A method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant

Abstract

The present application relates to the technical field of nuclear power plant performance testing and discloses a method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant, comprising the following steps: S1, obtaining a first sample of a reference bursting disk after a first fatigue test, obtaining a second sample of a bursting disk to be assessed, and performing a bursting test on the first and second samples to obtain a life coefficient; S2, performing a non-metallic material state test on non-metallic debris in the first and second samples after the test, obtaining non-metallic test results of similar non-metallic materials, and obtaining a first remaining life of the bursting disk to be assessed; S3, performing a metallic material state test on metallic debris in the first and second samples after the test to obtain a second remaining life of the bursting disk to be assessed; S4, obtaining a third sample of the bursting disk to be assessed, and performing a second fatigue test to obtain a third remaining life of the bursting disk to be assessed; and S5, obtaining a final remaining life of the bursting disk to be assessed based on the life coefficient, the first, second, and third remaining lives.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power plant performance testing, and more specifically, to a method for evaluating the remaining life of a rupture membrane of a large-caliber vacuum system in a nuclear power plant. Background Art

[0002] Bursting discs are safety devices used in pressure vessels, pressure piping, or other sealed, pressure-bearing equipment to prevent overpressure or excessive vacuum. Currently, nuclear power plant steam turbine units often use bursting discs to protect the cylinders, condensers, and steam separator reheaters (MSRs), preventing significant damage from overpressure. The number of bursting discs is typically determined based on the needs of the plant. For example, each main steam turbine unit in a nuclear power plant has three low-pressure cylinders, each with four bursting discs. Each small steam turbine in each steam-driven feedwater pump system has one bursting disc, and each unit's GSS system MSR is equipped with eight bursting discs.

[0003] Bursting discs, as safety devices protecting critical equipment, are managed as CCM devices in power plants. Their bursting pressure (operating pressure) must be maintained within system design requirements. Excessively high bursting pressures can cause significant equipment damage under abnormal or accidental operating conditions; while excessively low bursting pressures can disrupt the equipment's normal operating environment under normal or variable operating conditions. Due to the irreversibility of bursting discs, abnormal bursts necessitate plant shutdown and processing. Furthermore, steam turbine bursting discs are connected to the condenser, and a burst could disrupt the condenser's vacuum, leading to plant shutdown and reactor downtime.

[0004] Bursting disks are general-purpose products with a wide range of applications. Equipment manufacturers typically use the mean time between failures (MTBF) for the worst operating environment when developing user-guided maintenance plans. However, for relatively stable operating environments like nuclear power plant vacuum systems, these recommended maintenance strategies are overly conservative, resulting in a significant waste of spare parts and unnecessary human resources during actual use. There is currently a lack of effective analysis and evaluation methods for developing reasonable maintenance strategies for large-diameter bursting disks used in nuclear power plant vacuum environments.

[0005] Furthermore, large-diameter vacuum bursting disks are currently primarily imported, resulting in relatively high prices, long production and delivery cycles, and difficulty in stocking spare parts. The original manufacturer's recommended replacement cycle, based on typical bursting disk usage, is only three years (equivalent to a 2C refueling cycle). However, nuclear power plant unit operations are characterized by stable operating conditions for the vast majority of a refueling cycle, and the operating environment for these large-diameter bursting disks is relatively stable. Due to the large volume of the vacuum environment, there are no sudden pressure fluctuations, resulting in a stable operating environment throughout the entire lifecycle. Theoretically, qualitative analysis indicates that the lifespan of the bursting disk is consumed throughout its entire lifecycle, and visual inspection of the replaced disks indicates good condition. Qualitative judgment: Currently, large-diameter vacuum bursting disks have some potential for extended operation. However, there is currently no test, analysis and evaluation method for the remaining life of old bursting membranes at home and abroad; life testing is very time-consuming, especially for the test of vacuum bursting membranes. The vacuuming method is used to simulate the actual use process. Since the vacuuming time itself is long, additional vacuuming equipment is required. The overall test process is resource-consuming, manpower-consuming and time-consuming, and has poor operability. Summary of the Invention

[0006] The technical problem to be solved by the present application is to provide a method for evaluating the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant.

[0007] The technical solution adopted by this application to solve the technical problem is to construct a method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant, including:

[0008] S1. Obtain a reference bursting disk and perform a first fatigue test to obtain a first sample. Obtain a bursting disk sample to be evaluated as a second sample. Perform bursting tests on the first sample and the second sample and obtain a life coefficient based on the test results.

[0009] S2. Performing a non-metallic material state test on the non-metallic debris in the first sample after the test to obtain a first non-metallic test result, performing a non-metallic material state test on the non-metallic debris in the second sample after the test to obtain a second non-metallic test result, and obtaining a third non-metallic test result for the same type of non-metallic material; and obtaining a first remaining life of the bursting disk to be evaluated based on the first non-metallic test result, the second non-metallic test result, and the third non-metallic test result;

[0010] S3. Performing a metal material state test on the metal fragments in the first sample after the test to obtain a first metal test result, performing a metal material state test on the metal fragments in the second sample after the test to obtain a second metal test result, and obtaining a second remaining life of the bursting disk to be evaluated based on the first metal test result and the second metal test result;

[0011] S4. Obtaining a third sample of the bursting disk to be evaluated, performing a second fatigue test on the third sample, and obtaining a third remaining life of the bursting disk to be evaluated based on the second fatigue test;

[0012] S5. Obtain a final remaining life of the bursting disk to be evaluated based on the life coefficient, the first remaining life, the second remaining life, and the third remaining life.

[0013] Preferably, in the method for assessing the remaining life of a bursting disk of a large-caliber vacuum system in a nuclear power plant described in the present application, in step S1 , the reference bursting disk includes an original factory bursting disk sample.

[0014] Preferably, in the method for assessing the remaining life of a bursting disk of a large-caliber vacuum system in a nuclear power plant described in the present application, in step S2, the non-metallic material state detection includes:

[0015] Performing a condition evaluation on the non-metallic debris through a Shore hardness test, a tensile test, and an oxidation induction temperature test to obtain a condition evaluation result of the non-metallic debris;

[0016] Based on the state evaluation results, DSC thermal analysis is performed to obtain an aging life equation of the non-metallic debris.

[0017] Preferably, in the method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant described in the present application, in step S3, the metal material state detection includes:

[0018] The metal fragments are subjected to metal material microstructure analysis, material visual inspection, PT inspection, damage analysis, yield strength and tensile strength testing in sequence to obtain the test results of the metal fragments.

[0019] Preferably, in the method for assessing the remaining life of a bursting disk of a large-caliber vacuum system in a nuclear power plant described in the present application, in step S1, obtaining a reference bursting disk and performing a first fatigue test to obtain a first sample comprises:

[0020] The reference bursting disk is subjected to a preset number of fatigue cycles so that the first sample can continue to serve for a preset period of time equivalent to the reference bursting disk.

[0021] Preferably, in the method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant described in the present application, the preset time length is 4 refueling cycles.

[0022] Preferably, in the method for assessing the remaining life of a bursting disk of a large-caliber vacuum system in a nuclear power plant described in the present application, in step S1, obtaining the life coefficient according to the test results comprises:

[0023] Obtaining a first test result corresponding to the first sample and a second test result corresponding to the second sample;

[0024] When both the first test result and the second test result meet a preset condition, the life coefficient is set to a first preset value; otherwise, the life coefficient is set to a second preset value.

[0025] Preferably, the method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant described in the present application is characterized in that the first preset value is 1 and the second preset value is zero.

[0026] Preferably, in the method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant described in the present application, in step S5, obtaining the final remaining life of the bursting disk to be assessed based on the life coefficient, the first remaining life, the second remaining life, and the third remaining life includes: obtaining the final remaining life based on the following formula:

[0027] F = α × Min(f1, f2, f3)

[0028] Wherein, F is the final remaining life, α is the life coefficient, f1 is the first remaining life, f2 is the second remaining life, and f3 is the third remaining life.

[0029] Preferably, in the method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant described in the present application, the second fatigue test cycle is the same as the first fatigue test cycle.

[0030] The implementation of the present invention provides a method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant, which has the following beneficial effects: extending the maintenance period of the bursting disk and significantly reducing the cost of spare parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 This is a flow chart of an embodiment of a method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to the present application. DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of this application, the specific implementation methods of this application are now described in detail with reference to the accompanying drawings.

[0034] like Figure 1 As shown, in a first embodiment of the present invention, a method for assessing the remaining life of a bursting disk in a large-diameter vacuum system of a nuclear power plant includes the following steps: S1. Obtaining a reference bursting disk and subjecting it to a first fatigue test to obtain a first sample; obtaining a bursting disk sample to be assessed as a second sample; subjecting the first and second samples to burst tests, and obtaining a life coefficient based on the test results. Specifically, obtaining a bursting disk that meets the requirements as a reference bursting disk; subjecting the reference bursting disk to a first fatigue test. The purpose of this fatigue test is to accelerate aging of the reference bursting disk; by controlling the fatigue test cycle sequence, the degree of aging of the reference bursting disk can be controlled, ultimately obtaining the desired first sample. The bursting disk sample to be assessed is used as the second sample. The first and second samples are subjected to the same burst test, and the test results are verified after each test. The life coefficient of the bursting disk is obtained based on the test results. The first and second samples can be subjected to burst tests simultaneously or separately, as long as the test conditions for the first and second samples are identical. In one embodiment, the bursting test conditions are selected based on design values. Taking the low-pressure cylinder and APP bursting disk as an example, the test conditions are as follows:

[0035] Test medium Compressed air Test temperature 120℃ Low-pressure cylinder bursting disk 1.345±15%bar.a@120℃ APP bursting membrane 0.54±15% bar.g@120℃

[0036] S2. Perform a non-metallic material status test on the non-metallic debris in the first sample after the test to obtain a first non-metallic test result. Perform a non-metallic material status test on the non-metallic debris in the second sample after the test to obtain a second non-metallic test result. A third non-metallic test result for the same type of non-metallic material is obtained. A first remaining life of the bursting disk to be evaluated is obtained based on the first, second, and third non-metallic test results. Specifically, post-test tests are performed on the first and second samples after the test. Based on the structure and corresponding material of the bursting disk, the non-metallic material in the samples can be tested. The non-metallic material, i.e., the non-metallic debris, in the first sample is tested to obtain the corresponding first non-metallic test result. The non-metallic material in the second sample after the test is similarly tested to obtain the corresponding second non-metallic test result. Furthermore, similar non-metallic materials are tested to obtain a third non-metallic test result. Similar non-metallic materials are the same non-metallic materials as those in the first and second samples and are the original non-metallic materials used. During the process of obtaining non-metallic materials in the samples, non-metallic materials from the same locations are used as much as possible for testing. In other words, it can be understood that the non-metallic material of the same type has the same non-metallic material state as the first sample before the blasting test. The non-metallic material detection process can employ the currently commonly used metal material state detection process. Based on the non-metallic state detection results, a first remaining life of the bursting disc to be evaluated can be further determined.

[0037] S3. Perform a metal material condition test on the metal fragments in the first sample after the test to obtain a first metal detection result; perform a metal material condition test on the metal fragments in the second sample after the test to obtain a second metal detection result; and obtain a second remaining life of the bursting disk to be evaluated based on the first and second metal detection results. Specifically, perform a metal material condition test on each of the first and second samples after the test. The test process can be performed on non-metallic fragments of the same structure in the first and second samples. The second remaining life of the bursting disk to be evaluated is obtained based on the obtained test results.

[0038] S4. A third sample of the bursting disc to be evaluated is obtained as a third sample, and a second fatigue test is performed on the third sample. Based on the second fatigue test, a third remaining life of the bursting disc to be evaluated is obtained. Specifically, the bursting disc sample to be evaluated before the test is used as the third sample, and it is understood that the sample conditions corresponding to the first and third samples are the same. A second fatigue test is performed on the third sample, and fatigue test results are obtained after the fatigue test. Based on these fatigue test results, a third remaining life of the bursting disc to be evaluated is obtained. Life equivalence is performed based on the fatigue test information. For example, in one specific embodiment, the fatigue test simulates the stress state of the expansion joint by applying reverse pressure from the outside (the expansion joint is actually subjected to negative pressure internally), with a pressure of 1 bar. One test process includes pressure increase, pressure hold, pressure reduction, and a pressure hold of 0 bar. The fatigue test is performed 100 times continuously. These 100 tests are equivalent to four cycles of field pressure fluctuations, i.e., four cycles of life. The fatigue test process and fatigue test evaluation results are used to obtain an equivalent life, which is then used to evaluate the third remaining life.

[0039] S5. Obtain a final remaining life of the bursting disc to be evaluated based on the life coefficient, the first remaining life, the second remaining life, and the third remaining life. Specifically, an evaluation function for evaluating the bursting disc is established based on the obtained life coefficient, the first remaining life, the second remaining life, and the third remaining life. The final remaining life of the bursting disc to be evaluated is ultimately obtained based on the evaluation function, and the final remaining life is used as a criterion for determining whether the bursting disc sample to be evaluated can continue to be used.

[0040] Optionally, in the method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant of the present application, in step S1, the reference bursting disk comprises an original factory bursting disk sample. Specifically, to ensure the accuracy of the test results, a fatigue test is performed on the original factory bursting disk sample to obtain a first sample.

[0041] Optionally, in a method for assessing the remaining life of a bursting disk in a large-caliber vacuum system of a nuclear power plant according to the present application, in step S2, the non-metallic material condition testing includes: evaluating the condition of the non-metallic debris through Shore hardness testing, tensile testing, and oxidation-induced temperature testing to obtain a condition evaluation result; and performing DSC thermal analysis based on the condition evaluation result to obtain an aging life equation for the non-metallic debris. Specifically, in one embodiment, the non-metallic material aging testing and assessment includes evaluating the condition of the bursting disk's non-metallic fluoroplastic and assessing its life. The material condition assessment primarily involves conducting dimensional inspection, Shore hardness testing, tensile testing, and oxidation-induced temperature testing on the bursting disk FEP film (fluorinated ethylene propylene copolymer film), thereby determining the state changes of the FEP film during the bursting disk's service life. The life assessment uses the material's elongation at break dropping to 50% of its initial value as the end-of-life criterion. A single-temperature accelerated thermal aging test is performed on the material, and the elongation at break trend is monitored to determine the sample's aging life at a specific temperature. Dimensional Inspection: Dimensional inspection was performed using a thickness gauge, with results accurate to 0.1mm. Five points were tested, and the arithmetic mean was taken. Material Confirmation: Testing was performed in accordance with GB / T 6040-2019, "General Rules for Infrared Spectroscopic Analysis Methods." The testing equipment used was a Nicolet 6700 Fourier Transform Infrared Spectrometer. The measured results indicated consistent surface materials. Shore Hardness Test: Shore hardness testing was performed on multiple locations of the post-test sample. Shore hardness (A) was measured in accordance with GB / T 2411-2008, "Plastics and Ebonite - Determination of Indentation Hardness (Shore Hardness) Using a Durometer." The test equipment used was a multi-function Shore durometer. If the sample thickness did not meet the test requirements, multiple layers were stacked to achieve a measurable thickness for testing. Tensile Test: The tensile strength and elongation at break were measured in accordance with GB / T 1040-2006, "Plastics - Determination of Tensile Properties - Part 3: Test Conditions for Film and Sheeting." The test equipment used was an electronic universal testing machine. The tensile data show that the tensile performance of the diaphragm, which has been in field operation for 6 years and has not undergone fatigue testing, has not declined, and the performance of the lower diaphragm remains even better. The fatigue test may have a certain degree of impact on the tensile performance of the diaphragm, but the tensile strength is also within the normal range.

[0042] The lifespan assessment of non-metallic materials used in low-pressure cylinder bursting discs utilizes a rapid activation energy assessment method. The Arrhenius equation was used to derive a lifespan equation reflecting the thermal aging characteristics of polymer materials (Equation 1). DSC thermal analysis was used to rapidly determine the activation energy, a reaction kinetic parameter of the insulating material. Combined with a single-temperature accelerated thermal aging test, the thermal aging lifespan equation (Equation 1) was determined for the material and the remaining lifespan of the rubber material was calculated. The aging test was conducted in accordance with GB / T 3512-2014, "Hot Air Accelerated Aging and Heat Resistance Tests for Vulcanized Rubber or Thermoplastic Rubber."

[0043] lgτ=a+b / T (1) Where τ is the material life, h; T is the aging temperature, K; α is a constant reflecting the specified failure performance of the material; b is numerically equal to 0.401E a / R(R=8.314J·mol -1 ·K -1 ), which is related to the activation energy E α The first remaining life of the bursting disk to be evaluated can be obtained according to the material life. In one embodiment, the material life is directly used as the first remaining life of the bursting disk to be evaluated.

[0044] Furthermore, the activation energy of the non-metallic material of the low-pressure cylinder bursting disc, calculated from DSC test results, reached 1,402,322.38 J / mol. This allows the parameter b in the thermal aging life equation in Equation 1 to be calculated as 67,636.67. The relatively high activation energy of the material, as measured by the DCS test results, qualitatively demonstrates its high stability and minimal impact on its lifespan when used below its melting point.

[0045] Optionally, in the method for assessing the remaining life of a bursting disk in a large-diameter vacuum system of a nuclear power plant of the present application, in step S3, the metal material condition detection includes sequentially performing metal material microstructure analysis, visual inspection, PT inspection, damage analysis, and yield strength and tensile strength testing on the metal fragments to obtain the metal fragment detection results. Specifically, a bursting disk model is obtained by performing a three-dimensional scan of the bursting disk and inverse modeling. Finite element analysis is performed based on the three-dimensional model. When subjected to positive pressure, stress concentrations occur at the upper and lower openings and the center of the line connecting the openings. When subjected to negative pressure, stress concentrations occur at the upper and lower openings. Based on the finite element analysis results, the bursting disk metal material test samples are primarily selected from these stress concentration locations. Microstructure comparison and analysis are performed on different locations on the bursting disk surface before and after fatigue testing using a metallographic microscope. A quality inspection of the bursting disk surface is performed before and after fatigue testing based on visual inspection and penetrant (PT) inspection to check for deformation or other defects. The inspection results are recorded, and the defects are analyzed to determine whether they are remnants of original manufacturing or caused by long-term operation. Before and after fatigue testing, PT testing was performed on the openings in the dome to detect cracks and other defects that could affect the performance of the membrane. Damage analysis identified potential wear, microcracks, and cracking in the spot welds caused by repeated loading and unloading during service. Scanning electron microscopy was used to observe and compare the damage. Scanning electron microscopy was performed on the sampled locations to compare scratches, damage, microcracks, and cracking in the welds at different locations before and after fatigue testing. Mechanical performance testing was used to determine the changes in the macroscopic mechanical properties of the metal material before and after fatigue testing. The primary focus was on testing macroscopic mechanical parameters such as yield strength and tensile strength. Because the membrane's thickness was too low to meet the testing requirements of standard specimens, conventional standard specimens were unable to obtain these macroscopic mechanical parameters. Therefore, tensile testing of the material was performed using thin-sheet tensile and indentation methods. Based on all the above conditions, the test results indicate that the metal material life has not significantly changed during the equipment's service life. This indicates that the second remaining life of the device under evaluation is very long and within a safe threshold. Using this threshold as the second remaining life, normal operation will not affect the life of the bursting disc. The metal material's performance has not significantly changed after service, making it a non-critical factor affecting the performance of the bursting disc. It can be assumed that the metal component's life is in excess of 10 years. This safety threshold is used.

[0046] Optionally, in the method for assessing the remaining life of a bursting disk in a large-diameter vacuum system of a nuclear power plant of the present application, in step S1, obtaining a reference bursting disk and subjecting it to a first fatigue test to obtain a first sample includes subjecting the reference bursting disk to a preset number of fatigue cycles so that the first sample is equivalent to the reference bursting disk after a preset service life. Specifically, a conservative number of fatigue cycles is set to achieve an equivalent aging state after the bursting disk has been in service for the preset service life. The preset service life can be set based on the refueling cycle. Based on practical applications, the preset service life is set to four refueling cycles of a nuclear power plant. In one embodiment, the process for obtaining the third sample through the second fatigue test is the same as that for obtaining the first sample, i.e., the first and second fatigue tests are the same. The current refueling cycle is two cycles. Due to power plant requirements, the equipment service life cannot be extended too long all at once, and the test cannot fully simulate field operating conditions. Therefore, the preset extension time is four cycles. Subsequent optimization can be performed based on the operational performance of the four cycles. A refueling cycle refers to the time between reactor refueling and the time from one overhaul to the next. Four cycles refers to four overhauls.

[0047] Optionally, in a method for assessing the remaining life of a bursting disk in a large-diameter vacuum system of a nuclear power plant according to the present application, in step S1, obtaining a life coefficient based on test results includes: obtaining a first test result corresponding to the first sample and a second test result corresponding to the second sample; if both the first test result and the second test result meet a preset condition, setting the life coefficient to a first preset value; otherwise, setting the life coefficient to a second preset value. Specifically, the method analyzes the post-test results of the bursting test on the first and second samples. If both test results meet the preset condition, the bursting test result life coefficient α is obtained as the first preset value; otherwise, if either test result fails to meet the preset condition, the bursting test result life coefficient α is obtained as the second preset value, which is determined by the original design requirements. In one embodiment, the first preset value is set to 1, and the second preset value is set to zero.

[0048] The original design requirements refer to the requirements of the system design manual. The equipment is selected according to the design manual. The design bursting parameters of the bursting membrane are as follows: low-pressure cylinder bursting membrane: 1.345±15% bar.a@120℃, APP bursting membrane: 0.54±15% bar.g@120℃. Among them, the bursting parameters of these two bursting membranes are close. Note that the units are different. The low-pressure cylinder bursting membrane can also be written as 0.345±15% bar.g@120℃.

[0049] Optionally, in step S5, obtaining the final remaining life of the bursting disk to be evaluated based on the life coefficient, the first remaining life, the second remaining life, and the third remaining life includes: obtaining the final remaining life based on the following formula:

[0050] F = α × Min(f1, f2, f3)

[0051] Wherein, F is the final remaining life, α is the life coefficient, f1 is the first remaining life, f2 is the second remaining life, and f3 is the third remaining life. The process of obtaining the final remaining life based on the three remaining lives can be obtained based on the above formula.

[0052] Through the above process, the remaining effective life data of large-diameter bursting membranes after use in the established maintenance cycle under the vacuum environment of the power station can be determined in a targeted manner; the effective life data determined by testing, analyzing and evaluating can be used to determine a reasonable maintenance cycle extension plan for large-diameter bursting membranes in a targeted manner.

[0053] It can be understood that the above embodiments only express the preferred implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above technical features can be freely combined, and several deformations and improvements can be made, which all fall within the scope of protection of the present application. Therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of coverage of the claims of the present application.

Claims

1. A method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant, characterized in that: include: S1. Obtain a reference bursting disk and perform a first fatigue test to obtain a first sample. Obtain a bursting disk sample to be evaluated as a second sample. Perform bursting tests on the first sample and the second sample and obtain a life coefficient based on the test results. S2. Performing a non-metallic material state test on the non-metallic debris in the first sample after the test to obtain a first non-metallic test result, performing a non-metallic material state test on the non-metallic debris in the second sample after the test to obtain a second non-metallic test result, and obtaining a third non-metallic test result for the same type of non-metallic material; and obtaining a first remaining life of the bursting disk to be evaluated based on the first non-metallic test result, the second non-metallic test result, and the third non-metallic test result; S3. Performing a metal material state test on the metal fragments in the first sample after the test to obtain a first metal test result, performing a metal material state test on the metal fragments in the second sample after the test to obtain a second metal test result, and obtaining a second remaining life of the bursting disk to be evaluated based on the first metal test result and the second metal test result; S4. Obtaining a third sample of the bursting disk to be evaluated, performing a second fatigue test on the third sample, and obtaining a third remaining life of the bursting disk to be evaluated based on the second fatigue test; S5. Obtain a final remaining life of the bursting disk to be evaluated based on the life coefficient, the first remaining life, the second remaining life, and the third remaining life; the final remaining life is obtained based on the following formula: , where F is the final remaining life, is the life coefficient, is the first remaining life, is the second remaining life, is the third remaining lifespan; Wherein, in the step S2, the non-metallic material state detection includes: performing a state evaluation on the non-metallic debris through a Shore hardness test, a tensile test, and an oxidation induction temperature test to obtain a state evaluation result of the non-metallic debris; performing a DSC thermal analysis based on the state evaluation result to obtain an aging life equation for the non-metallic debris; obtaining a remaining life of the rubber material according to the thermal aging life equation, and directly using the remaining life of the rubber material as the first remaining life of the bursting membrane to be evaluated; In step S3, the metal material status detection includes: performing metal material microstructure analysis, material visual inspection, PT inspection, damage analysis, yield strength and tensile strength testing on the metal fragments in sequence to obtain the detection results of the metal fragments. According to the detection results, when the life of the metal material does not change significantly during the service life of the equipment, a safety threshold is used as the second remaining life.

2. The method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to claim 1, characterized in that: In step S1 , the reference bursting disc includes an original factory bursting disc sample.

3. The method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to claim 1, characterized in that: In the step S1, obtaining a reference bursting disk and performing a first fatigue test to obtain a first sample includes: The reference bursting disk is subjected to a preset number of fatigue cycles so that the first sample can continue to serve for a preset period of time equivalent to the reference bursting disk.

4. The method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to claim 3, characterized in that: The preset duration is 4 material change cycles.

5. The method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to claim 1, characterized in that: In the step S1, the life coefficient is obtained according to the test results; including: Obtaining a first test result corresponding to the first sample and a second test result corresponding to the second sample; When both the first test result and the second test result meet a preset condition, the life coefficient is set to a first preset value; otherwise, the life coefficient is set to a second preset value.

6. The method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to claim 5, characterized in that: The first preset value is 1, and the second preset value is zero.

7. The method for assessing the remaining life of a rupture disk in a large-caliber vacuum system of a nuclear power plant according to claim 1, characterized in that: The second fatigue test has the same cycle as the first fatigue test.

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