JP2989901B2 - Nuclear power plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear power plant having a static containment cooling system, and more particularly, to simplify the configuration by integrating a pool water cooling system and an auxiliary cooling system of the static containment cooling system. Regarding the planned nuclear power plant.

[0003]

2. Description of the Related Art Conventionally, in a nuclear power plant, as one means of an emergency cooling system for a possible nuclear reactor accident or the like, reactor steam is guided to a condenser by natural circulation without using dynamic equipment and condensed. It is known to have a static containment cooling system that cools water back to the reactor core and containment vessel.

FIG. 2 shows a system configuration example of a nuclear power plant having such a static containment cooling system.

[0005] Above the reactor 1, a cooling water pool (I / C pool) 3 containing a condenser (isolation condenser, hereinafter referred to as I / C) 2 is provided. The isolation condenser 2 and the nuclear reactor 1 are connected by a steam line 4 which is a natural circulation line and an isolation condenser (I / C) return line 5 to form a static containment cooling system.

[0006] A pool water cooling purification system is additionally provided to the static containment cooling system. That is, the I / C pool 3 has a skimmer surge tank 6 in the vicinity, and the pool water extraction pipe 7 is connected to the skimmer surge tank 6. The pool water extraction pipe 7 is connected to a heat exchanger 9a via a pump 8a. A cooling water supply pipe 10 is connected to the heat exchanger 9a.
It is led to C pool 3. A secondary cooling water pipe 13a having a pump 12a is connected to a secondary side of the heat exchanger 9a.

However, in the event of a nuclear reactor accident, the steam generated in the reactor 1 is supplied to the I / C 2 via the steam line 4.
The water condensed by the I / C 2 is supplied again as cooling water to the reactor 1 via the I / C return line 5. The heat generated in the I / C 2 is radiated to the I / C pool 3, and finally the pool water is released to the atmosphere as steam.

On the other hand, even during the normal operation, the I / C 2 radiates some heat, and the temperature of the pool water in the I / C pool 3 rises. Therefore, pool water cooling and purification are performed by the pool water cooling and purification system. That is,
The I / C pool water heated by the heat radiation of the I / C 2 collects in the upper layer of the I / C pool 3 by natural convection. I / C
Since the pool 3 is constantly supplied with cooling water from the cooling water supply line 10, the water overflowing from the I / C pool 3 is guided to the skimmer surge tank 6. Then, the water in the skimmer surge tank 6 is sucked out by the pump 8a through the pool water extraction pipe 7, is removed by the heat exchanger 9a, is purified by the filter 11, and is cooled by the cooling water supply line 10.
To return to the I / C pool 3.

In a nuclear power plant, an auxiliary cooling system is provided for cooling a motor and other various devices attached to a nuclear reactor.

FIG. 3 shows a system configuration of such an auxiliary cooling system.

A cooling water supply pipe 14, a cooling load 15 as an accessory, and a cooling water return pipe 16 constitute a closed loop circulation line in which a pump 8 is provided.
b and a heat exchanger 9b. Heat exchanger 9b
Is connected to a secondary cooling water pipe 13b, and the secondary cooling water is supplied by a secondary cooling water pump 12b. A surge tank 17 is connected to the cooling water return pipe 16 via a downcomer 18 as a buffer for temperature expansion of the circulating system water.

Then, the system water cools the cooling load 15 to increase the temperature, and is sent to the heat exchanger 9b via the cooling water return pipe 16 by the pump 8b of the cooling water return pipe 16. The cooling water cooled by the heat exchanger 9b cools the cooling load 15 again via the cooling water supply pipe 14. The temperature expansion of the system water is adjusted by a surge tank 17 as a shock absorber.

[0013]

As described above, in the conventional nuclear power plant, the pool water cooling / purification system of the static containment vessel cooling system and the auxiliary cooling system are similar in equipment configuration. These are provided individually while having similar functions. Therefore, in one plant, the pump, the heat exchanger, the secondary cooling system, and the like are provided in both systems in an overlapping manner, which is uneconomical in terms of physical quantity and arrangement.

The present invention has been made in view of such circumstances, and the pump, heat exchanger, piping, etc. of the pool water cooling purification system and the auxiliary equipment cooling system can be used in common, whereby the structure can be simplified. The purpose is to provide a plant. [Configuration of the invention]

[0015]

SUMMARY OF THE INVENTION The present invention provides a static containment cooling system comprising a reactor and a condenser housed in a cooling pool connected by a circulation line, and a cooling pool for the static containment cooling system. Pool water cooling system for cooling and filtering and washing by circulating the pool water in a circulation line having a pump, a heat exchanger and a filter, and the cooling pool for the pump and heat exchanger in piping of the pool water cooling system And an auxiliary equipment cooling system having accessory equipment of the nuclear reactor as a cooling load, connected in parallel via a branch pipe.

[0016]

According to the present invention, heat generated in the I / C and the cooling load is removed by the same heat exchanger.

[0017]

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

FIG. 1 shows a system configuration of a nuclear power plant according to this embodiment.

A cooling water pool (I / I) containing a condenser (isolation condenser) 22 is provided above the reactor 21.
C pool) 23 is provided. The I / C 23 and the reactor 21 are connected by a steam line 24 and an I / C return line 25, which are natural circulation lines, to form a static containment vessel cooling system.

A pool water cooling / purifying system is additionally provided to the static containment vessel cooling system. That is, the I / C pool 23
Has a skimmer surge tank 26 in the vicinity, and a pool water extraction pipe 27 is connected to the skimmer surge tank 26. The pool water extraction pipe 27 is connected to a heat exchanger 29 via a pump 28. The cooling water supply pipe 30 is connected to the heat exchanger 29, and is led to the I / C pool 23 via the filter 31. A secondary cooling water pipe 33 having a pump 32 is connected to a secondary side of the heat exchanger 29.

In this apparatus, an auxiliary equipment cooling system is constituted by utilizing a part of the pool water cooling system piping. That is, the pump 28 and the heat exchanger 29 are provided between the pool water extraction pipe 27 of the pool water cooling system and the cooling water supply pipe 30.
The cooling water supply pipe 34 and the cooling water return pipe 36 are provided as branch pipes in parallel with the cooling pool 23, and the auxiliary equipment of the reactor as the cooling load 35 is connected between them.

Next, the operation will be described.

The I / C 22 functions as a heat sink for reactor heat at the time of a reactor accident, but heat is transferred from the reactor 21 to the I / C 22 via the steam line 24 even during normal operation. Due to the heat radiation from the I / C 22, the water in the I / C pool 23 is heated. Always in the I / C pool 23,
Since the cooling water is supplied from the cooling water supply pipe 30,
The heated pool water is transferred from a pool water extraction pipe 27 to a heat exchanger 29 via a pump 28.

The cooling water cooled in the heat exchanger 29 is partially purified through a cooling water supply pipe 30 through a filter 31 and supplied to the I / C pool 23 as cooling water.

On the other hand, the remaining cooling water is supplied to the cooling water supply pipe 3
From 0, it branches into a cooling water supply pipe 34 and flows into a cooling load 35 which is various devices in the plant. Thus, the heat generated in the cooling load 35 is removed, and the cooling water of the auxiliary cooling system, which has been heated after finishing the work, is also returned to the cooling water return pipe 36.
And merges with the cooling water of the pool water extraction pipe 27. The combined I / C pool water and the cooling water heated by the work with the cooling load 35 and heated are transferred to the heat exchanger 29 by the pump 28.

According to the above embodiment, a part of the pump 28, the heat exchanger 29, and the piping of the I / C pool cooling / purifying system are shared as a part of the auxiliary equipment cooling system pump, the heat exchanger, and the piping. You. Therefore, using a shared configuration, I
Since both the cooling of the / C pool water and the cooling load can be performed, the number of pumps, heat exchangers and piping equipment can be reduced, and the cost can be reduced.

Also, by sharing the I / C pool cooling purification system and the auxiliary equipment cooling system, the function of the surge tank, which was conventionally installed as a buffer for the thermal expansion of the auxiliary equipment cooling system, can be replaced by the I / C pool cooling system. Purification skimmer surge tank 26
Can be substituted. Therefore, the conventional surge tank can also be eliminated, and cost reduction can be expected.

[0028]

As described above, according to the present invention, a part of the pump, heat exchanger, and piping of the pool water cooling / purifying system are shared with the auxiliary cooling system, so that the pump, the heat exchanger, and the piping equipment are provided. In addition to being able to reduce the cost, the cost can be reduced, and the function of the surge tank installed as a buffer for thermal expansion in the conventional auxiliary equipment cooling system is replaced with a skimmer surge tank of the pool water cooling purification system. It is also possible to eliminate the surge tank described above, etc., thereby achieving effects such as cost reduction.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of a nuclear power plant according to the present invention.

FIG. 2 is a system diagram of a conventional I / C pool cooling and purifying system.

FIG. 3 is a system diagram of a supplementary cooling system.

[Explanation of symbols]

 11 Filter 21 Reactor 22 Isolation Condenser (Condenser) 23 I / C Pool (Cooling Water Pool) 24 Steam Line (Natural Circulation Line) 25 I / C Return Line 27 Pool Water Extraction Pipe 28 Pump 29 Heat Exchanger 30 Cooling Water supply pipe 31 Filter 34 Cooling water supply pipe (branch pipe) 35 Cooling load 36 Cooling water return pipe (branch pipe)

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G21C 15/18 G21C 19/07 G21D 1/00

Claims (1)

(57) [Claims] 1. A static containment vessel cooling system in which a reactor and a condenser housed in a cooling pool are connected by a circulation line, and a pool water of a cooling pool of the static containment cooling system is pumped and heat exchanged. A pool water cooling system for cooling and filtering and washing by circulating in a circulation line having a vessel and a filter; And an auxiliary cooling system having auxiliary equipment of the nuclear reactor as a cooling load on a branch pipe of the nuclear power plant.