JPH0665841B2 - Load control method and device for auxiliary cooling system of power plant - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control method and device for an auxiliary cooling system of a power plant, and particularly omits a spare capacity of the auxiliary cooling system,
Moreover, the present invention relates to a load control method and device for an auxiliary cooling system of a power generation plant, which is suitable for reducing the plant load and continuing the plant operation when an abnormality occurs in the auxiliary cooling water system or the auxiliary cooling seawater system.

[Background of the Invention]

As a prior art for this type of auxiliary cooling system for power plants,
There is a magazine, thermal nuclear power generation Vol.33 (published by the Japan Thermal Power Nuclear Power Technology Association) No.2 P183 to P186, and the prior art is shown in FIG.

The auxiliary machine cooling system of the power plant shown in FIG. 4 includes an auxiliary machine cooling water system, a heat exchanger array, and an auxiliary machine cooling seawater system.

The auxiliary cooling water system includes a cooling water pump 1, a fresh water inlet pipe 2 connecting the cooling water pump 1 and a heat exchanger row, and a heat exchanger bypass pipe 3.
A temperature control valve 6, a fresh water outlet pipe 5 connecting the heat exchanger array and the temperature control valve 6, a temperature controller 7, and a fresh water pipe 8 connecting the temperature control valve 6 and the equipment to be cooled 9. is doing. The cooling water pump 1 is installed [33% capacity × 3 units].

The heat exchanger array is equipped with [33% capacity × 3 units] heat exchangers 4.

The auxiliary equipment cooling seawater system has a cooling seawater pump 10, a seawater inlet pipe 11 connecting the pump 10 to a heat exchanger row, and a seawater outlet pipe 12 connected to the heat exchanger row. The cooling seawater pump 10 is installed [33% capacity × 3 units].

In the accessory cooling water system, the cooling water whose pressure is increased by the cooling water pump 1 passes through the fresh water inlet pipe 2 and the heat exchanger 4
The temperature is controlled by the temperature control valve 6 through the fresh water outlet pipe 5, passes through the fresh water pipe 8, and the temperature is increased by the cooled device 9 for cooling the plant accessories, and the cooling water pump 1 is cooled. It's getting back.

On the other hand, in the auxiliary cooling seawater system, the cooling seawater whose pressure is increased by the cooling seawater pump 10 is sent to the heat exchanger 4 through the seawater inlet pipe 11, cools the heat exchanger 4, and cools the seawater outlet pipe 12. Is released outside the system (drainage channel).

In the temperature control in the auxiliary equipment cooling system, the temperature is detected by the temperature controller 7 installed in the fresh water pipe 8 and is controlled by the temperature control valve 6 so that the temperature is the predetermined temperature required by the equipment 9 to be cooled. The temperature control valve 6 is connected to the heat exchanger 4 through the fresh water inlet pipe 2.
Since the heat exchanger 4 is bypassed through the heat exchanger bypass pipe 3 and the cooling water cooled in step 1, the flow rate of the cooling water that is not cooled is adjusted so that the temperature of the device to be cooled 9 is controlled. I have to.

By the way, if, for example, one cooling water pump 1 trips due to a failure, the cooling water flow rate for cooling the equipment 9 to be cooled is 66.
%, And the cooling capacity of auxiliary equipment is reduced.

Further, for example, if one cooling seawater pump 10 trips due to a failure, the flow rate of the cooling seawater to the heat exchanger 4 decreases to about 66%, the cooling capacity of the heat exchanger 4 decreases, and the cooling water in the fresh water pipe 8 decreases. The temperature rises, the temperature required to cool the equipment 9 to be cooled cannot be maintained, and the auxiliary equipment cooling capacity becomes insufficient.

Also, when the heat exchanger 4 fails, the temperature in the fresh water pipe 8 rises even when the cooling capacity is reduced due to blockage or breakage of the cooling thin tube, and the predetermined temperature necessary for cooling the equipment to be cooled 9 cannot be secured, so that the auxiliary equipment Insufficient cooling capacity.

When the auxiliary equipment cooling capacity of the cooled equipment 9 decreases,
The following problems occur.

As the equipment to be cooled 9, there are a generator stator cooling water cooler, a phase separation bus cooler, a hydrogen cooler, a main turbine oil cooler, a feed water pump driving turbine oil cooler, etc. In order to continue, a predetermined amount of cooling water and a predetermined cooling water temperature are required, and if the auxiliary equipment cooling capacity is reduced due to the above-mentioned abnormality, the following problems will occur.

Turbine trips to prevent damage to the stator due to a rise in the temperature of the generator stator cooling water, leading to the plant scrum. The turbine is tripped to prevent damage to the main turbine due to the temperature rise of the oil in the main turbine oil cooler, leading to the plant scrum.

As described above, in the prior art, when the cooling water pump 1, the cooling seawater pump 10 and the heat exchanger 4 do not have reserve capacities, when the cooling water pump, the cooling seawater pump 10 or the heat exchanger 4 has an abnormality, the plant There is a problem that the operation cannot be continued and the plant is stopped.

However, when the cooling water pump, the cooling seawater pump, and the heat exchanger are provided with a spare capacity, for example, by installing [50% capacity × 3 units], there is a problem that the facility cost becomes significantly large.

[Object of the Invention]

An object of the present invention is to solve the above-mentioned problems of the prior art, and in an accessory cooling system without reserve capacity, an abnormality occurs in at least one of the accessory cooling water system and the accessory cooling seawater system, Even if the cooling capacity declines, the plant operation can be continued within the range of the auxiliary equipment cooling capacity, and if an error occurs in any of the multiple heat exchangers that make up the heat exchanger row. , Shorten the operating time in that abnormal state,
An object of the present invention is to provide a load control method and device for an auxiliary cooling system of a power plant that can prevent abnormal expansion.

[Outline of Invention]

The first invention of the present invention is, as described in claim 1, for monitoring an abnormality of an auxiliary cooling water system, an abnormality of an auxiliary cooling seawater system, and an abnormality of a heat exchanger array, Of the auxiliary cooling water system, the auxiliary cooling seawater system and the heat exchanger array,
When an abnormality occurs in at least one of them, the auxiliary cooling capacity and the actual plant load are compared, and it is determined whether or not the plant operation can be continued.Based on this judgment result, the plant load is adjusted within the range of the auxiliary cooling capacity. That is, when the abnormality of the heat exchanger row occurs, it is characterized by blocking the inflow of cooling water and cooling seawater to the abnormal heat exchanger. When an abnormality occurs in any of the heat exchangers of the exchanger, the operating time in the abnormal state can be shortened and the abnormality can be prevented from spreading.

Furthermore, the second invention of the present invention is defined by the scope of claim 3
As described in the section, an abnormality monitoring device that monitors an abnormality of the auxiliary cooling water system, an abnormality of the auxiliary cooling seawater system, and an abnormality of the heat exchanger array, a plant load detection device that detects an actual plant load, and the auxiliary device. Randomness judgment to determine whether or not to continue plant operation by comparing the auxiliary equipment cooling capacity with the actual plant load when an abnormality occurs in at least one of the machine cooling water system, the auxiliary cooling seawater system, and the heat exchanger array And a plant load control device that adjusts the plant load within the range of the auxiliary cooling capacity based on the determination result from the Ranbakku determination device, when an abnormality occurs in the heat exchanger array, cooling water for the abnormal heat exchanger and The present invention is characterized in that a cooling seawater outlet, an inlet valve closing outlet, and an inlet valve control device are provided. With this configuration, the method according to the first aspect of the invention can be surely implemented.

Example of Invention

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an apparatus for carrying out the method of the present invention, showing an example applied to a nuclear BWR plant, and FIG. 2 shows a control logic of the example shown in FIG. .

The apparatus of the embodiment shown in FIG. 1 includes an auxiliary cooling water system,
It is provided with a heat exchanger array, an auxiliary equipment cooling seawater system, and a load control device.

The auxiliary cooling water system includes a cooling water pump 1, a fresh water inlet pipe 2 connecting the cooling water pump 1 and a heat exchanger row, and a heat exchanger bypass pipe 3.
A temperature control valve 6, a fresh water outlet pipe 5 connecting the heat exchanger array and the temperature control valve 6, a temperature controller 7, and the temperature control valve 6
And a fresh water pipe 8 that connects the cooling target device 9 with the device to be cooled 9. The cooling water pump 1 is installed [33% capacity × 3 units].

The heat exchanger array is configured by installing [33% capacity × 3 units]. Each heat exchanger 4 is provided with a differential pressure detector 23 that detects the differential pressure between the inlet side and the outlet side thereof.

The accessory cooling seawater system has a cooling seawater pump 10, a seawater inlet pipe 11 connecting the pump and a heat exchanger row, and a seawater outlet pipe 12 connected to an example of a heat exchanger. The cooling seawater pump 10 is installed [33% capacity × 3 units]. The seawater inlet pipe 11 is provided with a temperature detector 24.

The load control device is an abnormality monitoring device 21 for the auxiliary cooling water system.
An auxiliary equipment cooling seawater system abnormality monitoring device 22, a differential pressure detector 23 provided in each heat exchanger 4, and the seawater inlet pipe 11
Temperature detector 24 and plant load detector 25
A random number determination device 26 and a plant load control device 27.

The auxiliary equipment cooling water system abnormality monitoring device 24 monitors the abnormality of the cooling water pump 1 and outputs the number of operating cooling water pumps 1 to the random number judging device 26 when the abnormality occurs.

The abnormality monitoring device 22 for the auxiliary cooling seawater system monitors the abnormality of the cooling seawater pump 10 and, when an abnormality occurs, a random back judging device.
The number of operating cooling seawater pumps 10 is output to 26.

The differential pressure detector 23 detects the differential pressure between the inlet side and the outlet side of the heat exchanger 4 and outputs the detected value to the random determination device 26, and the differential pressure detector 23 detects the differential pressure. The abnormalities in No. 4 and the number of operating vehicles can be understood.

The temperature detector 24 detects the temperature of the cooling seawater flowing through the seawater inlet pipe 11 and outputs the detected value to the random checker 26.

The plant load detection device 25, the actual plant load of the power plant in operation is detected by the generator output, reactor feed water flow rate or high pressure turbine first stage post pressure, etc., so that the detected value is output to the Rambak judgment device 26. I'm running.

The random checker 26 is configured as follows. That is, as can be seen from FIG. 2, (1) The number of operating cooling water pumps 1 is input from the abnormality monitoring device 21 for the auxiliary cooling water system when an abnormality occurs, the auxiliary equipment cooling capacity is determined, and the plant load is detected. Compare with the actual plant load input from the device 25, determine whether to continue the current operation,
The determination result is output to the plant load control device 27.

(2) Auxiliary equipment From the abnormality monitoring device 22 for the cooling seawater system, input the number of operating cooling seawater pumps 10 when an abnormality occurs, and supplement with the operating number and the detected value of the cooling seawater temperature input from the temperature detector 24. The machine cooling capacity is determined, the actual plant load input from the plant load detection device 25 is compared, it is determined whether or not the current operation can be continued, and the determination result is output to the plant load control device 27.

(3) The detected value of the differential pressure between the inlet side and the outlet side of the heat exchanger 4 is input from the differential pressure detector 23, and the abnormality of the heat exchanger 4 is detected from this detected value. 4 and the cooling capacity of the auxiliary equipment based on the detected value of the cooling seawater temperature input from the temperature detector 24, and the plant load detection device 25
The actual load of the plant is compared with the actual load of the plant to determine whether the current operation can be continued.
Output to 27.

The random determination unit 26 is capable of simultaneously performing the processes (1) to (3).

The plant load control device 27 is the random determination device.
Enter the 26 judgment results, and if the operation is continuous based on the judgment results, the power plant is operated as it is, and if it is necessary to reduce the plant load, the reactor recirculation is performed. The reactor is backed up by a pump, etc. to reduce the plant load and continue the operation.

Next, one embodiment of the method of the present invention will be described with reference to the operation of the apparatus of the above embodiment.

In the accessory cooling water system, the cooling water is boosted by the cooling water pump 1, the cooling water passes through the fresh water inlet pipe 2, is cooled by each heat exchanger 4, passes through the fresh water outlet pipe 5, and is controlled by the temperature control valve 6. The temperature is adjusted, and the water is sent to the equipment 9 to be cooled through the fresh water pipe 8 to cool the plant accessories. And
The cooling water whose temperature has risen by cooling the plant accessories is returned to the cooling water pump 1 again.

On the other hand, in the auxiliary cooling seawater system, the cooling seawater is boosted by the cooling seawater pump 10, the cooling seawater is sent to each heat exchanger 4 through the seawater inlet pipe 11, cools each heat exchanger 4, and heats the heat exchanger 4. The cooled seawater whose temperature has risen in the exchanger 4 is discharged from the seawater outlet pipe 12 to the discharge channel.

In the temperature control valve 6, the cooling water cooled in the heat exchanger row and sent from the fresh water outlet pipe 5, and the uncooled cooling water sent from the cooling water pump 1 through the heat exchanger bypass pipe 3. Mix with.

In the temperature controller 7, the temperature of the cooling water passing through the fresh water pipe 8 is detected and the temperature control valve 6 is controlled to cool the cooling water sent from the fresh water outlet pipe 5 and the heat exchanger bypass pipe 3.
The flow rate of the uncooled cooling water sent from is adjusted to the temperature of the cooling water required by the equipment to be cooled 9.

During that time, the abnormality monitoring device 21 monitors the abnormality of the auxiliary cooling water system, the abnormality monitoring device 22 monitors the abnormality of the auxiliary cooling seawater system, and each differential pressure detector 23 is connected to the inlet side of the heat exchanger 4. The differential pressure between the outlet sides is detected and the detected value is output to the runback determination unit 26, and the temperature detector 24 detects the cooling seawater temperature and the detected value is output to the runback determination unit 26. Further, the plant load detection device 25 detects the actual plant load of the power generation plant in operation and outputs the detected value to the random checker 26.

When an abnormality occurs in at least one of the cooling water pump 1, the cooling seawater pump 10 and the heat exchanger 4,
The load control device functions as follows. That is, when the cooling water pump 1 trips, the abnormality monitoring device 21 of the auxiliary cooling water system outputs the number of operating cooling water pumps 1 to the random checker 26. The random determination device 26
Determines the auxiliary equipment cooling capacity from the number of operating cooling water pumps 1 input from the abnormality monitoring device 21 for the auxiliary equipment cooling water system,
Then, it compares the actual plant load input from the plant load detection device 25, and outputs a signal of continuous operation to the plant load control device 27 if the load that can continue operation is large, and conversely if it is small, the plant load control device 27 to the plant load. Outputs a signal to reduce the load to a value that allows continuous operation.

In this case, if there is no abnormality in the heat exchanger example and the auxiliary cooling seawater system, the cooling water temperature is adjusted to the required temperature by the temperature control valve 6 and the temperature controller 7 regardless of the cooling seawater temperature. Therefore, the control based on the cooling seawater temperature is not required.

When the cooling seawater pump 10 trips, the auxiliary equipment cooling seawater system abnormality monitoring device 22 outputs the number of operating cooling seawater pumps 10 to the runback judging device 26. The runback determination device 26 determines the auxiliary equipment cooling capacity from the number of operating the cooling seawater pump 10 and the cooling seawater temperature input from the temperature detector 24, and then the actual plant load input from the plant load detection device 25. If the load that can continue operation is large, a signal to continue operation is output to the plant load controller 27, and if it is small, a signal is output to the plant load controller 27 to reduce the plant load to a load that can continue operation. To do.

Here, the reason for inputting the cooling seawater temperature to the runback determination device 26 is that even if the cooling seawater flow rate by the trip of the cooling seawater pump 10 decreases, if the cooling seawater temperature is sufficiently low, the auxiliary equipment cooling capacity increases. Because.

When the cooling thin tubes of the heat exchanger 4 are closed or broken, the differential pressure between the inlet side and the outlet side of the heat exchanger 4 is abnormally reduced. Therefore, the differential pressure of each heat exchanger 4 is detected by each differential pressure detector 23, and the detected value is used as a random determination device.
The abnormality of the heat exchanger 4 can be detected by outputting to the 26 and monitoring by the random checker 26. Therefore, when the random determination device 26 determines an abnormality in the heat exchanger 4, it determines the auxiliary equipment cooling capacity from the number of operating heat exchangers 4 and the cooling seawater temperature input from the temperature detector 24, and then Compared with the actual plant load input from the plant load detection device 25, if the load that can be continued operation is large, output a signal of continuation of operation to the plant load control device 27, and conversely, if it is small, set the plant load to the plant load control device 27. A signal is output to reduce the load to the extent that operation can be continued.

Here, the reason why the cooling seawater temperature is input to the Ranbak determination device 26 is that only the heat exchanger 4 is abnormal or the cooling seawater pump 10 and the heat exchanger 4 are abnormal. This is because even if the flow rate of cooling seawater decreases due to the trip, if the temperature of the cooling seawater is sufficiently low, the cooling capacity of the auxiliary machinery will increase.

The plant load control device 27 inputs the determination result of whether or not the operation can be continued from the random checker 26, and if the current operation can be continued, it is necessary to continue the operation as it is and reduce the plant load. In some cases, a control signal is output to the reactor recirculation pump or the like to carry out reactor reversion, reduce the plant load, and then continue the plant operation.

As can be understood from the above description, according to this embodiment, in the auxiliary machine cooling system having no reserve capacity, among the auxiliary machine cooling water system, the auxiliary machine cooling seawater system, and the heat exchanger array,
Even when an abnormality occurs in at least one of them, it is possible to continue the operation of the power generation plant within the range of the auxiliary equipment cooling capacity.

Next, FIG. 3 shows another embodiment of the apparatus for carrying out the method of the present invention.

As shown in FIG. 3, a flow rate detector 31 is provided at the outlet of the cooling water pump 1 as an abnormality monitoring device for the auxiliary cooling water system, and an outlet of the cooling seawater pump 10 is provided as an abnormality monitoring device for the auxiliary cooling seawater system. Is provided with another flow rate detector 32. Further, a fresh water inlet valve 33 and a fresh water outlet valve 34 are provided at the fresh water inlet portion and the fresh water outlet portion of each heat exchanger 4, and a sea water inlet valve 35 is provided at the sea water inlet portion and the sea water outlet portion of each heat exchanger 4. A seawater outlet valve 36 is provided. Further, the outlet / inlet valve control device 37 of the heat exchanger 4 is connected to the random determination device 26.

Then, the runback determination device 26 determines the trip of the cooling water pump 1 based on the decrease in the outlet flow rate of the cooling water pump 1 input from the flow rate detector 31, and the outlet flow rate of the cooling seawater pump 10 input from the other flow rate detector 32. The trip of the cooling seawater pump 10 is determined based on the decrease of. Also, a random checker
In 26, when the abnormality of the heat exchanger 4 is determined from the detection value from each differential pressure detector 23, the outlet / inlet valve control device of the heat exchanger 4
Outputs the detection signal of abnormal heat exchanger generation to 37.

The outlet / inlet valve control device 37 of the heat exchanger 4 inputs the detection signal from the Ranbak judgment device 26, and outputs the fresh water inlet valve 33, the fresh water outlet valve 34, the seawater inlet valve 35 and the seawater outlet valve of the abnormal heat exchanger. 36 is closed to prevent the inflow of cooling water and cooling seawater.

Therefore, according to the embodiment shown in FIG. 3, the operating time of the heat exchanger 4 in the abnormal state can be shortened and the abnormal expansion can be prevented, whereby, for example, the cooling thin tubes of the heat exchanger 4 can be prevented. It is possible to prevent rupture of other sound cooling thin tubes due to jetting of fluid from the fracture surface due to rupture of.

〔The invention's effect〕

According to the first aspect of the present invention, the abnormality of the auxiliary cooling water system, the abnormality of the auxiliary cooling seawater system, and the abnormality of the heat exchanger array are monitored to detect the auxiliary cooling water system and the auxiliary equipment. When an abnormality occurs in at least one of the cooling seawater system and the heat exchanger array, the auxiliary equipment cooling capacity is judged, this auxiliary equipment cooling capacity is compared with the actual plant load, and it is judged whether or not the plant operation can be continued. The plant load is adjusted within the range of the auxiliary equipment cooling capacity based on this determination result, and the inflow of cooling water and cooling seawater to the abnormal heat exchanger is blocked when an abnormality occurs in the heat exchanger array. Therefore, if an abnormality occurs in any of the multiple heat exchangers that make up the heat exchanger array, there is a special effect that the operating time in the abnormal state can be shortened and the abnormal expansion can be prevented. .

Further, according to the second aspect of the present invention, an abnormality monitoring device that monitors an abnormality in the auxiliary cooling water system, an abnormality in the auxiliary cooling seawater system, and an abnormality in the heat exchanger array, and a plant that detects an actual plant load The load detection device, the auxiliary cooling water system, the auxiliary cooling seawater system, and the heat exchanger array, when an abnormality occurs in at least one, the auxiliary cooling capacity and the actual plant load are compared to continue plant operation. Ranbakku determiner to determine the availability of, the plant load control device that adjusts the plant load within the range of the auxiliary cooling capacity based on the determination result from the Ranbakku determiner, when an abnormality occurs in the heat exchanger row, abnormal Since the cooling water and the cooling seawater for the heat exchanger, the outlet for closing the inlet valve, and the inlet valve control device are provided, there is an effect that the first invention can be surely implemented.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of an apparatus for carrying out the method of the present invention, FIG. 2 is a diagram showing the same control logic, and FIG. 3 is a system showing another embodiment of an apparatus for carrying out the method of the present invention. Figure, 4th
The figure is a system diagram showing the prior art. 1 ... Cooling water pump, 4 ... Heat exchanger, 6 ... Temperature control valve, 7 ... Temperature controller, 9 ... Equipment to be cooled, 10 ... Cooling seawater pump, 21 ... Auxiliary equipment cooling water system Abnormality monitoring device, 22
...... Auxiliary equipment cooling seawater system abnormality monitoring device, 23 …… Differential pressure detector between inlet and outlet sides of heat exchanger, 24 …… Cooling seawater temperature detector, 25 …… Plant load detection device, 26 ...... Ranbak judgment device, 27 ...... Plant load control device, 31 …… Cooling water pump outlet flow rate flow rate detector, 32 …… Cooling seawater pump outlet flow rate flow rate detector, 33 …… Heat exchanger fresh water Inlet valve, 34 …… same fresh water outlet valve, 35 …… same seawater inlet valve, 36 ……
The same seawater outlet valve, 37 …… outlet and inlet valve control device.

Claims (6)

[Claims] 1. A cooling water is sent from an auxiliary cooling water system to a heat exchanger, while a cooling seawater is sent from an auxiliary cooling seawater system to a heat exchanger row, and the cooling water is cooled by the cooling seawater. In the auxiliary machine cooling system of the power plant that sends water to the equipment to be cooled and cools the auxiliary machines, the abnormality of the auxiliary machine cooling water system, the abnormality of the auxiliary machine cooling seawater system, and the abnormality of the heat exchanger array The auxiliary equipment cooling capacity is monitored and the auxiliary equipment cooling capacity is judged when an abnormality occurs in at least one of the auxiliary equipment cooling water system, the auxiliary equipment cooling seawater system and the heat exchanger array, and the auxiliary equipment cooling capacity and the actual plant load are To determine whether to continue plant operation,
Based on this determination result, while adjusting the plant load within the range of auxiliary equipment cooling capacity, when the abnormality of the heat exchanger row occurs, the inflow of cooling water and cooling seawater to the abnormal heat exchanger is prevented. Control method for auxiliary cooling system of power plant. 2. The abnormality of the auxiliary cooling water system is monitored by the outlet flow rate of the cooling water pump, and the abnormality of the auxiliary cooling seawater system is monitored by the outlet flow rate of the cooling seawater pump according to claim 1. Then, the load control method for the auxiliary cooling system of the power plant is characterized in that the abnormality of the heat exchanger array is monitored by the differential pressure between the inlet side and the outlet side of each heat exchanger. 3. An auxiliary machine cooling water system for sending cooling water to equipment to be cooled of a power plant, an auxiliary machine cooling seawater system for sending cooling seawater for cooling the cooling water, and a heat exchanger for the cooling water and the cooling seawater. An auxiliary cooling system of a power plant including a row, an abnormality monitoring device for monitoring an abnormality of the auxiliary cooling water system, an abnormality of the auxiliary cooling seawater system, and an abnormality of the heat exchanger row, and an actual plant load The plant load detection device for detecting the, the auxiliary cooling water system, the auxiliary cooling seawater system and the heat exchanger row, when comparing the auxiliary cooling capacity and the actual plant load when an abnormality occurs in at least one A runback determiner that determines whether or not the plant operation can be continued, a plant load controller that adjusts the plant load within the range of the auxiliary cooling capacity based on the determination result from the runback determiner, and the heat exchanger array When an abnormality occurs Out of the cooling water and the cooling sea water to an abnormal heat exchanger, leaving close the inlet valve, the power plant is characterized by providing an inlet valve controller auxiliary cooling system of the load control device. 4. The abnormality monitoring device for the auxiliary cooling water system according to claim 3, comprising a flow rate detector at the outlet of the cooling water pump, and the abnormality monitoring device for the auxiliary cooling seawater system is cooling. It has a flow rate detector at the outlet of the seawater pump, and the abnormality monitoring device of the heat exchanger array is configured to have a differential pressure detector between the inlet side and the outlet side of each heat exchanger. Load control device for auxiliary cooling system of power plant. 5. An auxiliary cooling water system for sending cooling water to equipment to be cooled in a power plant, an auxiliary cooling seawater system for sending cooling seawater for cooling the cooling water, and a heat exchanger for the cooling water and cooling seawater. An auxiliary cooling system of a power plant including a row, an abnormality monitoring device for monitoring an abnormality of the auxiliary cooling water system, an abnormality of the auxiliary cooling seawater system, and an abnormality of the heat exchanger row, and an actual plant load The plant load detection device for detecting the, the auxiliary cooling water system, the auxiliary cooling seawater system and the heat exchanger row, when comparing the auxiliary cooling capacity and the actual plant load when an abnormality occurs in at least one , A runback determiner for determining whether or not the plant operation can be continued, and a plant load control device for adjusting the plant load within the range of the auxiliary cooling capacity based on the determination result from the runback determiner, and the abnormality of the heat exchanger array When it occurs Out of the cooling water and the cooling sea water to an abnormal heat exchanger, leaving close the inlet valve, the power plant is characterized by providing an inlet valve controller auxiliary cooling system of the load control device. 6. The abnormality monitoring device for the auxiliary cooling water system according to claim 5, wherein the abnormality monitoring device for the auxiliary cooling water system has a flow rate detector at the outlet of the cooling water pump, and the abnormality monitoring device for the auxiliary cooling seawater system is cooling. It has a flow rate detector at the outlet of the seawater pump, and the abnormality monitoring device of the heat exchanger array is configured to have a differential pressure detector between the inlet side and the outlet side of each heat exchanger. Load control device for auxiliary cooling system of power plant.