Method and system for detecting aging state of rubber dam of cold source system of nuclear power plant

Abstract

The invention relates to a nuclear power plant cold source system rubber dam aging state detection method and system.The nuclear power plant cold source system rubber dam aging state detection method comprises the steps that S1, historical rubber dam engineering data are obtained and subjected to statistical analysis, and sample layout data are obtained; s2, placing a sample at a position corresponding to the sample layout data, carrying out regular sampling detection on the sample, judging whether a defect exists or not, and if the defect exists, executing a step S3; s3, repairing the defect position of the sample; s4, material performance testing is conducted on the repaired sample and / or the sample without the defects, and a performance testing result is obtained; and S5, performing trend analysis based on the performance test result to obtain a service trend result. According to the method, samples are placed at corresponding positions, regular sampling detection and testing are carried out, and trend analysis is carried out, so that quantitative evaluation of the aging state of the rubber dam and accurate prediction of the service trend are realized.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring technology for nuclear power plant cold source systems, and more specifically, to a method and system for detecting the aging status of rubber dams in nuclear power plant cold source systems. Background Technology

[0002] Rubber dams in the cooling system of nuclear power plants are critical safety devices, primarily used to ensure the supply of cooling water under extreme operating conditions. Unlike traditional rubber dams used in inland waterways, rubber dams in nuclear power plants face a more severe marine environment, including salt spray corrosion, wave impact, marine organism adhesion, and sand and gravel abrasion, resulting in faster aging and a higher risk of failure.

[0003] Currently, existing life prediction methods in standards are based on accelerated aging tests in laboratories, which are difficult to reflect actual service environments and have insufficient prediction accuracy. In addition, due to the lack of effective data support, maintenance decisions are somewhat arbitrary, which may lead to over-maintenance or untimely maintenance, affecting the safe operation of nuclear power plants. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that, in view of the shortcomings of the existing life prediction methods in the above-mentioned existing standards, which are based on laboratory accelerated aging tests and are difficult to reflect the actual service environment, the present invention provides a method and system for detecting the aging status of rubber dams in the cold source system of nuclear power plants.

[0005] The technical solution adopted by this invention to solve its technical problem is: to construct a method and system for detecting the aging status of rubber dams in a nuclear power plant's cold source system. The method includes the following steps: Step S1: Obtain historical rubber dam project data and perform statistical analysis to obtain sample layout data; Step S2: Place the sample at the position corresponding to the sample layout data, and periodically sample and test the sample to determine if there are any defects. If there are defects, proceed to step S3. Step S3: Repair the defect locations on the sample; Step S4: Perform material property tests on the repaired sample and / or the sample without defects to obtain the performance test results; Step S5: Perform trend analysis based on the performance test results to obtain service trend results.

[0006] In one embodiment, in step S1, the sample layout data includes the number of samples and the sample placement location; and / or the samples include dam bags for water intake or intake; and / or the historical rubber dam engineering data includes historical dam bag lifespan data. Step S1 includes: The number of samples was obtained by statistically analyzing the historical dam bag lifespan data. The sample placement location was determined based on the actual service environment conditions of the rubber dam. The sample placement includes evenly placing the samples in each channel, with half of the samples placed on the water-facing side wall of the rubber dam and above the historical average tide level; the other half of the samples are placed on the bottom plate of the rubber dam.

[0007] In one embodiment, step S1, which involves periodically sampling and testing the sample to determine if there are defects, includes: The internal pressure of the dam bag is monitored to obtain internal pressure data, which is then compared with preset pressure data to determine whether the sample has defects.

[0008] In one embodiment, step S2, which involves periodically sampling and testing the sample to determine if there are defects, includes: The outer surface of the sample is inspected under normal inflation or depressurization conditions when isolation is met. If signs of damage are found during the inspection of the outer surface, the sample is determined to be defective.

[0009] In one embodiment, step S3 includes: The defect location of the sample is repaired using a corresponding defect repair method; wherein the defect repair method includes at least one of the following: screw mechanical extrusion repair, tower-type emergency plug leak sealing repair, cold bonding repair, and hot vulcanization repair.

[0010] In one embodiment, the sample includes a dam bag adhesive layer, adhesive material, and coated fabric. In step S4, the performance test results include at least: appearance test results, size test results, physicochemical property test results, adhesive strength test results, and tensile test results of fabric strips. Step S4 includes: The overall sample is subjected to external and dimensional inspections to obtain the appearance inspection results and the dimensional inspection results. The physicochemical properties of the rubber compound were tested, and the test results were obtained. The bonding strength test was conducted on the adhesive layer of the dam bag and the adhesive material to obtain the bonding strength test results; A tensile test of the fabric strip was conducted on the dam bag to obtain the tensile test results of the fabric strip.

[0011] In one embodiment, the tensile test results containing the fabric strip include the warp tensile strength of the dam bag; Tensile tests were conducted on the dam bag containing fabric strips, and the results of the tensile tests on the fabric strips included: The specific weight of water, the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height, and the designed dam height are obtained. The specific weight of water, the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height, and the designed dam height are then substituted into a preset tensile strength calculation formula to obtain the warp tensile strength of the dam bag. The preset tensile strength calculation formula includes: Where T is the calculated longitudinal tensile strength of the dam bag; The specific gravity of water; H1 is the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height; H1 is the designed dam height.

[0012] In one embodiment, the step of performing trend analysis based on the performance test results to obtain service trend results includes: Based on the performance test results, a linear regression analysis was performed to obtain the performance degradation trend line. And / or based on the performance test results, an Arrhenius model fitting analysis is used to obtain a lifetime prediction curve; The service trend result is determined based on the performance degradation trend line and / or the life prediction curve.

[0013] In one embodiment, step S6 is further included: The performance test results are compared and analyzed with the preset service acceptance criteria to obtain the comparison and analysis results. The final analysis results are determined based on the comparative analysis results and the service trend results.

[0014] This application also provides a system for detecting the aging status of rubber dams in a nuclear power plant's cold source system, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the methods described above.

[0015] The beneficial effects of this invention are that it provides a method and system for detecting the aging status of rubber dams in nuclear power plant cold source systems. The method includes the following steps: Step S1: Acquire historical rubber dam engineering data and perform statistical analysis to obtain sample layout data; Step S2: Place samples at the corresponding positions in the sample layout data and periodically sample and test the samples to determine if there are defects; if defects are found, proceed to Step S3; Step S3: Repair the defective positions of the samples; Step S4: Perform material performance testing on the repaired samples and / or samples without defects to obtain performance test results; Step S5: Perform trend analysis based on the performance test results to obtain service trend results. This invention achieves quantitative assessment of the aging status of rubber dams and accurate prediction of service trends by placing samples at corresponding positions, performing periodic sampling and testing, and conducting trend analysis. Attached Figure Description

[0016] 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 flowchart illustrating the method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to the present invention. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0018] like Figure 1 As shown, Figure 1 A flowchart illustrating the aging status detection method for rubber dams in nuclear power plant cold source systems according to the present invention.

[0019] The technical solution adopted by this invention to solve its technical problem is: to provide a method for detecting the aging status of rubber dams in a nuclear power plant's cold source system, comprising the following steps: Step S1: Obtain historical rubber dam project data and perform statistical analysis to obtain sample layout data; In this step, historical data on the operational years, failure modes, environmental conditions, and material types of existing rubber dams are collected. Statistical methods are then used to analyze their aging patterns to determine the optimal location and quantity of samples. For example, samples should cover key stress areas such as the water-facing side, bottom plate, and sidewalls of the dam bag, taking into account environmental factors such as tides, salt spray, and marine organism attachment.

[0020] Step S2: Place the sample at the position corresponding to the sample layout data, and periodically sample and test the sample to determine if there are any defects. If there are defects, proceed to step S3.

[0021] In this step, the sample is prepared simultaneously with the dam bag manufacturing stage, using materials and processes completely identical to the dam bag. The sample size is no less than 500mm × 500mm, and the cross-section is coated with sealant to simulate the boundary conditions of the dam bag. The sample is fixed to the dam sidewalls and base plate with stainless steel bolts to ensure it is in the same service environment as the dam bag.

[0022] Step S3: Repair the defect location of the sample.

[0023] If defects affecting service performance are found in the sample during this step, they should be repaired promptly. Repair methods include mechanical extrusion, cold bonding, and hot vulcanization, with the specific choice determined based on the type and size of the defect. After repair, ensure the sample surface is smooth and well-sealed to prevent seawater infiltration from affecting subsequent test results.

[0024] Step S4: Perform material property tests on the repaired sample and / or the sample without defects to obtain the performance test results.

[0025] In this step, a sample is taken at a preset time limit for material performance testing. The test items include: Shore hardness, tensile strength, elongation at break, tear strength, flexural fatigue, interlaminar bond strength, and overall tensile strength.

[0026] Step S5: Perform trend analysis based on the performance test results to obtain service trend results.

[0027] In this step, the test results are compared with the initial performance and service acceptance criteria. Linear regression or an Arrhenius model is used to fit the performance degradation curve to predict the performance change trend over the next two years. If key performance indicators (such as tensile strength and bond strength) are close to or below the acceptable threshold, a replacement plan should be developed in advance.

[0028] This invention obtains performance change data of rubber dam materials under actual service environment through regular sampling and testing, achieving a scientific and quantitative assessment of aging status. This overcomes the shortcomings of traditional methods that rely solely on manual visual inspection and cannot reflect the internal performance degradation of materials. Furthermore, compared to accelerated aging tests in the laboratory, this invention, based on sample testing data from real service environments and combined with a trend analysis model, significantly improves the accuracy and reliability of rubber dam life prediction, avoiding premature or delayed replacement due to prediction errors. In addition, through performance trend analysis, this invention can predict the performance degradation trend of rubber dams two years in advance, providing data support for nuclear power plant operation and maintenance personnel to rationally arrange spare parts procurement and replacement plans, optimize maintenance decisions and operation and maintenance management, reduce operation and maintenance costs, and improve system reliability. As a key passive equipment in the cooling source system of nuclear power plants, the failure of rubber dams may lead to cooling water interruption, affecting nuclear safety. This invention, through scientific aging management methods, effectively prevents the risk of sudden failure of rubber dams and ensures the long-term stable operation of the nuclear power plant cooling source system. This invention is not only applicable to nuclear power plant cooling source systems but can also be extended to the aging management of rubber dams in other important water conservancy facilities, possessing broad engineering application prospects and economic benefits.

[0029] Furthermore, in step S1, the sample layout data includes the number of samples and the sample placement location; or / and the samples include dam bags used for water intake or intake; or / and the historical rubber dam engineering data includes historical dam bag service life data; step S1 includes: statistically analyzing the historical dam bag service life data to obtain the number of samples; and obtaining the sample placement location based on the actual service environment conditions of the rubber dam; wherein, the sample placement location includes evenly placing the samples in each flow channel, with half of the samples placed on the water-facing side wall of the rubber dam and above the historical average tide level; and the other half of the samples placed on the bottom plate of the rubber dam.

[0030] It should be noted that the historical rubber dam project data includes information such as the service life of the dam bags, failure modes, environmental conditions, and material types. The number of samples was determined through statistical analysis of the historical dam bag service life data; the sample placement location was determined based on the actual service environment conditions of the rubber dam.

[0031] The sample layout data includes the number of samples and their placement locations. The samples include dam bags used for water intake or intake. The sample placement involves evenly distributing the samples in each channel, with half of the samples placed on the upstream side wall of the rubber dam, above the historical average tide level; the other half are placed on the bottom plate of the rubber dam. The samples are anchored to the dam body using stainless steel bolts to ensure they are in the same service environment as the dam bags.

[0032] Furthermore, in step S1, the periodic sampling and testing of the sample to determine whether there are defects includes: monitoring the internal pressure of the dam bag, obtaining internal pressure data, and comparing it with preset pressure data to determine whether the sample has defects.

[0033] In one embodiment, a pressure sensor is installed inside the dam bag to monitor changes in internal pressure in real time. When the internal pressure data is significantly lower than the preset pressure data, it indicates that the dam bag may have air leakage or damage defects, and the defects should be repaired in a timely manner.

[0034] Furthermore, in step S2, the periodic sampling and testing of the sample to determine whether there are defects includes: inspecting the outer surface of the sample under normal inflation or depressurization conditions when isolation is met; if signs of damage are found during the inspection of the outer surface, the sample is determined to have defects.

[0035] Specifically, during normal operation of the rubber dam, the dam bag is inflated. At this time, the outer surface of the sample exposed above the water surface can be visually inspected or examined using tools such as a magnifying glass or stereomicroscope. In special circumstances, such as when isolation conditions are met, the dam bag can be depressurized to allow for a comprehensive inspection of the sample's outer surface. If cracks, bulges, wear, delamination, perforations, or other signs of damage are found on the sample's outer surface, the sample is considered defective.

[0036] Furthermore, step S3 includes: applying a corresponding defect repair method to the defect location of the sample; wherein the defect repair method includes at least one of screw mechanical extrusion repair, tower-type emergency plug leak sealing repair, cold bonding repair, and hot vulcanization repair. The applicable scope and advantages and disadvantages of each repair method are shown in Table 1 below.

[0037] Table 1. Comparison of the applicable scope, advantages and disadvantages of defect repair methods.

[0038] Furthermore, the sample includes a dam bag adhesive layer, an adhesive compound, and a coated fabric. In step S4, the performance test results include at least: appearance inspection results, dimensional inspection results, physicochemical property test results, adhesive strength test results, and tensile test results of the fabric strip. Step S4 includes: performing external and dimensional inspections on the entire sample to obtain the appearance inspection results and the dimensional inspection results; performing physicochemical property tests on the adhesive compound to obtain the physicochemical property test results; conducting an adhesive strength test on the dam bag adhesive layer and the adhesive compound to obtain the adhesive strength test results; and conducting a tensile test on the dam bag containing the fabric strip to obtain the tensile test results of the fabric strip.

[0039] It should be noted that the appearance inspection involves conducting an external inspection of the entire sample to observe for defects such as cracks, bulges, wear, delamination, and perforations.

[0040] Dimensional inspection: Measure the thickness, length, width and other dimensions of the sample to ensure that the sample dimensions meet the design requirements.

[0041] Physicochemical property testing: The rubber compound is tested for physicochemical properties such as Shore hardness, tensile strength, elongation at break, tear strength, and flexural fatigue.

[0042] Bond strength test: The bond strength between the dam bag's adhesive layer and the adhesive material is tested to ensure that the interlayer bond is firm.

[0043] Tensile testing of fabric strips: Tensile testing of coated fabric strips is performed to evaluate its tensile strength and load-bearing capacity. The performance testing items, standard methods, and equipment accuracy requirements for rubber dam samples are shown in Table 2.

[0044] Table 2. Requirements for Performance Testing of Rubber Dam Samples.

[0045] In one specific embodiment, when performing performance testing on samples of rubber dams in a nuclear power plant's cold source system, the entire dam bag sample undergoes macroscopic and microscopic inspections, as well as dimensional checks. Macroscopic inspections utilize a portable magnifying glass or stereomicroscope to observe the surface of the dam bag for defects such as cracks, bulges, wear, and delamination. Microscopic inspections are used to identify potential signs of early aging. Dimensional checks use vernier calipers to measure the thickness, length, and width of the dam bag to ensure it meets design requirements.

[0046] The retained rubber samples underwent physicochemical property testing, specifically including Shore hardness testing (according to GB / T 531.1), tensile strength and elongation at break testing (according to GB / T 528), tear strength testing (according to GB / T 529), and flexural fatigue testing (according to GB / T 1688). These tests comprehensively assess changes in the physical and mechanical properties of the rubber compound.

[0047] The adhesive strength of the retained dam bag's adhesive layer and the inner and outer adhesive layers was tested (according to GB / T 532) to ensure that the interlayer bonding was firm and to prevent the dam bag from breaking due to adhesive failure.

[0048] Finally, a tensile test with fabric strips was conducted on the retained dam bag samples (according to SL 235), and the measured value should be greater than or equal to the calculated warp tensile strength T under a certain safety factor.

[0049] Furthermore, the tensile test results of the fabric strip include the warp tensile strength of the dam bag; A tensile test of fabric strips was conducted on the dam bag to obtain the tensile test results of the fabric strips, including: obtaining the water density, the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height, and the designed dam height. The water density, the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height, and the designed dam height were substituted into a preset tensile strength calculation formula to obtain the warp tensile strength of the dam bag. The preset tensile strength calculation formula includes: Where T is the calculated longitudinal tensile strength of the dam bag; The specific gravity of water; H1 is the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height; H1 is the designed dam height.

[0050] Furthermore, the step of performing trend analysis based on the performance test results to obtain service trend results includes: performing linear regression analysis based on the performance test results to obtain a performance degradation trend line; and / or performing Arrhenius model fitting analysis based on the performance test results to obtain a life prediction curve; and determining the service trend results based on the performance degradation trend line and / or the life prediction curve.

[0051] Specifically, linear regression analysis fits historical performance test data to obtain a trend line of performance indicators changing over time, thereby predicting future performance trends. The Arrhenius model, on the other hand, considers the impact of environmental factors such as temperature and humidity on the material aging rate, establishing a life prediction model and obtaining a life prediction curve. By comprehensively analyzing the performance degradation trend line and the life prediction curve, the service trend of rubber dams can be determined more accurately, providing a scientific basis for maintenance decisions.

[0052] Furthermore, it also includes step S6: comparing and analyzing the performance test results with the preset service acceptability criteria to obtain the comparison analysis results; and determining the final analysis results based on the comparison analysis results and the service trend results.

[0053] In one embodiment, if all performance indicators meet the service acceptance criteria, the rubber dam can continue to operate normally, and the data from the above tests are analyzed for trends on an annual basis. If any performance indicator fails to meet the acceptance criteria, further trend analysis and evaluation are conducted to determine whether the rubber dam should continue to operate.

[0054] Specifically, the preset service acceptance criteria include the thickness variation range of the dam bag sample, the hardness range of the rubber compound, the tensile strength threshold, the elongation at break threshold, the tear strength threshold, the flexural fatigue threshold, the bond strength threshold, and the tensile strength threshold of the coated fabric. The performance test results are compared and analyzed with the preset service acceptance criteria to obtain the comparative analysis results. Combining the comparative analysis results with the service trend results, the final analysis results are determined. If the performance indicators exceed the service acceptance criteria range, or if the service trend results indicate that the performance will continue to deteriorate, a replacement plan should be formulated in advance to ensure the safe operation of the rubber dam. The service acceptance criteria for rubber dams are shown in Table 3.

[0055] Table 3. Acceptable service criteria for rubber dams.

[0056] This invention achieves a scientific assessment and lifespan prediction of rubber dams by deploying samples identical to those made of the same material as the dam bags in actual service environments and periodically sampling and testing their performance changes. Combined with trend analysis, this approach not only applies to nuclear power plant cooling systems but also provides a reference for the aging management of rubber dams in important inland waterways.

[0057] This patented technical solution has the following significant advantages: (1) This invention innovatively proposes a method of "synchronous sample retention, service under the same operating conditions, and dynamic testing." For the first time, this invention prepares sample specimens that are completely identical to the dam bag material and process during the rubber dam manufacturing stage, and deploys them in the actual service environment to ensure that the samples and dam bags are under the same operating conditions. By monitoring the performance changes of the samples over a long period of time, this invention fills the application gap of standards such as GB / T 50979 in the special seawater conditions of nuclear power plants, and provides a scientific methodological reference for the aging management of rubber dams and other rubber products.

[0058] (2) A three-tiered progressive aging status assessment system was established. This invention constructs a three-tiered progressive assessment method covering "on-site appearance quality inspection - performance testing of retained materials - structural function verification". The first tier involves visually inspecting the surface defects of the dam bag on-site or using auxiliary tools to promptly identify and repair local damage; the second tier involves periodically sampling and testing the physicochemical properties (such as tensile strength, bond strength, hardness, etc.) of the retained samples to quantitatively assess the degree of material aging; the third tier involves structural performance tests, including tensile tests with fabric strips, to verify the overall load-bearing capacity of the dam bag. This method achieves full-chain monitoring from microscopic material degradation to macroscopic structural failure, significantly improving the scientificity and accuracy of aging status assessment.

[0059] (3) This invention enables accurate prediction of aging trends and scientific formulation of maintenance plans. By using linear regression analysis or Arrhenius model fitting, the present invention performs trend analysis on the sample performance test results and establishes performance degradation curves and life prediction models. This method can predict the performance degradation trend of rubber dams approximately two years in advance, providing data support for nuclear power plant operation and maintenance personnel to formulate maintenance and replacement plans. It avoids the waste of resources caused by premature replacement and also prevents the risk of spare parts shortages and sudden failures caused by delayed replacement, demonstrating good economic efficiency and planning.

[0060] This application also provides a system for detecting the aging status of rubber dams in a nuclear power plant's cold source system, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the methods described above.

[0061] 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, free combinations of the above technical features and various modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to 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 detecting the aging status of rubber dams in a nuclear power plant's cold source system, characterized in that, The method includes the following steps: Step S1: Obtain historical rubber dam project data and perform statistical analysis to obtain sample layout data; Step S2: Place the sample at the position corresponding to the sample layout data, and periodically sample and test the sample to determine if there are any defects. If there are defects, proceed to step S3. Step S3: Repair the defect locations on the sample; Step S4: Perform material property tests on the repaired sample and / or the sample without defects to obtain the performance test results; Step S5: Perform trend analysis based on the performance test results to obtain service trend results.

2. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 1, characterized in that, In step S1, the sample layout data includes the number of samples and the sample placement location; and / or the samples include dam bags for water intake or intake. Or / and the historical rubber dam project data includes historical dam bag service life data; Step S1 includes: The number of samples was obtained by statistically analyzing the historical dam bag lifespan data. The sample placement location was determined based on the actual service environment conditions of the rubber dam. The sample placement includes evenly placing the samples in each channel, with half of the samples placed on the water-facing side wall of the rubber dam and above the historical average tide level; the other half of the samples are placed on the bottom plate of the rubber dam.

3. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 2, characterized in that, In step S1, the periodic sampling and testing of the sample to determine whether there are defects includes: The internal pressure of the dam bag is monitored to obtain internal pressure data, which is then compared with preset pressure data to determine whether the sample has defects.

4. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 1, characterized in that, In step S2, the periodic sampling and testing of the sample to determine whether there are defects includes: The outer surface of the sample is inspected under normal inflation or depressurization conditions when isolation is met. If signs of damage are found during the inspection of the outer surface, the sample is determined to be defective.

5. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 1, characterized in that, Step S3 includes: The defect location of the sample is repaired using a corresponding defect repair method; wherein the defect repair method includes at least one of the following: screw mechanical extrusion repair, tower-type emergency plug leak sealing repair, cold bonding repair, and hot vulcanization repair.

6. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 1, characterized in that, The sample includes a dam bag adhesive layer, adhesive material and coated fabric. In step S4, the performance test results include at least: appearance test results, size test results, physicochemical property test results, adhesive strength test results and tensile test results of fabric strips. Step S4 includes: The overall sample is subjected to external and dimensional inspections to obtain the appearance inspection results and the dimensional inspection results. The physicochemical properties of the rubber compound were tested, and the test results were obtained. The bonding strength test was conducted on the adhesive layer of the dam bag and the adhesive material to obtain the bonding strength test results; A tensile test of the fabric strip was conducted on the dam bag to obtain the tensile test results of the fabric strip.

7. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 6, characterized in that, The tensile test results containing the fabric strips include the warp tensile strength of the dam bag; Tensile tests were conducted on the dam bag containing fabric strips, and the results of the tensile tests on the fabric strips included: The specific weight of water, the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height, and the designed dam height are obtained. The specific weight of water, the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height, and the designed dam height are then substituted into a preset tensile strength calculation formula to obtain the warp tensile strength of the dam bag. The preset tensile strength calculation formula includes: Where T is the calculated longitudinal tensile strength of the dam bag; The specific gravity of water; H1 is the ratio of the air pressure inside the bag to the water column pressure equivalent to the dam height; H1 is the designed dam height.

8. The method for detecting the aging status of rubber dams in a nuclear power plant's cold source system according to claim 1, characterized in that, The trend analysis based on the performance test results to obtain the service trend results includes: Based on the performance test results, a linear regression analysis was performed to obtain the performance degradation trend line. And / or based on the performance test results, an Arrhenius model fitting analysis is used to obtain a lifetime prediction curve; The service trend result is determined based on the performance degradation trend line and / or the life prediction curve.

9. The method for detecting the aging status of rubber dams in nuclear power plant cold source systems according to claim 1, characterized in that, It also includes step S6: The performance test results are compared and analyzed with the preset service acceptance criteria to obtain the comparison and analysis results. The final analysis results are determined based on the comparative analysis results and the service trend results.

10. A system for detecting the aging status of rubber dams in a nuclear power plant's cold source system, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory, characterized in that the processor executes the computer program to implement the steps of the method according to any one of claims 1-9.

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