KR102571200B1 - Evaluation method for impact of abnormal operation of pumps and valves - Google Patents

Abstract

The present invention relates to a method for evaluating the effect of abnormal operation of pumps and valves, wherein a control device operates a pump to generate hydraulic pressure in a pipe, and when the hydraulic pressure is generated by the pump, the flow rate in the pipe is measured through a flow meter, When a certain flow rate is circulated, the control device performs at least one operation of sudden pump stop or rapid closing of the valve to block the flow path, so that a plurality of pressure meters provided at predetermined positions in the pipe measure the pressure in the pipe, and each When the pressure measured from the pressure measuring device exceeds the system's maximum acceptance pressure, the control device performs at least one operation of restarting the pump or opening the valve, and the monitoring device checks the differential pressure of the pump and leakage of the valve to determine whether there is an abnormality. When an abnormality is detected by detecting an abnormality, the control device stops driving at least one of the pump and the valve, and then counts the number of sudden pump stops or valve sudden closures to determine the number of sudden pump stops, the number of sudden closures of valves, pressure, and flow rate. Efficiency and reliability can be improved in safe operation management of nuclear power plant systems by deriving pump and valve performance, operation time, operation frequency, operation possibility, operation time, and system safety.

Description

Effect evaluation method for abnormal operation of pumps and valves {EVALUATION METHOD FOR IMPACT OF ABNORMAL OPERATION OF PUMPS AND VALVES}

The present invention relates to a method for evaluating the effect of abnormal operation of pumps and valves, and measures the number of times of sudden stop of pumps and sudden closures of valves due to abnormal operation of pumps and valves, thereby affecting the repeated stoppages of pumps and valves. It is about a technique for evaluating.

Safety-related pumps and valves installed in nuclear power plants must perform as designed without any abnormalities under any conditions. However, physical devices such as pumps and valves not only deteriorate as the number of uses increases, but also cause serious damage to pipes, supports, or system fluid storage tanks when abnormal operations are repeated.

In order to prevent such an abnormal situation from occurring, a test is being conducted to evaluate the soundness of the system by applying the operating pressure and maximum acceptance pressure of the pump and valve.

However, in the conventional test method, a calibrated pressure gauge applied within the pressure range of the valve to be tested is installed on the pump to check the pump's pressure boosting state, abnormality in the pump, pressure maintaining state, etc. before the start of each test. The downside is that there is a delay.

In addition, since the valves installed to ensure the safety of the system differ in size and capacity, separate test preparation time is required for the configuration of the pressurized test line applied to the valve. have difficulty doing

In addition, there is a problem in that an inaccurate pressure increase state due to manual manipulation occurs when all preparations for the test are performed manually, and the operator arbitrarily increases the pressure to the test pressure using a pump.

In order to solve this problem, it is urgent to develop a technology that evaluates the effect of abnormal operation of pumps and valves on the system.

The present invention relates to abnormal operation of pumps and valves, which can evaluate the impact on abnormal operation of a system used in a nuclear power plant by measuring the number of times of sudden stop of the pump and sudden closing of the valve due to abnormal operation of the pump and valve. Impact assessment methods can be provided.

A method for evaluating the effect of abnormal operation of pumps and valves according to an aspect of the present invention includes a hydraulic pressure generating step in which a control device operates a pump to generate hydraulic pressure in a pipe; a flow rate measurement step of measuring a flow rate in a pipe through a flow meter when hydraulic pressure is generated by the pump; When a certain flow rate is circulated, the control device performs at least one operation of sudden pump stop or rapid closing of the valve to block the flow path; a pressure measuring step in which at least one pressure measuring device provided at a predetermined position in the pipe measures the pressure in the pipe; When the pressure measured from each pressure measuring device exceeds the system's maximum acceptance pressure, the control device performs at least one operation of restarting the pump or opening the valve, and the monitoring device checks the differential pressure of the pump and leakage of the valve An abnormality detecting step of detecting an abnormality; When an abnormality is detected, the control device may include an emergency stop step of stopping driving of at least one of the pump and the valve.

Preferably, a counting step of counting the number of sudden stop of the pump or sudden closing of the valve and transmitting the counting step to the monitoring device may be further included.

Preferably, a display that derives the pump and valve performance, operating time, operating frequency, operating possibility, operating time, and system safety based on the number of times of sudden stop of the pump, the number of sudden closing of valves, pressure, and flow rate, and displays them on the monitoring device. Further steps may be included.

Preferably, the flow path blocking step may repeat sudden stop and restart of the pump and sudden closing and opening of the valve until the measured pressure exceeds the maximum accepted pressure of the system.

Preferably, in the flow path blocking step, sudden stop and restart of the pump and sudden closing and opening of the valve may be repeated until the differential pressure of the pump is less than a predetermined level of the design differential pressure or leakage of the valve is confirmed.

According to the present invention, it is possible to improve efficiency and reliability in safe operation management of a nuclear power plant system by measuring the number of times, pressure, and flow rate for sudden stop of pumps and sudden closing of valves due to abnormal operation of pumps and valves.

1 is a schematic diagram schematically illustrating an environment for evaluating effects on abnormal operation of pumps and valves according to an embodiment.
2 is a flow chart showing a procedure for evaluating the effect on pump and valve abnormal operation according to an embodiment.
3 is a flowchart showing in detail the procedure for evaluating the effect on the sudden stop of the pump according to the first embodiment.
4 is a flowchart showing in detail a procedure for evaluating the effect of sudden closure of a valve according to the second embodiment.

Hereinafter, a method for evaluating the effect on abnormal operation of pumps and valves according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to an operator's intention or practice. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

The objects and effects of the present invention can be naturally understood or more clearly understood by the following description, and the objects and effects of the present invention are not limited only by the following description. In addition, in describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 is a schematic diagram schematically illustrating an environment for evaluating effects on abnormal operation of pumps and valves according to an embodiment.

As shown in Figure 1, the environment for evaluating the effect on the abnormal operation of the pump 200 and the valve 300 according to an embodiment is the control device 100, the pump 200, the valve 300, the flow meter ( 400), a pressure measuring device 500, a monitoring device 600, and a cooler 700.

The control device 100 communicates with the monitoring device 600 and can control the operation of the pump 200 and the opening and closing of the valve 300.

The pump 200 can create hydraulic pressure in the pipe to circulate the fluid, the valve 300 is provided in the discharge part to open or block the fluid so that it can circulate in the main flow path, and the flow meter 400 can circulate the fluid in the pipe. My flow rate information can be measured and transmitted to the monitoring device 600. A plurality of pressure measuring devices 500 are provided at predetermined positions in the pipe to transmit pressure information measured at each position to the monitoring device 600, and the monitoring device 600 measures the flow rate from the flow measuring device 400. Information and pressure information measured by the pressure measuring instrument 500 may be received and displayed. The cooler 700 may cool heat generated from circulating fluid.

2 is a flowchart illustrating a procedure for evaluating an effect on abnormal operation of pumps and valves according to an embodiment.

As shown in FIG. 2, the order of evaluating the effect on the abnormal operation of the pump 200 and the valve 300 according to an embodiment is a hydraulic pressure generation step (S100), a flow rate measurement step (S200), and a flow path blocking step (S300). ), a pressure measurement step (S400), an abnormality detection step (S500), an emergency stop step (S600), and a counting step (S700).

In the hydraulic pressure generating step (S100), the controller 100 may operate the pump 200 to generate hydraulic pressure in the pipe. At this time, the fluid circulates in the pipe due to the pump 200, but depending on whether the valve 300 is opened or closed, the main flow path may be circulated and the recirculation flow path may be circulated.

In the flow rate measuring step (S200), when hydraulic pressure is generated due to the pump 200, the flow meter 400 may measure the flow rate in the pipe. At this time, the measured flow rate information may be transmitted to the monitoring device 600 .

In the passage blocking step (S300), when a certain flow rate is circulated, the control device 100 performs at least one operation of sudden stop of the pump 200 or sudden closing of the valve 300 so that the passage may be blocked. At this time, the flow path blocked due to the rapid closure of the valve 300 is the main flow path, and the fluid circulating in the pipe due to the blocking of the main flow path may be circulated through the recirculation flow path. In addition, the temperature and pressure of the fluid circulating through the recirculation passage may increase due to the absence of the cooler 700 .

In the pressure measuring step (S400), at least one pressure measuring device 500 at a predetermined position in the pipe may measure the pressure in the pipe. At this time, the measured pressure information in the pipe may be transmitted to the monitoring device 600. If the pressure information measured from each pressure measuring device 500 is less than the maximum acceptance pressure of the system, the controller 100 restarts the pump 200 and opens the valve 300, and circulates a certain amount of flow to the main flow path. After doing so, the pump 200 is suddenly stopped and the valve 300 is suddenly closed to block the flow path. That is, the sudden stop and restart of the pump 200 and the sudden closing and opening of the valve 300 may be repeated until the measured pressure exceeds the maximum accepted pressure of the system.

In the abnormality detection step (S500), when the pressure measured from each pressure measuring device 500 exceeds the maximum acceptance pressure of the system, the control device 100 performs at least one operation of restarting the pump 200 or opening the valve 300. And, the monitoring device can detect abnormality by checking the differential pressure of the pump and the leakage of the valve. At this time, if the differential pressure of the pump 200 exhibits performance of 90% or less than the design differential pressure of the pump, it may be determined that an abnormal situation has occurred. In addition, when leakage of the valve 300 is confirmed, it may be determined that an abnormal situation has occurred.

In the emergency stop step (S600), when an abnormality is detected, the controller 100 may stop driving at least one of the pump 200 and the valve 300. When the measured pressure exceeds the system's maximum capacity pressure but no abnormality is detected, the control device 100 restarts the pump 200 and opens the valve 300 so that the fluid in the pipe can circulate to the main flow path. And, the sudden stop and restart of the pump 200 and the rapid closing and opening of the valve 300 may be repeated until an abnormality is detected.

In the counting step (S700), the number of times of sudden stop of the pump 200 or sudden closing of the valve 300 may be counted and transmitted to the monitoring device 600. At this time, the number of sudden stop of the pump 200 and sudden closing of the valve 300 may be the number of times until an abnormal situation occurs.

In the display step (S900), the number of sudden stops of the pump 200, the number of sudden closures of the valve 300, the measured pressure, and the performance of the pump 200 and the valve 300 with the measured flow rate, operation time, number of operations, and operation Possibility, operating time, and system safety may be derived and displayed on the monitoring device 600.

The above-described procedure for evaluating the effect on abnormal operation of pumps and valves shows the overall flow, and will be described in detail according to the embodiments of FIGS. 3 and 4.

3 is a flowchart showing a sequence for the sudden stop of the pump according to the first embodiment.

As shown in FIG. 3, the flow for the sudden stop of the pump 200 according to the first embodiment operates the pump 200, opens the valve 300, circulates the fluid in the main flow path, and has a certain amount for a predetermined time. After maintaining the circulation of the fluid, the pump 200 may be suddenly stopped. After a predetermined time, the pump 200 is restarted, and the pressure in the pipe is measured to determine whether the measured pressure exceeds the system's maximum acceptable pressure. If the pressure in the pipe exceeds the system's maximum pressure, it can be checked whether the differential pressure of the pump 200 exhibits performance of 90% or more of the design differential pressure after restarting the pump. When the differential pressure of the pump 200 is lowered to 90% or less of the design differential pressure, the operation of the pump 200 and the valve 300 is stopped. Here, when the pressure in the pipe is lower than the maximum pressure of the system, the circulation of the fluid is maintained, and the sudden stop and restart of the pump 200 are repeated again. If the differential pressure of the pump 200 does not decrease to 90% or less than the design differential pressure, the valve 300 is checked for leaks, and if the valve 300 leaks, the pump 200 and the valve 300 are operated. to stop If the leakage of the valve 300 is not confirmed, the circulation of the fluid is maintained again, and then the sudden stop and restart of the pump 200 are repeated. In the repeated process, the number of times the pump 200 suddenly stops is counted, and when the pump 200 and the valve 300 stop operating, the number of times the pump 200 suddenly stops can be measured.

4 is a flowchart showing a sequence for sudden closing of a valve according to a second embodiment.

As shown in FIG. 4, the flow for sudden closure of the valve 300 according to the second embodiment operates the pump 200, opens the valve 300, and circulates the fluid in the main flow path for a predetermined time. After maintaining the circulation of the fluid for a while, the valve 300 is suddenly closed. Due to the closing of the valve 300, the fluid circulates through the circulation passage. In the circulation passage, the temperature and pressure of the fluid increase due to the absence of the cooler 700 . At this time, it is checked whether the pressure in the pipe exceeds the maximum capacity pressure of the system, and if the pressure in the pipe exceeds the maximum capacity pressure of the system, it is checked whether the differential pressure of the pump 200 exhibits performance of 90% or more of the design differential pressure, and the pump ( 200) is lowered to 90% or less of the design differential pressure, the operation of the pump 200 and the valve 300 is stopped. Here, when the system's maximum accommodating pressure is not exceeded, the valve 300 is opened to maintain the circulation of the fluid, and the rapid closing and opening of the valve 300 are repeated again. When the differential pressure of the pump 200 is 90% or more of the design differential pressure, leakage of the valve 300 is checked, and when leakage of the valve 300 occurs, the operation of the pump 200 and the valve 300 is stopped. If there is no abnormality in the valve 300, the valve 300 is opened again to maintain the circulation of the fluid, and then the sudden stop and restart of the valve 300 are repeated. In the repeated process, the number of times the valve 300 is suddenly closed is counted, and the number of times the valve 300 is suddenly closed can be measured when the operation of the pump 200 and the valve 300 is stopped.

Although the present invention has been described in detail through representative embodiments, those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. will be. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by all changes or modified forms measured from the claims and equivalent concepts as well as the claims to be described later.

100: control device 200: pump
300: valve 400: flow meter
500: pressure measuring device 600: monitoring device
700: cooler
210: main pump 230: auxiliary circulation pump
310: main valve 330: auxiliary circulation valve

Claims (5)

A hydraulic pressure generation step in which a control device operates a pump to generate hydraulic pressure in a pipe;
a flow rate measurement step of measuring a flow rate in a pipe through a flow meter when hydraulic pressure is generated by the pump;
When a certain flow rate is circulated, the control device performs at least one operation of sudden pump stop or rapid closing of the valve to block the flow path;
a pressure measuring step in which at least one pressure measuring device provided at a predetermined position in the pipe measures the pressure in the pipe;
When the pressure measured from each pressure measuring device exceeds the system's maximum acceptance pressure, the control device performs at least one operation of restarting the pump or opening the valve, and the monitoring device checks the differential pressure of the pump and leakage of the valve An abnormality detecting step of detecting an abnormality;
An emergency stop step in which the control device stops driving at least one of a pump and a valve when an abnormality is detected,
The method of evaluating the effect on abnormal operation of the pump and valve further comprising a counting step of counting the number of times of the sudden stop of the pump or the sudden close of the valve and transmitting the count to the monitoring device. delete According to claim 1,
Further comprising a display step of deriving the pump and valve performance, operating time, operating frequency, operating possibility, operating time, and system safety based on the number of sudden stop of the pump, the number of sudden closing of the valve, pressure, and flow rate, and displaying them on the monitoring device. A method for evaluating the effect of abnormal operation of pumps and valves
According to claim 1,
In the flow path blocking step, the impact on abnormal operation of pumps and valves, characterized in that the sudden stop and restart of the pump and the rapid closing and opening of the valve are repeated until the measured pressure exceeds the maximum accepted pressure of the system Evaluation method.
According to claim 1,
In the abnormal operation of the pump and valve, characterized in that the flow path blocking step repeats the sudden stop and restart of the pump and the rapid closing and opening of the valve until the differential pressure of the pump is less than a certain level of the design differential pressure or the leakage of the valve is confirmed. impact assessment method.