JPH01267497A - Reactor auxiliary cooling facility - 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] (Industrial Field of Application) The present invention relates to a reactor auxiliary cooling equipment for a nuclear power plant, and particularly to a reactor auxiliary cooling equipment with an improved surge tank.

(Prior Art) Generally, a boiling water nuclear power plant has a reactor auxiliary equipment cooling facility that cools the reactor auxiliary equipment.

Conventionally, this type of reactor auxiliary equipment cooling equipment has, for example, a surge tank 1 configured as shown in FIG. It has become.

The surge tank 1 has a vent line 2 that opens to the atmosphere, and an overflow line 3 that drains the auxiliary cooling water that has overflowed the required water level in each surge tank 1, and the overflow line 3 opens the overflow to the atmosphere. The water is drained into drain funnel 4. These surge tanks 1 are located on the top floor 5 of the reactor building 5 as shown in FIG.
It is installed within the radiation control area 6 of a.

The reason for this is that although the reactor auxiliary equipment cooling equipment is normally clean, it cools the reactor auxiliary equipment that handles radioactive materials, so in the unlikely event that auxiliary equipment cooling water leaks from among these reactor auxiliary equipment. If this occurs, the reactor auxiliary cooling equipment will be contaminated by radiation, and the surge tank 1.1.1 will also be contaminated.

If the surge tank 1.1.1 becomes contaminated with radiation,
Radiation contamination will be diffused to the outside through the vent line 2 that is open to the atmosphere and the drain funnel 4 that is open to the atmosphere.

Therefore, a surge tank 1.1.1 is installed within the radiation controlled area 6 to prevent radiation contamination from spreading outside even if such an accident should occur.

In Fig. 3, numeral 7 is a make-up water line, 8 is a water supply line, 9 is a drain line for draining the auxiliary cooling water in the surge tank 1 to the outside during regular inspections, and 10 is a radiation control area. This is part of the partition wall that partitions 6.

(Problem to be Solved by the Invention) However, in such conventional reactor auxiliary cooling equipment, the surge tank 1 is installed in the radiation control area 6 on the top floor 5a of the reactor building 5, as described above. There are, but
Inside this radiation control area 6, there is a reactor well 11 that houses a reactor pressure vessel (not shown), a fuel boule 12 that stores fuel taken out from the reactor pressure vessel and the reactor well 11 in pool water, and a reactor inside. Since a temporary equipment storage boule 13 for storing equipment, reactor internals, etc. in the pool water is also provided, a maintenance area 14 (fourth There is a problem in that the space (indicated by the dotted chain line in the figure) becomes narrower and the work efficiency during maintenance decreases.

In addition, the water level in the surge tank 1 is checked during daily patrols by the operators, but at this time the operators must change into clothes suitable for entering the radiation controlled area 6.
It's complicated.

Therefore, the present invention was made in consideration of the above circumstances, and its purpose is to expand the maintenance area within the radiation isolation area and provide a reactor auxiliary cooling equipment that can improve the efficiency of maintenance work in that area. It is about providing.

(Structure of the Invention) (Means for Solving the Problems) The present invention provides a surge tank that stores auxiliary cooling water for cooling reactor auxiliary equipment, a vent line that opens to the atmosphere, and a vent line that is connected to the surge tank. In reactor compensation cooling equipment that is equipped with an overflow line that drains overflow water that exceeds the water level into a drain funnel, the surge tank is placed in a non-radiation controlled area, while the atmospheric opening end of this surge tank is placed in a radiation controlled area. The drain funnel is configured to have a closed structure and is watertightly connected to the overflow line.

(Function) The surge tank is installed in a non-radiation controlled area, but since the atmospheric opening end of the surge tank's vent line is open in the radiation controlled area, there is a possibility that the surge tank could be contaminated by radiation. However, this radiation is only guided into the radiation controlled area, and radiation contamination can be prevented from spreading to radiation uncontrolled areas.

In addition, the drain funnel has a sealed structure with no openings to the atmosphere, and is watertightly connected to the overflow line, which prevents drainage from leaking at this connection and prevents the surge tank from leaking. Even if contaminated with radiation, the contamination can be prevented from spreading to radiation-free areas where the surge tank is installed.

Therefore, according to the present invention, since the surge tank can be installed outside the radiation controlled area, it is possible to expand the maintenance area within the radiation controlled area and improve the efficiency of maintenance work in that area. I can do it.

(Example) An example of the present invention will be described below based on FIGS. 1 and 2.

FIG. 2 is a plan view of essential parts of an embodiment of the present invention, and in the figure, the partition wall 21 is the top floor 22a of the reactor building 22.
The radiation control area 23 is located on the outer periphery of the radiation control area or the radiation control area 23. Inside the radiation control area or radiation control area 23, there is a reactor well 25 containing a reactor pressure vessel (not shown), and from this reactor pressure vessel and the reactor well 25. A fuel boule 26 for storing fuel in the pool water and a temporary equipment storage pool 27 for storing reactor internal equipment and reactor structures in the pool water are installed, and a crane (not shown) is operated during maintenance of these. The movable range of
is formed.

A plurality of surge tanks 29, 29, 29 of the reactor auxiliary equipment cooling equipment are installed in the radiation non-control area 24 on the outer periphery of this IIi radiation control area 23, and each surge tank 29 is connected to its vent line 30. Atmospheric opening end 30a
The partition wall 21 is penetrated to open the radiation control area 23 to the atmosphere.

Therefore, even if the surge tank 29 should be contaminated with radiation, the radiation will flow through the open end 30a of the vent line 30 to the radiation control area! 23, and diffusion to the non-radiation control port fffi24 can be prevented.

In addition, when the supplementary cooling water stored in each surge tank 29 exceeds the required water level, the drain end of the overflow line 31 that drains the overflow water is watertightly connected to a drain funnel 32 configured in a sealed structure. are doing.

Therefore, since the drain funnel 32 is sealed without opening to the atmosphere, and the overflow line 30 is connected to the drain funnel 32 in a watertight manner, leakage of waste water at this connection is prevented, and in the event of a surge, Even if the tank 29 is contaminated with radiation, the radiation can be prevented from being diffused into the non-radiation controlled area 24 via the drain funnel 32.

In FIG. 1, numeral 33 is a make-up water line, 34 is a water supply line, and 35 is a drain line.

In this way, the present invention allows each surge tank 29 to be installed in the non-radiation controlled area 24, and it is possible to expand the maintenance area 29 in the radiation controlled area 23, and to perform maintenance work in this maintenance area 29. It is possible to improve the efficiency of

(Effects of the Invention) As explained above, according to the present invention, the surge tank can be installed in a non-radiation controlled area, so it is possible to expand the maintenance area of the radiation controlled area where the surge tank was conventionally installed. , it is possible to improve the efficiency of maintenance work there.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram mainly showing a surge tank of an embodiment of the reactor auxiliary equipment cooling equipment according to the present invention, Fig. 2 is a plan view of the arrangement of the surge tank shown in Fig. FIG. 4 is a configuration diagram mainly showing the surge tank, and FIG. 4 is a plan view of the arrangement of the conventional surge tank shown in FIG. 21... Bulkhead, 23... Radiation control area, 24...
・Radiation non-controlled area, 28...maintenance area,
29... Surge tank, 30... Vent line, 3
0a... Atmospheric frontage end, 31... Overflow line, 32... Drain funnel. Condolence 2 B

Claims (1)

[Claims] A reactor in which a surge tank that stores auxiliary cooling water that cools reactor auxiliary equipment is provided with a vent line that opens to the atmosphere and an overflow line that drains overflow water that exceeds the required water level in the surge tank to a drain funnel. In the auxiliary equipment cooling equipment, the surge tank is installed in a non-radiation controlled area, the atmospheric opening end of the surge tank is opened in the radiation controlled area, and the drain funnel is constructed in a sealed structure to connect to the overflow line. Nuclear reactor auxiliary equipment cooling equipment characterized by watertight connection.