Multi-cooling switching risk-avoiding control method for nuclear power speed reducer

Abstract

The invention discloses a nuclear power speed reducer multi-cooling switching risk-avoiding control method, which relates to the technical field of nuclear power speed reducers, and comprises the following steps: S1, monitoring a pressure value, a differential pressure value and an oil temperature value of a main cooling system of a nuclear power speed reducer in real time by using a sensor, collecting monitoring data and transmitting the monitoring data to an analysis system; and S2, analyzing the monitoring data by using a Z-score method so as to identify potential risks, and the like. The state data of the main cooling system of the nuclear power speed reducer are monitored in real time through the sensor, the monitored data are analyzed through a Z-core method, potential risks are recognized, an alarm is given, the deviation degree of data points and a mean value is calculated, and abnormal data points are recognized for anomaly detection. The monitoring data is analyzed and the alarm is given, so that operation and maintenance personnel can be helped to find system abnormity in time, measures are taken in time to select the alternative cooling system capable of providing enough cooling capacity for switching, continuous operation of the system is ensured, and the shutdown risk caused by a single fault of the system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power reducers, and in particular to a multi-cooling switching risk avoidance control method for a nuclear power reducer. Background Art

[0002] In a nuclear power plant, a nuclear power reducer is a key device used to regulate the nuclear rate and heat in a nuclear reactor. When a nuclear power reducer fails or requires maintenance, a multi-cooling switching hedging control method is usually adopted to ensure the safe operation of the nuclear power plant.

[0003] At present, the existing nuclear power reducers involve the switching and access of different cooling systems during the multi-cooling switching process. During the switching process, it is difficult to conduct a comprehensive safety analysis and risk assessment of different backup cooling systems, which makes it easy for compatibility issues to exist between the various systems, affecting the smooth switching of the cooling system, and then causing equipment incompatibility and leading to failures or accidents. Summary of the invention

[0004] The object of the present invention is to provide a multi-cooling switching risk avoidance control method for a nuclear power reducer, so as to solve the problem raised in the above background technology that it is difficult to conduct a comprehensive safety analysis and risk assessment of different backup cooling systems during the switching process, which makes it easy for compatibility problems to exist between the various systems, affecting the smooth switching of the cooling system, and further causing equipment incompatibility and leading to failures or accidents.

[0005] To achieve the above object, the present invention provides the following technical solution: a nuclear power reducer multi-cooling switching risk avoidance control method, comprising the following steps: S1. Use sensors to monitor the pressure value, differential pressure value and oil temperature value of the main cooling system of the nuclear power reducer in real time, collect monitoring data and transmit it to the analysis system; S2. Analyze monitoring data using the Z-score method to identify potential risks, determine the severity of the risk and the potential consequences of not taking action, and issue an alert; S3. Evaluate the risks and select an alternative cooling system that can provide sufficient cooling capacity to maintain safe operating conditions; S4, check the alternative cooling system, and after normal operation, execute the automatic switching system for risk avoidance control, and switch the main cooling system to the alternative cooling system; S5. After the system is switched, the operating conditions of the alternative cooling system shall be continuously monitored to ensure that it operates as expected; S6. At the same time, an alarm signal is issued to notify the operator to deal with the fault, and to perform maintenance on the original system and test or inspect the main cooling system of the nuclear power reducer. After the main cooling system is normal, it is put back online and switched back to normal operation.

[0006] Preferably, in step S1, the sensor includes an electronic pressure transmitter, an electronic differential pressure transmitter and an electronic temperature transmitter; the electronic pressure transmitter is used to monitor the pressure of the circulating oil in the cooling system; the electronic differential pressure transmitter is used to monitor the pressure difference on both sides of the filter to determine whether the filter element is blocked; the electronic temperature transmitter is used to monitor the temperature value of the oil outlet of the cooling system. By real-time monitoring of system data, the operating status of the main cooling system of the nuclear power reducer can be timely grasped, which helps to prevent potential problems.

[0007] Preferably, in step S1, the collecting monitoring data and transmitting it to the detection system comprises the following steps: S11, using a pressure transmitter, a differential pressure transmitter and a temperature transmitter to respectively collect the pressure value, the differential pressure value and the oil temperature value of the lubricating oil cooling system in real time; S12, convert the measured value into an electrical signal, and output a 4-20mA current signal to the isolation transmitter; S13, the isolation transmitter outputs the corresponding 4-20mA current signal to the paperless recorder, which converts the received current signal into the actual measurement value for display, recording and output through configuration settings.

[0008] Preferably, in step S2, analyzing the monitoring data using the Z-score method to identify potential risks includes the following steps: S21. Calculate the degree of deviation between the data points in the data set and the mean. The Z-score calculation formula is as follows: ; Among them, Z is the deviation degree value, X is the value of the data point, is the mean of the data set, is the standard deviation of the data set; S22. The calculated value can represent the degree of deviation between the data point and the mean. The Z-score value whose absolute value is greater than the set threshold is considered to be an outlier. S23. Identify abnormal data points and perform abnormal detection on the monitoring data of the reducer cooling system. By analyzing the monitoring data and issuing alarms, operation and maintenance personnel can promptly detect system abnormalities and take timely measures to deal with them, thus avoiding fault escalation.

[0009] Preferably, in step S3, the alternative cooling system includes an air cooling system, a liquid cooling system and an external heat dissipation cooling system, and the air cooling system, the liquid cooling system and the external heat dissipation cooling system are connected in parallel or in series to increase cooling capacity and redundancy, and improve system reliability and safety; Water cooling system: uses water for cooling, absorbing and dissipating heat through a water cooler or water circulation system; Air cooling system: using fans or cooling towers to cool down the equipment through convection heat dissipation; External heat dissipation cooling system: refrigerant or other cooling medium is circulated outside the nuclear power reducer to dissipate heat through a heat exchanger.

[0010] Preferably, in step S3, the risk assessment includes the following steps: S31. Identify risks: Identify all possible risk events, causes and impacts of nuclear power reducers through professional team or expert consultation; S32. Evaluate risk probability: Use the dynamic Bayesian network model to evaluate the probability of each risk event occurring; The dynamic Bayesian network expands the static BN by adding a time dimension. It consists of static BNs on different time slices, and its probability distribution of transition probability is , the formula is as follows: ; Where: is the i-th node at the t-th time, for The parent collection of By using the established dynamic Bayesian network model to evaluate and predict the probability of risk events, various risk events can be quantitatively evaluated according to different conditions and scenarios; S33. Evaluate the impact of each risk event, and determine the level of each risk by combining the probability and impact assessment results. Risk assessment can help decision makers understand the extent of potential risks more clearly, select corresponding alternative cooling systems in a targeted manner, reduce the possibility of failure, and select alternative cooling systems that can provide sufficient cooling capacity to maintain safe operating conditions, which can effectively reduce the risks in nuclear power plant operation and ensure the safe and efficient operation of the system. When selecting an alternative cooling system based on risk assessment, the following factors need to be considered: Cooling capacity: The alternative cooling system must be able to provide sufficient cooling capacity to meet the heat dissipation requirements generated by the reducer during operation; Adaptability: The alternative cooling system needs to be compatible with the original reducer cooling system, taking into account the compatibility of connection, operation, control, etc. to ensure a smooth transition and normal operation; Reliability: When selecting an alternative cooling system, its reliability and stability need to be considered; Ease of maintenance: Choosing a system that is easy to maintain and use can reduce maintenance costs and downtime; Efficiency and energy consumption: Considering the energy consumption of the alternative system, choose a system that can provide efficient cooling and has energy-saving characteristics to reduce operating costs and environmental impact.

[0011] Preferably, in step S4, switching the main cooling system to the alternative cooling system comprises the following steps: S41. Before switching, firstly, conduct a comprehensive inspection of the alternative cooling system to check whether the cooling medium, circulation system, and heat dissipation equipment are normal; S42, starting the automatic switching system according to the set automatic switching program, and switching the main cooling system to the alternative cooling system; S43. During the switching process, closely monitor various key parameters, and after the switching is completed, verify and test the system; S44. After the switching is completed, the key data and operation records in the switching process are synchronously recorded and reported.

[0012] Preferably, in step S5, continuously monitoring the operating conditions of the alternative cooling system comprises the following steps: S51. Obtain the operation status of the alternative cooling system in real time through sensors to understand the changes in various system parameters; S52, record monitoring data and establish historical data records; S53. Regularly inspect the alternative cooling system and check the status of each part of the system; S54. Establish an emergency response mechanism to respond quickly and take emergency measures when abnormal situations occur in the alternative cooling system.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by using sensors to monitor the status data of the nuclear power reducer main cooling system in real time, using the Z-core method to analyze the monitoring data, identifying potential risks and issuing alarms, calculating the degree of deviation between the data point and the mean, identifying abnormal data points for abnormality detection, analyzing the monitoring data and issuing alarms can help operation and maintenance personnel to promptly discover system abnormalities, take timely measures to select an alternative cooling system that can provide sufficient cooling capacity for switching, ensure the continuous operation of the system, and reduce the risk of system downtime caused by a single fault.

[0014] 2. In the present invention, by checking the alternative cooling system, executing the automatic switching system for risk avoidance control, the main cooling system is switched to the alternative cooling system, and the operating conditions of the alternative cooling system are continuously monitored after the switching, the operating status of the alternative cooling system is continuously monitored, regular inspections are conducted, monitoring data is recorded, and an emergency response mechanism is established. System switching and continuous monitoring ensure the normal operation of the alternative cooling system and guarantee the continuity and stability of the system.

[0015] 3. In the present invention, a multi-cooling switching method is used to ensure that the system can quickly switch to the backup cooling system when a fault occurs, which effectively reduces the risk in system operation and ensures the safe operation of the nuclear power reducer. The timely alarm and emergency response mechanism can respond quickly when an abnormal situation occurs in the system, reduce the impact of the fault, and ensure the rapid recovery of the system. It can help the system respond to faults quickly, reduce system downtime, improve the system's resilience, and reduce the impact of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flow chart of a nuclear power reducer multi-cooling switching risk avoidance control method. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 The present invention provides a technical solution: a multi-cooling switching risk avoidance control method for a nuclear power reducer, comprising the following steps: Step 1: Use sensors to monitor the pressure value, differential pressure value and oil temperature value of the nuclear power reducer main cooling system in real time, collect monitoring data and transmit it to the analysis system. Through real-time monitoring of system data, the operating status of the nuclear power reducer main cooling system can be timely understood, which helps to prevent potential problems; Among them, the sensors include electronic pressure transmitter, electronic differential pressure transmitter and electronic temperature transmitter; the electronic pressure transmitter is used to monitor the pressure of the circulating oil in the cooling system; the electronic differential pressure transmitter is used to monitor the pressure difference on both sides of the filter to determine whether the filter element is blocked; the electronic temperature transmitter is used to monitor the temperature value of the oil outlet of the cooling system; The collection and transmission of monitoring data to the detection system includes the following steps: 11) Use pressure transmitter, differential pressure transmitter and temperature transmitter to collect the pressure value, differential pressure value and oil temperature value of the lubricating oil cooling system in real time; 12) Convert the measured value into an electrical signal and output a 4-20mA current signal to the isolation transmitter; 13) The isolation transmitter outputs the corresponding 4-20mA current signal to the paperless recorder. The device converts the received current signal into the actual measurement value for display, recording and output through configuration settings.

[0019] Step 2: Use the Z-core method to analyze monitoring data to identify potential risks, determine the severity of the risks and the potential consequences of not taking action, and issue an alarm. Analyzing monitoring data and issuing an alarm can help operation and maintenance personnel to promptly detect system anomalies and take timely measures to deal with them, thus avoiding fault escalation. Among them, using the Z-core method to analyze monitoring data to identify potential risks includes the following steps: 21) Calculate the degree of deviation between the data points in the data set and the mean. The Z-core calculation formula is as follows: ; Among them, Z is the deviation degree value, X is the value of the data point, is the mean of the data set, is the standard deviation of the data set; 22) The calculated value can represent the degree of deviation between the data point and the mean, and the Z-core value whose absolute value is greater than the set threshold is considered to be an outlier; 23) Identify abnormal data points and perform anomaly detection on the monitoring data of the reducer cooling system.

[0020] Step 3: Assess the risks and select an alternative cooling system that can provide sufficient cooling capacity to maintain safe operating conditions. Risk assessment can help decision makers understand the extent of potential risks more clearly, select appropriate alternative cooling systems in a targeted manner, and reduce the possibility of failures. Selecting an alternative cooling system that can provide sufficient cooling capacity to maintain safe operating conditions can effectively reduce the risks in nuclear power plant operation and ensure the safe and efficient operation of the system. When selecting an alternative cooling system based on a risk assessment, the following factors need to be considered: Cooling capacity: The alternative cooling system must be able to provide sufficient cooling capacity to meet the heat dissipation requirements generated by the reducer during operation; Adaptability: The replacement cooling system needs to be compatible with the original reducer cooling system, taking into account the compatibility of connection, operation, control, etc. to ensure a smooth transition and normal operation; Reliability: When choosing an alternative cooling system, you need to consider its reliability and stability; Maintenance convenience: Choosing a system that is easy to maintain and use can reduce repair costs and downtime; Efficiency and energy consumption: Consider the energy consumption of alternative systems and select systems that provide efficient cooling and have energy-saving features to reduce operating costs and environmental impact; Cost-effectiveness: Consider the investment cost, operating cost and maintenance cost of alternative cooling systems and select a system with cost-effectiveness to ensure return on investment and overall benefits.

[0021] Among them, risk assessment includes the following steps: 31) Identify risks: Through professional team or expert consultation, identify the causes and impacts of all possible risk events of nuclear power reducers; 32) Evaluate risk probability: Use the dynamic Bayesian network model to evaluate the probability of each risk event occurring; The dynamic Bayesian network expands the static BN by adding a time dimension. It consists of static BNs on different time slices, and its probability distribution of transition probability is , the formula is as follows: ; Where: is the i-th node at the t-th time, for The parent collection of By using the established dynamic Bayesian network model to evaluate and predict the probability of risk events, various risk events can be quantitatively evaluated according to different conditions and scenarios.

[0022] 33) Assess the impact of each risk event after it occurs, and determine the level of each risk based on the probability and impact assessment results; Among them, the alternative cooling system includes an air cooling system, a liquid cooling system and an external heat dissipation cooling system. The air cooling system, the liquid cooling system and the external heat dissipation cooling system are connected in parallel or in series to increase the cooling capacity and redundancy, and improve the reliability and safety of the system; Water cooling system: uses water for cooling, absorbing and dissipating heat through a water cooler or water circulation system; Air cooling system: using fans or cooling towers to cool down the equipment through convection heat dissipation; External heat dissipation cooling system: refrigerant or other cooling medium is circulated outside the nuclear power reducer to dissipate heat through a heat exchanger.

[0023] Step 4: Check the alternative cooling system, and after normal operation, execute the automatic switching system for risk avoidance control, switching the main cooling system to the alternative cooling system; The process of switching the main cooling system to the alternative cooling system is as follows: first, before switching, the alternative cooling system must be comprehensively checked to see if the cooling medium, circulation system, and heat dissipation equipment are normal; then, according to the set automatic switching program, the automatic switching system is started to switch the main cooling system to the alternative cooling system; during the switching process, each key parameter is closely monitored, and after the switching is completed, the system is verified and tested; after the switching is completed, the key data and operation records of the switching process are synchronously recorded and reported; Step 5: After the system is switched, the operating conditions of the alternative cooling system are continuously monitored to ensure that it operates as expected. The normal operation of the alternative cooling system is ensured through system switching and continuous monitoring, and the continuity and stability of the system are guaranteed. Continuous monitoring of the operating conditions of the alternative cooling system can timely discover problems and prevent failures, ensure that the system operates as expected, and improve the reliability and safety of the system; Continuously monitoring the operating conditions of the alternative cooling system includes the following steps: 51) Obtain the operation status of the alternative cooling system in real time through sensors and understand the changes in various system parameters; 52) Record monitoring data and establish historical data records; 53) Regularly inspect the alternative cooling system and check the status of each part of the system; 54) Establish an emergency response mechanism to quickly respond and take emergency measures when abnormal conditions occur in the alternative cooling system; Step 6. At the same time, an alarm signal is issued to notify the operator to deal with the fault, and to perform maintenance on the original system and test or inspect the main cooling system of the nuclear power reducer. After the main cooling system is normal, it is put back online and switched back to normal operation. Timely alarms and emergency response mechanisms can respond quickly when abnormal conditions occur in the system, reduce the impact of the fault, ensure rapid recovery of the system, and protect the safety of equipment and personnel.

[0024] In this method, the pressure value, differential pressure value and oil temperature value of the main cooling system of the nuclear power reducer are monitored in real time by using sensors, the monitoring data are collected and transmitted to the analysis system, the relevant values ​​of the lubricating oil cooling system are collected in real time by using pressure transmitters, differential pressure transmitters and temperature transmitters, the data are converted into electrical signals and transmitted to a paperless recorder for recording and output, the monitoring data are analyzed by the Z-core method, potential risks are identified and alarms are issued, the degree of deviation between data points and the mean is calculated, abnormal data points are identified for abnormality detection, and the monitoring data are analyzed and alarms are issued, which can help operation and maintenance personnel to timely discover system abnormalities, take timely measures to deal with them, avoid fault escalation, evaluate risks, and select alternative cooling systems that provide sufficient cooling capacity. Professional teams identify risks, evaluate risk probabilities and impact levels, and determine risk levels, which can help decision makers understand the degree of potential risks more clearly, select corresponding alternative cooling systems in a targeted manner, and reduce the possibility of failures. By inspecting the alternative cooling system, executing the automatic switching system for risk avoidance control, switching the main cooling system to the alternative cooling system, continuously monitoring the operating conditions of the alternative cooling system after the switch, continuously monitoring the operating status of the alternative cooling system, regularly inspecting, recording monitoring data, and establishing an emergency response mechanism, system switching and continuous monitoring ensure the normal operation of the alternative cooling system and the continuity and stability of the system. Timely alarms and emergency response mechanisms can respond quickly to abnormal situations in the system, reduce the impact of failures, ensure rapid recovery of the system, and ensure the safety of equipment and personnel.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-cooling switching risk avoidance control method for a nuclear power reducer, characterized in that: The following steps are involved: S1. Use sensors to monitor the pressure value, differential pressure value and oil temperature value of the main cooling system of the nuclear power reducer in real time, collect monitoring data and transmit it to the analysis system; S2. Analyze monitoring data using the Z-score method to identify potential risks, determine the severity of the risk and the potential consequences of not taking action, and issue an alert; S3. Evaluate the risks and select an alternative cooling system that can provide sufficient cooling capacity to maintain safe operating conditions; S4, check the alternative cooling system, and after normal operation, execute the automatic switching system for risk avoidance control, and switch the main cooling system to the alternative cooling system; S5. After the system is switched, the operating conditions of the alternative cooling system shall be continuously monitored to ensure that it operates as expected; S6. At the same time, an alarm signal is issued to notify the operator to deal with the fault, and to perform maintenance on the original system and test or inspect the main cooling system of the nuclear power reducer. After the main cooling system is normal, it is put back online and switched back to normal operation.

2. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S1, the sensor includes an electronic pressure transmitter, an electronic differential pressure transmitter and an electronic temperature transmitter; the electronic pressure transmitter is used to monitor the pressure of the circulating oil in the cooling system; the electronic differential pressure transmitter is used to monitor the pressure difference on both sides of the filter to determine whether the filter element is blocked; the electronic temperature transmitter is used to monitor the temperature value of the oil outlet from the cooling system.

3. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S1, the collecting monitoring data and transmitting it to the detection system comprises the following steps: S11, using a pressure transmitter, a differential pressure transmitter and a temperature transmitter to respectively collect the pressure value, the differential pressure value and the oil temperature value of the lubricating oil cooling system in real time; S12, convert the measured value into an electrical signal, and output a 4-20mA current signal to the isolation transmitter; S13, the isolation transmitter outputs the corresponding 4-20mA current signal to the paperless recorder, which converts the received current signal into the actual measurement value for display, recording and output through configuration settings.

4. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S2, analyzing the monitoring data using the Z-score method to identify potential risks includes the following steps: S21. Calculate the degree of deviation between the data points in the data set and the mean. The Z-score calculation formula is as follows: ； Among them, Z is the deviation degree value, X is the value of the data point, is the mean of the data set, is the standard deviation of the data set; S22. The calculated value can represent the degree of deviation between the data point and the mean. The Z-score value whose absolute value is greater than the set threshold is considered to be an outlier. S23, identifying abnormal data points, and performing abnormality detection on the monitoring data of the reducer cooling system.

5. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S3, the alternative cooling system includes an air cooling system, a liquid cooling system and an external heat dissipation cooling system, and the air cooling system, the liquid cooling system and the external heat dissipation cooling system are connected in parallel or in series.

6. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S3, the risk assessment includes the following steps: S31. Identify risks: Identify all possible risk events, causes and impacts of nuclear power reducers through professional team or expert consultation; S32. Evaluate risk probability: Use the dynamic Bayesian network model to evaluate the probability of each risk event occurring; S33. Evaluate the impact of each risk event after it occurs, and determine the level of each risk based on the probability and impact assessment results.

7. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S4, switching the main cooling system to the alternative cooling system comprises the following steps: S41. Before switching, firstly, conduct a comprehensive inspection of the alternative cooling system to check whether the cooling medium, circulation system, and heat dissipation equipment are normal; S42, starting the automatic switching system according to the set automatic switching program, and switching the main cooling system to the alternative cooling system; S43. During the switching process, closely monitor various key parameters, and after the switching is completed, verify and test the system; S44. After the switching is completed, the key data and operation records in the switching process are synchronously recorded and reported.

8. A nuclear power reducer multi-cooling switching risk avoidance control method according to claim 1, characterized in that: In step S5, the operating conditions of the alternative cooling system are continuously monitored. The following steps are involved: S51. Obtain the operation status of the alternative cooling system in real time through sensors to understand the changes in various system parameters; S52, record monitoring data and establish historical data records; S53. Regularly inspect the alternative cooling system and check the status of each part of the system; S54. Establish an emergency response mechanism to respond quickly and take emergency measures when abnormal situations occur in the alternative cooling system.

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