A method for evaluating the research and development of welding materials for nuclear power plants

Abstract

The present application relates to a kind of nuclear power equipment welding material research and development evaluation method, comprising: in the index library and parameter library that have been built, select conventional performance index, manufacturing stability index and acceptance test parameter as the input of welding material formula research and development, the test data corresponding to the formula corresponding welding parameter obtained by executing formula trial production to meet the index requirement;According to the welding test plate prepared according to the formula, select acceptance test parameter, welding procedure qualification parameter, welding witness document parameter and conventional performance index in the index library and parameter library as the input of welding material user evaluation test, and the qualified performance test data is obtained by completing performance test of welding test plate;Take the excess material of test plate, according to the material type, service reactor type and service working condition, select the index in the index library as the input of welding material service performance test, output service performance test data;According to all the tests described above, the test results meeting the index requirements are output as the evaluation results of welding material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear engineering, in particular to a nuclear power equipment welding material research and development evaluation method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] Welding is a key process of nuclear power equipment, and the welding material used is closely related to the engineering quality. The welding material needs to perform experiments and research according to the set indicators, and different nuclear power equipment has different performance requirements, so that the source of the indicators is uncertain.

[0004] Secondly, the welding parameters are also an important factor affecting the performance of the welding material. The general industrial field has been able to evaluate the influence of welding parameters on welding materials, but such evaluation is only limited to the case where the welding material formula is determined. The welding material in the research and development stage is more susceptible to the influence of welding parameters due to the continuous change of its own formula, resulting in unstable performance. Therefore, the welding material needs to consider multiple factors such as material formula, welding scene and equipment demand in the research and development experiment stage, so that it is difficult to objectively evaluate the performance of the welding material in the research and development stage. SUMMARY

[0005] In order to solve at least one technical problem in the background art, the present application provides a nuclear power equipment welding material research and development evaluation method to construct the evaluation method required in the research and development stage of the nuclear power equipment welding material in a process-oriented manner, and meet the current demand of nuclear power welding material.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0007] The first aspect of the present application provides a nuclear power equipment welding material research and development evaluation method, comprising the following steps:

[0008] Step 1: In the constructed indicator library and parameter library, select ZBa general performance indicators, ZBc manufacturing stability indicators and CSa acceptance test parameters as the input of the welding material formula research and development, perform the trial production of the welding material formula, obtain the test data corresponding to the formula meeting the indicator requirements and output to the performance library, and the corresponding welding parameters and output to the parameter library;

[0009] Step 2: Take the welding test plate prepared according to the formula in step 1, select CSa acceptance test parameters, CSb welding procedure qualification parameters, CSc welding witness parameters in the index library and parameter library, and the same ZBa general performance index as step 1 as the input of the welding material user evaluation test, weld the test plate and complete the performance test, obtain qualified performance test data and output the data to the performance library;

[0010] Step 3: Take the remaining material of the test plate in step 2, select the index in the ZBb service performance index sub-library from the index library according to the material type, service reactor type and service working condition as the input of the welding material service performance test, and output the service performance test data to the performance library;

[0011] Step 4: According to all the tests in steps 1-3, output the test results meeting the index requirements to the performance library, which is the evaluation result of the welding material.

[0012] The index library includes three sub-index libraries, namely ZBa general performance index, ZBb service performance index and ZBc development stability index;

[0013] The index identifier of ZBa general performance index is ZBa ij , i is a 2-bit identifier, the first bit corresponds to the source type of the index, including standard requirement index and corresponding experience requirement index, and the second bit is the serial number of the index source; j is a 2-bit identifier, the first bit is the performance index set in the nuclear power performance test, and the second bit is the data result corresponding to the performance index.

[0014] ZBb service performance index, index identifier ZBa i , i is a performance index set in the nuclear power equipment service test.

[0015] ZBc development stability index, which evaluates whether the welding material developed successfully has the ability to stably manufacture the welding material meeting the requirements on the production line. The index requires that the batch number of qualified welding material samples is not less than 3.

[0016] The parameter library includes three sub-parameters libraries, namely CSa welding material acceptance parameters, CSb welding procedure qualification parameters and CSc welding witness parameters.

[0017] The index identifiers in the parameter library are CSa i / CSb i / CSc i , i is a 2-bit identifier, the first bit is the type of the parameter, including welding test plate information, welding electrical characteristics and heat treatment mode, and the second bit is the serial number of the set parameter type.

[0018] The performance library includes two sub-index libraries, namely XNa general performance library and XNb service performance library.

[0019] The index of the XNa general performance library is XNa j j is a 2-bit identifier, the first bit corresponds to the performance index set in the ZBa general performance index library, and the second bit is the data result corresponding to the performance index. The data result is a measured value. ij

[0020] The index of the XNb special performance library is XNbj, and j corresponds to the performance index set in the ZBb special performance index library.

[0021] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0022] 1. The evaluation method required in the research and development stage of the welding material of nuclear power equipment is constructed in a process manner, different needs of the nuclear power welding material are met, and the localization production of the welding material is facilitated.

[0023] 2. In addition to the current mainstream nuclear power standard technical requirements, project requirements and performance results, the welding parameter database is established according to the characteristics of the welding material, so that the influence of the formula of the welding material itself and the welding process on the final performance is comprehensively considered.

[0024] 3. The database is formed according to the performance index, welding parameter and other data, so that it can be directly called in the research and development of the welding material, and the use mode and use rule are facilitated according to the demand of the welding material in the research and development process. DETAILED DESCRIPTION

[0025] The drawings accompanying the specification of the present application form a part of the present application and serve to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0026] Figure 1 is a welding material evaluation process flowchart provided by one or more embodiments of the present application. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with the drawings and embodiments.

[0028] It should be pointed out that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0029] ​It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] As described in the background, welding materials for nuclear power equipment need to undergo experiments and research and development according to set indicators. Some indicators come from existing standards and specifications, but each standard and specification has different focuses. At the same time, some indicators come from the performance and operating conditions requirements of nuclear power equipment, which limit the indicators that welding materials must meet in the form of technical requirements. The sources of the above indicators are uncertain, and it is difficult to coordinate the relationship between indicators from different sources.

[0031] Secondly, welding parameters are also a crucial factor affecting the performance of welding materials. Welding is a complex chemical and physical process involving multiple parameters such as the welding environment, heat treatment conditions, and test plate thickness. Numerous factors influence performance, and even minor changes in some process parameters can lead to variations in the performance data of the welded material after forming. Furthermore, differences in external conditions, such as the welding equipment and base material used in each step, also affect the final performance, making it difficult to objectively evaluate the performance of welding materials during the research and development phase.

[0032] Example 1:

[0033] like Figure 1 As shown, the purpose of this embodiment is to provide a method for the research and evaluation of welding materials for nuclear power equipment, including the following steps:

[0034] like Figure 1 As shown, it includes a process flow module and a data flow module.

[0035] Based on the characteristics of nuclear power welding material development, the process flow module breaks down the entire nuclear power welding material development and evaluation process into three key steps: formulation development and evaluation, user testing and evaluation, and service performance evaluation. Adjacent steps are logically sequential; the subsequent steps can only begin after the preceding step has been successfully completed.

[0036] The data flow module governs the data input and output flow relationships that support the normal execution of each step in the process flow. Based on the characteristics of nuclear power welding materials, this module includes three databases: an index database (referred to as the index library), a welding parameter database (referred to as the parameter library), and a performance test result database (referred to as the performance library). The index library and parameter library provide input data for each step of the process flow; this input data flow is called the input stream. The performance library summarizes the output performance data from each step of the process flow; this output data flow is called the output stream. During the execution of the input stream, there may be situations where data comes from one or more databases and multiple applicable input conditions. These data need to be processed according to their characteristics and certain rules to form the final input stream.

[0037] The indicator library contains three sub-indicator libraries: ZBa conventional performance indicators, ZBb service performance indicators, and ZBc development stability indicators. The settings for each indicator library are as follows:

[0038] ZBa's standard performance indicators are applicable to both formulation development and evaluation, and user trials and evaluation. The indicators are divided into two levels, and are labeled ZBa. ij The specific details are as follows:

[0039] The identifier 'i' is set to a 2-bit identifier, where the first bit corresponds to the source type of the indicator: 1 for standard requirement indicators and 2 for corresponding experience requirement indicators. The second bit is the sequence number of the specific indicator source.

[0040] The main examples are as follows:

[0041] 11: ASME Standard; 12: RCC Standard; 13: GB Standard; 14: NB Standard; 15: ISO Standard; ...

[0042] 21: AP1000 project; 22: CAP series projects; 23: Hualong One project; 24: Generation II Plus project; (In actual engineering, the requirements for welding materials for nuclear power equipment will vary in each project. Experience will be gained after the final nuclear power equipment is manufactured and put into use. Therefore, the project names here are only examples and should be set according to the actual situation.)

[0043] j is set as a 2-bit identifier, corresponding to the conventional performance test indicators of nuclear power plants, as shown in Table 1:

[0044] Table 1 Correspondence between Conventional Performance Test Indicators of Nuclear Power Plants

[0045]

[0046]

[0047] To meet the application requirements of main equipment of the third generation passive nuclear power plant project such as AP1000 and CAP series, the following core indicators need to be included:

[0048] Chemical composition:

[0049] Chemical composition of low alloy steel welding material: S content ≤0.010%, P content ≤0.010%;

[0050] Chemical composition of other welding materials: S content ≤0.010%.

[0051] Mechanical properties:

[0052] RT of reactor pressure vessel core area NDT ≤-30℃;

[0053] Tensile strength of stainless steel strip electrode overlay layer at room temperature ≥520MPa;

[0054] High temperature tensile strength of welding material for main pipeline ≥430MPa;

[0055] High temperature tensile strength of nickel-based alloy electrode and welding wire ≥505MPa.

[0056] The third generation nuclear power plant, which meets the requirements of the American nuclear power user requirements document (URD) and the European nuclear power user requirements document (EUR), is called the third generation nuclear power plant.

[0057] The third generation passive nuclear power plant refers to the third generation nuclear power plant which contains passive safety system, which means that the safety related alternating current power supply is not required; at least 72 hours, no operator intervention is required; under severe accident conditions, the containment has sufficient design margin; no off-site emergency plan is required.

[0058] The representative nuclear power plant of the third generation passive nuclear power plant is AP1000 and CAP series nuclear power plant.

[0059] ZBb special performance indicators are applicable to the service performance evaluation stage. Due to the small number of service performance indicators, one level is set under the indicator, and the indicator identifier is ZBa i , which is described as follows:

[0060] i is set as a 1-bit identifier, which corresponds to the commonly used service performance test indicators of nuclear power plants, as shown in Table 2:

[0061] Table 2 Correspondence of commonly used service performance test indicators of nuclear power plants

[0062]

[0063] ZBc manufacturing stability indicators

[0064] Manufacturing stability index is suitable for welding material formula research and development and evaluation stage, mainly used for evaluating whether the welding material developed successfully can be stably manufactured on the production line to meet the requirements. The index requires the number of qualified welding material sample batches, and the requirement value is not less than 3.

[0065] Parameter library contains 3 sub-parameter libraries, which are CSa welding material acceptance parameters, CSb welding welding procedure qualification parameters and CSc welding witness parameters, corresponding to 3 stages of forming performance data in the welding material use cycle.

[0066] The parameters of each sub-parameter library are relatively unified, and each sub-parameter library is provided with one level, and the index identifiers are CSa i / CSb i / CSc i . The specific description is as follows:

[0067] i is set as a 2-bit identifier, wherein the first bit corresponds to the type of the parameter, 1 for welding test plate, 2 for welding electrical characteristics, and 3 for heat treatment system. The second bit is the serial number of the specific parameter.

[0068] For example:

[0069] 11: test plate grade; 12: test plate thickness.

[0070] 21: welding current; 22: welding voltage; 23: welding speed; 24: welding heat input;

[0071] 31: post-weld heat treatment temperature; 32: post-weld heat treatment holding time; 33: post-heat treatment temperature; post-heat treatment holding time.

[0072] Performance library contains 2 sub-index libraries, which are XNa general performance library and XNb service performance library. The setting of each index library is as follows:

[0073] The level of XNa general performance library is 1, and the index identifier is XNa j . The specific description is as follows:

[0074] j is set as a 2-bit identifier, corresponding to the nuclear power commonly used general performance index in ZBa general performance index library, and the data type is according to the measured results, as shown in Table 3:

[0075] Table 3 General performance library XNa j Performance index item corresponding to j in general performance library

[0076] Serial number Performance item Data type 01 Chemical component Numerical value 02 Tensile property Numerical value 03 Impact property Numerical value 04 RT NDT ]] Numerical value 05 Diffusion hydrogen content Numerical value 06 Intergranular corrosion property Pass / fail 07 Non-destructive testing Pass / fail

[0077] The level of XNb special performance library is 1, and the index identifier is XNb j . The specific description is as follows:

[0078] j is set to 1-bit identifier, corresponding to the index in the ZBb special performance index library, the data type is specified according to the measured results, as shown in Table 4:

[0079] Table 4 Special performance library XNb j , the performance index item corresponding to j

[0080]

[0081]

[0082] The process flow module lists three core steps of nuclear power welding material research and evaluation: welding material research, user test, and service performance test, which are logically related to each other, and the subsequent research work can only be started after the previous research process is successfully completed. Each step is implemented after selecting the corresponding input conditions, and the qualified results are transferred to the next stage of work, and the performance library / parameter output data. The detailed steps are as follows:

[0083] Step 1 is the research and evaluation of welding material formula, which requires the research unit to complete the trial production of welding material formula, and the solidification process has the ability to stably manufacture multiple batches.

[0084] This step selects parameters from the index library and parameter library as the input of welding material research work. Among them, the index library selects ZBa general performance index and ZBc manufacturing stability index, and the parameter library selects CSa acceptance test parameter. ZBa general performance index and CSa acceptance test parameter are selected according to the target product of nuclear power reactor, applicable standard system and welded base material. If there are multiple applicable input data, ZBa is generally processed according to the intersection method, and CSa is generally processed according to the union method, to form the final input stream. ZBc manufacturing stability index is the required value in the previous step, and ZBc in this embodiment is not less than 3.

[0085] On the basis of complete input in the previous step, the research unit completes the trial production of welding material formula, and the solidification process has the ability to stably manufacture multiple batches. After completing these works, step 1 outputs two groups of data, one group is all qualified general performance test data, which is output to the performance library, and the other group is the obtained matching welding parameter, which is output to the parameter library. The welding parameters of the subsequent steps should be selected within the range of this group of parameters in principle, so it will be an important basis for selecting step 2 user test parameters. Then enter step 2.

[0086] Step 2 is user test and evaluation, which selects equipment manufacturers and on-site installation units as user enterprises as welding material third-party test units to verify various general performances and meet the requirements of engineering design and application.

[0087] The parameters are selected from the index library and the parameter library as the input of the welding material research and development work respectively in this step. The ZBa conventional performance index is selected from the index library, and the CSa acceptance test parameter, the CSb welding procedure qualification parameter and the CSc welding witness parameter are selected from the parameter library. The ZBa is consistent with the index in step 1 in principle. The performance test experienced by the welding material product in the user unit includes the welding material retest, the welding procedure qualification test and the welding witness test, so the welding parameters in this step need to be selected from the three sub-parameter libraries of the CSa acceptance test parameter, the CSb welding procedure qualification parameter and the CSc welding witness parameter according to the nuclear power plant type of the target product, the applicable standard system and the welded base material. If there are multiple applicable input data, the ZBa is generally processed according to the intersection method, and the CSa, the CSb and the CSc are generally processed according to the union method to form the final input stream.

[0088] On the basis of complete input in the previous step, the test plate welding and performance test required by the evaluation test are completed by the user unit. After obtaining the qualified performance test data, the step 2 outputs the conventional performance test data to the performance library. Then step 3 is entered.

[0089] Step 3 is the service performance evaluation, which completes the performance test related to the service of the nuclear power plant.

[0090] The welding test plate used in this step is taken from the test plate scrap in step 2, so it is not necessary to weld the test plate again, and only the parameters are selected from the index library as the input of the welding material research and development work, and the indexes from the ZBb service performance index sub-library are selected according to the material type, the service reactor type, the service working condition and the like. If there are multiple applicable input data, the ZBb is generally processed according to the intersection method to form the final input stream.

[0091] On the basis of complete input in the previous step, the service performance test is completed by the professional testing agency or the higher learning institution. After obtaining the qualified performance test data, the step 3 outputs the service performance test data to the performance library.

[0092] The technical work of the welding material research and evaluation is completed.

[0093] The above-mentioned mode constructs the evaluation method required in the research and development stage of the welding material of the nuclear power equipment in a flow way, and meets the current demand of the nuclear welding material.

[0094] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for evaluating a nuclear power plant welding material development, characterized by: The method comprises the following steps: Step 1: In the constructed index library and parameter library, ZBa general performance index, ZBc manufacturing stability index and CSa acceptance test parameter are selected as the input of the welding material formula research and development, the welding material formula trial production is executed, the test data corresponding to the formula meeting the index requirement are obtained and output to the performance library, and the corresponding welding parameters are output to the parameter library; Step 2: The welding test plate prepared according to the formula in step 1 is taken, the CSa acceptance test parameter, the CSb welding process evaluation parameter, the CSc welding witness parameter and the same ZBa general performance index as in step 1 are selected from the index library and the parameter library as the input of the welding material user evaluation test, the welding test plate is welded and the performance test is completed, the qualified performance test data are obtained and output to the performance library; Step 3: The remaining material of the test plate in step 2 is taken, the ZBb service performance index in the index library is selected as the input of the welding material service performance test according to the material type, the service type and the service working condition, and the service performance test data are output to the performance library; Step 4: According to all the tests in steps 1-3, the test results meeting the index requirements are output to the performance library, that is, the evaluation results of the welding material; The welding material research and development and evaluation process is divided into formula research and development and evaluation, user test and evaluation and service performance evaluation, and the adjacent steps are logically related.

2. The method of claim 1, wherein: The index library comprises three sub-indices, namely ZBa general performance index, ZBb service performance index and ZBc manufacturing stability index.

3. The method of claim 2, wherein: The index identifier of the ZBa general performance index is ZBa ij , i is a 2-bit identifier, the 1st bit corresponds to the source type of the index, including a standard requirement index and a corresponding experience requirement index, and the 2nd bit is the serial number of the index source; j is a 2-bit identifier, the 1st bit is a performance index set in a nuclear power performance test, and the 2nd bit is a data result corresponding to the performance index.

4. The method of claim 2, wherein: The ZBb service performance index, index identifier ZBb i , i is set to 1 bit identifier, corresponding to nuclear power service performance test index.

5. The method of claim 2, wherein: The ZBc manufacturing stability index evaluates whether the welding material developed successfully has the ability to stably manufacture the welding material meeting the requirements on the production line, and the index requires that the batch quantity of the qualified welding material sample is not less than 3.

6. The method for developing and evaluating a welding material for a nuclear power plant according to claim 1, characterized in that: The parameter library comprises three sub-parameters, namely CSa acceptance test parameter, CSb welding process evaluation parameter and CSc welding witness parameter.

7. The method for research and evaluation of welding materials for nuclear power equipment as described in claim 6, characterized in that: The index in the parameter library is respectively CSa i / CSb i / CSc i i is a 2-bit identifier, the first bit is the type of parameter, including welding coupon information, welding electrical characteristics and heat treatment mode, and the second bit is the type number of the set parameter.

8. The method of claim 1, wherein: the nuclear power plant welding material development and evaluation method further comprises: The performance library comprises XNa general performance library and XNb service performance library. ​ 9. The method for research and evaluation of welding materials for nuclear power equipment as described in claim 8, characterized in that: The index of the XNa routine performance library is XNa j , j is a 2-bit identifier, the first bit is one of performance items including chemical composition, tensile property, impact property, RT NDT , diffusible hydrogen content, intergranular corrosion property, nondestructive testing, corresponding to the performance index set in the ZBa routine performance index library, and the second bit is a data result corresponding to the performance index, the data result being a measured value.

10. The method of claim 8, wherein: the nuclear power plant welding material development evaluation method further comprises: determining a weldability of the welding material based on the welding material data; and determining a weldability of the welding material based on the welding material data and the welding material data. The index of the XNb service performance library is XNb j , j is one of performance items, the performance items include irradiation embrittlement performance, fracture toughness, fatigue performance, corrosion resistance performance, DDC micro-crack resistance performance, and corresponds to the set performance index in the ZBb service performance index sub-library.

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