JPH05312303A - Water supply control device - Google Patents

Abstract

PURPOSE:To provide a water supply control device having means capable of performing an automatic energization of a preliminary water supplying pump and capable of positively preventing a trip of a plant even in the case that a part of an internal circuit of the water supply control device itself such as a water supplying pump control signal generating circuit and the like CONSTITUTION:A trouble discriminating means 23A automatically energizes water supplying pumps 16c and 16d driven by an electrical motor as a trouble signal 22a of a water supplying pump control signal generating circuit 12a is outputted, thereafter closes a steam stop valve 24a corresponding to the troubled water supplying pump control signal generating circuit 12a and causes a water supplying pump 16a driven by a turbine to be stopped. With such an arrangement, even in the case of trouble of the water supplying control device, the operation can be continued without stopping the plant or reducing its output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply control device in a plant using water such as a thermal power plant or a nuclear power plant, and particularly to a control signal generating circuit or the like in the water supply control device for controlling a water supply pump. Even if it does, it relates to a water supply control means suitable for switching and operating the water supply pump so as not to stop the plant.

[0002]

2. Description of the Related Art Conventionally, for example, JP-A-62-84204
In the No. 1, the control means for tripping the turbine-driven water supply pump is provided when the rotation speed signal of the drive turbine of the turbine-driven water supply pump of the plant is abnormal.

However, considering the complexity of the recovery work after the trip and the reduction of the operating rate of the facility, it is desirable that the trip be avoided and the operation be continued while ensuring the safety.

[0004]

Therefore, for example, in Japanese Unexamined Patent Publication No. 62-98102, only when a turbine driven feed water pump fails, a backup electric motor driven feed water pump is automatically started to continue the plant operation. Proposing a method.

However, the water supply control device of Japanese Patent Laid-Open No. 62-98102 automatically activates the backup electric motor driven water supply pump only when the turbine driven water supply pump fails. When the water supply pump control signal generation circuit in the water supply control device that generates the command signal to the water supply control valve located on the discharge side of the valve drive device or the water supply pump fails, the backup motor drive water supply pump is automatically activated. Since there is no start-up, there is a problem that the feed water flow rate decreases, for example, the water level of the reactor drops and the plant shuts down.

On the other hand, Japanese Patent Laid-Open No. 57-179505 discloses a two-loop control system consisting of a main loop control system for controlling the water level and a minor loop control system for controlling the flow rate, with a standby system for the main loop control system only. , Usually used 2
When the loop control system becomes abnormal, we propose a method to switch to the standby system.

Also in this case, when the feed water pump control signal generating circuit itself fails, the standby system cannot be automatically switched, so that the feed water flow rate decreases, for example, the water level of the reactor decreases, and the plant stops. There was a problem.

An object of the present invention is to automatically start a backup water supply pump even if a part of an internal circuit of the water supply control device itself, such as a water supply pump control signal generation circuit, fails to ensure a trip of a plant. An object of the present invention is to provide a water supply control device provided with a preventable means.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention incorporates a water level signal, a feed water flow rate signal, a main steam flow rate signal, etc. of a plant to calculate a necessary feed water quantity and the like, and a calculating means. And a plurality of water supply pump control signal generation means for calculating the control amount of the drive means of each water supply pump based on the output of each of the water supply pumps and outputting the respective control signals. In a water supply control device operating as a regular system, a means for detecting any failure of the water supply pump control signal generating means, and a water supply pump of the standby system based on the failure signal of the water supply pump control signal generating means from the failure detecting means. The present invention proposes a water supply control device provided with means for activating.

In order to achieve the above object, the present invention is based on a means for taking in a water level signal, a feed water flow rate signal, a main steam flow rate signal, etc. of a plant and computing a necessary feed water quantity, etc., and an output of the computing means. And a plurality of water supply pump control signal generating means for calculating the control amount of the drive means of each water supply pump and outputting respective control signals, and operating some water supply pumps as a standby system and the remaining water supply pumps as a regular system In the water supply control device, the means for detecting a failure of one of the water supply pump control signal generating means and the corresponding water supply pump in the service system are stopped based on the failure signal of the water supply pump control signal generating means from the failure detecting means. The present invention proposes a water supply control device including means for starting a water supply pump of a standby system.

When starting the water supply pump of the standby system, the corresponding water supply pump in the service system is stopped based on the failure signal of the water supply pump control signal generation means from the failure detection means, and the failure signal and this stop condition are set. As a result, the standby water supply pump can be activated. On the contrary, the standby water pump is started based on the failure signal of the water pump control signal generation means from the failure detection means, and the failed water pump control signal generation means is conditioned on the failure signal and this start. You may make it stop the water supply pump corresponding to.

In any case, the failure detecting means of the water supply pump control signal generating means is provided when the rate of change of the input and / or output signals of the water supply pump control signal generating means exceeds a predetermined value, or When the magnitude of the deviation between the input signal and the output signal of the pump control signal generating means exceeds a predetermined value, or the magnitude of each deviation between the output signals of the water supply pump control signal generating means exceeds the predetermined value. At this time, a means for outputting a failure detection signal is used.

[0013]

In the present invention, the water supply control device is provided with a rate of change of the input signal and / or the output signal of each water supply pump control signal generation circuit in the water supply control device, the inlet / outlet of the input / output interface constituting the water supply control device. The deviation between the output side signal and the outlet side signal, the deviation between the output signals of the feed water pump control signal generating circuits, and the like are monitored, and when there is a significant change, a failure signal is output.

The failure determination means fetches those failure signals, automatically stops the water supply pump corresponding to the failed water supply pump control signal generating circuit, and automatically starts the backup water supply pump.

The failure determination means fetches those failure signals, automatically stops the water supply pump corresponding to the failed water supply pump control signal generating circuit, confirms the stop of the water supply pump, and then confirms the standby water supply pump. Start automatically.

On the contrary, the failure determining means fetches those failure signals, automatically activates the auxiliary water supply pump, confirms the activation of the auxiliary water supply pump, and then determines the defective water supply pump control signal generating circuit. Automatically stop the water supply pump corresponding to.

Therefore, in any case, even if a part of the internal circuit of the water supply control device itself such as the water supply pump control signal generating circuit fails, the backup water supply pump is automatically started to ensure the trip of the plant. Can be prevented.

[0018]

Embodiments of the water supply control device according to the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing a system configuration of a first embodiment of a water supply control device according to the present invention. The water supply control device 1 roughly includes a main control circuit 11 and water supply pump control signal generation circuits 12a to 12d.

The water supply controller 1 has an input interface 5
The reactor water level signal 2, the feed water flow rate signal 3, and the main steam flow rate signal 4 are taken in through a to 5c, respectively. The adder 7a of the water supply control device 1 compares the reactor water level signal 2 with the setting signal of the reactor water level setting device 46, and outputs the deviation thereof.
On the other hand, the adder 7b compares the feed water flow rate signal 3 with the main steam flow rate signal 4 and outputs the deviation. The adder 7c adds the deviation output from the adder 7a and the deviation output from 7b, and outputs the result to the control calculator 8. Control calculator 8
Calculates the required amount of water supply based on the output signal of the adder 7c and outputs it to the water supply pump control signal generation circuits 12a to 12d.

Water supply pump control signal generation circuits 12a-12
d is the mode switch 9a-9d for the manual / automatic mode based on the signal from the manual increase / decrease controller 10a-10d.
To operate. The output signal from the control calculator 8 is taken into the feed water pump control signal generation circuits 12a to 12d only while the mode changers 9a to 9d are switched to the a side. The adders 7d to 7g take in the outputs of the mode changers 9a to 9d and the pump flow rate signals 17a to 17d taken in via the input interfaces 5d to 5g, respectively, calculate the deviations, and give the deviation signals to the controllers 11d to 11g. Is output.

The controllers 11d to 11g are adders 7d to 7d.
Based on the deviation signal from g, the water supply pumps 16a to 16a
Create a control signal of d. The controllers 11d and 11e are provided with the steam control valve drive devices 6a and 6 via the output interfaces 13d and 13e and the input interfaces 5h and 5i.
The control signal is output to b. Steam control valve drive device 6a, 6
b creates a signal that determines the opening degree of the steam control valves 14a and 14b that control the amount of steam supplied to the turbines 15a and 15b that drive the turbine-driven feed water pumps 16a and 16b. The control valves 14a and 14b are controlled. Controller 11f, 11g
Outputs a control signal to the water supply adjusting valves 19c and 19d installed on the outlet side of the electric motor driven water supply pumps 16c and 16d.

Of the water supply pumps 16a to 16d, the turbine drive water supply pumps 16a and 16b each have a capacity of 50% of the rated capacity, and are driven by the turbines 15a and 15b, respectively. The amount of steam supplied to the turbines 15a and 15b is adjusted by the steam control valves 14a and 14b. Pump drive turbines 15a, 1 for adjusting the amount of steam
When the rotation speed of 5b is changed, the turbine driven feed pump 16
The discharge flow rates of a and 16b can be controlled.

On the other hand, the electric motor driven water supply pumps 16c, 16
One d has a capacity of 25% of the rated capacity. Electric motor 2
The circuit breakers 21c and 21d of 0c and 20d are turned on, and based on the control signal from the water supply controller 1, the water supply adjusting valve 19c,
If the opening of 19d is adjusted, the electric motor driven water supply pump 16
The discharge flow rates of c and 16d can be controlled. Water supply pump 16a
The water sent from ~ 16d is the check valves 18a-18d.
Through, for example, water is supplied to the reactor.

Next, the operation of the water supply control device of FIG. 1 thus constructed will be described. 25 load from plant start
Up to 25%, one electric motor driven water supply pump is operated, and up to 25 to 50% load, one turbine driven water supply pump is operated instead of the electric water supply pump, and load is 5%.
From 0 to 100%, two turbine driven feed water pumps are operated.

(1) << From Plant Start-up to 25% Load >> In this state, only the motor-driven water supply pump, for example 16c, is operated. The mode switch 9c for the electric motor drive water supply pump 16c is on the automatic side, that is, the ac side, and the same value as the output of the controller 8 is output from the mode switch 9c.

On the other hand, another electric motor driven water supply pump 16d
Is in a standby state although it is stopped, the mode switch 9d is on the automatic side, that is, the ac side,
The same value as the output of the controller 8 is output from the mode switch 9d. Therefore, the water supply control valve 19d of the electric water supply pump in the standby state is always controlled.

In such a state, if a failure occurs in the water supply pump control signal generating circuit 12c itself which regulates the flow rate of the electric motor drive water supply pump 16c in operation, the failure signal 2
2c is output. In response to the failure signal 22c, the circuit breaker 21d of the driving electric motor 20d of the electric motor driving water supply pump 16d in the standby state is turned on, the driving electric motor 20d is automatically activated, and the electric motor driving water supply pump 16d takes over the water supply.

At this time, the turbine driven water supply pump 16a
And 16b are stopped, and the mode selectors 9a, 9b
Is on the manual side, that is, on the bc side, and the mode switch 9a,
The output signal of 9b is "0".

(2) << Plant load 25% to 50% >> In this state, one turbine drive feed water pump, for example, 16a, is operating, so the mode switch 9a is on the automatic side, that is, the ac side. , The same value as the output of the controller 8
It is output from the mode switch 9a. The mode switch 9b of the turbine-driven feed water pump 16b which is stopped is on the manual side, that is, the bc side, and this output signal is "0".
Has become.

On the other hand, the water supply control valves 19c and 19d of the electric motor driven water supply pumps 16c and 16d in the standby state.
Is always under control.

In this state, the feed water pump control signal generating circuit 12a of the turbine driven feed water pump 16a in operation.
When a failure occurs, the failure signal 22a is output, the breakers of the driving electric motors 20c and 20d of the electric motor driven water feed pumps 16c and 16d in the standby state are turned on, and the electric motors 20c and 20d for driving are automatically activated to drive the electric motor. The water supply pumps 16c and 16d take over the water supply.

(3) << Plant load 50 to 100% >> In this state, the turbine drive water feed pumps 16a and 1
Since the two 6b are in operation, the mode selectors 9a and 9b are on the automatic side, that is, the ac side, and the same value as the output of the controller 8 is output from the mode selectors 9a and 9b.

On the other hand, the mode changers 9c and 9d of the electric motor driven water supply pumps 16c and 16d in the standby state.
Is also on the automatic side, that is, the ac side, and the same value as the output of the controller 8 is output from the mode switching devices 9c and 9d, so that the water supply control valves 19c and 19d are always controlled. ..

In such a state, when the feedwater pump control signal generating circuit 12a or 12b of the turbine driven feedwater pump 16a or 16b in operation fails, the failure signal 22
a or 22b is output and the electric motors 20c and 2 for driving the electric motor drive water supply pumps 16c and 16d in the standby state are output.
The 0d circuit breaker is turned on and it automatically starts.

In addition to the turbine driven water supply pumps 16a and 16b, the turbine driven water supply pump 16a (16
The failure signal 22c (22d) in (b) causes the electric motor 20 for driving the electric motor drive water supply pump 16d (16c) in standby.
Of course, the circuit breaker 21d (21c) of d (20c) may be turned on, the driving electric motor 20d (20c) may be automatically started, and the electric motor driven water supply pump 16d (16c) may be used to supply water. Is.

According to the water supply control device of FIG. 1, even if any of the water supply pump control signal generating circuits 12a to 12d itself fails, as long as the mechanical system of the water supply pump and its driving means is sound, the failed signal is generated. Water supply by the water supply pump controlled by the generation circuit is replaced by another water supply pump,
It is possible to prevent a trip due to a failure of the water supply pump control signal generation circuits 12a to 12d themselves.

FIG. 2 shows a second embodiment of the water supply control device according to the present invention.
FIG. 3 is a block diagram showing the system configuration of the embodiment, and FIG. 3 is a logic diagram showing an example of the judgment logic in the failure judgment means 23A such as the feed water pump control signal generation circuit.

In the embodiment shown in FIG. 2, a failure determining means 23A such as a water supply pump control signal generating circuit is added to the embodiment shown in FIG. 1, and a turbine steam stop valve for driving a water supply pump is provided in series with the steam control valves 14a and 14b. In this example, 24a and 24b are installed respectively. Each water supply pump control signal generation circuit 1 is provided in the failure determination means 23A such as the water supply pump control signal generation circuit.
The failure signals 22a to 22d from 2a to 12d and the stop signals 26a and 26b from the turbine driven water feed pump are input. If the specified failure condition is met,
Turbine steam stop valve 24 for driving water feed pumps of a and b systems
The fully closed command signals 25a and 25b are output to a and 24b, and the closing command signal 27 is output to the circuit breakers 21c and 21d.
c and 27d are output.

The failure determining means 23A such as the feed water pump control signal generating circuit in FIG. 3 is ORed with the AND circuits 29a and 29b.
It is composed of circuits 30a to 30c. For example, the water supply pump control signal generation circuit 12a of the system a fails and the failure signal 22
When "a" is output, the fully closed command 25a is output to the feedwater pump driving turbine steam stop valve 24a. This fully closed command 2
When the turbine drive water supply pump 16a is stopped according to 5a, the stop signal 26a is fetched. As a result, AN
The output of the D circuit 29a becomes "1", and the OR circuit 30a ...
The output of 30c also becomes "1". Therefore, the failure determination unit 23A can simultaneously output the closing commands 27c and 27d for the c and d systems, that is, the electric water supply pump motor circuit breakers 21c and 21d, and automatically start the two electric water supply pumps 16c and 16d. it can.

In the case of this embodiment, the water supply pump corresponding to the faulty water supply pump control signal generating circuit is stopped and then the water supply pump on standby is started.

FIG. 4 shows a third embodiment of the water supply control device according to the present invention.
FIG. 5 is a block diagram showing a system configuration of the embodiment, and FIG. 5 is a logic diagram showing an example of judgment logic in the failure judgment means 23B such as the feed water pump control signal generation circuit.

The embodiment of FIG. 4 is also similar to the embodiment of FIG.
A fault determining means 23B such as a feed water pump control signal generating circuit is added to the embodiment of FIG. 1, and the steam control valve 14a,
Turbine steam stop valve 24 for driving a water supply pump in series with 14b
In this example, a and 24b are installed. The failure determination means 23B such as the water supply pump control signal generation circuit has a failure signal 2 from each of the water supply pump control signal generation circuits 12a to 12d.
2a to 22d and the closed signal 2 of the circuit breakers 21c and 21d of the c and d systems, that is, the electric motor driven water supply pumps 16c and 16d.
8c and 28d are input. When the predetermined failure occurrence condition is satisfied, the closing command signals 27c and 27d are output to the circuit breakers 21c and 21d, and the fully closed command signal is output to the feedwater pump driving turbine steam stop valves 24a and 24b.

The failure determining means 23B such as the feed water pump control signal generating circuit of FIG. 5 is ORed with the AND circuits 29c to 29d.
It is composed of circuits 30d and 30e. For example, the water supply pump control signal generation circuit 12a of the system a fails and the failure signal 22
When "a" is output, the outputs of the OR circuits 30d and 30e become "1", and the closing commands 27c and 27d for the circuit breakers 21c and 21d of the electric motor drive water supply pumps of the c and d systems are simultaneously output, and the electric motor drive water supply pump is output. It is possible to automatically activate the two units 16c and 16d. As a result, when the circuit breakers 21c and 21d are turned on, the motor drive water feed pump activation signals 28c and 28d of the c and d systems are input, and AN
The output of the D circuit 29c becomes "1", and subsequently the output of the AND circuit 29d also becomes "1". Therefore, the fully closed command signal 25a is output to the steam stop valve 24a of the water supply pump driving turbine of the system a, and the water supply pump 16a corresponding to the failed water supply pump control signal generation circuit 12a is stopped.

In the case of the present embodiment, the stand-by water supply pump is started and then the water supply pump corresponding to the faulty water supply pump control signal generating circuit is stopped.

6 to 8 show an embodiment relating to means for detecting a failure and outputting a failure signal to the failure determination means 23 in the water supply control device 1. FIG. 6 is a block diagram showing a system configuration of a fourth embodiment of the water supply control device according to the present invention. The present embodiment shows an example of means for calculating a change rate of an output signal and detecting a failure.

In the embodiment of FIG. 6, the output signal of the manual / automatic mode switch 9a (9b-9d) and the adder 7d.
(7e to 7g) output signal, control calculator 11d (11e
~ 11g) output signal, input interface 5d (5e
.About.5 g) output signal of each change rate calculator 31a.
It is taken into 34a and the rate of change is calculated. When the rate of change of each exceeds a predetermined value, the failure signal 22a (22b) of the a (b to d) feed water pump control signal generation circuit 12a (12b to) is generated.
22d) is output to the alarm setters 35a to 38a and is used for a failure alarm. Further, it is also output to the OR circuit 39a, and as the failure signal 22a (22b to 22d),
It is taken into the failure determination means 23 such as the water supply pump control signal generation circuit.

FIG. 7 shows a fifth embodiment of the water supply controller according to the present invention.
It is a block diagram which shows the system configuration of an Example. The present embodiment shows an example of means for calculating a deviation between an input signal and an output signal at each stage to detect a failure.

Input signal of the input interface 5d (5e-5g) and output interface 13d (13e-1)
The output signal of 3g) is input to the adders 40a and 41a. The adders 40a and 41a calculate the deviation between each input signal and output signal. When each deviation exceeds a predetermined value, a (b to d) feed water pump control signal generation circuit 12
The failure signal 22a (22b to 22d) of a (12b to) is output to the alarm setters 42a and 43a and is used for the failure alarm. Further, it is also output to the OR circuit 44a, and is taken in as a failure signal 22a (22b to 22d) by the failure determination means 23 such as the feed water pump control signal generation circuit.

FIG. 8 shows a sixth embodiment of the water supply control device according to the present invention.
It is a block diagram which shows the system configuration of an Example. This embodiment shows an example of means for calculating a deviation between output signals and detecting a failure.

The output signals of the output interfaces 13d to 13g are input to the signal comparator 45. When the deviation between the output signals is large, the output of the signal comparator 45 is "1". When each deviation exceeds a predetermined value, a (b to d)
The failure signal 22a (22b to 22d) of the water supply pump control signal generation circuit 12a (12b to) is taken in by the failure determination means 23 such as the water supply pump control signal generation circuit.

[0051]

According to the present invention, in a water supply control device of a plant using water such as a thermal power plant or a nuclear power plant, a part of an internal circuit of the water supply control device itself such as a water supply pump control signal generating circuit fails. Even so, since the means for automatically starting the water supply pump on the standby side is provided, it is possible to reliably avoid a trip and a decrease in output of the plant, and it is possible to improve the operating efficiency of the plant.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a first embodiment of a water supply control device according to the present invention.

FIG. 2 is a block diagram showing a system configuration of a second embodiment of the water supply control device according to the present invention.

FIG. 3 is a logic diagram showing an example of judgment logic in a failure judgment means 23A such as a water supply pump control signal generation circuit in the water supply control device of FIG.

FIG. 4 is a block diagram showing a system configuration of a third embodiment of the water supply control device according to the present invention.

5 is a logic diagram showing an example of judgment logic in a failure judgment means 23B such as a water supply pump control signal generation circuit in the water supply control device of FIG.

FIG. 6 is a block diagram showing an example of means for calculating a change rate of an output signal of the water supply control device according to the present invention to detect a failure.

FIG. 7 is a block diagram showing an example of means for detecting a failure by calculating a deviation between an input signal and an output signal at each stage of the water supply control device according to the present invention.

FIG. 8 is a block diagram showing an example of means for calculating a deviation between output signals of the water supply control device according to the present invention and detecting a failure.

[Explanation of symbols]

1 Water supply control device 2 Reactor water level signal 3 Water supply flow signal 4 Main steam flow signal 5a-5g Input interface 6a, 6b Steam control valve drive device 7a-7g Adder 8 Control calculator 9a-9d Mode switch 10a-10d Increase / decrease Operator 11 Main control circuit 12a-12d Water supply pump control signal generation circuit 13d-13i Output interface 14a, 14b Steam control valve 15a, 15b Pump drive turbine 16a-16d Turbine drive water supply pump 17a-17d Flow signal 18a-18d Check Valves 19c, 19d Water supply regulating valves 20c, 20d Electric motors 21c, 21d Circuit breakers 22a-22d Failure signals for water supply pump control signal generation circuit 23A, 23B Failure determination means for water supply pump control signal generation circuit 24a, 24b Turbine steam for water supply pump drive Stop valve 25a, 5b Fully closed command signal 26a, 26b Turbine drive feed water pump stop signal 27c, 27d Closing instruction signal 28c, 28dc, d side electric motor drive feed water pump breaker close signal 29a, 29b AND circuit 30a-30c OR circuit 31a-34a Change Rate calculator 35a to 38a Alarm setter 39a OR circuit 40a Adder 41a Adder 42a Alarm setter 43a Alarm setter 44a OR circuit 45 Signal comparator 46 Reactor water level setter

Claims (7)

[Claims] 1. A means for fetching a water level signal, a feed water flow rate signal, a main steam flow rate signal, etc. of a plant to calculate a necessary feed water quantity and the like, and a control quantity of a driving means of each of the water feed pumps based on the output of the calculating means. And a plurality of water supply pump control signal generating means for calculating respective control signals, and operating a part of the water supply pumps as a standby system and the remaining water supply pumps as a regular system, wherein the water supply A means for detecting a failure of any of the pump control signal generating means, and a means for activating the water pump of the standby system based on the failure signal of the water supply pump control signal generating means from the failure detecting means. Water supply control device characterized by. 2. A means for calculating a required water supply amount, etc. by taking in a water level signal, a feed water flow rate signal, a main steam flow rate signal, etc. of a plant, and a control amount of a drive means of each of the water feed pumps based on the output of the calculation means And a plurality of water supply pump control signal generating means for calculating respective control signals, and operating a part of the water supply pumps as a standby system and the remaining water supply pumps as a regular system, wherein the water supply A means for detecting any failure of the pump control signal generating means, and stopping the corresponding water supply pump in the service system based on the failure signal of the water supply pump control signal generating means from the failure detecting means, and A water supply control device comprising means for activating a standby water supply pump. 3. A means for taking in a water level signal, a feed water flow rate signal, a main steam flow rate signal, etc. of a plant to calculate a necessary feed water quantity, etc., and a control quantity of a drive means of each of the water feed pumps based on the output of the calculating means. And a plurality of water supply pump control signal generating means for calculating respective control signals, and operating a part of the water supply pumps as a standby system and the remaining water supply pumps as a regular system, wherein the water supply Means for detecting any failure of the pump control signal generating means, means for stopping the corresponding water supply pump in the service system based on the failure signal of the water supply pump control signal generating means from the failure detecting means, A water supply control device comprising means for starting a water supply pump of a standby system on condition of the failure signal and the stop. 4. A plant water level signal, a feed water flow rate signal,
A means for taking in the main steam flow rate signal and the like to calculate a necessary water supply amount and the like, and a plurality of water supply pumps for calculating the control amounts of the drive means of the respective water supply pumps and outputting respective control signals based on the output of the calculating means. In a water supply control device including a control signal generating means and operating a part of the water supply pumps as a standby system and the remaining water supply pumps as a regular system, means for detecting a failure of any of the water supply pump control signal generating means. A means for activating a standby water supply pump based on a failure signal of the water supply pump control signal generation means from the failure detection means; and the water supply pump control signal generation means that has failed on the condition of the failure signal and the start-up. And a means for stopping the water supply pump corresponding to the water supply control apparatus. 5. The water supply control device according to claim 1, wherein the failure detection means of the water supply pump control signal generation means is an input and / or output signal of the water supply pump control signal generation means. Is a means for outputting a failure detection signal when the magnitude of the rate of change of the water supply exceeds a predetermined value. 6. The water supply control device according to claim 1, wherein the failure detection means of the water supply pump control signal generation means includes an input signal and an output signal of the water supply pump control signal generation means. Is a means for outputting a failure detection signal when the magnitude of the deviation exceeds a predetermined value. 7. The water supply control device according to claim 1, wherein the failure detection means of the water supply pump control signal generation means is arranged between output signals of the water supply pump control signal generation means. A water supply controller, which is means for outputting a failure detection signal when the magnitude of the deviation exceeds a predetermined value.