Method for detecting performance of catalytic plate of passive hydrogen recombiner of nuclear power plant

Abstract

The invention discloses a performance detection method for a catalytic plate of a passive hydrogen recombiner of a nuclear power plant. The performance detection method comprises the following steps: S1, building a multifunctional simulation experiment platform; s2, performing pre-experiment characterization on the catalytic plate sample to obtain pre-experiment characterization data; s3, placing the catalytic plate sample in a multifunctional simulation experiment platform, and carrying out normal operation environment simulation and serious accident environment simulation in sequence; s4, after the normal operation environment simulation is finished, taking out the catalytic plate sample, and carrying out multi-dimensional performance index detection to obtain a first-stage detection result; after the serious accident environment simulation is finished, taking out the catalytic plate sample again, and carrying out multi-dimensional performance index detection to obtain a second-stage detection result; and S5, based on a detection result, carrying out comprehensive performance evaluation on the catalytic plate sample. According to the invention, the whole life cycle complex service environment of the catalytic plate can be comprehensively simulated, the accident emergency capability and long-term durability of the catalytic plate are verified, and more reliable equipment performance guarantee is provided for safe operation of a nuclear power plant.

Description

Technical Field

[0001] This invention relates to the field of performance testing technology for safety equipment in nuclear power plants, and in particular to a method for testing the performance of catalyst plates in passive hydrogen recombiners in nuclear power plants. Background Technology

[0002] The passive hydrogen recombiner, as a core safety facility ensuring the safe operation of a nuclear power plant, has its core component, the catalytic plate, directly exposed to the atmospheric environment within the containment. During normal operation of a nuclear power plant, the atmosphere inside the containment is extremely complex, containing not only air but also water vapor, volatile organic compounds, dust aerosols, and other substances.

[0003] Catalytic converters, exposed to such complex environments over extended periods, are subject to the combined effects of multiple factors: water vapor condensation forming a liquid film on the surface may cover catalytically active components, reducing their ability to adsorb reactant molecules. Volatile organic compounds may compete for adsorption or deposit decomposition products on the catalytic surface. Dust aerosols may clog catalytic active sites or form physical covering layers. These effects gradually lead to a decrease in the catalytic activity and stability of the converter for hydrogen, and in severe cases, may result in the loss of hydrogen removal capacity, posing a potential threat to the safe operation of nuclear power plants.

[0004] Currently, performance testing methods for passive hydrogen recombination catalyst plates have significant limitations. Existing technologies mostly focus on simulating extreme environments such as high temperature, high humidity, and high hydrogen concentration under severe accidents to verify their emergency response capabilities. Furthermore, existing testing indicators are singular, typically focusing only on the final result of hydrogen removal efficiency, thus failing to comprehensively and accurately reflect the performance degradation patterns and long-term durability of the catalyst plate in actual service environments. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for testing the performance of the catalyst plate of a passive hydrogen recombination unit in a nuclear power plant.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a method for testing the performance of a passive hydrogen recombination catalytic plate in a nuclear power plant, comprising the following steps: S1: Construct a multi-functional simulation experimental platform; S2: Pre-experimental characterization data was obtained by characterizing the catalyst plate sample before the experiment; S3: Place the catalyst plate sample in the multifunctional simulation experimental platform and perform normal operation environment simulation and severe accident environment simulation in sequence; S4: After the normal operation environment simulation is completed, the catalyst plate sample is taken out for multi-dimensional performance index testing to obtain the first stage test results; after the severe accident environment simulation is completed, the catalyst plate sample is taken out again for multi-dimensional performance index testing to obtain the second stage test results. S5: Based on the results of the first stage test and the results of the second stage test, a comprehensive performance evaluation of the catalyst plate sample is performed.

[0007] Furthermore, the multifunctional simulation experimental platform in step S1 includes a reaction vessel, a composite environmental control system, and a multidimensional detection system; The composite environmental control system is used to independently or collaboratively regulate temperature, relative humidity, and hydrogen concentration, and can generate volatile organic compounds and dust aerosols with controllable concentrations. The multidimensional detection system is used for online monitoring of gas components, aerosol concentration, temperature, humidity, and catalytic activity.

[0008] Furthermore, the composite environmental control system maintains the stability of the environment inside the reaction vessel by adjusting the state parameters of the inlet gas and using the multidimensional detection system for feedback.

[0009] Furthermore, the pre-experimental characterization in step S2 includes at least one of the following analyses: The types and contents of organic compounds were analyzed using gas chromatography-mass spectrometry. The microscopic surface morphology was characterized using scanning electron microscopy; X-ray diffraction was used to analyze the phase composition and crystal structure. The specific surface area was determined using the BET nitrogen adsorption method.

[0010] Furthermore, the parameters for simulating the normal operating environment are: temperature of 30℃-50℃, relative humidity of 50%-80%, and volatile organic compounds and dust aerosols are introduced, with a simulation duration of 30 to 90 days; The parameters for simulating the severe accident environment are: temperature of 150℃-250℃, relative humidity of 85%-95%, hydrogen concentration of 2%-4%, and volatile organic compounds and dust aerosols are introduced. The simulation duration is 24 hours to 72 hours.

[0011] Furthermore, the multi-dimensional performance indicator detection in step S4 includes: Testing of basic catalytic performance: The catalytic activity is evaluated by calculating the hydrogen removal efficiency, wherein a hydrogen removal efficiency of not less than 25% is considered qualified; Anti-pollution performance testing: The types and contents of organic matter adsorbed were analyzed by gas chromatography-mass spectrometry, and the microscopic surface morphology was characterized by scanning electron microscopy, the phase composition and crystal structure were analyzed by X-ray diffraction, and the specific surface area was determined by BET nitrogen adsorption method to obtain the experimental characterization data. The pollutant resistance and environmental adaptability of the catalyst plate sample were comprehensively evaluated. Long-term stability testing: The efficiency deviation is evaluated by conducting multiple consecutive hydrogen catalytic cycle experiments on the catalyst plate sample and calculating the deviation value. A deviation value of ≤5% is considered acceptable.

[0012] Furthermore, both the basic catalytic performance test and the long-term stability test were conducted after the normal operation environment simulation and the severe accident environment simulation, by introducing hydrogen gas at a concentration of 1% into the catalyst plate and monitoring its concentration change.

[0013] Furthermore, the comprehensive performance evaluation in step S5 is as follows: a quantitative evaluation system is established, and the three indicators of basic catalytic performance, anti-pollution performance and long-term stability are assigned weights and weighted calculations are performed to obtain a comprehensive evaluation score.

[0014] Furthermore, in the quantitative evaluation system, the weight of the basic catalytic performance is 40%, the weight of the anti-pollution performance is 45%, and the weight of the long-term stability is 15%.

[0015] Furthermore, when the comprehensive evaluation score is ≥60 points, the catalyst plate sample is determined to meet the usage requirements.

[0016] By implementing this invention, the following beneficial effects are achieved: The present invention provides a method for testing the performance of a passive hydrogen recombiner catalyst plate in a nuclear power plant. It offers a segmented environmental simulation strategy that combines long-term simulation of normal operation with short-term simulation of severe accidents. This method accurately reproduces all the complex environmental scenarios that the catalyst plate may experience throughout its entire life cycle in a continuous experimental process, enabling the test results to more realistically reflect the actual service status of the catalyst plate. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic flowchart of a method for testing the performance of a passive hydrogen recombination catalyst plate according to an embodiment of the present invention. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] It should be noted that the flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0020] See Figure 1One embodiment of the present invention discloses a method for testing the performance of a passive hydrogen recombination catalytic plate in a nuclear power plant, comprising the following steps: S1: Build a multi-functional simulation experimental platform.

[0021] The multifunctional simulation experimental platform is the foundation for performing all subsequent simulations and tests, including reaction vessels, a composite environmental control system, and a multidimensional detection system.

[0022] The reaction vessel, as the core cavity, must be made of corrosion-resistant materials, such as 316L stainless steel, with an internal volume of not less than 50L to ensure a uniform internal gas flow field and avoid dead zones.

[0023] The composite environmental control system is used to independently or collaboratively regulate temperature, relative humidity, and hydrogen concentration, and is capable of generating volatile organic compounds (VOCs) and dust aerosols with controllable concentrations. Specifically, the composite environmental control system is used to precisely create and maintain the required complex environment. This system should be able to achieve independent or collaborative regulation of multiple parameters, with the temperature control range covering 20℃-250℃. The temperature control range is related to the normal operation environment simulation and severe accident environment simulation described below. The temperature control range for the normal operation environment simulation is 20℃-60℃, and the temperature control range for the severe accident environment simulation is 100℃-250℃. Relative humidity is continuously adjustable within the range of 5%-95%, and hydrogen concentration can be precisely controlled within the range of 0.1%-4%. Furthermore, the composite environmental control system also integrates a VOC generator and a dust aerosol generator. The VOC generator, for example, generates organic vapors with adjustable concentrations within the range of 0.01ppm-10000ppm by heating a container containing organic solvents such as benzene or toluene and then carrying them out and controlling them with a carrier gas. The dust aerosol generator can produce specific particulate matter with a particle size distribution of 0.1μm-10μm, such as BaSO4, SiO2, and Fe2O3 particles commonly found in containments, with concentrations adjustable from 0.1g / m³ to 100g / m³. Understandably, both the volatile organic compound (VOC) generator and the dust aerosol generator utilize existing, mature technologies.

[0024] A multidimensional detection system is used for online monitoring of gas components, aerosol concentration, temperature, humidity, and catalytic activity. This system, responsible for end-to-end monitoring and data acquisition, includes a gas chromatography-mass spectrometry (GC-MS) instrument, a laser particle size analyzer, a humidity transmitter, a temperature sensor, and an online monitoring module. The GC-MS instrument detects gas component concentrations with an accuracy of ±0.001%. The laser particle size analyzer monitors aerosol concentration online. The humidity transmitter continuously monitors the relative humidity within the reaction vessel in real time with an accuracy of ±1%RH. The temperature sensor continuously monitors the temperature inside the reaction vessel and key pipelines in real time with an accuracy of ±0.5℃. The online monitoring module monitors the catalytic activity of the catalytic reaction process in real time during normal operating environment simulation.

[0025] Furthermore, the composite environmental control system maintains the stability of the environment within the reaction vessel by adjusting the state parameters of the inlet gas and using a multi-dimensional detection system for feedback. As mentioned above, the multi-dimensional detection system may include a humidity transmitter and a temperature sensor. The catalyst plate sample test is conducted in a closed container. The normal environmental state of the reactor is maintained by adjusting the temperature and humidity of the inlet gas of the closed container, and changes in temperature and humidity in the reactor are detected by the temperature sensor and humidity transmitter.

[0026] S2: Pre-experiment characterization data is obtained by characterizing the catalyst plate sample before the experiment.

[0027] Representative catalyst plates were selected from the same batch of products as catalyst plate samples. Before conducting segmented environmental simulations and experiments, the samples needed to undergo comprehensive initial state characterization to establish a benchmark for subsequent comprehensive performance evaluation. Pre-experimental characterization methods included at least one of the following analyses, but not limited to all of them: analysis of organic matter types and contents using gas chromatography-mass spectrometry; characterization of microscopic surface morphology using scanning electron microscopy; analysis of phase composition and crystal structure using X-ray diffraction; and determination of specific surface area using the BET nitrogen adsorption method. All characterization data were recorded in detail.

[0028] S3: Place the catalyst plate sample in the multifunctional simulation experimental platform and perform normal operation environment simulation and severe accident environment simulation in sequence.

[0029] Among them, the simulation of the normal operating environment specifically includes setting the environmental parameters in the reaction vessel as: temperature 30°C - 50°C, for example 40%, relative humidity 50% - 80%, for example 60%. Under the condition of maintaining the stability of this environment, volatile organic compounds with a set concentration are continuously introduced through the composite environmental control system. For example, the toluene concentration is set at 100 ppm, and the concentration of BaSO4 particulate matter in the dust aerosol is set at 1 mg / m³. The simulation period lasts for 30 days - 90 days, for example 60 days, to simulate a long-term mild pollution process. After the simulation of the normal operating environment is completed, 1% hydrogen is introduced, and the outlet hydrogen concentration is continuously monitored until the catalytic reaction reaches a stable state or the conversion rate no longer changes significantly. Record the post-reaction concentration at this time and calculate the hydrogen removal efficiency. Among them, the hydrogen removal efficiency = (initial concentration - post-reaction concentration) / initial concentration × 100%).

[0030] The simulation of the severe accident environment specifically includes, after completing the simulation of the normal operating environment, for the catalytic plate sample that has experienced the simulation of the normal operating environment, the environmental parameters in the reaction vessel are switched to the severe accident working conditions: the temperature rapidly rises to 150°C - 250°C, the relative humidity increases to 85% - 95%, and 2% - 4% hydrogen is introduced into the reaction vessel. At the same time, to simulate the secondary pollution that may be caused by a severe accident, high-concentration volatile organic compounds are continuously introduced. For example, the toluene concentration is increased to 5000 ppm and the concentration of BaSO4 particulate matter in the dust aerosol is increased to 50 g / m³. The simulation period of this severe accident environment lasts for 24 hours - 72 hours. After the simulation of the severe accident environment is completed, 1% hydrogen is introduced, and the outlet hydrogen concentration is continuously monitored until the catalytic reaction reaches a stable state or the conversion rate no longer changes significantly. Record the post-reaction concentration at this time and calculate the hydrogen removal efficiency. Among them, the hydrogen removal efficiency = (initial concentration - post-reaction concentration) / initial concentration × 100%).

[0031] S4: After the simulation of the normal operating environment is completed, take out the catalytic plate sample for multi-dimensional performance index detection to obtain the first-stage detection result. After the simulation of the severe accident environment is completed, take out the catalytic plate sample again for multi-dimensional performance index detection to obtain the second-stage detection result.

[0032] Among them, after the simulation of the normal operating environment is completed, carefully take out the catalytic plate sample from the reaction vessel and immediately conduct multi-dimensional performance index detection on it to obtain the first-stage detection result. The content of the multi-dimensional performance index detection can include: Detection of basic catalytic performance: Evaluate the catalytic activity by calculating the hydrogen removal efficiency. Among them, the hydrogen removal efficiency not less than 25% is qualified. The hydrogen removal efficiency is a direct manifestation of the catalytic activity. Specifically, place the sample in a standard test device, introduce 1% hydrogen, monitor the change in the outlet hydrogen concentration, and calculate the hydrogen removal efficiency in this stage. The calculation method is as described above.

[0033] Anti-pollution performance testing: Immediately after extraction, the samples undergo the same full characterization process as in step S2. This includes analyzing the types and amounts of adsorbed organic matter using gas chromatography-mass spectrometry (GC-MS), characterizing the microscopic surface morphology using scanning electron microscopy (SEM), analyzing the phase composition and crystal structure using X-ray diffraction (XRD), and determining the specific surface area using the BET nitrogen adsorption method to obtain post-experimental characterization data. In other words, anti-pollution performance testing yields data after exposure to simulated normal operating conditions / long-term normal pollution environments. By comparing the post-experimental characterization data with the pre-experimental characterization data, qualitative and semi-quantitative assessments are made of the types and amounts of organic matter, changes in surface morphology, phase changes, and changes in specific surface area, thus evaluating the pollutant resistance and environmental adaptability of the catalytic plate sample.

[0034] Understandably, pollution resistance performance assessment focuses on qualitative to semi-quantitative comprehensive judgment using characterization methods. In practical applications, typical surface morphology image libraries and phase change feature libraries under different pollution levels can be established based on a large amount of experimental data to assist in rapid rating.

[0035] Long-term stability assessment: This is evaluated by conducting multiple consecutive hydrogen catalytic cycle experiments on the catalytic plate sample and calculating the efficiency deviation. A deviation value ≤5% is considered acceptable. Several rapid hydrogen catalytic cycle experiments can be performed on the catalytic plate sample, for example, 10-15 times, observing the changes in hydrogen removal efficiency and recording the efficiency for each cycle. If the maximum deviation value is ≤5%, its long-term stability is considered good. For example, in a 10-cycle hydrogen catalytic experiment, the maximum deviation value can refer to the deviation of the hydrogen removal efficiency from the 2nd to the 10th cycle relative to the hydrogen removal efficiency of the 1st cycle.

[0036] Understandably, after completing the normal operating environment simulation test, the same catalyst plate sample can be placed back into the reaction vessel of the multifunctional simulation experimental platform and entered into a severe accident environment simulation. Alternatively, in the initial experimental phase, at least two catalyst plate samples can be selected for the experiment. After completing the normal operating environment simulation test, only one catalyst plate sample can be removed, and the other can be immediately entered into a severe accident environment simulation.

[0037] After the severe accident environment simulation is completed, the catalyst plate sample is taken out again and subjected to the same multi-dimensional performance index tests as in the normal operation environment simulation to obtain the second-stage test results. The second-stage test results will reflect the catalyst plate sample's ability to withstand the impact of extreme accidents after long-term pollution accumulation and its residual performance level. Similarly, in the long-term stability assessment, the catalyst plate sample that has undergone a complete simulation cycle needs to be subjected to 10-15 consecutive hydrogen catalytic cycle experiments, for example, 10 times. The hydrogen removal efficiency is recorded for each cycle, and the deviation of the efficiency from the first cycle to the second to tenth cycles is calculated. If the maximum deviation value is ≤ 5%, its long-term stability is considered good.

[0038] S5: Based on the results of the first and second phases of testing, a comprehensive performance evaluation of the catalyst plate sample is conducted.

[0039] The comprehensive performance evaluation involves establishing a quantitative evaluation system. Weights are assigned to the three indicators—basic catalytic performance, anti-fouling performance, and long-term stability—and a weighted calculation is performed to obtain a comprehensive evaluation score. This system transforms the multi-dimensional performance indicators into a unified evaluation conclusion. In this system, basic catalytic performance has a weight of 40%, anti-fouling performance has a weight of 45%, and long-term stability has a weight of 15%. Each indicator is scored out of 100 based on its test results, such as hydrogen removal efficiency, characterization data rating, and deviation of hydrogen removal efficiency. These scores are then weighted and calculated to obtain the comprehensive evaluation score for the catalyst plate sample. Clear judgment criteria are established: for example, with a total score of 100, a comprehensive evaluation score ≥ 60 indicates that the catalyst plate sample meets the requirements for use in nuclear power plants. A comprehensive evaluation score < 60 indicates that it does not meet the requirements. This evaluation result provides a direct basis for the acceptance of the catalyst plate, the determination of in-service inspection cycles, and life prediction.

[0040] Understandably, the weighting (40%, 45%, 15%) and passing score (60 points) are optimal values ​​set based on extensive engineering experience and safety guidelines. In practical applications, these can be appropriately adjusted according to factors such as the safety margin requirements of a specific nuclear power plant and the design life of the catalyst plate.

[0041] By implementing this invention, the following beneficial effects are achieved: This invention provides a performance testing method for passive hydrogen recombiner catalyst plates in nuclear power plants. It offers a segmented environmental simulation strategy combining long-term simulation of normal operation with short-term simulation of severe accidents. This strategy accurately reproduces all complex environmental scenarios the catalyst plate may experience throughout its entire lifecycle within a continuous experimental process, enabling the test results to more realistically reflect the actual service status of the catalyst plate. Compared to traditional technologies, this method overcomes the limitations of traditional single-activity testing, constructing a multi-dimensional performance index testing system covering basic catalytic performance, anti-fouling performance, and long-term stability, achieving an upgrade from result detection to process diagnosis and comprehensive evaluation. Furthermore, this invention introduces a weighted quantitative comprehensive evaluation model, integrating the data from multi-dimensional performance index testing into an intuitive comprehensive score and setting clear engineering qualification thresholds. This provides nuclear power plant equipment management departments with a clear, consistent, and operable performance judgment tool, greatly enhancing the engineering application value of the test results. Moreover, the segmented environmental simulation strategy combining long-term simulation of normal operation with short-term simulation of severe accidents provides a performance evaluation basis covering the entire lifecycle of passive hydrogen recombiner catalyst plates in nuclear power plants. It can not only strictly guarantee its emergency response capability in the event of a serious accident, but also provide early warning of the risk of performance degradation caused by slow accumulation of contamination during long-term normal operation, thereby helping to achieve predictive maintenance, effectively reducing the probability of equipment failure, and improving the overall safety level of nuclear power plants.

[0042] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those skilled in the art, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention. These all fall within the protection scope of the present invention. That is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for testing the performance of a catalytic plate in a passive hydrogen recombination unit of a nuclear power plant, characterized in that, Includes the following steps: S1: Construct a multi-functional simulation experimental platform; S2: Pre-experimental characterization data was obtained by characterizing the catalyst plate sample before the experiment; S3: Place the catalyst plate sample in the multifunctional simulation experimental platform and perform normal operation environment simulation and severe accident environment simulation in sequence; S4: After the normal operation environment simulation is completed, the catalyst plate sample is taken out for multi-dimensional performance index testing to obtain the first stage test results; after the severe accident environment simulation is completed, the catalyst plate sample is taken out again for multi-dimensional performance index testing to obtain the second stage test results. S5: Based on the results of the first stage test and the results of the second stage test, a comprehensive performance evaluation of the catalyst plate sample is performed.

2. The method for testing the performance of the catalytic plate of a passive hydrogen recombination unit in a nuclear power plant according to claim 1, characterized in that, The multifunctional simulation experimental platform in step S1 includes a reaction vessel, a composite environmental control system, and a multidimensional detection system. The composite environmental control system is used to independently or collaboratively regulate temperature, relative humidity, and hydrogen concentration, and can generate volatile organic compounds and dust aerosols with controllable concentrations. The multidimensional detection system is used for online monitoring of gas components, aerosol concentration, temperature, humidity, and catalytic activity.

3. The method for testing the performance of the catalytic plate in a passive hydrogen recombination unit of a nuclear power plant according to claim 2, characterized in that, The composite environmental control system maintains the stability of the environment inside the reaction vessel by adjusting the state parameters of the inlet gas and using the sensors of the multidimensional detection system for feedback.

4. The method for testing the performance of the catalytic plate in a passive hydrogen recombination unit of a nuclear power plant according to claim 1, characterized in that, The pre-experimental characterization in step S2 includes at least one of the following analyses: The types and contents of organic compounds were analyzed using gas chromatography-mass spectrometry. The microscopic surface morphology was characterized using scanning electron microscopy; X-ray diffraction was used to analyze the phase composition and crystal structure. The specific surface area was determined using the BET nitrogen adsorption method.

5. The method for testing the performance of the catalyst plate in a passive hydrogen recombination unit of a nuclear power plant according to claim 1, characterized in that, The parameters for simulating the normal operating environment are: temperature of 30℃-50℃, relative humidity of 50%-80%, and volatile organic compounds and dust aerosols are introduced, with a simulation duration of 30 to 90 days; The parameters for simulating the severe accident environment are: temperature of 150℃-250℃, relative humidity of 85%-95%, hydrogen concentration of 2%-4%, and volatile organic compounds and dust aerosols are introduced. The simulation duration is 24 hours to 72 hours.

6. The method for testing the performance of the catalytic plate in a passive hydrogen recombination unit of a nuclear power plant according to claim 1, characterized in that, The multi-dimensional performance index detection in step S4 includes: Testing of basic catalytic performance: The catalytic activity is evaluated by calculating the hydrogen removal efficiency, wherein a hydrogen removal efficiency of not less than 25% is considered qualified; Anti-pollution performance testing: The types and contents of organic matter adsorbed were analyzed by gas chromatography-mass spectrometry, and the microscopic surface morphology was characterized by scanning electron microscopy, the phase composition and crystal structure were analyzed by X-ray diffraction, and the specific surface area was determined by BET nitrogen adsorption method to obtain the experimental characterization data. The pollutant resistance and environmental adaptability of the catalyst plate sample were comprehensively evaluated. Long-term stability testing: The efficiency deviation is evaluated by conducting multiple consecutive hydrogen catalytic cycle experiments on the catalyst plate sample and calculating the deviation value. A deviation value of ≤5% is considered acceptable.

7. The method for testing the performance of the catalytic plate of a passive hydrogen recombination unit in a nuclear power plant according to claim 6, characterized in that, Both the basic catalytic performance test and the long-term stability test were conducted after the normal operation environment simulation and the severe accident environment simulation, by introducing hydrogen gas at a concentration of 1% into the catalyst plate and monitoring its concentration change.

8. The method for testing the performance of the catalytic plate of a passive hydrogen recombination unit in a nuclear power plant according to claim 6, characterized in that, The comprehensive performance evaluation in step S5 is as follows: a quantitative evaluation system is established, and the three indicators of basic catalytic performance, anti-pollution performance and long-term stability are assigned weights and weighted calculations are performed to obtain a comprehensive evaluation score.

9. The method for testing the performance of the catalytic plate of a passive hydrogen recombination unit in a nuclear power plant according to claim 8, characterized in that, In the quantitative evaluation system, the weight of the basic catalytic performance is 40%, the weight of the anti-pollution performance is 45%, and the weight of the long-term stability is 15%.

10. The method for testing the performance of the catalyst plate in a passive hydrogen recombination unit of a nuclear power plant according to claim 8 or 9, characterized in that, When the comprehensive evaluation score is ≥60 points, the catalyst plate sample is deemed to meet the usage requirements.

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