A fuel assembly irradiation test method based on high-temperature high-pressure test loop

Abstract

The application discloses a kind of fuel assembly irradiation test methods based on high temperature high pressure test loop, it is related to the technical field of research reactor fuel irradiation, by determining the technical index parameter of fuel assembly irradiation test, the preliminary scheme of irradiation test system is designed, the safety analysis of the scheme under accident condition is carried out, and simulation is irradiated into the reactor, based on the results of safety analysis and test, determine the reactor time and the running state of device and system, finally, according to the reactor time and running state data, it is judged whether the fuel assembly in reactor core meets the technical index requirement in the simulation operation of research reactor;The method provides a set of systematic, standardized process, from the determination of technical index parameter to the final generation of irradiation test system, each has definite requirement and standard, so as to help improve work efficiency, reduce human error, and facilitate subsequent verification and improvement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of research reactor fuel irradiation, in particular to a fuel assembly irradiation test method based on a high-temperature and high-pressure test loop. BACKGROUND

[0002] Fuel irradiation test technology refers to a method of using neutrons and various rays generated by a research reactor to design and build a test system, control and regulate the irradiation conditions of a test object, and enable the test object to still accept safe irradiation under the strong radiation conditions in the reactor. From the proposal of fuel concept design to the engineering application of fuel assemblies, in-situ irradiation tests must be conducted on key objects such as fuel and cladding materials to comprehensively evaluate the irradiation resistance of the fuel, and then measure the safety, reliability, economy and advancement of the fuel assembly.

[0003] In addition, the steady-state irradiation test of a pressurized water reactor type fuel assembly in a research reactor is usually carried out in a high-temperature and high-pressure water test loop. The high-temperature and high-pressure test loop is a closed system, and its main loop mainly consists of an irradiation device, a pressure stabilizer, a main heat exchanger and a feedwater pump. The irradiation device is used for irradiation test, and the coolant parameters in the irradiation device, such as temperature, pressure, flow rate and water quality, are controlled by the irradiation test system alone. The heat generated by the test object and the structural components in the irradiation test system is carried away by the coolant of the irradiation test system, and there is no heat exchange between the research reactor main coolant.

[0004] In addition, the irradiation test of a fuel assembly not only involves the design of the core loading, the test loop system and the irradiation device, but also involves the engineering implementation of the loop system debugging, test operation and monitoring. It requires the cooperation of physical, thermal, mechanical, material, instrument control and electrical professionals to design and implement the test scheme, which has problems such as multiple design iterations and multiple implementation interfaces. And for different types of fuel assemblies, the irradiation test system needs to be redesigned, and then the corresponding engineering implementation content is carried out.

[0005] A domestic nuclear fuel assembly in-reactor irradiation test method is disclosed in Chinese patent (CN201811339296.4). This method improves the design of the reactor core to meet the requirements of the in-reactor irradiation test of the 10th fuel cycle of the Qinshan No. 2 nuclear power plant unit 2 reactor core. However, this method lacks the corresponding design of the test device and the loop system, so there is still a certain safety risk in the process of in-reactor test of the reactor core.

[0006] Therefore, we propose a method that can systematically optimize the irradiation test process of the fuel assembly. SUMMARY

[0007] In order to overcome the deficiencies in the background art, the present application discloses a kind of fuel assembly irradiation test methods based on high temperature high pressure test loop.

[0008] In order to achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0009] A kind of fuel assembly irradiation test methods based on high temperature high pressure test loop, comprising:

[0010] S1. Determine the technical index parameter of fuel assembly irradiation test;

[0011] S2. According to technical index parameter, obtain the core loading scheme, test assembly scheme, test device scheme, loop system operation scheme, irradiation safety protection scheme and quality assurance scheme;

[0012] S3. Based on the design scheme obtained in S2, safety analysis is carried out under accident condition;

[0013] S4. If the safety analysis result is unsafe, return to S2, and redesign the scheme;

[0014] S5. If the safety analysis result is safe, based on the design scheme of S2, test loop debugging is carried out;

[0015] S6. Combining the safety analysis result of S3 and the result of S5 test loop debugging, carry out fuel assembly irradiation test, analyze the time of fuel assembly out of the reactor, and the running state of test device and loop system in design scheme;

[0016] S7. According to the running state of test device and loop system, judge whether the fuel assembly in the core meets the technical index requirement in the simulation operation of research reactor;

[0017] S8. If not, return to S6, continue to carry out in-pile irradiation test;

[0018] S9. If it is satisfied, the fuel assembly is cooled and detected out of the reactor, the irradiation test of fuel assembly is ended, and the irradiation test result is obtained.

[0019] Preferably, the determination of the technical index parameter comprises the following:

[0020] S11. Confirm the technical index requirement of irradiation test, including power, burnup, temperature, pressure and water chemical environment index;

[0021] S12. According to the technical index requirement, design the preliminary framework of core loading, test device and cooling loop;

[0022] S13. Based on the preliminary framework of the core loading, the test device and the cooling loop, feasibility and matching demonstration of technical index requirements are performed to obtain the preliminary scheme of the core loading, the test device and the cooling loop and the determined technical index parameters.

[0023] Preferably, in the S13, the feasibility and matching demonstration of technical index requirements are specifically as follows:

[0024] S131. The neutron flux distribution and power density parameters in the core are evaluated by a calculation method, and the core thermal safety limit under different working conditions is analyzed.

[0025] S132. The mechanical strength and thermal performance of the test device are judged.

[0026] S133. The flow control and pressure regulation capacity of the cooling loop under different working conditions, and the interface compatibility between the core and the test device are evaluated.

[0027] S134. According to the results of S131, S132 and S133, the overall matching analysis of the preliminary framework of the core loading, the test device and the cooling loop is performed, and the feasibility of the preliminary framework of the core loading, the test device and the cooling loop is evaluated.

[0028] Preferably, the design process of each scheme in the S2 is as follows:

[0029] The core loading scheme includes physical calculation method, test core arrangement and test index parameter calculation results.

[0030] The test assembly scheme includes assembly structure parameters and interface requirements.

[0031] The test device scheme includes device structure design and measuring point arrangement design.

[0032] The system operation scheme includes subsystem design, interface requirement and operation program design.

[0033] The radiation safety protection scheme includes radiation protection management, radiation monitoring and radioactive waste treatment.

[0034] The quality assurance scheme includes file, design, item and process control.

[0035] Preferably, the safety analysis of the S3 includes core loading physical safety analysis, test device safety analysis, system safety analysis and accident safety analysis.

[0036] Preferably, the core loading physical safety analysis adopts the core thermal safety limit analysis to analyze whether the safety limit under different working conditions meets the requirements.

[0037] Preferably, the safety analysis of the test device comprises device mechanical analysis and thermal analysis, for analyzing the structural strength and thermal hydraulic characteristics of the test device under different working conditions.

[0038] Preferably, the system safety analysis adopts loop pipe safety analysis, for analyzing whether the strength of the loop system pipe meets the requirements under different working conditions.

[0039] Preferably, the accident safety analysis adopts a method combining probability theory and determinism, for analyzing the safety of the system and device under the accident working condition of multiple factors.

[0040] Preferably, the simulation irradiation test in S5 comprises in-pile test operation and cold and hot state debugging, wherein the in-pile test operation is used for checking whether there is structural interference between the test device and the research reactor main body when the fuel assembly is in the reactor, and the rationality of the in-pile test operation; the cold and hot state debugging is used for checking the working state of the loop system and the test device, and recording the in-pile operation data.

[0041] By adopting the technical scheme as described above, the present application has the following beneficial effects:

[0042] The present application discloses a fuel assembly irradiation test method based on a high-temperature and high-pressure test loop, which can quickly construct a targeted irradiation test system for any fuel assembly based on technical index parameters of different fuel assembly irradiation tests, so as to ensure the accuracy of the irradiation test results of the fuel assembly

[0043] In addition, the present application provides a systematic and standardized process, from the determination of technical index parameters to the final generation of the irradiation test system, each of which has clear requirements and standards, thereby helping to improve work efficiency, reduce human errors, and facilitate subsequent verification and improvement.

[0044] In addition, the feedback mechanism in the method can continuously optimize the design scheme, so as to gradually improve and optimize the entire irradiation test system, and ensure that all technical index requirements are met.

[0045] In addition, the detailed safety analysis can ensure the safety of the entire test process, and the detailed argumentation and design of the technical index parameters can ensure that the fuel assembly can stably operate under the predetermined conditions, thereby improving the reliability and stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 Fig. 1 is a flowchart of the present application;

[0047] Figure 2 Fig. 2 is a detailed schematic diagram of the present application. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be described below in combination with the accompanying drawings of the embodiments of the present application. In the description, it should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", "right" and the like only correspond to the accompanying drawings of the present application, and are for the convenience of describing the present application, and do not indicate or imply that the devices or elements indicated must have a particular orientation:

[0049] Embodiment 1 is:

[0050] In combination with the accompanying Figure 1 The fuel assembly irradiation test method based on the high-temperature and high-pressure test loop comprises:

[0051] S1. Determine the technical index parameters of the fuel assembly irradiation test;

[0052] The irradiation index demonstration mainly includes two parts, i.e., confirmation of technical index requirements and analysis and demonstration of key parameters. The technical index requirements generally mainly include temperature, pressure, burnup, water chemical environment and the like, and the feasibility and matching of the index are demonstrated from the aspects of the reactor core physics, the test device and the loop system, so as to obtain a preliminary scheme and clear technical index parameters;

[0053] S2. Obtain a reactor core loading scheme, a test assembly scheme, a test device scheme, a loop system operation scheme, an irradiation safety protection scheme and a quality assurance scheme according to the technical index parameters;

[0054] The various schemes designed constitute a preliminary overall scheme of the irradiation test system, and subsequent verification and testing are based on the preliminary overall scheme. If the verification result meets the requirements of the technical index, it can be determined that the design scheme meets the research reactor operation;

[0055] S3. Based on the design scheme obtained in S2, safety analysis is performed under accident conditions to ensure the safety during the entire test process;

[0056] S4. If the safety analysis result is unsafe, return to S2 to redesign the scheme;

[0057] S5. If the safety analysis result is safe, based on the design scheme of S2, test loop debugging is performed, the technical index parameters are demonstrated and designed in detail, so as to ensure that the fuel assembly can stably operate under the predetermined conditions, and improve the reliability and stability of the system;

[0058] S6. In combination with the safety analysis result of S3 and the test loop debugging result of S5, the fuel assembly irradiation test is performed, the out-of-pile time of the fuel assembly is analyzed, and the operation state of the test device and the loop system in the design scheme is analyzed;

[0059] Wherein after obtaining the safety analysis results and the simulated in-pile irradiation test results, test operation and monitoring are carried out, including test index monitoring, test data recording, system sampling monitoring, and test tracking calculation. Test index monitoring mainly monitors device and loop system parameters, and timely adjusts and controls loop flow, pressure, water quality and other parameters. Test data recording and tracking calculation mainly complete tracking calculation based on recorded parameters, and timely and effectively monitor the test process. System sampling monitoring mainly samples and analyzes the irradiation test environment according to the environmental requirements such as water chemistry of the irradiation test index, and indirectly monitors the technical state of the test assembly;

[0060] S7. According to the running state of the test device and the loop system, it is judged whether the fuel assembly in the core meets the technical index requirements in the simulated operation of the research reactor;

[0061] Wherein by carefully analyzing the out-of-pile time, the effectiveness and safety of the entire irradiation test process can be ensured, and reliable data support can be provided for the subsequent evaluation and application of the fuel assembly, therefore after obtaining the out-of-pile time and the running state of the test device and the loop system, out-of-pile cooling and detection are carried out, including test index evaluation, device temporary cooling, device transportation cutting and sorting, and irradiation test detection results. The test index evaluation should be comprehensively evaluated according to the monitoring data and the calculation data, and the out-of-pile operation should be carried out after meeting the irradiation test index requirements; the device temporary cooling should be regularly monitored for dose, and the transportation cutting should be carried out after meeting the dose requirements; the device transportation cutting should be carried out according to the corresponding cutting procedures and process flow, and the test assembly should be sorted; the irradiation test detection results should include irradiation test process data and post-irradiation test data;

[0062] And by analyzing the out-of-pile time, it can be determined whether the irradiation time of the fuel assembly in the reactor reaches the expected irradiation level, the irradiation progress of the fuel assembly in the reactor can be monitored, the irradiation time of the fuel assembly in the reactor can be ensured not to exceed the safety limit, the fuel assembly can be prevented from being damaged or other safety hazards due to excessive irradiation, the behavior data of the fuel assembly during the irradiation process can be collected, including the changes of temperature, pressure, flow and other parameters, and the effectiveness of the test scheme can be evaluated. If some parameters or design are found to be unreasonable, the test scheme can be adjusted and the test conditions can be optimized according to the analysis results;

[0063] It should be noted that the test loop and the irradiation test are cooperated to simulate the operating environment of the research reactor.

[0064] S8. If not, return to S6 to continue the in-pile irradiation test;

[0065] S9. If yes, the fuel assembly is out-of-pile cooled and detected, the irradiation test of the fuel assembly is ended, and the test results of the irradiation test are obtained;

[0066] The out-pile cooling and detection of the fuel assembly mainly includes test index evaluation, device temporary storage cooling, device transfer cutting and sorting, and irradiation test detection results.

[0067] The test index evaluation is a comprehensive evaluation based on monitoring data and calculation data, and the out-pile operation is performed after meeting the irradiation test index requirements.

[0068] The device temporary storage cooling is to periodically monitor the dose, and the transfer cutting is performed after meeting the dose requirements.

[0069] The device transfer cutting should be performed according to the corresponding cutting program and process flow, and the sorting of the test assembly is completed.

[0070] The irradiation test detection results include irradiation test process data and post-irradiation test data.

[0071] Embodiment 2:

[0072] The determination of the technical index parameters in S1 includes the following:

[0073] S11. Confirm the technical index requirements of the irradiation test, including power, burnup, temperature, pressure and water chemical environment index;

[0074] S12. Design the preliminary framework of the core loading, test device and cooling loop according to the technical index requirements;

[0075] S13. Based on the preliminary framework of the core loading, test device and cooling loop, demonstrate the feasibility and matching of the technical index requirements, obtain the preliminary scheme of the core loading, test device and cooling loop, and determine the technical index parameters.

[0076] In addition, in S13, the feasibility and matching of the technical index requirements are demonstrated as follows:

[0077] S131. Evaluate the neutron flux distribution, power density and other parameters in the core by calculation method, and analyze the core thermal safety limit under different working conditions;

[0078] S132. Judge the mechanical strength and thermal performance of the test device;

[0079] S133. Evaluate the flow control, pressure regulation ability of the cooling loop under different working conditions, and the interface compatibility between the core and the test device;

[0080] S134. According to the results of S131, S132 and S133, analyze the overall matching of the preliminary framework of the core loading, test device and cooling loop, and evaluate the feasibility of the preliminary framework of the core loading, test device and cooling loop.

[0081] Embodiment 3:

[0082] The design process of each scheme in S2 is as follows:

[0083] The core loading scheme includes physical calculation method, test core arrangement and test index parameter calculation results, and it should meet the test sample temperature, pressure and burnup index requirements, and at the same time meet the safety limit value requirements;

[0084] The test assembly scheme includes assembly structure parameters and interface requirements, and it should consider reasonable assembly arrangement, meet test index and heat exchange requirements;

[0085] The test device scheme includes device structure design and measuring point arrangement design, and it should consider sufficient measurement parameters and reasonable arrangement of measuring points, and can cooperate with the loop system to realize pressure matching, flow matching, and meet the test index;

[0086] The system operation scheme includes subsystem design, interface requirement and operation program design, and it should consider water chemical environment, loop measurement and flow regulation to meet the test requirements, loop system-heap key parameter transmission and safety signal linkage scheme, and loop system response scheme under accident conditions;

[0087] The radiation safety protection scheme includes radiation protection management, radiation monitoring and radioactive waste treatment, and it should consider radiation monitoring and protection of loop system, device, personnel, etc., and develop emergency procedures;

[0088] The quality assurance scheme includes file, design, item and process control, and it should consider the quality of management and technical activities in the whole cycle of irradiation test, cover the control of design, processing, debugging, operation, maintenance, etc. of test assembly, test device, core loading, loop system, etc., develop quality plan, form file record, and ensure that the whole cycle of irradiation test is in effective control state.

[0089] Embodiment 4:

[0090] The safety analysis of S3 includes core loading physical safety analysis, test device safety analysis, system safety analysis and accident safety analysis.

[0091] The core loading physical safety analysis adopts the safety limit value analysis of reactor thermal safety, which aims to analyze whether the safety limit value meets the requirements under different working conditions. The specific analysis process is as follows: ① steady-state analysis: under normal operating conditions, the temperature field, pressure field and flow distribution in the core are calculated to ensure that they are within the safety range;

[0092] ② transient analysis: considering various transient conditions (such as coolant loss, control rod insertion / withdrawal, etc.), the response of the core under these conditions is evaluated;

[0093] ③Limiting condition analysis: Analyze the performance of the core under extreme conditions, such as maximum power output, highest temperature, etc.

[0094] The test device safety analysis includes device mechanics analysis and thermal analysis, aiming to analyze the structural strength and thermal hydraulic characteristics of the test device under different operating conditions; the specific process of mechanics analysis is: using computational fluid dynamics (CFD) and heat conduction analysis to evaluate the stress distribution and deformation of the device under high temperature and high pressure environment, including static analysis: evaluating the stress and deformation of the device under static load; dynamic analysis: considering the influence of vibration, impact and other dynamic loads; fatigue analysis: evaluating the fatigue life of the device in long-term operation;

[0095] The specific process of thermal analysis is: using computational fluid dynamics (CFD) and heat conduction analysis to evaluate the temperature distribution and heat transfer efficiency in the device, including flow analysis: evaluating the flow state of the coolant in the device to ensure uniform cooling; heat transfer analysis: evaluating the heat transfer efficiency between the device and the coolant to ensure that the device will not overheat; thermal stress analysis: evaluating the thermal stress caused by temperature change to ensure that the device will not be damaged due to thermal stress;

[0096] The system safety analysis uses loop pipe safety analysis, aiming to analyze whether the strength of the loop system pipe meets the requirements under different operating conditions, to ensure that the pipes, pumps, valves and other components in the loop system have sufficient strength and reliability under various operating conditions; specific use of pressure vessel and pipe design standards (such as ASME specification) for structural strength and fatigue life analysis, including pressure analysis: evaluating the strength of pipes and equipment under different pressure conditions; fluid dynamics analysis: evaluating the influence of coolant flow on pipes and equipment; corrosion and wear analysis: evaluating the corrosion and wear of pipes and equipment in long-term operation.

[0097] The accident safety analysis uses a combination of probability theory and determinism to analyze the safety of the system and device under the accident conditions of various factors; the evaluation steps of probabilistic risk assessment (PRA) include: event identification: identifying possible accident events and their causes, frequency evaluation: evaluating the frequency of each event, and consequence analysis: evaluating the potential consequences of each event.

[0098] And the analysis steps of determinism analysis include: fault tree analysis: constructing a fault tree to analyze various fault paths leading to accidents, event tree analysis: constructing an event tree to analyze various possible development paths after the occurrence of an accident, and comprehensive evaluation: combining the results of probability theory and determinism to conduct a comprehensive risk assessment and develop appropriate safety measures and emergency plans.

[0099] Example 5:

[0100] The simulation irradiation test in S5 includes in-pile test operation and cold and hot state debugging, wherein the in-pile test operation is used to check whether the test device interferes with the main body of the research reactor when the fuel assembly is in the reactor, and the reasonability of the in-pile test operation; the cold and hot state debugging is used to check the working state of the loop system and the test device, and record the in-pile operation data; in addition, the structural integrity of the fuel assembly before and after the test is also checked.

[0101] In addition, from the perspective of stages, the method can also be divided into stage 1: irradiation index demonstration, corresponding to S1, stage 2: irradiation test scheme design, corresponding to S2, stage 3: safety analysis and review, corresponding to S3-S4, stage 4: loop system and device debugging, corresponding to S5, stage 5: test operation and detection, corresponding to S6, stage 6: out-of-pile cooling detection, corresponding to S7-S9, as shown in the accompanying Figure 2

[0102] The parts of the application not described in detail are prior art, and it is obvious for those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and the application can be realized in other specific forms without departing from the spirit or essential characteristics of the application; therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, the scope of the application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application, and any reference signs in the claims should not be regarded as limiting the claims involved.​

Claims

1. A fuel assembly irradiation test method based on a high-temperature and high-pressure test loop, characterized by: include: S1. Determine the technical parameters of the fuel assembly irradiation test; S2. Based on the technical indicators and parameters, obtain the core loading plan, test component plan, test device plan, loop system operation plan, irradiation safety protection plan, and quality assurance plan; S3. Based on the design solution obtained in S2, perform safety analysis under accident conditions; S4. If the safety analysis result is unsafe, return to S2 and redesign the solution; S5. If the safety analysis result is safe, then conduct test circuit debugging based on the design plan of S2; S6. Based on the safety analysis results of S3 and the results of the test loop commissioning of S5, conduct irradiation tests on the fuel assemblies, analyze the time it takes for the fuel assemblies to be unloaded from the reactor, and the operating status of the test equipment and loop system in the design. S7. Determine, based on the operating status of the test device and loop system, whether the fuel assemblies in the core meet the technical requirements during the simulated operation of the research reactor; S8. If not satisfied, return to S6 and continue the in-pile irradiation test; S9. If the conditions are met, the fuel assembly is removed from the stack for cooling and inspection, the irradiation test of the fuel assembly is completed, and the irradiation test results are obtained.

2. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 1, characterized in that: The determination of the technical indicator parameters includes the following: S11. Confirm the technical requirements for irradiation testing, including power, fuel consumption, temperature, pressure, and water chemical environment indicators; S12. Design the preliminary framework for core loading, test equipment, and cooling circuits based on technical specifications. S13. Based on the preliminary framework of core loading, test equipment and cooling circuit, conduct feasibility and compatibility demonstration of technical indicator requirements, obtain preliminary scheme of core loading, test equipment and cooling circuit and determine technical indicator parameters.

3. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 2, characterized in that: In S13, the feasibility and compatibility demonstration of the technical indicators are as follows: S131. Evaluate the neutron flux distribution and power density parameters within the reactor core through computational methods, and analyze the reactor thermal safety limits under different operating conditions; S132. Determine the mechanical strength and thermal performance of the test device; S133. Evaluate the cooling circuit's flow control and pressure regulation capabilities under different operating conditions, as well as its interface compatibility with the core and test equipment. S134. Based on the results of S131, S132, and S133, conduct an overall compatibility analysis of the preliminary framework of the core loading, test device, and cooling circuit, and evaluate the feasibility of the preliminary framework of the core loading, test device, and cooling circuit.

4. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 1, characterized in that: The design processes of each solution in S2 are as follows: The core loading plan includes physical calculation methods, test core arrangement and test index parameter calculation results; Test component solutions including component structure parameters and interface requirements; The test device plan includes the device structure design and measurement point layout design; The system operation plan includes subsystem design, interface requirements and operation program design; Radiation safety and protection programmes include radiation protection management, radiation monitoring and radioactive waste disposal; The quality assurance program includes controls on documents, designs, items and workmanship.

5. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 1, characterized in that: The safety analysis of S3 includes core loading physical safety analysis, test device safety analysis, system safety analysis and accident safety analysis.

6. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 5, characterized in that: The core loading physical safety analysis adopts reactor thermal safety limit analysis, which is used to analyze whether the safety limits under different operating conditions meet the requirements.

7. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 5, characterized in that: The safety analysis of the test device includes device mechanical analysis and thermal analysis, which are used to analyze the structural strength and thermal hydraulic characteristics of the test device under different working conditions.

8. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 5, characterized in that: The system safety analysis adopts loop pipeline safety analysis to analyze whether the loop system pipeline strength meets the requirements under different working conditions.

9. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 5, characterized in that: The accident safety analysis adopts a method combining probability theory and determinism to analyze the safety of systems and devices under accident conditions with multiple factors.

10. The fuel assembly irradiation test method based on a high-temperature and high-pressure test loop according to claim 1, characterized in that: The simulated in-pile irradiation test in S5 includes in-pile test operation and cold and hot commissioning. The in-pile test operation is used to check whether there is structural interference between the test device and the research reactor body when the fuel assembly is loaded into the stack, and the rationality of the in-pile test operation; the cold and hot commissioning is used to check the working status of the loop system and the test device, and record the operating data in the stack.

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