JP2002181980A - Water pressure control unit and installation method thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To eliminate the need to interrupt the construction work of a building for carrying in a water pressure control unit of a nuclear reactor, and to eliminate a cause of delay in a construction process. A nitrogen gas container for storing high-pressure nitrogen gas,
An accumulator 2 for storing high-pressure water, a scram valve 3 that opens instantaneously upon emergency insertion of a control rod of a control rod drive mechanism to release high-pressure water in the accumulator, and piping 4 for connecting these components are provided as unit members. The unit members are connected to the vertical wall 9a and the floor 9 of the water pressure control unit room 9 of the reactor building.
The wall hardware 20 and the floor hardware 21 for mounting and fixing to the b respectively are configured as an integral support hardware 17. The support hardware 17 unit members are assembled integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pressure control unit constituting a control rod driving water pressure system of a boiling water reactor, a method of installing the water pressure control unit in a water pressure control unit room of a reactor building, and a water pressure control system. The present invention relates to a boiling water nuclear power plant in which a control unit is installed.

[0002]

2. Description of the Related Art Referring to FIGS. 7 to 12, a conventional water pressure control unit (hereinafter referred to as "HCU") and an HCU
The technique for installation in a water pressure control unit room (hereinafter, referred to as “HCU room”) will be described.

FIG. 7 shows a configuration in which a conventional HCU is installed in an HCU room. As shown in FIG.
Reference numeral 10 denotes a main unit member, a nitrogen gas container 1 for storing high-pressure nitrogen gas, and an accumulator 2 for storing high-pressure water.
And a scram valve 3 that opens instantaneously during the scram of the control rod drive mechanism (CRD) to release high-pressure water in the accumulator 2
And nitrogen gas container 1, accumulator 2, scrum valve 3
And various pipes 4 for respectively connecting CRD drive hydraulic system pipes and the like (not shown).

The nitrogen gas container 1 is provided with a vertical wall 9a of the HCU chamber 9.
2a, a horizontally long plate-like upper wall metal piece 8a fixed to the surface
It is mounted and supported via the upper seismic support 7a of the book. That is, the lug 1a of the nitrogen gas container 1 is supported by the upper seismic support 7a and is fastened and fixed by a plurality of bolts. A lower wall hardware 8b is fixed to a lower portion of the vertical wall 9a, and the lower wall hardware 8b is also provided with two lower seismic supports 7b. In the lower seismic support 7b, the lower part of the nitrogen gas container 1 is restrained by three inner arc-shaped plates (not shown), whereby the lower part of the nitrogen gas container 1 is prevented from swaying.

On the other hand, the accumulator 2, the scrum valve 3, the various pipes 4 and the like are assembled integrally with a vertical frame-shaped frame 5 connected to the ends of the upper seismic support 7a and the lower seismic support 7b. 9b. That is, the lower end of the frame 5 is placed at a predetermined position on the floor metal 21 installed on the surface of the floor 9b, and the rectangular seats 6 provided at the lower end of the frame 5 are each provided with two bolts 16 Is fixed to the floor hardware 21. The upper and lower seismic supports 7 for the vertical walls 9a
The tips of a and 7b and the frame 5 are fixed to each other by bolts.

A pipe 11 provided at a lower end of the nitrogen gas container 1 and a pipe 12 provided at a lower part of the accumulator 2 are connected via flanges 13 and 14 and fastened and fixed by bolts. In the above-described HCU installation state, the scrum valve 3 is connected to a CRD drive hydraulic system piping (not shown) by welding.

High-pressure nitrogen gas is sealed in the nitrogen gas container 1, and high-pressure water is supplied from the CRD driving hydraulic system piping to the accumulator 2 through a filling water piping 4 a connected to the upper part of the accumulator 2. A piston is incorporated in the accumulator 2, and the piston separates high-pressure water at the upper part of the accumulator 2 and high-pressure nitrogen gas at the lower part.

Next, the function and operation of the HCU 10 will be described.

The HCU 10 inserts (scrams) control rods in the reactor into the core at a high speed when the reactor is to be shut down in an emergency. It has the function of supplying high-pressure water.

At the time of scram, the solenoid valve 3a provided above the scram valve 3 of the HCU 10 is opened by turning off the power, and the air pressure closing the scram valve 3 is released from the solenoid valve 3a. The scram valve 3 is opened instantaneously by the restoring force of the compressed spring incorporated in the scram valve. Then, the high-pressure gas in the nitrogen gas container 1 pushes up the piston of the accumulator 2 through the pipe 11 at the lower end of the nitrogen gas container 1 and the pipe 12 connected to the lower part of the accumulator 2, and the high-pressure water in the accumulator 2 is discharged by the scram valve 3. Is discharged from High pressure water is HCU10
The CRD flows into the CRD through the internal pipe 4 and a CRD drive hydraulic system pipe (not shown), and pushes up the piston of the CRD. Thus, the control rod connected to the upper end of the piston of the CRD is inserted into the core at a high speed.

FIG. 8 is a plan view showing an example of the arrangement of the HCU 10 having the above-described configuration, in which an HCU room 9 provided in a reactor building of an improved boiling water reactor (ABWR) is taken as an example.

As shown in FIG. 8, the HCU room 9 has a rectangular shape in a plan view, and is provided, for example, on the second basement floor of a reactor building, and is a reactor pressure vessel (not shown) installed at the center of the reactor building. Two chambers are provided symmetrically with respect to.

In the HCU room 9, HCUs 10 are arranged along the four vertical walls 9a, and each HCU 10 is installed so as to face the center of the room. In the example of the ABWR, 103 HCUs 10 are installed and two HCUs 10 are installed.
52 units and 51 units are arranged in the CU room 9, respectively.

Next, a conventional HC will be described with reference to FIGS.
The U10 installation method will be described.

FIGS. 9 and 10 show a support structure for fittings and the like for installing the HCU 10, FIG. 11 shows an installation state of the nitrogen gas container 1, and FIG. 12 shows a state in which other unit members are being installed. I have.

At the time of the construction of the reactor building,
Concrete will be poured in the order of walls and ceiling, and construction will proceed to the upper floor. In this case, as shown in FIG. 9 and FIG. 10, the upper wall metal member 8a and the lower wall metal member 8b in the form of a horizontally long plate for supporting the HCU 10 are placed on the vertical wall 9a of the HCU room 9 during concrete casting. It is provided in a separated arrangement. An upper seismic support 7a and a lower seismic support 7b protruding toward the HCU chamber 9 are provided on each of the wall hardware 8a and 8b, one pair each on the left and right sides.
In addition, a flat metal floor 21 is provided on the floor 9 b of the HCU chamber 9. The floor metal 21 is provided with a required number of screw holes (not shown) for inserting fixing bolts of the HCU 10. When the HCU 10 is installed, all of the floor, walls and ceiling of the HCU room 9 are cast,
After completion.

That is, after the HCU chamber 9 is completed, the nitrogen gas container 1 and other parts (assembled components such as the accumulator 2, the scram valve 3, the pipe 4, the frame 5, and the like) are connected to a major component (not shown) of the reactor building. It is carried in from the entrance,
After being vertically moved to the floor where the HCU room 9 is provided, it is further horizontally moved to the HCU room 9 and carried into the HCU room 9. Then, all the nitrogen gas containers 1 are first installed,
Next, assembled components such as the accumulator 2, the scrum valve 3, the pipe 4, and the frame 5 are installed.

When installing the nitrogen gas container 1, FIG.
As shown in FIG. 1, a nitrogen gas container 1 is vertically inserted between two left and right upper seismic supports 7a projecting from upper and lower wall hardwares 8a and 8b, and provided at an outer peripheral target portion of the nitrogen gas container 1. The lugs 1a are hooked on the upper seismic support 7a, and the lugs 1a and the upper seismic support 7a are fastened by bolts. In the lower seismic support 7b,
The nitrogen gas container 1 is fixed by bolts in a state where the periphery of the nitrogen gas container 1 is restrained by three divided arc-shaped plates (not shown), and the lower part of the nitrogen gas container 1 is stabilized.

Next, as shown in FIG. 12, the accumulator 2, the scrum valve 3, the pipe 4 and the like are integrally mounted on the frame 5 having the seat 6, and the vertical wall 9a is provided by the truck 18 with a chain block. Move on the floor towards
It is stopped at the position where the seat 6 of the frame 5 is arranged on the floor hardware 21 and suspended from the carriage 18. At this time, it is necessary to align the pipe 11 provided at the lower end of the nitrogen gas container 1 and the pipe 12 provided at the lower part of the accumulator 2 with high accuracy. The adjustment is performed by putting a shim under the lug 1a of the nitrogen gas container 1 or the like. Then, as shown in FIG.
The seats 6 at the lower end of the frame 5 are respectively fixed to the floor hardware 21 with bolts. Further, the frame 5 is fastened to the end portions of the vertical seismic supports 7a, 7b of the wall hardware 8a, 8b and the frame 5 by bolts 16. Further, the pipe 11 provided at the lower end of the nitrogen gas container 1 and the pipe 12 provided at the lower part of the accumulator 2 are connected by joining the flanges 13 and 14 at their ends and bolting the joint.

[0020]

However, according to the above-mentioned prior art, the HCU chamber 9 is not completed until the HCU chamber 9 is completed.
In the case of installing the U10, it is necessary to interrupt other work for carrying in the HCU10, and there is a problem that the construction process is delayed.

When the HCU 10 is installed locally,
There is a problem that a large work time is required due to a small work space, an inability to use a crane, and the like.

Further, when the nitrogen gas container 1 and the assembled components such as the accumulator 2, the scram valve 3, the pipe and the frame 5 are separately installed, the pipe connection between the lower end of the nitrogen gas container 1 and the lower part of the accumulator 2 is performed. Therefore, there is a problem that it is necessary to perform accurate alignment, and to perform this adjustment at the construction site requires a great deal of work and time.

The present invention has been made in view of such circumstances, and an HCU installation method that does not cause a delay in a construction process when installing in an HCU room, an HCU suitable for implementing the method, and An object is to provide a boiling water nuclear power plant in which the HCU is installed.

Further, an HCU installation method capable of shortening the installation work time as compared with the conventional one, and a pipe connection between the lower end of the nitrogen gas container and the lower part of the accumulator can be performed with high accuracy and in a short time, so that a great amount of positioning is required. H that doesn't take time
It is intended to provide a CU installation method.

[0025]

According to the first aspect of the present invention, there is provided a water pressure control unit constituting a control rod driving water pressure system of a boiling water reactor, comprising: a nitrogen gas container for storing high pressure nitrogen gas; An accumulator for storing the control rod, a scram valve that opens instantaneously at the time of emergency insertion of the control rod of the control rod drive mechanism and releases high-pressure water in the accumulator, and piping for connecting these as a unit member. The wall hardware and the floor metal for mounting and fixing the members to the vertical wall and the floor of the water pressure control unit room of the reactor building, respectively, are configured as integral support hardware, and the unit member is integrally assembled with the support hardware. A water pressure control unit is provided.

According to the second aspect of the present invention, the water pressure control unit according to the first aspect is assembled in a factory beforehand, and then transported to a construction site of a nuclear power plant, where the ceiling is placed in a water pressure control unit room of a reactor building. A method for installing a water pressure control unit is provided, wherein the method is carried in before installation and installation is performed.

According to a third aspect of the present invention, in the second aspect of the invention, in the method of installing a hydraulic pressure control unit according to the second aspect, one or a plurality of hydraulic pressure control units are integrally assembled.
Provided is a method of installing a hydraulic control unit, which comprises carrying and installing the hydraulic control unit.

According to a fourth aspect of the present invention, in the method of installing a hydraulic pressure control unit according to the third aspect, the number of the hydraulic pressure control units to be assembled integrally is reduced to one entire surface of the vertical wall constituting the hydraulic pressure control unit chamber and to the entire two surfaces. And a method of installing a hydraulic pressure control unit, characterized in that the number of units corresponds to either the entirety of the three surfaces or the entirety of the four surfaces.

According to the fifth aspect of the present invention, the second to fourth aspects are described.
In the method for installing a water pressure control unit according to any one of the above, the unit member to be integrated with the support metal in advance is a nitrogen gas container, and other unit members are assembled as a separate step, and the nitrogen gas container is subjected to water pressure control. A method of installing a water pressure control unit, comprising: assembling the other unit member into the nitrogen gas container after the installation in a chamber.

[0030] In the invention according to claim 6, claims 2 to 5 are provided.
The water pressure control unit installation method according to any one of the above, wherein the wall metal part of the support metal is used as a vertical concrete placing frame of the water pressure control unit room.

In the invention according to claim 7, in addition to the water pressure control unit according to claim 1, the packing and the installation in the water pressure control unit room from the factory to the construction site of the power plant, and also the reinforcement and curing after that are performed. A water pressure control unit characterized in that a structure is provided integrally with a support fitting.

[0032] According to the invention of claim 8, in claims 2 to 6
A method for installing a water pressure control unit according to any one of the above, wherein the water pressure control unit according to claim 7 is used in place of the water pressure control unit according to claim 1. I do.

According to a ninth aspect of the present invention, there is provided a boiling water nuclear power plant in which the water pressure control unit according to the first aspect is installed in a water pressure control unit room of a reactor building.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6 are the same as or correspond to the unit members of the HCU described as a conventional example.
The description is given with the same reference numerals as in FIG.

First Embodiment (FIGS. 1 to 4) FIG. 1 is a configuration diagram showing a state in which an HCU according to a first embodiment of the present invention is installed in a reactor building of a boiling water nuclear power plant. 2 (A) to 2 (D) are process diagrams showing a procedure for assembling the HCU in a factory, and FIG. 3 is a configuration diagram showing the HCU after the assembly is completed. FIG. 4 shows the HCU shown in FIG.
It is an enlarged view of the lower end part in the installation state of.

As shown in FIG. 1, the HCU 1 of this embodiment
The main unit members are a nitrogen gas container 1 for storing high-pressure nitrogen gas, an accumulator 2 for storing high-pressure water, and a control rod drive mechanism (CR).
D) A scram valve 3 that opens instantaneously during the scram to release high-pressure water in the accumulator 2, and various pipes 4 that respectively connect the nitrogen gas container 1, the accumulator 2, the scrum valve 3, and a CRD driving hydraulic system pipe (not shown). And

In the present embodiment, these unit members are integrally assembled on the support hardware 17 in which the wall hardware 20 and the floor hardware 21 are integrated. That is, the wall hardware 20 is configured as a single rectangular plate that is vertically long, and rises from the vicinity of the lower end of the vertical wall 9a of the HCU chamber 9 to substantially the same height as the top in the installed state of the nitrogen gas container 1. ing. Horizontal rectangular floor hardware 2 at the lower end of wall hardware 20
1 are integrally connected by welding, and the lower end of the wall hardware 20 and the lower surface of the floor hardware 21 are connected to a horizontal base frame 22.
Is fixed by welding or the like.

The base frame 22 is made of, for example, H-shaped steel or the like which is arranged in parallel at both ends along the width direction (the thickness direction of the sheet of FIG. 1) of the floor metal fitting 21.
Is fixed by welding or the like to a buried metal 23 composed of a horizontal plate with pillars buried in the concrete of the floor 9b.

The wall hardware 20 is disposed on the concrete surface (HCU installation surface) of the vertical wall 9a.
The wall hardware 20 is firmly fixed to the vertical wall 9a by embedding a large number of dowels 20a protruding from the surface on the side opposite to the HCU chamber 9 in the concrete of the vertical wall 9a. Two upper seismic supports 7a and two lower seismic supports 7b, each of which are the same as in the prior art, are protrudingly provided on the surface side of the one-piece wall hardware 20 so as to be vertically separated from each other.

The upper and lower portions of the nitrogen gas container 1 are mounted and supported via these seismic supports 7a and 7b. That is, the lug 1a of the nitrogen gas container 1 is supported by the upper seismic support 7a and is fastened and fixed by a plurality of bolts. In the lower seismic support 7b, the lower portion of the nitrogen gas container 1 is restrained by three not-shown inner arc-shaped plates, and the lower portion of the nitrogen gas container 1 is prevented from swaying.

On the other hand, the accumulator 2 and the scrum valve 3
The various pipes 4 and the like are integrally assembled and supported by a vertical frame-shaped frame 5 connected to the ends of the upper seismic support 7a and the lower seismic support 7b. That is, the lower end of the frame 5 is placed at a predetermined position on the floor hardware 21,
The rectangular seat 6 provided at the lower end of the frame 5 is fixed to the floor metal 21 with two bolts 16 respectively. The frame 5 is fixed to the top ends of the upper and lower seismic supports 7a and 7b with bolts.

A pipe 11 provided at a lower end of the nitrogen gas container 1 and a pipe 12 provided at a lower part of the accumulator 2 are connected via flanges 13 and 14 and fastened and fixed by bolts. In the above-described HCU 10 installation state, two pipes 4 connected to the scrum valve 3 are connected to a CR (not shown).
It is connected to the D drive hydraulic system piping by welding.

Then, high-pressure nitrogen gas is sealed in the nitrogen gas container 1, and high-pressure water is supplied into the accumulator 2 from the CRD driving hydraulic system piping through the filling water piping 4 a connected to the upper part of the accumulator 2. You. A piston is incorporated in the accumulator 2, and the piston separates high-pressure water at the upper part of the accumulator 2 and high-pressure nitrogen gas at the lower part. The functions and operations of the HCU 10 are the same as those of the conventional example, and thus the description thereof will be omitted. Also, HCU1
The number and arrangement of zeros are the same as in the conventional example shown in FIG.

Next, a procedure for assembling and installing the HCU 10 will be described with reference to FIGS. In the present embodiment, assembling of the support hardware 17 in which the wall hardware 20 and the floor hardware 21 are integrated with a unit member is shown in FIG.
As shown in (D), the H
The CU 10 is transported to the reactor building and installed.

That is, as shown in FIG. 2A, the wall hardware 20 is arranged, for example, horizontally, and the lower surface of the
And the upper and lower seismic supports 7
a and 7b are attached, and a floor metal 21 is vertically joined to one end (right end in FIG. 2A), which is a lower end when the wall metal 20 is installed, to form a support metal 17. At the time of installation, the base frame 22 is joined to the bottom side surface (the right side surface in FIG. 2A).

Next, as shown in FIG. 2 (B), the nitrogen gas container 1 is placed sideways and supported and fixed to the upper and lower seismic supports 7a and 7b. In this case, the nitrogen gas container 1 is
0 at the top of the upper seismic support 7a,
The two lugs 1a provided in the nitrogen gas container 1 are mounted so as to be supported by the lugs 1a and the upper seismic support 7a.
The nitrogen gas container 1 is restrained using three arc-shaped plates (not shown) in the lower seismic support 7b, and is fixed by bolts.

On the other hand, the other unit members such as the accumulator 2, the scrum valve 3, and the pipes 4 and 4a are previously assembled integrally with the frame 5, and as shown in FIG. 1 and the pipe 11 of the nitrogen gas container 1 and the pipe 12 of the accumulator 2 are accurately aligned and connected by joining the flanges 13 and 14. In this case, a shim may be inserted into the lower surface when the seat 6 of the frame 5 is installed, or the lug 1 of the nitrogen gas container 1 may be inserted.
Position adjustment is performed by, for example, inserting a shim into the lower surface at the time of installation of a. Thereafter, the seat 6 of the frame 5 and the floor metal 21 are fixed by bolts. In addition, the front end portions of the upper and lower seismic supports 7a and 7b of the wall hardware 20 and the frame 5 are fastened by bolts.

Then, after the assembly of each unit member to the supporting hardware 17 is completed, as shown in FIG. 2D, a package 24 for covering the upper and side surfaces of these unit members is provided. The package 24 includes a reinforcing frame 25 made of, for example, a mold steel and a cover plate 26 such as a thin iron plate. Reinforcement frame 2
5 has an L-shape, for example, as viewed from the side, and its tip is attached to the wall hardware 20 and the base frame 22 by bolts (not shown). The covering plate 26 is provided with the reinforcing frame 25.
And is laid so as to cover the space, and is attached by, for example, bolts. As a result, HCU1
The entire outer surface side of the unit member No. 0 is tightly covered with the hard package 24. Thus, the HCU 10 in which the wall hardware 20, the floor hardware 21, and the unit members are assembled integrally and the packaging 24 is provided is transported to the power plant construction site.

FIG. 3 shows the HCU 10 provided with the package 24 shown in FIG. 2D as a vertical arrangement in an installation posture, and FIG. 4 shows an enlarged state showing the HCU 10 installed on the vertical wall 9a of the HCU room 9. FIG.

As shown in FIGS. 4 and 5, a square plate 23 is provided on the floor 9b of the HCU room 9 at the power plant construction site.
a, a plurality of ingots 23 to which a plurality of dowels 23b are welded are laid. Further, a wall back 30 is installed on the vertical wall 9a side. In this state, the wall hardware 20 and the floor hardware 2
The HCU 10 in which the unit members are assembled on the supporting hardware 17 integrally comprising
Put on. After adjusting the positions of the wall hardware 20, the floor hardware 21 and the unit members, the base frame 22 below the floor hardware 21 is fixed to the embedded metal body 23 by welding. Then, concrete is cast on the back side using the wall hardware 20 as a part of the formwork, thereby forming the vertical wall 9a. Thereafter, a ceiling wall (not shown) is constructed, but after the installation, the package 24 is in a mounted state during the period of forming the ceiling wall and the like, so that the package 24 functions as a reinforcing material at the time of installation and thereafter, and a fall during the work is performed. It also functions as a curing material for preventing collision with objects. And HC including air conditioning equipment etc.
After the construction of the U room 9 is completed, the package 24 is removed, and the usage state shown in FIG. 1 is set.

According to this embodiment, H is set before the ceiling of the HCU room 9 of the reactor building is formed at the time of the construction of the nuclear power plant.
In order to install the CU10, that is, mount the blue sky,
There is no need to interrupt other work when loading the CU10,
Therefore, the HCU installation work does not cause a delay in the construction process. In the factory, the wall hardware 20 and the floor hardware 2 are used.
1 and the unit members are integrally assembled, so that a sufficient work space can be secured unlike the construction site, and the equipment necessary for work such as a crane is enriched, and the wall hardware 20, floor hardware 21, unit members, etc. Can be assembled in a horizontal state, so that work can be performed easily and efficiently. Further, the installation accuracy of the upper and lower seismic supports 7a and 7b to which the nitrogen gas container 1 is attached can be increased. Therefore, according to the present embodiment, the working time can be greatly reduced, and the accurate positioning required for connecting the lower end of the nitrogen gas container 1 to the lower part of the accumulator 2 can be easily performed. Does not require much time.

Further, the wall hardware 20, floor hardware 21 and HC
Assemble the unit members of U10 together and pack 2
By providing a structure that combines packing from the factory to the power plant, mounting in the blue sky, and subsequent reinforcement and curing, the safety of transportation and installation can be ensured. By using the wall hardware 20 also as a concrete casting mold, it is possible to reduce the amount of a wood mold used for ordinary concrete casting. That is, the reinforcing frame 25 and the cover plate 26 are used as a packing material when transported from the factory to the site, and the HCU being transported is used.
10 protections. Also, it becomes a reinforcing material at the time of loading / unloading on a truck or the like or loading the HCU 10 on a blue sky at the site, and also at the time of placing concrete after the blue sky is loaded. Also, after the blue sky is installed, there is no ceiling and HCU
Although it is a poor environment with no air conditioning equipment in the room 9, for example, by sending air that has passed through a cleaner (not shown) into the space formed by the reinforcing frame 25 and the cover plate 26, the HCU 1
It can be used as a curing material for protecting 0.

As described above, the wall hardware 20, the floor hardware 21, and the HCU 10 are integrally assembled, and furthermore, the packaging 24 from the factory to the power plant, and the reinforcement and curing after mounting on the blue sky are adopted. According to the installation method of the present embodiment, the HCU 10 can be cured from the factory shipment to the completion of the air conditioning equipment of the HCU room 9 after the on-site installation. It is possible to realize eco-friendly products, such as saving money, for example, without wasting wood.

In this embodiment, the most desirable HCU
As an example, the unit configuration including the package 24 has been described. However, in some cases, the form of the package 24 can be changed or omitted.

Second Embodiment (FIGS. 5 and 6) FIG. 5 is a front view showing a configuration of an HCU 10 according to a second embodiment of the present invention, and FIG. 6 is a plan view of FIG.

In the present embodiment, similarly to the first embodiment, the unit member of the HCU 10 is integrally assembled with the support hardware 17 in which the wall hardware 20 and the floor hardware 21 are integrated. Is different from the first embodiment in that a plurality of unit members such as the nitrogen gas container 1 are integrally assembled on a single support member 17 and installed. The procedure for installing the HCU 10 is the same as in the first embodiment.

In this embodiment, the wall hardware 20 and the floor hardware 21 are used.
The area of the supporting hardware 17 integrating the HCU 10
The unit member of the HCU 10 is installed on this. Although not shown, packaging corresponding to that is performed. Then, transport it to the construction site and install it with the blue sky.

According to the present embodiment, before the ceiling of the HCU room 9 of the reactor building is formed during the construction of the nuclear power plant,
Since the U10 is mounted in the blue sky, other operations do not need to be interrupted when the HCU 10 is carried in, there is no delay in the construction process, and the same effect as in the first embodiment is exerted. However, since a plurality of HCUs 10 can be installed at the same time, the efficiency of operations such as production, transportation, and installation can be further improved. In other words, by integrating a plurality of HCUs 10 with the wall fitting 21, compared to the case of one HCU 10, the assembled size can be set to a size that can be mounted on a trailer. This improves the efficiency in manufacturing the HCU room 9.

Other Embodiments In addition to the above-described first and second embodiments, the supplementary invention includes:
Various modifications and applications are possible. Hereinafter, those embodiments will be specifically described as the following (first example) to (fifth example). In addition, about the following code | symbol, FIGS. 1-6 are referred.

(First Example) In this example, it is assumed that the number of HCUs 10 to be integrally assembled corresponds to one entire surface of the vertical wall 9a constituting the HCU chamber 9. That is, the wall hardware 20
Further, the size of the floor hardware 21 is set to a size corresponding to the total number of unit members installed on one surface of the HCU chamber 9, and the HCU 10 for one surface is collectively installed on the support hardware 17 in which these are integrated.

The production and installation of the HCU 10 are as follows.
It can be performed by the same method as in the first embodiment and the second embodiment. That is, the assembly of the unit member and the package 24 and the like is performed in a factory with the corresponding size set, and then transported to the construction site and installed by mounting on a blue sky.

According to this example, since the HCU 10 for the entire surface of the HCU room 9 is integrated, the on-site work is greatly reduced, and the efficiency in mounting the blue sky and manufacturing the HCU room 9 on the site can be further improved. . In the same manner, the HCU room 9
Of the vertical wall 9a for two or three surfaces.

(Second Example) In this example, the number of HCUs 10 to be integrally assembled corresponds to the entire four surfaces of the vertical wall 9a constituting the HCU chamber 9. That is, the wall hardware 20
And the size of the support hardware 17 having the floor hardware 21 is H
The supporting hardware 17 has a size corresponding to the total number of unit members installed on the four surfaces of the CU room 9, and one surface of the HCU 1
0 are collectively installed.

The production and installation of the HCU 10 are as follows.
It can be performed by the same method as the above (first example). That is, the assembly of the unit member and the package 24 and the like is performed in a factory with the corresponding size set, and then transported to the construction site and installed by mounting on a blue sky.

According to this example, since the HCUs 10 for the entire four surfaces of the HCU chamber 9 are integrated, the on-site work only needs to be performed once.
Efficiency can be further improved in mounting the blue sky and manufacturing the HCU room 9 on site.

(Third Example) In this example, only the nitrogen gas container 1 of the unit members is assembled integrally with the support hardware 17 including the wall hardware 20 and the floor hardware 21 shown in the first embodiment. That is, in assembling the nitrogen gas container 1, the packing 24 is provided after the steps shown in FIGS. Further, as another process, other unit members are assembled, and after the nitrogen gas container 1 is installed in the water pressure control chamber 9, the other unit members are assembled to the nitrogen gas container 1.

In this way, the nitrogen gas container 1 is assembled integrally with the supporting hardware 17, packaged 24, and then transported to the construction site. At the site, the base frame 22 below the floor metal 21 is fixed to the buried metal 23 by welding. Then, concrete is cast on the back side of the wall hardware 20, and the vertical wall 9
a is formed, and a ceiling wall is further constructed.

Next, the accumulator 2, the scrum valve 3, the pipe 4 and the like are mounted on the frame 5, and then placed in a predetermined position on the floor metal 21 using a cart or the like as in the prior art.
At this time, it is necessary to accurately align the pipe 11 provided at the lower end of the nitrogen gas container 1 with the pipe 12 provided at the lower part of the accumulator 2. The adjustment is performed by inserting a shim under the lug 1a of the gas container 1. Then, frame 5
Are fixed to the floor hardware 21 with bolts at the seats 6 at the lower ends of the legs. In addition, the front end portions of the upper and lower seismic supports 7a and 7b of the wall hardware 20 and the frame 5 are fastened by bolts. Further, a pipe 11 provided at a lower end of the nitrogen gas container 1 and a pipe 12 provided at a lower part of the accumulator 2 are flange-connected by bolts.

According to the present embodiment, the nitrogen gas container 1 is loaded in the blue sky before the ceiling of the HCU room 9 of the reactor building is formed at the time of the construction of the nuclear power plant. There is no need to interrupt, and the delay in the construction process is reduced accordingly.

Further, since the wall fitting 20, floor fitting 21 and nitrogen gas container 1 are integrally assembled at the factory, a sufficient working space can be secured. The installation work time of the nitrogen gas container 1 can be shortened because the installation accuracy of the upper and lower seismic supports 7 and 8 to be attached is good, and the connection between the piping 11 at the lower end of the nitrogen gas container 1 and the piping 12 at the lower part of the accumulator 2. Alignment with high accuracy for performing the adjustment is easier than in the past, thereby reducing the adjustment time.

Further, according to the present embodiment, the installation work time of the nitrogen gas container 1 can be shortened, and accurate positioning for connecting the lower end of the nitrogen gas container 1 and the pipe below the accumulator 2 can be easily performed. And less adjustment time. In this embodiment, one or a plurality of nitrogen gas containers 1 can be assembled into one support fitting 17.

(Fourth Example) In this example, the above (third example) is applied to the installation of a nitrogen gas container 1 for one vertical wall. That is, the size of the wall hardware 20 and the floor hardware 21 is set to HC.
One of the four vertical walls 9a of the U chamber 9 is provided, and a number of nitrogen gas containers 1 corresponding to one vertical wall are installed there. The nitrogen gas container 1 is installed in the same manner as in the third example.
That is, after assembling the wall hardware 20 and the floor metal 21 for one wall of the HCU room 9 and the nitrogen gas container 1 having the number of bodies corresponding to one wall, the packaging 24 is performed, transported to the site, and mounted on the blue sky. Installed by

According to the present embodiment, in addition to the same effect as the above (third example), by integrating the wall metal fitting 21 for one surface of the vertical wall 9a of the HCU chamber 9 and the nitrogen gas container 1, The on-site work is further reduced as compared with the case where several nitrogen gas containers 1 are integrated,
The efficiency can be further improved in the production of It should be noted that the present invention can be similarly implemented as two or three vertical walls 9a of the HCU room 9.

(Fifth Example) In this example, the sizes of the wall hardware 20 and the floor hardware 21 are changed to the four vertical walls 9a and the floor wall 9b of the HCU room 9.
, And all the nitrogen gas containers 1 accommodated in one HCU chamber 9 are installed therein. Nitrogen gas container 1
Is performed in the same manner as in the (third example) and (fourth example). That is, after assembling the wall hardware 20 and the floor hardware 21 for the four surfaces of the vertical wall 9a of the HCU chamber 9 and all the nitrogen gas containers 1 to be accommodated in one HCU chamber 9, the packaging 24 is performed, and the packaging 24 is performed. Transport and install with blue sky.

According to the present example, (third example) and (fourth example)
In addition to the effect of the example, by integrating the four wall metal fittings 21 of the HCU chamber 9 and the nitrogen gas container 1, the locality can be further improved as compared with the case where a plurality of nitrogen gas containers 1 are integrated. Work can be reduced, blue sky loading and HC
The production efficiency of the U chamber 9 can be further improved.

[0076]

As described above, according to the present invention, during the construction of a nuclear power plant, before the ceiling of the HCU room of the reactor building is formed, the wall hardware, the floor hardware and the HCU are mounted in a blue sky in an assembled state. This eliminates the need to interrupt other operations for carrying in the HCU, and does not cause a delay in the construction process. Also, by assembling the wall hardware, floor hardware, and HCU integrally at the factory, a sufficient working space can be ensured, and the working time can be significantly reduced with ample facilities. Further, a great effect can be obtained, for example, with respect to a pipe connection between the nitrogen gas container and the accumulator, for example, high-precision alignment can be performed without requiring a large amount of time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a state in which an HCU according to a first embodiment of the present invention is installed in a reactor building of a boiling water nuclear power plant.

FIGS. 2A to 2D are process diagrams showing an HCU assembling procedure in a factory according to the first embodiment of the present invention.

FIG. 3 shows H after assembly according to the first embodiment of the present invention.
The block diagram which shows CU.

4 is an enlarged view of a lower end portion of the HCU shown in FIG. 3 in an installed state.

FIG. 5 is a front view showing a configuration of an HCU 10 according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a configuration of an HCU 10 according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a configuration in which a conventional HCU is installed in an HCU room.

FIG. 8 is a plan view showing an example of the arrangement of the HCU.

FIG. 9 is a side view showing a support structure of a conventional HCU mounting bracket and the like.

FIG. 10 is a front view showing a support structure for a conventional HCU mounting bracket and the like.

FIG. 11 is a diagram showing an installed state of a nitrogen gas container in a conventional HCU.

FIG. 12 is a diagram showing a state in which another unit member is installed in the nitrogen gas container shown in FIG. 11;

[Explanation of symbols]

 Reference Signs List 1 nitrogen gas container 1a lug 2 accumulator 3 scrum valve 4 piping 5 frame 6 seat 7a upper seismic support 7b lower seismic support 8 wall hardware 9 HCU room (water pressure control unit room) 9a vertical wall 9b floor 10 HCU (water pressure control unit) 11 , 12 Piping 13, 14 Flange 16 Bolt 17 Support Hardware 20 Wall Hardware 20a Jibel 21 Floor Hardware 22 Base Frame 23 Filled Metal 24 Packing 25 Reinforcement Frame 26 Cover Plate 30 Wall Spine

Claims (9)

[Claims] 1. A water pressure control unit constituting a control rod driving water pressure system of a boiling water reactor, comprising: a nitrogen gas container for storing high pressure nitrogen gas; an accumulator for storing high pressure water;
A control rod drive mechanism comprising a scram valve which is instantaneously opened at the time of emergency insertion of a control rod drive mechanism to open high-pressure water in the accumulator, and a pipe connecting these components as a unit member, wherein the unit member is a reactor building. The water pressure control is characterized in that the wall hardware and the floor hardware for installation and fixing to the vertical wall and the floor of the water pressure control unit room are respectively formed as an integral support hardware, and the unit member is integrally assembled with the support hardware. unit. 2. The hydraulic pressure control unit according to claim 1 is assembled in a factory in advance, then transported to a construction site of a nuclear power plant, and carried into a water pressure control unit room of a nuclear reactor building before ceiling construction. A method for installing a water pressure control unit, which comprises performing installation. 3. The method according to claim 2, wherein one or a plurality of hydraulic control units are integrally assembled, transported, and installed. 4. A method of installing a hydraulic pressure control unit according to claim 3, wherein the number of the hydraulic pressure control units to be integrally assembled is reduced by one over the entire surface of one vertical wall constituting the hydraulic pressure control unit chamber.
A method of installing a hydraulic pressure control unit, characterized in that the number of units corresponds to one of the entire surface, the entire three surfaces, and the entire four surfaces. 5. A water pressure control unit installation method according to claim 2, wherein the unit member previously integrated with the supporting hardware is a nitrogen gas container, and another unit member is assembled as a separate step. In addition, after the nitrogen gas container is installed in the water pressure control chamber, the other unit member is mounted on the nitrogen gas container. 6. The hydraulic pressure control unit installation method according to claim 2, wherein a wall metal part of the support metal is used as a vertical wall concrete placing frame of the hydraulic pressure control unit room. How to install the water pressure control unit. 7. In addition to the water pressure control unit according to claim 1, a structure that serves both as a reinforcement and curing at the time of installation from the factory to the construction site of the power plant and installation in the water pressure control unit room or thereafter is used as the support bracket. A water pressure control unit, which is provided integrally. 8. A method for installing a hydraulic pressure control unit according to any one of claims 2 to 6, wherein the hydraulic pressure control unit according to claim 7 is used in place of the hydraulic pressure control unit according to claim 1. How to install the water pressure control unit. 9. A boiling water nuclear power plant in which the water pressure control unit according to claim 1 is installed in a water pressure control unit room of a reactor building.