A calculation method and device for the operation mode of a nuclear power unit

Abstract

The present invention discloses a method and device for calculating the operation mode of a nuclear power unit. The method includes the following steps: Step S1, select corresponding measuring points for each operation mode of the nuclear power unit, and configure a corresponding logical judgment formula for each operation model based on the measuring points; Step S2, obtain the real-time values of each measuring point of the nuclear power unit, and calculate the logical calculation value of the logical judgment formula based on the real-time values; Step S3, obtain the operation state calculation result of the nuclear power unit according to the logical calculation value of the logical judgment formula; Step S4, obtain the real operation state of the nuclear power unit, compare the real operation state with the operation state calculation result, and modify the logical judgment formula based on the comparison result. The present invention can accurately monitor the whole process of the operation of the nuclear power unit in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power operation safety, and particularly to a method and device for calculating the operation mode of a nuclear power unit. Background Art

[0002] A nuclear power unit is a basic power generation unit composed of a reactor and its supporting steam turbine generator set, as well as systems and facilities required to maintain their normal operation and ensure safety. There are various operation modes for the operation of a nuclear power unit, and the measurement points to be monitored are different under different operation modes. Therefore, it is necessary to perform corresponding monitoring for different operation modes of the nuclear power unit, promptly detect abnormal situations of the nuclear power unit and give an alarm to ensure the operation safety of the nuclear power unit and the safety of the staff. At present, the monitoring of the operation state of the nuclear power unit is mainly completed by the DCS system. The monitoring and alarm of the DCS system are only for the monitoring during grid-connected power generation operation and cannot complete effective monitoring under different operation modes during the entire operation process. Especially when the nuclear power unit is shut down, the alarm signal of the DCS system is usually shielded, resulting in the inability of the personnel outside the nuclear power plant to promptly know the real-time situation of the nuclear power unit, causing inconvenience and potential hazards to the operation and maintenance of the nuclear power unit. Summary of the Invention

[0003] In view of this, it is necessary to provide a method and device for calculating the operation mode of a nuclear power unit to effectively solve the problem of incomplete and untimely monitoring of the operation state of the nuclear power unit.

[0004] The present invention provides a method for calculating the operation mode of a nuclear power unit, including the following steps:

[0005] Step S1: Select corresponding measurement points for each operation mode of the nuclear power unit, and configure a corresponding logical judgment formula for each operation model based on the measurement points;

[0006] Step S2: Obtain the real-time values of each measurement point of the nuclear power unit, and calculate the logical calculation value of the logical judgment formula based on the real-time values;

[0007] Step S3: Obtain the operation state calculation result of the nuclear power unit according to the logical calculation value of the logical judgment formula;

[0008] Step S4: Obtain the real operation state of the nuclear power unit, compare the real operation state with the operation state calculation result, and modify the logical judgment formula based on the comparison result.

[0009] Preferably, the specific content of step S1 is as follows:

[0010] Set multiple judgment conditions for each operation mode of the nuclear power unit. Each judgment condition includes a comparison value and a judgment condition of the measurement point. Perform logical operations based on the multiple judgment conditions to obtain the logical judgment formula of the corresponding operation model.

[0011] Preferably, step S2 is specifically as follows:

[0012] Obtain the real-time values of each measuring point of the nuclear power unit from the DCS system, substitute the real-time values into the logical judgment formula, and obtain the logical calculation value of the logical judgment formula.

[0013] Preferably, step S3 is specifically as follows:

[0014] Only one of the logical calculation values of the logical judgment formulas under each operating mode is equal to "Yes", and the calculation result of the operating state of the nuclear power unit is the operating model corresponding to the logical judgment formula whose logical calculation value is equal to "Yes".

[0015] Preferably, step S3 further includes:

[0016] If the number of logical calculation values of the logical judgment formulas under each operating mode that are equal to "Yes" is not one, it means that the configuration of the logical judgment formula is incorrect, and the logical judgment formula needs to be modified.

[0017] Preferably, step S4 is specifically as follows:

[0018] Obtain the real operating state of the nuclear power unit based on the daily inspection report of the unit. If the calculation result of the operating state is different from the real operating state, an alarm for configuration error will be issued, and the threshold and conditions of the logical judgment formula will be modified, and the operating state of the nuclear power unit will be recalculated based on the modified logical judgment formula.

[0019] Preferably, it further includes:

[0020] After the nuclear power unit undergoes a major overhaul, optimize the logical judgment formulas under each operating mode based on the operating state in the daily report of the major overhaul.

[0021] Preferably, it further includes:

[0022] Share the calculation result of the operating state to the staff related to the nuclear power unit. Before performing nuclear power operations, judge the safety state of the current operation based on the calculation result of the operating state.

[0023] The present invention also provides a nuclear power unit operating mode calculation device, including a memory and a processor. A computer program is stored on the memory, and when the computer program is executed by the processor, the nuclear power unit operating mode calculation method is implemented.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: For each operation mode of the nuclear power unit, the present invention configures a corresponding logical judgment formula, and judges the real-time operation state of the nuclear power unit based on the real-time values of the measurement points, realizing the whole-process real-time monitoring of the nuclear power unit and ensuring the safe operation of the nuclear power unit throughout the whole process. At the same time, the calculation result of the operation state based on the logical judgment formula is compared with the actual operation state, and the logical judgment formula is modified based on the comparison result, so as to continuously optimize the logical judgment formula and improve its calculation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] FIG. 1 is a flowchart of an embodiment of a method for calculating the operation mode of a nuclear power unit provided by the present invention;

[0027] Figure 2 is Figure 1 FIG. is a configuration diagram of an embodiment of the configuration of the logical judgment formula for different operation modes of the No. 1 nuclear power unit in the illustrated embodiment;

[0028] Figure 3a is Figure 1 FIG. is a configuration diagram of an embodiment of the configuration of the logical judgment formula for different operation modes of the No. 5 nuclear power unit in the illustrated embodiment;

[0029] Figure 3b is Figure 1 FIG. is a configuration diagram of an embodiment of the configuration of the logical judgment formula for the No. 1 nuclear power unit in the reactor power operation mode in the illustrated embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The preferred embodiments of the present invention will be specifically described below with reference to the drawings. The drawings constitute a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, and are not used to limit the scope of the present invention.

[0031] Example 1, please refer to Figure 1 , a method for calculating the operation mode of a nuclear power unit in this embodiment specifically includes the following steps:

[0032] Step S1: Select corresponding measurement points for each operation mode of the nuclear power unit, and configure a corresponding logical judgment formula for each operation model based on the measurement points;

[0033] Step S2: Obtain the real-time values of each measurement point of the nuclear power unit, and calculate the logical calculation value of the logical judgment formula based on the real-time values;

[0034] Step S3: Obtain the calculation result of the operating state of the nuclear power unit according to the logical calculation value of the logical judgment formula;

[0035] Step S4: Obtain the actual operating state of the nuclear power unit, compare the actual operating state with the calculation result of the operating state, and modify the logical judgment formula based on the comparison result.

[0036] In this embodiment, for the calculation of the real-time operation mode of the nuclear power unit, a method for visual configuration of the calculation logic is proposed, and the experience of nuclear power operation personnel is used to continuously optimize the model and improve the accuracy of the model. Specifically, for the judgment logic of different operation modes, power plant measurement points are selected, then judgment conditions and comparison thresholds are selected to generate a logical judgment formula. Then, through the real-time value, it can be calculated whether the result of the current judgment condition is "yes" or "no". The calculation logic of each state is combined and judged by multiple judgment conditions, and the conditions can be combined with "AND", "OR" and parentheses. The logical calculation value of the logical judgment formula is obtained after the combined judgment of each judgment condition of each operation mode. The operation mode with the logical calculation value of "yes" is the calculation result of the operating state. Finally, the staff regularly check the calculation result of the operating state. If it does not match the actual operating state, the logical judgment formula is modified, and the experience of nuclear power operation staff is used to continuously optimize the model and improve the accuracy of the model.

[0037] In this embodiment, a corresponding logical judgment formula is configured for each operation mode of the nuclear power unit, and the real-time operation state of the nuclear power unit is judged based on the real-time value of the measurement point, so as to realize the whole-process real-time monitoring of the nuclear power unit and ensure the safe operation of the whole process of the nuclear power unit. At the same time, the calculation result of the operating state based on the logical judgment formula is compared with the actual operating state, and the logical judgment formula is modified based on the comparison result, so as to continuously optimize the logical judgment formula and improve its prediction accuracy.

[0038] Further, the specific content of step S1 is as follows:

[0039] Set multiple judgment conditions for each operation mode of the nuclear power unit. Each judgment condition includes the comparison value of the measurement point and the judgment condition. Based on the multiple judgment conditions, logical operations are performed to obtain the logical judgment formula of the corresponding operation model.

[0040] Specifically, there are a total of 8 nuclear power units in this embodiment. Taking the No. 1 nuclear power unit and the No. 5 nuclear power unit as examples for illustration. As Figure 2 shown, the No. 1 nuclear power unit includes eight operation modes: power operation, minimum monitorable power, hot state, normal cold shutdown, maintenance cold shutdown, refueling cold shutdown, heating, and cooling. As Figure 3aAs shown in the figure, the No. 5 nuclear power unit includes six operation modes: reactor power operation mode, SG cooling shutdown condition, RRA cooling shutdown mode, maintenance shutdown mode, refueling cold shutdown mode, and complete refueling cold shutdown mode.

[0041] There are 6 units in this embodiment. The measuring points of each unit are different and are within a certain range. The measuring point range of Unit 1 is shown in the following table.

[0042] Table 1

[0043] Measuring point Measuring point code Primary circuit temperature JEC00FT601XP04 Primary circuit pressure JAA10CP911XQ01 Condenser vacuum MAG10CP001XQ01 Secondary circuit pressure LBA00CP911XQ01 Electrical power MKA10CE911XQ01 Nuclear power JKT00FJ901UXQ01 Primary circuit liquid level JEF10CL911XQ01 Total flow rate of feed water in steam generator LAB00FF902XQ01 Steam turbine speed MAX51CS901XQ01 Total condensate flow rate LCA20CF901XQ01 Neutron power JKT00FX801XXQ02 Steam generator liquid level JEA10CL913XQ01 Primary circuit liquid level JEF10CL913XQ01 Deaerator liquid level LAA10CL901XQ01 JNB liquid level JNB10CL003XQ01 Boron concentration of residual heat removal in the second channel JMN20CQ001XQ01 Residual heat removal flow rate in the first channel JNG11CF911XQ01 Residual heat removal flow rate in the fourth channel JNG41CF911XQ01 Primary circuit temperature JEC00FT601XP01 Residual heat removal flow rate in the second channel JNG21CF911XQ01 Boron concentration of residual heat removal in the first channel JMN10CQ001XQ01 Boron concentration of residual heat removal in the third channel JMN1CQ001XQ01 Boron concentration of residual heat removal in the fourth channel JMN40CQ001XQ01 Residual heat removal flow rate in the third channel JNG31CF911XQ01 Primary circuit liquid level JEF10CL004XQ01 Spent fuel pool temperature FAK40CT901XQ01 Fuel pool liquid level FAK10CL901XQ01 KBB12BB001 liquid level KBB12CL901XQ01 JNK10BB001 liquid level JNK40CL811XQ01 KBB11BB001 liquid level KBB11CL901XQ01 JNK10BB001 liquid level JNK10CL811XQ01 Boron concentration of spent fuel pool of FAK10 FAK10CQ001XQ01 KBC12BB001 liquid level KBC12CL901XQ01 Boron concentration of spent fuel pool of FAK40 FAK40CQ001XQ01 KBC11BB001 liquid level KBC11CL901XQ01 Saturation temperature difference between primary and secondary circuits JAA00FT901ZQ01 Heating / cooling rate of primary circuit JEC00FT601XP21

[0044] After the measuring points are selected, it is necessary to set the logical judgment formula for a certain operation mode of a certain nuclear power unit and click the "Edit" button to edit. As Figure 3b shown in the figure, edit the power plant measuring points on the editing interface, and then select the judgment conditions and comparison thresholds to generate a logical judgment formula.

[0045] Furthermore, the specific step S2 is as follows:

[0046] Obtain the real-time values of each measuring point of the nuclear power unit from the DCS system, and substitute the real-time values into the logical judgment formula to obtain the logical calculation value of the logical judgment formula.

[0047] As Figure 3b shown in the figure, the system automatically obtains the real-time values of each measuring point from the DCS system, and then substitutes the real-time values into the logical judgment formula. For example, in the reactor power operation mode, for the first judgment condition, the real-time value 99.105 is greater than the threshold 0.2, so the first judgment condition is "Yes"; for the second judgment condition, the real-time value 324.935 is greater than 291.4, so the second judgment condition is "Yes". The judgment values of the two judgment conditions are subjected to a logical AND operation, and the final calculation result of the logical judgment formula is "Yes".

[0048] Furthermore, the specific step S3 is as follows:

[0049] Only one of the logical calculation values of the logical judgment formulas under each operation mode is equal to "Yes", and the operation state calculation result of the nuclear power unit is the operation model corresponding to the logical judgment formula whose logical calculation value is equal to "Yes".

[0050] As Figure 3b shown in the figure, among the calculation results of the logical judgment formulas of all operation modes, only the calculation result of the "reactor power operation mode" is "Yes", so the operation state calculation result is the "reactor power operation mode".

[0051] Furthermore, the step S3 further includes:

[0052] If the number of logical calculation values of the logical judgment formulas in each operating mode that are equal to "yes" is not one, the logical judgment formulas are misconfigured, and the logical judgment formulas need to be modified.

[0053] For the same unit, only one calculation result is "yes" for all operating modes. If there are multiple, it means there is a problem with the calculation logic of a certain unit's operating mode, and engineers need to modify the calculation logic based on experience. After modifying the logic, click "Apply" to update the calculation logic, and utilize the experience of nuclear power operation staff to continuously optimize the model and improve the accuracy of the model.

[0054] Further, the specific steps of step S4 are as follows:

[0055] Based on the daily report of unit inspection, obtain the actual operating status of the nuclear power unit. If the calculation result of the operating status is different from the actual operating status, an incorrect configuration alarm is given, and the thresholds and conditions of the logical judgment formulas are modified. Based on the modified logical judgment formulas, continue to calculate the operating status of the nuclear power unit.

[0056] On-site staff fill in the daily report after judging the actual operating status of the unit every day. If the actual operating status is different from the operating status calculated by the model, an alarm is given to warn the staff that the currently calculated operating status is abnormal and the logical judgment formula needs to be modified.

[0057] Further, it also includes:

[0058] During the major overhaul of the nuclear power unit, compare the operating status summarized in the daily report of the major overhaul with the result of the real-time calculated operating status of the unit. If there is a difference, consider the time difference between the daily report statistics and the regular meeting comparison, and comprehensively consider the current situation to judge the normal operating status of the unit to determine whether to optimize the configured logical judgment formula to improve the accuracy of the calculation result of the unit's operating status.

[0059] Based on the calculation logic of the unit's operating status optimized for the current unit's major overhaul, it will be applied to the next major overhaul of the current unit. Through continuous optimization of multiple major overhauls, the result of the actual operating status of the major overhaul obtained by real-time data calculation will become more and more accurate.

[0060] Further, it also includes:

[0061] Share the calculation result of the operating status to the staff related to the nuclear power unit. Before performing nuclear power operations, judge the safety status of the current operation based on the calculation result of the operating status.

[0062] Share the calculation result of the operating status of the model so that relevant staff can share the operating status of the nuclear power unit in real time, ensuring the safety of the unit operation and the safety of nuclear power staff.

[0063] Embodiment 2. This embodiment provides a calculation device for the operating mode of a nuclear power unit, including a memory and a processor. A computer program is stored on the memory, and when the computer program is executed by the processor, the calculation method for the operating mode of the nuclear power unit described in Embodiment 1 is implemented.

[0064] The calculation device for the operating mode of the nuclear power unit provided in this embodiment is used to implement the calculation method for the operating mode of the nuclear power unit. Therefore, the technical effects possessed by the calculation method for the operating mode of the nuclear power unit are also possessed by the calculation device for the operating mode of the nuclear power unit, and will not be elaborated here.

[0065] As described above, only the specific preferred embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the present invention.

Claims

1. A method for calculating the operation mode of a nuclear power unit, characterized in that: The following steps are involved: Step S1: When a nuclear power unit is undergoing overhaul, a corresponding measuring point is selected for each operation mode of the nuclear power unit, and a corresponding logical judgment formula of each operation model is configured based on the visual configuration of the measuring point; Step S2, obtaining the real-time value of each measuring point of the nuclear power unit, and calculating the logical calculation value of the logical judgment formula based on the real-time value; Step S3, obtaining a calculation result of the operating state of the nuclear power unit according to the logical calculation value of the logical judgment formula; Step S4, obtaining the actual operating state of the nuclear power unit, comparing the actual operating state with the operating state calculation result, and modifying the logic judgment formula based on the comparison result; The step S1 is specifically as follows: Multiple judgment conditions are set in each operation mode of the nuclear power unit, each judgment condition includes a comparison value of a measuring point and a judgment condition, and logical operations are performed based on the multiple judgment conditions to obtain a logical judgment formula of a corresponding operation model; The step S2 is specifically as follows: Acquire the real-time value of each measuring point of the nuclear power unit from the DCS system, substitute the real-time value into the logic judgment formula, and obtain the logic calculation value of the logic judgment formula; The step S4 is specifically as follows: Based on the daily inspection report of the unit, the actual operating status of the nuclear power unit is obtained. If the calculated operating status result is different from the actual operating status, a configuration error alarm is issued, and the threshold value and condition of the logic judgment formula are modified, and the operating status of the nuclear power unit is continued to be calculated based on the modified logic judgment formula; Also includes: During the overhaul of nuclear power units, the logical judgment formulas under each operating mode are optimized based on the operating status of the daily report of the overhaul; The unit operating status calculation logic optimized based on the current unit overhaul will be applied to the next overhaul of the current unit.

2. The method for calculating the operation mode of a nuclear power unit according to claim 1, characterized in that: The step S3 is specifically as follows: There is only one logical calculation value of the logical judgment formula in each operation mode that is equal to "yes", and the operation state calculation result of the nuclear power unit is the operation model corresponding to the logical judgment formula whose logical calculation value is equal to "yes".

3. The method for calculating the operation mode of a nuclear power unit according to claim 1, characterized in that: The step S3 further comprises: If the number of logical calculation values ​​of the logical judgment formula in each operating mode that is equal to "yes" is not the same, the logical judgment formula configuration is incorrect and the logical judgment formula should be modified.

4. The method for calculating the operation mode of a nuclear power unit according to claim 1, characterized in that: Also includes: The operation status calculation result is shared with the staff related to the nuclear power unit, and before performing nuclear power operations, the safety status of the current operation is judged based on the operation status calculation result.

5. A nuclear power unit operation mode calculation device, characterized in that: It comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, a method for calculating the operation mode of a nuclear power unit as claimed in any one of claims 1 to 4 is implemented.

Images