Nuclear power plant mechanical integrated margin balance analysis system and method

Abstract

The invention relates to a mechanical integrated margin balance analysis system and method for a nuclear power plant. Each module in the system is configured as follows: a CAD software module performs modeling on a nuclear power plant structure to generate a nuclear power plant structure model; the CAD / CAE integrated tool module generates a standard nuclear power plant structure model according to the nuclear power plant structure model; the CAE software module preprocesses the standard nuclear power plant structure model to generate a nuclear power plant structure finite element model; the finite element analysis software module generates a nuclear power plant structure super-element finite element model according to the nuclear power plant structure finite element model, and performs super-element solution and time history analysis to generate a nuclear power plant structure time history result file; and the product life cycle management software module performs time-history-to-spectrum processing, stress solving and stress result analysis on the nuclear power plant structure time-history result file to obtain a nuclear power plant analysis result. The accuracy and efficiency of nuclear power plant anti-seismic performance analysis can be improved.

Description

Technical Field

[0001] The present invention mainly relates to the field of nuclear engineering safety technology, and in particular to a mechanically integrated margin balance analysis system and method for a nuclear power plant. Background Art

[0002] Mechanical margin balance analysis is an important means to evaluate the seismic performance of nuclear power plants. In the seismic analysis process of nuclear power plants, the overall model is usually built first, and the floor response spectrum is calculated based on this, and then the seismic performance of each item is analyzed according to the floor response spectrum. However, in the overall modeling process, due to the limitation of the solution scale of the existing finite element software, simplification is required in the modeling process. For example, for large and complex structures such as civil structure plants, finite element simulation can usually be performed according to the actual situation, but for some large equipment, pipelines and other items, coupling modeling is performed by simplifying the rod model. For the scattered steel structures inside the plant and a large number of equipment and pipeline items, they are simplified by mass points.

[0003] In the process of seismic analysis, a simplified processing method is adopted, and a large number of items only contribute to the calculation results in terms of mass, while the corresponding item stiffness, damping effect and its own dynamic characteristics are not reflected at all. The coupling effect between each item and the plant structure is not fully utilized, resulting in the entire seismic analysis results being too conservative. The existing seismic analysis method requires staff to manually switch to use various software processing models, and although the simplified processing method reduces the overall calculation complexity to a certain extent, it will reduce the accuracy and efficiency of the seismic performance analysis of nuclear power plants. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a nuclear power plant mechanical integration margin balance analysis system and method, which can improve the accuracy and efficiency of the seismic performance analysis of the nuclear power plant.

[0005] The technical solution adopted by the present application to solve the above-mentioned technical problems is a nuclear power plant mechanical integrated margin balance analysis system, including: a CAD software module, a CAD / CAE integrated tool module, a CAE software module, a finite element analysis software module, and a product life cycle management software module, wherein each module is configured as follows: the CAD software module models the nuclear power plant structure and generates a nuclear power plant structure model; the CAD / CAE integrated tool module generates a standard nuclear power plant structure model based on the nuclear power plant structure model; the CAE software module performs pre-processing on the standard nuclear power plant structure model and generates a nuclear power plant structure finite element model; the finite element analysis software module generates a nuclear power plant structure super-unit finite element model based on the nuclear power plant structure finite element model, performs super-unit solution and time-history analysis on the nuclear power plant structure super-unit finite element model, and generates a nuclear power plant structure time-history result file; the product life cycle management software module performs time-history conversion processing on the nuclear power plant structure time-history result file to generate nuclear power plant structure response spectrum data; stress solution and stress result analysis are performed on the nuclear power plant structure response spectrum data to obtain nuclear power plant analysis results.

[0006] In one embodiment of the present application, the nuclear power plant structure includes: one or any combination of components, equipment, systems, buildings, and pipelines; the CAD / CAE integrated tool module includes Siemens NX; the CAE software module includes SimCenter3D; the finite element analysis software module includes NASTRAN; and the product lifecycle management software module includes Teamcenter.

[0007] In one embodiment of the present application, the steps of generating a standard nuclear power plant structural model based on the nuclear power plant structural model by the CAD / CAE integrated tool module include: parsing the component configuration table and material configuration table of the nuclear power plant structure to obtain configuration information; obtaining the attribute information of the nuclear power plant structural model; wherein the attribute information includes boundary condition attributes, mesh attributes, and feature attributes; assembling the overall model according to the configuration information and attribute information to generate a standard nuclear power plant structural model; wherein the format of the standard nuclear power plant structural model includes .step and / or .xt.

[0008] In one embodiment of the present application, the configuration information includes: component type, material, grid unit type, grid size, thickness, one or any combination of simplification schemes; wherein the simplification scheme includes a simplified model and a non-simplified model, the non-simplified model represents 3D grid division, the simplified model represents simplifying the model into a mid-surface and performing 2D grid division, each surface of the simplified model is saved as a feature object or a component object, grids are divided for different surfaces or entities according to different objects, and boundary conditions are set for different objects; boundary condition attributes include: one or any combination of fixed constraint surfaces, fixed constraint points, pressure surfaces, force surfaces, and force points; grid attributes include: grid size and thickness of surfaces or bodies; feature attributes include identifiable features, and identifiable features include: one or any combination of connecting pipes, mass points, bolts, surface connection features, and containers.

[0009] In one embodiment of the present application, the CAD / CAE integrated tool module includes: a component tool for allowing users to set up parsed component configuration tables and material configuration tables, and generate corresponding attributes on corresponding component entities; wherein the material configuration table includes temperature and mechanical parameters; a feature attribute tool for allowing users to set up feature configuration tables and material configuration tables, and generate corresponding attributes on corresponding components and / or surfaces; an attribute viewing tool for allowing users to view all attributes in the model, including component attributes and feature attributes; a stress linearization tool for allowing users to select starting and end points, and create corresponding lines in expressions.

[0010] In one embodiment of the present application, the steps of pre-processing the standard nuclear power plant structure model by the CAE software module include: inheriting the attributes on the CAD surface to the CAE surface, reading the mesh attributes of CAEFace and CAEBody from the standard nuclear power plant structure model; meshing according to the mesh attributes, and if hard points are found during the meshing process, the hard points are created first and then meshing is performed; and corresponding boundary conditions are created according to the boundary attributes of CADFace and CAEBody on the CAD surface.

[0011] In one embodiment of the present application, a finite element analysis software module performs super-element solution and time-history analysis on a nuclear power plant structure super-element finite element model, and the steps of generating a nuclear power plant structure time-history result file include: calling a finite element solver to perform super-element solution on the nuclear power plant structure super-element finite element model to obtain a nuclear power plant structure super-element model binary file; setting an automatic association relationship between all nuclear power plant structure finite element models to establish an integrated finite element model of the nuclear power plant; calling a finite element solver to perform time-history analysis on the nuclear power plant structure super-element model binary file and the nuclear power plant integrated finite element model, thereby generating a nuclear power plant structure time-history result file; wherein the format of the nuclear power plant structure time-history result file is HDF5.

[0012] In one embodiment of the present application, the product lifecycle management software module performs time-to-spectrum processing on the nuclear power plant structure time-history result file, and the step of generating nuclear power plant structure response spectrum data further includes: calling the time-to-spectrum calculation program of the finite element solver to perform time-to-spectrum processing on the nuclear power plant structure time-history result file, thereby generating response spectrum data of floors, equipment, and pipelines.

[0013] In one embodiment of the present application, a product lifecycle management software module performs stress solving and stress result analysis on the structural response spectrum data of a nuclear power plant, and the step of obtaining the analysis result of the nuclear power plant includes: performing stress solving on the structural response spectrum data of the nuclear power plant to generate a structural stress result file of the nuclear power plant; wherein, in the process of stress solving, for the uncertainty of the load direction of the pipeline, the positive sign and the negative sign are calculated respectively, and a single connecting pipe load is calculated at most a preset number of times; if the result stress linearization is required, the line information is read and the corresponding node coordinates are found for line drawing calculation; stress result analysis and evaluation are performed on the structural stress result file of the nuclear power plant according to preset evaluation criteria, thereby obtaining the analysis result of the nuclear power plant; wherein the analysis result of the nuclear power plant includes the seismic analysis result of the overall plant level and / or the seismic analysis result of a single component.

[0014] In order to solve the above-mentioned technical problems, the present application also proposes a nuclear power plant mechanical integrated margin balance analysis method, which uses the above-mentioned nuclear power plant mechanical integrated margin balance analysis system, including: modeling the nuclear power plant structure to generate a nuclear power plant structural model; generating a standard nuclear power plant structural model based on the nuclear power plant structural model; pre-processing the standard nuclear power plant structural model to generate a nuclear power plant structural finite element model; generating a nuclear power plant structural super-unit finite element model based on the nuclear power plant structural finite element model, performing super-unit solution and time-history analysis on the nuclear power plant structural super-unit finite element model, and generating a nuclear power plant structural time-history result file; performing time-history conversion spectrum processing on the nuclear power plant structural time-history result file to generate nuclear power plant structural response spectrum data; performing stress solution and stress result analysis on the nuclear power plant structural response spectrum data to obtain the nuclear power plant analysis results.

[0015] The technical solution of the present application designs nuclear power plant structures such as major components of nuclear power plant buildings, a large number of equipment, piping systems and civil engineering buildings through a CAD software module to generate a CAD model of the nuclear power plant structure; the CAD model is seamlessly converted into a standard nuclear power plant structure model required by the CAE software through a CAD / CAE integrated tool module, thereby avoiding manual re-modeling in the CAE software and improving work efficiency; the CAE software module can generate a finite element model of the nuclear power plant structure, and the finite element analysis software module and the product life cycle management software module are used to perform super-element solution, time history analysis, and time history spectrum conversion on the finite element model to generate response spectrum data of the nuclear power plant structure, and the analysis results of the nuclear power plant can be obtained after stress solution and stress result analysis.

[0016] The product lifecycle management software module of this application can be built based on Teamcenter. By building a nuclear power plant mechanical integrated margin balance analysis system on the Teamcenter platform, the seismic performance of the nuclear power plant can be quickly analyzed and evaluated, and the plant structure can be iteratively optimized without using simplified processing methods. The system integrates CAD software and CAE software, optimizes the traditional manual modeling and analysis process, and transforms the originally scattered overall modeling, calculation of floor response spectra and analysis of various physical surfaces and floor spectra into an integrated and efficient analysis system, thereby achieving seamless association between design and simulation and rapid iteration of analysis and optimization. This application can not only reduce the risks caused by human operation during finite element modeling, but also improve the accuracy and efficiency of seismic performance analysis of nuclear power plants, providing strong support for the design and safety assessment of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 is a schematic diagram of a mechanically integrated margin balance analysis system for a nuclear power plant according to an embodiment of the present application;

[0019] Figure 2 It is a flow chart of a nuclear power plant mechanical integration margin balance analysis system in an embodiment of the present application during a nuclear power plant analysis process;

[0020] Figure 3 It is a data flow diagram for constructing a finite element substructure model and a finite element overall model in one embodiment of the present application;

[0021] Figure 4 is a flow chart of component attribute settings of a model in one embodiment of the present application;

[0022] Figure 5 is a component attribute setting table of a model in an embodiment of the present application;

[0023] Figure 6 is a flow chart of setting the takeover characteristic attributes of a model in one embodiment of the present application;

[0024] Figure 7 is a bolt feature attribute configuration table of a model in an embodiment of the present application;

[0025] Figure 8 This is a flow chart of automatically reading and generating entity and surface attributes by finite element in one embodiment of the present application;

[0026] Fig. 9 is a flow chart of stress result linearization in one embodiment of the present application;

[0027] Fig.10 is a schematic diagram of a finite element model of a device in an embodiment of the present application;

[0028] Fig.11 is a schematic diagram of a finite element model of a piping system in an embodiment of the present application;

[0029] Fig.12 is a schematic diagram of a finite element model for overall structural analysis in one embodiment of the present application;

[0030] Fig.13 is an exemplary flow chart of a mechanical integration margin balance analysis method for a nuclear power plant according to an embodiment of the present application;

[0031] Fig.14 It is a system block diagram of a nuclear power plant mechanical integrated margin balance analysis system according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0034] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0035] Flowcharts are used in the present application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0036] The present application proposes a nuclear power plant mechanical integrated margin balance analysis system, which can be applied in the scenario of automatically conducting rapid analysis and evaluation of the seismic performance of nuclear power plants.

[0037] Figure 1 is a schematic diagram of a nuclear power plant mechanical integration margin balance analysis system according to an embodiment of the present application, with reference to Figure 1As shown, the nuclear power plant mechanical integration margin balance analysis system 100 of this embodiment includes: a CAD software module 110, a CAD / CAE integrated tool module 120, a CAE software module 130, a finite element analysis software module 140, and a product lifecycle management software module 150. For example, the full name of CAD in English is Computer Aided Design, and the full name of CAE in English is Computer Aided Engineering. The above-mentioned modules in the nuclear power plant mechanical integration margin balance analysis system 100 of the present application can be implemented by a computer hardware device composed of a processor and a memory. Specifically, the above-mentioned modules are stored in the memory as program units, and the processor executes the program units stored in the memory to realize thread control.

[0038] Continue to refer Figure 1 As shown, the various modules of the nuclear power plant mechanical integration margin balance analysis system 100 are configured as follows: the CAD software module 110 models the nuclear power plant structure and generates a nuclear power plant structural model; the CAD / CAE integrated tool module 120 generates a standard nuclear power plant structural model based on the nuclear power plant structural model; the CAE software module 130 performs pre-processing on the standard nuclear power plant structural model and generates a nuclear power plant structural finite element model; the finite element analysis software module 140 generates a nuclear power plant structural super-unit finite element model based on the nuclear power plant structural finite element model, performs super-unit solution and time history analysis on the nuclear power plant structural super-unit finite element model, and generates a nuclear power plant structural time history result file; the product life cycle management software module 150 performs time history to spectrum conversion processing on the nuclear power plant structural time history result file to generate nuclear power plant structural response spectrum data; stress solution and stress result analysis are performed on the nuclear power plant structural response spectrum data to obtain nuclear power plant analysis results.

[0039] In some embodiments, the nuclear power plant structure includes: one or any combination of components, equipment, systems, plants, and pipelines; the CAD / CAE integrated tool module 120 includes Siemens NX; the CAE software module 130 includes SimCenter3D; the finite element analysis software module 140 includes NASTRAN; and the product lifecycle management software module 150 includes Teamcenter. Exemplarily, the Siemens PLM (Product Lifecycle Management) system Teamcenter (hereinafter referred to as the TC platform) is the world's leading product lifecycle management system. The nuclear power plant mechanical integrated margin balance analysis system 100 of the present application uses Teamcenter as the basic platform, which can provide unified data management, seamless business connection, and real-time information interaction capabilities.

[0040] Exemplarily, the analysis system of the present application is equivalent to a nuclear power plant mechanical integration margin balance analysis system based on a TC platform, which integrates:

[0041] CAD system is used to generate models of nuclear power plant components, equipment, systems and plant structures. This application can omit the CAD modeling stage and directly import the CAE model for analysis. In actual applications, users can directly modify the CAD model of each structure according to the task requirements, and then automatically generate finite element models, calculation analysis, stress solution and result evaluation according to the system instructions. It realizes the optimization of overall modeling, calculation of floor response spectrum and analysis of each surface and floor spectrum, and improves the seamless connection between design and simulation and the rapid iteration of analysis and optimization.

[0042] CAD / CAE integrated tool, based on the CAD system to set the CAE attribute tool, can realize the CAE system to automatically perform model processing (attribute reading and conversion, feature recognition, model processing, meshing, etc.), automatically add boundary conditions and loads, and automatically call the SNERDAS solver for calculation. For example, the SNERDAS solver is self-developed software and will not be introduced in this application. The SNERDAS solver can be replaced by the NASTRAN (NASA Structural Analysis System) solver.

[0043] The CAE system can read the finite element model conversion interface reserved in the CAD system, and is used to receive the command stream output by the CAD / CAE integration tool. The CAE finite element model of the plant can be reconstructed and output according to the command stream.

[0044] The TC integrated system can execute the CAD model import process, model attribute setting process, CAE model automatic generation and calculation analysis process, and specification comparison process, etc. For example, CAD format conversion, pre- and post-processing result analysis, calling time history spectrum conversion, uploading response spectrum data to TC, single component stress solution and uploading results to TC, result evaluation, etc.

[0045] Figure 2 This is a data flow diagram for constructing a finite element substructure model and a finite element overall model in one embodiment of the present application. Figure 2 As shown, for example, the component finite element model, equipment finite element model and system finite element model can generate sub-models based on user needs by combining the designed local components and the components connected within a certain range. The sub-model can re-divide the finite element mesh, input the load results of the overall model unit, combine them with the local load of the structure and perform stress analysis. For example, Fig.10 is a schematic diagram of a finite element model of a device in an embodiment of the present application, Fig.11 is a schematic diagram of a finite element model of a piping system in an embodiment of the present application; Fig.12 It is a schematic diagram of a finite element model for overall structural analysis in one embodiment of the present application.

[0046] This application is based on the TC platform, and can construct substructure models and set data associations based on components, equipment, systems, plant CAD, and traditional components, equipment, systems and plant finite elements. In the overall finite element model of the plant, it is no longer necessary to directly use a simplified model, but a substructure model of the equipment and system. The calculations of all equipment and subsystem models will be automatically completed in the system, and after the automatic completion of each interface, the data will be transmitted to the overall system-level model for analysis and calculation of the seismic spectrum and response spectrum. This application can implement the relevant interfaces of NX and the SNERDAS solver to complete the seismic margin balance analysis of typical scenarios. In practical applications, when modeling the finite element models of structures such as nuclear power plant components, equipment, systems and plants, one of the structures can be omitted and replaced by a simplified model.

[0047] This application builds a nuclear power plant mechanical integrated margin balance analysis system on the Teamcenter platform, which can quickly analyze and evaluate the seismic performance of nuclear power plants, as well as iteratively optimize the plant structure without using simplified processing methods. The system integrates CAD software and CAE software, optimizes the traditional manual modeling and analysis process, and transforms the originally scattered overall modeling, calculation of floor response spectra and analysis of various physical surfaces and floor spectra into an integrated and efficient analysis system, thereby achieving seamless association between design and simulation and rapid iteration of analysis and optimization. This application can not only reduce the risks caused by human operation during finite element modeling, but also improve the accuracy and efficiency of seismic performance analysis of nuclear power plants, providing strong support for the design and safety assessment of nuclear power plants.

[0048] Figure 3 It is a flow chart of the nuclear power plant mechanical integrated margin balance analysis system in the nuclear power plant analysis process in one embodiment of the present application. Figure 3 The five stages of model and data processing are roughly shown in FIG, represented by numbers 1 to 5.

[0049] For example, the process executed by the CAD / CAE integrated tool module 120 may correspond to Figure 3 In some embodiments, the steps of the CAD / CAE integrated tool module 120 generating a standard nuclear power plant structure model according to the nuclear power plant structure model include:

[0050] Step S121: parse the component configuration table and material configuration table of the nuclear power plant structure to obtain configuration information.

[0051] Step S122: Acquire the attribute information of the nuclear power plant structure model; wherein the attribute information includes boundary condition attributes, grid attributes, and feature attributes.

[0052] Step S123: assemble the overall model according to the configuration information and the attribute information, thereby generating a standard nuclear power plant structure model; wherein the format of the standard nuclear power plant structure model includes .step and / or .xt.

[0053] In some embodiments, the configuration information includes: one or any combination of component type, material, mesh unit type, mesh size, thickness, and simplification scheme; wherein the simplification scheme includes a simplified model and a non-simplified model, the non-simplified model represents 3D mesh division, the simplified model represents simplifying the model into mid-surfaces and performing 2D mesh division, each face of the simplified model is saved as a feature object or a component object, meshes are divided into different faces or entities according to different objects, and boundary conditions are set for different objects. Figure 8 This is a flow chart of the automatic reading and generation of entity and surface attributes of the finite element in an embodiment of the present application. For example, each entity that needs to be meshed needs to be assigned component attributes, and the generated mid-surface or mid-line components need to be named, and the corresponding cross-sectional attributes will be assigned later according to the three-dimensional model.

[0054] Boundary condition attributes include: fixed constraint surface, fixed constraint point, pressure surface, force surface, force point, one or any combination of them. In practical applications, boundary conditions can be assigned to points or surfaces.

[0055] Mesh properties include: mesh size and thickness of a surface or body. In practical applications, if the mesh size and thickness of some parts are inconsistent with the overall characteristics of the parts and need to be assigned separately, the user can select the surface or body that needs to be assigned attributes separately in the system and click to enter parameters such as mesh size and thickness.

[0056] Feature attributes include identifiable features, which include: nozzles, mass points, bolts, surface connection features, containers, or any combination thereof. Some information of feature attributes can be configured in the configuration table. For the processing of nozzles, welds, bolts and other structures, it is necessary to set them according to the model processing rules to facilitate subsequent operations and evaluations.

[0057] In some embodiments, the CAD / CAE integrated tool module 120 includes:

[0058] The component tool is used for users to set the component configuration table and material configuration table for analysis, and generate corresponding attributes on the corresponding component entity; the material configuration table includes temperature and mechanical parameters. For example, all input data, output data and evaluation conclusion data related to the user's task analysis, such as CAD models and material parameters, can be stored on the user's local computer.

[0059] The feature attribute tool is used for users to set feature configuration tables and material configuration tables, and generate corresponding attributes on corresponding components and / or surfaces. Exemplarily, the material library includes the physical properties and mechanical properties of materials at different temperatures. External mechanical loads such as load parameters can be given in an automatic table format for direct capture and use. The earthquake response spectrum can also be given in an automatic table format, including frequency and acceleration spectra. When combining loads, each component must clearly specify which loads there are, and an automatic combination method for each load must be given.

[0060] The property viewing tool is used for users to view all properties in the model, including component properties and feature properties.

[0061] The Stress Linearization tool allows the user to select a start point and an end point and create the corresponding line in the expression. Fig. 9 It is a flow chart of stress result linearization in one embodiment of the present application.

[0062] Figure 4 is a flow chart of component attribute settings of a model in one embodiment of the present application; Figure 5 is a component attribute setting table of a model in an embodiment of the present application; Figure 6 is a flow chart of setting the takeover characteristic attributes of a model in one embodiment of the present application; Figure 7 is a bolt feature attribute configuration table of the model in an embodiment of the present application. For example, the settings of component attributes and feature attributes can refer to Figures 4 to 7 shown.

[0063] In some embodiments, the CAE software module 130 performs pre-processing on the standard nuclear power plant structure model including:

[0064] Step S131: Inherit the attributes on the CAD surface to the CAE surface, and read the mesh attributes of CAEFace and CAEBody from the standard nuclear power plant structure model.

[0065] Step S132: Mesh division is performed according to mesh attributes. If hard points are found during mesh division, the hard points are created first and then mesh division is performed.

[0066] Step S133: Create corresponding boundary conditions according to the boundary attributes of CADFace and CAEBody on the CAD surface.

[0067] Exemplarily, the process executed by the finite element analysis software module 140 may correspond to Figure 3 In some embodiments, the finite element analysis software module 140 performs super-element solution and time history analysis on the super-element finite element model of the nuclear power plant structure, and the steps of generating a nuclear power plant structure time history result file include:

[0068] Step S141: Call the finite element solver to solve the super-element finite element model of the nuclear power plant structure, and obtain the binary file of the super-element model of the nuclear power plant structure. For example, the finite element model (Finite Element Modeling, FEM) can be imported into the SNERDAS software for finite element meshing and solving, and the cloud map is imported into NX after the results are obtained. Based on the SNERDAS software, convenient input and modification of parameters such as calculation analysis, loads, boundary constraints and material properties can be achieved.

[0069] Step S142: setting up automatic association relationships between all nuclear power plant structural finite element models to establish an integrated finite element model of the nuclear power plant.

[0070] Step S143: calling the finite element solver to perform time history analysis on the nuclear power plant structure super unit model binary file and the nuclear power plant integrated finite element model, thereby generating a nuclear power plant structure time history result file; wherein the format of the nuclear power plant structure time history result file is HDF5.

[0071] For example, the process executed by the product lifecycle management software module 150 may correspond to Figure 3 In some embodiments, the product lifecycle management software module 150 performs time-to-spectrum conversion processing on the nuclear power plant structure time-history result file, and the step of generating the nuclear power plant structure response spectrum data further includes: calling the time-to-spectrum conversion calculation program of the finite element solver to perform time-to-spectrum conversion processing on the nuclear power plant structure time-history result file, thereby generating the response spectrum data of the floor, equipment, and pipeline.

[0072] In some embodiments, the product lifecycle management software module 150 performs stress solution and stress result analysis on the nuclear power plant structure response spectrum data, and the steps of obtaining the nuclear power plant analysis results include:

[0073] Step S151: Perform stress solution on the nuclear power plant structure response spectrum data to generate a nuclear power plant structure stress result file; wherein, in the process of stress solution, for the uncertainty of the load direction of the pipeline, if a positive or negative sign appears, the positive sign and the negative sign are calculated separately, and a single take-over load is calculated a maximum of a preset number of times (for example, 64 times); if the result stress linearization is required, the line information is read and the corresponding node coordinates are found for line drawing calculation.

[0074] Step S152: Analyze and evaluate the stress results of the nuclear power plant structure stress result file according to the preset evaluation criteria, so as to obtain the analysis results of the nuclear power plant; wherein the analysis results of the nuclear power plant include the seismic analysis results of the overall plant level and / or the seismic analysis results of individual components. Exemplarily, structural evaluation standards such as equipment analysis and evaluation, pipeline analysis and evaluation, support analysis and evaluation, structural analysis and evaluation, and plant analysis and evaluation need to be provided by the user. The present application can automatically extract the seismic analysis results of each part of the structure based on the SNERDAS software, and compare the mechanical performance specifications and standards, and analyze the equipment, pipelines, supports, structures and plants in turn to determine whether the structural design of the nuclear power plant meets the specification requirements.

[0075] For example, the nuclear power plant mechanical integration margin balance analysis system provided by the present application based on the TC platform can achieve the following functions:

[0076] (1) Supports the import of CAD models of nuclear power plant components, equipment, systems and buildings, and users can modify the model parameters of each component based on CAD software during the design phase.

[0077] (2) CAD model attribute setting: import the component model files generated by CAD software into NX to generate .step, .xt and other model files. Based on the NX software interface, parse the component configuration table and material configuration table, read the default attributes of the structural models of the main components of the nuclear power plant, a large number of equipment, piping systems and civil engineering plants, and display them on the front-end UI. Users can edit them, click OK, and set the corresponding attributes of the finite element model on the corresponding component entity, including boundary condition attributes, mesh attributes, etc.

[0078] (3) Supports automatic generation of CAE models. The properties on the CAD surface will be inherited to the CAE surface. Based on this feature, the mesh properties of CAEFace and CAEBody are read in the FEM model. Meshing is performed based on the mesh properties. If hard points are found, hard points are created first and then meshing is performed. Corresponding boundary conditions are created based on the boundary properties of CADFace and CAEBody on the CAD surface.

[0079] (4) Support calling the SNERDAS solver, which can establish equipment finite element models, system finite element models, and finite element models of scattered plant items to generate super-element solutions and perform time history analysis. Create an interface between NX and SNERDAS, which can be directly called later.

[0080] (5) An integrated development interface is set up to build a structural model and set up automatic association relationships based on the traditional finite element models of components, equipment, systems and plants, so as to establish an integrated finite element model at the overall plant level.

[0081] (6) Based on the TC platform, the time-history spectrum calculation program of the SNERDAS solver is called to obtain the response spectrum data of floors, equipment, pipelines, etc., and upload them to the TC platform.

[0082] (7) The results of this application include the seismic analysis results of the entire plant level. For a single component, the overall load size and direction obtained upstream can be extracted and combined with the local load to obtain the SNERDAS stress solver calculation results. After the calculation is completed, the material information in the model is taken out, the limit value is calculated, and compared with the result obtained by stress merging.

[0083] The present application also proposes a nuclear power plant mechanical integration margin balance analysis method, using the nuclear power plant mechanical integration margin balance analysis system 100 as mentioned above. The nuclear power plant mechanical integration margin balance analysis method can be run in a local computer, for example, in a computer controller, and can also be run in a cloud platform. When the nuclear power plant mechanical integration margin balance analysis method is run on a cloud platform, the data of the local computer interacts with the cloud platform data through a wireless network. Exemplarily, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an interconnected cloud, and multiple clouds, or any combination thereof. The present application does not limit the operating environment of the nuclear power plant mechanical integration margin balance analysis method.

[0084] Fig.13 is an exemplary flow chart of a mechanical integration margin balance analysis method for a nuclear power plant according to an embodiment of the present application, with reference to Fig.13 As shown, the nuclear power plant mechanical integration margin balance analysis method of this embodiment includes the following steps:

[0085] Step S1: Modeling the nuclear power plant structure to generate a nuclear power plant structure model.

[0086] Step S2: Generate a standard nuclear power plant structure model according to the nuclear power plant structure model.

[0087] Step S3: Pre-process the standard nuclear power plant structure model to generate a nuclear power plant structure finite element model.

[0088] Step S4: Generate a nuclear power plant structure super-element finite element model based on the nuclear power plant structure finite element model, perform super-element solution and time history analysis on the nuclear power plant structure super-element finite element model, and generate a nuclear power plant structure time history result file.

[0089] Step S5: Perform time-history conversion on the nuclear power plant structure time-history result file to generate nuclear power plant structure response spectrum data; perform stress solution and stress result analysis on the nuclear power plant structure response spectrum data to obtain nuclear power plant analysis results.

[0090] refer to Figure 3As shown, illustratively, the nuclear power plant mechanical integration margin balance analysis system of the present application can be used to perform the following process:

[0091] (1) Establish the actual structural CAD model of the nuclear power plant for seismic analysis, including the main components, a large number of equipment, piping systems, and civil engineering buildings.

[0092] (2) Based on the imported structural CAD models, the NX software platform is used to convert the CAD format to output the NX models of components, equipment, systems, plants and pipelines, and complete the assembly of the overall model. Based on the NX platform, the parameters and different attributes of each part of the model are input, including component configuration attributes, material configuration attributes, feature configuration attributes, boundary condition configuration attributes, mesh configuration attributes, etc.

[0093] (3) Import the assembled NX model into SimCenter3D and automatically perform model pre-processing, including attribute reading and conversion, feature recognition, model processing, meshing, etc. Establish equipment finite element model, system finite element model and sporadic plant finite element model respectively.

[0094] (4) The above finite element model is exported as a DAT file, imported into the SNERDAS finite element software, and super-element finite element models of equipment, systems and plant buildings are established. The SNERDAS solver is called to perform finite element super-element solution. Binary model files of the equipment super-element model, system super-element model and sporadic plant item super-element model are exported respectively.

[0095] (5) Import the binary files of the super-element models of the above-mentioned components into the SNERDAS solver, establish an integrated finite element model of the entire plant, carry out time history analysis, and output the HDF5 time history result file.

[0096] (6) Based on the TC platform, the time-history spectrum conversion program of the SNERDAS software is called to obtain the response spectrum data of floors, equipment, pipelines, etc.

[0097] (7) Upload the above data to the TC platform, provide the TC form including material information, etc., and then import it into the SNERDAS software for single component stress solution and output the HDF5 stress result file.

[0098] (8) After analyzing the HDF5 stress result file, the results of each structure can be evaluated, including equipment analysis and evaluation, pipeline analysis and evaluation, support analysis and evaluation, structural analysis and evaluation, and plant analysis and evaluation.

[0099] Exemplarily, the data transfer format, data transfer interface, and computer memory and processor can execute and implement the data transfer of any one of the geometric models, finite element models and result files in the above processes (1) to (8).

[0100] The technical solution of this application has the following technical effects:

[0101] 1. It eliminates a series of pre-processing operations of the finite element models of traditional nuclear power plant components, equipment, systems, plant structures, etc.

[0102] 2. It eliminates the need for repeated setting of the correlation relationship of the finite element model for the integrated mechanical analysis of the entire nuclear power plant.

[0103] 3. The super-element method is used for seismic analysis, which greatly improves the calculation efficiency and fully considers the stiffness, damping effect and dynamic characteristics of the corresponding items.

[0104] 4. Stress analysis of a single component can be calculated locally to ensure the calculation accuracy of key components.

[0105] 5. The calculation efficiency of the integrated seismic margin analysis of nuclear power plants has been improved, and the finite element models of nuclear power plant components, equipment, systems, and plant structures have been changed from traditional manual modeling to automatic modeling, which has greatly reduced the workload and intensity of subsequent verification and approval.

[0106] 6. Teamcenter is used to manage the entire calculation process, and there is no loss or error of information before and after, which reduces the risk of human error in the integrated finite element modeling process of the plant and ensures the quality of the structural seismic analysis.

[0107] 7. Realized seamless integration of TC software, NX software and SNERDAS software.

[0108] The present application also includes a nuclear power plant mechanical integration margin balance analysis system, including a memory and a processor. The memory is used to store instructions executable by the processor; the processor is used to execute the instructions to implement the nuclear power plant mechanical integration margin balance analysis method described above.

[0109] Fig.14 1 is a system block diagram of a nuclear power plant mechanical integration margin balance analysis system according to an embodiment of the present application. Fig.14As shown, the nuclear power plant mechanical integration margin balance analysis system 1400 may include an internal communication bus 1401, a processor 1402, a read-only memory (ROM) 1403, a random access memory (RAM) 1404, and a communication port 1405. The nuclear power plant mechanical integration margin balance analysis system 1400 may also include a hard disk 1406. The internal communication bus 1401 can realize data communication between components of the nuclear power plant mechanical integration margin balance analysis system 1400. The processor 1402 can make judgments and issue prompts. In some embodiments, the processor 1402 can be composed of one or more processors. The communication port 1405 can realize data communication between the nuclear power plant mechanical integration margin balance analysis system 1400 and the outside. In some embodiments, the nuclear power plant mechanical integration margin balance analysis system 1400 can send and receive information and data from the network through the communication port 1405. The nuclear power plant mechanical integration margin balance analysis system 1400 may also include different forms of program storage units and data storage units, such as a hard disk 1406, a read-only memory (ROM) 1403 and a random access memory (RAM) 1404, which can store various data files used for computer processing and / or communication, and possible program instructions executed by the processor 1402. The processor executes these instructions to implement the main part of the method. The results processed by the processor are transmitted to the user device through the communication port and displayed on the user interface.

[0110] The above-mentioned nuclear power plant mechanical integration margin balance analysis method can be implemented as a computer program, stored in the hard disk 1406, and can be loaded into the processor 1402 for execution to implement the nuclear power plant mechanical integration margin balance analysis method of the present application.

[0111] The present application also includes a computer-readable medium storing a computer program code, which, when executed by a processor, implements the mechanical integration margin balance analysis method for a nuclear power plant as described above.

[0112] When the mechanical integration margin balance analysis method of a nuclear power plant is implemented as a computer program, it can also be stored in a computer-readable storage medium as a product. For example, a computer-readable storage medium may include, but is not limited to, magnetic storage devices (e.g., hard disks, floppy disks, magnetic strips), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs)), smart cards, and flash memory devices (e.g., electrically erasable programmable read-only memories (EPROMs), cards, sticks, key drives). In addition, the various storage media described herein can represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media (and / or storage media) that can store, contain and / or carry code and / or instructions and / or data.

[0113] It should be understood that the embodiments described above are only illustrative. The embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For hardware implementation, the processor may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and / or other electronic units designed to perform the functions described herein, or a combination thereof.

[0114] Some aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor may be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, various aspects of the present application may be expressed as computer products located in one or more computer-readable media, which include computer-readable program codes. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, tapes ...), optical disks (e.g., compact disks CDs, digital versatile disks DVDs ...), smart cards, and flash memory devices (e.g., cards, sticks, key drives ...).

[0115] A computer-readable medium may include a propagated data signal containing computer program code, such as in baseband or as part of a carrier wave. The propagated signal may have a variety of manifestations, including electromagnetic, optical, etc., or a suitable combination. A computer-readable medium may be any computer-readable medium other than a computer-readable storage medium, which may be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit a program for use. The program code on the computer-readable medium may be propagated via any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar medium, or any combination of the above mediums.

[0116] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0117] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0118] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

Claims

1. A mechanical integration margin balance analysis system for a nuclear power plant, characterized in that: include: CAD software module, CAD / CAE integrated tool module, CAE software module, finite element analysis software module, product life cycle management software module, each of the modules is configured as: The CAD software module models the nuclear power plant structure and generates a nuclear power plant structure model; The CAD / CAE integrated tool module generates a standard nuclear power plant structure model according to the nuclear power plant structure model; The CAE software module performs pre-processing on the standard nuclear power plant structure model to generate a nuclear power plant structure finite element model; The finite element analysis software module generates a nuclear power plant structure super-element finite element model according to the nuclear power plant structure finite element model, performs super-element solution and time history analysis on the nuclear power plant structure super-element finite element model, and generates a nuclear power plant structure time history result file; The product lifecycle management software module performs time-history conversion on the nuclear power plant structure time-history result file to generate nuclear power plant structure response spectrum data; Stress solution and stress result analysis are performed on the structural response spectrum data of the nuclear power plant to obtain nuclear power plant analysis results.

2. The nuclear power plant mechanical integrated margin balance analysis system according to claim 1, characterized in that: The nuclear power plant structure includes: one or any combination of components, equipment, systems, plant buildings, and pipelines; the CAD / CAE integrated tool module includes Siemens NX; the CAE software module includes SimCenter3D; the finite element analysis software module includes NASTRAN; and the product lifecycle management software module includes Teamcenter.

3. The nuclear power plant mechanical integrated margin balance analysis system according to claim 1, characterized in that: The step of generating a standard nuclear power plant structure model according to the nuclear power plant structure model by the CAD / CAE integrated tool module comprises: Parsing the component configuration table and material configuration table of the nuclear power plant structure to obtain configuration information; Acquiring attribute information of the nuclear power plant structure model; wherein the attribute information includes boundary condition attributes, grid attributes, and feature attributes; The overall model is assembled according to the configuration information and the attribute information, thereby generating the standard nuclear power plant structure model; wherein the format of the standard nuclear power plant structure model includes .step and / or .xt.

4. The nuclear power plant mechanical integrated margin balance analysis system according to claim 3, characterized in that: The configuration information includes: one or any combination of component type, material, mesh unit type, mesh size, thickness, and simplification scheme; wherein the simplification scheme includes a simplified model and a non-simplified model, the non-simplified model represents 3D meshing, the simplified model represents simplifying the model into mid-surfaces and performing 2D meshing, each surface of the simplified model is saved as a feature object or a component object, meshes are divided for different surfaces or entities according to different objects, and boundary conditions are set for different objects; The boundary condition attributes include: one or any combination of fixed constraint surface, fixed constraint point, pressure surface, force surface, force point; The mesh properties include: mesh size and thickness of a surface or body; The feature attributes include identifiable features, and the identifiable features include: one or any combination of nozzles, mass points, bolts, surface connection features, and containers.

5. The nuclear power plant mechanical integrated margin balance analysis system according to claim 1 or 3, characterized in that: The CAD / CAE integrated tool module includes: Component tool, used for users to set the parsed component configuration table and material configuration table, and generate corresponding attributes on the corresponding component entity; wherein the material configuration table includes temperature and mechanical parameters; Feature attribute tool, used for users to set feature configuration table and material configuration table, and generate corresponding attributes on corresponding parts and / or surfaces; An attribute viewing tool is used to allow the user to view all attributes in the model, including component attributes and feature attributes; The Stress Linearization tool allows the user to select a start and end point and create the corresponding line in the expression.

6. The nuclear power plant mechanical integrated margin balance analysis system according to claim 1, characterized in that: The step of pre-processing the standard nuclear power plant structure model by the CAE software module comprises: Inheriting the properties on the CAD surface to the CAE surface, and reading the mesh properties of CAEFace and CAEBody from the standard nuclear power plant structure model; Performing mesh division according to the mesh attributes, and if a hard point is found during the mesh division, first creating the hard point and then performing mesh division; According to the boundary properties of CADFace and CAEBody on the CAD surface, corresponding boundary conditions are created.

7. The nuclear power plant mechanical integration margin balance analysis system according to claim 1, characterized in that: The finite element analysis software module performs super-element solution and time history analysis on the super-element finite element model of the nuclear power plant structure, and the steps of generating a nuclear power plant structure time history result file include: Calling a finite element solver to perform super-element solution on the nuclear power plant structure super-element finite element model to obtain a nuclear power plant structure super-element model binary file; Set up automatic associations between all nuclear power plant structural finite element models and establish an integrated finite element model of the nuclear power plant; The finite element solver is called to perform time history analysis on the nuclear power plant structure super unit model binary file and the nuclear power plant integrated finite element model, thereby generating the nuclear power plant structure time history result file; wherein the format of the nuclear power plant structure time history result file is HDF5.

8. The nuclear power plant mechanical integrated margin balance analysis system according to claim 1, characterized in that: The product lifecycle management software module performs time-history-to-spectrum processing on the nuclear power plant structure time-history result file, and the step of generating nuclear power plant structure response spectrum data further includes: calling the time-history-to-spectrum calculation program of the finite element solver to perform time-history-to-spectrum processing on the nuclear power plant structure time-history result file, thereby generating response spectrum data of floors, equipment, and pipelines.

9. The nuclear power plant mechanical integration margin balance analysis system according to claim 1, characterized in that: The product lifecycle management software module performs stress solution and stress result analysis on the structural response spectrum data of the nuclear power plant, and the steps of obtaining the analysis results of the nuclear power plant include: Perform stress solving on the structural response spectrum data of the nuclear power plant to generate a stress result file of the nuclear power plant structure; wherein, in the process of stress solving, for the uncertainty of the load direction of the pipeline, the positive sign and the negative sign are calculated respectively, and a single pipe load is calculated for a maximum of a preset number of times; if the result stress linearization is required, the line information is read and the corresponding node coordinates are found for line drawing calculation; The stress result analysis and evaluation of the nuclear power plant structure stress result file is performed according to preset evaluation standards to obtain the nuclear power plant analysis results; wherein the nuclear power plant analysis results include the overall plant-level seismic analysis results and / or the seismic analysis results of individual components.

10. A mechanical integration margin balance analysis method for a nuclear power plant, characterized in that: The nuclear power plant mechanical integrated margin balance analysis system according to any one of claims 1 to 9 comprises: Model the nuclear power plant structure and generate a nuclear power plant structure model; Generate a standard nuclear power plant structure model according to the nuclear power plant structure model; Pre-processing the standard nuclear power plant structure model to generate a nuclear power plant structure finite element model; Generate a nuclear power plant structure super-element finite element model according to the nuclear power plant structure finite element model, perform super-element solution and time history analysis on the nuclear power plant structure super-element finite element model, and generate a nuclear power plant structure time history result file; The time history result file of the nuclear power plant structure is subjected to time history conversion to spectrum processing to generate the nuclear power plant structure response spectrum data; the stress solution and stress result analysis are performed on the nuclear power plant structure response spectrum data to obtain the nuclear power plant analysis result.

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