Digital reactor multi-level multi-physical simulation system, method, equipment and medium

Abstract

The invention discloses a digital reactor multi-level multi-physical simulation system, method, equipment and medium, and the method comprises the following steps: dividing the simulation level of a whole reactor system into five simulation levels according to the size from small to large; the coupling modules are a fuel material level multi-specialty coupling module, an element level multi-specialty coupling module, an assembly level multi-specialty coupling module, a reactor core level multi-specialty coupling module and a system level multi-specialty coupling module; the coupling modules of different simulation levels are in communication connection; the coupling module of each simulation level comprises a plurality of professional calculation units, and the simulation calculation specialty of each professional calculation unit comprises a reactor fuel specialty, a reactor physics specialty and a reactor thermal fluid and safety analysis specialty. Wherein the lower the simulation level is, the smaller the scale is, the professional calculation unit with the higher fine degree is used for coupling, and otherwise, the coarser the graining professional calculation unit is used step by step. According to the method, the simulation calculation amount is remarkably reduced, and the loss of simulation calculation accuracy is well made up.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear reactors, and in particular to a digital reactor multi-level multi-physics simulation system, method, equipment and medium. Background Art

[0002] With the advancement of digital engineering, the development of new products, including nuclear reactors, will gradually move toward "zero-prototype engineering." This approach will promote agile R&D through a combination of extensive numerical simulations and physical testing of typical characteristic points. This will explore and identify key issues, early detect development risks, and support a "left shift" in assessment and evaluation. The R&D of new reactors will gradually shift from primarily physical iteration to primarily virtual iteration, continuously reducing physical verification testing, further reducing R&D costs, and shortening R&D cycles. This trend requires continuous improvement in the accuracy and universality of numerical simulation technology. This can be achieved by developing theoretical models toward more realistic and comprehensive mechanisms, moving from decoupled approximations to coupled simulations across multiple interrelated disciplines, and using higher-order methods in the formulation of partial differential equations, discretization into algebraic equations, and numerical solution. However, these technological improvements often result in a significant increase in computational effort, resulting in a very high cost. Even supercomputers cannot accurately simulate the entire new reactor system within acceptable computational times.

[0003] Therefore, if direct overall simulation is used for the multi-physics coupling simulation of existing reactors, there is a problem of excessive computational cost caused by the overall coupling simulation of various professional advanced programs in order to improve accuracy and universality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing multi-physics coupled simulation of reactors uses direct overall simulation, which leads to excessive computational cost due to the overall coupled simulation of various advanced professional programs in order to improve accuracy and universality. The purpose of the present invention is to provide a multi-level multi-physics simulation system, method, equipment and medium for digital reactors. The present invention proposes dividing the coupled simulation of the reactor system into multiple levels, simulating each level separately to reduce the simulation computation load. The closer the level is to the bottom, the smaller the scale, and the more accurate the specialized computing units can be used for the coupling of that level. Conversely, for coupling at large-scale levels, coarser specialized computing units can be used or even some specialized computing units can be ignored, further reducing the computation load. At the same time, a certain amount of data interaction and even iteration is enabled between different levels. For example, the large-scale level provides boundary conditions and operating environment for the small-scale level simulation, and the small-scale level provides parameter models and parameter distribution information for the large-scale level simulation. This significantly reduces the simulation computation load while also effectively improving the simulation computation accuracy.

[0005] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a digital reactor multi-level multi-physics simulation system, which includes dividing the simulation level of the entire reactor system into five simulation levels according to the scale from small to large, namely: a fuel material level multi-professional coupling module, a component level multi-professional coupling module, a component level multi-professional coupling module, a core level multi-professional coupling module, and a system level multi-professional coupling module; The coupling modules at different simulation levels are connected to each other; each coupling module at the simulation level includes multiple specialized computing units, and the simulation computing specialties of the specialized computing units include reactor fuel, reactor physics, and reactor thermal fluid and safety analysis. Among them, the lower the simulation level, the smaller the scale, and more sophisticated professional computing units are used for coupling. Conversely, more coarse-grained professional computing units are gradually used.

[0006] According to the above technical solution, the present invention divides the entire reactor system into five simulation levels according to the scale from small to large: fuel material level multi-professional coupling module, component level multi-professional coupling module, assembly level multi-professional coupling module, core level multi-professional coupling module, and system level multi-professional coupling module. The disciplines involved in the reactor simulation calculation consider multiple physical models and solution algorithms at the same time according to the degree of model refinement. The larger the level scale, the coarser the model can be used or even some disciplines can be ignored. Conversely, the more accurate the model can be used and the influence of more disciplines can be considered. Data is exchanged between the coupling modules at different levels, and partial or overall iteration is achieved as needed to compensate for the errors caused by the approximate processing of the model divided into five simulation levels and the larger scale level. The present invention can significantly reduce the amount of simulation calculations while better improving the accuracy of simulation calculations.

[0007] Furthermore, the simulation computing specialty considers multiple physical models and solution algorithms according to the level of model sophistication, forming different specialized computing units, including: For the reactor fuel specialty, according to the model sophistication from high to low, it is divided into atomic scale parameter calculation unit, mesoscale microstructure evolution simulation calculation unit, fuel performance macroscopic calculation unit and fuel assembly irradiation deformation calculation unit. Among them, the atomic scale parameter calculation unit includes the first principle calculation unit and the molecular dynamics calculation unit, and the mesoscale microstructure evolution simulation calculation unit includes the phase field method calculation unit, rate theory calculation unit, dislocation dynamics calculation unit and dynamic Monte Carlo calculation unit. For reactor physics majors, the calculation units are divided into resonance-transport-burnup calculation unit and diffusion-burnup calculation unit according to the model sophistication from high to low. For the reactor thermal fluid and safety analysis major, it is divided into computational fluid dynamics unit, core thermal sub-channel calculation unit and reactor system analysis unit according to the model precision from high to low.

[0008] Furthermore, the smaller the simulation level scale of the coupling module, the more specialized computing units with a higher model precision are used; conversely, the less specialized computing units with a lower model precision are used or even some specialized computing units are ignored.

[0009] Furthermore, coupling modules at different simulation levels include: The fuel material-level multi-disciplinary coupling module includes an atomic-scale parameter calculation unit, a mesoscopic-scale microstructure evolution simulation calculation unit, and a fuel performance macroscopic calculation unit; The component-level multi-disciplinary coupling module includes a fuel performance macro calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit; The component-level multi-disciplinary coupling module includes the fuel assembly irradiation deformation calculation unit, the resonance-transport-burnup calculation unit, and the computational fluid dynamics unit; The core-level multi-disciplinary coupling module includes the resonance-transport-burnup calculation unit and the core thermal sub-channel calculation unit; The system-level multi-disciplinary coupling module includes a diffusion-burnup calculation unit (a resonance-transport-burnup calculation unit is used under special requirements), a computational fluid dynamics unit, a core thermal sub-channel calculation unit, and a reactor system analysis unit.

[0010] Furthermore, the smaller the simulation level scale of the coupling module, the smaller the modeling scope, the more refined the modeling, and vice versa, including: The fuel material-level multi-disciplinary coupling module considers the internal details of the atoms and molecules in the material and models and calculates local representative fuel materials; The component-level multi-disciplinary coupling module no longer considers the internal details of the material, such as atoms and molecules, but instead treats the fuel material as a continuous medium and models and calculates individual fuel elements; The component-level multi-disciplinary coupling module no longer considers the internal details of the fuel element and models and calculates the individual fuel components; The core-level multi-discipline coupling module no longer directly considers the reactor fuel discipline, but instead divides each fuel element into sections and performs a certain degree of homogenization. By considering the uneven radial distribution of the fuel elements through the equivalent of the fuel effective temperature, the entire core is modeled and calculated. The system-level multi-disciplinary coupling module no longer directly considers the reactor fuel discipline, and instead divides each fuel assembly into segments for certain homogenization treatment, and models and calculates the entire reactor system including the core and loop system.

[0011] Furthermore, the coupling modules at different simulation levels are connected to each other, and partial or full iteration is implemented as needed to exchange data between the coupling modules, specifically including: The fuel material level multi-disciplinary coupling module calculates the fuel material parameters taking into account the irradiation effect and provides the fuel material parameters to the element level multi-disciplinary coupling module, the assembly level multi-disciplinary coupling module and the core level multi-disciplinary coupling module; The element-level multi-discipline coupling module calculates the performance parameters of the fuel elements using the fuel material parameters provided by the fuel material-level multi-discipline coupling module or the physical test measurements, and the service parameters of the representative fuel elements or the fuel elements of interest provided by the core-level multi-discipline coupling module, and provides the performance parameters of the fuel elements to the core-level multi-discipline coupling module; The assembly-level multi-disciplinary coupling module calculates the performance parameters of the fuel assembly using the fuel material parameters provided by the fuel material-level multi-disciplinary coupling module or the physical test measurement, and the service parameters of the representative fuel assembly or the fuel assembly of interest provided by the core-level multi-disciplinary coupling module, and provides the fuel assembly performance parameters to the core-level multi-disciplinary coupling module; The core-level multi-disciplinary coupling module calculates the core performance parameters using the fuel material parameters provided by the fuel material-level multi-disciplinary coupling module or physical test measurements, the fuel effective temperatures of various fuel elements at different burnup depths and power levels provided by the element-level multi-disciplinary coupling module, the deformations of various fuel assemblies at different burnup depths, power levels and burnup gradients provided by the assembly-level multi-disciplinary coupling module, and the core coolant distribution provided by the system-level multi-disciplinary coupling module. The core performance parameters and fuel assembly performance parameters are then provided to the system-level multi-disciplinary coupling module. The system-level multi-disciplinary coupling module uses the core performance parameters and fuel assembly performance parameters provided by the core-level multi-disciplinary coupling module to calculate the three-dimensional distribution of temperature, flow, and pressure of the coolant in the reactor pressure vessel and the one-dimensional distribution of temperature, flow, and pressure in the loop system, and provides the two-dimensional distribution of temperature, flow, and pressure of the coolant at key parts of the pressure vessel and the core inlet to the core-level multi-disciplinary coupling module.

[0012] Furthermore, fuel material parameters include thermal conductivity, specific heat capacity, elastic modulus, and Poisson's ratio; The service parameters of the fuel elements include power history, coolant temperature, and coolant flow rate; The performance parameters of the fuel elements include fine temperature field, stress-strain field and fission gas concentration field; The service parameters of the fuel assembly include power history, coolant temperature, coolant flow rate, and assembly boundary neutron flux albedo distribution; The performance parameters of fuel assemblies include temperature field and stress-strain field; Core performance parameters include power distribution, neutron flux distribution, burnup distribution and temperature distribution.

[0013] In a second aspect, the present invention provides a multi-level and multi-physics simulation method for a digital reactor, the simulation method comprising: The simulation levels of the entire reactor system are divided into five simulation levels from small to large, namely: fuel material level multi-professional coupling module, component level multi-professional coupling module, assembly level multi-professional coupling module, core level multi-professional coupling module, and system level multi-professional coupling module; The coupling modules at different simulation levels communicate with each other and implement partial or full iteration to exchange data between the coupling modules as needed; Among them, the coupling module of each simulation level includes multiple professional computing units, and the simulation computing majors of the professional computing units include reactor fuel major, reactor physics major, and reactor thermal fluid and safety analysis major.

[0014] Furthermore, the simulation computing specialty considers multiple physical models and solution algorithms according to the level of model sophistication, forming different specialized computing units, including: For the reactor fuel specialty, according to the model sophistication from high to low, it is divided into atomic scale parameter calculation unit, mesoscale microstructure evolution simulation calculation unit, fuel performance macroscopic calculation unit and fuel assembly irradiation deformation calculation unit. Among them, the atomic scale parameter calculation unit includes the first principle calculation unit and the molecular dynamics calculation unit, and the mesoscale microstructure evolution simulation calculation unit includes the phase field method calculation unit, rate theory calculation unit, dislocation dynamics calculation unit and dynamic Monte Carlo calculation unit. For reactor physics majors, the calculation units are divided into resonance-transport-burnup calculation unit and diffusion-burnup calculation unit according to the model sophistication from high to low. For the reactor thermal fluid and safety analysis major, it is divided into computational fluid dynamics unit, core thermal sub-channel calculation unit and reactor system analysis unit according to the model precision from high to low.

[0015] Furthermore, the smaller the simulation level of the coupling module, the more specialized computing units with a higher model precision are used. Conversely, the less refined the model, the less specialized computing units are used or even some specialized computing units are ignored, including: The fuel material-level multi-disciplinary coupling module includes an atomic-scale parameter calculation unit, a mesoscopic-scale microstructure evolution simulation calculation unit, and a fuel performance macroscopic calculation unit; The component-level multi-disciplinary coupling module includes a fuel performance macro calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit; The component-level multi-disciplinary coupling module includes the fuel assembly irradiation deformation calculation unit, the resonance-transport-burnup calculation unit, and the computational fluid dynamics unit; The core-level multi-disciplinary coupling module includes the resonance-transport-burnup calculation unit and the core thermal sub-channel calculation unit; The system-level multi-disciplinary coupling module includes a diffusion-burnup calculation unit (a resonance-transport-burnup calculation unit is used under special requirements), a computational fluid dynamics unit, a core thermal sub-channel calculation unit, and a reactor system analysis unit.

[0016] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned digital reactor multi-level and multi-physics simulation method is implemented.

[0017] In a fourth aspect, the present invention further provides a computer-readable storage medium storing a computer program, which implements the above-mentioned digital reactor multi-level and multi-physics simulation method when executed by a processor.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. Compared with direct overall simulation of the reactor system, the digital reactor multi-level and multi-physics simulation system, method, equipment and medium of the present invention divides the entire reactor system into five simulation levels for separate calculations. In addition, relatively rough models can be used at larger-scale simulation levels, and even some disciplines do not need to be considered, which significantly reduces the amount of simulation calculations.

[0019] 2. Compared with isolated calculations of different scales of the reactor system, the multi-level and multi-physics simulation system, method, equipment and medium of the digital reactor of the present invention adopts a strategy of interactive iteration of coupling modules at different simulation levels, which better compensates for the loss of simulation calculation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 This is a block diagram of the components of the coupling modules at each level in the multi-level multi-physics simulation system for a digital reactor of the present invention; Figure 2 It is the interactive relationship between the coupling modules at each level in the multi-level multi-physics simulation system of the digital reactor of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0022] Example 1 like Figure 1 As shown in the figure, the digital reactor multi-level multi-physics simulation system of the present invention includes five simulation levels that divide the simulation level of the entire reactor system into five simulation levels according to the scale from small to large, namely: fuel material level multi-professional coupling module (i.e. Figure 1 fuel material level multi-scale coupling module in the fuel material level multi-professional coupling module (i.e. Figure 1 Element-level physics-thermal-fuel coupling module), component-level multi-disciplinary coupling module (i.e. Figure 1 Component-level irradiation-thermal-fluid-solid coupling module), core-level multi-disciplinary coupling module (i.e. Figure 1 Component-level radiation-thermal-fluid-solid coupling module), system-level multi-disciplinary coupling module (i.e. Figure 1 System-level physics-thermal-control coupling module in ); The coupling modules at different simulation levels are connected to each other; the coupling modules at each simulation level include multiple professional computing units, and the simulation computing majors of the professional computing units include reactor fuel major, reactor physics major, and reactor thermal fluid and safety analysis major.

[0023] Figure 1 This is a block diagram of the coupling modules at each simulation level. As the simulation level gets lower, the scale gets smaller, and more refined specialized computing units are used for coupling. Conversely, increasingly coarse-grained specialized computing units are used.

[0024] In this embodiment, the simulation computing specialty considers multiple physical models and solution algorithms according to the level of model sophistication, forming different specialized computing units, including: (1) For the reactor fuel specialty, according to the model sophistication from high to low, it is divided into atomic scale parameter calculation unit (including first principle calculation unit and molecular dynamics calculation unit), mesoscopic scale microstructure evolution simulation calculation unit (including phase field method calculation unit, rate theory calculation unit, dislocation dynamics calculation unit, dynamic Monte Carlo calculation unit), fuel performance macroscopic calculation unit and fuel assembly irradiation deformation calculation unit; specifically, the atomic scale parameter calculation unit, mesoscopic scale microstructure evolution simulation unit and fuel performance macroscopic calculation unit are used in the fuel material level multi-specialty coupling module to transfer the calculation results step by step from small scale to large scale (micro → meso → macro); the fuel performance macroscopic calculation unit is used in the component level multi-specialty coupling module, and the fuel assembly irradiation deformation calculation unit is used in the assembly level multi-specialty coupling module.

[0025] (2) For the reactor physics discipline, it is divided into resonance-transport-burnup calculation unit and diffusion-burnup calculation unit according to the degree of model sophistication from high to low; specifically, the transport-resonance-burnup calculation unit is used in the element-level multi-discipline coupling module, the component-level multi-discipline coupling module, and the core-level multi-discipline coupling module, and the diffusion-burnup calculation unit is mainly used in the system-level multi-discipline coupling module. Under special requirements, the transport-resonance-burnup calculation unit can also be used, but the calculation cost is higher.

[0026] (3) For the reactor thermal fluid and safety analysis discipline, the disciplines are divided into computational fluid dynamics units, core thermal sub-channel computational units, and reactor system analysis units according to the model sophistication from high to low. Specifically, the computational fluid dynamics unit (and possibly the core thermal sub-channel computational unit) is used in the element-level multi-discipline coupling module and the component-level multi-discipline coupling module, the core sub-channel computational unit is used in the core-level multi-discipline coupling module, and the computational fluid dynamics unit, core thermal sub-channel computational unit, and reactor system analysis unit are used in the system-level multi-discipline coupling module.

[0027] In this embodiment, the smaller the simulation level scale of the coupling module, the more specialized computing units with a higher model precision are used; conversely, the less specialized computing units with a lower model precision are used or even some specialized computing units are ignored.

[0028] In this embodiment, the coupling modules at different simulation levels include: The fuel material-level multi-disciplinary coupling module includes an atomic-scale parameter calculation unit, a mesoscopic-scale microstructure evolution simulation calculation unit, and a fuel performance macroscopic calculation unit. The atomic-scale parameter unit can provide the mesoscopic-scale microstructure evolution simulation unit with key fuel parameters, such as irradiation defect formation energy, defect / fission gas atomic diffusion coefficient, interface energy, etc. The mesoscopic-scale microstructure evolution simulation unit can provide the evolution data and performance models of key microstructure characteristics of fuel materials, such as fuel porosity evolution and swelling model, cladding dislocation loop evolution and irradiation hardening model, etc., as constitutive model input for the fuel performance macroscopic calculation module.

[0029] The element-level multi-disciplinary coupling module includes a fuel performance macro-calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit (a core thermal sub-channel calculation unit may also be used). The resonance-transport-burnup calculation unit transmits the power distribution, burnup distribution, and fast neutron fluence rate distribution to the fuel performance macro-calculation unit. The fuel performance macro-calculation unit transmits the heat flux density distribution on the fuel cladding surface to the computational fluid dynamics analysis unit, and simultaneously transmits the fuel temperature distribution and size distribution to the resonance-transport-burnup calculation unit. The computational fluid dynamics analysis unit transmits the coolant temperature distribution and density distribution to the resonance-transport-burnup calculation unit, and simultaneously transmits the coolant temperature distribution and heat transfer coefficient distribution to the fuel performance macro-calculation unit.

[0030] The assembly-level multi-disciplinary coupling module includes a fuel assembly irradiation deformation calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit. The resonance-transport-burnup calculation unit transmits the power distribution, burnup distribution, and fast neutron fluence rate distribution to the fuel assembly irradiation deformation calculation unit. The fuel assembly irradiation deformation calculation unit transmits the cladding surface heat flux density distribution and flow channel deformation distribution to the computational fluid dynamics unit, and simultaneously transmits the fuel temperature distribution and deformation distribution to the resonance-transport-burnup calculation unit. The computational fluid dynamics unit transmits the coolant temperature distribution and density distribution to the resonance-transport-burnup calculation unit, and simultaneously transmits the coolant temperature distribution and heat transfer coefficient distribution to the fuel assembly irradiation deformation calculation unit.

[0031] The core-level multi-disciplinary coupling module includes a resonance-transport-burnup calculation unit and a core thermal sub-channel calculation unit; among them, the resonance-transport-burnup calculation unit transmits the power distribution to the core thermal sub-channel calculation unit, and the core thermal sub-channel calculation unit transmits the coolant temperature distribution and density distribution to the resonance-transport-burnup calculation unit.

[0032] The system-level multi-disciplinary coupling module includes a diffusion-burnup calculation unit (the resonance-transport-burnup calculation unit is used under special requirements), a computational fluid dynamics unit, a core thermal subchannel calculation unit, and a reactor system analysis unit. The diffusion-burnup calculation unit transmits the power distribution to the core thermal subchannel calculation unit, which in turn transmits the coolant core outlet pressure, temperature, and flow distribution to the reactor system analysis unit. The reactor system analysis unit transmits the coolant pressure vessel inlet temperature and flow to the computational fluid dynamics analysis unit, which in turn transmits the coolant core inlet flow to the core thermal subchannel calculation unit.

[0033] Figure 2 A diagram showing the interaction between coupled modules at each simulation level. Data exchange between coupled modules at different simulation levels allows for partial or full iteration as needed.

[0034] Specifically, the fuel material-level multi-disciplinary coupling module considers the internal details of the material, such as atoms and molecules, and models and calculates locally representative fuel materials. Starting from the first principles of materials science, through atomic-scale (nanoscale) and mesoscale (micrometer-to-millimeter scale) modeling and cross-scale data transfer, it calculates fuel material parameters (including thermal conductivity, specific heat capacity, elastic modulus, and Poisson's ratio, etc.) that take into account irradiation effects, and provides the fuel material parameters to the element-level multi-disciplinary coupling module, the assembly-level multi-disciplinary coupling module, and the core-level multi-disciplinary coupling module. The element-level multi-disciplinary coupling module no longer considers the internal details of the material, such as atoms and molecules, but instead treats the fuel material as a continuous medium and models and calculates individual fuel elements. It uses the fuel material parameters provided by the fuel material-level multi-disciplinary coupling module or physical test measurements, and the service parameters of representative fuel elements or fuel elements of interest (including power history, coolant temperature, and coolant flow) provided by the core-level multi-disciplinary coupling module to calculate the fuel element performance parameters (including detailed temperature field, stress-strain field, and fission gas concentration field). It also provides parameters such as the fuel effective temperature (calculated based on the fuel element detailed temperature field) to the core-level multi-disciplinary coupling module. The assembly-level multi-disciplinary coupling module no longer considers the internal details of the fuel element and models and calculates a single fuel assembly. It uses the fuel material parameters provided by the fuel material-level multi-disciplinary coupling module or physical test measurements, and the service parameters of representative fuel assemblies or fuel assemblies of interest provided by the core-level multi-disciplinary coupling module (including power history, coolant temperature, coolant flow rate, and assembly boundary neutron flux albedo distribution, etc.) to calculate the performance parameters of the fuel assembly (including temperature field and stress-strain field, etc.), and provides the geometric deformation in the stress-strain field (obtained from the strain field) to the core-level multi-disciplinary coupling module. The core-level multi-discipline coupling module no longer directly considers the reactor fuel, but instead homogenizes each fuel element segment by segment. It then models and calculates the entire core using the fuel material parameters provided by the fuel material-level multi-discipline coupling module or physical test measurements, the fuel effective temperatures of various fuel elements at different burnup depths and power levels provided by the element-level multi-discipline coupling module, the deformations of various fuel assemblies at different burnup depths, power levels, and burnup gradients provided by the assembly-level multi-discipline coupling module, and the core coolant inlet temperature, flow rate, and pressure distributions provided by the system-level multi-discipline coupling module. It calculates performance parameters such as the core power distribution, neutron flux distribution, burnup distribution, and temperature distribution, and provides the core burnup distribution and equivalent homogenization parameters of each fuel assembly (calculated based on the neutron flux distribution and nuclear data (input for reactor physics calculations)) to the system-level multi-discipline coupling module. The system-level multi-disciplinary coupling module no longer directly considers the reactor fuel specialty, and performs certain homogenization treatment on each fuel assembly in sections, but models and calculates the entire reactor system including the core and loop system; using the core fuel consumption distribution and equivalent homogenization parameters of each fuel assembly provided by the core-level multi-disciplinary coupling module, it calculates the three-dimensional distribution of temperature, flow, and pressure of the coolant in the reactor pressure vessel and the one-dimensional distribution of temperature, flow, and pressure in the loop system, and provides the two-dimensional distribution of temperature, flow, and pressure of the coolant at key parts of the pressure vessel and the core inlet to the core-level multi-disciplinary coupling module.

[0035] This invention divides the entire reactor system into multiple simulation levels, stratified by scale. Smaller simulation levels use more sophisticated specialized computational models, while larger levels use coarser models, even omitting some specialized models. Data is then exchanged between coupled modules at different levels. This solves the computational complexity associated with improved accuracy in digital reactor coupled simulations. This significantly reduces the computational complexity while also significantly improving accuracy.

[0036] Example 2 The difference between this embodiment and embodiment 1 is that this embodiment provides a digital reactor multi-level multi-physics simulation method. This simulation method is based on the digital reactor multi-level multi-physics simulation system of embodiment 1. The simulation method includes: The simulation levels of the entire reactor system are divided into five simulation levels from small to large, namely: fuel material level multi-professional coupling module, component level multi-professional coupling module, assembly level multi-professional coupling module, core level multi-professional coupling module, and system level multi-professional coupling module; The coupling modules at different simulation levels communicate with each other and implement partial or full iteration to exchange data between the coupling modules as needed; Among them, the coupling module of each simulation level includes multiple professional computing units, and the simulation computing majors of the professional computing units include reactor fuel major, reactor physics major, and reactor thermal fluid and safety analysis major.

[0037] As a further implementation, the simulation computing specialty considers multiple physical models and solution algorithms according to the level of model sophistication, forming different professional computing units, including: For the reactor fuel specialty, it is divided into atomic scale parameter calculation unit, mesoscale microstructure evolution simulation calculation unit, fuel performance macroscopic calculation unit and fuel assembly irradiation deformation calculation unit according to the model sophistication from high to low. Among them, the atomic scale parameter calculation unit includes the first principle calculation unit and the molecular dynamics calculation unit, and the mesoscale microstructure evolution simulation calculation unit includes the phase field method calculation unit, the rate theory calculation unit, the dislocation dynamics calculation unit and the dynamic Monte Carlo calculation unit. For reactor physics majors, the calculation units are divided into resonance-transport-burnup calculation unit and diffusion-burnup calculation unit according to the model sophistication from high to low. For the reactor thermal fluid and safety analysis major, it is divided into computational fluid dynamics unit, core thermal sub-channel calculation unit and reactor system analysis unit according to the model precision from high to low.

[0038] As a further implementation, the smaller the simulation level of the coupling module, the more specialized computing units with higher model sophistication are used, and vice versa, the less specialized computing units with lower model sophistication are used or even some specialized computing units are ignored, including: The fuel material-level multi-disciplinary coupling module includes an atomic-scale parameter calculation unit, a mesoscopic-scale microstructure evolution simulation calculation unit, and a fuel performance macroscopic calculation unit; The component-level multi-disciplinary coupling module includes a fuel performance macro calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit; The component-level multi-disciplinary coupling module includes the fuel assembly irradiation deformation calculation unit, the resonance-transport-burnup calculation unit, and the computational fluid dynamics unit; The core-level multi-disciplinary coupling module includes the resonance-transport-burnup calculation unit and the core thermal sub-channel calculation unit; The system-level multi-disciplinary coupling module includes a diffusion-burnup calculation unit (a resonance-transport-burnup calculation unit is used under special requirements), a computational fluid dynamics unit, a core thermal sub-channel calculation unit, and a reactor system analysis unit.

[0039] At the same time, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the above-mentioned digital reactor multi-level multi-physics simulation method is implemented.

[0040] At the same time, the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the above-mentioned digital reactor multi-level multi-physics simulation method.

[0041] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0042] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0043] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0044] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0045] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A digital reactor multi-level multi-physics simulation system, characterized by: The system divides the simulation levels of the entire reactor system into five simulation levels according to the scale from small to large, namely: fuel material level multi-professional coupling module, component level multi-professional coupling module, assembly level multi-professional coupling module, core level multi-professional coupling module, and system level multi-professional coupling module; The coupling modules at different simulation levels are communicated with each other; the coupling modules at each simulation level include multiple professional computing units, and the simulation computing specialties of the professional computing units include reactor fuel specialties, reactor physics specialties, and reactor thermal fluid and safety analysis specialties.

2. The digital reactor multi-level multi-physics simulation system according to claim 1, characterized in that: The simulation computing specialty considers multiple physical models and solution algorithms according to the level of model sophistication, forming different specialized computing units, including: For the reactor fuel specialty, it is divided into atomic scale parameter calculation unit, mesoscale microstructure evolution simulation calculation unit, fuel performance macroscopic calculation unit and fuel assembly irradiation deformation calculation unit according to the model precision from high to low; among them, the atomic scale parameter calculation unit includes the first principle calculation unit and the molecular dynamics calculation unit, and the mesoscale microstructure evolution simulation calculation unit includes the phase field method calculation unit, the rate theory calculation unit, the dislocation dynamics calculation unit and the dynamic Monte Carlo calculation unit; For the reactor physics specialty, the model is divided into resonance-transport-burnup calculation unit and diffusion-burnup calculation unit according to the degree of model sophistication from high to low; For the reactor thermal fluid and safety analysis major, it is divided into computational fluid dynamics unit, core thermal sub-channel calculation unit and reactor system analysis unit according to the model sophistication from high to low.

3. The digital reactor multi-level multi-physics simulation system according to claim 1, characterized in that: The smaller the simulation level scale of the coupling module is, the more specialized computing units with a higher model precision are used; conversely, the less specialized computing units with a lower model precision are used or even some specialized computing units are ignored.

4. The digital reactor multi-level multi-physics simulation system according to claim 3, characterized in that: Coupling modules at different simulation levels, including: The fuel material-level multi-disciplinary coupling module includes an atomic-scale parameter calculation unit, a mesoscopic-scale microstructure evolution simulation calculation unit, and a fuel performance macroscopic calculation unit; The component-level multi-disciplinary coupling module includes a fuel performance macro calculation unit, a resonance-transport-burn calculation unit, and a computational fluid dynamics unit; The component-level multi-disciplinary coupling module includes a fuel assembly irradiation deformation calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit; The core-level multi-disciplinary coupling module includes a resonance-transport-burnup calculation unit and a core thermal sub-channel calculation unit; The system-level multi-disciplinary coupling module includes a diffusion-burnup calculation unit, a computational fluid dynamics unit, a core thermal sub-channel calculation unit and a reactor system analysis unit.

5. The digital reactor multi-level multi-physics simulation system according to claim 1, characterized in that: The smaller the simulation level scale of the coupling module and the smaller the modeling scope, the more refined the modeling, including: The fuel material-level multi-disciplinary coupling module considers the internal details of atoms and molecules in the material and models and calculates local representative fuel materials; The component-level multi-disciplinary coupling module no longer considers the internal details of atoms and molecules in the material, but instead regards the fuel material as a continuous medium and models and calculates individual fuel elements; The component-level multi-disciplinary coupling module no longer considers the internal details of the fuel element and models and calculates a single fuel assembly; The core-level multi-discipline coupling module no longer directly considers the reactor fuel discipline, but instead homogenizes each fuel element in sections. By equivalently considering the radially uneven distribution of the fuel elements through the fuel effective temperature, the entire core is modeled and calculated. The system-level multi-disciplinary coupling module no longer directly considers the reactor fuel discipline, and instead divides each fuel assembly into sections for homogenization, and models and calculates the entire reactor system including the core and loop system.

6. The digital reactor multi-level multi-physics simulation system according to claim 1, characterized in that: The communication between coupling modules at different simulation levels is connected, and partial or full iteration is implemented as needed to exchange data between coupling modules. Specifically, it includes: The fuel material level multi-disciplinary coupling module calculates the fuel material parameters taking into account the irradiation effect and provides the fuel material parameters to the element level multi-disciplinary coupling module, the assembly level multi-disciplinary coupling module and the core level multi-disciplinary coupling module; The element-level multi-discipline coupling module calculates the performance parameters of the fuel elements using the fuel material parameters provided by the fuel material-level multi-discipline coupling module or the physical test measurements, and the service parameters of the representative fuel elements or the fuel elements of interest provided by the core-level multi-discipline coupling module, and provides the performance parameters of the fuel elements to the core-level multi-discipline coupling module; The assembly-level multi-disciplinary coupling module calculates the performance parameters of the fuel assembly using the fuel material parameters provided by the fuel material-level multi-disciplinary coupling module or the physical test measurement, and the service parameters of the representative fuel assembly or the fuel assembly of interest provided by the core-level multi-disciplinary coupling module, and provides the fuel assembly performance parameters to the core-level multi-disciplinary coupling module; The core-level multi-disciplinary coupling module calculates the core performance parameters using the fuel material parameters provided by the fuel material-level multi-disciplinary coupling module or physical test measurements, the fuel effective temperatures of various fuel elements at different burnup depths and power levels provided by the element-level multi-disciplinary coupling module, the deformations of various fuel assemblies at different burnup depths, power levels and burnup gradients provided by the assembly-level multi-disciplinary coupling module, and the core coolant distribution provided by the system-level multi-disciplinary coupling module. The core performance parameters and fuel assembly performance parameters are then provided to the system-level multi-disciplinary coupling module. The system-level multi-disciplinary coupling module uses the core performance parameters and fuel assembly performance parameters provided by the core-level multi-disciplinary coupling module to calculate the three-dimensional distribution of temperature, flow, and pressure of the coolant in the reactor pressure vessel and the one-dimensional distribution of temperature, flow, and pressure in the loop system, and provides the two-dimensional distribution of temperature, flow, and pressure of the coolant at key parts of the pressure vessel and the core inlet to the core-level multi-disciplinary coupling module.

7. The digital reactor multi-level multi-physics simulation system according to claim 6, characterized in that: The fuel material parameters include thermal conductivity, specific heat capacity, elastic modulus and Poisson's ratio; The fuel element service parameters include power history, coolant temperature, and coolant flow rate; The performance parameters of the fuel element include fine temperature field, stress-strain field and fission gas concentration field; The service parameters of the fuel assembly include power history, coolant temperature, coolant flow rate, and assembly boundary neutron flux albedo distribution; The performance parameters of the fuel assembly include temperature field and stress-strain field; The core performance parameters include power distribution, neutron flux distribution, burnup distribution and temperature distribution.

8. A multi-level and multi-physics simulation method for a digital reactor, characterized in that: The simulation method includes: The simulation levels of the entire reactor system are divided into five simulation levels from small to large, namely: fuel material level multi-professional coupling module, component level multi-professional coupling module, assembly level multi-professional coupling module, core level multi-professional coupling module, and system level multi-professional coupling module; The coupling modules at different simulation levels communicate with each other and implement partial or full iteration to exchange data between the coupling modules as needed; Among them, the coupling module of each simulation level includes multiple professional computing units, and the simulation computing specialties of the professional computing units include reactor fuel specialties, reactor physics specialties, and reactor thermal fluid and safety analysis specialties.

9. The digital reactor multi-level multi-physics simulation method according to claim 8, characterized in that: The simulation computing specialty considers multiple physical models and solution algorithms according to the level of model sophistication, forming different specialized computing units, including: For the reactor fuel specialty, it is divided into atomic scale parameter calculation unit, mesoscale microstructure evolution simulation calculation unit, fuel performance macroscopic calculation unit and fuel assembly irradiation deformation calculation unit according to the model precision from high to low; among them, the atomic scale parameter calculation unit includes the first principle calculation unit and the molecular dynamics calculation unit, and the mesoscale microstructure evolution simulation calculation unit includes the phase field method calculation unit, the rate theory calculation unit, the dislocation dynamics calculation unit and the dynamic Monte Carlo calculation unit; For the reactor physics specialty, the model is divided into resonance-transport-burnup calculation unit and diffusion-burnup calculation unit according to the degree of model sophistication from high to low; For the reactor thermal fluid and safety analysis major, it is divided into computational fluid dynamics unit, core thermal sub-channel calculation unit and reactor system analysis unit according to the model sophistication from high to low.

10. The digital reactor multi-level multi-physics simulation method according to claim 8, characterized in that: The smaller the simulation level scale of the coupling module, the more specialized computing units with a higher model precision are used. Conversely, the less refined the model, the less specialized computing units are used or even some specialized computing units are ignored, including: The fuel material-level multi-disciplinary coupling module includes an atomic-scale parameter calculation unit, a mesoscopic-scale microstructure evolution simulation calculation unit, and a fuel performance macroscopic calculation unit; The component-level multi-disciplinary coupling module includes a fuel performance macro calculation unit, a resonance-transport-burn calculation unit, and a computational fluid dynamics unit; The component-level multi-disciplinary coupling module includes a fuel assembly irradiation deformation calculation unit, a resonance-transport-burnup calculation unit, and a computational fluid dynamics unit; The core-level multi-disciplinary coupling module includes a resonance-transport-burnup calculation unit and a core thermal sub-channel calculation unit; The system-level multi-disciplinary coupling module includes a diffusion-burnup calculation unit, a computational fluid dynamics unit, a core thermal sub-channel calculation unit and a reactor system analysis unit.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the digital reactor multi-level multi-physics simulation method according to any one of claims 8 to 10 is implemented.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the digital reactor multi-level multi-physics simulation method according to any one of claims 8 to 10 is implemented.

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