Modeling method, system and equipment of reactor system and medium

Abstract

The invention relates to the field of nuclear energy system simulation, in particular to a modeling method, system, equipment and medium of a reactor system, and the modeling method comprises the following steps: constructing three-dimensional models for main loop equipment according to structural parameters of the main loop equipment, and connecting all the three-dimensional models according to a topological structure; a fluid domain of the main loop is divided into a plurality of sub-domain control bodies; selecting a grid type according to the geometric dimension of each sub-domain control body, and dividing the sub-domain control body into a plurality of grids; selecting a physical calculation model for the corresponding sub-domain control body according to the physical characteristics and the grid structure of the fluid; setting boundary conditions according to a predefined system power function; constructing a to-be-adjusted model based on the grid, the physical calculation model and the boundary condition; and verifying and adjusting the to-be-adjusted model to obtain a system model of the reactor system. According to the method, more accurate and detailed simulation results can be provided, and the method has important value and significance for optimizing the design and operation of the reactor and improving the performance and safety of the reactor.

Description

Technical Field

[0001] The present invention relates to the field of nuclear energy system simulation, and in particular to a modeling method, system, equipment and medium for a reactor system. Background Art

[0002] like Figure 1 As shown in the figure, the main circuit equipment of the integrated small reactor includes a pressure vessel, a core, a heat exchanger, etc., which are generally arranged in a compact manner. The main circuit equipment is arranged in the pressure vessel to form a highly integrated main circuit system. For a small reactor driven by natural circulation, the coolant flow is driven by the density difference caused by the low-position core (heat source) and the high-position heat exchanger (cold source). There is a complex three-dimensional natural convection effect in the natural circulation process of the main circuit. The three-dimensional effect in the main circuit is more obvious under conditions such as power increase and asymmetric operation of the intermediate circuit, which directly affects the natural circulation capacity and thermal hydraulic state of the main circuit, and is crucial to reactor safety. It is necessary to carry out high-fidelity three-dimensional thermal hydraulic analysis of the main circuit of a small reactor.

[0003] The system-level thermal-hydraulic analysis of nuclear power plants mainly adopts special programs. These special programs mostly use one-dimensional coarse grid models, which cannot describe the complex three-dimensional multi-scale turbulent flow behavior and thermal-hydraulic characteristics, and therefore cannot obtain detailed temperature field, flow field and other information. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a modeling method, system, equipment and medium for a reactor system.

[0005] A first aspect of the present invention discloses a modeling method for a reactor system, comprising:

[0006] According to the structural parameters of each main loop device of the reactor system, a three-dimensional model is constructed for it, and all the three-dimensional models are connected according to the topological structure of the reactor system;

[0007] Based on the three-dimensional model, the fluid domain of the main loop is obtained, and the fluid domain of the main loop is divided into a plurality of sub-domain control bodies; wherein the fluid domain of the main loop refers to the area where the fluid flows in the main loop;

[0008] Selecting a grid type according to the geometric size of each subdomain control volume to divide it into a plurality of grids;

[0009] According to the physical properties of the fluid and the grid structure, a physical calculation model is selected for the corresponding subdomain control volume;

[0010] Set boundary conditions based on predefined system power functions;

[0011] Constructing a model to be adjusted based on the grid, the physical calculation model and the boundary conditions;

[0012] The model to be adjusted is verified and adjusted to obtain a system model of the reactor system.

[0013] Furthermore, based on the three-dimensional model, the steps of obtaining the fluid domain of the main loop and dividing the fluid domain of the main loop into a plurality of sub-domain control volumes include:

[0014] Based on the three-dimensional model, obtaining the fluid domain of the main circuit;

[0015] According to the equipment corresponding to the heat source area and cold source area of ​​the main loop, the fluid domain of the main loop is divided into multiple sub-domain control bodies.

[0016] Furthermore, the sub-domain control body includes: a core sub-domain control body for a fuel assembly of the core, a heat exchanger sub-domain control body for a heat exchanger, a descending annular cavity sub-domain control body, a bottom chamber sub-domain control body, an upper chamber sub-domain control body and a pressure stabilization sub-domain control body.

[0017] Furthermore, the step of selecting a grid type according to the geometric size of each sub-domain control volume and dividing it into a plurality of grids includes:

[0018] For each face of each subdomain control volume:

[0019] selecting at least one mesh type based on geometric characteristics of the surface;

[0020] Based on the grid type, dividing it into a plurality of grids;

[0021] Determine whether the surface is an interface with other subdomain control volumes:

[0022] If so, all the grids are adjusted according to the grids of the interfaces of the other sub-domain control volumes.

[0023] Furthermore, the system power function corresponding to the core is:

[0024]

[0025] Among them, W_out ij is the heat release power function of the i-th fuel assembly at the j-th life cycle, a ij is the power factor of the i-th fuel assembly at the j-th life cycle, W FA is the total heat release power of the core, n is the number of fuel assemblies;

[0026] And, according to the predefined system power function, the step of setting the boundary conditions includes:

[0027] Calculate the heat release power function W_out for each fuel assembly ij ;

[0028] According to the volume of the fuel assembly and the heat release power function W_out ij , calculate the heat flux density per unit volume of the fuel assembly;

[0029] The heat flux density per unit volume is used as the heat flux boundary condition of the heat source area of ​​the main loop.

[0030] Furthermore, the system power function corresponding to the heat exchanger is:

[0031]

[0032] Among them, W_in km is the heat absorption power function of the kth heat exchanger in the mth operating state, b km is the power factor of the kth heat exchanger in the nth operating state, W HE is the total heat absorption power of all heat exchangers, r is the number of heat exchangers;

[0033] And, according to the predefined system power function, the step of setting the boundary conditions includes:

[0034] Calculate the heat absorption power function W_in of each heat exchanger km ;

[0035] According to the volume of the heat exchanger and the heat absorption power function W_in km , calculate the heat flux density per unit volume of the heat exchanger;

[0036] The heat flux density per unit volume is used as the heat flux boundary condition of the cold source area of ​​the main loop.

[0037] Furthermore, the step of verifying and adjusting the model to be adjusted to obtain a system model of the reactor system includes:

[0038] Calculate the specified parameters of the reactor system based on the model to be adjusted: main circuit flow, heat source inlet and outlet temperature, cold source inlet and outlet temperature, main circuit pressure drop;

[0039] Comparing the specified parameter with a given comparison value to obtain a parameter difference;

[0040] Determining whether the parameter difference is less than a preset threshold;

[0041] If it is less than, determining the model to be adjusted as the system model of the reactor system;

[0042] Otherwise, adjust the model to be adjusted.

[0043] A second aspect of the present invention discloses a modeling system for a reactor system, comprising:

[0044] A first construction module is used to construct a three-dimensional model for each main loop device of the reactor system according to the structural parameters thereof, and connect all the three-dimensional models according to the topological structure of the reactor system;

[0045] A segmentation module, used for obtaining the fluid domain of the main loop based on the three-dimensional model, and segmenting the fluid domain of the main loop into a plurality of sub-domain control bodies; wherein the fluid domain of the main loop refers to the area where the fluid flows in the main loop;

[0046] A division module, used for selecting a grid type according to the geometric size of each sub-domain control volume, and dividing it into a plurality of grids;

[0047] A selection module is used to select a physical calculation model for a corresponding subdomain control volume according to the physical properties of the fluid and the grid structure;

[0048] A setting module, used to set boundary conditions according to a predefined system power function;

[0049] A second construction module, used to construct a model to be adjusted based on the grid, the physical calculation model and the boundary conditions;

[0050] The adjustment module is used to verify and adjust the model to be adjusted to obtain a system model of the reactor system.

[0051] The third aspect of the present invention discloses an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the reactor system modeling method as described in any one of the first aspect of the present invention when executing the computer program.

[0052] The fourth aspect of the present invention discloses a storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the reactor system modeling method as described in any one of the first aspect of the present invention.

[0053] The modeling method of the reactor system provided by the invention can simulate and analyze complex three-dimensional multi-scale turbulent flow behavior and thermal hydraulic characteristics more finely by selecting the grid type according to the geometric size of each sub-domain control volume and dividing it into multiple grids, so as to obtain more detailed information such as temperature field and flow field. Compared with the existing one-dimensional coarse grid model, this method can provide more accurate and detailed simulation results, which is of great value and significance for optimizing the design and operation of the reactor and improving the performance and safety of the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 It is a schematic diagram of the structure of an integrated small-scale reactor disclosed in the background technology of the present invention;

[0056] Figure 2 It is a flow chart of a modeling method of a reactor system disclosed in an embodiment of the present invention;

[0057] Figure 3 is a structural schematic diagram of a modeling system for a reactor system disclosed in an embodiment of the present invention;

[0058] Figure 4 It is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, device, or product end including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0061] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] The present invention adopts partition grid division and interface grid mapping, generates grid units of each sub-domain control volume through different grid division strategies, and ensures that the grid nodes on the interface of different regions are consistent, reduces data interpolation errors, and ensures the accuracy of data transmission in different regions.

[0063] See also Figure 2 As shown, Figure 2 Schematic diagram of a modeling method of a reactor system disclosed in an embodiment of the present invention. Figure 2 As shown, the modeling method of the reactor system may include the following operations:

[0064] S201, constructing a three-dimensional model for each main loop device of the reactor system according to the structural parameters thereof, and connecting all the three-dimensional models according to the topological structure of the reactor system;

[0065] In this optional embodiment, the reactor system is a device for producing and controlling nuclear reactions. In a typical reactor, atomic nuclei can absorb neutrons and undergo fission (i.e., splitting), releasing a large amount of energy in the process. The reactor design must ensure that this process can be carried out in a controlled environment.

[0066] In a reactor system, the primary loop is a closed coolant circulation system that directly contacts the nuclear fuel of the reactor and is used to transfer the heat energy released by the reactor. The primary loop equipment may include the reactor pressure vessel, fuel assembly, control rods, heat exchanger, reactor internals, etc.

[0067] A 3D model is a digital representation of an object in the physical world. It is created in three-dimensional space and includes the width, height, and depth of the object. The 3D model can be constructed using tools such as Spaceclaim, DesignModeler, SolidWorks, etc., and the present invention does not limit this.

[0068] Connecting all the three-dimensional models according to the topological structure of the reactor system means connecting the corresponding three-dimensional models according to the direct interface relationship of each device in the topological structure of the reactor system.

[0069] S202, based on the three-dimensional model, obtaining the fluid domain of the main loop, and dividing the fluid domain of the main loop into a plurality of sub-domain control volumes; wherein the fluid domain of the main loop refers to the area where the fluid flows in the main loop;

[0070] In an optional embodiment, based on the three-dimensional model, the step of acquiring the fluid domain of the main loop and dividing the fluid domain of the main loop into a plurality of sub-domain control volumes includes:

[0071] Based on the three-dimensional model, obtaining the fluid domain of the main circuit;

[0072] According to the equipment corresponding to the heat source area and cold source area of ​​the main loop, the fluid domain of the main loop is divided into multiple sub-domain control bodies.

[0073] In this optional embodiment, the fluid domain of the primary loop refers to the space occupied by the coolant flowing in the primary loop. When simulating and analyzing the operation of the primary loop, the fluid domain is an important part, which covers all areas where the coolant flows, including the space inside the reactor and inside the heat exchanger and other equipment. The size and shape of the fluid domain will affect the flow of the coolant, and thus affect the operating status and safety of the reactor.

[0074] In an optional embodiment, the sub-domain control body includes: a core sub-domain control body for a fuel assembly of the core, a heat exchanger sub-domain control body for a heat exchanger, a descending annulus sub-domain control body, a bottom chamber sub-domain control body, an upper chamber sub-domain control body and a pressure stabilizing sub-domain control body.

[0075] S203, selecting a grid type according to the geometric size of each sub-domain control volume, and dividing it into a plurality of grids;

[0076] In this optional embodiment, the control body refers to the various small areas that divide the fluid area in the computational fluid dynamics simulation. The core subdomain control body of a fuel assembly in the core simulates the fluid flow and heat transfer behavior in the fuel assembly. The heat exchanger subdomain control body of a heat exchanger, the function of the heat exchanger is to transfer the heat energy from the core to the working fluid of the secondary circuit, and the heat exchanger subdomain control body simulates the fluid flow and heat exchange behavior in the heat exchanger. The downcomer subdomain control body simulates the flow behavior of the coolant in the downcomer. The bottom chamber subdomain control body simulates the flow behavior of the coolant in the bottom chamber, the upper chamber subdomain control body simulates the flow behavior of the coolant in the upper chamber, and the pressure stabilization subdomain control body simulates the flow behavior of the coolant in the pressure stabilization link.

[0077] In an optional embodiment, the step of selecting a grid type according to the geometric size of each sub-domain control volume and dividing it into a plurality of grids comprises:

[0078] For each face of each subdomain control volume:

[0079] selecting at least one mesh type based on geometric characteristics of the surface;

[0080] Based on the grid type, dividing it into a plurality of grids;

[0081] Determine whether the surface is an interface with other subdomain control volumes:

[0082] If so, all the grids are adjusted according to the grids of the interfaces of the other sub-domain control volumes.

[0083] In an optional embodiment, the mesh type is selected according to the geometric size characteristics of different subdomain control bodies, and the mesh types include: triangular prism, tetrahedron, hexahedron, polyhedron, pyramid, etc. Each subdomain control body is divided into meshes, and the spatial distribution of mesh nodes on the interface of different subdomain control bodies remains completely consistent. The mesh types of different faces of each subdomain control body can be the same or different, and the present invention does not limit this.

[0084] In this embodiment, adjusting all the grids according to the grids of the interfaces of the other sub-domain control bodies refers to adjusting all the grids according to the grids of the interfaces of the other sub-domain control bodies so that all endpoints of each grid are aligned.

[0085] S204, selecting a physical calculation model for the corresponding subdomain control volume according to the physical properties of the fluid and the grid structure;

[0086] In this optional embodiment, the physical calculation model may include: turbulence model, two-phase flow model, porous medium model, wall function, medium physical properties, etc. And according to the specific working conditions to be analyzed, reasonable calculation domain initial value parameters are set.

[0087] S205, setting boundary conditions according to a predefined system power function;

[0088] In an optional embodiment, the system power function corresponding to the core is:

[0089]

[0090] Among them, W_out ij is the heat release power function of the i-th fuel assembly at the j-th life cycle, a ij is the power factor of the i-th fuel assembly at the j-th life cycle, W FA is the total heat release power of the core, n is the number of fuel assemblies;

[0091] And, according to the predefined system power function, the step of setting the boundary conditions includes:

[0092] Calculate the heat release power function W_out for each fuel assembly ij ;

[0093] According to the volume of the fuel assembly and the heat release power function W_out ij , calculate the heat flux density per unit volume of the fuel assembly;

[0094] The heat flux density per unit volume is used as the heat flux boundary condition of the heat source area of ​​the main loop.

[0095] In another optional embodiment, the system power function corresponding to the heat exchanger is:

[0096]

[0097] Among them, W_in km is the heat absorption power function of the kth heat exchanger in the mth operating state, b km is the power factor of the kth heat exchanger in the mth operating state, W HE is the total heat absorption power of all heat exchangers, r is the number of heat exchangers;

[0098] And, according to the predefined system power function, the step of setting the boundary conditions includes:

[0099] Calculate the heat absorption power function W_in of each heat exchanger km ;

[0100] According to the volume of the heat exchanger and the heat absorption power function W_in km , calculate the heat flux density per unit volume of the heat exchanger;

[0101] The heat flux density per unit volume is used as the heat flux boundary condition of the cold source area of ​​the main loop.

[0102] In this optional embodiment, boundary conditions refer to the behavior of a physical system at its boundary (or edge). In numerical simulation and computational fluid dynamics (CFD), boundary conditions define the state of a physical system at the boundary of a simulation area. For example, in a fluid dynamics simulation, boundary conditions specify the velocity, pressure, temperature, etc. of a fluid at the boundary.

[0103] S206, constructing a model to be adjusted based on the grid, the physical calculation model and the boundary conditions;

[0104] In this optional embodiment, the physical model is an abstraction and idealization of the actual physical process, which includes various physical phenomena such as fluid dynamics, heat conduction, nuclear physics, etc. The boundary conditions describe the state of the physical system on the boundary of the subdomain control volume, and provide necessary additional information for solving the physical model. Based on the grid, the physical calculation model and the boundary conditions, the model to be adjusted is constructed. Under the given boundary conditions and grid division, the numerical method can be used to solve the physical model and obtain a preliminary solution to the physical problem.

[0105] S207, verifying and adjusting the model to be adjusted to obtain a system model of the reactor system.

[0106] In an optional embodiment, the step of verifying and adjusting the model to be adjusted to obtain a system model of the reactor system includes:

[0107] Calculate the specified parameters of the reactor system based on the model to be adjusted: main circuit flow, heat source inlet and outlet temperature, cold source inlet and outlet temperature, main circuit pressure drop;

[0108] Comparing the specified parameter with a given comparison value to obtain a parameter difference;

[0109] Determining whether the parameter difference is less than a preset threshold;

[0110] If it is less than, determining the model to be adjusted as the system model of the reactor system;

[0111] Otherwise, adjust the model to be adjusted.

[0112] In this optional embodiment, the given comparison value may be a calculation result of an existing system program or a test result, and the present invention does not limit this.

[0113] The adjusting of the model to be adjusted refers to adjusting the grid and boundary conditions of the subdomain control volume.

[0114] In an optional embodiment, the system model of the reactor system can be used to calculate operating parameters, such as partial loop operation, start-up and shutdown transients, etc. The calculation of different operating parameters requires modifying boundary conditions according to the operating conditions.

[0115] like Figure 3 As shown, the present invention provides a modeling system for a reactor system, comprising:

[0116] The first construction module 301 is used to construct a three-dimensional model for each main loop device of the reactor system according to the structural parameters thereof, and connect all the three-dimensional models according to the topological structure of the reactor system;

[0117] The segmentation module 302 is used to obtain the fluid domain of the main loop based on the three-dimensional model, and segment the fluid domain of the main loop into multiple sub-domain control volumes; wherein the fluid domain of the main loop refers to the area where the fluid flows in the main loop;

[0118] A division module 303 is used to select a grid type according to the geometric size of each sub-domain control volume and divide it into multiple grids;

[0119] A selection module 304 is used to select a physical calculation model for a corresponding subdomain control volume according to the physical characteristics of the fluid and the grid structure;

[0120] A setting module 305, used to set boundary conditions according to a predefined system power function;

[0121] A second construction module 306 is used to construct a model to be adjusted based on the grid, the physical calculation model and the boundary conditions;

[0122] The adjustment module 307 is used to verify and adjust the model to be adjusted to obtain a system model of the reactor system.

[0123] The specific definition of the modeling system of the reactor system can be found in the definition of the modeling method of the reactor system above, which will not be repeated here. Each module in the above-mentioned modeling system of the reactor system can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the electronic device in hardware format, or can be stored in the memory of the electronic device in software format, so that the processor can call the operations corresponding to the above modules.

[0124] It should be noted that, in order to highlight the innovative part of the present invention, the present embodiment does not introduce modules that are not closely related to solving the technical problem proposed by the present invention, but this does not mean that there are no other modules in the present embodiment.

[0125] like Figure 4 The electronic device 1 provided by the present invention may include a memory 12, a processor 13 and a bus, and may also include a computer program stored in the memory 12 and executable on the processor 13, such as a modeling program for a reactor system.

[0126] Among them, the memory 12 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (for example: SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. The memory 12 can be an internal storage unit of the electronic device 1 in some embodiments, such as a mobile hard disk of the electronic device 1. The memory 12 can also be an external storage device of the electronic device 1 in other embodiments, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 1. Further, the memory 12 can also include both an internal storage unit of the electronic device 1 and an external storage device. The memory 12 can not only be used to store application software and various types of data installed in the electronic device 1, such as the modeling code of the reactor system, but also can be used to temporarily store data that has been output or is to be output.

[0127] In some embodiments, the processor 13 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 13 is the control core (Control Unit) of the electronic device 1, and uses various interfaces and lines to connect various components of the entire electronic device 1, and executes or executes programs or modules (such as a modeling program for a reactor system, etc.) stored in the memory 12, and calls data stored in the memory 12 to execute various functions of the electronic device 1 and process data.

[0128] The processor 13 executes the operating system and various installed application programs of the electronic device 1. The processor 13 executes the application programs to implement the steps in the above-mentioned reactor system modeling method.

[0129] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory 12 and executed by the processor 13 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program in the electronic device 1. For example, the computer program may be divided into a first construction module 301, a segmentation module 302, a division module 303, a selection module 304, a setting module 305, a second construction module 306, and an adjustment module 307.

[0130] The above-mentioned integrated unit implemented in the form of a software function module can be stored in a computer-readable storage medium, and the storage medium can be non-volatile or volatile. The above-mentioned software function module is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a computer device, or a network device, etc.) or a processor to perform part of the functions of the modeling method of the reactor system described in each embodiment of the present application.

[0131] In one embodiment, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps implemented when the processor executes the computer program can also be implemented.

[0132] In summary, the modeling method, system, device and medium of a reactor system disclosed in the present invention can provide more accurate and detailed simulation results compared with the existing one-dimensional coarse grid model, and has important value and significance for optimizing the design and operation of the reactor and improving the performance and safety of the reactor. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0133] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A modeling method for a reactor system, characterized in that: The method comprises: According to the structural parameters of each main loop device of the reactor system, a three-dimensional model is constructed for it, and all the three-dimensional models are connected according to the topological structure of the reactor system; Based on the three-dimensional model, the fluid domain of the main loop is obtained, and the fluid domain of the main loop is divided into a plurality of sub-domain control bodies; wherein the fluid domain of the main loop refers to the area where the fluid flows in the main loop; Selecting a grid type according to the geometric size of each subdomain control volume and dividing it into a plurality of grids; According to the physical properties of the fluid and the grid structure, a physical calculation model is selected for the corresponding subdomain control volume; Set boundary conditions based on predefined system power functions; Constructing a model to be adjusted based on the grid, the physical calculation model and the boundary conditions; The model to be adjusted is verified and adjusted to obtain a system model of the reactor system.

2. A reactor system modeling method according to claim 1, characterized in that: Based on the three-dimensional model, the steps of obtaining the fluid domain of the main loop and dividing the fluid domain of the main loop into a plurality of sub-domain control volumes include: Based on the three-dimensional model, obtaining the fluid domain of the main circuit; According to the equipment corresponding to the heat source area and cold source area of ​​the main loop, the fluid domain of the main loop is divided into multiple sub-domain control bodies.

3. A reactor system modeling method according to claim 2, characterized in that: The subdomain control bodies include: a core subdomain control body for a fuel assembly of the core, a heat exchanger subdomain control body for a heat exchanger, a downdraft annulus subdomain control body, a bottom chamber subdomain control body, an upper chamber subdomain control body and a pressure stabilization subdomain control body.

4. A reactor system modeling method according to claim 1, characterized in that: The step of selecting a mesh type according to the geometric size of each subdomain control volume and dividing it into a plurality of meshes comprises: For each face of each subdomain control volume: selecting at least one mesh type based on geometric characteristics of the surface; Based on the grid type, dividing it into a plurality of grids; Determine whether the surface is an interface with other subdomain control volumes: If so, all the grids are adjusted according to the grids of the interfaces of the other sub-domain control volumes.

5. A reactor system modeling method according to claim 1, characterized in that: The system power function corresponding to the core is: Among them, W_out ij is the heat release power function of the i-th fuel assembly at the j-th life cycle, a ij is the power factor of the i-th fuel assembly at the j-th life cycle, W FA is the total heat release power of the core, n is the number of fuel assemblies; And, according to the predefined system power function, the step of setting the boundary conditions includes: Calculate the heat release power function W_out for each fuel assembly ij ; According to the volume of the fuel assembly and the heat release power function W_out ij , calculate the heat flux density per unit volume of the fuel assembly; The heat flux density per unit volume is used as the heat flux boundary condition of the heat source area of ​​the main loop.

6. A reactor system modeling method according to claim 1, characterized in that: The system power function corresponding to the heat exchanger is: Among them, W_in km is the heat absorption power function of the kth heat exchanger in the mth operating state, b km is the power factor of the kth heat exchanger in the mth operating state, W HE is the total heat absorption power of all heat exchangers, r is the number of heat exchangers; And, according to the predefined system power function, the step of setting the boundary conditions includes: Calculate the heat absorption power function W_in of each heat exchanger km ; According to the volume of the heat exchanger and the heat absorption power function W_in km , calculate the heat flux density per unit volume of the heat exchanger; The heat flux density per unit volume is used as the heat flux boundary condition of the cold source area of ​​the main loop.

7. A reactor system modeling method according to claim 1, characterized in that: The step of verifying and adjusting the model to be adjusted to obtain a system model of the reactor system comprises: Calculate the specified parameters of the reactor system based on the model to be adjusted: main circuit flow, heat source inlet and outlet temperature, cold source inlet and outlet temperature, main circuit pressure drop; Comparing the specified parameter with a given comparison value to obtain a parameter difference; Determining whether the parameter difference is less than a preset threshold; If it is less than, determining the model to be adjusted as the system model of the reactor system; Otherwise, adjust the model to be adjusted.

8. A modeling system for a reactor system, characterized in that: include: A first construction module is used to construct a three-dimensional model for each main loop device of the reactor system according to the structural parameters thereof, and connect all the three-dimensional models according to the topological structure of the reactor system; A segmentation module, used for obtaining the fluid domain of the main loop based on the three-dimensional model, and segmenting the fluid domain of the main loop into a plurality of sub-domain control bodies; wherein the fluid domain of the main loop refers to the area where the fluid flows in the main loop; A division module, used for selecting a grid type according to the geometric size of each sub-domain control volume, and dividing it into a plurality of grids; A selection module is used to select a physical calculation model for a corresponding subdomain control volume according to the physical characteristics of the fluid and the grid structure; A setting module, used to set boundary conditions according to a predefined system power function; A second construction module, used to construct a model to be adjusted based on the grid, the physical calculation model and the boundary conditions; The adjustment module is used to verify and adjust the model to be adjusted to obtain a system model of the reactor system.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the reactor system modeling method according to any one of claims 1 to 7 are implemented.

10. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the reactor system modeling method according to any one of claims 1 to 7 are implemented.

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