C22 signal authenticity judgment method, storage medium and equipment

Abstract

The invention relates to a C22 signal authenticity judgment method, a storage medium and equipment. The method comprises the following steps: S11, determining a secondary maximum value of a steam turbine load of a second loop, respectively determining protection average temperatures of a first loop, a second loop and a third loop, and determining a minimum value of the protection average temperatures; and S12, whether a protection probe pre-judgment signal is generated or not is judged according to the actual deviation between the minimum value of the protection average temperature and the expected temperature value. Wherein the expected temperature value is determined according to a corresponding relation curve of the secondary maximum value of the steam turbine load and the expected temperature value. And S13, according to the C22 signal, the protection probe prejudges the occurrence condition of the signal, and outputs and displays the judgment result of the authenticity of the C22 signal. According to the method, the credibility of the C22 signal can be automatically judged, and the C22 true and false judgment process can be more scientifically and efficiently realized. According to the method, timely and effective support can be provided for the operation value, and unit state deterioration and even unacceptable risks and consequences caused by untimely intervention or wrong intervention are practically avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power true or false signal judgment, and in particular to a C22 signal true or false judgment method, storage medium and device. Background Art

[0002] Nuclear power units have numerous instrumentation and control loop components that generate the primary circuit average temperature low signal (C22 signal). Failure in any of these components could potentially trigger a false C22 trigger, significantly impacting unit operation. For example, according to feedback from one nuclear power plant, during a fault in a primary circuit temperature bypass instrument (i.e., 2RCP050MT), the primary circuit pressure briefly exceeded the operating specifications. This C22 instrumentation and control loop failure resulted in a false C22 signal, making it difficult for operators to effectively determine whether the C22 signal was genuine. This, in turn, led to a significant degree of unit load rejection.

[0003] Feedback from a unit's primary-circuit temperature bypass instrument (L3RCP059MT) triggering a C22 signal due to a fault indicates that a false C22 signal triggered by a fault can significantly impact the unit if inappropriate control measures are taken. Simulator training also revealed that operators were unable to promptly and accurately determine whether a C22 signal was real or false, leading to erroneous intervention measures.

[0004] This shows that transient intervention in false C22 signals is extremely difficult and poses a huge challenge to operators. Simply improving operator capabilities and strengthening training will not fundamentally and permanently resolve this problem. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method, storage medium and device for determining whether a C22 signal is true or false in view of the above-mentioned defects.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for judging the authenticity of a C22 signal, wherein the C22 signal is a low average temperature signal of a circuit, comprising the following steps:

[0007] S11. Determine the second maximum value of the turbine load of the secondary circuit, and respectively determine the average protection temperatures of the primary, secondary, and tertiary circuits, and determine the minimum value of the average protection temperatures therefrom;

[0008] S12, judging whether to generate a protection probe pre-judgment signal according to the actual deviation between the minimum protection average temperature value and the expected temperature value;

[0009] Wherein, the expected temperature value is determined according to a curve of correspondence between the second largest value of the steam turbine load and the expected temperature value;

[0010] S13. According to the C22 signal and the occurrence of the protection probe prediction signal, the judgment result of whether the C22 signal is true or false is output and displayed.

[0011] Furthermore, in the method for determining the authenticity of the C22 signal of the present invention, step S12 includes:

[0012] Determine whether the actual deviation between the minimum protection average temperature value and the expected temperature value is consistent with the standard deviation;

[0013] If so, a protection probe prediction signal is generated;

[0014] The standard deviation is determined according to a standard deviation curve of the expected temperature value changing with turbine load power.

[0015] Furthermore, in the C22 signal authenticity determination method of the present invention, the method further includes:

[0016] S21, respectively determining the control average temperature of the first loop, the second loop, and the third loop;

[0017] S22. There are three criteria:

[0018] Criterion 1: The temperature probes of each loop control circuit do not drift downward;

[0019] Criterion 2: The deviation between the protection average temperatures of each loop is less than the absolute value of the preset deviation value;

[0020] Criterion 3: The temperature of each loop drops simultaneously;

[0021] When the above three criteria are met, a temperature trend prediction signal is generated;

[0022] Step S13 includes:

[0023] According to the occurrence of the C22 signal, the protection probe prediction signal and the temperature trend prediction signal, the judgment result of whether the C22 signal is true or false is output and displayed.

[0024] Furthermore, in the C22 signal authenticity determination method of the present invention, the criterion 1 includes:

[0025] Criterion 1-1: The difference between the control average temperature of a loop and the protection average temperature of a loop is greater than the preset deviation value;

[0026] Criteria 1-2: The difference between the control average temperature of the second loop and the protection average temperature of the second loop is greater than the preset deviation value;

[0027] Criteria 1-3: The difference between the control average temperature of the three loops and the protection average temperature of the three loops is greater than the preset deviation value;

[0028] When all the above criteria are met, it is determined that the temperature probes controlled by each loop have no downward drift.

[0029] Furthermore, in the C22 signal authenticity determination method of the present invention, the criterion 3 includes:

[0030] Criterion 3-1: The difference between the control average temperature of a loop and the expected temperature value is less than the preset deviation value;

[0031] Criterion 3-2: The difference between the protection average temperature of a loop and the expected temperature value is less than the preset deviation value;

[0032] Criterion 3-3: The difference between the controlled average temperature of the second loop and the expected temperature value is less than the preset deviation value;

[0033] Criterion 3-4: The difference between the protection average temperature of the second loop and the expected temperature value is less than the preset deviation value;

[0034] Criterion 3-5: The difference between the controlled average temperature of the three loops and the expected temperature value is less than the preset deviation value;

[0035] Criterion 3-6: The difference between the three-loop protection average temperature and the expected temperature value is less than the preset deviation value;

[0036] When at least five of the above criteria are met, it is determined that the temperatures of the various loops drop simultaneously.

[0037] Furthermore, in the C22 signal authenticity determination method of the present invention, in step S13, the following steps are included:

[0038] If the C22 signal, the protection probe prediction signal, and the temperature trend prediction signal all appear, it is determined that the unit is truly cold and the C22 signal is a true signal;

[0039] If the C22 signal and the temperature trend prediction signal appear, and the protection probe prediction signal does not appear, it is determined that the unit is truly cold and the C22 signal is a true signal;

[0040] If the C22 signal and the protection probe prediction signal appear, and the temperature trend prediction signal does not appear, it is determined that the unit is truly cold and the C22 signal is a true signal;

[0041] If the C22 signal appears and the protection probe prediction signal and the temperature trend prediction signal do not appear, it is determined that the unit is truly not cold and the C22 signal is a false signal.

[0042] Furthermore, in the C22 signal truth judgment method described in the present invention, the protection average temperature is the arithmetic mean of the hot segment temperature and the cold segment temperature of the corresponding loop measured by the RCP loop protection channel temperature measuring instrument; and / or, the control average temperature is the arithmetic mean of the hot segment temperature and the cold segment temperature of the corresponding loop measured by the RCP loop control channel temperature measuring instrument.

[0043] Furthermore, in the C22 signal authenticity judgment method of the present invention, the judgment result is displayed on a C22 auxiliary judgment screen; the C22 auxiliary judgment screen is also provided with an investment or withdrawal button, and the method further includes:

[0044] When it is necessary to enter the extended operation phase of the unit, the user receives the start / stop instruction generated by triggering the start / stop button, and in response to the start / stop instruction, the C22 auxiliary judgment screen is deactivated.

[0045] In addition, the present invention also provides a computer-readable storage medium, which stores a computer program. The computer program is suitable for being loaded by a processor to execute the steps of the above-mentioned C22 signal authenticity judgment method.

[0046] In addition, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the above-mentioned C22 signal authenticity judgment method by calling the computer program stored in the memory.

[0047] The C22 signal authenticity determination method, storage medium, and device of the present invention have the following beneficial effects: The present invention can automatically determine the credibility of the C22 signal, ensuring a more scientific and efficient C22 authenticity determination process. It can also provide timely and effective support for operational values, effectively avoiding deterioration of unit status due to untimely or erroneous intervention, which could lead to unacceptable risks and consequences. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0049] Figure 1 2 is a flow chart of a method for determining the authenticity of a C22 signal according to a first embodiment of the present invention;

[0050] Figure 2 2 is a flow chart of a method for determining the authenticity of a C22 signal according to a second embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the C22 signal generation logic architecture of the related art;

[0052] Figure 4is a schematic diagram of the protection probe prediction signal generation logic of some embodiments of the present invention;

[0053] Figure 5 is a schematic diagram of the temperature trend prediction signal generation logic of some embodiments of the present invention;

[0054] Figure 6 Schematic diagram of the C22 auxiliary judgment screen in some embodiments of the present invention;

[0055] Figure 7 This is a schematic diagram of the interface for activating the C22 auxiliary judgment screen eject command in some embodiments of the present invention. DETAILED DESCRIPTION

[0056] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or component referred to must have a specific direction, and therefore cannot be understood as a limitation of the present invention. It should also be noted that the relevant codes of the embodiments of the present invention: MT represents a temperature measuring instrument; RCP represents a reactor coolant system; RGL represents a control rod control system; GRE represents a turbine speed control system; GRE022 / 023 / 024MP represents the turbine speed control system inlet pressure (i.e., turbine load); GCT-C represents a turbine bypass exhaust system (exhaust to the condenser). RGL401GD represents a function of the average temperature of a single circuit as a function of the power of the random group.

[0057] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0058] like Figure 1 As shown, in the first embodiment of the method for determining the authenticity of the C22 signal of the present invention, the method includes the following steps:

[0059] S11. Determine the second maximum value of the turbine load of the secondary circuit, and respectively determine the protection average temperatures of the primary circuit, the secondary circuit, and the tertiary circuit, and determine the minimum value of the protection average temperature therefrom.

[0060] Specifically, regarding the secondary maximum turbine load value, the secondary circuit uses three turbine inlet pressure instruments to measure the turbine load. This embodiment of the present invention obtains the secondary circuit turbine load values ​​measured by the three turbine inlet pressure instruments, compares the values ​​measured by the three instruments, and determines the secondary maximum value, i.e., the secondary maximum turbine load value. It will be appreciated that in this embodiment, the secondary maximum turbine load value is also the median value, and selecting a representative median value enhances data accuracy. The secondary maximum turbine load value can range from 0 to 100%.

[0061] It should be noted that the C22 signal is a low signal for the average temperature of the first loop. The reactor's primary loop consists of three loops: loop one, loop two, and loop three. The reactor's primary loop temperature is measured via an RCP temperature measurement bypass. Each loop's temperature measurement bypass is equipped with several RCP loop temperature measuring instruments, including RCP loop protection channel temperature measuring instruments and RCP loop control channel temperature measuring instruments. The protection average temperature refers to the arithmetic mean of the hot and cold segment temperatures of the corresponding loop as measured by the RCP loop protection channel temperature measuring instruments. In other words, the protection average temperature of loop one is the arithmetic mean of the hot and cold segment temperatures of loop one as measured by the RCP loop protection channel temperature measuring instruments installed on the loop temperature measurement bypass. The protection average temperature of loop two is the arithmetic mean of the hot and cold segment temperatures of loop two as measured by the RCP loop protection channel temperature measuring instruments installed on the loop temperature measurement bypass. The three-loop protection average temperature is the arithmetic average of the hot section temperature and the cold section temperature of the three-loop measured by the RCP loop protection channel temperature measuring instrument set on the three-loop temperature measurement bypass. In some embodiments, the RCP loop temperature measuring instrument can be a resistance thermometer.

[0062] S12. Determine whether to generate a protection probe pre-judgment signal based on the actual deviation between the minimum protection average temperature value and the expected temperature value. The expected temperature value is determined based on a curve showing a correspondence between the second-maximum turbine load value and the expected temperature value. It is understood that after determining the second-maximum turbine load value, the expected temperature value can be found in the curve showing a correspondence between the second-maximum turbine load value and the expected temperature value. In some embodiments, after determining the second-maximum turbine load value, a function generator can automatically generate a curve showing a correspondence between the second-maximum turbine load value and the expected temperature value based on the turbine load. Of course, in other optional embodiments, the curve showing a correspondence between the second-maximum turbine load value and the expected temperature value can also be pre-stored in a memory.

[0063] Specifically, this embodiment determines whether the actual deviation between the minimum value of the protection average temperature and the expected temperature value is consistent with the standard deviation. If so, a protection probe prejudgment signal is generated. Among them, the standard deviation is determined based on the standard deviation curve of the expected temperature value changing with the turbine load power. It can be understood that in some embodiments, after determining the second largest value of the turbine load, the function generator can automatically generate the standard deviation curve of the expected temperature value changing with the turbine load power according to the turbine load. Of course, in other optional embodiments, the standard deviation curve of the expected temperature value changing with the turbine load power can also be pre-stored in the memory,

[0064] In some embodiments, the second maximum value of the turbine load can be used to generate two curve results through a function generator. One curve result is a curve showing the corresponding relationship between the second maximum value of the turbine load and the expected temperature value, and the other curve result is a standard deviation curve showing the change of the expected temperature value with the turbine load power. For example, the standard deviation can be 2°C, 3°C, or 10°C.

[0065] S13. Based on the occurrence of the C22 signal and the protection probe prediction signal, the judgment result of whether the C22 signal is true or false is output and displayed.

[0066] In an embodiment of the present invention, only a protection probe prejudgment signal can be set for determining the authenticity of the C22 signal. When the C22 signal appears and a protection probe prejudgment signal is generated, the C22 signal is determined to be a true signal. By setting the protection probe prejudgment signal for determining the authenticity of the C22 signal, this embodiment can automatically determine the credibility of the C22 signal, ensuring that the C22 authenticity determination process is implemented more scientifically and efficiently. It can provide timely and effective support for operating values, effectively avoiding the deterioration of the unit status due to untimely or erroneous intervention, and even the induction of unacceptable risks and consequences.

[0067] In order to further increase the credibility and avoid misjudgment, in the second embodiment of the C22 signal true / false judgment method of the present invention, a temperature trend prediction signal generation logic is added. Figure 2 As shown, the method includes the following steps:

[0068] S11. Determine the second maximum value of the turbine load of the secondary circuit, and respectively determine the protection average temperatures of the primary circuit, the secondary circuit, and the tertiary circuit, and determine the minimum value of the protection average temperature therefrom.

[0069] S12. Determine whether to generate a protection probe prediction signal based on the actual deviation between the minimum protection average temperature and the expected temperature value.

[0070] S21. Determine the control average temperature of the first loop, the second loop, and the third loop, respectively. It will be understood that the control average temperature refers to the arithmetic mean of the hot section temperature and the cold section temperature of the corresponding loop as measured by the RCP loop control channel temperature measuring instrument. In other words, the control average temperature of the first loop is the arithmetic mean of the hot section temperature and the cold section temperature of the first loop as measured by the RCP loop control channel temperature measuring instrument set on the first loop temperature measurement bypass. The control average temperature of the second loop is the arithmetic mean of the hot section temperature and the cold section temperature of the second loop as measured by the RCP loop control channel temperature measuring instrument set on the second loop temperature measurement bypass. The control average temperature of the third loop is the arithmetic mean of the hot section temperature and the cold section temperature of the third loop as measured by the RCP loop control channel temperature measuring instrument set on the third loop temperature measurement bypass.

[0071] S22. There are three criteria:

[0072] Criterion 1: There is no downward drift in the temperature probes controlled by each loop.

[0073] Criterion 2: The deviations between the protection average temperatures of each loop are all less than the absolute value of the preset deviation value.

[0074] Criterion 3: The temperature of each loop drops simultaneously.

[0075] When the above three criteria are met, a temperature trend prediction signal is generated.

[0076] S23. Based on the occurrence of the C22 signal, the protection probe prediction signal, and the temperature trend prediction signal, output and display the judgment result of whether the C22 signal is true or false.

[0077] Specifically, criterion 1 includes:

[0078] Criterion 1-1: The difference between the control average temperature of a loop and the protection average temperature of a loop is greater than a preset deviation value.

[0079] Criterion 1-2: The difference between the control average temperature of the second loop and the protection average temperature of the second loop is greater than the preset deviation value.

[0080] Criteria 1-3: The difference between the control average temperature of the three loops and the protection average temperature of the three loops is greater than the preset deviation value.

[0081] When all the above criteria are met, it is determined that the temperature probes controlled by each loop have no downward drift.

[0082] Specifically, criterion 3 includes:

[0083] Criterion 3-1: The difference between the controlled average temperature of a loop and the desired temperature value is less than the preset deviation value.

[0084] Criterion 3-2: The difference between the protection average temperature of a loop and the expected temperature value is less than the preset deviation value.

[0085] Criterion 3-3: The difference between the controlled average temperature of the second loop and the expected temperature value is less than the preset deviation value.

[0086] Criterion 3-4: The difference between the protection average temperature of the second loop and the expected temperature value is less than the preset deviation value.

[0087] Criterion 3-5: The difference between the controlled average temperature of the three loops and the expected temperature value is less than the preset deviation value.

[0088] Criterion 3-6: The difference between the protection average temperature of the three loops and the expected temperature value is less than the preset deviation value.

[0089] When at least five of the above criteria are met, it is determined that the temperatures of the various loops drop simultaneously.

[0090] Based on the above embodiment, in step S23, it includes:

[0091] If the C22 signal, the protection probe prediction signal and the temperature trend prediction signal all appear, it is judged that the unit is truly cold and the C22 signal is a true signal.

[0092] If the C22 signal and the temperature trend prediction signal appear, and the protection probe prediction signal does not appear, it is judged that the unit is truly cold and the C22 signal is a true signal.

[0093] If the C22 signal and the protection probe prediction signal appear, and the temperature trend prediction signal does not appear, it is judged that the unit is truly cold and the C22 signal is a true signal.

[0094] If the C22 signal appears and the protection probe prediction signal and temperature trend prediction signal do not appear, it is judged that the unit is not really cold and the C22 signal is a false signal.

[0095] This embodiment determines whether to generate a temperature trend prediction signal by comparing the temperature data measured by the temperature measuring instrument. This can further increase the credibility of the C22 signal authenticity judgment result and avoid misjudgment. It can provide timely and effective support for operating values ​​and effectively avoid the deterioration of unit status due to untimely or erroneous intervention, or even the induction of unacceptable risks and consequences.

[0096] Combine Figures 3 to 5 , the following takes the preset deviation value of -1.5℃ as an example to further explain this solution in detail.

[0097] Six resistance thermometers are set on the temperature measurement bypass of each loop, of which three resistance thermometers are used to measure the hot section temperature, and the other three resistance thermometers are used to measure the cold section temperature. For example, for one loop, the hot section thermometer is RCP030 / 031 / 032MT (range 275~345℃), and the cold section thermometer is RCP033 / 034 / 035MT (range 265~335℃). Among them, the RCP030 / 033MT signal is used for the protection channel (that is, RCP030 / 033MT is the RCP loop protection channel temperature measuring instrument). The RCP032 / 035MT signal is used for the control channel (that is, RCP032 / 035MT is the RCP loop control channel temperature measuring instrument). 031 / 034MT is spare.

[0098] Figure 3 The schematic diagram of the C22 signal generation logic architecture in the related art is shown. The embodiment of the present invention is based on the existing C22 logic architecture to construct a protection probe prediction signal. The signal measured by the RCP temperature measurement bypass protection channel temperature measuring instrument is used to adjust the GRE022 / 023 / 024MP according to the second maximum value of the secondary circuit turbine load, and a core subcooling model is built with reference to the current C22 logic, such as Figure 4 This model independently designs a comparison signal circuit (relying on the RCP loop protection channel temperature measurement instrument). This circuit features an independent signal source and independent C22 calculation process, ensuring that the C22 signal authenticity judgment process can be implemented scientifically and efficiently.

[0099] It can be understood that different expected temperature values ​​(RGL404KM) will appear depending on the turbine load. The RCP loop protection channel temperature measuring instrument is used to measure the hot section temperature and cold section temperature of the first loop, second loop, and third loop respectively, and the average value of the sum of the hot section temperature and the cold section temperature of each loop is taken. The average value is compared with the expected temperature value to determine whether the temperature signal based on the protection probe can cause a C22 fault.

[0100] It should be noted that, in some embodiments, Figure 4 As shown, the second largest value can be processed by the function generator GD according to needs. At this time, the output and displayed value will deviate slightly from the value measured by the instrument, but it is still the second largest value. This is normal.

[0101] Figure 5 The following is a schematic diagram of the temperature trend prediction signal generation logic of this embodiment. Specifically, the temperature trend prediction signal detailed logic is as follows:

[0102] 1) Each loop control temperature probe has no under-drift: Take three out of the following three criteria (all three conditions are met) to generate the "each loop control temperature probe has no under-drift" criterion:

[0103] RCP624KM (one loop control average temperature) -RCP611KM (one loop protection average temperature)>-1.5℃;

[0104] RCP626KM (second loop control average temperature) -RCP615KM (second loop protection average temperature) > -1.5°C;

[0105] RCP628KM (three-loop control average temperature) -RCP619KM (three-loop protection average temperature) > -1.5℃.

[0106] It should be noted that the 1.5°C setting is based on the fluctuation error of the field instrument and is not specifically limited in this invention. The fluctuation error setting for the three loops is the same. In the figure, ZO is an adder. ZI is a minimum selector, used to select the minimum value from multiple values.

[0107] 2) Three-loop temperature comparison consistency: When the deviation between RCP611 / 615 / 619KM is less than 1.5℃, the "three-loop temperature comparison consistency" criterion is generated.

[0108] 3) The temperatures of the three loops decrease simultaneously: The following six criteria are used to generate the "temperatures of the three loops decrease simultaneously" criterion through the six-out-of-five logic.

[0109] RCP611KM-RGL404KM<-1.5℃;

[0110] RCP615KM-RGL404KM<-1.5℃;

[0111] RCP619KM-RGL404KM<-1.5℃;

[0112] RCP624KM-RGL404KM<-1.5℃;

[0113] RCP626KM-RGL404KM<-1.5℃;

[0114] RCP628KM-RGL404KM<-1.5℃.

[0115] 4) The “temperature trend prediction signal” is generated by taking three out of the three criteria: “no downward drift of the temperature probes in each loop control”, “the temperature comparison of the three loops is consistent” and “the temperature of the three loops drops at the same time”.

[0116] Based on the presence or absence of the C22 signal, the protection probe prediction signal, and the temperature trend prediction signal, a true or false C22 signal is determined and displayed on the KIC screen. True C22 signals are displayed in green, and false C22 signals are displayed in red. Of course, other markings are also possible, and the present invention is not limited to color markings. The generation logic is as follows:

[0117] 1) The C22 signal appears, the temperature trend prediction signal appears, the protection probe prediction signal appears, and the unit is actually cold, which is judged as a true C22 signal;

[0118] 2) The C22 signal appears, the temperature trend prediction signal appears, but the protection probe prediction signal does not appear. The unit is actually cold, and it is judged as a true C22 signal;

[0119] 3) The C22 signal appears, the temperature trend prediction signal does not appear, the protection probe prediction signal appears, and the unit is actually cold, which is judged as a true C22 signal;

[0120] 4) The C22 signal appears, but the temperature trend prediction signal and the protection probe prediction signal do not appear. The unit is not actually cold and is judged to be a false C22 signal.

[0121] Figure 6 Schematic diagrams of the C22 auxiliary judgment screen of some embodiments are shown. In this embodiment, the judgment result can be displayed through the C22 auxiliary judgment screen. The C22 auxiliary judgment screen is also provided with a start / stop button. The method further includes: when it is necessary to enter the extended operation phase of the unit, receiving the start / stop instruction generated by the user through the start / stop button, and deactivating the C22 auxiliary judgment screen in response to the start / stop instruction. Figure 7 The following is a schematic diagram of the interface for activating the C22 auxiliary judgment screen's activation and deactivation commands. The controls at the top of the screen enable and disable the C22 auxiliary judgment function. Instructions for enabling and disabling the controls are added during program execution, and upon exiting, a red reminder appears: "Please note: The C22 auxiliary judgment screen is not available in the current unit state."

[0122] It can be understood that this method only considers a single fault. Combined with the actual situation of DCS, the fault scenarios are as follows: false C22 signals directly generated by the control MT under-drift or power failure; real C22 signals caused by the control MT over-drifting; real C22 signals caused by control rod under-insertion and incorrect boronization; real C22 signals caused by overcooling of the primary circuit due to a secondary circuit fault; and erroneous C22 signals caused by a card failure in the middle link of the C22 signal circuit.

[0123] If the C22 signal does not appear, the authenticity is not judged. This method is only applicable when GCT-C is not turned on, and the function activation and deactivation are tracked in the startup and shutdown files. In all six stages of extended operation, the slope of RGL401GD needs to be adjusted, so this screen is no longer applicable during extended operation, and it is necessary to exit in advance through the screen activation and deactivation buttons, and upgrade to the relevant program. In other words, the authenticity judgment method of the C22 signal of the present invention is not applicable during extended operation, and it is necessary to exit the C22 auxiliary judgment screen by triggering the activation and deactivation buttons to prevent system malfunction. Due to the problem of data refresh, the C22 signal is triggered instantaneously, and there is a problem of trigger delay in authenticity judgment, and a comprehensive judgment of the authenticity of C22 is required.

[0124] This embodiment uses the C22 auxiliary judgment screen to intuitively display judgment results. Through DCS data collection, calculations, and logical operations, it automatically generates true and false C22 signals based on a truth table. True C22 signals can also be displayed in green, while false C22 signals are displayed in red. This embodiment, through innovative optimization of the human-machine interface, provides timely and effective support for operational values, effectively avoiding deterioration of unit status and even unacceptable risks and consequences caused by untimely or erroneous intervention. The C22 auxiliary judgment screen can be exited by triggering the "Start / Stop" button, thus preventing system malfunctions.

[0125] In some embodiments, a link to the C22 auxiliary judgment screen can be added to nuclear power-related screens. For example, a link to the C22 auxiliary judgment screen can be added to the nuclear power unit DCS system screen to quickly link to the C22 auxiliary judgment screen. A link to the C22 auxiliary judgment screen can also be added to the alarm card to quickly link to the C22 auxiliary judgment screen. This embodiment facilitates rapid switching between screens, improving user experience and work efficiency.

[0126] In another preferred embodiment, the computer-readable storage medium of this embodiment stores a computer program suitable for loading by a processor to execute the steps of the C22 signal authenticity determination method described in the above embodiment. This embodiment ensures a more scientific and efficient implementation of the C22 authenticity determination process. It can provide timely and effective support for operational values, effectively avoiding deterioration of unit status due to untimely or erroneous intervention, and even the incurrence of unacceptable risks and consequences.

[0127] In another preferred embodiment, the computer device of this embodiment includes a memory and a processor. The memory stores a computer program, and the processor executes the steps of the C22 signal authenticity determination method described in the above embodiment by calling the computer program stored in the memory. This embodiment ensures that the C22 authenticity determination process is implemented more scientifically and efficiently. It can provide timely and effective support for operational values, effectively avoiding the deterioration of unit status due to untimely or erroneous intervention, or even the induction of unacceptable risks and consequences.

[0128] The computer-readable storage medium of the present invention can be any computer-readable storage medium that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk.

[0129] The processor of the present invention is used to provide computing and control capabilities to support the operation of the entire device. It should be understood that in the embodiments of the present application, the processor can be a central processing unit (CPU), and the processor can also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0130] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0131] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0132] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A method for determining the authenticity of a C22 signal, wherein the C22 signal is a low average temperature signal of a circuit, characterized in that: The following steps are involved: S11. Determine the second maximum value of the turbine load of the secondary circuit, and respectively determine the average protection temperatures of the primary, secondary, and tertiary circuits, and determine the minimum value of the average protection temperatures therefrom; S12, judging whether to generate a protection probe pre-judgment signal according to the actual deviation between the minimum protection average temperature value and the expected temperature value; Wherein, the expected temperature value is determined according to a curve of correspondence between the second largest value of the steam turbine load and the expected temperature value; S13. According to the C22 signal and the occurrence of the protection probe prediction signal, the judgment result of whether the C22 signal is true or false is output and displayed.

2. The method for determining the authenticity of a C22 signal according to claim 1, wherein: Step S12 includes: Determine whether the actual deviation between the minimum protection average temperature value and the expected temperature value is consistent with the standard deviation; If so, a protection probe prediction signal is generated; The standard deviation is determined according to a standard deviation curve of the expected temperature value changing with turbine load power.

3. The method for determining the authenticity of a C22 signal according to claim 1 or 2, wherein: The method further includes: S21, respectively determining the control average temperature of the first loop, the second loop, and the third loop; S22. There are three criteria: Criterion 1: The temperature probes of each loop control circuit do not drift downward; Criterion 2: The deviation between the protection average temperatures of each loop is less than the absolute value of the preset deviation value; Criterion 3: The temperature of each loop drops simultaneously; When the above three criteria are met, a temperature trend prediction signal is generated; Step S13 includes: According to the occurrence of the C22 signal, the protection probe prediction signal and the temperature trend prediction signal, the judgment result of whether the C22 signal is true or false is output and displayed.

4. The method for determining the authenticity of a C22 signal according to claim 3, wherein: The criterion 1 includes: Criterion 1-1: The difference between the control average temperature of a loop and the protection average temperature of a loop is greater than the preset deviation value; Criteria 1-2: The difference between the control average temperature of the second loop and the protection average temperature of the second loop is greater than the preset deviation value; Criteria 1-3: The difference between the control average temperature of the three loops and the protection average temperature of the three loops is greater than the preset deviation value; When all the above criteria are met, it is determined that the temperature probes controlled by each loop have no downward drift.

5. The method for determining the authenticity of a C22 signal according to claim 3, wherein: The criterion 3 includes: Criterion 3-1: The difference between the control average temperature of a loop and the expected temperature value is less than the preset deviation value; Criterion 3-2: The difference between the protection average temperature of a loop and the expected temperature value is less than the preset deviation value; Criterion 3-3: The difference between the controlled average temperature of the second loop and the expected temperature value is less than the preset deviation value; Criterion 3-4: The difference between the protection average temperature of the second loop and the expected temperature value is less than the preset deviation value; Criterion 3-5: The difference between the controlled average temperature of the three loops and the expected temperature value is less than the preset deviation value; Criterion 3-6: The difference between the three-loop protection average temperature and the expected temperature value is less than the preset deviation value; When at least five of the above criteria are met, it is determined that the temperatures of the various loops drop simultaneously.

6. The method for determining the authenticity of a C22 signal according to claim 3, wherein: In step S13, it includes: If the C22 signal, the protection probe prediction signal, and the temperature trend prediction signal all appear, it is determined that the unit is truly cold and the C22 signal is a true signal; If the C22 signal and the temperature trend prediction signal appear, and the protection probe prediction signal does not appear, it is determined that the unit is truly cold and the C22 signal is a true signal; If the C22 signal and the protection probe prediction signal appear, and the temperature trend prediction signal does not appear, it is determined that the unit is truly cold and the C22 signal is a true signal; If the C22 signal appears and the protection probe prediction signal and the temperature trend prediction signal do not appear, it is determined that the unit is truly not cold and the C22 signal is a false signal.

7. The method for determining the authenticity of a C22 signal according to claim 3, wherein: The protection average temperature is the arithmetic mean of the hot segment temperature and the cold segment temperature of the corresponding loop measured by the temperature measuring instrument of the RCP loop protection channel; and / or the control average temperature is the arithmetic mean of the hot segment temperature and the cold segment temperature of the corresponding loop measured by the temperature measuring instrument of the RCP loop control channel.

8. The method for determining the authenticity of a C22 signal according to claim 1, wherein: The judgment result is displayed on a C22 auxiliary judgment screen; the C22 auxiliary judgment screen is also provided with a withdrawal button, and the method further includes: When it is necessary to enter the extended operation phase of the unit, the user receives the start / stop instruction generated by triggering the start / stop button, and in response to the start / stop instruction, the C22 auxiliary judgment screen is deactivated.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the steps of the method for determining the authenticity of a C22 signal according to any one of claims 1 to 8.

10. A computer device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the C22 signal authenticity judgment method according to any one of claims 1 to 8 by calling the computer program stored in the memory.

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