JPH1194986A - Reactor feed water controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor feed water controller raised in controllability so as to stably hold reactor water level in switching pumps. SOLUTION: In the manual control system of reactor feed water controller, a pump switching administration controller 1, a correction signal generator 2, a manual setting signal generator 3, a turbine driven feed water pump (T/ DRFP)-B setter 4 and a set value monitor 5 are provided. In an automatic control system, a deviation operator 6, adders 7 and 9, an integration controller 8 and a proportional controller 10 are provided. In switching pumps when the actual discharge flow rate of T/DRFP-B15 reaches a specified value, a correction permission signal is output from the set value monitor 5 to the correction signal generator 2 and a correction signal is output from the correction signal generator 2 to the automatic control system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor water supply control device attached to a water supply pump for boosting the water supply of a reactor water supply system of a nuclear power plant and supplying the water to a nuclear reactor.

[0002]

2. Description of the Related Art A water supply pump plays an important role in supplying water as a secondary coolant of a nuclear reactor. Usually, two types of water supply pumps are used according to the type of power. An electric motor is referred to as an electric motor-driven water supply pump, and a turbine is referred to as a turbine-driven water supply pump. There are two motor-driven water supply pumps (hereinafter referred to as M / DRFPs) in total, each capable of carrying 25% of the water supply flow rate. There are a total of two turbine driven feed pumps (hereinafter referred to as T / DRFP), each of which can carry 50% of the feed water flow rate.

[0003] At the start of a nuclear power plant, sufficient steam for driving the T / DRFP cannot be obtained.
/ DRFP is in charge. Maximum capacity to reactor is 2
M / DRFP, which is 5%, cannot handle more water supply. Since the remaining one M / DRFP is kept as a spare unit, when the plant output exceeds 25%, water is supplied using one T / DRFP having a 50% capacity. Switching. Furthermore, when the plant output exceeds 50%, the second T / DRFP
To increase the water supply so that the plant output becomes 100%, that is, the rated output.

During this time, the pump is switched from one M / DRFP to one T / DRFP, and then to two T / DRFPs.
Can be switched twice. It is necessary to decrease the flow rate of the feedwater pump on the side that is stopped at the time of switching, and increase the flow rate of the feedwater pump on the side that is newly introduced so that a large fluctuation does not occur in the reactor water level. Conventionally, pump switching is performed by a process computer or a manual operation by an operator. A typical example will be described as an example of switching from one T / DRFP to two T / DRFPs at the time of plant startup.

In FIG. 6, the first T / DRFP-A
The water level control means comprises a deviation calculator 41, a proportional controller 42, an integral controller 43, an adder 44, and a T / DRFP-A controller 45. The water level control means of the second T / DRFP-B includes a T / DRFP-B setting unit 46 and a T / DRFP-B.
A B controller 47 is provided.

[0006] In the above configuration, when the pump is switched,
When the T / DRFP-B setting device 46 is manually increased, the discharge amount of the temporary T / DRFP-B increases and the reactor water level l rises as shown in FIG. Due to this rise in water level, the flow request signal given to the T / DRFP-A controller 45 decreases, the flow request signal to the T / DRFP-A decreases, and the flow m of the T / DRFP-A decreases. further,
According to the increase request by the T / DRFP-B setting unit 46, T /
The flow rate n of the DRFP-B increases, and accordingly, the flow rate request signal to the T / DRFP-A decreases in order to suppress the rise of the reactor water level l. The flow rate m of DRFP-A and the flow rate n of T / DRFP-B become the same. At this point, the operation on the T / DRFP-B side is switched from manual operation to automatic control by the main water level controller.

Although the manual operation is performed by an operator, the pump is switched in a process computer in a similar procedure. Further, a method of performing automatic switching according to a programmed procedure has been proposed.

Further, the fluctuation of the reactor water level cannot be avoided by the manual operation as described above. T / DRFP by improving this
There has also been proposed a method of increasing or decreasing the flow rate of T / DRFP-A in accordance with the increase or decrease of the flow rate of -B. This is performed, for example, by a correction signal generator 48 as shown in FIG.
The same amount as T / DRFP-
This is a method of reducing the water level at the A side and keeping the water level fluctuation in the reactor at a minimum. That is, when an increase request is made by the T / DRFP-B setting unit 46, a value obtained by reversing the sign corresponding to the increase is output from the correction signal generator 48 to the water level controller. By limiting the discharge flow rate of T / DRFP-A, T / DRFP-A, T / DRF
The total water supply amount of P-B is controlled so as not to increase or decrease. By incorporating this correction, it is possible to suppress excessive water level fluctuations in the reactor at the time of pump switching. Again, automatic switching according to a programmed procedure has been proposed.

[0009]

However, in the process of increasing the flow rate of T / DRFP-B by setting the flow rate by manual operation, if a correction is applied when the flow rate of T / DRFP-B remains zero, The decrease in the flow rate of T / DRFP-A temporarily increases, and a situation occurs in which the total feedwater flow rate decreases. Therefore, as shown in FIG. 9, the reactor water level temporarily drops as shown by the dotted line, and a stable water level cannot be maintained. Such a condition occurs even if the flow signal increases, especially in the step-up process until the check valve starts to open at the time of startup or the step-down process when the check valve closes at the stop when the check valve is started. The non-linear portion in the relationship between the flow rate setting and the actual flow rate, which does not lead to an increase in the actual flow rate, has a great effect. Therefore, it is necessary to improve this point in order to further improve the controllability.

[0010] In the pump switching, the water supply pump on the starting side or the water supply pump on the stopping side is usually operated by manual setting. However, the operation by the manual setting results in narrowing the range of the automatic control which is indispensable for keeping the reactor water level stable, which hinders maintaining the controllability at a higher level.

For example, when a water supply pump operated by automatic control in conventional program control fails, the flow rate of the water supply pump may not be reduced while the flow rate of the water supply pump is fixed. In this case, the flow rate of the feedwater pump operated manually for program control will increase until it reaches the output of the main water level controller. Under such a situation, the ratio of feedwater which is not originally subject to automatic control becomes large, which hinders control for keeping the reactor water level stable.

Further, in pump switching by the process computer, pump switching is automatically stopped due to occurrence of an abnormality on the plant side, occurrence of a transient event, or the like. However, if the pump switching is stopped in all cases in such a case, most of the pump switching is stopped with the water supply pump operated by manual setting remaining, which is not preferable in stabilizing the reactor water level. It is necessary not to be forced to stop pump switching if there is an abnormality in equipment not directly related to the water supply system, but the current reactor water supply control device cannot meet such demands.

An object of the present invention is to provide a reactor water supply control device having improved controllability so as to maintain the reactor water level more stably when the pump is switched.

[0014]

According to one aspect of the present invention, there is provided a correction signal for outputting a correction signal such that a flow rate request signal is reduced by an amount corresponding to an increase in a manually set signal. A correction value generation unit that outputs a correction permission signal to the correction signal generation unit when an actual discharge amount of another supplied water supply pump reaches a predetermined value.

In the apparatus having the above-described structure, the correction signal from the correction signal generator is cut off only in the portion where the relationship between the flow rate setting and the actual flow rate is non-linear, and the actual discharge flow rate of the supplied water pump is set to a predetermined value. And outputs a correction permission signal when the value reaches the value. The correction signal is taken into the control after the discharge flow rate of the supplied water supply pump is secured,
It is possible to reliably prevent the reactor water level from temporarily dropping into an unstable state.

Further, the invention according to claim 2 is provided with a controller for defining an upper limit of the manual setting signal from the manual setting signal generating section.

In the apparatus having the above-described configuration, a restriction is imposed on the manual setting signal from the manual setting signal generating section so that the limiter does not exceed a certain flow rate in the process of increasing the water supply by the manual setting operation. For this reason, the water supply not subject to the automatic control at the time of switching does not increase so as to exceed the allowable upper limit, and it is possible to prevent the proportion of the water supply not subject to the automatic control from increasing.

According to the third aspect of the present invention, there is provided a switching allowable flow rate calculating unit for calculating an allowable flow rate for pump switching based on the flow rate at the start of pump switching.

Further, according to a fourth aspect of the present invention, when a pump switching command is given, the flow rate of another water supply pump to which a flow rate request signal from the water level controller is input gradually increases, and one water supply pump switched simultaneously. And a flow distribution controller for changing the distribution ratio so as to gradually reduce the flow rate and outputting the result to another feed water pump controller and one feed water pump controller.

In the apparatus having the above configuration, when the pump is switched, the flow rate distribution controller distributes the flow rate request signal so that the flow rate of the supplied water pump increases, while the flow rate of the switched water pump decreases accordingly. Distribute as follows. Allocation is performed so as to simultaneously increase the flow rate of the subsequently supplied water supply pump and decrease the flow rate of the switched water supply pump, and finally allocates 100% of the flow rate request signal to the supplied water supply pump. The pump switching can be completed without the manual setting operation by the pump switching by the automatic control that determines the distribution based only on the flow rate request signal.

According to a fifth aspect of the present invention, when a failure signal indicating an abnormality of another water supply pump, one water supply pump, and a water supply control valve is detected, a pump switching command of the nuclear reactor water supply control device is issued. A pump failure monitoring unit that outputs a stop signal for stopping pump switching to the pump switching general control unit.

In the apparatus having the above configuration, when a failure signal is detected in the feed water pump and the feed water control valve which are turned on or switched during the pump switching, the pump failure monitoring section switches the pump of the reactor feed water control device. A stop signal is output to the pump switching general control unit issuing the command, and the pump switching is stopped. With this control method, pump switching can be stopped only when an abnormality occurs in the equipment directly related to the water supply system itself. Can be prevented.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the manual control system includes a pump switching general control unit 1, a correction signal generation unit 2, a manual setting signal generation unit 3, a T / DRFP-B setting unit 4, and a set value monitoring unit 5. The pump switching general control section 1 outputs a start signal to the correction signal generation section 2 and the manual setting signal generation section 3. When the start signal is input, the manual setting signal generator 3 inputs the manual setting signal to the T / DRFP-B setting device 4, and the T / DRFP-B setting device 4 generates a setting value signal according to the manual setting signal. Output. The set value monitoring unit 5 includes a T / DRF
When the set value signal of the P-B setting device 4 is a predetermined value (T / D
When the discharge flow rate of the RFP-B reaches a value at which the discharge flow starts to flow, a correction permission signal is output to the correction signal generation unit 2.

On the other hand, the automatic control system includes a deviation calculator 6, adders 7, 9, an integral controller 9, and a proportional controller 10. The deviation calculator 6 calculates a deviation between a water level set value and a water level signal from a water level detector (not shown) detecting the reactor water level, and outputs a deviation signal to the adder 7. The adder 7 adds the input deviation signal and the correction value signal from the correction signal generator 2 and outputs the result to the integration controller 8. Adder 9
Adds the signal from the proportional controller 10 and the signal from the integral controller 8 to output a flow rate request signal. T / DRFP
-A controller 11 performs T / DRFP-A according to the flow rate request signal.
12 to output a rotation speed command signal for changing the rotation speed.

Here, when the start signal is input, the manual setting signal generating section 3 converts the manual setting signal to T / DRFP-B.
It outputs to the setting device 4 and changes the set value signal of the T / DRFP-B setting device 4 according to the manual setting signal. T / DRFP-
The B controller 14 outputs a rotation speed command signal of the T / DRFP-B 15 according to the set value signal that changes by the manual operation.

Next, the operation of the above configuration will be described with reference to FIG. The pump switching operation in FIG. 2 is T / DRFP-A
Reference numeral 14 denotes a case where the T / DRFP-B 15 is turned on by manual setting during operation under automatic control. T / D
At the start of pump switching, a start signal is supplied from the pump switching general control unit 1 to the correction signal generating unit 2, but the correction permission signal is not input from the set value monitoring unit 5 and the flow rate m of the RFP-A12 is changed. Maintains the same flow rate. At this time, the output (setting value S) of the T / DRFP-B setting device 4 is increasing, but the discharge flow rate of the T / DRFP-B15 is zero.

When the set value signal of the T / DRFP-B setting device 4 further increases (point p), the water supply starts to be discharged at the T / DRFP-B15, and the flow rate n of the T / DRFP-B15 gradually increases. Thus, the flow signal from the flow detector 13 exceeds the threshold. At this time, a correction permission signal is output from the set value monitor 5 to the correction signal generator 2.

That is, the characteristics of the feedwater pump include a non-linear part in the relationship between the flow rate setting and the actual flow rate, where the actual flow rate does not increase in proportion to the increase in the flow rate request signal even if the flow rate request signal increases. No correction signal is given to the automatic control system for the non-linear part, but T
/ DRFP-B setting device 4 is set to a predetermined value (T
/ DRFP-B reaches a value at which the discharge flow rate starts to be output (point p), a correction permission signal is output, and thereafter, a correction signal from the correction signal generator 2 is taken into control (correction start point p). ). As described above, at the time of starting the pump switching, the control for reducing the flow rate by the correction signal is not immediately performed, and the input T /
Control is performed so that the flow rate of the T / DRFP-A12, which is switched when the predetermined discharge flow rate is secured by the DRFP-B15, is decreased according to the correction signal.

In this way, it is possible to reliably prevent the reactor water level from temporarily dropping into an unstable state.
It is possible to keep the stable reactor water level 1 as shown in FIG.

In this embodiment, the input T / DR
The method of outputting a correction signal when the actual discharge flow rate is secured by the FP-B15 is to keep the reactor water level stable. However, when the discharge flow rate is reduced by switching the pump, the discharge flow rate becomes the predetermined flow rate. When it decreases, the correction signal needs to be stopped.

Similarly, in the case of the M / DRFP, a set value at which the discharge flow rate starts to be obtained is obtained in advance from the characteristics of the water supply control valve, and a correction permission signal is output when the set value reaches that value.

As described above, in the present embodiment, the reactor water level can be prevented from falling into an unstable state due to the switching of the pump, and a more stable water level can be maintained.

Further, a preferred embodiment will be described.
In FIG. 3, a pump switching general control unit 1, a manual setting signal generating unit 3, a T / DRFP-B setting unit 4, and a T / DRF
The P-B controller 14 comprises the same means as in the above embodiment. In the present embodiment, when the required minimum set value can be secured by the manual setting operation, the limiter 1 that defines the upper limit of the manually set signal during program control.
6 are provided. The limiter 16 outputs a manual setting signal to the T / DRFP-B setting device 4 by a method described later. The limiter 16 is provided with an initial state storage unit 17 for storing the state at the time of starting the water supply pump switching and an allowable flow rate calculating unit 18 for calculating the allowable flow rate at the time of switching. And the minimum flow rate necessary for the manual control side is defined as the upper limit of the manual setting signal.

Next, the operation of the above configuration will be described. In the operation by the manual setting, the water supply which is not originally subject to the automatic control increases, which is an obstacle to keeping the reactor water level stable.
In the present embodiment, the water supply, which is not subject to the automatic control during the program control, is limited so as not to exceed a certain flow rate. When the water supply pump is switched, for example, two T
The minimum flow rate required for one of the / DRFP units on the manual control side is calculated and determined by the allowable flow rate calculation unit 18 based on the flow rate at the time of switching stored in the initial state storage unit 17. According to the obtained flow rate, the manually set signal is limited so that the limiter 16 does not exceed this.

Thus, when the pump is switched, even if the manual setting signal given by the operator becomes large, the water supply does not increase so as to exceed the allowable upper limit, and the ratio of the water supply not subject to the automatic control becomes large. And it is possible to remove factors that hinder stable control of the reactor water level. This method of restricting the flow rate of T / DRFP on the manual control side is most effective in program control, but may be used in combination with the other embodiments.

The present embodiment is an example in which the present invention is applied to the input of T / DRFP.
Alternatively, the present invention can be applied when switching from M / DRFP to T / DRFP.

As described above, in this embodiment, it is possible to reliably control an increase in the ratio of water supply that is not subject to automatic control, and it is possible to further improve controllability in reactor water supply control. is there.

Further, a preferred embodiment of the present invention will be described. In FIG. 4, the water supply control unit 19 of the process computer A outputs a water supply control device input signal to the pump switching general control unit 20 of the water supply control device B. Based on the flow rate request signal given from the main water level controller 21, the pump switching general control unit 20 controls the two M / DRFPs, T /
A start signal is output to the flow distribution controller 22 that changes the ratio of the flow distribution to DRFP. The flow distribution controller 22 converts the flow demand signal to an M / DRF according to the programmed ratio.
Output to the P controller 23 and the T / DRFP controller 24. The M / DRFP controller 23 and the T / DRFP controller 24 perform M / DRFP control based on the supplied flow rate request signal.
And the flow rate of T / DRFP. Further, the plant monitoring unit 28 similarly outputs a stop signal to the water supply control unit 19 when receiving a failure signal from the water supply pump abnormality detector and the water supply control valve abnormality detector.

Next, the operation of the above configuration will be described. M
Water supply control unit 1 when switching from / DRFP to T / DRFP
When an input signal is output from 9 to the overall pump control unit 20, a start signal is output from the overall pump control unit 20 to the flow distribution controller 22. At the initial stage of pump switching, the flow distribution controller 22 controls the flow request signal to 100%
Is distributed to the M / DRFP operated by the automatic control. T /
After the normal startup of the DRFP is confirmed, the flow rate request signal is distributed according to the program so that the flow rate of the input T / DRFP increases.

At this time, the flow rate of the M / DRFP switched by the decrease in the distribution decreases. Continue T / DRFP
Is increased while the flow rate of the M / DRFP is decreased, and 100% of the flow rate request signal is finally allocated to the T / DRFP. At this time, the distribution ratio to M / DRFP becomes zero. Thus, the switching from M / DRFP to T / DRFP can be completed while the M / DRFP controller 23 and the T / DRFP controller 24 are operated under automatic control.

Here, assuming that the input T / DRFP does not increase the rotation speed for some reason, T / DRF
A failure signal from the feedwater pump abnormality detector provided for P is input to the plant monitoring unit 28. When the failure signal is input, a stop signal is output from the plant monitoring unit 28 to the water supply control unit 19, and the pump switching is stopped.

It is difficult to secure a predetermined discharge amount while the increase in the number of revolutions of the T / DRFP is suppressed. Therefore, the pump switching is stopped and the supply of the water supply by the M / DRFP is continued.
In addition to this, the T / DRFP
There is abnormal operation due to malfunction of rotation speed increase of M / DRFP when switching from M / DRFP to M / DRFP, trip of M / DRFP and T / DRFP, stick of water supply control valve, etc.
When an abnormality is detected by each detector, a stop signal is output from the plant monitoring unit 28, and the pump switching is stopped.

Thus, in the present embodiment, when the pump is switched, the pump can be switched by automatic control that determines the distribution based only on the flow rate request signal.
The pump switching can be completed without any manual setting operation to maintain the reactor water level, and controllability can be further improved.

In this embodiment, switching from one T / DRFP to two T / DRFPs and switching from two T / DRFPs to
/ DRFP 1 unit, T / DRFP to M / DRF
It can also be applied to switching to P. Also, M
The present invention can be applied to a water supply system including three / DRFPs.

Further, a preferred embodiment of the present invention will be described. In FIG. 5, the pump switching general control unit 20 of the water supply control device B includes a correction signal generator 25 and a manual setting device 2.
Then, a start signal is output to the control unit 6. The correction signal generator 25 outputs to the M / DRFP controller 23 a correction signal for limiting the flow rate request signal of the main water level controller 21 and reducing the flow rate. The manual setting device 26 outputs a manual setting signal to the T / DRFP controller 24 when the start signal is input. The M / DRFP controller 23 and the T / DRFP controller 24 control the flow rates of the M / DRFP and the T / DRFP based on the supplied flow request signal and the set value signal.

The pump failure monitoring unit 27 outputs a stop signal to the pump switching general control unit 20 when receiving a failure signal from a water supply pump abnormality detector and a water supply control valve abnormality detector (not shown). In the drawings, reference numerals 29 and 30 denote pump monitoring units, which are provided to stop the operations of the M / DRFP controller 23 and the T / DRFP controller 24 when receiving a failure signal from each of the above detectors. Can be

Next, the operation of the above configuration will be described. M
At the time of switching from / DRFP to T / DRFP, the water supply amount corresponding to the water supply flow rate request signal from the main water level controller 21 is M / D.
Sent by RFP. For example, T /
Assuming that the rotational speed of the DRFP does not increase for some reason, a failure signal from the feedwater pump abnormality detector provided in the T / DRFP is input to the pump failure monitoring unit 27 and the pump monitoring unit 29, respectively. When the failure signal is input, the pump failure monitoring unit 27 sends the pump switching general control unit 2
A stop signal is output to 0, and pump switching is stopped.

It is difficult to secure a predetermined discharge amount while the increase in the number of revolutions of the T / DRFP is suppressed, so that the pump switching is stopped and the supply of the water supply by the M / DRFP is continued.
In addition to this, the T / DRFP
There is abnormal operation due to malfunction of rotation speed increase of M / DRFP when switching from M / DRFP to M / DRFP, trip of M / DRFP and T / DRFP, stick of water supply control valve, etc.
When an abnormality is detected by each of the detectors, a stop signal is output from the pump failure monitoring unit 29, and the pump switching is stopped.

By such a method that the pump switching is stopped only when an abnormality occurs in the equipment directly related to the water supply system, for example, the pump switching is stopped in order to coincide with the trouble on the monitoring item due to the automation of the process computer. It is possible to reliably prevent a forced switchover from being interrupted due to an abnormality in other equipment of the nuclear power plant that does not originally require the pump switchover. In addition, it is possible to avoid inconveniences such as forcing pump switching to be stopped while the feedwater pump operated by manual setting remains, and to remove a factor that hinders stable control of the reactor water level. It is possible.

The present embodiment can be applied to any of a water pump driven by an electric motor and a turbine. Further, the present invention can be applied to a water supply system including three M / DRFPs.

[0051]

As described above, according to the first aspect of the present invention, the control start timing is adjusted when the pump is switched, so that the controllability in the water supply control can be improved, and the reactor water level can be more stably maintained. It is possible to hold.

Further, in the inventions according to claims 2 and 3, when the pump is switched, the upper limit of the manually set signal is specified while securing the necessary flow rate on the manual control side. Can be prevented from increasing the ratio of supplied water.

Further, in the invention according to the fourth aspect, when the pump is switched, the flow distribution is determined based only on the flow request signal, so that the pump switching can be completed without any manual setting operation.

In the invention according to claim 5, the pump switching can be stopped only when an abnormality occurs in the equipment itself directly related to the water supply system at the time of pump switching, and a nuclear power plant which does not need to stop switching is provided. It is possible to prevent switching stoppage due to another device abnormality from entering.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a reactor water supply control device according to the present invention.

FIG. 2 is a diagram showing changes in a feed water pump flow rate and a reactor water level when the pump is switched.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional reactor water supply control device.

FIG. 7 is a diagram showing changes in a feed water pump flow rate and a reactor water level when the pump is switched.

FIG. 8 is a block diagram showing a conventional reactor water supply control device.

FIG. 9 is a diagram showing changes in a feed water pump flow rate and a reactor water level when the pump is switched.

[Explanation of symbols]

 1, 20 Pump switching general control unit 2 Correction signal generation unit 3 Manual setting signal generation unit 5 Set value monitoring unit 11 T / DRFP-A controller 14 T / DRFP-B controller 16 Limiter 22 Flow rate distribution controller 23, 24 RFP controller 27 Pump failure monitor

Claims (5)

[Claims] A water level controller that outputs a flow rate request signal based on a deviation between a detected reactor water level signal and a set value;
One water supply pump controller that outputs a rotation speed command signal that changes the rotation speed of one water supply pump according to the flow rate request signal from the water level controller, and a manual setting signal when a pump switching command is given A manual setting signal generator that outputs
And another water supply pump controller that outputs a rotation speed command signal for changing the rotation speed of another water supply pump based on the manual setting signal from the manual setting signal generation unit. Controlling the other feedwater pump supplied by the controller and controlling the one feedwater pump switched by the flow rate request signal, the flow rate request in accordance with an increase in the manually set signal. A correction signal generator for outputting a correction signal so that the signal becomes smaller by the increment; and when the actual discharge amount of the other supplied water pump reaches a predetermined value, the correction signal generator corrects the signal. A reactor water supply control device, comprising: a set value monitoring unit that outputs a permission signal. 2. A water level controller that outputs a flow rate request signal based on a deviation between a detected reactor water level signal and a set value,
One water supply pump controller that outputs a rotation speed command signal that changes the rotation speed of one water supply pump according to the flow rate request signal from the water level controller, and a manual setting signal when a pump switching command is given A manual setting signal generator that outputs
And another water supply pump controller that outputs a rotation speed command signal for changing the rotation speed of another water supply pump based on the manual setting signal from the manual setting signal generation unit. In the reactor water supply control device, which controls the other water supply pump to be supplied by the above and controls the one water supply pump switched by the flow rate request signal, the manual setting signal from the manual setting signal generating unit A reactor water supply control device comprising a controller for defining an upper limit. 3. The reactor water supply control device according to claim 2, further comprising a switching allowable flow rate calculation unit that calculates an allowable flow rate of the pump switching based on the flow rate at the time of starting the pump switching. 4. A water level controller that outputs a flow rate request signal based on a deviation between the detected reactor water level signal and a set value,
A rotation speed command signal that changes the rotation speed of one water supply pump controller and another water supply pump that outputs a rotation speed command signal that changes the rotation speed of one water supply pump in response to the flow rate request signal from the water level controller In the reactor water supply control device, comprising: a water supply pump controller that outputs the other water supply pump that is supplied by a flow rate request signal and the one water supply pump that is switched when the pump is switched. When a pump switching command is given, the flow rate of the other water supply pump to which the flow rate request signal from the water level controller is supplied gradually increases, and the flow rate of the one water supply pump switched simultaneously is gradually reduced. A reactor water supply control device, comprising: a flow distribution controller that outputs a ratio to the other water supply pump controller and the one water supply pump controller. 5. A water level controller for outputting a flow rate request signal based on a deviation between a detected reactor water level signal and a set value,
One water supply pump controller that outputs a rotation speed command signal that changes the rotation speed of one water supply pump according to the flow rate request signal from the water level controller, and a manual setting signal when a pump switching command is given A manual setting signal generator that outputs
And another water supply pump controller that outputs a rotation speed command signal for changing the rotation speed of another water supply pump based on the manual setting signal from the manual setting signal generation unit. A reactor water supply control device that controls the other water supply pump to be supplied by the control unit and controls the one water supply pump switched by the flow rate request signal, wherein the other water supply pump, the one water supply pump, and the water supply A pump failure monitoring unit that outputs a stop signal for stopping pump switching to a pump switching general control unit that issues a pump switching command of the reactor water supply control device when a failure signal indicating an abnormality of the control valve is detected. A reactor water supply control device, characterized in that: