Method, apparatus and fatigue simulation system for predicting crack propagation rate of heat transfer tube
By simulating the fatigue process of heat transfer tubes under different operating conditions using a fatigue simulation system, a crack propagation rate mapping relationship is constructed, which solves the problem of the difficulty in accurately predicting the fatigue crack propagation rate of heat transfer tubes and improves the safety and reliability of nuclear power plants.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NUCLEAR POWER ENGINEERING COMPANY LTD
- Filing Date
- 2026-03-09
- Publication Date
- 2026-06-12
AI Technical Summary
Existing technologies make it difficult to accurately predict the fatigue crack propagation rate of heat transfer tubes in steam generators, which affects the safety and reliability of nuclear power plants.
A fatigue simulation system is used to simulate the fatigue process of a heat transfer tube under different operating conditions through a stress application device and a working condition switching device. The relationship between crack length and stress is obtained, and a crack propagation rate mapping relationship is constructed to achieve accurate prediction.
This improves the scientific rigor and feasibility of crack propagation rate assessment, provides reliable safety risk assessment, and enhances the safety and reliability of nuclear power plants.
Smart Images
Figure CN122197453A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of nuclear power plant safety technology, and in particular to a method, equipment and fatigue simulation system for predicting the crack propagation rate of heat transfer tubes. Background Technology
[0002] In a nuclear power plant, a steam generator transfers heat generated by the nuclear reactor to the secondary loop, converting water in the secondary loop into steam. This steam then enters the turbine to perform work and drive the generator to produce electricity. The steam generator's tube bundle consists of numerous thin-walled heat transfer tubes. Inside the tubes is high-temperature, high-pressure water from the primary loop, while outside is the boiling, two-phase environment of the secondary loop. If a heat transfer tube cracks, it could block pipes in other units, posing a significant threat to the safety of the nuclear power plant.
[0003] Currently, heat transfer tube condition checks are mainly conducted during unit overhauls using eddy current testing. However, this method is often limited by workload, making it difficult to perform high-frequency, full-coverage checks on all heat transfer tubes. The contact area between the heat transfer tube and the support plate may develop scratches due to impact and wear, which can further evolve into early microcracks. If these cracks are not detected in time, continuous observation data on crack size will be lacking during subsequent operation, making it difficult to quantify the long-term crack propagation rate. In engineering practice, data often has to be obtained based on conservative experience to support analysis.
[0004] Therefore, how to accurately predict the fatigue crack propagation rate of the heat transfer tubes of a steam generator has become an urgent technical problem to be solved. Summary of the Invention
[0005] The main objective of this application is to provide a method, device, and fatigue simulation system for predicting the crack propagation rate of heat transfer tubes, aiming to accurately predict the fatigue crack propagation rate of heat transfer tubes in steam generators.
[0006] To achieve the above objectives, a first aspect of this application proposes a crack propagation rate prediction method applied to a fatigue simulation system. The fatigue simulation system includes a stress application device, a working condition switching device, and multiple pipe wall simulation components. Each pipe wall simulation component has a pre-formed circumferential crack on its surface, and the depth of the circumferential cracks in all the pipe wall simulation components is different. All the pipe wall simulation components are made of the same material. The stress application device is used to clamp the pipe wall simulation components. The method includes: A preset operating condition type is obtained, and the current operating condition type is determined through the operating condition switching device; wherein, the preset operating condition type includes the current operating condition type; The stress application device sequentially applies multiple preset stress values to each pipe wall simulation component, and obtains the circumferential crack and the crack length corresponding to each applied stress. The simulated propagation rate of the pipe wall simulation component is obtained by calculating the rate based on the crack length and the number of times the applied stress is applied. The current working condition type is switched by the working condition switching device, and the process of determining the current working condition type by the working condition switching device is repeated until all the preset working condition types are traversed. A mapping relationship is constructed based on the working condition type, the stress acting on the pipe wall simulation component, the depth of the circumferential crack in the pipe wall simulation component, and the simulated propagation rate corresponding to the pipe wall simulation component, to obtain the crack propagation rate mapping relationship; The crack propagation rate is predicted for the heat transfer tubes of the steam generator based on the crack propagation rate mapping relationship.
[0007] In some embodiments, the step of constructing a crack propagation rate mapping relationship based on the working condition type, the applied stress on the pipe wall simulator, the depth of the circumferential crack in the pipe wall simulator, and the simulated propagation rate corresponding to the pipe wall simulator includes: For each simulated pipe wall component, a mapping relationship is fitted based on the applied stress and the simulated propagation rate corresponding to the applied stress to obtain a candidate mapping relationship; An intermediate mapping relationship is constructed based on the circumferential crack depth of the simulated pipe wall and the candidate mapping relationship; The intermediate mapping relationships are grouped according to the working condition type to obtain at least two mapping relationship combinations, and all the mapping relationship combinations are used as the crack propagation rate mapping relationship.
[0008] In some embodiments, the fatigue simulation system further includes a voltage detection device for detecting voltage data across the pipe wall simulation component. The step of obtaining the crack length corresponding to each applied stress for the circumferential crack includes: Obtain the crack length mapping relationship; wherein, the crack length mapping relationship includes the relationship between the crack length of the pipe wall simulation component and the voltage data at both ends of the pipe wall simulation component; The voltage data of the pipe wall simulation component is obtained through the voltage detection device; The voltage data is mapped according to the crack length mapping relationship to obtain the crack length.
[0009] In some embodiments, obtaining the crack length mapping relationship includes: The voltage detection device is used to obtain the sample voltage of the pipe wall sample, the material of which is the same as that of the pipe wall simulation part, and the sample is not provided with the circumferential crack. The voltage detection device is also used to detect the sample voltage at both ends of the pipe wall sample. The surface of the pipe wall sample is scratched along the circumferential direction, and the crack length mapping relationship is obtained by fitting the mapping relationship between the scratch length of the pipe wall sample and the sample voltage.
[0010] In some embodiments, the operating condition switching device includes an environment switching module and an air temperature control module. The environment switching module is used to place the pipe wall simulation component in an air environment. The preset operating condition type includes a high-temperature air operating condition. Before applying multiple preset stress values sequentially to each pipe wall simulation component through the stress application device, the method further includes: In response to the current operating condition being the high-temperature air condition, acquire ambient air temperature data; If the ambient air temperature data is different from the preset first temperature, the air temperature control module will control the temperature until the ambient air temperature data reaches the first temperature.
[0011] In some embodiments, the operating condition switching device includes an environment switching module and a liquid temperature control module. The environment switching module is used to place the pipe wall simulation component in a liquid environment. The preset operating condition type includes a high-temperature liquid operating condition. Before applying multiple preset stress values sequentially to each pipe wall simulation component through the stress application device, the method further includes: In response to the current operating condition being the high-temperature liquid condition, acquire liquid ambient temperature data; If the liquid ambient temperature data is different from the preset second temperature, the liquid temperature control module will control the temperature until the liquid ambient temperature data reaches the second temperature.
[0012] In some embodiments, after detecting the crack propagation rate of the heat transfer tubes of the steam generator based on the crack propagation rate mapping relationship, the method further includes: The target expansion rate of the heat transfer tube is obtained based on the crack propagation rate. For each preset working time, the crack length is calculated based on the working time, the target expansion rate, and the surface cracks of the heat transfer tube to obtain a reference crack length; The operating strategy of the steam generator is determined based on the reference crack length, and the operation of the steam generator is controlled based on the operating strategy.
[0013] The crack propagation rate prediction method for heat transfer tubes proposed in this application applies stress to the heat transfer tube under different preset operating conditions using a fatigue simulation system to simulate fatigue. The crack length corresponding to the applied stress is then obtained, and the simulated propagation rate is calculated based on the crack length and the number of stress applications. A crack propagation rate mapping relationship is constructed after obtaining the applied stress and simulated propagation rate for different operating conditions. Finally, the crack propagation rate of the heat transfer tube is predicted based on this mapping relationship. This method avoids the shortcomings of relying on traditional experience or large amounts of experimental data, improves the scientificity and feasibility of crack propagation rate assessment, and provides a reliable reference for crack propagation when it is discovered, accurately assessing the potential safety risks and thus improving the safety and reliability of nuclear power plants.
[0014] To achieve the above objectives, a second aspect of this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect.
[0015] To achieve the above objectives, a third aspect of this application provides a fatigue simulation system, the fatigue simulation system comprising: Multiple pipe wall simulations, each of which has circumferential cracks pre-formed on its surface and the depth of the circumferential cracks is different in all of the pipe wall simulations; A stress application device is used to clamp the pipe wall simulation component and apply stress to the pipe wall simulation component; Operating condition switching device, which is used to switch the environment in which the pipe wall simulation component is located in order to simulate different operating conditions of the steam generator; The electronic device described in the second aspect is connected to both the stress application device and the operating condition switching device.
[0016] In some embodiments, the operating condition switching device includes an environment switching module and an air temperature control module, and the electronic device is connected to the environment switching module and the air temperature control module respectively. The environment switching module is used to place the pipe wall simulation component in an air environment.
[0017] In some embodiments, the operating condition switching device further includes a liquid temperature control module, the electronic device is also connected to the liquid temperature control module, and the environment switching module is also used to place the pipe wall simulation component in a liquid environment.
[0018] The fatigue simulation system proposed in this application integrates a stress application device, a working condition switching device, and multiple sets of pipe wall simulation components to construct a highly stable crack propagation simulation platform with controllable loading, adjustable environment, and reproducible experimental conditions. Functionally, the fatigue simulation system can apply multi-level cyclic stress loads to pipe wall simulation components with different initial crack depths, while simultaneously controlling the temperature conditions of the air or liquid environment, thereby simulating the high-temperature, high-pressure corrosion fatigue coupling effect of heat transfer tubes in steam generators during actual operation. Through the coordinated control of stress loading and environmental switching, the system can achieve dynamic regulation and high-frequency monitoring of the crack propagation process, effectively improving the acquisition efficiency and testing accuracy of crack propagation rate data. In terms of data output, the fatigue simulation system has a multi-channel sensor configuration, capable of outputting multi-source data including load parameters, crack length, voltage signals, and ambient temperature, providing high-quality data support for constructing crack propagation rate mapping relationships and life prediction models. Furthermore, the system possesses advantages such as modular structure, configurable parameters, and high experimental repeatability, making it widely applicable to fatigue performance evaluation and crack propagation behavior research of heat transfer tubes with different materials and structural forms. In summary, the fatigue simulation system has the advantages of controllable test process, accurate result output, and wide applicability. It significantly improves the simulation and prediction capabilities of crack behavior in heat transfer tubes of steam generators, and has good engineering promotion value and practical prospects.
[0019] To achieve the above objectives, a fourth aspect of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect. Attached Figure Description
[0020] Figure 1 This is a flowchart of the crack propagation rate prediction method provided in the embodiments of this application; Figure 2 This is a schematic diagram of the system architecture of the fatigue simulation system provided in the embodiments of this application; Figure 3 This is a schematic diagram of the pipe wall simulation component provided in the embodiments of this application; Figure 4 This is another flowchart of the crack propagation rate prediction method provided in the embodiments of this application; Figure 5 This is another flowchart of the crack propagation rate prediction method provided in the embodiments of this application; Figure 6 yes Figure 1 The flowchart of step S102 in the document; Figure 7 yes Figure 6 The flowchart of step S601 in the process; Figure 8 yes Figure 1 The flowchart of step S105 in the process; Figure 9 This is another flowchart of the crack propagation rate prediction method provided in the embodiments of this application; Figure 10 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application; Figure 11 This is an optional schematic diagram of the crack propagation mapping relationship provided in the embodiments of this application. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0022] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0024] First, let's analyze some of the terms used in this application: Stress concentration factor: A dimensionless parameter characterizing the increase in local stress at structural gaps or abrupt changes, defined as the ratio of the maximum local stress to the nominal stress.
[0025] Fatigue cycles (often denoted as cyc or N): also known as fatigue cycle number. It refers to the number of complete load cycles a material or component undergoes under cyclic loading, indicating how many times the loading-unloading cycle has been repeated.
[0026] In a nuclear power plant, a steam generator transfers heat generated by the nuclear reactor to the secondary loop, converting water in the secondary loop into steam. This steam then enters the turbine to perform work and drive the generator to produce electricity. The steam generator's tube bundle consists of numerous thin-walled heat transfer tubes. Inside the tubes is high-temperature, high-pressure water from the primary loop, while outside is the boiling, two-phase environment of the secondary loop. If a heat transfer tube cracks, it could block pipes in other units, posing a significant threat to the safety of the nuclear power plant.
[0027] Currently, heat transfer tube condition checks are mainly conducted during unit overhauls using eddy current testing. However, this method is often limited by workload, making it difficult to perform high-frequency, full-coverage checks on all heat transfer tubes. The contact area between the heat transfer tube and the support plate may develop scratches due to impact and wear, which can further evolve into early microcracks. If these cracks are not detected in time, continuous observation data on crack size will be lacking during subsequent operation, making it difficult to quantify the long-term crack propagation rate. In engineering practice, data often has to be obtained based on conservative experience to support analysis.
[0028] Therefore, how to accurately predict the fatigue crack propagation rate of the heat transfer tubes of a steam generator has become an urgent technical problem to be solved.
[0029] Based on this, embodiments of this application provide a method, device, and fatigue simulation system for predicting the crack propagation rate of a heat transfer tube, aiming to accurately predict the fatigue crack propagation rate of a heat transfer tube in a steam generator.
[0030] The crack propagation rate prediction method, device, and fatigue simulation system for heat transfer tubes provided in this application are specifically illustrated through the following embodiments.
[0031] Figure 1 This is an optional flowchart of the crack propagation rate prediction method provided in the embodiments of this application. Figure 1 The method described above is applied to a fatigue simulation system, which includes a stress application device, a working condition switching device, and multiple pipe wall simulation components. Each pipe wall simulation component has pre-formed circumferential cracks on its surface, and the depth of the circumferential cracks varies among all components. All pipe wall simulation components are made of the same material. The stress application device is used to clamp the pipe wall simulation components. Figure 1 The method may include, but is not limited to, steps S101 to S106.
[0032] Step S101: Obtain the preset working condition type and determine the current working condition type through the working condition switching device; wherein, the preset working condition type includes the current working condition type.
[0033] Step S102: Apply multiple preset stress values to each pipe wall simulation component sequentially using a stress application device, and obtain the circumferential crack length corresponding to each applied stress.
[0034] Step S103: Calculate the rate based on the crack length and the number of times the applied stress is applied to obtain the simulated propagation rate of the pipe wall simulation component.
[0035] Step S104: Switch the current working condition type through the working condition switching device, return to the current working condition type determined by the working condition switching device, and continue until all preset working condition types have been traversed.
[0036] Step S105: Based on the working condition type, the applied stress on the pipe wall simulation component, the depth of the circumferential crack in the pipe wall simulation component, and the simulated propagation rate corresponding to the pipe wall simulation component, a mapping relationship is constructed to obtain the crack propagation rate mapping relationship.
[0037] Step S106: Predict the crack propagation rate of the heat transfer tubes of the steam generator based on the crack propagation rate mapping relationship.
[0038] Steps S101 to S106 of this embodiment involve applying stress to the heat transfer tube under different preset operating conditions using a fatigue simulation system to simulate fatigue. The crack length corresponding to the applied stress is then obtained, and the simulated propagation rate is calculated based on the crack length and the number of stress applications. A crack propagation rate mapping relationship is constructed after obtaining the applied stress and simulated propagation rate for different operating conditions. Finally, the crack propagation rate of the heat transfer tube is predicted based on this mapping relationship. This method avoids the shortcomings of relying on traditional experience or large amounts of experimental data, improves the scientific rigor and feasibility of crack propagation rate assessment, and provides a reliable reference for crack propagation when it is detected, accurately assessing the potential safety risks and thus improving the safety and reliability of nuclear power plants.
[0039] The crack propagation rate prediction method for heat transfer tubes provided in this application is applied to a fatigue simulation system. First, the fatigue simulation system provided in this application will be introduced. Please refer to... Figure 2 , Figure 2 This is a schematic diagram of the system architecture of the fatigue simulation system provided in this application embodiment. The fatigue simulation system includes a stress application device, a working condition switching device, and multiple pipe wall simulation components. The pipe wall simulation components are structural parts designed based on the structural characteristics of the heat transfer tubes of a steam generator. In this embodiment, the pipe wall simulation components are not closed pipes, but rather boat-shaped. Please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of the structure of a pipe wall simulation component provided in this application embodiment, with a wall thickness less than or equal to 1 mm. Specifically, each pipe wall simulation component has a pre-formed circumferential crack on its surface, undergoes electrolytic polishing treatment, has a surface roughness Ra ≤ 0.05 μm, and has a stress concentration factor at the crack greater than or equal to 1.5. Furthermore, the depth of the circumferential cracks differs among all pipe wall simulation components. In this embodiment, the depth of the circumferential crack may include 30 mm. Up to 110 Due to the design of the support plate and heat transfer tube positions in nuclear power engineering applications, the scratches left on the heat transfer tubes are circumferential. Furthermore, all tube wall simulation components are made of the same material, and the number of tube wall simulation components can be adjusted according to actual needs; this embodiment does not impose a strict limitation on this.
[0040] A stress application device is used to clamp the pipe wall simulation and apply stress to it. In this embodiment, the stress application device may include a hydraulic clamping fixture and a fatigue testing machine. The hydraulic clamping fixture is equipped with a buckle for adapting to the fatigue testing machine and a Teflon insulating pad for anti-slip. The load range of the fatigue testing machine is 0 to 50 kN.
[0041] The operating condition switching device is used to switch the environment in which the pipe wall simulator is located to simulate different operating conditions of the steam generator. In this embodiment, the method of this embodiment needs to be performed on the pipe wall simulator in two operating conditions: high-temperature air condition and high-temperature liquid condition. In some embodiments, the operating condition switching device includes an environment switching module, an air temperature control module, and a liquid temperature control module. The environment switching module is used to place the pipe wall simulator in an air environment, and the environment switching module is also used to place the pipe wall simulator in a liquid environment. The environment switching module can be an electrically controlled driven moving platform connected to a stress application device to move the stress application device and the pipe wall simulator clamped on the stress application device according to control commands. The air temperature control module can be set in a high-temperature air chamber. When simulation is required under high-temperature air conditions, the pipe wall simulator is placed in the high-temperature air chamber through the environment switching module, and then the temperature is regulated by the air temperature control module to simulate a high-temperature air environment. Understandably, when simulations are required under high-temperature liquid conditions, the pipe wall simulation component is placed in a high-temperature and high-pressure reactor containing water through the environment switching module. Then, the liquid temperature control module is used to regulate the temperature to simulate the high-temperature liquid environment.
[0042] The fatigue simulation system in this embodiment also includes an electronic device for executing the crack propagation rate detection method provided in this application embodiment. This electronic device is connected to both the stress application device and the operating condition switching device. Specifically, the electronic device is connected to the environment switching module, the air temperature control module, and the liquid temperature control module, and is used to control these modules. The electronic device will be further described in subsequent embodiments.
[0043] The fatigue simulation system of this application integrates a stress application device, a working condition switching device, and multiple sets of pipe wall simulation components to construct a highly stable crack propagation simulation platform with controllable loading, adjustable environment, and reproducible experimental conditions. Functionally, the fatigue simulation system can apply multi-level cyclic stress loads to pipe wall simulation components with different initial crack depths and simultaneously control the temperature conditions of the air or liquid environment, thereby simulating the high-temperature and high-pressure corrosion fatigue coupling effect of heat transfer tubes in a steam generator during actual operation. Through the coordinated control of stress loading and environmental switching, the system can achieve dynamic regulation and high-frequency monitoring of the crack propagation process, effectively improving the acquisition efficiency and testing accuracy of crack propagation rate data. In terms of data output, the fatigue simulation system has a multi-channel sensor configuration, capable of outputting multi-source data including load parameters, crack length, voltage signals, and ambient temperature, providing high-quality data support for constructing crack propagation rate mapping relationships and life prediction models. Simultaneously, the system possesses advantages such as modular structure, configurable parameters, and high experimental repeatability, making it widely applicable to fatigue performance evaluation and crack propagation behavior research of heat transfer tubes with different materials and structural forms. In summary, the fatigue simulation system has the advantages of controllable test process, accurate result output, and wide applicability. It significantly improves the simulation and prediction capabilities of crack behavior in heat transfer tubes of steam generators, and has good engineering promotion value and practical prospects.
[0044] In step S101 of some embodiments, the preset operating condition type refers to an environmental category pre-set to simulate the stress and corrosion state of the heat transfer tube of the steam generator under different operating environments. In this embodiment, the preset operating condition types include high-temperature air condition and high-temperature liquid condition. The current operating condition type refers to the operating condition state actually applied to the simulated tube wall by the operating condition switching device within a certain time period. The current operating condition type can be determined according to the operating condition command output by the test control program of the operating condition switching device. For example, when the test control program first outputs the high-temperature air condition command, the code of the command is matched and queried in the pre-established command code and operating condition type correspondence table to determine that the current operating condition type is the high-temperature air condition.
[0045] It is understood that the operating condition switching device includes an environment switching module and an air temperature control module. The environment switching module is used to place the pipe wall simulation component in an air environment. It is also understood that after determining the current operating condition type to be a high-temperature air condition, adjustments to the simulation environment are necessary. Please refer to [link / reference needed]. Figure 4 Prior to step S102 in some embodiments, the method of this application embodiment may also include, but is not limited to, steps S401 to S402: Step S401: In response to the current operating condition being high-temperature air condition, acquire ambient air temperature data.
[0046] Step S402: If the ambient air temperature data is different from the preset first temperature, the temperature is controlled by the air temperature control module until the ambient air temperature data reaches the first temperature.
[0047] In step S401 of some embodiments, the ambient air temperature data refers to the temperature parameters of the current ambient air environment (i.e., the air temperature inside the air chamber). A thermocouple temperature sensor can be installed inside the high-temperature air chamber to detect the air temperature value around the pipe wall simulation component in real time, and transmit the detected data to the test control program for recording and retrieval.
[0048] In step S402 of some embodiments, the first temperature refers to a preset target temperature parameter to ensure that the pipe wall simulation component has uniform thermal boundary conditions under high-temperature air conditions. In this embodiment, the value of the first temperature is 325°C. The specific value of the first temperature can be adjusted according to actual needs, and this embodiment does not strictly limit it.
[0049] For example, the air temperature control module may include a ceramic heater, a closed-loop PID temperature controller and the aforementioned thermocouple temperature sensor. The thermocouple temperature sensor continuously collects the air temperature inside the chamber and transmits it to the PID temperature controller. The controller dynamically adjusts the output of the ceramic heater according to the temperature difference, so that the temperature inside the chamber stabilizes and approaches the first temperature, until the feedback value of the thermocouple temperature sensor stabilizes at 300°C, and then the next stage of fatigue loading test (i.e., step S102) is started.
[0050] Steps S401 to S402 as illustrated in this embodiment acquire and calibrate the ambient air temperature under high-temperature conditions in real time before stress loading, ensuring that the ambient air temperature data stabilizes at a first temperature. This ensures that the pipe wall simulation is subjected to crack propagation tests under uniform temperature conditions, avoids interference from ambient temperature fluctuations on crack propagation rate calculation results, improves the consistency and comparability of test data between different batches of pipe wall simulations, and guarantees that crack propagation tests are conducted under constant temperature conditions. This improves the accuracy and repeatability of crack propagation rate data and enhances the engineering applicability of crack propagation rate prediction results.
[0051] In other embodiments, the operating condition switching device includes an environment switching module and a liquid temperature control module. The environment switching module is used to place the pipe wall simulation component in a liquid environment, and the preset operating condition type includes a high-temperature liquid condition. It is understood that after determining the current operating condition type to be a high-temperature liquid condition, the simulation environment needs to be adjusted. Please refer to [link to relevant documentation]. Figure 5 Prior to step S102 in some other embodiments, the method of this application embodiment may also include, but is not limited to, steps S501 to S502: Step S501: In response to the current operating condition being a high-temperature liquid condition, acquire liquid ambient temperature data.
[0052] Step S502: If the liquid ambient temperature data is different from the preset second temperature, the liquid temperature control module is used to control the temperature until the liquid ambient temperature data reaches the second temperature.
[0053] In step S501 of some embodiments, the liquid environment temperature data refers to the real-time temperature parameter of the liquid on the outer surface of the envelope tube wall simulation component in the liquid environment. In this embodiment, the liquid is water. A high-temperature pressure-resistant temperature sensor can be installed inside the high-temperature autoclave. The temperature sensor is electrically connected to the test control program. The temperature sensor detects the liquid temperature inside the high-temperature autoclave in real time and transmits the detection result to the test control program for recording and judgment.
[0054] In step S502 of some embodiments, the second temperature refers to a preset target liquid temperature parameter for simulating the operating environment of the heat transfer tube of the steam generator under high-temperature liquid conditions. In this embodiment, the value of the second temperature is 325°C. The specific value of the second temperature can be adjusted according to actual needs, and this embodiment does not strictly limit it. The liquid temperature control module may include an electric heating rod, a circulating pump, and a temperature controller. The high-temperature autoclave is used to hold the liquid environment, the electric heating rod is used to heat the liquid, the circulating pump is used to enhance the liquid flow to ensure uniform temperature distribution, and the temperature controller is used to adjust the output power of the electric heating rod according to the feedback signal from the temperature sensor. When the temperature sensor detects that the liquid temperature has stabilized at the second temperature, the liquid environment temperature adjustment is completed, and then the subsequent fatigue loading test is carried out.
[0055] Steps S501 to S502, as shown in the embodiments of this application, involve real-time acquisition and adjustment of the liquid environment temperature under high-temperature liquid conditions before stress loading, so that the liquid environment temperature data can be stably reached the second temperature. This ensures that the pipe wall simulation component can carry out crack propagation tests under uniform liquid temperature conditions, and ensures that pipe wall simulation components with different crack depths can obtain comparable data under the same thermal boundary conditions. This improves the repeatability and consistency of crack propagation rate data, and enhances the reliability and engineering application value of the crack propagation rate prediction model.
[0056] In step S102 of some embodiments, the applied stress refers to the stress value formed by the periodic tensile load applied to the pipe wall simulation by the stress application device. Different load amplitudes are set using a fatigue testing machine, and the load is transferred to the pipe wall simulation by a hydraulic clamping fixture, causing the pipe wall simulation to generate corresponding stress levels. The preset values can be set according to the strength parameters of the pipe wall simulation, for example, they can be set to stress values that increase progressively from 200MPa, 250MPa, 300MPa, 350MPa, and 400MPa.
[0057] In some embodiments, the fatigue simulation system further includes a voltage detection device ( Figure 1 (Not shown in the diagram) The voltage detection device is used to detect the voltage data at both ends of the pipe wall simulation component. Specifically, the voltage detection device may include metal conductive contact terminals respectively disposed at both ends of the pipe wall simulation component and a voltage acquisition circuit. The conductive contact terminals are connected to electronic equipment through the voltage acquisition circuit, and the electronic equipment is used to store the specific voltage values. Please refer to [link to relevant documentation]. Figure 6 In some embodiments, the method for obtaining the crack length includes, but is not limited to, steps S601 to S603: Step S601: Obtain the crack length mapping relationship.
[0058] Step S602: Obtain voltage data of the pipe wall simulation component through a voltage detection device.
[0059] Step S603: Map the voltage data according to the crack length mapping relationship to obtain the crack length.
[0060] In step S601 of some embodiments, the crack length mapping relationship includes the relationship between the crack length of the pipe wall simulator and the voltage data at both ends of the pipe wall simulator.
[0061] Please see Figure 7 In some embodiments, step S601 may include, but is not limited to, steps S701 to S702: Step S701: Obtain the sample voltage of the pipe wall sample using a voltage detection device. The material of the pipe wall sample is the same as that of the pipe wall simulation component, and it does not have circumferential cracks. The voltage detection device is also used to detect the sample voltage at both ends of the pipe wall sample.
[0062] In step S702, the surface of the pipe wall sample is scratched along the circumferential direction, and the crack length mapping relationship is obtained by fitting the mapping relationship between the scratch length and the sample voltage.
[0063] In step S701 of some embodiments, the pipe wall sample is a simulated pipe wall without any processed cracks, and the sample voltage is the voltage across the two ends of the pipe wall sample.
[0064] In step S702 of some embodiments, circumferential scratches (depth error ±5%) are machined using a CNC lathe, with a scratch width ≤0.5mm. During the pre-scratching process, the correspondence between scratch length and sample voltage is determined using a voltage detection device employing the Direct Current Potential Drop (DCPD) method. Then, the crack length mapping relationship is fitted using finite element analysis, the specific form of which is shown in the following analytical expression: (1), Where y represents the scratch length; A, B1, and B2 are coefficients to be fitted; and x represents the sample voltage. In this embodiment, when the variance of the fitting result of the above analytical formula (1) is 0.987392, A = -0.055385, B1 = 0.005098, and B2 = 0.000003.
[0065] Steps S701 to S702 as shown in the embodiments of this application involve obtaining a reference voltage response based on a pipe wall sample without cracks, and under the condition of controlled variation of scratch length, gradually forming scratches of different depths and simultaneously measuring the corresponding voltage response data to construct a quantitative relationship model between scratch length and voltage, so as to adapt to the subsequent voltage inversion calculation process.
[0066] In step S602 of some embodiments, during the application of fatigue load, the resistance in the conductive path of the simulated pipe wall changes due to the change in crack length, resulting in a corresponding change in the voltage across its terminals. The method for obtaining the voltage data has been described in detail in the above embodiments and will not be repeated here.
[0067] In step S603 of some embodiments, the voltage data is input into the crack length relationship as shown in the analytical formula (1), and the calculated y value is the crack length.
[0068] Steps S601 to S603, as illustrated in this embodiment, establish a quantitative mapping relationship between crack length and voltage response. A voltage detection device is used to measure the voltage change across the simulated pipe wall in real time. The collected voltage data is input into the mapping model for inversion and solution, yielding the current crack length value of the simulated pipe wall. This achieves real-time identification and quantitative characterization of crack length. This method overcomes the insufficient accuracy and hysteresis response problems of traditional non-destructive testing methods in identifying and inferring the length of micro-cracks. It significantly improves the resolution, accuracy, and temporal continuity of crack monitoring data, possesses strong engineering applicability and scalability, and provides key technical support for predicting and evaluating the crack propagation rate of heat transfer tubes in steam generators.
[0069] In step S103 of some embodiments, the simulated propagation rate refers to the length increase of the circumferential crack in the simulated pipe wall per unit fatigue cycle. This indicates that a is the crack length and N is the number of times the applied stress is applied, i.e., the fatigue cycles.
[0070] In step S104 of some embodiments, switching the current operating condition type via the operating condition switching device means that after completing stress loading and rate calculation under a preset operating condition type, the pipe wall simulation component is transferred from the current environment to another preset environment via the environment switching module, and the corresponding temperature control module is activated to place the pipe wall simulation component in another preset operating condition type. For example, after completing all stress loading under high-temperature air conditions, the pipe wall simulation component is transferred to a high-temperature autoclave, and the liquid temperature control module is adjusted to 325°C. At this time, the current operating condition type is switched to high-temperature liquid conditions.
[0071] In step S105 of some embodiments, the crack propagation rate mapping relationship refers to the correspondence model between different applied stresses, circumferential crack depths, and simulated propagation rates under different operating conditions. See [reference needed]. Figure 11 , Figure 11 This is an optional schematic diagram of the crack propagation mapping relationship provided in an embodiment of this application. The scratch depth in the diagram is the depth of the circumferential crack.
[0072] Please see Figure 8 In some embodiments, step S105 may include, but is not limited to, steps S801 to S803: Step S801: For each simulated pipe wall component, a mapping relationship is fitted based on the applied stress and the simulated propagation rate corresponding to the applied stress to obtain a candidate mapping relationship.
[0073] Step S802: Construct intermediate mapping relationships based on the circumferential crack depth and candidate mapping relationships of the simulated pipe wall component.
[0074] Step S803: Group the intermediate mapping relationships according to the working condition type to obtain at least two mapping relationship combinations, and use all the mapping relationship combinations as crack propagation rate mapping relationships.
[0075] In step S801 of some embodiments, the candidate mapping relationship, i.e., the mapping relationship between applied stress and simulated propagation rate under the same pipe wall simulation component, can be fitted by the following analytical expression: (2), in, Indicates the simulated expansion rate. and These are all coefficients to be fitted. Indicates the applied stress. It represents the multiplication operation.
[0076] In step S802 of some embodiments, different pipe wall simulations correspond to different circumferential crack depths. The candidate mapping relationship for each pipe wall simulation is mapped to the circumferential crack depth, and the resulting mapping relationship is the intermediate mapping relationship. In this embodiment, for a scratch depth of 150µm, when the variance of the fitting result of the above analytical formula (2) is 0.966748, =6.95454*10-14, =5.83020. For a scratch depth of 110µm, when the variance of the fitting result of the above analytical equation (2) is 0.93142, =2.80279*10-14, =5.984259.
[0077] In step S803 of some embodiments, the working condition type of the pipe wall simulation component during the simulation process is first determined, and then the intermediate mapping relationship is clustered and assigned according to the working condition label, and respectively assigned to the mapping relationship set under the corresponding working condition category.
[0078] Steps S801 to S803, as illustrated in the embodiments of this application, achieve dynamic modeling of crack propagation rate under multi-factor driving by constructing a layered crack propagation rate mapping relationship, thus overcoming the limitations of traditional single-dependent variable models in terms of accuracy and wide applicability. The constructed mapping relationship not only reflects the nonlinear dependence between crack depth and propagation rate but also automatically switches the corresponding model according to the operating condition type, enabling accurate prediction of heat transfer tube crack behavior under different environmental conditions. This provides a structured and systematic modeling tool for heat transfer tube remaining life assessment and risk warning, demonstrating significant engineering application value.
[0079] In step S106 of some embodiments, the corresponding parameters are substituted into the crack propagation rate mapping relationship according to the operating condition type of the heat transfer tube of the actual steam generator, the crack depth obtained by detection, and the operating load level, so as to calculate the crack propagation rate of the heat transfer tube under the current operating condition.
[0080] Please see Figure 9 Following step S106 in some embodiments, the crack propagation rate prediction method for heat transfer tubes provided in this application may also include, but is not limited to, steps S901 to S903: Step S901: Obtain the target expansion rate of the heat transfer tube based on the crack propagation rate.
[0081] Step S902: For each preset working time, calculate the crack length based on the working time, target expansion rate, and surface cracks in the heat transfer tube to obtain a reference crack length.
[0082] Step S903: Determine the operating strategy of the steam generator based on the reference crack length, and control the operation of the steam generator based on the operating strategy.
[0083] In step S901 of some embodiments, the target propagation rate refers to a quantitative parameter obtained based on the crack propagation rate detection result, used to evaluate the crack growth trend of the heat transfer tube under current operating conditions. For example, under high-temperature liquid conditions, when the surface circumferential crack depth of the heat transfer tube is detected to be 160 μm and the operating stress level is 250 MPa, the target propagation rate under this condition can be calculated as 5 * 10⁻⁶ after consulting the mapping model. -6 mm / cyc.
[0084] In step S902 of some embodiments, the operating duration refers to the time parameter of the planned future operating cycle of the steam generator, used to predict the corresponding crack growth during crack propagation. The operating duration can be set to an operating cycle of 48 hours, 168 hours (i.e., one week), or longer, configured according to the operation scheduling and risk assessment strategy.
[0085] The reference crack length refers to the potential future length of the crack, calculated based on the operating time and initial crack state, given a known target crack propagation rate. Its calculation method can be found in the following analytical formula: (3), in, Indicates the reference crack length; Indicates the current crack length; Indicates the target expansion rate; This indicates the number of fatigue cycles calculated based on working hours and load frequency.
[0086] In step S903 of some embodiments, the operating strategy of the steam generator refers to the equipment operation management plan formulated based on the assessment results of the reference crack length. The operating strategy of the steam generator includes, but is not limited to, load-limited operation, phased shutdown for inspection, adjustment of operating parameters (such as temperature and pressure), or early initiation of maintenance procedures. The calculated reference crack length is compared with the preset assessment limit, and the corresponding strategy template is called according to the risk level classification result, and operating instructions are automatically generated. For example, when the reference crack length is 309 μm and the crack tolerance limit is 350 μm, it is determined to be a medium-risk level, and the operating strategy is adjusted to load-limited operation and reassessed after 48 hours.
[0087] Steps S901 to S903 of this embodiment, by constructing a crack length prediction mechanism based on the target propagation rate and runtime, and combining it with the automatic generation and control of an operation strategy driven by the reference crack length, effectively establish a closed-loop path from crack identification and rate prediction to operation regulation. Compared with traditional static evaluation methods, this method achieves forward prediction and dynamic intervention of the heat transfer tube structure degradation process, possessing advantages such as fast response, strong adaptability, and high control precision. This embodiment significantly improves the operational safety assurance capability and residual life utilization efficiency of steam generators, providing a highly reliable and implementable decision-making basis for the full-cycle health management of nuclear power plant equipment.
[0088] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described crack propagation rate prediction method. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.
[0089] Please see Figure 10 , Figure 10 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 1001 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 1002 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 1002 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1002 and is called and executed by the processor 1001 using the crack propagation rate prediction method of the embodiments of this application. Input / output interface 1003 is used to implement information input and output; The communication interface 1004 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 1005 transmits information between various components of the device (e.g., processor 1001, memory 1002, input / output interface 1003, and communication interface 1004); The processor 1001, memory 1002, input / output interface 1003 and communication interface 1004 are connected to each other within the device via bus 1005.
[0090] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described crack propagation rate prediction method.
[0091] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
[0092] The crack propagation rate prediction method, electronic device, and storage medium provided in this application simulate the fatigue of a heat transfer tube by applying stress under different preset operating conditions using a fatigue simulation system. The crack length corresponding to the applied stress is then obtained, and the simulated propagation rate is calculated based on the crack length and the number of stress applications. A crack propagation rate mapping relationship is constructed after obtaining the applied stress and simulated propagation rate for different operating conditions. Finally, the crack propagation rate of the heat transfer tube is predicted based on this mapping relationship. This method avoids the shortcomings of relying on traditional experience or large amounts of experimental data, improves the scientificity and feasibility of crack propagation rate assessment, and provides a reliable reference for crack propagation when it is detected, accurately assessing the potential safety risks and thus improving the safety and reliability of nuclear power plants.
[0093] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
[0094] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.
[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0096] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.
[0097] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0098] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0099] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.
[0100] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0101] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0102] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0103] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.
Claims
1. A method for predicting the crack propagation rate of a heat transfer tube, characterized in that, The method is applied to a fatigue simulation system, which includes a stress application device, a working condition switching device, and multiple pipe wall simulation components. Each pipe wall simulation component has a pre-formed circumferential crack on its surface, and the depth of the circumferential cracks is different for all the pipe wall simulation components. All the pipe wall simulation components are made of the same material. The stress application device is used to clamp the pipe wall simulation components. A preset operating condition type is obtained, and the current operating condition type is determined through the operating condition switching device; wherein, the preset operating condition type includes the current operating condition type; The stress application device sequentially applies multiple preset stress values to each pipe wall simulation component, and obtains the circumferential crack and the crack length corresponding to each applied stress. The simulated propagation rate of the pipe wall simulation component is obtained by calculating the rate based on the crack length and the number of times the applied stress is applied. The current working condition type is switched by the working condition switching device, and the process of determining the current working condition type by the working condition switching device is repeated until all the preset working condition types are traversed. A mapping relationship is constructed based on the working condition type, the stress acting on the pipe wall simulation component, the depth of the circumferential crack in the pipe wall simulation component, and the simulated propagation rate corresponding to the pipe wall simulation component, to obtain the crack propagation rate mapping relationship; The crack propagation rate is predicted for the heat transfer tubes of the steam generator based on the crack propagation rate mapping relationship.
2. The method according to claim 1, characterized in that, The process involves constructing a mapping relationship based on the operating condition type, the applied stress on the pipe wall simulator, the depth of the circumferential crack in the pipe wall simulator, and the simulated propagation rate corresponding to the pipe wall simulator, to obtain a crack propagation rate mapping relationship, including: For each simulated pipe wall component, a mapping relationship is fitted based on the applied stress and the simulated propagation rate corresponding to the applied stress to obtain a candidate mapping relationship; An intermediate mapping relationship is constructed based on the circumferential crack depth of the simulated pipe wall and the candidate mapping relationship; The intermediate mapping relationships are grouped according to the working condition type to obtain at least two mapping relationship combinations, and all the mapping relationship combinations are used as the crack propagation rate mapping relationship.
3. The method according to claim 1, characterized in that, The fatigue simulation system further includes a voltage detection device for detecting voltage data at both ends of the simulated pipe wall. Obtaining the crack length corresponding to each applied stress and the circumferential crack includes: Obtain the crack length mapping relationship; wherein, the crack length mapping relationship includes the relationship between the crack length of the pipe wall simulation component and the voltage data at both ends of the pipe wall simulation component; The voltage data of the pipe wall simulation component is obtained through the voltage detection device; The voltage data is mapped according to the crack length mapping relationship to obtain the crack length.
4. The method according to claim 3, characterized in that, The process of obtaining the crack length mapping relationship includes: The voltage detection device is used to obtain the sample voltage of the pipe wall sample, the material of which is the same as that of the pipe wall simulation part, and the sample is not provided with the circumferential crack. The voltage detection device is also used to detect the sample voltage at both ends of the pipe wall sample. The surface of the pipe wall sample is scratched along the circumferential direction, and the crack length mapping relationship is obtained by fitting the mapping relationship between the scratch length of the pipe wall sample and the sample voltage.
5. The method according to claim 1, characterized in that, The operating condition switching device includes an environment switching module and an air temperature control module. The environment switching module is used to place the pipe wall simulation component in an air environment. The preset operating condition type includes a high-temperature air operating condition. Before applying multiple preset stress values to each pipe wall simulation component sequentially through the stress application device, the method further includes: In response to the current operating condition being the high-temperature air condition, acquire ambient air temperature data; If the ambient air temperature data is different from the preset first temperature, the air temperature control module will control the temperature until the ambient air temperature data reaches the first temperature.
6. The method according to claim 1, characterized in that, The operating condition switching device includes an environment switching module and a liquid temperature control module. The environment switching module is used to place the pipe wall simulation component in a liquid environment. The preset operating condition type includes a high-temperature liquid operating condition. Before applying multiple preset stress values to each pipe wall simulation component sequentially through the stress application device, the method further includes: In response to the current operating condition being the high-temperature liquid condition, acquire liquid ambient temperature data; If the liquid ambient temperature data is different from the preset second temperature, the liquid temperature control module will control the temperature until the liquid ambient temperature data reaches the second temperature.
7. The method according to any one of claims 1 to 6, characterized in that, After detecting the crack propagation rate of the heat transfer tubes of the steam generator based on the crack propagation rate mapping relationship, the method further includes: The target expansion rate of the heat transfer tube is obtained based on the crack propagation rate. For each preset working time, the crack length is calculated based on the working time, the target expansion rate, and the surface cracks of the heat transfer tube to obtain a reference crack length; The operating strategy of the steam generator is determined based on the reference crack length, and the operation of the steam generator is controlled based on the operating strategy.
8. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method according to any one of claims 1 to 7.
9. A fatigue simulation system, characterized in that, The fatigue simulation system includes: Multiple pipe wall simulations, each of which has circumferential cracks pre-formed on its surface and the depth of the circumferential cracks is different in all of the pipe wall simulations; A stress application device is used to clamp the pipe wall simulation component and apply stress to the pipe wall simulation component; Operating condition switching device, which is used to switch the environment of the pipe wall simulation component to simulate different operating conditions of the steam generator; The electronic device as described in claim 8 is connected to both the stress application device and the operating condition switching device.
10. The fatigue simulation system according to claim 9, characterized in that, The operating condition switching device includes an environment switching module and an air temperature control module. The electronic device is connected to the environment switching module and the air temperature control module respectively. The environment switching module is used to place the pipe wall simulation component in an air environment.
11. The fatigue simulation system according to claim 10, characterized in that, The operating condition switching device also includes a liquid temperature control module, and the electronic device is also connected to the liquid temperature control module. The environment switching module is also used to place the pipe wall simulation component in a liquid environment.
12. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 7.