JPH11174189A - Reactor building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a reactor building and improve maintenance and inspection property when exchanging a spent fuel, by installing a cylindrical wall outside a reactor primary storage container, and installing a shaft that can be connected to each floor in contact with the outer side of the cylindrical wall. SOLUTION: An emergency reactor core cooling system pump/heat exchanger/ pipe space 4 are arranged around a reactor primary storage container 2, a cylindrical wall 5 for involving these is installed along an entire periphery, and an elevator/step shaft 6 is installed in contact with the outside of the cylindrical wall 5. A doughnut-type plane space is constituted between the reactor primary storage container 2 and the cylindrical wall 5 and the space can be effectively utilized as an equipment installation space, thus miniaturizing an entire reactor building 7. A spent fuel storage pool is installed on the uppermost floor operation floor of the reactor building 7 and a crescent-shaped area is constituted as a space. the crescent-shaped area has an improved space efficiency, and a reactor pressure container lid, a reactor primary storage container lid, and the like can be tentatively installed, thus improving maintenance and inspection property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling water nuclear power plant for generating electricity by driving a steam turbine with steam generated by a reactor pressure vessel.
Primary reactor containment vessel containing the reactor pressure vessel, emergency core cooling system pump, heat exchanger, piping for cooling the reactor pressure vessel, and also burned in the reactor pressure vessel and become used Related to the reactor building that stores the spent fuel storage pool that stores the spent fuel, especially the downsizing of the building,
The present invention relates to a layout configuration of a reactor building suitable for improving maintenance and inspection of equipment.

[0002]

2. Description of the Related Art Among various facilities in a nuclear power plant, a reactor building is the most important facility for storing a reactor pressure vessel for generating steam and a primary containment vessel for storing the reactor pressure vessel, Spent fuel that houses an emergency core cooling system pump, heat exchanger, piping for water injection and cooling to the reactor pressure vessel, and also cools and stores fuel burned in the reactor pressure vessel for a long period of time The storage pool is housed in a solid building with multiple protected walls and has sufficient shielding and seismic design.

[0003] The requirements for the layout of the reactor building are as follows. First, the reactor pressure vessel is connected to the reactor pressure vessel main body and the reactor pressure vessel, piping for transferring steam to the turbine, and A primary containment vessel for the reactor, which houses the entire suppression pool, which is a water source for cooling the reactor core, is installed to protect the reactor pressure vessel. Around the reactor primary containment vessel, a secondary cooling system consisting of an emergency core cooling system pump, heat exchanger, piping using the suppression pool as a water source, and a wall and ceiling containing the spent fuel storage pool described above A containment vessel is installed. This secondary storage container is an area for enclosing the radioactive material in the secondary storage container even if it is assumed that the radioactive material has leaked from the primary storage container and allowing the filter to remove the radioactive material.

[0004] As described above, the reactor building has a multiply-protected shape and configuration having a reactor primary pressure vessel, a primary containment vessel, a secondary containment vessel, and an outer wall on the outermost periphery centering on the reactor pressure vessel. I have.

[0005] Examples of the layout of the reactor building include Japanese Patent Publication No. 7-21552 and Japanese Patent Application No. 7-173186. In each case, a reactor made of strong concrete or steel is used mainly for a reactor pressure vessel. A primary containment vessel is installed. In addition, since this primary containment vessel has a pressure-resistant design, it is formed of a circular structure in a plane.

On the other hand, a rectangular secondary containment is installed around the primary containment of the nuclear reactor. In this secondary containment vessel, safety-critical equipment such as an emergency core cooling system pump, a heat exchanger, and piping, and a spent fuel storage pool are installed. The spent fuel storage pool is installed on the top floor of the reactor building, called the operating floor, and when removing spent fuel from the reactor pressure vessel, the operating floor contains the reactor pressure vessel lid and the reactor primary This is a space for temporarily storing the containment lid.
Checkability is improved.

[0007]

As described above, the reactor building is multiply protected and designed to be extremely safe, and its basic configuration cannot be changed. However, the building shape and layout can be improved while maintaining the basic configuration for safety.

In recent years, there has been an increasing demand for nuclear power generation facilities to be more economical, and furthermore to be easier for humans to facilitate maintenance and inspection. Combinations with a surrounding rectangular secondary containment are no longer able to meet these requirements.

SUMMARY OF THE INVENTION An object of the present invention is to provide a nuclear power plant which aims to improve the maintenance and inspection performance at the time of spent fuel replacement by making the reactor building compact by changing the layout configuration and expanding the top floor (operating floor). To provide.

[0010]

In order to solve the above problems, it is necessary to change the layout configuration of the reactor building while maintaining the basic configuration of the reactor building described in the prior art.

First, a cylindrical wall surrounding the primary containment vessel, the emergency cooling system pump, the heat exchanger, and the piping is installed outside the conventional primary containment vessel. This cylindrical wall is set up to the top floor of the reactor building where the spent fuel pool is installed and is called the operating floor, and this wall is used as the wall of the secondary containment vessel.

Next, a shaft which can be connected to each floor in contact with the cylindrical wall is installed outside the cylindrical wall. Further, when it is necessary to install a room outside the cylindrical wall, a room having the cylindrical wall as one side is installed. This room may be a room outside of the secondary containment vessel in which emergency electrical equipment is installed by using the cylindrical wall as a boundary. On the other hand, by installing an opening in the cylindrical wall, it can also be used as a secondary containment vessel,
This can be selected depending on the presence or absence of the opening according to the layout condition.

That is, by installing a secondary containment vessel constituted by a similar cylindrical wall around a primary containment vessel of a nuclear reactor, which is a cylindrical structure, the space of the corner portion by a combination of a conventional circle and a rectangle is conventionally provided. Can be deleted,
The entire plane space can be used efficiently, the plane dimensions of the building can be reduced, and the reactor building can be made more compact.

By installing this cylindrical wall up to the top floor, a crescent-shaped space can be concentrated and secured near the spent fuel storage pool. For this reason, the effective space for the temporary storage facilities for transferring spent fuel from the reactor pressure vessel to the spent fuel pool, such as the lid of the reactor pressure vessel and the lid of the primary containment vessel, can be secured efficiently. Maintenance·
Checkability is improved.

The shaft circumscribing the cylindrical wall can be used as an elevator and stairs for personnel communicating with each floor of the reactor building, and as a shaft for connecting piping and electric cables.
Here, the dimensions of the elevators and stairs are required to be about 3m, but if they are installed inside the cylindrical wall, it will hinder the compactness of the reactor building. , Which can contribute to downsizing of the building.

Further, when it is necessary to install a room outside the cylindrical wall, rooms circumscribing the cylindrical wall are installed at four corners. There is no opening in the cylindrical wall that is one side of the room at the four corners
By completely cutting off the edge, it is possible to install emergency electrical equipment etc. that does not need to be installed in the secondary containment vessel, and the electric cable from the electrical equipment to the emergency core cooling system pump etc. through the cylindrical wall is the shortest and easy Can be connected to

Further, if the diameter of the cylindrical wall is increased due to the installation of the emergency cooling pump, the heat exchanger, and the piping, the entire building cannot be made compact. Since these devices use the suppression pool as a water source, they must be installed at the lowest basement floor from the viewpoint of ensuring the suction function of the pump. The rooms circumscribing the wall will be set up at the four corners. These four corner rooms can be used as a secondary containment as well as the inside of the cylindrical wall by installing openings for personnel access in the cylindrical wall, and this room has a part of the emergency core cooling system equipment. Can be installed in the secondary containment vessel without increasing the diameter of the cylindrical wall. Further, since one side of each of the four corner walls is formed of a cylindrical wall, piping and electric cables between the inside and outside of the cylindrical wall (the donut-shaped space inside the cylindrical wall and the four corner rooms) can be easily connected with the shortest route.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described below with reference to FIGS.

FIG. 1 is a view for explaining the floor of the lowest basement of the layout structure of a reactor building according to claims 1 and 2 of the present invention. An emergency core cooling system pump / heat exchanger / piping space 4 is installed all around the reactor primary containment vessel 2 that houses the reactor pressure vessel 1 (not shown) and the suppression pool 3, and has a cylindrical shape containing these. The wall 5 is installed all around. In contact with the main cylindrical wall outside the cylindrical wall 5, the elevator
The stair shaft 6 is installed.

A donut-shaped flat space is formed between the primary containment vessel 2 and the cylindrical wall 5, and the entire 360 ° circumference of this space is used as an emergency core cooling pump, heat exchanger, and piping space 4. And elevator / stair shaft 6
Is outside the cylindrical wall 5, so that the diameter of the cylindrical wall 5 can be reduced and the donut-shaped space can be effectively used as an equipment installation space, so that the entire reactor building 7 can be made compact.

FIG. 2 illustrates the top floor (operating floor) plane of the layout structure of the reactor building according to claims 1 and 2 of the present invention. A spent fuel pool 9 is installed on the operating floor 8. The operating floor 8 is separated from the building exterior by the cylindrical wall 5, and the crescent area 10 is configured as a space in the 0 ° -180 ° direction in this drawing. In the conventional reactor building, the wall corresponding to the cylindrical wall 5 has a rectangular shape, so that there is a vertically long narrow space around the spent fuel pool,
In the present invention, the reactor pressure vessel lid 11, the primary containment vessel lid 12, and the like can be temporarily placed in the crescent area with good space efficiency, and the maintenance and inspection properties are improved.

In FIGS. 1 and 2, the cylindrical wall also serves as the secondary containment wall.

FIG. 3 illustrates a cross section of a reactor building according to claims 1 and 2 of the present invention. Reactor pressure vessel 1,
A cylindrical wall 5 surrounding the whole of the primary containment vessel 2 for storing the suppression pool 3 is installed, and an elevator / stair shaft 6 is installed in contact with the outside of the cylindrical wall 5.
In addition, a spent fuel pool 9 is installed on the operating floor 8 on the top floor of the reactor building. The entire secondary containment is constituted by a cylindrical wall 5, and personnel access to each floor can be reached by an elevator / stair shaft 6.

FIG. 4 illustrates the lowermost floor of the layout configuration of the reactor building according to claim 3 of the present invention. Outside room 13 having cylindrical wall 5 as one side outside cylindrical wall 5
Is installed. Since the outer room 13 is completely separated by the cylindrical wall 5, this room does not need to be installed in the secondary containment, or can be used as a room for installing electrics and the like that cannot be installed in the secondary containment. . In this case, the electric cable connecting the external room 13 and the emergency core cooling system pump in the cylindrical wall 5 can be easily connected via the cylindrical wall 5.

FIG. 5 is a view for explaining the lowest basement floor of the layout structure of the reactor building according to claim 4 of the present invention. Outside room 13 having cylindrical wall 5 as one side outside cylindrical wall 5
Is installed. By providing an opening 14 in the cylindrical wall 5 in the external room 13, the secondary storage container in the cylindrical wall 5 communicates with the external room, and the outer wall 15 of the external room 13 becomes a boundary of the secondary storage container.

By installing a part of the emergency core cooling system pump, heat exchanger, and piping space equipment in the cylindrical wall 5 in the external room 13, it is possible to suppress an increase in the diameter of the cylindrical wall 5. Thus, a compact reactor building can be achieved. Also in this case, since the external room 13 and the space inside the cylindrical wall 5 are in contact with each other by the cylindrical wall 5, communication between the piping and the electric cable inside and outside the cylindrical wall can be minimized.

[0027]

According to the present invention, the following effects can be obtained without impairing the safety of the conventional reactor building.

(1) Compact reactor building (2) Improve maintenance / inspection performance when transferring spent fuel

[Brief description of the drawings]

FIG. 1 is a diagram showing a floor of the lowest basement of a layout configuration of a reactor building according to an embodiment of the present invention.

FIG. 2 is a diagram showing a top floor (operating floor) plane of a layout configuration of a reactor building according to an embodiment of the present invention.

FIG. 3 is a diagram showing a cross section of a reactor building according to an embodiment of the present invention.

FIG. 4 is a diagram showing the lowest basement floor of the layout configuration of the reactor building according to the embodiment of the present invention.

FIG. 5 is a diagram showing the lowest basement floor of the layout configuration of the reactor building according to the embodiment of the present invention.

[Explanation of symbols]

1 ... Reactor pressure vessel, 2 ... Suppression pool, 3 ...
Primary reactor containment vessel, 4 ... Emergency core cooling system pump, heat exchanger, piping space, 5 ... Cylindrical wall, 6 ... Elevator
Stair shaft, 7 ... Reactor building, 8 ... Operating floor, 9 ... Spent fuel storage pool, 10 ... Crescent area, 11 ... Reactor pressure vessel lid, 12 ... Reactor primary containment lid, 13 ... External room, 14 ... opening, 15 ... outer wall.

Claims (4)

[Claims] 1. A reactor primary containment for storing a reactor pressure vessel, the reactor pressure vessel, and a suppression pool serving as a cooling water source for the reactor pressure vessel, the reactor primary containment, and the inside of the reactor primary containment. The above-mentioned suppression pool is used as a water source, and an emergency core cooling system pump / heat exchanger / pipe for injecting / cooling the reactor pressure vessel and a spent fuel for storing spent fuel taken out from the reactor pressure vessel. A secondary containment that surrounds the entire storage pool,
And a reactor building for storing emergency electrical components for driving and controlling the emergency core cooling system pump, the reactor containment vessel, the emergency core cooling system pump, heat exchanger, piping, and spent fuel storage. A reactor building, wherein a cylindrical wall is installed outside a pool, and a shaft is installed outside the cylindrical wall and in contact with the cylindrical wall and connecting each floor. 2. A nuclear reactor building according to claim 1, wherein said cylindrical wall and said shaft are walls forming a secondary containment vessel. 3. A room having a cylindrical wall as one side wall is provided outside the cylindrical wall of a part or all floors of the reactor building having the cylindrical wall according to claim 1 above. Reactor building. 4. A reactor building according to claim 3, wherein an opening is provided in a cylindrical wall of a room having the cylindrical wall as one side.