JPS61155796A - Nuclear power plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a nuclear power plant, and more particularly to a nuclear power plant in which a single emergency gas treatment system can be shared by a plurality of reactor buildings.

[Technical background of the invention and its problems]

In a nuclear power plant, in the event of a reactor accident, negative pressure is maintained inside the reactor building, radioactive materials leaked from the reactor containment vessel are removed through a filter system, and the purified air is released into the atmosphere through the main stack. An emergency gas treatment system (hereinafter abbreviated as 5GTS) is provided as equipment for discharging gas.

FIG. 2 is a schematic diagram showing an example of a conventional 5GTS. In the figure, reference numeral 11 indicates a reactor building, and a reactor containment vessel 13 housing a reactor pressure vessel 12 is disposed within this reactor building 11. A turbine building 14 is connected to the nuclear reactor 111, and two systems of exhaust fans 15 and filter trains 16 constituting a 5GTS are installed in the turbine building @14. One system among the 5GTS has the ability to treat 100% of the atmosphere inside the nuclear reactor 111111 in one day, and the other system is in reserve. reactor 111
The suction sides of 11 and 5GTS are connected by a pipe 17. Further, the exhaust side of the 5GTS is connected by a pipe 19 to a main exhaust stack 18 constructed at a location different from the turbine 11114. In addition, since the main exhaust stack 18 is shared by two or more reactor buildings, the 5GTS of other reactor mIl
The pipe 19a is also connected.

In such a 5GTS, 2!13 inside the reactor building
If there is a leak of radioactive material from the
5 sucks the atmosphere (air) inside the reactor building 11,
Radioactive substances are removed through filter train 16. The purified air passes through the pipe 19 to the turbine building 1.
114 to the main exhaust mis and is discharged into the atmosphere.

By the way, in a conventional nuclear power plant, 5GTS is installed in each reactor building.

For this reason, the turbine building 1 connected to the reactor building 11
4, the installation F scale has become larger, causing an increase in construction area and installation cost. In addition, 5GTS is used in the event of an accident or reactor lJ! Since it only operates when the ventilation system for regular indoor use is stopped, it operates extremely infrequently, but it requires operation tests and regular maintenance and inspections, so there is a desire to reduce maintenance costs.

In addition, in order to reduce the cost of the main exhaust N18, it is effective to lower the height of the main exhaust [18]. One possible method is to install it in However, because the main exhaust stack is higher and has a sharper structure than other buildings, it is more prone to lightning strikes. If the main exhaust stack is struck by lightning, it can cause disturbances to the electrical system within the nuclear power plant, such as the control system. may cause adverse effects on the safety of nuclear reactor operation.

(Object of the invention) The present invention has been made in consideration of these points,
The purpose of the present invention is to provide a nuclear power plant that can reduce the facility area of the nuclear power plant, facilitate the maintenance and management of 5GTS, and reduce the cost of the main exhaust stack.

(Summary of the invention) The present invention relates to a nuclear power plant (, I
I; (7 reactor buildings with reactor containment vessels installed, and 5 GTS (emergency gas treatment system) built separately from these reactor buildings, with a main structure at the top. and an exhaust wI building in which an exhaust stack is installed, and each of the plurality of reactor buildings is connected to the 5GTS in the exhaust stack building by a pipe through which the atmosphere inside the reactor building passes. There is.

According to the present invention, since the exhaust stack building in which the SG rs is built can be shared by multiple reactor laden buildings,
By significantly reducing the facility area of 5GTS, it is possible to reduce the facility area of nuclear power plants. Also, 5
Since the number of GTS facilities is reduced, their maintenance and inspection work can be streamlined. Furthermore, since the main exhaust stack is installed at the top of the stack building, which does not contain the reactor containment vessel or control system, it reduces construction costs while avoiding the negative impact of lightning strikes on the nuclear power plant. can be achieved.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 21 denotes a reactor building, and a reactor containment vessel 23 in which a reactor pressure vessel 22 is housed is disposed within this reactor building 21. Furthermore, a turbine building 24 in which a turbine, a generator, and the like are installed is connected to the reactor building 21 .

Reference numeral 30 denotes an exhaust stack building, which is constructed separately from the reactor building 21 and the turbine building 24, and is equipped with an exhaust fan and a filter train inside.
GTS is installed. The exhaust fan 25 is divided into three systems, and an on-off valve 31 is provided on each inlet side. Furthermore, two separate filter trains 26 are connected to the downstream side of the exhaust fan 25 via an on-off valve 32 . At the top of the exhaust stack building 30, there is a main exhaust stack 2.
8 is installed, and the downstream side of the filter train 26 is connected to the main exhaust pipe 28 by a pipe 34 via an on-off valve 33.

Such an exhaust stack building 30 includes a plurality of atomic detached houses 121.
Only one building has been constructed for 21a, and 5GTS is being shared. That is, multiple reactor buildings 21, 218
are the piping 3 for the 5GTS in the exhaust pipe ``30''.
5.35a. This piping 35, 35
A is for guiding the atmosphere inside the nuclear detached house 1m21.21a to the exhaust stack building 30, and the reactor containment vessel 23゜23
8 and open to the space inside Atomic detached house ff121.21a. Furthermore, on-off valves 36 are provided in the middle of the pipes 35 and 358, respectively.

The power supply necessary for the operation of the 5GTS is connected to an emergency bus that is powered by an emergency diesel generator provided in each plant, in addition to the normal in-plant power bus.

Next, the operation of this embodiment having such a configuration will be explained.

When an accident occurs at a nuclear reactor plant, the reactor building is damaged.
In response to the power supply signal, dry well pressure high signal, reactor water level low signal, or manual signal from the central control room, the reactor building regular ventilation system is shut down, the reactor building 21 is isolated from the outside, and the 5GTS is activated. .

When the 5GTS starts, after confirming that there are no problems, the exhaust fan 25 and filter train 26 are
System operation is carried out. By operating the exhaust fan 25, the atmosphere (air) inside the reactor containment vessel 23 and the reactor building 21 is guided to the 5GTS of the stack building 130 through the pipe 35. The atmosphere is passed through filter train 26 to remove radioactive materials, and then passed through piping 34 to main stack 28 for release to the atmosphere.

Each pipe 35, 35a is provided with an on-off valve 36, and each exhaust fan 25 and filter train 26 can be operated independently, so the reactor plants other than the one where the accident occurred are You can continue driving normally.

In addition, the power required for the operation of the 5GTS can be supplied from the emergency diesel generator installed in each plant, so even in the event of a loss of power at the plant, the 5GTS can be operated.
can be operated.

As described above, according to this embodiment, the exhaust stack building 30 containing the 5GTS can be shared by a plurality of reactor buildings, and the nuclear power plant can be downsized.

Furthermore, since the number of 5GTS installed can be reduced, maintenance and inspection can be facilitated, and construction costs can be reduced. In addition, multiple reactor buildings 21.21
8 and 5GTS are connected by pipes 35.35a each having an on-off valve 36 in the middle, so in the event of an accident, 5GTS is activated only in the reactor plant where the accident occurred, and other normal plants are operated. can continue driving.

In addition, there is a main exhaust l on the top of the exhaust stack building 1130! Since i28 is installed, while maintaining the height of the top of the main exhaust pipe 28,
The length of the main exhaust pipe 28 itself can be shortened, and the construction cost of the main exhaust pipe 1i28 can be reduced. Note that the main exhaust 1128 is installed in an exhaust stack building 30 that is not equipped with an electrical system such as a control room, and this exhaust stack building 30 is constructed separately from the reactor buildings 21 and 218. Therefore, even if the main exhaust stack 28 is struck by lightning, it will cause a disturbance to the electrical system inside the nuclear detached house 121.21a.
The negative effect of making the operation of a nuclear reactor plant difficult can be avoided.

In this embodiment, the filter train 26 is installed downstream of the exhaust fan 25, but the filter train 26 may be installed upstream of the exhaust fan 25. In addition to using an emergency diesel generator installed in each plant as an emergency power source for the 5GTS, a diesel generator can also be installed in the exhaust stack building 30 and used.

(Effects of the Invention) As explained above, according to the present invention, the stack building containing the 5GTS is shared by multiple reactor plants, thereby reducing the size of the reactor plant base. At the same time, the facility area of the entire nuclear power plant can be reduced. Furthermore, by reducing the number of 5GTSs installed, maintenance and inspection of the 5GTSs can be made easier.

Furthermore, by installing the main exhaust stack at the top of the exhaust stack building, it is possible to reduce the construction cost of the main exhaust stack while avoiding damage caused by lightning strikes.

The present invention is particularly effective when constructing more atomic couplants within the same site.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a nuclear power plant according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional nuclear power plant. 21.21a...Reactor building, 24.24a...Turbine building, 25...Exhaust fan, 26...Filter train, 28...Main exhaust stack, 30...Exhaust section side L35. 35a...Piping, 36...Opening/closing valve.

Claims (1)

[Scope of Claims] 1. A reactor building containing a plurality of reactor buildings in which reactor containment vessels are arranged, and an emergency gas treatment system constructed separately from these reactor buildings; an exhaust stack building in which a main exhaust stack is installed at the top, and each of the plurality of reactor buildings is connected to an emergency gas treatment system in the exhaust stack building by a pipe through which the atmosphere inside the reactor building passes. Nuclear power plant. 2. Claim 1, characterized in that an on-off valve is disposed in each of the pipes connecting the plurality of reactor buildings and the emergency gas treatment system in the stack building. nuclear power plant.