JPH10325891A - Replenishment water facility for reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reactor emergency replenishment water facility for reducing the construction costs of a reactor power station. SOLUTION: Water is stored in an equipment storage pit 8 being provided on the operation floor of a reactor building in advance, and water is supplied from the equipment storage pit 8 to a water-pouring pump 2 instead of a steam storage bath 1 on emergency, thus eliminating the need for the steam storage bath. Also, water is supplied from the equipment storage pit 8 to a fuel pool cooling purification pump 9 for pouring water to a used fuel pool 7, thus eliminating the need for a suppression pool purification pump and reducing construction costs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water injection system for supplying water to a nuclear reactor in an emergency and a nuclear reactor make-up water supply system for supplying make-up water to a spent fuel storage pool.

[0002]

2. Description of the Related Art In general, in a nuclear power plant, a dedicated water tank or pool is provided as a water source to be injected into a nuclear reactor in an emergency or a source of make-up water for a spent fuel storage pool, and water is stored and used as needed. The water is transferred by a pump.

FIG. 4 is a system configuration diagram of a nuclear emergency make-up water facility. In an emergency of the cooling water system of the reactor, water is supplied from the condensate storage tank (CSP) 1 to the high pressure core injection system pump (HPCF pump) 2 and the reactor isolation cooling system pump (RCIC pump) 3. Is supplied with water.

The suppression boule purifying system pump (SPCU pump) 5 converts the water stored in the pressure suppression chamber (S / P) 6 into a desalination purifier (FPC) of a fuel pool cooling purifying system (FPC). / D) Send water to 10 for purification. The replenishment of the spent fuel storage pool 7 with water is performed by a desalination purification device (F / D) 10 by a fuel pool purification system pump (FPC) 9.
The water is sent through.

On the other hand, an equipment storage pit (DS pit) 8 for temporarily placing a dryer (D), a separator (S), and the like at the time of refueling is installed on the operating floor on the top floor of the nuclear reactor building. It is covered with stainless steel lining to fill with water.

In an emergency, water is injected from the condensate storage tank 1 to the reactor 4 via the high-pressure core injection system pump 2 and the reactor isolation cooling system pump 3. Further, the suppression pool purifying system pump 5 purifies the water stored in the pressure suppression chamber 6 and replenishes the spent fuel storage pool 7 with water.

As described above, in the conventional nuclear power plant, in addition to the pressure suppression chamber 6, the condensate storage for emergency use is used as a water source for the emergency high-pressure core injection system and the makeup water system for the spent fuel storage pool 7. A tank 1 and a tank (CST) are provided to store water.

[0008]

However, such a conventional emergency make-up water supply system for a nuclear reactor requires a dedicated condensate storage tank 1 and a tank. A large tank with a high seismic class is required. If this can be eliminated, the effect will be great from the viewpoint of reducing the construction cost of nuclear power plants and rationalizing the arrangement of equipment.

An object of the present invention is to provide an emergency make-up water facility for a nuclear power plant that can reduce the construction cost of a nuclear power plant.

[0010]

According to a first aspect of the present invention, there is provided a nuclear emergency make-up water facility in which water is previously supplied to an equipment storage pit provided on an operating floor of a reactor building, instead of a condensate storage tank. A suction pipe is provided to supply water from the equipment storage pit to the water injection pump in the event of an emergency, and the equipment is installed in the fuel pool cooling / purification pump that injects water into the spent fuel pool instead of the suppression pool purification system pump. A supply pipe for supplying water from the storage pit is provided.

In the emergency make-up water facility for a nuclear reactor according to the first aspect of the present invention, water is stored in advance in an equipment storage pit provided on the operating floor of the reactor building, and in an emergency, the water is replaced with a condensate storage tank. To supply water from the equipment storage pit to the water injection pump. Therefore, a condensate storage tank becomes unnecessary. Water is also supplied from the equipment storage pit to the fuel pool cooling / purifying pump that injects water into the spent fuel pool. Therefore, the suppression pool purifying system pump is not required, and the construction cost can be reduced.

In the nuclear emergency make-up water system according to the second aspect of the present invention, water is stored in advance in an equipment storage pit provided on the operating floor of a reactor building instead of the condensate storage tank, and the emergency water is stored in an emergency. A suction pipe for supplying water from the equipment storage pit to the water injection pump is provided.

In the emergency make-up water facility for a nuclear reactor according to the second aspect of the present invention, water is stored in advance in an equipment storage pit provided on the operating floor of the reactor building, and in an emergency, the water is replaced with a condensate storage tank. To supply water from the equipment storage pit to the water injection pump. Therefore, a condensate storage tank becomes unnecessary. On the other hand, when water is injected into the spent fuel pool, water is supplied to the spent fuel pool by a suppression pool purification system pump.

According to the third aspect of the present invention, in the emergency make-up water facility for a reactor, water is stored in advance in an equipment storage pit provided on the operating floor of the reactor building instead of the condensate storage tank. In some cases, a suction pipe is provided to supply water from the equipment storage pit to the water injection pump, and a supply pipe is provided to supply water from the equipment storage pit to the fuel pool cooling / purifying pump that injects water into the spent fuel pool. The pool purification system pump is configured to supply only purified water from the equipment storage pit to the pressure suppression chamber.

In the emergency make-up water facility for a nuclear reactor according to the third aspect of the present invention, water is stored in advance in an equipment storage pit provided on the operating floor of the reactor building, and in an emergency, the water is replaced with a condensate storage tank. To supply water from the equipment storage pit to the water injection pump. Therefore, a condensate storage tank becomes unnecessary. Water is also supplied from the equipment storage pit to the fuel pool cooling / purifying pump that injects water into the spent fuel pool. Therefore, piping from the suppression pool purification system pump to the spent fuel pool becomes unnecessary, and the construction cost can be reduced.

[0016]

Embodiments of the present invention will be described below. FIG. 1 is a system configuration diagram of a reactor emergency make-up water facility according to a first embodiment of the present invention.

The first embodiment differs from the conventional example shown in FIG. 4 in that an equipment storage pit 8 is used instead of the condensate storage tank 1.
And a suction pipe 11 for supplying water from the equipment storage pit 8 to the high-pressure core water injection system pump 2 and the reactor isolation cooling system pump 3 in an emergency, and a suppression pool purification system pump 5 is provided. Instead, a supply pipe 12 for supplying water from the equipment storage pit 8 to the fuel pool cooling / purifying pump 9 for injecting water into the spent fuel pool 7
Is provided.

That is, the condensate storage tank 1 is deleted, and the piping system for supplying water from the suppression pool purification system to the spent fuel storage pool 7 on the operating floor of the reactor building and the suppression pool purification system itself are deleted. The configuration is as follows.

In FIG. 1, water is supplied from the equipment storage pit 8 to the high-pressure core water injection system pump 2 and the reactor isolation cooling pump 3 via the suction pipe 11 and injected into the reactor 4. Although the suction pipes 11 to the pumps 2 and 3 are common pipes in FIG. 1, they may be provided independently. Also, the depth of the equipment storage pit 8 is set such that the water is stored below the lower end of the pool gate during normal operation to secure a necessary amount of water.

On the other hand, the spent fuel storage pool 7 on the operating floor of the reactor building is also supplied from the equipment storage pit 8 to the supply pipe 1.
Make up water via 2. That is, since the water source becomes the equipment storage pit 8 on the operation floor, the fuel pool cooling and purifying system pump 9 supplies water to the spent fuel storage pool 7. As a result, the suppression pool purification system can be eliminated, and further rationalization can be expected.

As described above, the suction pipe 1 is introduced into the high-pressure core water injection system pump 2 and the reactor isolation cooling system pump 3, which are emergency high-pressure water injection systems, from the bottom of the equipment storage pit 8 to the reactor 4.
1 and a supply pipe 12 is provided from the equipment storage pit 8 to the fuel pool cooling / purifying system pump 9. These pipes 11,
12 may be provided independently, or may be branched from the bottom of the equipment storage pit 8 by a single pipe as shown in FIG. Water is stored in the equipment storage pit 8 below the lower end of the pool gate and used as an emergency water source. The equipment storage pit 8 is large enough to secure the required amount of water.

When an emergency water source is used in the high-pressure core water injection system and the reactor isolation cooling system, conventionally, the first water source is the condensate storage tank 1 and the second water source is the pressure suppression chamber 6.
Therefore, the water in the equipment storage pit 8 is used as the first water source. Then, when the makeup water is transferred to the spent fuel storage pool 7, the water in the equipment storage pit 8 is transferred to the spent fuel storage pool 7 by the fuel cooling / purifying system pump 9.

As described above, according to the first embodiment, the suppression pool purification system can be eliminated, so that the arrangement of the reactor buildings can be rationalized and the construction cost can be reduced. The time for filling and draining the equipment storage pit 8 at the time of regular inspection can be reduced, and the amount of water used can be saved.

Next, a second embodiment of the present invention will be described. FIG. 2 is a system configuration diagram of a nuclear emergency make-up water facility according to a second embodiment of the present invention. This second embodiment is different from the conventional example shown in FIG. 4 in that water is stored in advance in an equipment storage pit 8 instead of the condensate storage tank 1, and the high-pressure core is removed from the equipment storage pit 8 in an emergency. A suction pipe 11 for supplying water to the water injection pump 2 and the cooling pump 3 at the time of reactor isolation is provided.

That is, the water source of the reactor emergency injection system is replaced by the condensate storage tank 1 with the equipment storage pit 8, so that the suppression pool purification system can be used without being deleted. In this case, the merits of rationalization are reduction of the emergency condensate storage tank 1 and rationalization of the arrangement.

Next, a third embodiment of the present invention will be described. FIG. 3 is a system configuration diagram of a reactor emergency make-up water facility according to a third embodiment of the present invention. This third embodiment is different from the conventional example shown in FIG. 4 in that water is stored in advance in an equipment storage pit 8 provided on the operating floor of a reactor building instead of the condensate storage tank 1. , Equipment storage pit 8 in case of emergency
Pipe 11 for supplying water to water injection pump 2 from
And a supply pipe 12 for supplying water from the equipment storage pit 8 to the fuel pool cooling / purifying pump 9 for injecting water into the spent fuel pool 7. The configuration is such that only purified water is supplied to the suppression chamber 6.

That is, while replacing the water source of the reactor emergency water injection system from the condensate storage tank 1 to the equipment storage pit 8,
The supply water supply pipe from the suppression pool purification system to the spent fuel pool 7 is deleted, and the suppression pool purification system for purifying the water in the pressure suppression chamber 6 is left. In this case, the merit of rationalization is the emergency condensate storage tank 1.
And the streamlining of the arrangement, and the cost of reducing the supply water supply piping to the spent fuel storage pool 7.

[0028]

As described above, according to the present invention, the construction cost of the emergency condensate storage tank can be reduced, so that the arrangement space of the reactor building can be reduced. In addition, the facility cost of the suppression pool purification system can be reduced, and the construction cost can be reduced by reducing the facility cost of the supply water supply pipe from the suppression pool purification system to the spent fuel pool.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a reactor emergency make-up water facility according to a first embodiment of the present invention.

FIG. 2 is a system configuration diagram of a reactor emergency make-up water facility according to a second embodiment of the present invention.

FIG. 3 is a system configuration diagram of a nuclear reactor emergency make-up water facility according to a third embodiment of the present invention.

FIG. 4 is a system configuration diagram of a conventional nuclear emergency make-up water facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condensate storage tank 2 High-pressure core water injection system pump 3 Reactor isolation cooling system pump 4 Reactor 5 Suppression pool purification system pump 6 Suppression chamber 7 Spent fuel storage pool 8 Equipment storage pit 9 Fuel pool cooling purification system pump 10 Desalination purification equipment 11 Suction pipe 12 Supply pipe

Claims (3)

[Claims] 1. A suppression pool purification system for supplying water from a condensate storage tank to a reactor by an injection pump in an emergency of a reactor cooling system and supplying purified water from the condensate storage tank to a pressure suppression chamber. In a nuclear reactor make-up water supply system in which water is supplied to a spent fuel pool by a pump, water is previously supplied to an equipment storage pit provided on an operation floor of a reactor building instead of the condensate storage tank. Fuel pool cooling for storing and storing a suction pipe for supplying water from the equipment storage pit to the water injection pump in an emergency, and injecting water into the spent fuel pool instead of the suppression pool purification system pump. An emergency make-up water facility for a nuclear reactor, wherein a supply pipe for supplying water from the equipment storage pit to a purification pump is provided. 2. A suppression pool purifying system for supplying water from a condensate storage tank to a reactor by an injection pump in an emergency of a reactor cooling system and supplying purified water from the condensate storage tank to a pressure suppression chamber. In a nuclear reactor make-up water supply system in which water is supplied to a spent fuel pool by a pump, water is previously supplied to an equipment storage pit provided on an operation floor of a reactor building instead of the condensate storage tank. An emergency make-up water facility for a nuclear reactor, wherein a suction pipe for storing water and supplying water from the equipment storage pit to the water injection pump in an emergency is provided. 3. A suppression pool purifying system for supplying water from a condensate storage tank to a reactor by an injection pump in an emergency of a reactor cooling system and supplying purified water from the condensate storage tank to a pressure suppression chamber. In a nuclear reactor make-up water supply system in which water is supplied to a spent fuel pool by a pump, water is previously supplied to an equipment storage pit provided on an operation floor of a reactor building instead of the condensate storage tank. A storage pipe is provided for supplying water from the equipment storage pit to the water injection pump in an emergency, and water is supplied from the equipment storage pit to a fuel pool cooling / purifying pump for injecting water into the spent fuel pool. A supply pipe for supplying the purified water, and the suppression pool purification system pump is configured to supply only purified water from the equipment storage pit to the pressure suppression chamber. Emergency make-up water equipment for the reactor.