JP2000162360A - Main steam escape safety valve and carry-in/out facility therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce equipment inspection operation time due to the use of a fork-lift carry-in/out facility, reduce the height of a reactor storage container, and reduce the volume of the reactor storage container by installing a trunnion in a valve being arranged around the reactor storage container. SOLUTION: A trunnion 2 is installed at the center of a main steam escape safety valve 1 or near the center of gravity, an automatic traveling type main steam escape safety carry-in/out facility 8 is used, and a recessed part for receiving the trunnion 2 and a tool for fixing a main steam escape safety valve carry- in/out facility are installed at a fork part 10 of the automatic traveling type main steam escape safety valve carry-in/out facility 8. Equipment inspection operation time can be reduced, the height of the reactor storage container and a reactor building can be reduced, and the volume of the reactor storage container and the reactor building can be reduced, thus easily carrying in or out a valve while facing sideways.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main steam release safety valve carrying-in / out facility disposed in a main steam pipe in a containment vessel of a boiling water nuclear power plant.

[0002]

2. Description of the Related Art FIG. 8 shows a plan view of a main steam release safety valve (hereinafter referred to as SRV) carrying-in / out facility in a latest boiling water type light water reactor generally employed in the prior art. As shown in FIG. 8, the SRV loading / unloading equipment includes a monorail 3 for SRV loading / unloading, and a lifting machine 4 moving along the monorail 3.
And a device carrying-in / out path 6 and a device carrying-in / out hatch 7.

At a nuclear power plant, maintenance and maintenance are periodically conducted every year in order to confirm that there is no functional problem with equipment and the like.
Inspection work (hereinafter referred to as inspection) is performed. The SRV 1 is also removed from the main steam pipe 15 at the time of this inspection, carried out of the containment vessel, and inspected.

The SRV 1 is continuously installed above the main steam pipe in the containment vessel. At the time of inspection, the SRV 1 is removed from the main steam pipe by the crane 4 installed above the SRV 1 and placed on the loop in FIG. It is transported along the monorail 3, lowered in the equipment loading / unloading path 6, transported out of the reactor containment vessel from the equipment loading / unloading hatch 7 by the transport trolley, and inspected.

[0005] When carrying in, reverse to the above procedure, SRV1
After being carried into the equipment carrying-in / out path 6 from the equipment carrying-in / out hatch 7, it is lifted by the lifting machine 4, transported by moving along the monorail 3, and lowered at a predetermined position of the main steam pipe. Will be installed.

Next, the lifting operation and the overturning operation of the SRV 1 will be described. FIG. 9 shows a cross-sectional view of a situation in which the SRV 1 is turned over. The SRV 1 is arranged side by side on the main steam pipe 15, and is first lifted upward by the crane 4 above the SRV 1. Here, a wire is wound around the lower part of the SRV1, and this wire is installed diagonally above the crane 4
To pull down the SRV by pulling in the direction of arrow 112.

When performing the overturning operation, the lifting machine 4 is gradually moved and balanced as the SRV 1 is overturned, so that it takes time for the operation. SRV1 is lying down
Is suspended by the lifting machine 4 as shown in FIG.
, Is lowered in the equipment loading / unloading path 6, and is carried out of the reactor containment vessel from the equipment loading / unloading hatch 7 by the transport trolley.

At the time of loading, contrary to the above procedure, the wire 5 is transported by moving along the monorail 3 and the wire 5 is attached to the lower part of the SRV 1 at a predetermined position. The wire 5 is installed and gradually changes its direction to a vertical direction. The wire 5 is lowered to the main steam pipe and installed in the vertical direction.

FIG. 11 shows a vertical section of a reactor building of a conventional latest boiling water light water reactor. The containment vessel 16 is installed in a reactor building 17. Within the containment vessel 16 is the reactor pressure vessel 14. Here, the monorail 3 for carrying in and out the SRV is installed at the uppermost part in the reactor containment vessel 16, and the installation height of the monorail 3 is set to the installation height of the SRV1 installed in the main steam pipe. Is determined by adding space for transporting the other SRV1 over the mountains. The installation height of the monorail 3 is one factor that determines the height of the containment vessel 2.

Further, when the height of the containment vessel 16 is determined, the height of the reactor building 17 is determined. That is, the installation height of the monorail 3 is an important dimension that determines the height of the containment vessel 16.

Japanese Patent Application Laid-Open No. 9-222490 discloses a method for changing the method of carrying in and out the main steam release safety valve to reduce the height of the reactor containment vessel. Equipment ”. Here, the feature is that the arrangement of the monorail for carrying in / out the valve in the containment vessel is changed. This technique does not describe a disassembly method that does not use a monorail.

[0012]

As described above, as described above,
In order to reduce the time required for the SRV to fall down, it is necessary to easily rotate the SRV.

Further, since the height of the containment vessel is determined by the height of the monorail for transporting the SRV, in order to reduce the height of the containment vessel, the height of the rail for transporting the SRV must be reduced. It is necessary to lower the height or not to use rails for carrying in / out SRV.

The object of the present invention has been made in view of the above, and it is possible to easily carry out or carry in an SRV.
Provide a main steam release safety valve and a main steam release safety valve loading / unloading facility that can sufficiently reduce the height of the reactor containment vessel and the reactor building and reduce the volume of the reactor containment vessel and the reactor building. To be.

[0015]

The above object can be achieved as follows.

(1). In the main steam release safety valve located in the main steam pipe inside the reactor containment vessel of the boiling water nuclear power plant, a trunnion is installed at the center of the main steam release safety valve or near the center of gravity, and the valve is easily placed in a horizontal position. That it is possible to carry in and out.

(2). (1) In the equipment for lifting and self-propelling a main steam release safety valve of (1), a main body, a driving device installed in a central portion of the main body, wheels installed in a lower portion of the main body, and a fork installed in a front portion of the main body. And a space inside the main body to accommodate the main steam release safety valve.

(3). (2) In the main steam release safety valve carrying-in / out facility of (2), the fork has a recess for receiving a trunnion.

(4). (2) The main steam release safety valve carrying-in / out facility of (2) has a fixing jig for fixing the main body and the floor.

(5). (1) Instead of a main steam release safety valve in which a trunnion is permanently installed, a trunnion should be installed with a removable band.

That is, by installing a trunnion near the center of the valve or near the center of gravity in the SRV, when the SRV is turned over to carry it out of the containment vessel,
By rotating around a trunnion installed at the center of the valve or near the center of gravity, it is possible to easily turn over the trunnion, thereby shortening the inspection period and reducing the exposure of workers by improving the inspection work efficiency.

Also, in the SRV loading / unloading equipment, a main body, a driving device installed at a central portion of the main body, wheels installed at a lower portion of the main body, and a fork installed at a front portion of the main body,
By using equipment equipped with a space for accommodating the main steam release safety valve inside the main body and carrying the SRV out of the containment vessel, it is not necessary to install a monorail, and the reactor containment vessel and reactor building The height can be reduced, and the volumes of the containment vessel and the reactor building can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

FIG. 1 is an example of a side view of the SRV and the disassembly monorail. A trunnion 2 is installed at the center of gravity of the SRV1. A disassembled monorail 3 and a lifting machine 4 are installed above the SRV 1.

The trunnion 2 is mounted on the SRV 1 by welding the trunnion 2 to the body of the SRV 1. Alternatively, a method of installing a screw hole in the body of the SRV1 and attaching the SRV1 to the screw hole may be considered. In addition, a method of wrapping a band on which a trunnion is installed around the SRV 1 is conceivable.

In the present invention, the monorail 3 and the hoist 4 installed above the SRV 1
A method for unloading 1 will be described. At the beginning,
The hoist 4 is moved to the upper part of the SRV 1, where the wire 5 suspended by the hoist 4 is hung on the trunnion 2 of the SRV 1, and the SRV 1 is pulled up in this state. FIG.
1 is a view of the SRV and the disassembly monorail viewed from the side, and is an example of a view seen from a direction different from that of FIG. 1 by 90 degrees. This S
Since the RV 1 is lifted by the trunnion 2 installed at the position of the center of gravity, the RV 1 can be easily rotated in the direction of the arrow 111.

Here, the SRV 1 suspended upward by the lifting machine 4 is rotated by the operator about the trunnion 2 in the direction of the arrow 111, and the SRV 1 is turned over. The SRV 1 that has been laid down in the above procedure is fixed and moved along the monorail 3 by the crane 4 by hanging wires on both ends of the SRV 1, and is lowered into the equipment loading / unloading path 6, and the equipment is unloaded. It is carried out of the containment vessel through the input hatch 7.

The carry-in procedure is the reverse procedure of the carry-out procedure described above. First, it is carried into the reactor containment vessel from the equipment loading / unloading hatch 7 and moves to the equipment loading / unloading path 6. Here, SRV1
The trunnion 2 is hung upward by the hoisting machine 4, the wires are hung on both ends of the SRV 1, fixed, and moved to the installation position of the SRV 1 by the monorail 3. Therefore, wires 5 installed at both ends of SRV1
Remove SR, rotate SRV1 around trunnion 2 and
RV1 is in a vertical state. SRV1 in the vertical state
Is lowered vertically and installed in the main steam pipe.

As described above, since the direction can be easily changed around the trunnion 2, the working time can be reduced.

Next, the SRV1 is mounted on the main body, a driving device installed in the center of the main body, a wheel installed on the lower part of the main body, a fork installed on the front part of the main body, and an SRV for storing the SRV inside the main body. A method of carrying out by using equipment (hereinafter referred to as SRV carrying-in and out forklift) 8 having a space will be described. 3 and 4 are cross-sectional views of the SRV and the SRV carry-in / out forklift. First, the SRV carry-in / out forklift 8 is moved to the vicinity of the SRV1 installation position. Here, the grating floor 13 is installed up to the vicinity of the SRV1.

Next, the fork 10 of the forklift 8 for carrying in / out the SRV is lowered, and the fork 10 is moved to a position below the trunnion 2 installed in the SRV 1, where the SR
The main body of the V carry-in / out forklift 8 is fixed to the grating floor with a wire or the like. By fixing the grating floor to the rear of the SRV carry-in / forklift 8,
Fork 10 in front of SRV carry-in / out forklift 8
Can be prevented from falling even if a large load is applied.

After fixing the floor with the forklift 8 for carrying in and out the SRV, the fork 10 is slightly lifted upward. Next, SR
An operator rotates V1 about the trunnion 2. In this rotation work, the trunnion is installed at the position of the center of gravity of the SRV1, so that the worker can easily fall down.
The SRV1 is fixed to the fork 10 with a wire in order to fix the SRV1 in a sideways state. Next, the fork 10 is moved in the direction of the main body 12, and the SRV1 is stored. The movement of the fork 10 is controlled by a pinion 18 connected to a driving device.
Is rotated, and the rack 19 connected to the pinion 18 moves horizontally.

In this state, the wire and the like that fixed the forklift 8 for carrying in and out of the SRV are removed from the floor, and the SRV is removed.
The forklift 8 for loading and unloading runs on its own
1 is carried out of the containment vessel through the hatch 7.

The carrying-in procedure is the reverse procedure of the carrying-out procedure. First, the SRV is loaded into the reactor containment vessel by the SRV loading / unloading forklift 8 from the equipment loading / unloading hatch 7 and
1 Move to the installation position. Here, SR
The rear part of the V carry-in / out forklift 8 is fixed to the floor. Next, the fork 10 is moved forward to the installation position of the SRV1, the wire fixing the SRV1 in the sideways position is removed, and the worker rotates the SRV1 so that the SRV1 is in a vertical state. Lower it in the direction below and install it on the main steam pipe.

FIG. 5 shows a concave groove provided on the fork 10. By installing a concave groove in the fork 10 as shown in this figure, it becomes easy to fix the SRV 1 on the top of the fork 10 when the SRV 1 is transported by the forklift 8 for carrying in and out of the SRV, and the rotation operation of the SRV 1 Safety and workability at the time can be improved.

FIG. 6 is a cross-sectional view of the jig 9 for fixing the main steam release safety valve carrying-in / out equipment, showing the state before fixing. Jig 9 for fixing the main steam release safety valve carrying-in / out equipment
Is installed at the rear of the SRV carry-in / forklift 8. FIG. 7 is a cross-sectional view of the jig 9 for fixing the main steam release safety valve carrying-in / out facility as viewed from the side at 90 ° from FIG. 6 and shows a state before fixing.

FIG. 8 is a cross-sectional view of the jig 9 for fixing the main steam release safety valve carrying-in / out equipment, showing a state after fixing to the steel frame. As shown in FIG. 8, the jig 9 for fixing the main steam release safety valve carrying-in / out facility is first rotated in the direction of arrow 114. Here, the portion of the grating floor 13 that interferes with the rotation of the main steam release safety valve carrying-in / out facility fixing jig 9 is set as a detachable grating floor 14, and the main steam releasing safety valve carrying-in / out facility fixing jig is provided. When rotating 9, the detachable grating floor 14 is removed.

FIG. 9 is a cross-sectional view of the jig 9 for fixing the main steam release safety valve carrying-in / out facility as viewed from the side at 90 ° in FIG. 8, and shows a state after fixing. Arrow 11 as described above
The main steam release safety valve carrying-in / out facility fixing jig 9 rotated in the direction of 4 moves in the direction of arrow 115 in FIG. 9 so that the flange of the steel frame installed under the floor as shown in FIG. By sandwiching, the SRV carry-in / out forklift 8 can be easily fixed.

FIG. 10 is an example of a sectional view when a trunnion is installed on the SRV1 with a detachable band.
In this drawing, the band and the trunnion have an integral structure. Here, it is necessary to strongly wrap the band 15 with the trunnion around the SRV1 body so that the band 15 with the trunnion does not come off from the SRV1.

FIG. 11 is an example of a sectional view when a trunnion is installed on the SRV1 with a detachable band.
In the example shown in the figure, pins are installed on the SRV1 main body in order to prevent the band 15 with the trunnion from slipping. This pin can be installed by welding to the SRV1 main body or by installing a screw hole in the SRV1 main body and attaching the pin to the screw hole.

FIG. 12 is an example of a sectional view of the SRV1. In the example shown in this figure, a trunnion-equipped band installation groove 17 is provided in the SRV1 main body in order to prevent the trunnion-equipped band 15 from slipping. By installing the band 15 with a trunnion in this groove, it is possible to prevent the band 15 with a trunnion from slipping.

[0042]

As described above, according to the present invention, the SRV
In the above, by installing a trunnion at the center of the valve or near the center of gravity, the SRV is rotated around the trunnion installed at the center of the valve or near the center of gravity when the SRV is turned over to carry it out of the containment vessel. As a result, it is possible to easily lay down, shortening the inspection period by improving the efficiency of inspection work, and reducing the exposure of workers.

Further, in the SRV loading / unloading equipment, a main body, a driving device installed at a central portion of the main body, wheels installed at a lower portion of the main body, and a fork installed at a front portion of the main body.
By using equipment equipped with a space for accommodating the main steam release safety valve inside the main body and carrying the SRV out of the containment vessel, it is not necessary to install a monorail, and the reactor containment vessel and reactor building The height can be reduced, and the volumes of the containment vessel and the reactor building can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an SRV, a monorail for carrying in and out, and a hoist according to the present invention.

FIG. 2 is a sectional view showing an example of an SRV, a monorail for carrying in and out, and a hoist according to the present invention.

FIG. 3 is a cross-sectional view showing an example of the SRV of the present invention and a forklift for carrying in and out.

FIG. 4 is a cross-sectional view showing an example of the SRV of the present invention and a forklift for carrying in and out.

FIG. 5 is a perspective view showing a groove of a fork of the SRV carrying forklift of the present invention.

FIG. 6 is a sectional view showing a state before a jig for fixing a main steam release safety valve carrying-in / out facility of the present invention is fixed.

FIG. 7 is a cross-sectional view showing a state before a jig for fixing a main steam release safety valve carrying-in / out facility of the present invention is fixed.

FIG. 8 is a sectional view showing a state after the jig for fixing the main steam release safety valve carrying-in / out facility of the present invention is fixed.

FIG. 9 is a sectional view showing a state after the jig for fixing the main steam release safety valve carrying-in / out facility of the present invention is fixed.

FIG. 10 is a sectional view showing an example of a state in which the band with trunnion of the present invention is installed on a main steam release safety valve.

FIG. 11 is a sectional view showing an example of a state in which the band with trunnion of the present invention is installed on a main steam release safety valve.

FIG. 12 is a sectional view showing an example of the main steam release safety valve of the present invention.

FIG. 13 is a plan view of a conventional SRV loading / unloading facility.

FIG. 14 is a sectional view showing a conventional SRV loading / unloading procedure.

FIG. 15 is a sectional view showing a conventional SRV carrying-in / out procedure.

FIG. 16 is a sectional view of a conventional reactor building.

[Explanation of symbols]

1 ... Main steam release safety valve, 2 ... Trunnion, 3 ... Monorail, 4 ... Lifting machine, 5 ... Wire, 6 ... Equipment loading / unloading path,
7: hatch for loading / unloading equipment, 8: loading / unloading equipment for the main steam release safety valve, 9 ... jig for fixing the loading / unloading equipment for the main steam release safety valve,
10 ... fork, 11 ... steel frame, 12 ... groove, 13 ... grating floor, 14 ... detachable grating floor, 15 ...
Band with trunnion, 16 band stopper with trunnion, 17 groove for trunnion band installation, 18 pinion, 19 rack, 20 reactor pressure vessel, 21
Main steam piping, 22 ... Reactor containment vessel, 23 ... Reactor building.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kikuo Takeshima 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Inside the Hitachi Works, Hitachi, Ltd. (72) Nobuaki Oshima 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 Inside Hitachi, Ltd. Hitachi Plant (72) Inventor Yoshinori Tobita 3-2-1 Sachimachi, Hitachi City, Ibaraki Prefecture Inside Hitachi Engineering Co., Ltd.

Claims (5)

[Claims] In a main steam release safety valve disposed in a main steam pipe in a reactor containment vessel of a boiling water nuclear power plant, a trunnion is installed at the center or near the center of gravity of the main steam release safety valve, and the valve is turned sideways. The main steam release safety valve, which makes it easy to carry in and out in different postures. 2. The equipment according to claim 1, wherein the main steam release safety valve is lifted and self-propelled and transported, wherein the main body, a driving device installed at a central portion of the main body, a wheel installed at a lower portion of the main body, and Main steam release safety valve carrying-in / out equipment, characterized by comprising a fork installed and a space inside the main body to accommodate the main steam release safety valve. 3. The main steam release safety valve carrying-in / out facility according to claim 2, wherein the fork has a recess for receiving a trunnion. 4. The main steam release safety valve carrying-in / out facility according to claim 2, further comprising a fixing jig for fixing the main body and the floor at a rear portion of the self-propelled main steam release safety valve carrying-in / out facility. . 5. A main steam release safety valve according to claim 1, wherein the trunnion is replaced with a permanent steam release safety valve, and the trunnion is installed with a removable band.