JP2001091684A - Fuel pool cooling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten cooling capacity of a fuel pool according to a state exceeding a design base, such as shortening of periodic inspection, a long-term operation cycle, or the like. SOLUTION: In this equipment, one ends of a cooling water supply pipeline 19 and a cooling water return pipeline 20 are respectively connected to a secondary side nuclear reactor auxiliary cooling water pipeline 23 and a nuclear reactor auxiliary cooling water return pipeline 24 for a fuel pool cooling purification system heat exchanger 6 of a spent fuel pool 2, while the other ends of the cooling water supply pipeline 19 and the cooling water return pipeline 20 are respectively connected to a turbine auxiliary cooling water supply pipeline 21 and a return pipeline 22. Therefore, heat generated in the spent fuel pool 2 is removed by the cooling water supply pipeline 19 and the cooling water return pipeline 20 except a nuclear reactor auxiliary cooling system through the fuel pool cooling purification system heat exchanger 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fuel pool cooling system for removing decay heat generated from spent fuel in a boiling water nuclear power plant.

[0002]

2. Description of the Related Art A conventional example of a fuel pool cooling system installed in a boiling water nuclear power plant will be described with reference to FIG. In FIG. 14, reference numeral 1 denotes a reactor well, and a fuel pool 2 is installed adjacent to the reactor well 1 via a pool gate 17. During normal operation of the plant, fuel pool 2
The decay heat generated from the spent fuel stored in the fuel pool is taken away by the pool water in the fuel pool 2, that is, the cooling water, and the heated cooling water is removed from the skimmer surge tank 3 by a fuel pool cooling / purifying system pump (hereinafter, referred to as FPC). Through a pump 4, a fuel pool cooling / purifying system filtration and desalination device (hereinafter, FPC-
F / D) 5 to be purified, and then cooled (removed) by a fuel pool cooling / purifying heat exchanger (hereinafter referred to as FPC heat exchanger) 6, and the cooling water is returned to the fuel through a return pipe. Returned to pool 2.

Here, a heat removal system from the FPC heat exchanger 6 is a reactor auxiliary system cooling system pump (hereinafter, referred to as RCW pump).
The cooling water flowing from the cooling water 8 circulates in a reactor auxiliary cooling system heat exchanger (hereinafter referred to as an RCW heat exchanger) 9. Then, the seawater flows through the RCW heat exchanger 9 by the regular seawater pump 7 to take heat from the FPC heat exchanger 6 side, and finally discharge it to the sea to remove heat.

[0004] Further, during a periodic inspection of the plant (hereinafter, referred to as a regular inspection), when refueling, the pool gate 17 is opened, and the spent fuel existing between the reactor pressure vessel 18, the reactor well 1 and the fuel pool 2 is opened. Further, the fuel in use is cooled by the fuel pool cooling purification system and the residual heat removal system.

[0005] Regarding the cooling method, the fuel pool cooling and purification system is performed in the same manner as during normal operation of the plant, and the residual heat removal system is supplied from a reactor pressure vessel 18 to a residual heat removal system pump (hereinafter referred to as an RHR pump) 13. After flowing into a residual heat removal type heat exchanger (hereinafter, referred to as an RHR heat exchanger) 12 for cooling, it is returned to the reactor pressure vessel 18 again. Here, the heat removal system from the RHR heat exchanger 12 is a cooling system using a residual heat removal system seawater pump (hereinafter referred to as RHRS pump) 11, and is finally discharged to the sea to remove heat.

In the case of regular inspection in which all the fuel in the reactor pressure vessel 18 is moved to the fuel pool 2, the residual heat removal system also takes water from the skimmer surge tank 3, and after cooling, moves to the fuel pool 2. It can be returned.

The regular seawater pump 7 is connected to a secondary supply pipe of a turbine auxiliary cooling system heat exchanger (hereinafter referred to as a TCW heat exchanger) 14, that is, a pipe on the side where seawater flows, and a TCW
The primary side of the heat exchanger 14, that is, the side that exchanges heat with the secondary side is a turbine auxiliary cooling system pump (hereinafter, referred to as a TCW pump).
15, the load of the turbine auxiliary cooling system (hereinafter TCW)
The return heat of the TCW load 16 is released to the sea via the secondary pipe of the TCW heat exchanger 14.

[0008]

[Problems to be solved by the invention] As the current operation,
Although no particular problem has occurred with regard to cooling of the fuel pool 2, if short-term inspection and long-term operation cycle of the power plant or introduction of MOX fuel as a pluthermal plan were mentioned, none of these would be required for cooling the fuel pool. From a viewpoint, it is a severe direction that exceeds the design conditions.

More specifically, the regular inspection is shortened because the pool gate 17 between the fuel pool 2 and the reactor well 1 after fuel exchange is closed earlier, so that the fuel pool 2 is cooled by the fuel pool cooling equipment alone. While the time to perform the heat treatment is earlier, the shorter the cooling period after irradiation, the larger the decay heat. Therefore, the decay heat to be removed tends to increase.

In the long-term operation cycle, the number of fuels taken out per one time increases, and the decay heat of the spent fuel immediately after being taken out of the reactor pressure vessel 18 is larger than that of the spent fuel cooled in the fuel pool 2. Therefore, the decay heat that must be removed by the fuel pool cooling equipment tends to increase.

Furthermore, the MOX fuel tends to increase the decay heat per unit number more than the uranium fuel. Regarding the power increase, the decay heat of the spent fuel after being taken out increases in accordance with the increase in the core thermal output, so that the heat load that must be removed by the fuel pool cooling equipment tends to increase.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Even when the heat load of the fuel pool exceeds the capacity of the fuel pool cooling and purifying system due to a shortened regular inspection or a long operation cycle, the heat removal is performed. It is an object of the present invention to provide a fuel pool cooling system capable of coping with an increase in load and easily removing decay heat released from spent fuel in a fuel pool.

[0013]

According to a first aspect of the present invention, a fuel pool cooling / purifying system heat exchanger connected to a fuel pool and a secondary cooling water pipe of the fuel pool cooling / purifying system heat exchanger are connected. It is characterized by comprising a reactor auxiliary equipment cooling system, and a cooling water pipe other than the reactor auxiliary equipment cooling system branched and connected to the secondary side cooling water pipe.

A second aspect of the present invention is characterized in that the cooling water piping other than the reactor auxiliary equipment cooling system comprises a turbine auxiliary equipment cooling water system using seawater as a cooling source. The invention of claim 3 is
The cooling water piping other than the reactor accessory cooling system is characterized by comprising a cooling water system using a turbine accessory cooling water system as a cooling source.

A fourth aspect of the present invention is characterized in that the cooling water piping other than the reactor auxiliary equipment cooling system comprises a cold water system using the reactor auxiliary equipment cooling system as a cooling source. The invention of claim 5 is
The cooling water piping other than the reactor auxiliary cooling system is characterized by comprising a cooling water system by an air cooler using the atmosphere as a cooling source.

A sixth aspect of the present invention is characterized in that the cooling water piping other than the cooling system for the auxiliary reactors comprises a cooling water system using the atmosphere as a cooling source. The invention according to claim 7 is characterized in that the cooling water piping other than the reactor auxiliary cooling system is formed of a seawater system.

The invention according to claim 8 is characterized in that the cooling water pipes other than the cooling system for the reactor auxiliary equipment are formed of a seawater system for removing residual heat. According to a ninth aspect of the present invention, a cooling system other than the conventional fuel pool cooling and purifying system is installed as a fuel pool cooling system for the spent fuel pool, and the other cooling system includes a turbine auxiliary cooling water system and a reactor auxiliary cooling system. It is characterized by comprising at least one system selected from a machine cooling system, a residual heat removal seawater system, a chilled water system, or a cooling water system using an air cooler using the atmosphere as a cooling source. The invention according to claim 10 is characterized in that a bypass pipe is connected to an inlet / outlet side of the fuel pool cooling / purifying system filtration and desalination apparatus via a switching valve.

[0018] The invention corresponding to claims 1 to 8 is a conventional FP installed when a heat load higher than the cooling capacity of the current fuel pool cooling and purifying system has to be removed due to shortened regular inspection.
The cooling capacity of the fuel pool can be improved by supplying cooling water lower than the cooling water temperature of the reactor auxiliary equipment using a heat removal path separate from the conventionally installed heat removal path using the C heat exchanger. it can.

In the invention corresponding to claims 2 to 7,
Cooling the turbine accessory cooling system, the chilled water system with the turbine accessory cooling system as the cooling source, the chilled water system with the reactor accessory cooling system as the cooling source, the air-cooled air cooler, and the air cooler as the heat removal path. The problem can be solved by the cold water system, seawater system, and residual heat removal seawater system as the source.

The invention corresponding to claim 9 is a cooling system installed separately from the conventional FPC system when it is necessary to remove a heat load higher than the cooling capacity of the conventional fuel pool cooling and purification system due to shortened regular inspection. Depending on the system, cooling of the fuel pool can be enabled. Further, the fuel pool can be cooled in combination with the conventional FPC system.

As a heat removal path corresponding to the ninth aspect, the problem is solved by a turbine accessory cooling system, a reactor accessory cooling system, a residual heat removal seawater system, a chilled water system, and an air-cooled air cooler. it can.

[0022] The invention corresponding to claim 10 can be used even in the event that the filtration and desalination apparatus cannot be used due to an earthquake or the like.
When it is necessary to remove the heat load over the cooling capacity of the conventionally installed fuel pool cooling and purification system by shortening the regular inspection, etc., for the bypass piping installed in the filtration and desalination equipment to enable continuous cooling. In this case, the cooling capacity of the FPC system can be improved, and as a result, the cooling capacity of the fuel pool can be improved in combination with the facilities described in the other claims.

[0023]

(First Embodiment) A first embodiment of a fuel pool cooling system according to the first and second aspects of the present invention will be described with reference to FIG.

In FIG. 1, the same portions as those in FIG. 14 are denoted by the same reference numerals, and the description of the overlapping portions will be omitted. The present embodiment is different from the conventional example in that a cooling water supply pipe 19 for connecting a turbine auxiliary equipment cooling water supply pipe 21 and a reactor auxiliary equipment cooling water supply pipe 23 by a TCW pump 15 and a reactor auxiliary equipment cooling Water return piping
A cooling water return pipe 20 for connecting the cooling water return pipe 22 to the turbine auxiliary cooling water return pipe 22 is provided, and a switching valve 25 is provided for each of the cooling water supply pipe 19 and the cooling water return pipe 20.

Next, the operation of the first embodiment will be described.
During normal operation, the fuel pool 2 is cooled by the FPC pump 4 by circulating fuel pool water through the FPC heat exchanger 6.
RCW cooling water circulated by CW pump 8
Seawater is cooled by the regular seawater pump 7 through the heat exchanger 9.

By shortening the regular inspection and lengthening the operation cycle,
If a heat load in the fuel pool 2 that is not taken into account during the regular inspection is taken into consideration in the fuel pool 2, the switching of the cooling water to the FPC heat exchanger 6 is performed by the switching valve 25.
Cooling is performed by cooling the fuel pool water circulated by the FPC pump 4 through the FPC heat exchanger 6 and the turbine accessory cooling water circulated by the TCW pump 15 through the TCW heat exchanger 14 by the regular seawater pump 7 to remove seawater. The fuel pool can be cooled by the improvement of the fuel pool.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pluthermal plan. Can be done without.

(Second Embodiment) Referring to FIG.
A second embodiment of the fuel pool cooling equipment according to the present invention will be described.

In this embodiment, the primary inlet of the refrigerator 26 is connected to the turbine auxiliary cooling water supply pipe 21 by the TCW pump 15, and the primary outlet of the refrigerator 26 is connected to the turbine auxiliary cooling water return pipe 22. I do. Cooling water supply piping on the secondary side of the refrigerator 26
19 and the cooling water return pipe 20 are connected. The cooling water pump 27 is connected to the cooling water return pipe 20. The outlet side of the cooling water supply pipe 19 is connected to the reactor auxiliary equipment cooling water supply pipe 23 via a switching valve 25. The inlet side of the cooling water return pipe 20 is connected to the FPC heat exchanger 6 via the switching valve 25.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and lengthening the operation cycle,
If a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the switching valve 25 switches the cooling water to the FPC heat exchanger 6 so that the fuel pool 2 is switched.
Cooling is performed by cooling the fuel pool water circulated by the FPC pump 4 through the FPC heat exchanger 6, chilled water circulated by the chilled water pump 27, passing through the refrigerator 26, passing through the turbine auxiliary cooling system, cooling the seawater by the regular seawater pump 7, and removing heat. The cooling of the fuel pool can be performed by improving the capacity.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for the shortening of the regular inspection and the introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Third Embodiment) Referring to FIG.
A third embodiment of the fuel pool cooling system according to the present invention will be described.

In this embodiment, a primary coolant inlet of a refrigerator 26 is connected to a cooling water supply pipe 23 for the auxiliary equipment of the reactor by the RCW pump 8, and a primary outlet of the cooling equipment is connected to a cooling water return pipe 24 of the auxiliary equipment for the reactor.
Connect to A cooling water supply pipe 19 and a cooling water return pipe 20 are connected to the secondary side of the refrigerator 26. The cooling water pump 27 is connected to the cooling water return pipe 20.

A cooling water supply pipe 19 connected to the cooling water supply pipe 23 for the auxiliary equipment by the cold water pump 27, a cooling water return pipe 20 connected to the cooling water pump 27 branched from the cooling water return pipe 24 for the auxiliary equipment cooling water, and The switching valve 25 is provided.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
If a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the switching valve 25 switches the cooling water to the FPC heat exchanger 6 so that the fuel pool 2 is switched.
Cooling is performed by cooling the fuel pool water circulated by the FPC pump 4 through the FPC heat exchanger 6, chilled water circulated by the chilled water pump 27, through the refrigerator 26, through the auxiliary cooling system of the reactor, by the common seawater pump 7 and cooling the seawater. The cooling of the fuel pool can be performed by improving the heat capacity.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pluthermal plan. Can be done without.

(Fourth Embodiment) Referring to FIG.
A fourth embodiment of the fuel pool cooling equipment according to the present invention will be described.

In the present embodiment, a cooling water supply pipe 23 for the auxiliary reactor of the reactor connected as a secondary cooling water pipe of the FPC heat exchanger 6 is used.
Similarly, the cooling water supply pipe 19 and the cooling water return pipe 20 are connected to the return pipe 24, and the cooling water supply pipe 19 is connected to the first cooling water supply pipe 19.
Pump 28 and the first pump 28 and cooling water return piping
20 is connected to an air cooler 29, and a switching valve 25 is provided for each pipe.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and lengthening the operation cycle,
When a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the cooling water is switched to the FPC heat exchanger 6 by the switching valve 25 so that the fuel pool 2 Cooling uses circulating water circulated by pump 28 as an air cooler.
Air cooling is performed through 29, and cooling of the fuel pool can be performed by improving the heat removal capacity.

According to the present embodiment, the cooling of the fuel pool is a problem even in a situation beyond the design base, that is, in the shortening of the periodic inspection and the introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Fifth Embodiment) Referring to FIG.
A fifth embodiment of the fuel pool cooling equipment according to the present invention will be described.

In the present embodiment, a cooling water supply pipe 23 for an auxiliary reactor of a reactor connected as a secondary cooling water pipe of the FPC heat exchanger 6 is used.
Similarly, the cooling water supply pipe 19 and the cooling water return pipe 20 are connected to the return pipe 24, and the cooling water pump 27 is connected to the cooling water return pipe 20, and the cooling water pump 27 and the cooling water supply pipe 19 are frozen. That is, the air cooling equipment 30 is connected to the refrigerator 26, and the switching valve 25 is provided in each pipe.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
When a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the cooling water is switched to the FPC heat exchanger 6 by the switching valve 25 so that the fuel pool 2 For cooling, the chilled water circulated by the chilled water pump 27 through the FPC heat exchanger 6 is cooled through the refrigerator 26, and the refrigerator 26 cools the atmosphere by the air cooling equipment 30, and cools the fuel pool 2 by improving the heat removal capacity. be able to.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Sixth Embodiment) Referring to FIG.
A sixth embodiment of the fuel pool cooling system according to the present invention will be described.

In the present embodiment, the cooling water supply pipe 23 for the auxiliary reactor of the reactor connected as the secondary cooling water pipe of the FPC heat exchanger 6 is used.
Similarly, the cooling water supply pipe 19 and the cooling water return pipe 20 are connected to the return pipe 24, the cooling water supply pipe 19 is connected to the seawater pump 31, and the cooling water return pipe 20 is connected to the water discharge passage 38. ,
That is, a switching valve 25 is provided for each pipe.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and lengthening the operation cycle,
When a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the cooling water is switched to the FPC heat exchanger 6 by the switching valve 25 so that the fuel pool 2 For cooling, the fuel pool water circulated by the FPC pump 4 is cooled by seawater by the seawater pump 31 through the FPC heat exchanger 6, and the fuel pool 2 can be cooled by improving the heat removal capability. The cooling water from the cooling water return pipe 20 is discharged to the water discharge channel 38.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Seventh Embodiment) Referring to FIG.
A seventh embodiment of a fuel pool cooling system according to the present invention will be described.

This embodiment is different from the sixth embodiment shown in FIG. 6 in that a seawater pump 31 connected to the cooling water supply pipe 19 is replaced by a seawater pump 11 for removing residual heat. Other parts are the same as in the sixth embodiment.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
When a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the cooling water is switched to the FPC heat exchanger 6 by the switching valve 25 so that the fuel pool 2 For cooling, the fuel pool water circulated by the FPC pump 4 is passed through the FPC heat exchanger 6 to remove the residual heat from the seawater pump 11.
Thus, the seawater is cooled, and the fuel pool 2 can be cooled by improving the heat removal capacity.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, in the shortening of regular inspection and the introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Eighth Embodiment) Referring to FIG.
An eighth embodiment of the fuel pool cooling equipment according to the present invention will be described.

In this embodiment, the skimmer surge tank 3 and the F
A fuel pool water supply pipe 33 is connected to a fuel pool water supply pipe 33 via a valve 35, and a fuel pool water return pipe 34 is connected to the fuel pool 2 via a valve 35. The first pump 28 is connected to 33, and the first pump 28
The fuel pool water return pipe 34 is connected to the primary side of the heat exchanger 32, the cooling water supply pipe 19 and the cooling water return pipe 20 are connected to the secondary side of the heat exchanger 32, and the cooling water supply pipe 19 is connected to the turbine. That is, it is connected to the auxiliary equipment cooling water supply pipe 21 and the cooling water return pipe 20 is connected to the turbine auxiliary equipment cooling water return pipe 22.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
If a heat load in the fuel pool 2 that is not considered in the design during the regular inspection occurs, the heat in the fuel pool 2 is removed by the valve auxiliary cooling system in addition to the conventional FPC system by the valve 35. The seawater is cooled through the heat exchanger 32 and the TCW heat exchanger 14, and the cooling of the fuel pool can be performed by improving the total heat removal capability.

According to the present embodiment, the cooling of the fuel pool is problematic even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Ninth Embodiment) Referring to FIG.
A ninth embodiment of a fuel pool cooling system according to the present invention will be described.

This embodiment is different from the eighth embodiment shown in FIG. 8 in that a cooling water supply pipe 19 connected to a heat exchanger 32 is provided.
Is connected to the reactor auxiliary equipment cooling water supply pipe 23, and the other end of the cooling return pipe 20 connected to the heat exchanger 32 is connected to the reactor auxiliary equipment cooling water return pipe 24. The other parts are the same as in the eighth embodiment, and the other description is omitted.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
If a heat load in the fuel pool 2 that is not taken into consideration in design during the regular inspection occurs, the reactor 35 is supplied to the reactor through the newly installed heat exchanger 32 in addition to the conventional FPC system by the valve 35. Heat removal from the fuel pool 2 by the heat exchanger 32, heat exchanger 32, RC
Seawater cooling is performed through the W heat exchanger 9, and cooling of the fuel pool can be performed by improving the total heat removal capability.

According to the present embodiment, cooling of the fuel pool is a problem even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Tenth Embodiment) Referring to FIG.
A tenth embodiment of a fuel pool cooling system according to the present invention will be described.

This embodiment is different from the eighth embodiment shown in FIG. 8 in that a cooling water supply pipe connected to a heat exchanger 32 is provided.
The other end of 19 is connected to the residual heat removal seawater pump 11 and the other end of the cooling water return pipe 20 connected to the heat exchanger 32 is connected to the water discharge passage 38. The other parts are the same as in the eighth embodiment, and the description of the overlapping parts will be omitted.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
If a heat load in the fuel pool 2 that is not considered in the design during the regular inspection occurs, the residual heat removal seawater system is passed through the newly installed heat exchanger 32 in addition to the conventional FPC system by the valve 35. The heat removal in the fuel pool 2 is performed by the seawater cooling through the heat exchanger 32, and the cooling of the fuel pool can be performed by improving the total heat removal capability.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for shortening of regular inspection and introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Eleventh Embodiment) Referring to FIG.
An eleventh embodiment of the fuel pool cooling equipment according to the present invention will be described.

This embodiment is different from the eighth embodiment shown in FIG. 8 in that a cooling water supply pipe 19 connected to a heat exchanger 32 is provided.
Is connected to the discharge side of the chilled water pump 27,
Is connected to the output side of the refrigerator 26, and the other end of the cooling water return pipe 20 connected to the heat exchanger 32 is connected to the input side of the refrigerator 26. The other parts are the same as in the eighth embodiment, and the description of the overlapping parts will be omitted.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

To shorten the regular inspection and lengthen the operation cycle.
If a heat load in the fuel pool 2 that is not considered in the design during the regular inspection occurs, the fuel pool by the chilled water system is passed through the newly installed heat exchanger 32 in addition to the conventional FPC system by the valve 35. The heat removal in 2 is performed using the heat exchanger 32. The heat exchanger 32 is cooled by cold water supplied from the refrigerator 26 to the cold water pump 27. The cooling of the chilled water system is performed by a cooling system for a nuclear reactor auxiliary equipment or a cooling system for a turbine auxiliary equipment, an air cooler, or the like, and the cooling of the fuel pool can be performed by improving the total heat removal capability.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, in the shortening of the periodic inspection and the introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Twelfth Embodiment) Referring to FIG.
A twelfth embodiment of the fuel pool cooling equipment according to the present invention will be described.

This embodiment is different from the eighth embodiment shown in FIG. 8 in that a cooling water supply pipe 19 connected to a heat exchanger 32 is provided.
Is connected to the discharge side of the second pump 36, the suction side of the second pump 36 is connected to the output side of the air cooler 29, and the other end of the cooling water return pipe 20 connected to the heat exchanger 32. Air cooler at the end 29
Connected to the input side of The other parts are the same as in the eighth embodiment, and the description of the overlapping parts will be omitted.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
If a heat load in the fuel pool 2 that is not considered in the design during the regular inspection occurs, the air cooler is provided by the valve 35 through the newly installed heat exchanger 32 in addition to the conventional FPC system.
The heat removal in the fuel pool 2 by 29 is performed using the heat exchanger 32. The cooling of the air cooler 29 is performed by the atmosphere, and the cooling of the fuel pool can be performed by improving the total heat removal capability.

According to the present embodiment, the cooling of the fuel pool is a problem even in situations beyond the design base, that is, for the shortening of the periodic inspection and the introduction of MOX fuel as a long-term operation cycle of the power plant or as a pull thermal plan. Can be done without.

(Thirteenth Embodiment) According to FIG.
A thirteenth embodiment of the fuel pool cooling equipment according to the present invention will be described.

This embodiment is different from the conventional example shown in FIG. 14 in that a bypass pipe 37 is provided at the inlet and outlet pipes of the FPC-F / D 5 as shown in FIG.
And a switching valve 25 is provided for each of the inlet side piping. The other parts are the same as in FIG. 14, and the description of the overlapping parts is omitted.

Next, the operation will be described. During normal operation, the fuel pool 2 is cooled by the FPC pump 4 through the FPC heat exchanger 6 and the reactor auxiliary equipment cooling water circulated by the RCW pump 8 by the RCW heat exchanger 9 by the regular seawater pump 7. Perform seawater cooling.

By shortening the regular inspection and prolonging the operation cycle,
If a thermal load in the fuel pool 2 that was not taken into account during the regular inspection was taken into consideration, the valve 25 was used to operate the conventional FPC system only during an emergency such as an earthquake or when draining wells. The FPC-
By temporarily stopping the purification by the F / D 5 or restricting the flow rate, the system flow rate is increased by reducing the system resistance in the fuel pool cooling system, and as a result, the cooling water flow rate of the FPC heat exchanger 6 is increased. Thereby, the cooling capacity of the existing FPC heat exchanger 6 is improved.

According to the present embodiment, depending on the situation that exceeds the design base, that is, the shortening of the regular inspection and the introduction of MOX fuel as a long-term operation cycle of the power plant or the pluthermal plan, only the present embodiment is used depending on the situation. Alternatively, the fuel pool can be cooled without any problem in combination with the other embodiments.

In the first embodiment, the same effect can be obtained by using a seawater pump for emergency diesel power generation equipment, a turbine auxiliary equipment cooling seawater pump, or a nuclear reactor auxiliary equipment cooling seawater pump as a cooling source. Similar effects can be obtained by using a service seawater pump or a seawater pump for emergency diesel power generation equipment, a turbine accessory cooling seawater pump, or a nuclear reactor accessory cooling seawater pump as the cooling system in the portion relating to the ninth embodiment. can get. In the first embodiment, 2
A similar effect can be obtained by cooling one of the installed FPC heat exchangers with the cooling system of the nuclear reactor auxiliary equipment while cooling the other with the cooling system of the refrigerator or turbine auxiliary equipment.

[0090]

According to the present invention, the state beyond the design base, that is, the shortened regular inspection and the long-term operation cycle of the power plant,
Alternatively, it is possible to provide a fuel pool cooling facility capable of cooling the fuel pool without any problem in response to the introduction of MOX fuel as a pluthermal plan and further increase in output.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a first embodiment of a fuel pool cooling system according to the present invention.

FIG. 2 is a piping diagram showing a second embodiment of the fuel pool cooling system according to the present invention.

FIG. 3 is a piping system diagram showing a third embodiment of the fuel pool cooling system according to the present invention.

FIG. 4 is a piping diagram showing a fourth embodiment of the fuel pool cooling system according to the present invention.

FIG. 5 is a piping diagram showing a fifth embodiment of the fuel pool cooling system according to the present invention.

FIG. 6 is a piping system diagram showing a sixth embodiment of the fuel pool cooling system according to the present invention.

FIG. 7 is a piping diagram showing a seventh embodiment of the fuel pool cooling system according to the present invention.

FIG. 8 is a piping diagram showing an eighth embodiment of the fuel pool cooling system according to the present invention.

FIG. 9 is a piping diagram showing a ninth embodiment of a fuel pool cooling system according to the present invention.

FIG. 10 is a piping diagram showing a fuel pool cooling system according to a tenth embodiment of the present invention.

FIG. 11 is a piping system diagram showing an eleventh embodiment of a fuel pool cooling system according to the present invention.

FIG. 12 is a piping diagram showing a twelfth embodiment of a fuel pool cooling system according to the present invention.

FIG. 13 is a piping diagram showing a thirteenth embodiment of a fuel pool cooling system according to the present invention.

FIG. 14 is a piping diagram showing a conventional fuel pool cooling system.

[Description of Signs] 1 ... Reactor well, 2 ... Fuel pool, 3 ... Skim surge tank, 4 ... Fuel pool cooling purification pump (FPC pump), 5 ... Fuel pool cooling purification system filtration and desalination apparatus (FPC)
-F / D), 6 ... Fuel pool cooling / purifying heat exchanger (FP)
C heat exchanger), 7 ... regular seawater pump (SW pump), 8
... Reactor accessory cooling system pump (RCW pump), 9 ... Reactor accessory cooling system heat exchanger (RCW heat exchanger), 10 ... Other heat load, 11 ... Residual heat removal seawater pump (RHRS pump) , 12 ... heat exchanger for removing residual heat (RHR heat exchanger),
13: Residual heat removal system pump (RHR pump), 14: Turbine accessory cooling system heat exchanger (TCW heat exchanger), 15: Turbine accessory cooling system pump (TCW pump), 16: Turbine accessory cooling system Load (TCW load), 17… Pool gate,
18… Reactor pressure vessel (RPV), 19… Cooling water supply pipe,
20… Cooling water return pipe, 21… Turbine auxiliary equipment cooling water supply pipe, 22… Turbine auxiliary equipment cooling water supply pipe, 23… Reactor auxiliary equipment cooling water supply pipe, 24… Reactor auxiliary equipment cooling water return pipe, 25 …
Switching valve, 26 ... Refrigerator, 27 ... Cold water pump, 28 ... First pump, 29 ... Air cooler, 30 ... Air cooling equipment, 31 ... Seawater pump, 32 ... Heat exchanger, 33 ... Fuel pool water supply pipe , 34 ...
Fuel pool water return piping, 35 ... valve, 36 ... second pump, 37
... bypass line for filtration and desalination equipment, 38 ... discharge channel.

Claims (10)

[Claims] 1. A fuel pool cooling / purifying system heat exchanger connected to a fuel pool, a reactor auxiliary cooling system connected to a secondary cooling water pipe of the fuel pool cooling / purifying system heat exchanger, And a cooling water pipe other than the reactor auxiliary equipment cooling system branched and connected to the side cooling water pipe. 2. The fuel pool cooling system according to claim 1, wherein a cooling water pipe other than the reactor auxiliary cooling system comprises a turbine auxiliary cooling water system using seawater as a cooling source. 3. The fuel pool cooling system according to claim 1, wherein the cooling water piping other than the reactor accessory cooling system comprises a cooling water system using a turbine accessory cooling water system as a cooling source. 4. The fuel pool cooling system according to claim 1, wherein the cooling water piping other than the reactor accessory cooling system comprises a cooling water system using the reactor accessory cooling system as a cooling source. 5. The fuel pool cooling system according to claim 1, wherein the cooling water piping other than the reactor auxiliary cooling system comprises a cooling water system using an air cooler using the atmosphere as a cooling source. 6. The fuel pool cooling system according to claim 1, wherein the cooling water piping other than the reactor auxiliary cooling system is formed of a cooling water system using the atmosphere as a cooling source. 7. A fuel pool cooling system, wherein a cooling water pipe other than the reactor auxiliary equipment cooling system is formed of a seawater system. 8. The fuel pool cooling system according to claim 1, wherein the cooling water piping other than the reactor auxiliary equipment cooling system comprises a residual heat removal seawater system. 9. A cooling system for cooling a spent fuel pool, which is different from a conventional cooling system for cooling and cooling a fuel pool, wherein the other cooling system is a turbine auxiliary cooling water system,
A fuel pool cooling system comprising at least one system selected from a reactor auxiliary system cooling system, a residual heat removal seawater system, a chilled water system, and a cooling water system using an air cooler using the atmosphere as a cooling source. 10. The fuel pool cooling system according to claim 1, wherein a bypass pipe is connected to an inlet / outlet side of the fuel pool cooling / purifying system filtration and desalination apparatus via a switching valve.