JPH07225297A - Nuclear reactor feed water controller - Google Patents

Abstract

PURPOSE:To provide a nuclear reactor feed water controller which can simply confirm a responding speed and response of a feed water flow rate regulating valve by an operation of a central operation chamber without a temporary measuring facility irrespective of an operating state of a nuclear power plant. CONSTITUTION:A nuclear reactor feed water controller 21 controls a nuclear reactor water level constant, and comprises a test allowance deciding unit 25, a step signal generator 26 for outputting a step signal 29, a signal switching unit 24 for switching an opening command signal 16 and the signal 29 of a feed water flow rate regulating valve 17, and a transient phenomenon analyzer 27 for analyzing a responding speed and response of the valve 17 in a motor drive nuclear reactor feed water pump flow rate controller 22 for regulating the valve 17 for controlling a flow rate of a motor driven nuclear reactor feed water pump 5, wherein an analyzed result is displayed on a feed water controller operation panel 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the flow rate of a turbine-driven reactor feed water pump and an electric motor-driven reactor feed water pump in a reactor feed water control system of a nuclear power plant, and the reactor blowdown flow rate to control the inside of the reactor. Related to the reactor water supply control device that controls the water level of the reactor to a predetermined set water level, and in particular, the electric motor-driven reactor water supply pump flow controller that controls the flow rate of the electric motor-driven reactor water supply pump and the feed water flow rate adjustment valve that is its actuator. It relates to a reactor water supply control device capable of performing a surveillance test and maintenance.

[0002]

2. Description of the Related Art As shown in the block diagram of FIG. 3, a conventional reactor feed water control apparatus includes a reactor feed water control apparatus 1, a main controller 2 and a turbine driven reactor feed water pump 3 (hereinafter referred to as T-
A T-RFP flow rate controller 4 for controlling the flow rate of RFP and an electric motor driven reactor feedwater pump 5 (hereinafter referred to as MR).
An M-RFP flow rate controller 6 for controlling the flow rate of the FP) and a reactor blowdown flow rate adjustment valve controller 7 for controlling the reactor blowdown flow rate are provided.

The main controller 2 performs PI control by inputting the actual water level signal 8, and the T-RFP flow rate controller 4 and MR are controlled.
A pump flow rate request signal 9 is output to the FP flow rate controller 6 and the reactor blowdown flow rate adjustment valve controller 7. T-RF
The P flow rate controller 4 converts the input pump flow rate request signal 9 into a rotation speed signal 10 and supplies the rotation speed signal 10 to the water feed turbine 11, whereby the rotation speed of the water feed turbine 11 is controlled and T- The outlet flow rate of RFP3 is controlled.

The M-RFP flow rate controller 6 has a pump flow rate request signal 9 input from the main controller 2 and a flow rate signal 12 from the M-RFP 5 as shown in the block diagram of FIG. Is calculated by the addition calculator 13, the deviation signal 14 is calculated by the PI controller 15, and the feed water flow rate adjustment valve opening command signal is calculated.
16 is supplied to the feed water flow rate adjusting valve 17, whereby the opening of the feed water flow rate adjusting valve 17 is controlled to control the outlet flow rate of the M-RFP 5.

Further, the reactor blowdown flow rate adjustment valve controller 7 converts the pump flow rate request signal 9 input from the main controller 2 into a reactor blowdown flow rate adjustment valve opening command signal 18, which is converted into an atomic level. By giving it to the reactor blowdown flow rate adjusting valve 19, the opening degree of the reactor blowdown flow rate adjusting valve 19 is adjusted to control the reactor blowdown flow rate. In addition,
The operation of each of these controllers and the confirmation of parameters to be controlled are performed on the water supply control system operation panel 20 installed in the central operation room of the nuclear power plant.

Next, a conventional operation confirmation test of the feed water flow rate adjusting valve 17 in the M-RFP 5 will be described. Normally, the M-RFP5 operates at the time of starting the nuclear power plant, but the nuclear power plant has 100
Water supply control during constant operation with% output is T-RF
It is performed only in P3, and M-RFP5 is stopped and in a standby state.

However, as a soundness confirmation test for the stand-by equipment, a functional test of the feed water flow rate adjusting valve 17 is periodically performed by manual operation from the operation panel 20, where the opening and closing of the water feed flow rate adjusting valve 17 is preset. Confirm that the valve can be opened and closed at the specified speed, that there are no abnormal movements during opening and closing, and that the valve opening command value and the actual valve opening resulting therefrom match within the specified accuracy.

Further, at the time of periodic inspection of the nuclear power plant, in addition to the same test as the test when the nuclear power plant is constantly operated at 100% output, temporary measuring equipment (step signal generator , Transient phenomenon recording device, etc.)
The response speed and responsiveness of 17 are measured, because the responsiveness of the feed water flow rate adjusting valve 17 to the command signal has a great influence on the feed water pump flow rate control and the reactor water level control.

The characteristic diagram of FIG. 5 shows a case where the response of the feed water flow rate adjusting valve 17 is normal, and the opening of the feed water flow rate adjusting valve 17 and the feed water flow rate when the pump flow rate request signal 9 changes stepwise. In the trend of the adjustment valve opening command signal 16 and the M-RFP flow rate signal 12, the vertical axis shows the process amount of each parameter and the horizontal axis shows time. Here, when the pump flow rate request signal 9 changes stepwise, the feed water flow rate adjustment valve opening command signal 16 changes to PI.
Since it is the output of the controller 15, it becomes a signal multiplied by the control constant set in the PI controller 15.

Further, the feed water flow rate adjusting valve 17 follows the feed water flow rate adjusting valve opening command signal 16 and opens without any operation delay.
Further, the M-RFP flow rate signal 12 is opened when the feed water flow rate adjusting valve 17 is opened, so that the flow rate of the M-RFP 5 is gradually increased to the flow rate requested by the pump flow rate request signal 9, and the feed water flow rate adjusting valve is opened. Degree command signal 16 becomes constant, and the opening degree of the feedwater flow rate adjusting valve 17 is also settled constant.

The characteristic diagram of FIG. 6 shows the case where the response of the feed water flow rate adjusting valve 17 is slow. As in the case of FIG. 5, the feed water flow rate adjusting valve when the pump flow rate request signal 9 changes stepwise.
17 opening, feed water flow rate adjusting valve opening command signal 16 and MR
The trend of the FP flow rate signal 12 is shown, the vertical axis shows the process amount of each parameter, and the horizontal axis shows time.

When the pump flow rate request signal 9 changes stepwise, the feed water flow rate adjusting valve opening command signal 16 is transmitted to the PI controller.
Since it is the output of 15, the signal is a signal obtained by multiplying the control constant set in the PI controller 15. Here, since the initial response of the feed water flow rate adjusting valve 17 is slow, the feed water flow rate adjusting valve 17 opens after a delay with respect to the feed water flow rate adjusting valve opening command signal 16, and therefore M-RF
The change of the M-RFP flow rate signal 12 indicating the flow rate of P5 is also delayed.

Since the M-RFP flow rate controller 6 is a closed loop control in which the M-RFP flow rate signal 12 is used as a feedback signal, the M-RFP flow rate signal 12 does not follow the pump flow rate request signal 9 so much that the change does not occur. If it is late, the feed water flow rate adjusting valve opening command signal 16 which is the output of the PI controller 15 is excessively output in the positive direction.

Therefore, the feed water flow rate adjusting valve 17 is also opened excessively, and the M-RFP flow rate signal 12 becomes larger than the pump flow rate request signal 9. Thus, when the M-RFP flow rate signal 12 becomes larger than the pump flow rate request signal 9, the feed water flow rate adjusting valve opening command signal 16 is output in the negative direction this time.

However, since the initial response of the feed water flow rate adjusting valve 17 is also slow here, the feed water flow rate adjusting valve 17 opens later than the feed water flow rate adjusting valve opening command signal 16, and therefore M
-The RFP flow rate signal 12 changes slowly. By continuing such behavior, the reactor feedwater flow rate fluctuates, and the steady fluctuation of the reactor water level increases due to the influence. Therefore,
In order to fundamentally solve this, it is necessary to improve the responsiveness of the feed water flow rate adjusting valve 17.

[0016]

The response speed and responsiveness of the feed water flow rate adjusting valve 17 are greatly affected by the function of the reactor water supply control in operating a nuclear power plant. Although it is an important parameter for the periodical maintenance of the valve 17, there was a problem that the function soundness could not be confirmed only in the periodical inspection performed about once a year.

Further, even when a test for confirming the soundness of this function is carried out, a lot of man-hours are required for attaching and detaching the temporarily installed measuring equipment, isolation work, and evaluation of test data. was there.

The object of the present invention is to confirm the response speed and responsiveness of the feed water flow rate adjusting valve simply by operating in the central operating room regardless of the operating state of the nuclear power plant and without provision of temporary measuring equipment. An object of the present invention is to provide a reactor water supply control device capable of achieving the above.

[0019]

In order to achieve the above object, a reactor water supply control apparatus according to the invention of claim 1 controls the reactor water level in the reactor pressure vessel to be constant over the entire output range of the reactor. In the reactor water supply control device, the test permission is granted from the plant condition to the electric motor drive reactor feed water pump flow controller, which controls the outlet flow rate of the electric motor drive water feed pump by adjusting the opening of the feed water flow adjustment valve. Step signal generator that outputs the step signal for the test given to the judging device and the feed water flow rate adjusting valve, and the signal switcher that switches between the opening command signal and the step signal of the water flow rate adjusting valve and the response of the water flow rate adjusting valve by the step signal It is characterized by being equipped with a transient phenomenon analyzer for analyzing speed and response, and displaying the analysis result on the water supply control system operation panel.

A reactor water supply control apparatus according to a second aspect of the present invention is a reactor water supply control apparatus for controlling the reactor water level in a reactor pressure vessel to be constant over the entire output range of the reactor.
Electric motor-driven reactor feedwater pump outlet flow rate control is performed by adjusting the feedwater flow rate adjustment valve opening, to a motor-driven nuclear reactor feedwater pump flow rate controller, and to a test permission judgment device and a feedwater flow rate adjustment valve that permits testing from plant conditions. Step signal generator that outputs the step signal for the given test and the response speed and responsiveness of the signal changer that switches the opening command signal and step signal of the feed water flow rate adjusting valve by the step signal and the water feed flow rate adjusting valve by the step signal It is characterized by including a transient phenomenon analyzer for analyzing the above and comparing with preset reference data or the like to judge the function of the water supply flow rate adjusting valve, and displaying the analysis result on the water supply control system operation panel.

[0021]

According to the invention described in claim 1, when the plant condition is satisfied by the command from the water supply control system operation panel, the test permission judging device outputs the test permission signal to the signal switching device, and the signal switching device outputs from the step signal generator. The step signal of is output to the feed water flow rate adjusting valve. This activates the water supply flow rate adjustment valve,
At this time, the function analysis of the feedwater flow rate adjusting valve is performed by the transient phenomenon analyzer from the response speed and responsiveness according to the opening command signal of the feedwater flow rate adjusting valve and the operating time, and the result is transmitted to the water feed control system operation panel. indicate.

According to the second aspect of the present invention, when the plant condition is satisfied by the command from the water supply control system operation panel, the test permission judging device outputs a test permission signal to the signal switching device, and the signal switching device outputs from the step signal generator. The step signal of is output to the feed water flow rate adjusting valve. This activates the feedwater flow rate adjusting valve.At this time, the function of the feedwater flow rate adjusting valve is analyzed in the transient phenomenon analyzer from the response speed and responsiveness according to the opening command signal of the feedwater flow rate adjusting valve and the operating time. The function is judged by comparing it with the set reference data, and the result is transmitted to the water supply control system operation panel and displayed.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. It should be noted that the same components as those in the above-described conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted. The first invention is
As shown in the block diagram of FIG. 1, an M-RFP flow rate controller 22 in a reactor water supply control device 21 is configured, and signals are communicated with a water supply control system operation panel 23.

That is, the M-RFP flow rate controller 22 inputs the pump flow rate request signal 9 from the main controller 2 and the M-RFP flow rate signal 12 which is a feedback signal of the M-RFP flow rate control loop, and an addition calculator 13 And the PI controller 15 and the signal switcher 24 that input the deviation signal 14 of this calculation result and output the feed water flow rate adjusting valve opening command signal 16, and test the feed water flow rate adjusting valve 17 from various conditions in the plant. A test permission judging device 25 for permitting is provided.

Further, in place of the feed water flow rate adjusting valve opening command signal 16, a step signal generator 26 for issuing a step-like signal for a responsiveness confirmation test, and a feed water flow rate adjusting valve 17 operated by the test step signal The transient phenomenon analyzer 27 analyzes the response speed and response from various data.

The signal switching unit 24 is the PI controller 15
Input the feed water flow rate adjusting valve opening command signal 16 from the test permission signal, the test permission signal 28 from the test permission determiner 25 and the step signal 29 which is the output signal of the step signal generator 26, and input the normal M-
During RFP flow rate control operation, feed water flow rate adjustment valve opening command signal 16
Is directly output to the feed water flow rate adjusting valve 17.

When the test permission signal 28 from the test permission determiner 25 is established, the step signal 29, which is the output signal of the step signal generator 26, is output to the water supply flow rate adjusting valve 17, thereby supplying water. The flow rate adjusting valve 17 operates following the signal selected by the signal switch 24, and the M-RFP flow rate signal 12 changes when the M-RFP 5 is in operation.

Further, the transient phenomenon analyzer 27 inputs the step signal 29 from the step signal generator 26 and the feed water flow rate adjusting valve opening signal 30 and analyzes the data in the step response test of the feed water flow rate regulating valve 17. The result is output to the water supply control system operation panel 23 as a display output signal 31.

Further, in the feed water control system operation panel 23, a series of command operations at the time of performing the feed water flow rate adjusting valve step response test are performed, and a test start signal 32 is output to the reactor feed water control device 21. In addition to being input to the step signal generator 26, the test result is input as a display output signal 31 and displayed to an inspector.

Next, with respect to the operation of the above-mentioned configuration, a step response test of the feed water flow rate adjusting valve 17 will be described as a surveillance test during the 100% rated output operation of the nuclear power plant. First, the feed water flow rate adjusting valve step response test mode is selected on the feed water control system operation panel 23. At this time, the test permission judging unit 25 judges from the operating state of the nuclear power plant whether or not the step response test of the feed water flow rate adjusting valve is possible based on various data inputted from the water supply control system.

The judgment condition at this time is, for example, MR
The FP5 is stopped and the M-RFP outlet valve 33 is fully closed. When this condition is satisfied, the test permission judgment device
The test permission signal 28 from 25 is established, which causes the PI
The feed water flow rate adjusting valve opening command signal 16 from the controller 15 is switched to the test step signal 29 from the step signal generator 26 in the signal switch 24.

Next, the feed water flow rate adjusting valve 17 is set to an arbitrary opening on the feed water control system operation panel 23, and the width of the step signal 29 is set. In this state, a step signal is sent to the water supply flow rate adjusting valve 17 by the test start signal 32 from the water supply control system operation panel 23.
When 29 is applied, the feed water flow rate adjusting valve 17 operates accordingly. The step signal 29 and the feed water flow rate adjusting valve opening signal 30 at this time are input to the transient phenomenon analyzer 27.

The characteristic diagram of FIG. 2 shows the trends of the step signal 29 and the feedwater flow rate adjusting valve opening signal 30 input to the transient phenomenon analyzer 27 during this test. Step signal 29 is time t
When input at 0, the feed water flow rate adjusting valve opening signal 30 representing the opening degree of the feed water flow rate adjusting valve 17 immediately rises to 100
100% at time ts after slightly overshooting
Set to ± 5%. During this process, the feedwater flow rate adjustment valve opening signal
The time when 30 reaches 10% is t10, the time when 90% reaches 90 is t90, the overshoot amount is 34, and the ± 5% settling time at time ts is 35.

In the transient phenomenon analyzer 27, the delay time 36 at the time t10 when the feedwater flow rate adjusting valve opening signal 30 becomes 10% from the time to, and from 10% to 90% (time t10 to t90).
Response time 37, and 0% to 100 ± 5% settling (time t
(o to ts) ± 5% settling time 38, and further, the overshoot amount 34 is analytically calculated and output as a display output signal 31, which is displayed on the water supply control system operation panel 23.

The inspector compares this result with past test data or reference data to determine the function of the feed water flow rate adjusting valve 17. After the end of the test, the signal switch 24 is switched from the step signal 29 to the feed water flow rate adjusting valve opening command signal 16 by the operation on the feed water control system operation panel 23 to restore the initial state.

In a second aspect of the invention, the transient phenomenon analyzer 27 provided in the M-RFP flow rate controller 22 in the reactor water supply control device 21 is provided with reference data of the function of the feed water flow rate adjusting valve 17 and past test data in advance. It is also possible to display the result on the water supply control system operation panel 23 by setting the above and making a comparison with the calculated data.

In the reactor water supply control device 21 of the present invention, M-
The RFP flow controller 22 and the signal switch 24 together with the test permission determiner 25, the step signal generator 26, and the transient phenomenon analyzer 27.
By adding the above, the response speed and responsiveness surveillance test in the feed water flow rate adjusting valve 17 can be performed regardless of the operating state of the nuclear power plant. Further, even when the nuclear power plant is stopped, since it is possible to perform the test in the same manner as the one embodiment,
The test work efficiency in the periodic inspection can be significantly improved.

[0038]

As described above, according to the present invention, regardless of the operating state of the nuclear power plant, no temporary measuring equipment is required, and the response of the feed water flow rate adjusting valve can be easily performed by the simple operation of the inspector in the central operating room. By confirming the speed and responsiveness, the operating function of the feedwater flow rate adjustment valve can be confirmed even during suspension, so the reliability of the reactor water supply control system of a nuclear power plant can be improved, and the quality and reliability of the feedwater flow rate adjustment valve can be ensured. The property is improved. Further, since maintenance is easy, there is an effect that the test work efficiency is improved and the work man-hours at the time of plant construction and periodic inspection are reduced.

[Brief description of drawings]

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

FIG. 2 is a characteristic diagram of a step signal and a feed water flow rate adjusting valve opening signal in the transient phenomenon analyzer according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional reactor water supply control device.

FIG. 4 is a block configuration diagram of a conventional M-RFP flow rate controller.

FIG. 5 is a characteristic diagram of the feedwater flow rate adjusting valve opening command signal and the opening degree of the feedwater flow rate adjusting valve when the response of the feedwater flow rate adjusting valve is normal.

FIG. 6 is a characteristic diagram of a feed water flow rate adjustment valve opening command signal and a degree of opening of the feed water flow rate adjustment valve when the response of the feed water flow rate adjustment valve is slow.

[Explanation of symbols]

1, 21 ... Reactor feed water control device, 2 ... Main controller, 3 ... Turbine drive reactor feed water pump (T-RFP), 4 ... T-R
FP flow controller, 5 ... Electric motor driven reactor feed water pump (M
-RFP), 6, 22 ... M-RFP flow rate controller, 7 ... Reactor blowdown adjustment valve controller, 8 ... Actual water level signal, 9 ... Pump flow rate request signal, 10 ... Rotation speed signal, 11 ... Water supply turbine, 12 ... M-RFP flow rate signal, 13 ... Addition calculator, 14 ... Deviation signal, 15 ... PI controller, 16 ... Feed water flow rate adjusting valve opening command signal, 17 ... Feed water flow rate adjusting valve, 18 ... Reactor blowdown flow rate Adjusting valve opening command signal, 19 ... Reactor blowdown adjusting valve, 20, 23 ... Water supply control system operation panel, 24 ... Signal changer,
25 ... Test permission judgment device, 26 ... Step signal generator, 27 ... Transient phenomenon analyzer, 28 ... Test permission signal, 29 ... Step signal,
30 ... Water supply flow rate adjusting valve opening signal, 31 ... Display output signal, 32
… Test start signal, 33… M-RFP outlet valve, 34… Overshoot amount, 35… ± 5% set point, 36… Delay time, 37… Response time, 38… ± 5% settling time.

Claims (2)

[Claims] 1. A reactor water supply control device for controlling the reactor water level in a reactor pressure vessel to be constant over the entire output range of the reactor. The electric motor driven reactor feed water pump flow controller adjusts the flow rate, and a step signal generator that outputs a step signal for the test given to the test permission judgment device and the feed water flow rate adjustment valve that gives the test permission from the plant conditions and the feed water flow rate adjustment It is equipped with a signal switcher that switches between the valve opening command signal and the step signal, and a transient phenomenon analyzer that analyzes the response speed and responsiveness of the feed water flow rate adjusting valve based on the step signal. A reactor water supply control device characterized by displaying. 2. A reactor water supply control device for controlling the reactor water level in the reactor pressure vessel to be constant over the entire output range of the reactor, in which a motor-driven reactor water supply pump outlet flow rate is controlled. The flow rate controller that drives the motor-driven reactor water supply pump controls the flow rate by the step signal generator and the step signal that outputs the step signal for the test that is given to the test permission judging device and the feed water flow rate adjusting valve that permits the test from the plant conditions. Adjusting the feed water flow rate by analyzing the response speed and responsiveness of the feed water flow rate adjusting valve by the signal switch and the step signal that switch between the opening command signal and the step signal of the feed water flow rate adjusting valve and comparing with preset reference data etc. A reactor water supply control device comprising a transient phenomenon analyzer for judging the function of a valve, and displaying the analysis result on a water supply control system operation panel.