Control system and method for load testing of isolation valves in nuclear power plant feedwater system

Abstract

This invention relates to a control system and method for load testing of isolation valves in nuclear power plant feedwater systems. The system includes a human-machine interface (HMI) unit and a logic configuration control unit located in the main control room. The HMI unit outputs start / stop control commands based on user-inputted start / stop control operations for the isolation valve load test, displays the execution steps of the load test based on sequential control step signals, and displays the test data. The logic configuration control unit performs logic configuration control based on the test operations performed by the field test equipment during the test and generates sequential control step signals. This invention allows for the sequential control logic of starting and displaying the isolation valve load test from the main control room, enabling effective test execution in the main control room, ensuring timely and accurate operation, reducing the workload of operating personnel, reducing on-site operation labor costs, significantly shortening test execution time, and minimizing human error.

Description

Technical Field

[0001] This invention relates to the technical field of nuclear power plant feedwater systems, and more specifically, to a control system and method for load testing of isolation valves in nuclear power plant feedwater systems. Background Technology

[0002] The load testing of isolation valves in the nuclear power plant feedwater system includes load testing of the low-pressure heater extraction steam isolation valve, the deaerator extraction steam isolation valve, and the deaerator feedwater isolation valve. Specifically, there are six tests: the isolation valve from extraction steam to low-pressure heater 3A (ABP402VV), the isolation valve from extraction steam to low-pressure heater 3B (ABP502VV), the isolation valve from extraction steam to low-pressure heater 4A (ABP404VV), the isolation valve from extraction steam to low-pressure heater 4B (ABP504VV), the deaerator extraction steam isolation valve (ADG002VV), and the deaerator feedwater isolation valve (CEX006VL). All these isolation valve tests require operation under load while the turbine generator is running; that is, the isolation valve must be closed and reopened under load.

[0003] Taking the isolation valve test of the steam extraction to the low-pressure heater 3A as an example, the test method is as follows: when the steam turbine generator is running, the on-site personnel press the close button of channel 1 on the test box of the local valve to verify that the valve is closed on-site. Then, they press the two open buttons at the same time to reopen the valve and verify that the valve is open. After the generator power and ACO water level are stable, the load test of the valve is completed.

[0004] However, the test requires one operator and one supervisor to operate and monitor the valve. The operator must also observe the local valve position indicator to verify that the valve's actual position meets the test requirements. The test procedure requires simultaneously pressing the open button to reopen the valve; any slight error could affect the valve's normal opening. Each valve requires testing through two logic channels. Due to the influence of on-site conditions and the environment, the current testing method carries the risk of human error. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a control system and method for load testing of isolation valves in a nuclear power plant feedwater system.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to construct a load test control system for isolation valves in a nuclear power plant feedwater system, including: a human-machine interaction unit and a logic configuration control unit installed in the main control room;

[0007] The human-machine interface unit outputs start-stop control commands to the field test equipment based on the start-stop control operation of the isolation valve under load test input by the user, and displays the execution steps of the isolation valve under load test and the test data of the isolation valve under load test according to the sequential control step signal output by the logic configuration control unit.

[0008] The logic configuration control unit is connected to the human-machine interaction unit and the field test equipment respectively. The logic configuration control unit performs logic configuration control according to the test operations performed by the field test equipment during the test and generates the sequential control step signal.

[0009] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the logic configuration control unit includes: a first channel load test logic module, a second channel load test logic module, and a test stop logic control module;

[0010] The first channel load test logic module performs logic configuration control on the sequential control steps of the isolation valve load test controlled by the first channel and generates the first channel sequential control step signal; the second channel load test logic module performs logic configuration control on the sequential control steps of the isolation valve load test controlled by the second channel and generates the second channel sequential control step signal; the test stop logic control module generates a test stop signal according to the test stop control command; the human-machine interaction unit is connected to the first channel load test logic module, the second channel load test logic module, and the test stop logic control module respectively, and the human-machine interaction unit displays the execution steps of the isolation valve load test in sequence according to the first channel sequential control step signal, the second channel sequential control step signal, and the test stop signal respectively.

[0011] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the first channel load test logic module includes: a sequential start logic module, a first channel isolation valve closing logic module, a first channel isolation valve opening logic module, and a first channel load test completion logic module;

[0012] The sequential start logic module outputs a sequential start control signal according to the start control command; the first channel isolation valve closing logic module performs logic configuration control according to the on-site test operation of closing the first channel isolation valve and generates a first channel isolation valve closing step signal; the first channel isolation valve opening logic module performs logic configuration control according to the on-site test operation of opening the first channel isolation valve and generates a first channel isolation valve opening step signal; the first channel load test completion logic module performs logic configuration control according to the on-site test operation of completing the first channel load test and generates a first channel load test completion step signal.

[0013] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the sequential start logic module includes: a first timer and a tenth RS trigger; the first channel isolation valve closing logic module includes: a first NOT gate, a second NOT gate, a first AND gate, a second AND gate, a third timer and a second RS trigger; the first channel isolation valve opening logic module includes: a third NOT gate, a third AND gate, a fourth AND gate, a fourth timer and a third RS trigger; the first channel load test completion logic module includes: a fifth timer and a fourth RS trigger.

[0014] The input terminal of the first timer is connected to the first channel start button in the human-machine interaction unit, the output terminal of the first timer is connected to the set input terminal of the tenth RS flip-flop, and the output terminal of the tenth RS flip-flop outputs the sequential start control signal; the input terminal of the first NOT gate is connected to the first field process signal, the output terminal of the first NOT gate is connected to the first input terminal of the first AND gate, the input terminal of the second NOT gate is connected to the second field process signal, the output terminal of the second NOT gate is connected to the second input terminal of the first AND gate, the first input terminal of the second AND gate is connected to the sequential start output signal, the second input terminal of the second AND gate is connected to the output terminal of the first AND gate, the output terminal of the second AND gate is connected to the input terminal of the third timer, the output terminal of the third timer is connected to the set input terminal of the second RS flip-flop, and the output terminal of the second RS flip-flop outputs the first channel isolation valve closing step signal;

[0015] The input of the third NOT gate is connected to the third field process signal; the output of the third NOT gate is connected to the first input of the third AND gate; the second input of the third AND gate is connected to the second field process signal; the output of the third AND gate is connected to the first input of the fourth AND gate; the second input of the fourth AND gate is connected to the first sequential control step output signal; the output of the fourth AND gate is connected to the input of the fourth timer; the output of the fourth timer is connected to the set input of the third RS flip-flop; and the output of the third RS flip-flop outputs the first channel isolation valve opening step signal. The input of the fifth timer is connected to the second sequential control step output signal; the output of the fifth timer is connected to the set input of the fourth RS flip-flop; and the output of the fourth RS flip-flop outputs the first channel load test completion step signal.

[0016] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the second channel load test logic module includes: a second channel isolation valve closing logic module, a second channel isolation valve opening logic module, and a second channel load test completion module;

[0017] The second channel isolation valve closing logic module performs logic configuration control based on the on-site test operation of closing the second channel isolation valve and generates the second channel isolation valve closing step signal; the second channel isolation valve opening logic module performs logic configuration control based on the on-site test operation of opening the second channel isolation valve and generates the second channel isolation valve opening step signal; the second channel load test completion logic module performs logic configuration control based on the on-site test operation of completing the second channel load test and generates the second channel load test completion step signal.

[0018] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the second channel isolation valve closing logic module includes: a thirteenth RS flip-flop, a fourth NOT gate, a fifth NOT gate, a fifth AND gate, a sixth AND gate, a second timer, and a fifth RS flip-flop; the second channel isolation valve opening logic module includes: a sixth NOT gate, a seventh AND gate, an eighth AND gate, a sixteenth timer, and a sixth RS flip-flop; the second channel load test completion module includes: a seventh timer and a seventh RS flip-flop.

[0019] The set input of the thirteenth RS flip-flop is connected to an acknowledgment signal, the reset input is connected to a stop signal, the output is connected to the first input of the sixth AND gate, the second input is connected to the third sequential control step output signal, the input of the fourth NOT gate is connected to the first field process signal, the output is connected to the first input of the fifth AND gate, the input is connected to the second field process signal, the output is connected to the second input of the fifth AND gate, the output is connected to the third input of the sixth AND gate, the output is connected to the input of the second timer, the output is connected to the set input of the fifth RS flip-flop, and the output of the fifth RS flip-flop outputs the second channel shutdown isolation. The signal outputs the valve opening step signal; the sixth NOT gate is connected to the third field process signal, the output of the sixth NOT gate is connected to the first input of the seventh AND gate, the second input of the seventh AND gate is connected to the second field process signal, the first input of the eighth AND gate is connected to the output of the seventh AND gate, the second input of the eighth AND gate is connected to the fourth sequential control step output signal, the output of the eighth AND gate is connected to the input of the sixteenth timer, the output of the sixteenth timer is connected to the set input of the sixth RS flip-flop, and the output of the sixth RS flip-flop outputs the second channel valve opening step signal; the input of the seventh timer is connected to the fifth sequential control step output signal, the output of the seventh timer is connected to the set input of the seventh RS flip-flop, and the output of the seventh RS flip-flop outputs the second channel load test completion step signal.

[0020] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the second channel load test logic module further includes: a delay waiting logic module; the delay waiting logic module performs logic configuration control according to the delay waiting operation on site and generates a delay waiting step signal.

[0021] In the load test control system for the isolation valve of the nuclear power plant feedwater system described in this invention, the delay waiting logic module includes: a first selector, a second selector, a third selector, a fourth selector, a fifth selector, a first subtractor, a second subtractor, a third subtractor, a fourth subtractor, a fifth subtractor, a first value acquisition module, a second value acquisition module, a third value acquisition module, a fourth value acquisition module, a fifth value acquisition module, a first divider, a second divider, a third divider, a fourth divider, a fifth divider, a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, a first OR gate, a ninth AND gate, an eleventh RS flip-flop, a tenth AND gate, a delay unit, an eighth timer, and an eighteenth RS flip-flop;

[0022] The input of the first selector is connected to a first monitoring signal; the output of the first selector is connected to the first input of the first subtractor; the second input of the first subtractor is connected to the first monitoring signal; the output of the first subtractor is connected to the input of the first value-retrieval module; the output of the first value-retrieval module is connected to the first input of the first divider; the second input of the first divider is connected to the output of the first selector; the output of the first divider is connected to the first input of the first comparator; the second input of the first comparator is connected to a reference value; and the output of the first comparator is connected to the first input of the first OR gate. The input of the second selector is connected to a second monitoring signal; the output of the second selector is connected to the first input of the second subtractor; the second input of the second subtractor is connected to the second monitoring signal; the output of the second subtractor is connected to the input of the second value-retrieval module; the output of the second value-retrieval module is connected to the first input of the second divider; the second input of the second divider is connected to the output of the second selector; the output of the second divider is connected to the first input of the second comparator; the second input of the second comparator is connected to a reference value; and the output of the second comparator is connected to the second input of the first OR gate.

[0023] The input terminal of the third selector is connected to the third monitoring signal, the output terminal of the third selector is connected to the first input terminal of the third subtractor, the second input terminal of the first subtractor is connected to the third monitoring signal, the output terminal of the third subtractor is connected to the input terminal of the third value acquisition module, the output terminal of the third value acquisition module is connected to the first input terminal of the third divider, the second input terminal of the third divider is connected to the output terminal of the third selector, the output terminal of the third divider is connected to the first input terminal of the third comparator, the second input terminal of the first comparator is connected to the reference value, and the output terminal of the third comparator is connected to the third input terminal of the first OR gate. The input terminal of the fourth selector is connected to the fourth monitoring signal, the output terminal of the fourth selector is connected to the first input terminal of the fourth subtractor, the second input terminal of the fourth subtractor is connected to the fourth monitoring signal, the output terminal of the fourth subtractor is connected to the input terminal of the fourth value acquisition module, the output terminal of the fourth value acquisition module is connected to the first input terminal of the fourth divider, the second input terminal of the fourth divider is connected to the output terminal of the fourth selector, the output terminal of the fourth divider is connected to the first input terminal of the fourth comparator, the second input terminal of the fourth comparator is connected to the reference value, and the output terminal of the fourth comparator is connected to the fourth input terminal of the first OR gate.

[0024] The input of the fifth selector is connected to the output signal of the first sequential control step; the output of the fifth selector is connected to the first input of the fifth subtractor; the second input of the fifth subtractor is connected to the output signal of the first sequential control step; the output of the fifth subtractor is connected to the input of the fifth value-taking module; the output of the fifth value-taking module is connected to the first input of the fifth divider; the second input of the fifth divider is connected to the output of the fifth selector; the output of the fifth divider is connected to the first input of the fifth comparator; the second input of the fifth comparator is connected to a reference value; and the output of the fifth comparator is connected to the fifth input of the first OR gate. The first input of the ninth AND gate is connected to the output of the first OR gate. The second input of the ninth AND gate is connected to the output signal of the sixth sequential control step. The output of the ninth AND gate is connected to the set input of the eleventh RS flip-flop. The reset input of the eleventh RS flip-flop is connected to the stop signal. The output of the eleventh RS flip-flop is connected to the first input of the tenth AND gate. The second input of the tenth AND gate is connected to the output of the delay unit. The input of the delay unit is connected to the output signal of the sixth sequential control step. The output of the tenth AND gate is connected to the input of the eighth timer. The output of the eighth timer is connected to the set input of the eighteenth RS flip-flop. The reset input of the eighteenth RS flip-flop is connected to the stop signal. The eighteenth RS flip-flop outputs the delay waiting step signal.

[0025] In the nuclear power plant feedwater system isolation valve load test control system of the present invention, the human-machine interface unit includes: a sequential control step display area, a button operation area, a parameter display area, and an isolation valve display area; the sequential control step display area displays the execution steps of the isolation valve load test according to the sequential control step signal output by the logic configuration control unit; the button operation area outputs start / stop control commands to the field test equipment according to the start / stop control operation of the isolation valve load test input by the user; the parameter display area displays the test data of the isolation valve load test; and the isolation valve display area displays the isolation valve currently performing the load test.

[0026] This invention also provides a method for controlling the load test of isolation valves in a nuclear power plant feedwater system, comprising the following steps:

[0027] The human-machine interface unit receives user input for the start-stop control operation of the isolation valve under load test, and outputs start-stop control commands to the field test equipment according to the start-stop control operation.

[0028] The logic configuration control unit performs logic configuration control and generates sequential control step signals based on the test operations performed by the field test equipment during the test.

[0029] The human-machine interface unit displays the execution steps of the isolation valve load test and the test data of the isolation valve load test according to the sequential control step signal.

[0030] The control system and method for load testing of isolation valves in nuclear power plant feedwater systems, as described in this invention, have the following beneficial effects: They include a human-machine interface unit and a logic configuration control unit located in the main control room. The human-machine interface unit outputs start-stop control commands based on user-inputted start-stop control operations for the isolation valve load test, displays the execution steps of the isolation valve load test according to sequential control step signals, and displays the test data of the isolation valve load test. The logic configuration control unit performs logic configuration control based on the test operations performed by the field test equipment during the test and generates sequential control step signals. This invention allows for the sequential control logic of starting and displaying the isolation valve load test from the main control room, enabling effective test execution in the main control room, ensuring timely and accurate operation, reducing the workload of operating personnel, reducing on-site operation labor costs, significantly shortening test execution time, and also reducing human error. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the human-machine interface unit of a specific embodiment of the isolation valve load test provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the logic configuration of the sequential start-up logic module provided by the present invention;

[0034] Figure 3 This is a schematic diagram of the logic configuration of the first channel shut-off isolation valve logic module provided by the present invention;

[0035] Figure 4 This is a schematic diagram of the logic configuration of the first channel opening isolation valve logic module provided by the present invention;

[0036] Figure 5 This is a schematic diagram of the logic configuration of the first channel load test completion logic module provided by the present invention;

[0037] Figure 6 This is a schematic diagram of the logic configuration of the second-channel shut-off isolation valve logic module provided by the present invention;

[0038] Figure 7 This is a schematic diagram of the logic configuration of the second-channel opening isolation valve logic module provided by the present invention;

[0039] Figure 8This is a schematic diagram of the logic configuration of the second channel load test completion module provided by the present invention;

[0040] Figure 9 This is a schematic diagram of the logic configuration of the delay waiting logic module provided by the present invention;

[0041] Figure 10 This is a schematic diagram of the logic configuration of the test stop indication logic module provided by the present invention;

[0042] Figure 11 This is a logic configuration diagram of faults, anomalies, and resets provided by the present invention;

[0043] Figure 12 This is a schematic flowchart of the control method for load testing of isolation valves in nuclear power plant feedwater systems provided by the present invention. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The nuclear power plant feedwater system isolation valve load test control system of this invention is based on digital technology and equipment. Through a corresponding screen and according to the periodic operation test procedures, under the condition of turbine generator operation, it establishes sequential control logic for starting / stopping the isolation valve load test via the DCS screen in the main control room (here, the DCS screen is the control screen of the digital instrumentation and control system). The sequential control logic for the isolation valve load test includes the sequential control logic for six tests: isolation valve ABP402VV for extraction steam to low-pressure heater 3A, isolation valve ABP502VV for extraction steam to low-pressure heater 3B, isolation valve ABP404VV for extraction steam to low-pressure heater 4A, isolation valve ABP504VV for extraction steam to low-pressure heater 4B, deaerator extraction steam isolation valve ADG002VV, and deaerator feedwater isolation valve CEX006VL. Specifically, the nuclear power plant feedwater system isolation valve load test control system provided in this embodiment includes a human-machine interface unit and a logic configuration control unit located in the main control room. The human-machine interface unit outputs start-stop control commands to the field test equipment based on the start-stop control operation of the isolation valve under load test input by the user. It also displays the execution steps of the isolation valve under load test and the test data based on the sequential control step signals output by the logic configuration control unit. The logic configuration control unit is connected to both the human-machine interface unit and the field test equipment. The logic configuration control unit performs logic configuration control and generates sequential control step signals based on the test operations performed by the field test equipment during the test.

[0046] In this embodiment of the invention, the logic configuration control unit can display the specific test operation process and steps of the field test equipment through the human-machine interface unit (i.e., DCS screen) located in the main control room. This allows the main control room operator to start and stop the isolation valve under load test on the main control room's human-machine interface unit, and simultaneously display relevant test data and steps during the test, making the operation more intuitive, clear, and effective. The entire test using this invention takes only a few minutes, requires no on-site personnel, greatly reducing the manpower burden on the operation site. Furthermore, the main control room operator can more accurately monitor the unit's status while performing regular tests.

[0047] Optionally, in this embodiment of the invention, the logic configuration control unit includes: a first-channel load test logic module, a second-channel load test logic module, and a test stop logic control module. The first-channel load test logic module performs logic configuration control on the sequential control steps of the load test of the isolation valve controlled through the first channel and generates a first-channel sequential control step signal; the second-channel load test logic module performs logic configuration control on the sequential control steps of the load test of the isolation valve controlled through the second channel and generates a second-channel sequential control step signal; the test stop logic control module generates a test stop signal according to a test stop control command. A human-machine interface unit is connected to the first-channel load test logic module, the second-channel load test logic module, and the test stop logic control module, respectively. The human-machine interface unit displays the execution steps of the load test of the isolation valve sequentially according to the first-channel sequential control step signal, the second-channel sequential control step signal, and the test stop signal.

[0048] Specifically, such as Figure 1 As shown, in this embodiment, the human-machine interface unit includes: a sequential control step display area 11, a button operation area 12, a parameter display area 13, and an isolation valve display area 14. The sequential control step display area 11 displays the execution steps of the isolation valve load test based on the sequential control step signals output by the logic configuration control unit. Specifically, in this embodiment, the sequential control step display area 11 can display the first channel sequential control step signal, the second channel sequential control step signal, and the test stop signal. The first channel sequential control step signal includes: the first channel isolation valve closing step signal, the first channel isolation valve opening step signal, and the first channel load test completion step signal. The second channel sequential control step signal includes: the second channel isolation valve closing step signal, the second channel isolation valve opening step signal, the second channel load test completion step signal, and a delay waiting step signal.

[0049] The following explanation uses the load test of the isolation valve ABP402VV, which extracts steam to the low-pressure heater 3A, as an example. Figure 1As shown, the signal for closing the isolation valve in the first channel is: Channel 1 is started with 001KG for a load test, closing ABP402VV, and simultaneously closing 401VV (where 401VV is the shut-off valve following ABP402VV). The signal for opening the isolation valve in the first channel is: Channel 1 is started with a load test, opening ABP402VV, and simultaneously opening 401VV. The signal for completing the load test in the first channel is: The load test in channel 1 is complete. The signal for closing the isolation valve in the second channel is: Channel 2 is started with 001KG ACK for a load test, closing ABP402VV, and simultaneously closing 401VV. The signal for opening the isolation valve in the second channel is: Channel 2 is started with a load test, opening ABP402VV, and simultaneously opening 401VV. The signal for completing the load test in the second channel is: The load test in channel 2 is complete. The delay signal is: Wait approximately 3 minutes until the generator power and the water level in the feedwater heater's condensate recovery system (ACO) stabilize. The test stop signal is: Test complete, ending this test.

[0050] Specifically, such as Figure 1 As shown, when the signal for closing the isolation valve in the first channel is received, the indicator light “01.” in the sequential control step display area 11 illuminates; when the signal for opening the isolation valve in the first channel is received, the indicator light “02.” in the sequential control step display area 11 illuminates; when the signal for completing the load test in the first channel is received, the indicator light “03.” in the sequential control step display area 11 illuminates; when the signal for closing the isolation valve in the second channel is received, the indicator light “04.” in the sequential control step display area 11 illuminates; when the signal for opening the isolation valve in the second channel is received, the indicator light “05.” in the sequential control step display area 11 illuminates; when the signal for completing the load test in the second channel is received, the indicator light “06.” in the sequential control step display area 11 illuminates; when the generator power and ACO water level stability signals are received, the indicator light “07.” in the sequential control step display area 11 illuminates; and when the test stop signal is received, the indicator light “08.” in the sequential control step display area 11 illuminates.

[0051] The button operation area 12 outputs start / stop control commands to the field test equipment based on the user-input start / stop control operation for the isolation valve load test. Optionally, in this embodiment of the invention, the button operation area 12 includes: a first channel start / stop button (i.e., a first channel start / stop button), a second channel start / stop button (i.e., a second channel start / stop button), a first channel load test completion indicator light, an abnormal indicator light, and a reset button. Wherein, as... Figure 1 As shown, the start / stop button for the first channel is 001KG, the start / stop button for the second channel is 001KG ACK, and the indicator light for the first channel's load test completion is CH1 OK. Further, as... Figure 1As shown, the indicator light for the second channel load test completion is located in the sequential control step display area 11, and the indicator light for the second channel load test completion is: CH2 OK. The parameter display area 13 displays the test data for the isolation valve load test. Specifically, as shown... Figure 1 As shown, the generator power and the water level of the feedwater heater's condensate recovery system can be displayed through parameter display area 13. Specifically, parameter display area 13 can display the trend of generator power and ACO water level. The displayed data points include: D2GME001MW (generator power (i.e., the output signal of the first sequential control step)), D2ACO001MN (liquid level of low-pressure heater condensate recovery tank 301BA (i.e., the first monitoring signal)), D2ACO002MN (liquid level of low-pressure heater condensate recovery tank 302BA (i.e., the second monitoring signal)), D2ACO003MN (liquid level of low-pressure heater ABP401RE (i.e., the third monitoring signal)), and D2ACO004MN (liquid level of low-pressure heater ABP402RE (i.e., the fourth monitoring signal)).

[0052] The isolation valve display area 14 displays the isolation valve currently undergoing a load test. Specifically, the isolation valve display area 14 is used to display the isolation valve currently undergoing a load test, such as... Figure 1 As shown, the isolation valve currently performing the load test is ABP402VV. Optionally, in this embodiment of the invention, the first channel load test logic module includes: a sequential start logic module, a first channel isolation valve closing logic module, a first channel isolation valve opening logic module, and a first channel load test completion logic module. Specifically, the sequential start logic module outputs a sequential start control signal according to the start control command; the first channel isolation valve closing logic module performs logic configuration control based on the on-site first channel isolation valve closing test operation and generates a first channel isolation valve closing step signal; the first channel isolation valve opening logic module performs logic configuration control based on the on-site first channel isolation valve opening test operation and generates a first channel isolation valve opening step signal; the first channel load test completion logic module performs logic configuration control based on the on-site first channel load test completion test operation and generates a first channel load test completion step signal. Specifically, as shown... Figure 2 As shown, the sequential start logic module includes: a first timer (i.e., R_TP_1 in the diagram) and a tenth RS flip-flop (i.e., R_RS_10 in the diagram). Figure 3 As shown, the logic module for closing the isolation valve in the first channel includes: a first NOT gate (NOT1 in the figure), a second NOT gate (NOT2 in the figure), a first AND gate (AND1 in the figure), a second AND gate (AND2 in the figure), a third timer (R_TP_3 in the figure), and a second RS flip-flop (R_RS_2 in the figure). Figure 4As shown, the logic module for opening the isolation valve in the first channel includes: a third NOT gate (NOT3 in the figure), a third AND gate (AND3 in the figure), a fourth AND gate (AND4 in the figure), a fourth timer (R_TP_4 in the figure), and a third RS flip-flop (R_RS_3 in the figure). Figure 5 As shown, the logic module for completing the load test of the first channel includes: the fifth timer (i.e., R_TP_5 in the figure) and the fourth RS flip-flop (i.e., R_RS_4 in the figure). Figures 2 to 5 As shown:

[0053] The input of the first timer is connected to the first channel start button in the human-machine interaction unit (i.e., connected to D2ABP001KG.KCM_MON). The output of the first timer is connected to the set input of the tenth RS flip-flop. The output of the tenth RS flip-flop outputs the sequential start control signal (i.e., D2ABP402KS_00.DI). The input of the first NOT gate is connected to the first field process signal (D2ABP402VV6D01), and the output of the first NOT gate is connected to the first input of the first AND gate. The input of the second NOT gate is connected to the second field process signal (D2ABP401VV5D01_XAN63), and the output of the second NOT gate is connected to the second input of the first AND gate. The first input of the second AND gate is connected to the sequential control start output signal (D2ABP402KS_00.DV). The second input of the second AND gate is connected to the output of the first AND gate. The output of the second AND gate is connected to the input of the third timer. The output of the third timer is connected to the set input of the second RS flip-flop. The output of the second RS flip-flop outputs the first channel isolation valve closing step signal (D2ABP402KS_01.DI). The input of the third NOT gate is connected to the third field process signal (D2APB402VV4D01). The output of the third NOT gate is connected to the first input of the third AND gate. The second input of the third AND gate is connected to the second field process signal. The output of the third AND gate is connected to the first input of the fourth AND gate. The second input of the fourth AND gate is connected to the first sequential control step output signal (D2ABP402KS_01.DV). The output of the fourth AND gate is connected to the input of the fourth timer. The output of the fourth timer is connected to the set input of the third RS flip-flop. The output of the third RS flip-flop outputs the first channel isolation valve opening step signal (D2ABP402KS_02.DI). The input of the fifth timer is connected to the second sequential control step output signal (D2ABP402KS_02.DV). The output of the fifth timer is connected to the set input of the fourth RS flip-flop. The output of the fourth RS flip-flop outputs the first channel load test completion step signal (D2ABP402KS_03.DI).

[0054] Optionally, in this embodiment of the invention, the second-channel load test logic module includes: a second-channel isolation valve closing logic module, a second-channel isolation valve opening logic module, and a second-channel load test completion module. Specifically, the second-channel isolation valve closing logic module performs logic configuration control based on the on-site test operation of closing the second-channel isolation valve and generates a second-channel isolation valve closing step signal; the second-channel isolation valve opening logic module performs logic configuration control based on the on-site test operation of opening the second-channel isolation valve and generates a second-channel isolation valve opening step signal; the second-channel load test completion logic module performs logic configuration control based on the on-site test operation of completing the second-channel load test and generates a second-channel load test completion step signal. Specifically, as shown... Figure 6 As shown, the logic module for closing the isolation valve in the second channel includes: a thirteenth RS flip-flop (R_RS_13 in the diagram), a fourth NOT gate (NOT4 in the diagram), a fifth NOT gate (NOT5 in the diagram), a fifth AND gate (AND5 in the diagram), a sixth AND gate (AND6 in the diagram), a second timer (R_TP_2 in the diagram), and a fifth RS flip-flop (R_RS_5 in the diagram). Figure 7 As shown, the logic module for opening the isolation valve in the second channel includes: a sixth NOT gate (NOT6 in the figure), a seventh AND gate (AND7 in the figure), an eighth AND gate (AND8 in the figure), a sixteenth timer (R_TP_16 in the figure), and a sixth RS flip-flop (R_RS_6 in the figure). Figure 8 As shown, the second channel load test completion module includes: the seventh timer (i.e., R_TP_7 in the figure) and the seventh RS trigger (i.e., R_RS_7 in the figure). Figures 6 to 8 As shown:

[0055] The set input of the thirteenth RS flip-flop is connected to the confirmation signal (D2ABP001KGACT.ONP), the reset input of the thirteenth RS flip-flop is connected to the stop signal (D2ABP001KG.KCM_MOF, where the stop signal is the manual stop signal for sequential control), the output of the thirteenth RS flip-flop is connected to the first input of the sixth AND gate, the second input of the sixth AND gate is connected to the third sequential control step output signal (D2ABP402KS_03.DV), the input of the fourth NOT gate is connected to the first field process signal, the output of the fourth NOT gate is connected to the first input of the fifth AND gate, the input of the fifth NOT gate is connected to the second field process signal, the output of the fifth NOT gate is connected to the second input of the fifth AND gate, the output of the fifth AND gate is connected to the third input of the sixth AND gate, the output of the sixth AND gate is connected to the input of the second timer, the output of the second timer is connected to the set input of the fifth RS flip-flop, and the output of the fifth RS flip-flop outputs the second channel isolation valve closing step signal (D2ABP402KS_04.DI). The sixth NOT gate is connected to the third field process signal. The output of the sixth NOT gate is connected to the first input of the seventh AND gate. The second input of the seventh AND gate is connected to the second field process signal. The first input of the eighth AND gate is connected to the output of the seventh AND gate. The second input of the eighth AND gate is connected to the fourth sequential control step output signal (D2ABP402KS_04.DV). The output of the eighth AND gate is connected to the input of the sixteenth timer. The output of the sixteenth timer is connected to the set input of the sixth RS flip-flop. The output of the sixth RS flip-flop outputs the second channel isolation valve opening step signal (D2ABP402KS_05.DI). The input of the seventh timer is connected to the fifth sequential control step output signal (D2ABP402KS_05.DV). The output of the seventh timer is connected to the set input of the seventh RS flip-flop. The output of the seventh RS flip-flop outputs the second channel load test completion step signal (D2ABP402KS_06.DI). Optionally, in this embodiment of the invention, the second channel load test logic module further includes: a delay waiting logic module; wherein, the delay waiting logic module performs logic configuration control according to the delay waiting operation on site and generates a delay waiting step signal. For example... Figure 9As shown, the delay-wait logic module includes: a first selector (SEL1 in the diagram), a second selector (SEL2 in the diagram), a third selector (SEL3 in the diagram), a fourth selector (SEL4 in the diagram), a fifth selector (SEL5 in the diagram), a first subtractor (SUB1 in the diagram), a second subtractor (SUB2 in the diagram), a third subtractor (SUB3 in the diagram), a fourth subtractor (SUB4 in the diagram), a fifth subtractor (SUB5 in the diagram), a first value retrieval module (ABS1 in the diagram), a second value retrieval module (ABS2 in the diagram), a third value retrieval module (ABS3 in the diagram), a fourth value retrieval module (ABS4 in the diagram), a fifth value retrieval module (ABS5 in the diagram), and a first divider (DIV_SH_1 in the diagram). The system consists of a second divider (DIV_SH_2), a third divider (DIV_SH_3), a fourth divider (DIV_SH_4), a fifth divider (DIV_SH_5), a first comparator (GE1), a second comparator (GE2), a third comparator (GE3), a fourth comparator (GE4), a fifth comparator (GE5), a first OR gate (OR1), a ninth AND gate (AND9), an eleventh RS flip-flop (R_RS_11), a tenth AND gate (AND10), a delay unit (R_TON_2), an eighth timer (R_TP_8), and an eighteenth RS flip-flop (R_RS_18). The first, second, third, fourth, and fifth value-taking modules are all used to obtain absolute values.

[0056] Specifically, such as Figure 9As shown, the input of the first selector is connected to the first monitoring signal (D2ACO001MN_XSN33), the output of the first selector is connected to the first input of the first subtractor, the second input of the first subtractor is connected to the first monitoring signal, the output of the first subtractor is connected to the input of the first value acquisition module, the output of the first value acquisition module is connected to the first input of the first divider, the second input of the first divider is connected to the output of the first selector, the output of the first divider is connected to the first input of the first comparator, the second input of the first comparator is connected to the reference value, and the output of the first comparator is connected to the first input of the first OR gate. The input of the second selector is connected to the second monitoring signal (D2ACO002MN_XSN33), the output of the second selector is connected to the first input of the second subtractor, the second input of the second subtractor is connected to the second monitoring signal, the output of the second subtractor is connected to the input of the second value acquisition module, the output of the second value acquisition module is connected to the first input of the second divider, the second input of the second divider is connected to the output of the second selector, the output of the second divider is connected to the first input of the second comparator, the second input of the second comparator is connected to the reference value, and the output of the second comparator is connected to the second input of the first OR gate. The input of the third selector is connected to the third monitoring signal (D2ACO003MN_XSN33). The output of the third selector is connected to the first input of the third subtractor. The second input of the first subtractor is connected to the third monitoring signal. The output of the third subtractor is connected to the input of the third value acquisition module. The output of the third value acquisition module is connected to the first input of the third divider. The second input of the third divider is connected to the output of the third selector. The output of the third divider is connected to the first input of the third comparator. The second input of the first comparator is connected to the reference value. The output of the third comparator is connected to the third input of the first OR gate. The input of the fourth selector is connected to the fourth monitoring signal (D2ACO004MN_XSN33), the output of the fourth selector is connected to the first input of the fourth subtractor, the second input of the fourth subtractor is connected to the fourth monitoring signal, the output of the fourth subtractor is connected to the input of the fourth value acquisition module, the output of the fourth value acquisition module is connected to the first input of the fourth divider, the second input of the fourth divider is connected to the output of the fourth selector, the output of the fourth divider is connected to the first input of the fourth comparator, the second input of the fourth comparator is connected to the reference value, and the output of the fourth comparator is connected to the fourth input of the first OR gate.The input of the fifth selector is connected to the output signal of the first sequential control step (D2ABP402KS_01.DV). The output of the fifth selector is connected to the first input of the fifth subtractor. The second input of the fifth subtractor is connected to the output signal of the first sequential control step. The output of the fifth subtractor is connected to the input of the fifth value retrieval module. The output of the fifth value retrieval module is connected to the first input of the fifth divider. The second input of the fifth divider is connected to the output of the fifth selector. The output of the fifth divider is connected to the first input of the fifth comparator. The second input of the fifth comparator is connected to the reference value. The output of the fifth comparator is connected to the fifth input of the first OR gate. The first input of the ninth AND gate is connected to the output of the first OR gate. The second input of the ninth AND gate is connected to the output signal of the sixth sequential control step (D2ABP402KS_06.DV). The output of the ninth AND gate is connected to the set input of the eleventh RS flip-flop. The reset input of the eleventh RS flip-flop is connected to the stop signal. The output of the eleventh RS flip-flop is connected to the first input of the tenth AND gate. The second input of the tenth AND gate is connected to the output of the delay unit. The input of the delay unit is connected to the output signal of the sixth sequential control step. The output of the tenth AND gate is connected to the input of the eighth timer. The output of the eighth timer is connected to the set input of the eighteenth RS flip-flop. The reset input of the eighteenth RS flip-flop is connected to the stop signal. The eighteenth RS flip-flop outputs a delay waiting step signal. Specifically, as follows... Figure 10 As shown, the test stop logic control module includes: the eleventh timer (i.e., R_TP_11 in the figure) and the twelfth RS flip-flop (i.e., R_RS_12 in the figure). Figure 10 As shown, the input of the eleventh timer is connected to the output signal of the seventh sequential control step (D2ABP402KS_07.DV), the output of the eleventh timer is connected to the set input of the twelfth RS flip-flop, the reset input of the twelfth RS flip-flop is connected to the stop signal, and the output of the twelfth RS flip-flop outputs the test stop signal.

[0057] In this embodiment of the invention, the logic configuration control unit further includes a fault / abnormality and reset logic module. Specifically, as shown... Figure 11As shown, the fault and reset logic module includes: a second OR gate (OR2 in the figure), a ninth RS flip-flop (R_RS_9 in the figure), and a switching device (KGP_1 in the figure). The first input of the second OR gate is connected to the second fault signal (fail_02), the second input of the second OR gate is connected to the first fault signal (fail_01), the set input of the ninth RS flip-flop is connected to the output of the second OR gate, the reset input of the ninth RS flip-flop is connected to the ONP pin of the switching device, and the KG pin of the switching device is connected to the D2ABP402KGSCR (command signal). During the test execution, if an abnormality occurs, the fault indicator light in the button operation area 12 of the human-machine interaction unit will light up, and the corresponding sequential control indicator light will flash. The operator presses the stop button, finds and eliminates the fault, resets the fault by pressing the reset button, and re-executes the test until the test is successfully completed. In this embodiment of the invention, the RS flip-flop used is an RS flip-flop with reset bistable power, which can achieve reset optimization. Its truth table is as follows:

[0058] RESET1 (Reset Input) SET (Set Input) Output (Q(n+1)) 0 0 Q(n) 0 1 1 1 0 0

[0059] It should be noted that, Figures 2 to 11 This explanation uses D2ABP402VV as an example. When performing load tests on other isolation valves, Figures 2 to 11 The corresponding signals need to be converted to the signals of the corresponding isolation valves. Specifically, the load test screen for the low-pressure heater extraction steam isolation valve D2ABP402VV is D2ABP402YBD, and its layout and contents are as follows... Figure 1 As shown. In the database logical configuration design, to implement the relevant content of D2ABP402YBD, the following related database content needs to be added.

[0060]

[0061] In the table above, DM2 is a data type, KG represents an algorithm function module with inputs, outputs, and intermediate variables. It is used to receive operation instructions from the operation interface as input and issue corresponding instructions. SC is also an algorithm function module that implements sequential control function (i.e., sequential control function). Multiple SC blocks are used consecutively. It receives the completion status of the previous SC block, judges the pass condition or allow condition, and issues instructions after the pass condition or allow condition is met. REAL is a real number.

[0062] To enable operators in the main control room to perform tests intuitively and clearly within the DCS, this invention features a test screen configured and named ABP402YBD (ABP402VV Test). ABP001KG from ABP001YCD is moved to the ABP402YBD screen for test start signals in the DCS. A logic configuration of waiting 3 minutes to determine generator power and ACO level stability is added to verify the impact of valve closure and reopening under load on unit parameter changes and the correctness of test execution. On the ABP402YBD screen, when the operator executes the test, they press the test button ABP001KG. The test proceeds automatically according to the original logic. Each step is completed, and the corresponding step indicator lights up green until all test steps are completed. The operator then presses the stop button, all step indicators turn off, and the test is complete. During the test, the real-time values ​​and trends of generator power and ACO level can be observed in the "Generator Power and ACO Level Monitoring" table on the screen, allowing for real-time monitoring of relevant unit parameters and effective execution of the test while maintaining overall control of the unit's status. This invention adds a test screen and names it ABP402YBD. The screen content refers to the point name corresponding to the reference symbol or related screens such as ABP001YCD. It adds a logic configuration to wait 3 minutes to determine the stability of generator power and ACO water level. The parameters and equipment status are the same as ABP001YCD (field test equipment), which are the actual status of the unit.

[0063] For other isolation valves in the nuclear power plant feedwater system, such as the low-pressure heater 3B extraction steam isolation valve ABP502VV, the low-pressure heater 4A extraction steam isolation valve ABP404VV, the low-pressure heater 4B extraction steam isolation valve ABP504VV, the deaerator extraction steam isolation valve ADG002VV, and the deaerator feedwater isolation valve CEX006VL, the ABP402VV test can be referenced. Its screen configuration naming is as follows:

[0064] Serial Number name Screen configuration Station Number 1 Low-pressure heater 3B extraction steam isolation valve ABP502VV under load test ABP502YBD 58 2 Low-pressure heater 4A extraction steam isolation valve ABP404VV under load test ABP404YBD 58 3 Low-pressure heater 4B extraction isolation valve ABP504VV under load test ABP504YBD 58 4. Deaerator extraction steam isolation valve ADG002VV under load operation test ADG002YBD 59 5. Deaerator feedwater isolation valve CEX006VL under load test CEX006YBD 57

[0065] Among them, ABP502YBD, ABP404YBD, and ABP504YBD are similar to ABP402YBD and will not be listed here. The deaerator extraction steam isolation valve ADG002VV load operation test screen (ADG002YBD) includes 9 sequential control steps. Specifically: 01. Start the load test of channel 1 via 001KG and close ADG002VV; 02. Open ADG002VV for the load test of channel 1, carefully observe the changes in nuclear power, and prevent over-power; 03. The load test of channel 1 is complete; 04. Wait approximately 3 minutes for the generator power and test-related parameters to stabilize; 05. Start the load test of channel 2 and close ADG002VV; 06. Open ADG002VV for the load test of channel 2, carefully observe the changes in nuclear power, and prevent over-power; 07. The load test of channel 2 is complete; 08. Wait approximately 3 minutes for the generator power and test-related parameters to stabilize; 09. The test is complete. Please end this test via 001KG.

[0066] The load test screen for the deaerator feedwater isolation valve CEX006VL (CEX006YBD) includes 9 sequential control steps. Specifically: 0.1. Start the load test on channel 1 via 001KG, closing CEX006VL; 02. Open CEX006VL for the load test on channel 1; 03. Load test on channel 1 completes; 04. Wait approximately 1 minute for the relevant test parameters to stabilize; 05. Close CEX006VL for the load test on channel 2; 06. Open CEX006VL for the load test on channel 2; 07. Load test on channel 2 completes; 08. Wait approximately 1 minute for the relevant test parameters to stabilize; 09. Test complete. Please end this test via 001KG.

[0067] The database for the load test sequence control of the low-pressure heater 3B extraction isolation valve ABP502VV is shown in the table below:

[0068]

[0069] The database for the load test sequence control of the low-pressure heater 4A extraction isolation valve ABP404VV is shown in the table below:

[0070]

[0071]

[0072] The database for the load test sequence control of the low-pressure heater 4B extraction isolation valve ABP504VV is shown in the table below:

[0073]

[0074]

[0075] The database for the load-bearing operation test sequence control of the deaerator extraction steam isolation valve ADG002VV is shown in the table below:

[0076]

[0077] The database for the load test sequence control of the deaerator feedwater isolation valve CEX006VL is shown in the table below:

[0078]

[0079]

[0080] Furthermore, such as Figure 12 As shown, the present invention also provides a control method for load testing of isolation valves in a nuclear power plant feedwater system, specifically including the following steps: Step S21. Receive the start / stop control operation of the isolation valve load test input by the user through a human-machine interface unit, and output start / stop control commands to the field test equipment according to the start / stop control operation; Step S22. The logic configuration control unit performs logic configuration control according to the test operation executed by the field test equipment during the test and generates sequential control step signals; Step S23. The human-machine interface unit displays the execution steps of the isolation valve load test and the test data of the isolation valve load test according to the sequential control step signals.

[0081] Specifically, the load test control method for the isolation valve of the nuclear power plant feedwater system can be implemented based on the load test control system for the isolation valve of the nuclear power plant feedwater system disclosed in the embodiments of this invention.

[0082] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0083] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0084] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0085] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant feedwater system isolation valve load test control system characterized by, include: The human-machine interface unit and logic configuration control unit are located in the main control room; The human-machine interface unit outputs start-stop control commands to the field test equipment based on the start-stop control operation of the isolation valve under load test input by the user, and displays the execution steps of the isolation valve under load test and the test data of the isolation valve under load test according to the sequential control step signal output by the logic configuration control unit. The logic configuration control unit is connected to the human-machine interaction unit and the field test equipment respectively. The logic configuration control unit performs logic configuration control according to the test operation performed by the field test equipment during the test and generates the sequential control step signal. The logic configuration control unit includes: a first channel load test logic module, a second channel load test logic module, and a test stop logic control module; The first channel load test logic module performs logic configuration control on the sequential control steps of the load test of the isolation valve controlled by the first channel and generates the first channel sequential control step signal; the second channel load test logic module performs logic configuration control on the sequential control steps of the load test of the isolation valve controlled by the second channel and generates the second channel sequential control step signal; the test stop logic control module generates a test stop signal according to the test stop control command; The first channel load test logic module includes: a sequential start logic module, a first channel isolation valve closing logic module, a first channel isolation valve opening logic module, and a first channel load test completion logic module. The sequential start logic module outputs a sequential start control signal according to a start control command. The first channel isolation valve closing logic module performs logic configuration control based on the on-site test operation of closing the first channel isolation valve and generates a first channel isolation valve closing step signal. The first channel isolation valve opening logic module performs logic configuration control based on the on-site test operation of opening the first channel isolation valve and generates a first channel isolation valve opening step signal. The first channel load test completion logic module performs logic configuration control based on the on-site test operation of completing the first channel load test and generates a first channel load test completion step signal. The second channel load test logic module includes: a second channel isolation valve closing logic module, a second channel isolation valve opening logic module, and a second channel load test completion module; the second channel isolation valve closing logic module performs logic configuration control based on the on-site test operation of closing the second channel isolation valve and generates a second channel isolation valve closing step signal; the second channel isolation valve opening logic module performs logic configuration control based on the on-site test operation of opening the second channel isolation valve and generates a second channel isolation valve opening step signal; the second channel load test completion logic module performs logic configuration control based on the on-site test operation of completing the second channel load test and generates a second channel load test completion step signal. The human-machine interaction unit is connected to the first channel load test logic module, the second channel load test logic module, and the test stop logic control module, respectively. The human-machine interaction unit displays the execution steps of the isolation valve load test in sequence according to the first channel sequential control step signal, the second channel sequential control step signal, and the test stop signal.

2. The nuclear power plant feedwater system isolation valve loaded test control system of claim 1, wherein, The sequential start logic module includes: a first timer and a tenth RS flip-flop; the first channel isolation valve closing logic module includes: a first NOT gate, a second NOT gate, a first AND gate, a second AND gate, a third timer, and a second RS flip-flop; the first channel isolation valve opening logic module includes: a third NOT gate, a third AND gate, a fourth AND gate, a fourth timer, and a third RS flip-flop; the first channel load test completion logic module includes: a fifth timer and a fourth RS flip-flop; The input terminal of the first timer is connected to the first channel start button in the human-machine interaction unit, the output terminal of the first timer is connected to the set input terminal of the tenth RS flip-flop, and the output terminal of the tenth RS flip-flop outputs the sequential start control signal; the input terminal of the first NOT gate is connected to the first field process signal, the output terminal of the first NOT gate is connected to the first input terminal of the first AND gate, the input terminal of the second NOT gate is connected to the second field process signal, the output terminal of the second NOT gate is connected to the second input terminal of the first AND gate, the first input terminal of the second AND gate is connected to the sequential start output signal, the second input terminal of the second AND gate is connected to the output terminal of the first AND gate, the output terminal of the second AND gate is connected to the input terminal of the third timer, the output terminal of the third timer is connected to the set input terminal of the second RS flip-flop, and the output terminal of the second RS flip-flop outputs the first channel isolation valve closing step signal; The input of the third NOT gate is connected to the third field process signal; the output of the third NOT gate is connected to the first input of the third AND gate; the second input of the third AND gate is connected to the second field process signal; the output of the third AND gate is connected to the first input of the fourth AND gate; the second input of the fourth AND gate is connected to the first sequential control step output signal; the output of the fourth AND gate is connected to the input of the fourth timer; the output of the fourth timer is connected to the set input of the third RS flip-flop; and the output of the third RS flip-flop outputs the first channel isolation valve opening step signal. The input of the fifth timer is connected to the second sequential control step output signal; the output of the fifth timer is connected to the set input of the fourth RS flip-flop; and the output of the fourth RS flip-flop outputs the first channel load test completion step signal.

3. The nuclear power plant feedwater system isolation valve load test control system according to claim 1, characterized in that, The second channel isolation valve closing logic module includes: a thirteenth RS flip-flop, a fourth NOT gate, a fifth NOT gate, a fifth AND gate, a sixth AND gate, a second timer, and a fifth RS flip-flop; the second channel isolation valve opening logic module includes: a sixth NOT gate, a seventh AND gate, an eighth AND gate, a sixteenth timer, and a sixth RS flip-flop; the second channel load test completion module includes: a seventh timer and a seventh RS flip-flop. The set input of the thirteenth RS flip-flop is connected to an acknowledgment signal, the reset input is connected to a stop signal, the output is connected to the first input of the sixth AND gate, the second input is connected to the third sequential control step output signal, the input of the fourth NOT gate is connected to the first field process signal, the output is connected to the first input of the fifth AND gate, the input is connected to the second field process signal, the output is connected to the second input of the fifth AND gate, the output is connected to the third input of the sixth AND gate, the output is connected to the input of the second timer, the output is connected to the set input of the fifth RS flip-flop, and the output of the fifth RS flip-flop outputs the second channel shutdown isolation. The signal outputs the valve opening step signal; the sixth NOT gate is connected to the third field process signal, the output of the sixth NOT gate is connected to the first input of the seventh AND gate, the second input of the seventh AND gate is connected to the second field process signal, the first input of the eighth AND gate is connected to the output of the seventh AND gate, the second input of the eighth AND gate is connected to the fourth sequential control step output signal, the output of the eighth AND gate is connected to the input of the sixteenth timer, the output of the sixteenth timer is connected to the set input of the sixth RS flip-flop, and the output of the sixth RS flip-flop outputs the second channel valve opening step signal; the input of the seventh timer is connected to the fifth sequential control step output signal, the output of the seventh timer is connected to the set input of the seventh RS flip-flop, and the output of the seventh RS flip-flop outputs the second channel load test completion step signal.

4. The nuclear power plant feedwater system isolation valve load test control system according to claim 1, characterized in that, The second channel load test logic module also includes a delay waiting logic module; the delay waiting logic module performs logic configuration control according to the delay waiting operation on site and generates delay waiting step signals.

5. The nuclear power plant feedwater system isolation valve load test control system according to claim 4, characterized in that, The delay waiting logic module includes: a first selector, a second selector, a third selector, a fourth selector, a fifth selector, a first subtractor, a second subtractor, a third subtractor, a fourth subtractor, a fifth subtractor, a first value retrieval module, a second value retrieval module, a third value retrieval module, a fourth value retrieval module, a fifth value retrieval module, a first divider, a second divider, a third divider, a fourth divider, a fifth divider, a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, a first OR gate, a ninth AND gate, an eleventh RS flip-flop, a tenth AND gate, a delay unit, an eighth timer, and an eighteenth RS flip-flop; The input of the first selector is connected to a first monitoring signal; the output of the first selector is connected to the first input of the first subtractor; the second input of the first subtractor is connected to the first monitoring signal; the output of the first subtractor is connected to the input of the first value-retrieval module; the output of the first value-retrieval module is connected to the first input of the first divider; the second input of the first divider is connected to the output of the first selector; the output of the first divider is connected to the first input of the first comparator; the second input of the first comparator is connected to a reference value; and the output of the first comparator is connected to the first input of the first OR gate. The input of the second selector is connected to a second monitoring signal; the output of the second selector is connected to the first input of the second subtractor; the second input of the second subtractor is connected to the second monitoring signal; the output of the second subtractor is connected to the input of the second value-retrieval module; the output of the second value-retrieval module is connected to the first input of the second divider; the second input of the second divider is connected to the output of the second selector; the output of the second divider is connected to the first input of the second comparator; the second input of the second comparator is connected to a reference value; and the output of the second comparator is connected to the second input of the first OR gate. The input terminal of the third selector is connected to the third monitoring signal, the output terminal of the third selector is connected to the first input terminal of the third subtractor, the second input terminal of the first subtractor is connected to the third monitoring signal, the output terminal of the third subtractor is connected to the input terminal of the third value acquisition module, the output terminal of the third value acquisition module is connected to the first input terminal of the third divider, the second input terminal of the third divider is connected to the output terminal of the third selector, the output terminal of the third divider is connected to the first input terminal of the third comparator, the second input terminal of the first comparator is connected to the reference value, and the output terminal of the third comparator is connected to the third input terminal of the first OR gate. The input terminal of the fourth selector is connected to the fourth monitoring signal, the output terminal of the fourth selector is connected to the first input terminal of the fourth subtractor, the second input terminal of the fourth subtractor is connected to the fourth monitoring signal, the output terminal of the fourth subtractor is connected to the input terminal of the fourth value acquisition module, the output terminal of the fourth value acquisition module is connected to the first input terminal of the fourth divider, the second input terminal of the fourth divider is connected to the output terminal of the fourth selector, the output terminal of the fourth divider is connected to the first input terminal of the fourth comparator, the second input terminal of the fourth comparator is connected to the reference value, and the output terminal of the fourth comparator is connected to the fourth input terminal of the first OR gate. The input of the fifth selector is connected to the output signal of the first sequential control step; the output of the fifth selector is connected to the first input of the fifth subtractor; the second input of the fifth subtractor is connected to the output signal of the first sequential control step; the output of the fifth subtractor is connected to the input of the fifth value-taking module; the output of the fifth value-taking module is connected to the first input of the fifth divider; the second input of the fifth divider is connected to the output of the fifth selector; the output of the fifth divider is connected to the first input of the fifth comparator; the second input of the fifth comparator is connected to a reference value; and the output of the fifth comparator is connected to the fifth input of the first OR gate. The first input of the ninth AND gate is connected to the output of the first OR gate. The second input of the ninth AND gate is connected to the output signal of the sixth sequential control step. The output of the ninth AND gate is connected to the set input of the eleventh RS flip-flop. The reset input of the eleventh RS flip-flop is connected to the stop signal. The output of the eleventh RS flip-flop is connected to the first input of the tenth AND gate. The second input of the tenth AND gate is connected to the output of the delay unit. The input of the delay unit is connected to the output signal of the sixth sequential control step. The output of the tenth AND gate is connected to the input of the eighth timer. The output of the eighth timer is connected to the set input of the eighteenth RS flip-flop. The reset input of the eighteenth RS flip-flop is connected to the stop signal. The eighteenth RS flip-flop outputs the delay waiting step signal.

6. The nuclear power plant feedwater system isolation valve load test control system according to any one of claims 1-5, characterized in that, The human-machine interaction unit includes: a sequential control step display area, a button operation area, a parameter display area, and an isolation valve display area; The sequential control step display area displays the execution steps of the isolation valve load test according to the sequential control step signal output by the logic configuration control unit; the key operation area outputs start / stop control commands to the field test equipment according to the start / stop control operation of the isolation valve load test input by the user; the parameter display area displays the test data of the isolation valve load test; and the isolation valve display area displays the isolation valve currently performing the load test.

7. A method for controlling the load test of isolation valves in a nuclear power plant feedwater system, characterized in that, Includes the following steps: The human-machine interface unit receives user input for the start-stop control operation of the isolation valve under load test, and outputs start-stop control commands to the field test equipment according to the start-stop control operation. The logic configuration control unit performs logic configuration control and generates sequential control step signals based on the test operations performed by the field test equipment during the test; the logic configuration control unit includes: a first channel load test logic module, a second channel load test logic module, and a test stop logic control module; The first channel load test logic module performs logical configuration control on the sequential control steps of the load test of the isolation valve controlled by the first channel and generates the first channel sequential control step signal; the second channel load test logic module performs logical configuration control on the sequential control steps of the load test of the isolation valve controlled by the second channel and generates the second channel sequential control step signal; the test stop logic control module generates a test stop signal according to the test stop control command; the first channel load test logic module includes: a sequential control start logic module, a first channel isolation valve closing logic module, a first channel isolation valve opening logic module, and a first channel load test completion logic module; the sequential control start logic module outputs a sequential control start control signal according to the start control command; the first channel isolation valve closing logic module performs logical configuration control on the field test operation of closing the isolation valve of the first channel and generates the first channel isolation valve closing step signal; the first channel isolation valve opening logic module performs logical configuration control on the field test operation of opening the isolation valve of the first channel and generates the first channel isolation valve opening step signal; the first channel load test completion logic module performs logical configuration control on the field test operation of completing the load test of the first channel and generates the first channel load test completion step signal; The second channel load test logic module includes: a second channel isolation valve closing logic module, a second channel isolation valve opening logic module, and a second channel load test completion module; the second channel isolation valve closing logic module performs logic configuration control based on the on-site test operation of closing the second channel isolation valve and generates a second channel isolation valve closing step signal; the second channel isolation valve opening logic module performs logic configuration control based on the on-site test operation of opening the second channel isolation valve and generates a second channel isolation valve opening step signal; the second channel load test completion logic module performs logic configuration control based on the on-site test operation of completing the second channel load test and generates a second channel load test completion step signal. The human-machine interface unit displays the execution steps of the isolation valve load test and the test data of the isolation valve load test according to the sequential control step signal; The human-machine interaction unit is connected to the first channel load test logic module, the second channel load test logic module, and the test stop logic control module, respectively. The human-machine interaction unit displays the execution steps of the isolation valve load test in sequence according to the first channel sequential control step signal, the second channel sequential control step signal, and the test stop signal.

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