JPH11271491A - Reactor feed water controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor feed water controller continuously executing reactor water level control by a reactor auxiliary feed water pump, by making a selection switch in the control system for the auxiliary feed water pump control valve override and be an automatic control position, when the reactor auxiliary feed water pump is automatically activated in anomaly of the reactor main feed water pump. SOLUTION: A reactor feed water controller 27 places a judgment means 31 for monitoring the control position in a selection switch 30 selecting automatic control and manual control of a control valve 7 controlling the flow of the reactor auxiliary feed water pump 4, when the reactor auxiliary feed water pump 4 is activated upon receiving an external signal 36, and always for selecting and maintaining the automatic control position of the selection switch 30; and a switching command means 32 for outputting a switch signal 35 to automatic control to the selection switch 30 by the command from the judgment means 31.

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 system for adjusting a reactor water level, which achieves a water supply function in a reactor auxiliary water supply pump that performs a post-operation of a reactor main water supply pump that is normally operating. The present invention relates to a reactor water supply control device for smooth execution.

[0002]

2. Description of the Related Art For example, in a feedwater control system in a boiling water reactor, as shown in a schematic configuration diagram of FIG. 5B, a reactor water 2 in a normal reactor 1 is supplied by a reactor main feedwater pump 3. However, when an abnormality occurs in the reactor main water supply pump 3 during the operation of the reactor 1, the reactor auxiliary water supply pump 4 for back-up is automatically started, and the reactor main water supply pump 3 is operated. It tries to make up for the shortage of water supply due to the abnormality of 3.

At this time, regarding the operation of the auxiliary water supply pump 4, the auxiliary water supply pump operation switch 5 shown in the front view of FIG. 6 is always in the "automatic" position due to spring force or the like.
The reactor auxiliary water pump 4 is in a standby state. Therefore, the reactor auxiliary water supply pump 4 is automatically started by input of an automatic start signal (not shown). Further, the power is supplied to the drive motor 6 for driving the reactor auxiliary water supply pump 4 by the “start” operation of the handle 5a by the operator, whereby the reactor auxiliary water supply pump 4 is arbitrarily started. Can be.

Further, at the "stop" position of the handle 5a operated by the operator, the power supply to the drive motor 6 is cut off, and the reactor auxiliary water supply pump 4 is thereby stopped.
When the operator releases the handle 5a, the auxiliary water pump operation switch 5 returns to the "automatic" position. In addition,
By controlling the opening degree of the auxiliary water supply pump adjusting valve 7 installed on the outlet side of the auxiliary water supply pump 4 for the auxiliary water supply pump, the flow rate of the water supply to the nuclear reactor 1 is adjusted to reduce the water supply shortage in the nuclear reactor 1 which is the original purpose. Supplementation is achieved.

[0005] Regarding the reactor water supply control relating to the opening control of the adjusting valve 7 for the auxiliary water supply pump, as shown in the block diagram of FIG. It is composed of a switching unit 10 and a manual setting unit 11, and is performed by this control system. The control means 9 includes a regulator 14 to which the reactor water level set value 12 and the measured reactor water level 13 are inputted,
And an arithmetic unit 16 for inputting the output of the above and outputting the automatic control signal 15 of the regulating valve.

The selector switch 10 inputs the control valve automatic control signal 15 and the control valve manual control signal 17 which can be arbitrarily set by the operator from the manual setting device 11, and performs "automatic control" by the operator. Alternatively, either the control valve automatic control signal 15 or the control valve manual control signal 17 is output by selecting the control position of “manual control”.

When the control position of "automatic control" is selected by the selection switch 10, and if an abnormality occurs in the reactor main water supply pump 3 during the normal operation of the reactor 1, the auxiliary water supply pump operation switch 5 is set to "automatic", so that the auxiliary water supply pump 4 for the back-up is automatically activated.

At this time, the control means 9 calculates the difference between the furnace water level set value 12 and the measured furnace water level 13 calculated by the adder 14 in the adjuster 14, and calculates the adjustment valve automatic control signal 15 by the calculator 16. It is transmitted to the adjustment valve 7 for the auxiliary water supply pump via the switch 10 and the flow rate 18 of water supply to the reactor 1 is adjusted. As a result, control is performed so that the reactor water level set value 12 and the measured reactor water level 13 match, and the water supply that is insufficient due to the abnormality of the reactor main water supply pump 3 by the reactor auxiliary water supply pump 4. To supplement.

Therefore, the auxiliary water supply pump 4 for the rear reactor is provided.
To automatically start and automatically control the furnace water level 13
It is necessary that the selection switch 10 has selected the control position of “automatic control”. On the other hand, the selection switch 10 is set to "manual control".
When the control position is selected, the operator adjusts the manual setting device 11 to increase or decrease the opening of the adjustment valve 7 for the auxiliary feed pump.

[0010]

The selection switching device 10
When the control position of “manual control” is selected, even if the reactor auxiliary water supply pump 4 is automatically started,
The control valve automatic control signal 15 from the control means 9 is not transmitted to the control valve 7 for the auxiliary feed water pump. Accordingly, since the opening of the adjusting valve 7 for the auxiliary water supply pump is set by the manual control signal 17 of the manual setting device 11, if the manual control signal 17 of the adjusting valve is zero, the auxiliary water supply The opening of the pump adjusting valve 7 is fully closed, and the water supply from the auxiliary water supply pump 4 is not performed.

In the control position of "manual control", the adjustment of the manual setting device 11 causes the adjustment valve 7 for the auxiliary water supply pump to operate.
The appropriate operation of quickly adjusting the furnace water level 13 by controlling the opening degree of the furnace to compensate for the insufficient water supply places a heavy burden on the operator. From this, the reactor 1 to be controlled is
There is a problem that the original purpose of operating the reactor auxiliary water supply pump 4 as a back-up for quickly compensating for the shortage of water supply to the reactor and maintaining the reactor water level 13 at the reactor water level set value 12 is not sufficiently achieved.

Further, even when "automatic control" is selected in the selection switching unit 10 and the water supply operation by the reactor auxiliary water supply pump 4 is being performed smoothly, the selection switching unit 10 may be erroneously operated due to human error. When the "automatic control" is changed to the "manual control" in the above, there occurs a problem that the control for maintaining the furnace water level set value 12 of the furnace water level 13 by the regulating valve automatic control signal 15 is not performed as described above. .

[0013] It is an object of the present invention to provide a control system for the auxiliary water supply pump adjusting valve, which automatically switches the auxiliary water supply pump, when the reactor main water supply pump is abnormally operated, so that the selection switcher is operated at the manual control position. The present invention is to provide a reactor water supply control device that continuously executes reactor water level control by a reactor auxiliary water supply pump by overriding the automatic water supply position even if it is selected.

[0014]

According to a first aspect of the present invention, there is provided a reactor water supply control device for adjusting a reactor water level in a reactor, which receives an external signal. When automatically starting the reactor auxiliary water supply pump, monitoring the control position in the selection switch for selecting between automatic control and manual control of the regulating valve for adjusting the flow rate of the reactor auxiliary water pump, And a switching command unit for outputting a switching command to the automatic control to the selection switch in accordance with a command from the determining unit.

When the main water supply pump of the reactor is stopped due to an abnormality, the amount of water supply is reduced. The reduced water supply is compensated for by automatically starting the auxiliary water supply pump for the reactor, but the amount of water supplied by the auxiliary water supply pump at this time is adjusted. There is a selection switch in the control system of the auxiliary water supply pump adjustment valve for performing the operation.

When the control position of the manual control is selected by the selection switch, the amount of water supplied to the reactor auxiliary water pump by the auxiliary water pump adjustment valve cannot be automatically controlled. However, when the determination means determines that the control position in the selection switch is manual control, it switches to the control position of automatic control via the switching instruction means and performs automatic control of the water supply amount.

According to a second aspect of the present invention, in the reactor water supply control apparatus according to the first aspect, the judging means is configured to automatically start a reactor auxiliary water supply pump based on an external signal at that time in the selection switch. And when the control position at this time is manual control, a switching command for changing the control position of the selection switch to automatic control is given to the switching command means, and the automatic control is performed by the selection switch. When the change to is not completed, the switching position is repeatedly output to change the control position of the selection switch to the automatic control.

The judgment means receiving the external signal monitors the control position of the selection switch at that time, and outputs a switching command to the switching command means for automatic control to the switching command means in the case of manual control. Further, when the switching instruction means is monitored and the change to the automatic control is not completed, the switching instruction is repeatedly output to the switching instruction means to change the control position in the selection switch to the automatic control.

According to a third aspect of the present invention, in the reactor water supply control apparatus according to the second aspect, the judging means determines a selected position of the selection switch from an external signal for automatically starting the reactor auxiliary water supply pump. Output a message notifying that the change to the automatic control is completed.
When the control position is changed to the automatic control in the selection switch, the determining means outputs a message indicating the completion of the change and notifies the operator of the fact.

According to a fourth aspect of the present invention, in the reactor water supply control apparatus according to the second aspect, the judging means selects the selection during the start-up operation of the auxiliary reactor water supply pump in which the selection switch is automatically controlled by an external signal. When the switch is manually selected for manual control, a message notifying that the selected position of the selection switch has been excluded from the automatic control is output.

When the control position of the automatic control in the selection switch is manually selected for manual control, the determination means outputs a message notifying that the selected position is excluded from the automatic control, and outputs the message. A warning is given to the operator.

According to a fifth aspect of the present invention, there is provided the reactor water supply control apparatus according to the first aspect, wherein the external signal is for automatically starting the reactor auxiliary water supply pump, and stopping the reactor main water supply pump. And a signal for automatically starting the system in an operation switch by manual operation of the reactor auxiliary water supply pump. The reactor auxiliary water supply pump is automatically activated by an external signal based on a stop signal of the reactor main water supply pump and a signal for automatically starting the system in the operation switch of the reactor auxiliary water supply pump, thereby automatically controlling water supply.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and detailed description thereof will be omitted. The high-temperature and high-pressure steam generated in the reactor 1 as shown in the configuration diagram of FIG.
Through 20, sent to the steam turbine 21, the turbine generator
Drive 22 to generate electricity.

The steam exiting the steam turbine 21 is condensed in a condenser 23, is pumped through a condensing pipe 24 by the main water supply pumps 3 a and 3 b, and is supplied as water as indicated by a solid line arrow 25. The gas is supplied from the pipe 26 into the reactor 1.
Therefore, the water supply system for the nuclear reactor 1 is composed of two reactor main water supply pumps 3a and 3b, a rear auxiliary water supply pump 4 and an auxiliary water supply pump regulating valve 7, and the water supply control thereof. The system has a configuration in which the reactor water supply control device 27 shown in the block diagram of FIG. 2 is provided.

The reactor main water supply pumps 3a and 3b are turbine driven pumps driven by driving turbines 28a and 28b using steam as a driving source. % Of the reactor main feed water pumps 3a and 3b are operated to supply water to the reactor 1.

The reactor main feed water pumps 3a, 3b
For the back-up, a reactor auxiliary water supply pump 4 driven by a drive motor 6 is provided. The reactor auxiliary water supply pump 4 generally includes two 25% capacity water supply pumps. However, here, for the sake of simplicity together with the explanation, it is simplified and shown as one reactor auxiliary water supply pump 4 having a capacity of 50%.

At the outlet side of the auxiliary water supply pump 4 having a capacity of 50% by the two units, an adjustment valve 7 for the auxiliary water supply pump is provided, respectively. The flow rate of the auxiliary water pump 4 is adjusted.

An auxiliary water supply pump operation switch 29 shown in the front view of FIG. 3A is connected to the drive motor 6 of the reactor auxiliary water supply pump 4. Numeral 29a is always in the "automatic" position, and automatically activates the reactor auxiliary water supply pump 4 when conditions for automatic operation by an external signal (not shown) are satisfied.

Further, the power supply to the drive motor 6 for driving the reactor auxiliary water supply pump 4 is controlled by the operator to operate the "off" or "start" and the "system automatic start" shown in FIG. The operation is stopped and started by turning off and on, and the operator returns to the "automatic" position when the operator releases his / her handle from the handle 29a.

As shown in FIG. 2, the reactor water supply control device 27
Comprises a control means 9, a selection switch 30 and a manual setting device 11, a judgment means 31, a switching command means 32 and a notification means 33 (claim 1). The control means 9 includes a regulator 14 to which the reactor water level set value 12 and the measured reactor water level 13 are input,
An arithmetic unit 16 receives the output of the adder / subtractor 14 and outputs an adjustment valve automatic control signal 15.

The selector switch 30 receives the control valve automatic control signal 15 and the control valve manual control signal 17 from the manual setting device 11, and selects "automatic control" or "manual control" by the operation of the operator. The control position is selected, and either the regulating valve automatic control signal 15 or the regulating valve manual control signal 17 is output. At this time, the selection switch 30 outputs the control position signal 34 of the selected “automatic control” or “manual control” to the judging means 31 and forcibly outputs the control signal 35 from the switching command means 32. The control position of "automatic control" is selected (claim 2).

The judgment means 31 inputs a system automatic start signal 37 from the auxiliary water supply pump operation switch 29 and a main water supply pump stop signal 38 as external signals 36,
The control position in the selection switch 30 is monitored by the control position signal 34 input from the selection switch 30.

From this monitoring result, when the control position of "manual control" is selected by the selection switch 30 from the control position signal 34 and the external signal 36 is inputted, the selection is made to the switching command means 32. A switch command signal 39 is issued so as to output a switch signal 35 for selecting a control position of “automatic control” to the switch 30. The switching command signal 39 is repeatedly output until the control position of "automatic control" is selected by the selection switch 30 (claim 4).

Further, in the judging means 31, when the control position has been switched from "manual control" to "automatic control" in the selection switcher 30 by the switching command means 32, and when the operation at the "automatic control" control position is completed, If any of the control positions is artificially excluded from the "automatic control" control position, a message to that effect is displayed on the notification means 33 (claims 3 and 5).

Next, the operation of the above configuration will be described. Reactor water 2 in the reactor 1 during normal operation is supplied to the reactor main feed pump 3 driven by the drive turbines 28a and 28b.
Although water is supplied by a and 3b, if the reactor main water supply pump 3a or the reactor main water supply pump 3b is stopped due to an abnormality, the water supply shortage due to the stoppage occurs. In response to this shortage of water supply, the auxiliary reactor water supply pump 4 is automatically activated to make up for the shortage.

At this time, the operation of the auxiliary water supply pump 4 for the reactor is set to the standby position because the auxiliary water supply pump operation switch 29 is always in the "automatic" position due to spring force or the like. It is in a state. Accordingly, when the auxiliary water supply pump operation switch 29 is in the "automatic" position, the power is supplied to the drive motor 6 by an automatic start signal such as a main water supply pump stop signal, and the reactor auxiliary water supply pump 4 is automatically turned on. Will be started.

The auxiliary reactor water supply pump 4 can also be started arbitrarily by the operator operating the handle 29a of the auxiliary water pump operation switch 29 to "start". When the operator operates the handle 29a at the "stop" position, the power supply to the drive motor 6 is cut off, so that the reactor auxiliary water supply pump 4 is stopped. However, when the operator releases his / her hand from the handle 29a, Then, the auxiliary water supply pump operation switch 29 returns to the "automatic" position.

The amount of water supplied to the reactor 1 to be controlled by the auxiliary water supply pump 4 is controlled by controlling the opening degree of the auxiliary water supply pump adjusting valve 7 installed on the outlet side of the auxiliary water supply pump 4. To compensate for the shortage caused by the abnormality of the reactor main feed pumps 3a and 3b,
Is maintained at the furnace water level set value 12.

In the reactor water supply control device 27, the control position of the "automatic control" or "manual control" of the selection switch 10 is selected by an operator, but when the "automatic control" is selected. When the reactor main feedwater pump 3a or the reactor main feedwater pump 3b is stopped due to an abnormality during the normal operation of the reactor 1, an automatic start signal such as the main feedwater pump stop signal 38 is issued. At this time, the auxiliary water supply pump operation switch 29 is set to "automatic" as shown in FIG. 3A, so that the reactor auxiliary water supply pump 4 for back-up is automatically activated.

In this way, in the control means 9, the difference between the furnace water level set value 12 and the measured furnace water level 13 calculated by the adder 14 in the adjuster 14 is calculated by the calculator 16, and the adjustment valve automatic control signal 15 is selected. It is transmitted to the auxiliary water supply pump regulating valve 7 via the switch 30 and the water supply flow rate 18 to the reactor 1 to be controlled is controlled.
Is adjusted.

As a result, the control is performed so that the reactor water level set value 12 and the measured reactor water level 13 coincide with each other, and the reactor auxiliary water supply pump 4 controls the reactor main water supply pump 3a or the reactor water supply pump 3a. Insufficient water supply due to an abnormality in the main water supply pump 3b can be appropriately compensated.

Accordingly, the auxiliary water supply pump 4 for the rear reactor is provided.
Automatically starts, and in order to automatically control the reactor water level 13 in the nuclear reactor 1, the selection switch 30 needs to be set to the control position of "automatic control". However, when the selection switch 30 is in the "manual control" control position, the control valve automatic control signal 15 is not transmitted to the auxiliary water supply pump control valve 7, so that the furnace water level 13 is automatically controlled. Can not.

At this time, the operator operates the manual setting device 11 to arbitrarily adjust the control valve manual control signal 17 to increase or decrease the opening of the control valve 7 for the auxiliary feed pump. The feedwater flow 18 to 1 can be adjusted. Here, if the operator sets the auxiliary water supply pump operation switch 29 to “system automatic start”, the judgment means 31 outputs a system automatic start signal from the auxiliary water supply pump operation switch 29.
37 and an external signal 36 by the main feed pump stop signal 38
Is entered.

The external signal 36 is a signal generated outside the judging means 31 for automatically activating the reactor auxiliary water supply pump 4 for the purpose of supplying water to the reactor 1. A main water supply pump stop signal 38 indicating stoppage of the pumps 3a and 3b, and the auxiliary water supply pump operation switch for activating the nuclear reactor auxiliary water supply pump 4 based on an operator's judgment.
This is a system automatic start signal 37 generated when 29 is set to the “system automatic start” position.

The main feed water pump stop signal 38 indicating the stop of the reactor main feed water pumps 3a and 3b is output when one of the two reactor main feed water pumps 3a and 3b is provided.
Of the three reactor main feed pumps 3a and 3b
It is a signal that indicates a stop when the vehicle itself stops to prevent damage to itself.

The judging means 31 receives a control position signal 34 indicating "automatic control" or "manual control" from the selection switch 30, and if the control position signal 34 is "manual control", The switch command signal is sent to the switch command means 32 by judging this state.
Outputs 39. As a result, the switch command means 32 causes the selection switch 32 to select a control position of “automatic control” in accordance with the switch command signal 35.

The judging function of the judging means 31 will be described with reference to a functional flowchart of FIG. When the reactor main feedwater pump 3a or the reactor main feedwater pump 3b is stopped due to an abnormality, a main feedwater pump stop signal 38 indicating this stop is issued. When the auxiliary water supply pump operation switch 29 for activating the nuclear reactor auxiliary water supply pump 4 is set to the “system automatic start” position in FIG. Output a system automatic start signal 37.

[0048] When the external signal 33 consisting of a main feedwater pump stop signal 38. and the system automatic start signal 37 is input to the determination unit 31, at Step 1 (hereinafter, abbreviated as S _1), <the external signal Is there 33? Confirm with>

Next, the control position signal 34 of the selection switch 30 in the S _2, or select switch 30 <"AutomaticControl" position? > And the confirmation, when was the control position of the "automatic control", to complete the determination action (S _3). At this time, if the selection switch 30 is not in the “automatic control” position in S ₂ , the determination means 31 sends the selection switch
At 30, a switching command (switching command signal 39) for selecting a control position of “automatic control” is output (S ₄ ).

The switching command means switching command signal 39 by S ₄
32 is switched (S ₅ ), and a switching signal 35 is output to the selection switch 30, so that the selection switch 30 is set to “manual control”.
From the control position of, selection sort of to control the position of the "automatic control" is performed (S _6). Further, the "automatic control" is selected in the selection switch 30, or <"autocontrol" position at S _7? > To determine (control position signal 34) of, if the "automatic control", to complete the determination action (S _3).

[0051] In the case where selection of the "automatic control" is not performed in the select switch 30 during this, which is returned to the S ₄ and the S ₇ determines, switching command means
32 repeatedly outputs a switching signal 35 for selecting “automatic control” to the selection switch 30 until the control position of “automatic control” is selected in the selection switch 30.

[0052] The determination act in S ₃ is completed, if the "automatic control" is selected in the selection switch 30 outputs a message to the effect that the position selection of "automatic control" is completed (S _8), to display in the notification unit 33 installed in the easy control chamber is transmitted, for example, in an operator (S _9).
In addition determining unit 31, even after the decision act in S ₃ is completed, or <"AutomaticControl" position in the selection switch 30 by S _10? > Monitors that "automatic control" is selected.

Therefore, once the reactor auxiliary water supply pump 4
Is activated, and in the state where the control position of “automatic control” is selected in the selection switch 30, the selection switch 30
The Selecting the "manual control" position, it is determined that the control position of the "automatic control" according to the selection switch 30 in the S ₁₀ is excluded. This control position of the "automatic control" is output as a message indicating that the excluded (S _11), the notification unit 33 installed in the easy control chamber is transmitted, for example, in operator
It is displayed as alert in (S _12).

As a result, when the auxiliary water supply pump 4 is automatically activated, the auxiliary water supply pump operation switch 29 is set to "system automatic activation", and the selection switch 30 is used to set the reactor water level 13 of the reactor 1 to the reactor water level set value 12. maintained at about the water supply control is erroneously if, "automatic control" in artificially the selection switch 30 when switched to control the position of the "manual control", informs a warning by display on the S ₁₂ Thus, erroneous operation can be prohibited.

[0055]

As described above, according to the present invention, when the reactor auxiliary water supply pump is automatically started when the reactor main water supply pump is stopped due to an abnormality, even if the reactor auxiliary water supply pump is automatically started. Even if the selection switch for controlling the regulating valve selects “manual control”, this is immediately changed to “automatic control”.

Thus, the water level of the reactor can be quickly and appropriately maintained by the water supply from the auxiliary water supply pump for the reactor, and the selector switch is left in the "manual control" state, so that the reactor for the rear-up is provided. Since the automatic control of the reactor water level by the reactor auxiliary water supply pump can be prevented from being hindered, the reliability is improved and the burden on the operator is reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water supply control system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a reactor water supply control device according to an embodiment of the present invention.

FIG. 3 is a front view of an auxiliary water supply pump operation switch according to an embodiment of the present invention, in which (a) is in an automatic position,
(B) shows a state where a system automatic start position is set.

FIG. 4 is a functional flowchart of a determination unit according to the embodiment of the present invention.

FIG. 5 is a block diagram of a conventional reactor water supply control device, and FIG.

FIG. 6 is a front view of a conventional auxiliary water supply pump operation switch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor, 2 ... Reactor water, 3, 3a, 3b ... Reactor main feed pump, 4 ... Reactor auxiliary feed pump, 5, 29 ... Auxiliary feed pump operation switch, 5a, 29a ... Handle, 6 ... Drive Motor, 7 ... adjustment valve for auxiliary water supply pump, 8,27 ... reactor water supply control device, 9 ... control means, 10,30 ... selection switch,
11… Manual setting device, 12… Water level setting value, 13… Reactor water level, 14… Regulator, 15… Adjustment valve automatic control signal, 16… Calculator, 17… Adjustment valve manual control signal, 18… Reactor water supply flow rate, 19: Steam (dotted arrow), 20: Main steam pipe, 21: Steam, 22: Turbine generator, 23: Condenser, 24: Condensate pipe, 25: Water supply (solid arrow), 26: Water supply pipe, 28a , 28b ... Drive turbine, 31
... Judging means, 32 ... Switching instruction means, 33 ... Notification means, 34 ... Control position signal, 35 ... Switching signal, 36 ... External signal, 37 ... System automatic start signal, 38 ... Main water pump stop signal, 39 ... Switching command Signals, S _{1 to} S ₁₂ ... Operation steps of the judgment function.

Claims (5)

[Claims] In a reactor water supply control device for adjusting a reactor water level of a nuclear reactor, an adjustment for adjusting a flow rate of the reactor auxiliary water supply pump when automatically starting a reactor auxiliary water supply pump in response to an external signal. Determining means for monitoring the control position of the selection switch for selecting between automatic control and manual control of the valve, and constantly selecting and maintaining the control position of the selection switch at the automatic control; and A reactor water supply control device, characterized in that a switch command means for outputting a switch command to automatic control is provided in the reactor. 2. The control device according to claim 1, wherein the determination unit monitors a control position at that time in the selection switch from an external signal for automatically starting the reactor auxiliary water supply pump, and determines that the control position at this time is manually controlled. In this case, the switching command means is given a switching command to change the control position of the selection switch to the automatic control, and when the change to the automatic control is not completed in the selection switch, the switching command is output repeatedly to switch the selection. 2. The reactor water supply control device according to claim 1, wherein the control position of the reactor is changed to automatic control. 3. The determination means sends a message notifying that the change of the selected position of the selection switch to the automatic control has been completed from an external signal for automatically activating the reactor auxiliary water supply pump. 3. The reactor water supply control device according to claim 2, wherein the output is outputted. 4. The selection switching device according to claim 1, wherein the selection switching device is manually switched to manual control during a start-up operation of the auxiliary water supply pump for the reactor, which is automatically controlled by an external signal. The reactor water supply control device according to claim 2, wherein a message is output to notify that the selected position of the reactor has been excluded from the automatic control. 5. The system according to claim 1, wherein the external signal is for automatically activating the auxiliary water supply pump of the reactor, and a stop signal of the main water supply pump of the reactor and an operation switch for manually operating the auxiliary water supply pump. 2. The reactor water supply control device according to claim 1, further comprising an automatic start signal.