JPH0224595A - 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 [Object of the Invention] (Field of Industrial Application) The present invention relates to a nuclear power plant used in a nuclear power plant.

(Prior Art) Radiation control categories in a conventional nuclear power plant will be explained with reference to FIG.

FIG. 2 shows an example of a building configuration of a nuclear power plant 20 in a nuclear power plant. The reactor building 1 and the turbine building 2 house a nuclear reactor, a turbine generator, and the like (not shown) as equipment for generating power using steam.

The service building 3 is installed for the purpose of controlling the entry and exit of employees and the like to each facility of the power plant, and houses equipment such as radiation measuring machines.

Furthermore, the equipment necessary for a nuclear power plant includes control equipment,
There will be waste treatment facilities, and the building configuration is not limited to that shown in Figure 3.

Radiation control of the reactor building 1 and turbine building 2 is as follows:
It is divided into an unmanaged area 4 and a managed area 5.

In the uncontrolled area 4, equipment is placed that does not exceed the radiation dose and radioactive contamination level stipulated by law.

On the other hand, in the managed area 5, contrary to the unmanaged area 4, facilities that exceed the above regulations are arranged. Uncontrolled area 4 and controlled area 5
The area divisions are separated by concrete walls (not shown), and access from the service building 3 is also ensured independently. Note that in FIG. 3, arrows indicate directions in which people enter and exit.

By the way, due to recent technical advances in turbine building equipment, even if radioactive contamination increases in the event of a plant accident, radioactive contamination is significantly reduced during normal operation and periodic inspections.

For this reason, even if the equipment is in a controlled area due to the system configuration.

During normal operation and periodic inspections, some facilities are classified as uncontrolled areas due to pollution classification.

In addition, because equipment with high levels of contamination and equipment with low levels of contamination are located in the same area, it is difficult to reduce the number of equipment for entry and exit of workers, even for equipment with low levels of radioactive contamination.

(Problem to be Solved by the Invention) As mentioned above, in the conventional radiation control classification, high-contamination equipment and low-contamination equipment in the management area are in the same area classification and have the same access route. There was an excess of equipment for entering and leaving the area.

The present invention has been made with these points in mind, and is a nuclear power plant that reduces the need for equipment to enter and exit the controlled area of a turbine building, and thereby reduces waste and improves work time efficiency. The purpose is to provide plants.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention divides the control area of the turbine building into two sections based on the level of radiation dose and radioactive contamination, and separates the zone sections with a wall. Nuclear power plants are characterized by having their own access routes, and access routes for controlled areas and semi-controlled areas are shared, and entrance/exit control areas are established to prevent mixed access by personnel within the turbine building. To provide a nuclear power plant characterized in that there are two access routes, the above-mentioned access route and an uncontrolled area route.

(Function) In a nuclear power plant configured in this manner, the highly contaminated equipment and the low contaminated equipment are divided, and each access route is made independent, making it possible to reduce the number of entry and exit equipment in the low contaminated area.

Furthermore, since the time required to enter and leave the facility is shortened, the actual working time is increased, and waste can be reduced.

(Example) A first example of the present invention will be described below with reference to FIG. FIG. 1 is a schematic plan view showing a first embodiment of a nuclear power plant according to the present invention.

It should be noted that the same parts as in the prior art are given the same reference numerals and detailed explanations will be omitted.

In FIG. 1, the controlled area of the turbine building 12 is composed of two sections: a controlled area 13 and a semi-controlled area 14.

The controlled area 13 is an equipment area where it is difficult to reduce access equipment due to the level of radioactive contamination, and the semi-controlled area 14 is an equipment area where the radiation level and radioactive contamination are almost the same as non-controlled areas. Ru. The division of the area divisions in FIG. 1 is for illustrative purposes only, and the actual division of the turbine building area divisions is not limited to this.

Access from the service building 3 is through individual access routes 15° 16, 17, 7 to the uncontrolled area 4, the controlled area 13, the semi-controlled area 14, and the uncontrolled area 4 of the reactor building 1.
There is no spread of radioactive contamination due to contact with workers along the entry/exit routes to each zone.

With the turbine building as described above, the controlled area equipment can be divided into two sections to enable radiation control.

Therefore, according to the nuclear power plant according to the first embodiment of the present invention, it is possible to reduce the amount of equipment needed to enter and exit the controlled area, and thereby the actual working time can be increased.

It is possible to reduce waste.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic plan view showing a second embodiment of the nuclear power plant according to the present invention.

Note that the same parts as in FIG. 1 are designated by the same reference numerals and detailed explanations will be omitted.

In FIG. 2, access from the service building 3 to the controlled area 13 and the semi-controlled area 14 of the turbine building 18 is shared, and the controlled area 13 and the semi-controlled area 14 are accessed from the access control area 11 in the turbine building 18. access is possible.

The shared controlled area/semi-controlled area access route 19 will be used by workers from two categories, but the possibility of contamination spreading on the access route 19 is small and it is difficult to enter or leave each area. Since the area is controlled by the entry/exit control area 11, there is no worry that vehicle control area workers will be exposed to radiation from the controlled area equipment.

With the turbine building as described above, radiation control can be divided into three zones: controlled area, semi-controlled area, and non-controlled area, making it possible to have two access routes from the service building to the turbine building.

Therefore, according to the nuclear power plant according to the second embodiment of the present invention, the number of access routes from the service building can be reduced to two in the radiation control classification based on three area classifications: uncontrolled area, controlled area, and semi-controlled area. , restrictions on layout planning can be reduced.

〔Effect of the invention〕

According to the nuclear power plant according to the present invention, the radiation control classification of the turbine building is divided into three areas: non-controlled area, controlled area, and semi-controlled area.
Since it is divided into areas, it is possible to reduce the need for entry and exit equipment for managed areas.
Accordingly, the actual working time can be increased and the amount of waste generated can be reduced.

[Brief explanation of the drawing]

fs1@ is a schematic plan view of a nuclear power plant showing a first embodiment of the present invention, FIG. 2 is a schematic plan view of a nuclear power plant showing a second embodiment of the present invention, and FIG. 3 is a conventional example of a nuclear power plant. FIG. 1... Reactor building 3... Service building 4
...Uncontrolled area 5,13...Controlled area 7
, 15.16.17.19...access route 11
...Entry/exit control area 14...Semi-controlled area agent Patent attorney Noriyuki Chika Ken Yudo Daishimaru Ken Figure 1 Figure 1

Claims (2)

[Claims] (1) The turbine building, which houses the turbines inside, is divided into three radiation control areas: a non-controlled area, high radiation dose and radioactive contamination areas, and low radioactive contamination areas. A nuclear power plant characterized in that entry and exit access routes into and out of area divisions are independently set for each area division. (2) The turbine building, which houses the turbines inside, is divided into three radiation control areas: an uncontrolled area, high radiation dose and radioactive contamination areas, and low radioactive contamination areas. Access routes from the service building to this divided uncontrolled area are set independently, and access routes from the service building to the high radiation dose and radioactive contamination areas and low radioactive contamination areas in the turbine building are established. A nuclear power plant characterized by sharing a route and arranging an entry/exit control area for the shared access route inside a turbine building.