JP2003167089A - Nuclear energy facility internal cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nuclear energy facility internal cooling system for enabling efficient operation in consideration of fluctuation of thermal load in a fuel pool. <P>SOLUTION: This nuclear energy facility internal cooling system has a fuel pool cooling and purifying heat exchanger 5 connected to the fuel pool 1 installed adjacent to a reactor to cool water in the fuel pool, a reactor auxiliary machine cooling system 7 for guiding secondary side cooling water heat- exchanged by a fuel pool cooling and purifying system heat exchanger by a secondary side cooling water pipe and discharging the heat of the secondary side cooling water to the outside, and a refrigerator 11 connected to branch off the secondary side cooling water pipe. The system has an ice heat storage tank 14 capable of at least temporarily supplying cold water to the secondary cooling water pipe. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system in a nuclear facility for removing heat of fuel decay of a core or a spent fuel pool generated when a nuclear reactor is shut down and heat generated from other equipment in a nuclear power plant. .

[0002]

2. Description of the Related Art A conventional cooling system in a nuclear facility for cooling a fuel pool and the like when a nuclear reactor is shut down in a boiling water nuclear power plant will be described with reference to FIG. 7 (Japanese Patent Laid-Open No. 2001-074874, 2001-09
1684, Japanese Patent Laid-Open No. 2001-188094).

A fuel pool 1 is installed adjacent to the reactor well via a pool gate. During the normal operation of the plant, decay heat generated from the spent fuel stored in the fuel pool 1 is exhausted to pool water in the fuel pool 1. The heated fuel pool water flows out to the skimmer surge tank 2, flows into the fuel pool cooling / purification system (FPC) pump 3 into the fuel pool cooling / purification system filter desalting device 4, and is purified, and then the fuel pool cooling / purification system. The heat is removed by the heat exchanger 5. Return pipe 1 of this heat-cooled pool water
It is returned to the fuel pool 1 again through a.

Here, the heat exchanger 5 for the fuel pool cooling purification system
Exhaust heat from the reactor auxiliary cooling water system (RCW) pump 6 is circulated in the reactor auxiliary cooling water system heat exchanger 7 by cooling water circulated by the reactor auxiliary cooling water system (RCW) pump 6. The seawater cooling system (RSW) pump 8 allows the seawater to pass through the reactor auxiliary equipment cooling water system heat exchanger 7 to remove the heat and finally release it to the sea for heat removal.

Further, during the periodical inspection (fixed inspection) of the plant, since the pool gate is opened at the time of refueling, the fuel in use in the reactor pressure vessel and the spent fuel existing in the fuel pool 1 are simultaneously collected in the fuel pool. It is cooled by a cooling purification system.

The cooling method during regular inspection is the same as that during normal operation, but there are some plants that take seawater from only one intake port for seawater cooling systems. In that case, it is necessary to stop all the seawater cooling system pumps. If the seawater cooling system pump 8 is stopped, heat cannot be removed from the reactor auxiliary cooling water system heat exchanger 7, and as a result, spent fuel cannot be cooled in the fuel pool cooling / purification system. Therefore, at the time of inspection of the seawater cooling system, the valve 9 on the exhaust heat side reactor auxiliary cooling water system piping is closed so that heat can be removed by the fuel pool cooling purification system heat exchanger 5.
The valve 19 is opened to switch to the refrigerator cooling system connected to the reactor auxiliary cooling water system, and the refrigerator pump 10 passes water to the refrigerator 11 to remove heat.

A dry well (D / W) cooler 44 is provided as a supply destination of the reactor auxiliary cooling water system. During the reactor operation, the air in the drywell 32 is cooled by the five drywell coolers 4 installed in the drywell 32.
It is done by 4. Four of the five drywell coolers 44 have reactor auxiliary equipment cooling water system cooling water (about 35 ° C.) and one have drywell dehumidification system cooling water or ventilation air conditioning auxiliary equipment permanent cooling water system (HVCW) (10 (About .degree. C.) is passed, and the air in the dry well 32 is cooled by heat exchange between the passed coil and the air in the dry well 32.

[0008]

The decay heat from the spent fuel and the newly extracted fuel decreases with the passage of time after the reactor shutdown. Since the refrigerator 11 is designed with the ability to remove the maximum decay heat released to the fuel pool of the spent fuel and the newly taken out fuel, when the decay heat is reduced, the refrigerator is operated at a low load. That means
ineffective.

Further, the temperature of the cold water returning to the refrigerator 11 greatly changes with the change of the decay heat, so that the operating conditions of the refrigerator 11 are very severe.
In addition, the refrigerator 11 is operated for a limited period only during the inspection of the seawater cooling system during the plant regular inspection.
The equipment utilization rate is poor. Further, when the air-cooling method is used for the refrigerator 11, it is necessary to take anti-freezing measures when it is not used in winter.

Further, with regard to the drywell cooler 44, in many plants, the temperature inside the drywell 32 during operation of the reactor is higher than that at the time of construction due to peeling of the heat insulating material and the like. Need to lower.

The present invention solves at least a part of the above-mentioned various problems, and provides a cooling system in a nuclear facility capable of efficient operation in consideration of fluctuations in heat load in a fuel pool. With the goal.

[0012]

The present invention achieves the above object, and the invention according to claim 1 is connected to a fuel pool installed adjacent to a nuclear reactor and is connected to the inside of the fuel pool. And a fuel pool cooling / purifying system heat exchanger for cooling the water of the secondary cooling water, and the secondary side cooling water that has exchanged heat with the fuel pool cooling / purifying system heat exchanger is guided by a secondary side cooling water pipe. Cooling in a nuclear facility having a nuclear reactor auxiliary equipment cooling system for releasing heat to the outside, and a refrigerator branched from the secondary side cooling water pipe and connected to supply cold water to the secondary side cooling water pipe The system is characterized by having a cold heat storage tank capable of storing cold heat and at least temporarily supplying cold water to the secondary side cooling water pipe.

According to the invention of claim 1, the cold heat is stored in the cold heat storage tank when the heat load in the fuel pool is small, and the cold heat stored in the cold heat storage tank is used when the heat load in the fuel pool is large. can do. For example,
When inspecting the seawater cooling system from the time when the decay heat was high immediately after the reactor shutdown, when the decay heat was high, the cooling system using the refrigerator and the cooling system using the cold heat storage tank were operated and the decay heat became low. It is possible to switch to operation of only the cooling system using the refrigerator at the time. Therefore, the capacity of the refrigerator can be made smaller than that of the conventional one, and efficient operation can be performed.

The invention according to claim 2 is a heat exchanger for cooling and purifying a fuel pool, which is connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and the fuel. Pool cooling purification system Reactor auxiliary equipment cooling system that guides secondary side cooling water that has undergone heat exchange in a heat exchanger through a secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside, and the fuel pool A refrigerator for cooling the water in the fuel pool connected to a cooling system in a nuclear facility,
It has a cold heat storage tank capable of storing cold heat and at least temporarily supplying cold water directly to the fuel pool without passing through a heat exchanger.

According to the second aspect of the present invention, the fuel pool water can be directly cooled without passing through the fuel pool cooling / purification system heat exchanger and the reactor auxiliary equipment cooling system heat exchanger. Can be cooled. Further, by using the cold heat storage tank, the capacity of the refrigerator can be reduced.

The invention according to claim 3 is a heat exchanger for cooling and purifying a fuel pool, which is connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and the fuel. A secondary cooling system for the reactor cooling system that guides the secondary cooling water that has undergone heat exchange in the pool cooling and purification system heat exchanger through the secondary cooling water pipe to release the heat of the secondary cooling water to the outside, and the secondary cooling system. A cooling system in a nuclear facility having a refrigerator connected in series in the middle of a side cooling water pipe and supplying cold water to the secondary side cooling water pipe, storing cold heat, and at least temporarily It has a cold heat storage tank capable of supplying cold water to the secondary side cooling water pipe.

According to the third aspect of the present invention, it is possible to reduce the number of cooling system pumps, piping and valves for the refrigerator. Further, by using the cold heat storage tank, the capacity of the refrigerator can be reduced.

The invention described in claim 4 is the same as claim 1.
In the cooling system for a nuclear power facility according to any one of 1 to 3, the cold heat storage tank is an ice heat storage tank.

According to the invention of claim 4, in addition to the effects and advantages of any one of claims 1 to 3, by performing ice storage, downsizing of the cold heat storage tank and suppression of temperature fluctuation of the cold heat storage tank can be achieved. It is possible.

The invention described in claim 5 is the same as claim 1.
In the cooling system for a nuclear facility according to any one of 1 to 3, the cold heat storage tank is a water storage tank. According to the invention of claim 5, in addition to the effects and advantages of any one of claims 1 to 3, the use of the water tank can simplify the facility and operation.

The invention according to claim 6 is the same as claim 1.
The nuclear power plant cooling system according to any one of items 1 to 5, further comprising a cold heat storage tank refrigerator for storing the cold heat, in addition to the refrigerator.

According to the invention of claim 6, in addition to the operation and effect of any one of claims 1 to 5, it has an advantage that it is easy to control because it has a separate refrigerator for a cold heat storage tank. is there.

The invention described in claim 7 is the same as claim 1.
In the nuclear facility cooling system according to any one of 1 to 5, the refrigerator also serves as a cold heat storage refrigerator for storing cold heat in the cold heat storage tank, and an operation of storing cold heat in the cold heat storage tank is performed. The operation for utilizing the cold heat stored in the cold heat storage tank to cool the fuel pool is configured to be switched by switching a valve. According to the invention of claim 7, claim 1
In addition to the effect or effect of any one of 5 to 5, there is an advantage that the number of refrigerators can be small.

The invention according to claim 8 is a heat exchanger for cooling and purifying a fuel pool, which is connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and the fuel. Pool cooling purification system Reactor auxiliary equipment cooling system that guides secondary side cooling water that has undergone heat exchange in a heat exchanger through a secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside, and the fuel pool A cooling system for supplying cold water to the inside of a nuclear facility, which is capable of supplying the cooling water produced by the refrigerator to a load destination other than the fuel pool at least during operation of the reactor. It is characterized in that it is connected by pipes.

According to the invention of claim 8, the fuel pool refrigerator cooling system can be utilized even during the operation of the nuclear reactor, and efficient operation can be carried out. For example, in recent years, the control system of the reactor recirculation pump has been replaced from the conventional MG (motor / generator) set system to the VVVF (variable voltage variable frequency) system, but this refrigerator cooling system is used as a cooling source for the VVVF panel. Can be used. It can also be used for cooling dry wells.

The invention described in claim 9 is the same as that of claim 8.
In the nuclear facility cooling system according to claim 1, the load destinations other than the fuel pool are a drywell cooler that cools the drywell that stores the reactor, a drywell dehumidification system, and a ventilation air conditioning auxiliary equipment regular cooling water system. At least one of them is included.

According to the invention of claim 9, in addition to the operation and effect of claim 8, cold water of low temperature (for example, about 10 ° C.) can be supplied to a drywell cooler or the like during operation of the plant. The dry well environment during operation can be improved.

The invention according to claim 10 is a heat exchanger for cooling and purifying a fuel pool, which is connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and the fuel. Pool cooling purification system Reactor auxiliary equipment cooling system that guides secondary side cooling water that has undergone heat exchange in a heat exchanger through a secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside, and the fuel pool A cooling system for supplying cold water to a nuclear power plant in a nuclear facility, the cooling water produced by the refrigerator being related to a nuclear reactor other than the nuclear reactor at least during operation of the nuclear reactor. It is characterized in that it is connected by piping so that it can be supplied to the load destination. According to the tenth aspect of the present invention, the fuel pool refrigerator cooling system is shared among a plurality of nuclear reactors, so that it is used more frequently and can be efficiently operated.

The invention according to claim 11 is the cooling system in the nuclear facility according to any one of claims 1 to 10, further comprising a thermometer installed on the inlet side of the refrigerator for supplying the cold water, And a control means for controlling the output of the thermometer to approach the target value.

According to the invention of claim 11, in addition to the operation and effect of any one of claims 1 to 10, even when the temperature of the cold water returning to the refrigerator is higher than the design value, the refrigerator is burdened. It is possible to drive stably without applying

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] (Relevant to Claims 1, 4, 6, 8, 10, 11 etc.) FIG. 1 shows a first embodiment of a cooling system in a nuclear facility according to the present invention. The form of will be described. In FIG. 1, the same or similar parts as those in FIG. 7 are designated by the same reference numerals, and the description of the overlapping parts will be omitted.

In this embodiment, as shown in FIG. 1, it is connected to a reactor auxiliary cooling water system cooling water pipe 5a for guiding the secondary side cooling water of the fuel pool cooling and purification system heat exchanger 5 of the fuel pool purification system. An ice heat storage tank cold water supply pipe 23, which uses the ice heat storage tank 14 as a cooling source and supplies cold water by the ice heat storage tank cooling system pump 13, is connected to the refrigerator cooling water supply pipe 20 thus prepared. In addition, the refrigerator cold water return pipe 21 is connected to a heat storage tank cold water return pipe 24 which uses the ice heat storage tank 14 as a cooling source and supplies cold water by the heat storage tank cooling system pump 13. Further, the ice storage tank cooling system switching valve 12 is installed on the cold water supply pipe 23 and the cold water return pipe 24. The ice in the ice heat storage tank is manufactured by the ice making refrigerator 22 before the plant is stopped.

The cold water supply pipe 25 to the cooling required load 16 during the plant operation is connected to the freezer cold water supply pipe 20 after the freezer cold water supply pipe 20 and the ice storage tank cooling supply pipe 23 have joined together, and the freezer is connected. The chiller cold water return pipe 21 before the chilled water return pipe 21 and the heat storage tank cooling water system return pipe 24 branch
The chilled water return pipe 26 from the cooling required load 16 during the plant operation is connected above. Further, the cooling required load switching valve 15 during plant operation is installed on the cold water supply pipe 25 to the cooling required load 16 during plant operation and the cold water return pipe 26 from the cooling required load 16 during plant operation. The cooling required load 16 during plant operation includes, for example, a VVVF cooling device, a turbine generator excitation device cooling device, an off-gas condenser cooling device, and the like.

On the refrigerator chilled water supply pipe 20 after the chiller chilled water supply pipe 20 and the heat storage tank cooling supply pipe 23 are joined,
The cold water supply pipe 27 to the other plant cooling required load 18 is connected. A chilled water return pipe 28 from another plant cooling required load 18 is connected to the chiller cold water return pipe 21 before the chiller chilled water return pipe 21 and the ice storage tank cooling supply pipe 23 join. Further, on the chilled water supply pipe 27 to the other plant cooling required load 18 and the chilled water return pipe 28 from the other plant cooling required load 18, the other plant cooling required load switching valve 1
Set up 7.

A refrigerator temperature adjusting pipe 29 is installed between the refrigerator cold water supply pipe 20 and the refrigerator cooling water return pipe 21 on the suction side of the refrigerator cooling system pump 10, and the temperature is adjusted on the refrigerator temperature adjusting pipe 29. The control valve 31 is installed. In addition, the refrigerator 11
A thermometer 30 is installed at the entrance of the. The temperature control valve 31 automatically controls the opening so that the value of the thermometer 30 becomes constant.

Next, the operation of this embodiment will be described. The heat removal from the fuel pool 1 at the time of inspection of the seawater system at the time of reactor shutdown as in the conventional case is performed by the fuel pool cooling / purification system heat exchanger 5 by the fuel pool cooling / purification system heat exchanger 5 and the refrigerator cooling system pump 10 The cooling water is circulated and the refrigerator 11 removes heat.

Further, in the present embodiment, when the amount of decay heat in the fuel pool 1 is large, the cooling water to the fuel pool cooling / purifying system heat exchanger 5 is supplied to the refrigerator cooling system pump 10 and the ice storage tank cooling system pump 13. Heat is removed in the refrigerator 11 having a capacity smaller than that of the conventional system and in the ice heat storage tank 14 that makes ice during operation of the plant. Further, when the cooling energy in the ice heat storage tank is exhausted by the operation of the two systems described above (when the ice made is exhausted), the fuel pool 1 has already been consumed.
Since the amount of decay heat is small, the ice storage tank cooling system pump 13 is stopped, the ice storage tank cooling system valve 12 is closed, and heat is removed by operating only the refrigerator cooling system.

Conventionally, the refrigerator cooling system during the operation of the plant has not been used. On the other hand, in the present embodiment, even when the plant is in operation, the cooling required load 16 during the plant operation is 16
The cold water is supplied to the other plant cooling required load 18 by two systems (or one system) of the refrigerator cooling system pump 10 and the ice storage tank cooling system pump 13 to remove the heat in each load. Switching to each cooling system and each load is performed by opening and closing the ice storage tank cooling system valve 12 and valves 15 and 17, respectively.

Conventionally, the cold water discharged from the refrigerator 11 by the refrigerator cooling system pump 10 passes through the fuel pool cooling / purifying system heat exchanger 5, and the heat-exchanged cold water is heated and returns to the refrigerator 11. On the other hand, a part of the cold water discharged from the refrigerator 11 is passed through the refrigerator temperature control pipe 29 branched from the refrigerator cold water supply pipe 20. The amount of cold water passing through the refrigerator temperature adjusting pipe 29 is adjusted by the temperature adjusting valve 31. The method is to measure the temperature after mixing the cold water that has passed through the refrigerator temperature control pipe 29 and the cold water that has passed through the fuel pool cooling and purification system heat exchanger 5 with the thermometer 30, and measure this temperature. The temperature control valve 31 is operated so as to approach the set target temperature range.

According to the present embodiment, the heat removal from the fuel pool 1 at the time of inspection of the seawater system at the time of reactor shutdown is shared by both the refrigerator cooling system and the ice heat storage cooling system, so that the refrigerator 11
The capacity of can be reduced. When the cooling energy in the ice heat storage tank 14 is exhausted, the amount of decay heat of the fuel pool 1 is also small, and efficient operation can be performed by stopping the ice heat storage cooling system and switching to operation of only the refrigerator cooling system.

By operating the refrigerator cooling system pump 10 and the ice storage tank cooling system pump 13 even while the plant is operating, and supplying the heat load required for cooling during the plant operation and the heat load required for cooling in another plant, The refrigerator 11 and the ice heat storage tank 14 can be utilized to the maximum extent.

Further, the refrigerator temperature control pipe 29 and the thermometer 3
0, by installing the temperature control valve 31, the fluctuation of the cold water temperature returning to the refrigerator 11 is reduced, and stable operation can be performed. In addition, since the refrigerator cooling system and the ice storage tank cooling system piping have a heat load during plant operation and shutdown, it is difficult to freeze even in winter, so draining water and installing an electric heater for piping heat insulation materials are not implemented. The cost is reduced. In this embodiment, since the ice heat storage tank 14 is installed to store cold heat by latent heat, it is possible to downsize the cold heat storage tank and suppress the temperature fluctuation of the cold heat storage tank.

[Second Embodiment] (Claims 1, 5,
7, 8, 10, 11, etc.) With reference to FIG. 2, a second embodiment of the cooling system in a nuclear facility according to the present invention will be described. In FIG. 2, parts that are the same as or similar to those in FIG. 1 or FIG.
A description of the overlapping parts will be omitted.

In this embodiment, as shown in FIG. 2, refrigerating machine cold water connected to a reactor auxiliary machine cooling water system cooling water pipe 5a for guiding the secondary side cooling water of the fuel pool cooling / purifying system heat exchanger 5. A water storage tank 34 (for example, an existing condensate storage tank) as a cold heat storage tank is installed in the supply pipe 20. Also water tank 3
4, a water tank cooling system pump 3 for supplying cold water
3 is installed and returned to the fuel pool cooling / purifying system heat exchanger 5 through the water storage tank cold water supply pipe 36.

Further, a water storage tank cooling system switching valve 35 is installed on the water storage tank cold water supply pipe 36 and the water storage tank cold water return pipe 37. Further, a water tank cooling outlet pipe 39 branched from the water tank cold water supply pipe 36 is connected to the suction side of the refrigerator cooling system pump 10, and a water tank cooling return pipe 40 branched from the refrigerator cold water supply pipe 20 is stored. Connect to the top of tank 34. Further, a water storage tank switching valve 38 is installed on the water storage tank cooling outlet pipe 39 and the water storage tank cooling return pipe 40.

On the refrigerator chilled water supply pipe 20 after the chiller chilled water supply pipe 20 and the water storage tank cooling supply pipe 36 are joined,
The cold water supply pipe 25 to the cooling required load 16 (turbine generator exciting device cooling device, off-gas condenser cooling device, etc.) during plant operation is connected, and the refrigerator cold water return pipe 21 is connected to the water tank cooling water system return pipe 37. The chilled water return pipe 26 from the cooling required load 16 during plant operation is connected to the refrigerator chilled water return pipe 21 before branching. Further, on the cold water supply pipe 25 to the cooling required load 16 during plant operation and on the cold water return pipe 26 from the cooling required load 16 during plant operation,
A cooling required load switching valve 15 is installed during plant operation.

On the refrigerator chilled water supply pipe 20 after the chiller chilled water supply pipe 20 and the water storage tank cooling supply pipe 36 are joined,
The cold water supply pipe 27 to the other plant cooling required load 18 is connected, and the refrigerator cold water return pipe 21 and the water storage tank cooling supply pipe 3 are connected.
The chilled water return pipe 28 from the other plant cooling required load 18 is connected to the refrigerator chilled water return pipe 21 before the merging of the seven. Further, on the chilled water supply pipe 27 to the other plant cooling required load 18 and the chilled water return pipe 28 from the other plant cooling required load 18, the other plant cooling required load switching valve 17 is provided.
Set up.

Next, the operation of this embodiment will be described. As in the conventional case, the heat removal of the fuel pool 1 at the time of inspection of the seawater system at the time of reactor shutdown is performed by the fuel pool cooling / purification system pump 3 via the fuel pool cooling / purification system heat exchanger 5 and the refrigerator cooling system pump The cooling water is circulated and the refrigerator 11 removes heat.

Further, in the present embodiment, when the amount of decay heat in the fuel pool 1 is large, the cooling water for the fuel pool cooling / purifying system heat exchanger 5 is supplied to the refrigerator cooling system pump 10 and the water tank cooling system pump 33. Heat is removed from the refrigerator 11 having a smaller capacity than the conventional system and the water storage tank 34 that is cooled during the plant operation. Further, when the cooling energy of the water storage tank is exhausted due to the operation in the two systems described above, the amount of decay heat in the fuel pool 1 is small, so the water storage tank cooling system pump 33 is stopped and the water storage tank cooling system valve 35 is turned on. Close and remove heat only by operating the refrigerator cooling system.

At this time, since the water temperature of the water storage tank 34 must be low enough to function as cold water, the water storage tank cooling system valve 35 is closed and the water storage tank valve 3 is closed during plant operation.
By opening 8 and starting the refrigerator cooling system pump 10,
The water in the water storage tank 34 is cooled.

Conventionally, the refrigerator cooling system during plant operation has not been used. On the other hand, in the present embodiment, even when the plant is in operation, the cooling required load 16 during the plant operation is 16
Also, two systems (or one system) of the refrigerator cooling system pump 10 and the ice storage tank cooling system pump 13 are circulated to the other plant cooling required load 18 to supply cold water, and heat is removed at each load. Switching to each cooling system and each load is performed by opening and closing the water tank cooling system valve 35 and the valves 15 and 17, respectively.

According to the present embodiment, both the refrigerator cooling system and the water tank cooling system share the heat removal of the fuel pool 1 at the time of inspection of the seawater system at the time of reactor shutdown, so that the capacity of the refrigerator 11 is increased. Can be made smaller. When the cooling energy of the water storage tank cooling system is exhausted, the amount of decay heat in the fuel pool 1 is small, so efficient operation can be performed by stopping the water storage tank cooling system and switching to operation of only the refrigerator cooling system.

The refrigerator cooling system pump 10 and the water storage tank cooling system pump 33 are operated even during the operation of the plant, and the heat load required for cooling during the operation of the plant or the heat load required for cooling in another plant is supplied. Alternatively, by operating the refrigerator 11 to cool the water temperature of the water storage tank 34, the refrigerator 11
And the water tank 34 can be utilized to the maximum extent. Also, the number of refrigerators can be reduced as compared with the first embodiment (FIG. 1). Further, since the water storage tank is used as the cold heat storage tank, the facility and operation are simpler than the case of storing ice heat.

Further, since the piping of the refrigerator cooling system and the water storage tank cooling system has a heat load during plant operation and shutdown, it is difficult to freeze even in the winter season, so draining water and installing an electric heater for piping heat insulating material are carried out. Without doing so, the cost will be reduced.

As described above, the second embodiment (FIG. 2) is different from the first embodiment (FIG. 1) in the following two points. A water storage tank 34 is used instead of the ice heat storage tank 14. Instead of using the dedicated ice making (for cold heat storage tank) refrigerator 22, the pipe 40 and the valve 38 are provided, and the refrigerator 11 is switched between the cold heat storage operation and the cold heat discharge operation. As a modification of the second embodiment, it is also possible to adopt the above or only one and make the other similar to the first embodiment (an eclectic combination of both embodiments) (not shown). ). Furthermore, above, one or both of
It can also be applied to fifth and sixth embodiments described later (not shown).

[Third Embodiment] (Claims 8, 9, and 1)
0, 11 etc.) A third embodiment of the cooling system in a nuclear facility according to the present invention will be described with reference to FIG. In FIG. 3, parts that are the same as or similar to those in FIG. 1 or FIG. 7 are given the same reference numerals, and descriptions of overlapping parts will be omitted.

In this embodiment, as shown in FIG. 3, among the reactor auxiliary cooling water system cooling water pipes 5a for guiding the secondary side cooling water of the fuel pool cooling / purifying system heat exchanger 5 of the fuel pool cleaning system. The refrigerator cooling water supply pipe 20 is connected to the drywell cooler supply pipe 41 used as cold water for the drywell cooler 44, and the drywell cooler return pipe 42 is connected.
The refrigerator cooling system return pipe 21 is connected to the top. Further, the drywell cooler switching valve 4 is provided on the drywell cooler supply pipe 41 and the drywell cooler return pipe 42, respectively.
Install 3, 48.

Next, the operation of this embodiment will be described. During the reactor operation, the dry well cooler switching valve 48 is closed, and the refrigerator cooling system switching valve 19 and the dry well cooler switching valve 43 are closed.
Open, and cool water of about 10 ° C. by the refrigerator 11 through the refrigerator supply pipe 20 and the drywell cooler supply pipe 41,
Water is passed through the drywell cooler 44. The drywell cooler 44 exchanges heat with the air in the drywell, and the cold water whose temperature has risen returns to the refrigerator 11 through the drywell cooler return pipe 42 and the refrigerator cooling system return pipe 21.

During the periodic inspection during the seawater cooling system regular inspection, the reactor auxiliary equipment cooling water system switching valve 9 and the drywell cooler switching valve 43 are closed, and the drywell cooler switching valve 48 and the refrigerator cooling system switching valve. By opening 19, the water can be passed through the fuel pool cooling / purifying system heat exchanger 5 as in the conventional case, and the water in the fuel pool 1 can be cooled.

According to the present embodiment, a new refrigerator is installed and water is passed through the dry well 32 without opening a through hole in the dry well 32. By using the well cooler supply pipe 41 and the dry well cooler return pipe 42) and the refrigerator cooling system, cold water of about 10 ° C. can be supplied to the dry well cooler 44 and the temperature inside the dry well is lowered. You can

[Fourth Embodiment] (Claims 8, 9, and 1)
0, 11 etc.) A fourth embodiment of the cooling system in a nuclear facility according to the present invention will be described with reference to FIG. In FIG. 4, parts that are the same as or similar to those in FIG. 1, FIG. 3, and FIG. 7 are given the same reference numerals, and descriptions of overlapping parts will be omitted.

In the present embodiment, as shown in FIG. 4, the dry well cooler 4 is provided with three ventilation air conditioning air conditioner auxiliary working cooling water system supply pipes 45 and three ventilation air conditioning air conditioner auxiliary working water cooling system return pipes 46.
4 is connected. Three drywell coolers 44 are connected to the ventilation air conditioning auxiliary equipment regular cooling water system, but the ventilation air conditioning auxiliary equipment regular cooling water system cold water can only be supplied to one of these units.

For this reason, the refrigerator cooling water supply pipe 20 is connected to the ventilation cooling air conditioner auxiliary cooling water system supply pipe 45, and the secondary well of the fuel pool cooling purification system heat exchanger 5 of the fuel pool purification system is connected to the dry well cooler 44. Of the reactor auxiliary equipment cooling water system cooling water piping that is the side cooling water, the drywell cooler supply piping 41 is used as the cold water of the drywell cooler 44.
Is connected to the refrigerator cooling water supply pipe 20, the ventilation air conditioning auxiliary device normal cooling water system return pipe 46 is connected to the refrigerator cooling system return pipe 21, and the ventilation air conditioning auxiliary device normal cooling water system supply pipe 45 and the ventilation air conditioning auxiliary device normal Ventilation and air conditioning auxiliary equipment regular cooling water system switching valves 47 are installed on the cooling water system return pipes 46, respectively.

Next, the operation of this embodiment will be described. During the reactor operation, the refrigerator cooling system switching valve 19 is closed, the ventilation air conditioning auxiliary equipment normal cooling water system switching valve 47 is opened, and cold water of about 10 ° C. is cooled by the refrigerator 11 to the refrigerator cooling water supply pipe 20 and the ventilation. Water is supplied to the drywell cooler 44 through an air conditioning auxiliary equipment regular cooling water system supply pipe 45. The dry well cooler 44 exchanges heat with the air in the dry well 32, and the cold water whose temperature has risen returns to the refrigerator 11 through the ventilation air conditioning auxiliary equipment regular cooling water system return pipe 46 and the refrigerator cooling system return pipe 21.

During the periodic inspection, during the periodic inspection of the seawater cooling system, the ventilation air conditioning auxiliary equipment regular cooling water system switching valve 47, the reactor auxiliary equipment cooling water system switching valve 9 are closed, and the refrigerator cooling system switching valve 19 is opened. By doing so, water can be passed through the fuel pool cooling / purifying system heat exchanger 5 as in the conventional case, and the fuel pool water can be cooled.

According to the present embodiment, a new refrigerating machine is installed and water is passed through the dry well 32 without opening a through hole in the dry well 32. Ventilation and air conditioning auxiliary equipment Regular cooling water system supply pipe 4
5. Ventilation and air conditioning auxiliary equipment Regular cooling water system return pipe 46) and refrigerator cooling system
It is possible to supply cold water of about 10 ° C. to 4 and to lower the temperature in the dry well.

[Fifth Embodiment] (claims 2, 4,
6, 8, 10, 11, etc.) A fifth embodiment of the cooling system in a nuclear facility according to the present invention will be described with reference to FIG. In FIG. 5, parts that are the same as or similar to those in FIG. 1 or 7 are given the same reference numerals, and descriptions of overlapping parts will be omitted.

In this embodiment, as shown in FIG. 5, refrigeration connected to the reactor auxiliary cooling water system pipe 5a for guiding the secondary side cooling water of the fuel pool cooling / purification system heat exchanger 5 of the fuel pool purification system. The machine cooling system is removed, the refrigerator cold water supply pipe 20 and the refrigerator cold water return pipe 21 are connected to the fuel pool 1, and the refrigerator cooling system pump 10 is installed on the refrigerator cold water supply pipe 20.

Next, the operation of this embodiment will be described. From the refrigerator chilled water supply pipe 20 connected to the fuel pool 1, pool water of the fuel pool 1 is sent to the refrigerator 11 by activating the refrigerator cooling system pump 10. The pool water of the fuel pool 1 is removed by the refrigerator 11, and the cold water is returned to the refrigerator cold water return pipe 21.
Return to Fuel Pool 1 through.

According to the present embodiment, the heat removal from the fuel pool 1 during the inspection of the seawater system at the time of reactor shutdown is directly cooled by the refrigerator cooling system and the ice storage cooling system, so that the heat of the fuel pool cooling and purification system is reduced. The heat of the fuel pool 1 can be efficiently removed without passing through the exchanger. Further, when the heat quantity of the fuel pool 1 becomes small, the ice heat storage cooling system is stopped and switched to the operation of only the refrigerator cooling system, whereby efficient operation can be performed.

Furthermore, since the refrigerator cooling system and the ice storage tank cooling system piping have a heat load, they do not freeze even in the winter, so it is not necessary to drain water or lay an electric heater for the pipe heat insulating material, which leads to cost reduction. Become.

[Sixth Embodiment] (claims 3, 4,
6, 8, 10, 11, etc.) A sixth embodiment of the cooling system for a nuclear facility according to the present invention will be described with reference to FIG. In FIG. 6, parts that are the same as or similar to those in FIG. 1 or FIG. 7 are given the same reference numerals, and descriptions of overlapping parts will be omitted.

In this embodiment, as shown in FIG. 6, the reactor auxiliary cooling water system pump 6 is installed on the refrigerator cold water system return pipe 21, and the refrigerator cold water system return pipe 21 is cooled. Connected to the outlet side of the water-based heat exchanger 7. Further, the refrigerator cooling water supply pipe 20 is connected to the inlet side of the reactor auxiliary cooling water system heat exchanger 7.

Next, the operation of this embodiment will be described. As in the conventional case, the heat removal from the fuel pool 1 at the time of inspection of the seawater system at the time of reactor shutdown is cooled by the fuel pool cooling / purification system pump 3 via the fuel pool cooling / purification system heat exchanger 5 by the refrigerator cooling system pump 10. Heat is removed from the refrigerator 11 by circulating water.

Further, in the present embodiment, when inspecting the seawater system when the reactor is shut down, the reactor auxiliary cooling water system pump 6 is started, and heat is exchanged in the fuel pool cooling and purification system heat exchanger 5 to raise the temperature. The cold water of the reactor auxiliary cooling water system passes through the reactor auxiliary cooling water system heat exchanger 7 and the reactor auxiliary cooling water system pump 6, and is sent to the refrigerator 11 to remove heat.

According to the present embodiment, the reactor auxiliary cooling water system pump 6 can be used as a substitute for the conventional refrigerating machine cooling system pump 10, and the number of valves and the amount of pipes can be reduced as compared with the conventional one, which is economical. System.

[0077]

As described above, according to the present invention,
A cooling system in a nuclear facility capable of efficient operation can be provided in consideration of fluctuations in heat load in the fuel pool.

[Brief description of drawings]

FIG. 1 is a first cooling system in a nuclear facility according to the present invention.
3 is a systematic diagram of the embodiment of FIG.

FIG. 2 is a second cooling system in a nuclear facility according to the present invention.
3 is a systematic diagram of the embodiment of FIG.

FIG. 3 is a third cooling system in a nuclear facility according to the present invention.
3 is a systematic diagram of the embodiment of FIG.

FIG. 4 is a fourth cooling system in a nuclear facility according to the present invention.
3 is a systematic diagram of the embodiment of FIG.

FIG. 5 is a fifth example of the cooling system in the nuclear facility according to the present invention.
3 is a systematic diagram of the embodiment of FIG.

FIG. 6 is a sixth view of the cooling system in a nuclear facility according to the present invention.
3 is a systematic diagram of the embodiment of FIG.

FIG. 7 is a system diagram of a conventional cooling system in a nuclear facility.

[Explanation of symbols]

1 ... Fuel pool, 2 ... skimmer surge tank, 3 ... fuel pool cooling / purification system pump, 4 ... fuel pool cooling / purification system filter desalting device, 5 ... fuel pool cooling / purification system heat exchanger, 6 ... reactor auxiliary equipment cooling Water system pump, 7 ... Reactor auxiliary machine cooling water system heat exchanger, 8 ... Seawater cooling system pump, 9 ... Reactor auxiliary machine cooling water system switching valve, 10 ... Refrigerator cooling system pump, 11 ... Refrigerator, 1
2 ... Ice storage tank cooling system switching valve, 13 ... Ice storage tank cooling system pump, 14 ... Ice storage tank, 15 ... Cooling required load switching valve during operation, 16 ... Cooling required load during operation, 17 ... Other plant cooling required load Switching valve, 18 ... Other plant cooling required load, 19
... Refrigerator cooling system switching valve, 20 ... Refrigerator cold water supply pipe, 2
1 ... Refrigerator Cold water system return pipe (1), 22 ... Refrigerator for ice making,
23 ... Ice heat storage tank cold water system supply pipe, 24 ... Ice heat storage tank cold water system return pipe, 25 ... Cooling required load supply pipe during operation, 26 ...
Cooling required load return pipe during operation, 27 ... Other plant cooling required load supply pipe, 28 ... Other plant cooling required load return pipe, 29 ... Refrigerator temperature control pipe, 30 ... Thermometer, 31 ...
Temperature control valve, 32 ... Dry well, 33 ... Water tank cooling system pump, 34 ... Water tank, 35 ... Water tank cooling system switching valve, 3
6 ... Water tank cold water system supply pipe, 37 ... Water tank cold water system return pipe, 38 ... Water tank valve, 39 ... Water tank cooling system outlet pipe, 4
0 ... Water tank cooling system return pipe, 41 ... Drywell cooler supply pipe, 42 ... Drywell cooler return pipe, 43 ...
Drywell cooler switching valve, 44 ... Drywell cooler, 45 ... Ventilation and air conditioning auxiliary equipment regular cooling water system supply pipe, 46 ...
Ventilation and air conditioning auxiliary equipment regular cooling water system return pipe, 47 ... Ventilation and air conditioning auxiliary equipment regular cooling water system switching valve, 48 ... Drywell cooler switching valve.

Claims (11)

[Claims] 1. A fuel pool cooling / purifying system heat exchanger connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and heat in the fuel pool cooling / purifying system heat exchanger. Branching from the secondary side cooling water pipe to the reactor auxiliary equipment cooling system that guides the exchanged secondary side cooling water through the secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside A refrigerator for supplying cold water to the secondary side cooling water pipe,
A cooling system in a nuclear facility, comprising a cold heat storage tank capable of storing cold heat and at least temporarily supplying cold water to the secondary side cooling water pipe. 2. A fuel pool cooling / purifying system heat exchanger that is connected to a fuel pool installed adjacent to a nuclear reactor and cools water in the fuel pool, and heat in the fuel pool cooling / purifying system heat exchanger. Reactor auxiliary equipment cooling system that guides the exchanged secondary side cooling water through the secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside, and in the fuel pool connected to the fuel pool A cooling system for a nuclear facility, comprising a refrigerator for cooling water, and having a cold heat storage tank capable of storing cold heat and at least temporarily supplying the cold water directly to the fuel pool without using a heat exchanger. , A cooling system for nuclear facilities. 3. A fuel pool cooling / purifying system heat exchanger that is connected to a fuel pool installed adjacent to a nuclear reactor and cools water in the fuel pool, and heat in the fuel pool cooling / purifying system heat exchanger. A reactor auxiliary cooling system that guides the exchanged secondary side cooling water through the secondary side cooling water pipe and releases the heat of the secondary side cooling water to the outside, and in series in the middle of the secondary side cooling water pipe. A cooling system in a nuclear facility having a refrigerator connected to supply cold water to the secondary side cooling water pipe, which stores cold heat and at least temporarily supplies cold water to the secondary side cooling water pipe. A cooling system in a nuclear facility, characterized by having a cold heat storage tank that can be supplied. 4. The cooling system in a nuclear facility according to claim 1, wherein the cold heat storage tank is an ice heat storage tank. 5. The cooling system for a nuclear power facility according to claim 1, wherein the cold heat storage tank is a water storage tank. 6. The cooling system for a nuclear power facility according to claim 1, further comprising a refrigerator for a cold heat storage tank for storing the cold heat, separately from the refrigerator. 7. The refrigerator also serves as a cold heat storage refrigerator for storing cold heat in the cold heat storage tank, and stores the cold heat in the cold heat storage tank and the cold heat stored in the cold heat storage tank. The cooling system in the nuclear facility according to any one of claims 1 to 5, wherein the operation used for cooling the fuel pool is configured to be switched by switching a valve. 8. A heat exchanger in a fuel pool cooling / purification system heat exchanger, which is connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and heat in the fuel pool cooling / purification system heat exchanger. A reactor auxiliary equipment cooling system that guides the exchanged secondary side cooling water through a secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside, and a refrigerator that supplies the cooling water to the fuel pool. In a nuclear facility cooling system having, cooling water made by the refrigerator, at least during operation of the nuclear reactor, is connected by piping so as to be able to supply to a load destination other than the fuel pool, A cooling system for nuclear facilities. 9. The load destination other than the fuel pool is at least one of a drywell cooler that cools a drywell that stores the nuclear reactor, a drywell dehumidification system, and a ventilation water system for a ventilation air conditioning auxiliary equipment. The cooling system in the nuclear facility according to claim 8, wherein the cooling system is included. 10. A fuel pool cooling / purifying system heat exchanger connected to a fuel pool installed adjacent to a nuclear reactor to cool water in the fuel pool, and heat in the fuel pool cooling / purifying system heat exchanger. A reactor auxiliary equipment cooling system that guides the exchanged secondary side cooling water through a secondary side cooling water pipe to release the heat of the secondary side cooling water to the outside, and a refrigerator that supplies the cooling water to the fuel pool. A cooling system in a nuclear facility having a pipe connection so that the cooling water produced by the refrigerator can be supplied to a load destination related to a nuclear reactor other than the nuclear reactor at least during operation of the nuclear reactor. The cooling system in a nuclear facility, which is characterized by 11. A thermometer installed on the inlet side of the refrigerator for supplying the cold water, and a control means for controlling the output of the thermometer so as to approach the target value. 11. The cooling system in a nuclear facility according to any one of 1 to 10.