25. ing.

On the traverse trolley of this overhead crane 3,
A suspender called a head strong back 9 is movably suspended in the vertical direction. Head strong back 9
Has a portion that can be engaged with the PCV head 2. The PCV head 2 is provided with a PCV head main flange 7 for mounting the PCV head 2 to the reactor containment vessel 8 side. The PCV head 2 is attached to the reactor containment vessel 8 by fastening the PCV head main flange 7 to the reactor containment vessel 8 with bolts during operation of the nuclear power generation facility. The PCV head main flange 7 is provided with a bolt through hole for fastening the PCV head main flange 7 to the reactor containment vessel 8 with a bolt.

On the operating floor 1 of the reactor building inside the reactor building, the PCV head 2 removed from the reactor containment vessel 8
A rotary pedestal 10 is provided for supporting the above on the operating floor 1 of the reactor building. As shown in FIG. 3, the rotary pedestal 10 includes a trolley 26 that can travel on the operating floor 1 of the reactor building with wheels 13, and two columns 27 fixed to the trolley 26.
The column 27 is provided with a turntable 11 rotatably attached in a vertical direction by a rotation shaft, and a stopper 28 fixed to the carriage 26 so as to project upward so as to restrain the turntable 11 in a vertical posture. .

The turntable 11 has a ring shape. The size of the ring is the PCV head main flange 7
Is the size to ride. The ring is provided with bolt through holes at the same arrangement pitch as the bolt through holes provided in the PCV head main flange 7.

When the PCV head 2 is laid down on the operating floor 1 of the reactor building, the reactor well cover 6 is removed from above the reactor well 5 to open the reactor well 5 above. Next, the bolts passed through the PCV head main flange 7 are removed to separate the PCV head 2 from the reactor containment vessel 8. PCV head 2 and head strong back 9
And the PCV head 2 is lifted together with the head strong back 9 from the overhead crane 3. The PCV head 2 thus lifted is moved above the rotary pedestal 10 as the traverse trolley of the overhead crane 3 traverses, and the PCV head 2 is lowered to the PCV head 2 as shown in FIG.
The head main flange 7 is applied to the horizontal turntable 11. Next, the PCV head main flange 7 and the rotary base 11 are bolted through the through holes of the bolts, and the two are joined by bolts.

Next, while loosening the wire that suspends the head strong back 9 from the overhead crane 3, the turntable 1
1 is rotated in the vertical direction about the rotation shaft 12 as shown by the arrow in FIG. 4, and the lower portion of the turntable 11 is stopped by the stopper 28.
And stop its rotation. Next, the head strong back 9 is removed from the PCV head 2. After that, by rotating the wheels 13 so as to open the periphery of the reactor well 5, the carriage 26 is pushed together with the PCV head 2 toward the wall side of the reactor building and temporarily placed, and the laydown of other equipment and the like is performed. Be sure not to disturb the inspection work.

When temporarily placed in this manner, the PCV head 2
Is placed in a vertical position by the wall and does not interfere with the work around the reactor well 5. Further, since the PCV head 2 is placed vertically, the required floor area occupation degree for placing the PCV head 2 is small as compared with the case where the PCV head 2 is placed horizontally. Therefore, the reactor building will be compact. The vertical posture of the PCV head 2 means a posture in which the PCV head main flange 7 is substantially vertical (90 degrees) with respect to the reactor building operation floor surface 1, that is, an angle with respect to a substantially horizontal line. To tell. In addition, a PCV head 2 described later
The slanted posture is a posture in which the PCV head main flange 7 has an inclination of 30 degrees or more with respect to the reactor building operation floor surface 1, that is, a substantially horizontal line.
In this case, when interpreting vertical or inclination of 30 degrees or more,
It is regarded as horizontal, ignoring the slopes of the reactor building operation floor 1, the equipment temporary storage pool 21 described later, and the bottom of the pit 20.

As described above, the PCV head 2 and the ring-shaped rotary base 11 can be fixed by the bolts so that the PCV head 2 can be vertically supported by the rotary receiving base 10, and the PCV head 2 can be vertically supported. In this case, the ring-shaped rotary base 11 can prevent the deformation of the PCV head 2 due to its own weight due to the change of the posture by performing the function of the reinforcing member.

PCV head 2 according to the second embodiment of the present invention
The laydown method is shown in FIGS. Second
The embodiment is a modification of the first embodiment described above. The changes are as follows. That is, instead of the rotary receiving base 10 of the first embodiment, as shown in FIG. 5, a gantry 14 and a hook 16 are adopted.

The pedestal 14 is configured to receive the PCV head 2 in a horizontal state and has a configuration in which the central portion is opened in the vertical direction, and is supported from above the operating floor 1 of the reactor building by a plurality of columns. Reactor building 29 adjacent to the gantry 14
The hook 16 is attached to the inner side wall 31 by a rotating shaft 30 so as to be vertically rotatable. The hook 16 is provided at its tip with a bolt 32 that can be inserted into a bolt through hole provided in the PCV head main flange 7.

Further, the reinforcing device 15 shown in FIG. 6 is prepared. The reinforcing device 15 has a structure in which an extension / contraction mechanism is provided at the tip of a radially extending frame 33. The expansion / contraction mechanism uses the expansion / contraction action of the hydraulic cylinder 34 to provide the tip member 35 of the reinforcing device.
Is pressed against the inner surface of the PCV head 2. The tip member 35 is fitted on the frame 33 so as to be slidable only in the longitudinal direction. The tip material 35 that contacts the inner surface of the PCV head 2 is covered with an elastic material such as rubber to prevent slippage and prevent damage to the inner surface of the PCV head 2. Other configurations are the same as those of the above-described first embodiment.

In order to lay down the PCV head 2 in the second embodiment, first, in the same manner as in the first embodiment, the PCV head 2 is suspended and moved above the reactor building operation floor surface 1 by the overhead crane 3. After that, as shown in FIG. 5, the PCV head 2 is horizontally hung on the pedestal 14 that has been waiting at the moving destination. Next, as shown in FIG. 6, the reinforcing device 15 is placed inside the PCV head 2 and the tip member 35 is pressed against the inner surface of the PCV head 2 by the extension action of the hydraulic cylinder 34 to stretch it, so that the reinforcing device 15 does not fall off. To do so.

Next, the PCV head 2 is again lifted by the overhead crane 3 and separated from the pedestal 14 upward. In this state, the reinforcing device 15 mounted inside the PCV head 2 is also hung up together. Next, the PCV head 2 is moved by the overhead crane 3 so that one of the bolt through holes provided in the PCV head main flange 7 is located right above the bolt 32 of the hook 16.

Next, the overhead crane 3 lowers the PCV head 2 and inserts the bolt 32 into the through hole of the bolt provided in the main flange 7 of the PCV head. Next, a nut prepared separately is screwed onto the tip of the bolt 32 that has passed through the through hole of the bolt provided in the PCV head main flange 7 to connect the hook 16 to the PCV head main flange 7. Finish.

After that, when the PCV head 2 is lowered by the overhead crane 3, the PCV head 2 moves in the direction of the arrow in FIG.
Rotates, and at the same time, the hook 16 also rotates in the same direction about the rotation shaft 30 as the center of rotation, and finally the PCV head 2 becomes a vertical posture. Next, the head strong back 9 is removed from the PCV head 2 and the PCV head 2 is temporarily placed on the side wall 31 in the reactor building 31 in a vertical posture.

In such a temporarily placed state, the hook 16 supports the PCV head 2, so that the PCV head 2 can be prevented from falling. When it is impossible to support the entire load of the PCV head 2 with the hook 16 in consideration of the side wall strength, the lower end of the PCV head 2 in a vertical posture is supported on the operating floor 1 of the reactor building. You may do it. Also, by supporting the lower end side of the PCV head 2 on the operating floor 1 of the reactor building,
The head 2 may be tilted to support the upper end side of the PCV head 2 with the hook 16.

In this way, the PCV head 2 can be temporarily placed in a vertical or diagonal posture, and the required laydown area can be reduced.
It is possible to downsize the reactor building. Further, the reinforcement device 15 restrains the PCV head 2 from being deformed due to its own weight due to the change of the posture in that case.

The third embodiment is shown in FIGS. In this third embodiment, a moving jack 17 and a pedestal 19 are used instead of the rotary pedestal 10 of the first embodiment. The moving jack 17 is configured by attaching a jack 42 whose operation direction is oriented in the vertical direction to a dolly 41 movably arranged on the floor surface 1 of the reactor building by wheels 40.

The upper end of the jack 42 is provided with an engaging structure for the PCV head 2 which rotates in the vertical direction on the rotating shaft. The engagement structure is such that the rotary shaft 4 is attached to the upper end of the jack 42.
3 includes an arm 44 rotatably attached in the vertical direction, and a pin 45 attached to the tip of the arm 44 and inserted into a through hole of a bolt provided on the PCV head main flange 7. Other configurations are first
Same as the embodiment.

The PCV head 2 removed from the reactor containment vessel 8 was lifted from the overhead crane 3 using the head strong back 9, and the PCV head main flange was placed on the truck 41 that had been standing by on the operating floor 1 of the reactor building. Move so that 7 is located. Next, the pin 45 is inserted into the through hole of the bolt provided on the PCV head main flange 7 to move the PCV head 2 together with the carriage 41 to the side wall 31 side.

After that, the left end of the PCV head main flange 7 is lowered onto the pedestal 19 fixed to the reactor building operation floor 1 by the hoisting action of the overhead crane 3. Next, jack 4
2 is extended upward, and the right end of the PCV head 2 is pushed upward. At that time, the carriage 41 is moved to the left side so that the jack 42 is always vertical. Jack 42
The change in the tilt angle of the PCV head 2 with respect to
This is allowed when the arm 44 rotates in the vertical direction around the point 3.

The PCV head main flange 7 at the left end of the PCV head 2 which is in contact with the pedestal is in contact with a groove formed on the upper surface of the pedestal 19 so as not to slip to the left.
It is also possible to attach an upward projection to the pedestal and prevent the PCV head main flange 7 from slipping by the projection.

In this way, when the PCV head 2 is in the temporarily placed oblique posture, the movements of the jack 42 and the truck 41 are stopped, and the truck 41 is actuated not only to stop the vehicle but also to brake the rotation of the wheels 40. . PC in this way
Temporarily place the V head 2 in an oblique posture. In this embodiment, the PCV head main flange 7 is maintained at an angle of about 45 degrees with respect to the reactor building operation floor surface 1 and the PCV head 2 is maintained.
Is temporarily placed.

In this way, the PCV head 2 can be laid down diagonally, the required laydown area can be reduced, and the reactor building can be downsized. Also in this embodiment, when it is desired to avoid the deformation of the PCV head due to its own weight, the reinforcement device 15 is provided with the PCV head as in the second embodiment.
It is good to attach it to the head.

In the fourth embodiment, as shown in FIG. 10, the above-mentioned first embodiment or second embodiment is carried out in the temporary equipment storage pool 21. First in the temporary equipment pool 21
When carrying out the embodiment, the rotary pedestal 10 shown in FIG. 3 is placed on the bottom of the temporary equipment pool 21, and the PCV head 2 is carried by the overhead crane on the rotary platform 11 of the rotary pedestal 10.
Is fixed, and further, the rotary table 11 is rotated to change the posture to a vertical posture, and in this posture, the cart 26 and the device temporary storage pool 21 are held.
Place it temporarily on the side wall of. In the equipment temporary storage pool 21, the PCV head 2 has a vertical posture and the equipment temporary storage pool 2
Since it is brought close to the side wall of No. 1, a space for temporarily placing the dryer 22 and the separator 23 in the temporary equipment pool 21 is secured. In this way, the point that the rotary pedestal 10 is placed in the equipment temporary storage pool 21 is different from that of the first embodiment, and the other implementation contents and configurations are the same as those of the first embodiment.

In this way, the PC is placed in the equipment temporary storage pool 21.
Since the V head 2 can be laid down vertically, the required laydown area is reduced. Furthermore, the equipment temporary storage pool 21 located at a position lower than the reactor building operation floor 1
By laying down the PCV head 2 on the bottom of the
Even if the head 2 is installed vertically, it is possible to reduce the required height above the operating floor 1 of the reactor building, and it is possible to reduce the height of the reactor building along with the reduction of the required laydown flat area. Become.

When the second embodiment is carried out in the temporary equipment storage pool 21, the hook 16 of FIG. 5 is attached to the side wall of the temporary equipment storage pool 21. The PCV head 2 is hooked on the hook 16 in the same manner as in the second embodiment, and the PCV head 2 is temporarily placed in the equipment temporary placement pool 21 in a vertical posture.
Since the PCV head 2 can be temporarily placed in the device temporary placement pool 21 in the vertical posture on the side wall of the pool, the space for temporarily placing the dryer 22 and the separator 23 in the device temporary placement pool 21 is secured in this case as well.

In this case also, the PC is placed in the temporary equipment pool 21.
Since the V head 2 can be laid down vertically, the required laydown area is reduced. In addition, PC
By vertically laying down the V head 2 in the equipment temporary storage pool 21 at a position lower than the reactor building operation floor surface 1, it becomes possible to reduce the required height above the reactor building operation floor surface 1, and the required laydown Along with the reduction of the flat area, it is possible to reduce the height of the reactor building.

In the fifth embodiment, as shown in FIGS. 10 and 11, a pit 20 capable of vertically storing the PCV head 2 is provided on the operating floor 1 of the reactor building so as to be dug down.
At the bottom of the pit 20, the above-described rotary pedestal 1 shown in FIG.
0 is placed as shown in FIG. Using the rotation receiving base 10, the PCV head 2 is laid down vertically as in the first embodiment.

As described above, since the PCV head 2 can be vertically laid down in the pit 20 provided on the operating floor 1 of the reactor building, the required laydown area can be reduced and the reactor building can be reduced. The required height above the operation floor surface 1 can be reduced, and the height of the reactor building can be reduced together with the reduction of the required laydown area.

Although the laydown method using the rotary pedestal 10 has been described in this embodiment, the hook 16 of FIG. 5 is installed on the side wall of the pit 20 so that the second embodiment described above can be used in the pit 20. It is possible to reduce the height of the reactor building along with the reduction of the required laydown area.

In any of the embodiments, the
When the V head 2 is assembled into the reactor containment vessel 8 and then returned to its original state, the procedure is the reverse of the procedure of temporarily placing the PCV head.

[0053]

As described above, according to the present invention, by laying down the PCV head vertically or obliquely, the flat area of the required laydown space in the reactor building can be reduced, or the building can be reduced. It is possible to improve economic efficiency.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view in the vicinity of a reactor operation floor of a reactor building.

FIG. 2 is a vertical cross-sectional view in the vicinity of the reactor operation floor of the reactor building showing the PCV head laydown work according to the first embodiment of the present invention.

FIG. 3 is a perspective view of the rotary pedestal of FIG.

FIG. 4 is a vertical cross-sectional view of the vicinity of the reactor operation floor of the reactor building after the PCV head is laid down according to the first embodiment of the present invention.

FIG. 5 (a) is a vertical cross-sectional view of the vicinity of the reactor operation floor of the reactor building showing the PCV head laydown work according to the second embodiment of the present invention, and FIG. Figure A
FIG.

6A is a perspective view showing the inside of the PCV head shown in FIG. 5, and FIG. 6B is an enlarged cross-sectional view showing a portion B in FIG. 6A.

FIG. 7 is a vertical cross-sectional view in the vicinity of the reactor operation floor of the reactor building showing the PCV head laydown work according to the second embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view in the vicinity of the reactor operation floor of the reactor building showing the PCV head laydown work according to the third embodiment of the present invention.

9A is a vertical cross-sectional view of the vicinity of a reactor operation floor of a reactor building after laydown of a PCV head according to a third embodiment of the present invention, and FIG. 9B is a PCV of FIG. It is an expanded sectional view of an engaging portion of a head and a jack.

FIG. 10 is a plan view of the reactor operating floor showing a situation after the laydown of the PCV head according to the fourth embodiment of the present invention.

FIG. 11 is a vertical cross-sectional view in the vicinity of the reactor operation floor of the reactor building showing a PCV head laydown operation according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 ... Reactor building operation floor surface, 2 ... PCV head, 3 ... Overhead crane, 4 ... Reactor pressure vessel, 5 ... Reactor well, 6
… Reactor well cover, 7… PCV head main flange,
8 ... Reactor containment vessel, 9 ... Head strong back, 1
0 ... Rotating cradle, 11 ... Rotating base, 12 ... Rotating shaft, 13 ... Wheels, 14 ... Frame, 15 ... Reinforcing device, 16 ... Hook, 17
… Jack, 19… Pedestal, 20… Pit, 21… Equipment temporary storage pool.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahide Watari             3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Stock Association             Hitachi, Ltd. Nuclear Business Division (72) Inventor Shizuka Hirako             Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki             Engineering Co., Ltd. (72) Inventor Yoshinori Iimura             Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki             Engineering Co., Ltd. (72) Inventor Tomohiko Kikuyama             Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki             Engineering Co., Ltd.

Claims (11)

[Claims] 1. A reactor containment vessel, wherein a reactor pressure vessel head removed from a reactor containment vessel is placed in a reactor building with a main reactor containment vessel head main flange inclined vertically or obliquely to a horizontal line. Head temporary placement method. 2. The reactor according to claim 1, wherein the reactor containment head is placed in the reactor building with the main reactor containment head main flange at an angle of 30 to 90 degrees with respect to the horizontal line. Temporary placement method for containment vessel head. 3. A rotary pedestal having a rotary base that can rotate up and down is placed on the operating floor of the reactor building, the reactor containment head is fixed to the rotary base, and then the rotary base. Is rotated so that the main flange of the reactor containment head is in a vertical orientation, and the reactor containment head is temporarily placed so as to support the reactor containment head in that orientation. 4. The reactor containment head main flange according to claim 1, wherein the reactor containment head is engaged with a hook rotatably attached to the reactor building in a vertical direction, and then the hook is rotated to form a main flange of the reactor containment head. A method for temporarily placing a reactor containment head in which the reactor containment head is supported by the hook by rotating the reactor containment head in the same direction as the rotation direction until it becomes vertical. 5. A pedestal placed in a reactor building and a jack provided on the pedestal according to claim 1, wherein a part of the head of the reactor containment vessel is lifted by the jack to contain the reactor. A method for temporarily placing a reactor containment head for supporting the reactor containment head such that a main flange of the container head is inclined. 6. The method for temporarily placing a reactor containment head according to claim 1, wherein the reactor containment head is supported in a pit inside the reactor building. 7. The temporary storage method for a reactor containment head according to claim 1, wherein the reactor containment head is supported in an equipment temporary storage pool inside a reactor building. . 8. The reactor containment vessel according to claim 1, wherein a means for suppressing deformation of the reactor containment head is provided inside the reactor containment head. A method for temporarily placing a reactor containment head in which the head is supported so that the main flange of the reactor containment head is vertical or slanted. 9. A method of temporarily placing a reactor containment head removed from a reactor containment vessel in a reactor building, wherein a rotary cradle having a rotatable base that can be rotated up and down is used as a reactor building operation floor or equipment. Place it in a temporary storage pool or in a pit formed on the operating floor, fix the reactor containment head on its turntable, and then rotate the turntable to move the reactor containment head main flange to the horizontal line. A method for temporarily placing a reactor containment head in which the reactor containment head is supported in a vertical state by the rotation receiving table and the supporting position is maintained by means for restraining the rotation of the rotation table. 10. A method of temporarily placing the reactor containment head removed from the reactor containment vessel in the reactor building, wherein the hook of the reactor containment head is attached to a hook rotatably mounted vertically in the reactor building. Fasten the main flange of the reactor containment vessel, and then rotate the hook to rotate the reactor containment head in the same direction as the rotation direction so that the reactor containment head main flange is perpendicular to the horizontal line. The method for temporarily placing a reactor containment head in which the hook is used to support the reactor containment head. 11. A method of temporarily placing a reactor containment head detached from a reactor containment vessel in a reactor building, in which a pedestal fixed to an operation floor of the reactor building and a trolley provided with a braking means are vertically moved. A jack equipped to the reactor, a part of the reactor containment head is placed on the pedestal so as not to slip, and a part of the reactor containment head opposite to the part is retained by the jack in the reactor. After raising a part of the PCV head and further moving the carriage so that the jack is perpendicular to the horizontal line, the main flange of the reactor PCV head becomes oblique at an angle of 30 degrees or more with respect to the horizontal line. In addition, a method for temporarily placing a reactor containment head in which the movement of the carriage is stopped by a braking device of the carriage to support the reactor containment head in the oblique state.