Pool-type lead-bismuth fast reactor simulation method and related equipment

Abstract

The invention relates to the technical field of nuclear reactor simulation, in particular to a pool-type lead-bismuth fast reactor simulation method and related equipment, and the method comprises the following steps: constructing a pool-type lead-bismuth fast reactor simulation module library according to the structure of a pool-type lead-bismuth fast reactor; modules in the pool type lead-bismuth fast reactor simulation module library are connected according to a set sequence, and a pool type lead-bismuth fast reactor simulation model used for achieving main coolant circulation and secondary loop water supply is built; and after module parameters in the lead-bismuth fast reactor simulation module library are correspondingly set, the pool-type lead-bismuth fast reactor simulation model is operated, and building of the pool-type lead-bismuth fast reactor simulation platform is completed. Parameterization and modularization modeling are adopted, and small pool type lead bismuth fast reactors of different structures can be used.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear reactor simulation, and particularly relates to a simulation method for a pool-type lead-bismuth fast reactor and related equipment. Background Art

[0002] A lead-bismuth cooled fast reactor refers to a fast neutron fission nuclear reactor using lead-bismuth eutectic as a coolant. Lead-bismuth has become one of the main development directions of the six types of fourth-generation nuclear reactors due to its stable chemical properties, low melting point, high boiling point, etc. Compared with traditional pressurized water reactors, the boiling point of lead-bismuth eutectic is as high as 1670 °C, and there is no need to consider coolant boiling accidents. The primary loop can operate at atmospheric pressure, so a pressurizer is not required for the primary loop of the lead-bismuth fast reactor. Compared with sodium-cooled fast reactors, lead-bismuth has strong chemical inertness and does not react violently with air and water, so an intermediate loop protection is not required. Based on these two characteristics, lead-bismuth fast reactors are more easily miniaturized.

[0003] Miniature lead-bismuth fast reactors are mostly used as mobile power sources, power supplies for remote mountainous areas, energy supplies for offshore operations, power devices for nuclear submarines, etc. due to their flexibility advantages. These application scenarios all have the characteristics of flexible load changes, which pose high requirements for the control systems of miniature lead-bismuth fast reactors. The miniature pool-type lead-bismuth fast reactor in China is still in the design verification stage, and system parameters are facing adjustment. Changes in system parameters will affect the response characteristics of the system, and further lead to deterioration of the control system. To design the control system of the miniature pool-type lead-bismuth fast reactor faster and better, a design method for the model library of the miniature pool-type lead-bismuth fast reactor is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a simulation method for a pool-type lead-bismuth fast reactor and related equipment in view of the deficiencies in the above-mentioned prior art, so as to solve the technical problem of poor performance in current simulation of miniature pool-type lead-bismuth fast reactors.

[0005] The object of the present invention is achieved by the following technical solutions: In a first aspect, the present invention provides a simulation method for a pool-type lead-bismuth fast reactor, including: Constructing a simulation module library for a pool-type lead-bismuth fast reactor according to the structure of the pool-type lead-bismuth fast reactor; the simulation module library at least includes a core module, a lead-bismuth pool module, an electromagnetic pump module, a feed water pump module, a valve module, a direct current steam generator module, a steam header module, and a connecting pipeline module; Connecting the modules in the simulation module library of the pool-type lead-bismuth fast reactor in a predetermined order to build a simulation model of the pool-type lead-bismuth fast reactor for realizing the primary coolant circulation and the feed water of the secondary loop; After setting the module parameters in the simulation module library of the lead-bismuth fast reactor accordingly, running the simulation model of the pool-type lead-bismuth fast reactor to complete the construction of the simulation platform for the pool-type lead-bismuth fast reactor.

[0006] As a further improvement of the present invention, a simulation module library of a pool-type lead-bismuth fast reactor is constructed, specifically including: The core module is constructed by using a point reactor dynamics model with 6 groups of delayed neutrons for power calculation and a Mann model to describe the heat transfer process in the core. The lead-bismuth pool module is constructed by: constructing a lead-bismuth pool module including a cold lead-bismuth pool model and a hot lead-bismuth pool model; the volumes of the cold lead-bismuth pool model and the hot lead-bismuth pool model are determined according to the reaction rate of the core module; The electromagnetic pump module is constructed in the following way: constructing an electromagnetic pump model for controlling the flow rate of the core module input interface; The water supply pump module is constructed as follows: the hydraulic model in the water supply pump module satisfies the approximation rule based on the four-quadrant characteristic curve, and the head and torque of the water supply pump are obtained by the pump power; The once-through steam generator module is constructed by adopting the four-heat exchange zone model combined with the movable boundary theory to obtain the model; The steam header module is constructed as follows: the steam header model is a constant volume model, the input of the constant volume model includes the set inlet steam flow rate and corresponding enthalpy value, the outlet steam flow rate and corresponding enthalpy value; the output includes the header pressure and header temperature; The connecting pipe module is constructed as follows: the pipe outlet pressure is calculated based on the input upstream pressure, upstream fluid temperature and downstream flow; the pipe inlet flow is calculated based on the pipe outlet pressure, and then the connecting pipe module is obtained.

[0007] As a further improvement of the present invention, the valve module is constructed as follows: for incompressible fluids, the flow equation is derived from the Bernoulli equation of the actual fluid, and the valve module is constructed according to the flow equation:

[0008] Where: F is the cross-sectional area of the regulating valve / m 2 ; is the form resistance coefficient of the regulating valve, is the sum of the form resistance coefficients at all locations in the pipeline; p 1 is the pressure before the valve / Pa; p 2 is the pressure after the valve / Pa; ρ is the fluid density / kg m -3 .

[0009] As a further improvement of the present invention, the core module also includes a core thermal-hydraulic model and a reactivity feedback model; the core thermal-hydraulic model adopts a single-channel lumped parameter model for transferring coolant; the reactivity feedback model is used to provide reactivity feedback of the core module input.

[0010] As a further improvement of the present invention, the simulation module for realizing the primary coolant circulation includes: Point reactor model, core thermal-hydraulic model, reactivity feedback model, cold lead-bismuth pool model, hot lead-bismuth pool model, electromagnetic pump model; The simulation implementation steps are as follows: The point reactor model, core thermal-hydraulic model, and reactivity feedback model form the core model. After being heated in the core model, lead-bismuth flows from the cold lead-bismuth pool into the core model for heat exchange under the drive of the main pump, and the heated lead-bismuth flows into the hot lead-bismuth pool, then enters the once-through steam generator, and the lead-bismuth cooled by the coolant flows into the cold lead-bismuth pool to complete the cycle.

[0011] As a further improvement of the present invention, the simulation module for realizing the feedwater of the secondary loop includes: The simulation implementation steps are as follows: The secondary loop feedwater system provides the pressure and temperature before the feed pump, and the steam header module provides the pressure after the main steam valve; The feedwater of the secondary loop feedwater system is pressurized by the feed pump and flows into the pipe after the pump in the connection pipe module for confluence, and is divided through the pipe after the pump; After being divided, the feedwater enters two loops, flows through the pipeline before the valve to the feedwater valve for feedwater flow regulation, the feedwater after passing through the feedwater valve flows into the pipeline after the valve and is divided by the pipeline after the valve, each pipeline after the valve is connected with 4 pipelines before the OTSG, and a module valve is arranged on each pipeline before the OTSG; It flows into the once-through steam generator module through the pipeline before the OTSG for heat exchange, and the generated superheated steam is merged by the pipeline after the OTSG and finally flows into the steam header module; The steam header module sends the steam to the steam turbine to do work through the main steam valve; The outlet of the hot lead-bismuth pool in the primary coolant circulation is connected to the inlet of the primary side of the once-through steam generator, and the outlet of the primary side of the once-through steam generator is connected to the inlet of the cold lead-bismuth pool to complete the loop closure.

[0012] As a further improvement of the present invention, the module parameters in the lead-bismuth fast reactor simulation module library are set correspondingly, specifically including: A parameter input module is set, which is communicatively connected to the modules in the simulation module library, and the parameter input module is used to modify the corresponding module parameters.

[0013] In a second aspect, the present invention provides a pool-type lead-bismuth fast reactor simulation system for realizing the above-mentioned pool-type lead-bismuth fast reactor simulation method, including: A simulation module library construction unit constructs a pool-type lead-bismuth fast reactor simulation module library according to the structure of the pool-type lead-bismuth fast reactor; the simulation module library at least includes a core module, a lead-bismuth pool module, an electromagnetic pump module, a feed pump module, a valve module, a once-through steam generator module, a steam header module, and a pipeline module; The pool - type lead - bismuth fast reactor simulation model construction module connects the modules in the pool - type lead - bismuth fast reactor simulation module library in a predetermined order to build a pool - type lead - bismuth fast reactor simulation model for realizing the primary coolant circulation and the feed - water of the secondary loop; The parameter setting module is used to set the parameters of the modules in the lead - bismuth fast reactor simulation module library respectively, and then run the pool - type lead - bismuth fast reactor simulation model to complete the construction of the pool - type lead - bismuth fast reactor simulation platform.

[0014] In a third aspect, the present invention provides a computer - readable storage medium storing one or more programs, where the one or more programs include instructions that, when executed by a computing device, cause the computing device to execute the above - mentioned pool - type lead - bismuth fast reactor simulation method.

[0015] In a fourth aspect, the present invention provides a computing device, including: One or more processors, a memory, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include steps for executing the above - mentioned pool - type lead - bismuth fast reactor simulation method.

[0016] The beneficial effects of the present invention are as follows: The pool - type lead - bismuth fast reactor simulation method provided by the present invention can simulate various operating conditions and accident scenarios through the simulation model to evaluate the safety performance of the reactor. By constructing a pool - type lead - bismuth fast reactor simulation platform, accurate simulation of the reactor operation process can be achieved through modular design and parameter setting. This platform not only helps to improve the safety of the reactor and design optimization. The simulation model of the present invention can be used to optimize the design parameters of the reactor, such as the flow rate of the coolant, the structure of the reactor core, etc., to improve the performance and efficiency of the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the Mann model and node division proposed in the embodiment of the present invention; Figure 2 It is a schematic diagram of the Simulink model of the once - through steam generator proposed in the embodiment of the present invention; Figure 3 It is a schematic diagram of the primary coolant circulation system model library proposed in the embodiment of the present invention; Figure 4It is the curve diagram of the influence of the cold lead-bismuth pool volume on the system characteristics proposed in the embodiment of the present invention; Figure 5 It is the curve diagram of the influence of the hot lead-bismuth pool volume on the system characteristics proposed in the embodiment of the present invention; Figure 6 It is the curve diagram of the influence of the steam header volume on the system characteristics proposed in the embodiment of the present invention; Figure 7 It is the schematic diagram of the parameter input module proposed in the embodiment of the present invention; Figure 8 It is the logic diagram of the small lead-bismuth fast reactor proposed in the embodiment of the present invention; Figure 9 It is the schematic diagram of the small lead-bismuth fast reactor simulation platform proposed in the embodiment of the present invention; Figure 10 It is the schematic diagram of the simulation process of the small pool-type lead-bismuth fast reactor model proposed in the embodiment of the present invention; Figure 11(a) is in the embodiment of the present invention Figure 10 The schematic diagram of the data setting interface in the model library during the proposed simulation process; Figure 11(b) is in the embodiment of the present invention Figure 10 The schematic diagram of the data setting of the interactive interface 1 proposed; Figure 11(c) is in the embodiment of the present invention Figure 10 The schematic diagram of the data setting of the interactive interface 2 proposed; Figure 12 It is in the feed pump module of the embodiment of the present invention h / α 2 The curve schematic diagram; Figure 13 It is the curve schematic diagram in the feed pump module proposed in the embodiment of the present invention β / α 2 The curve schematic diagram; Figure 14 It is the Cv curve schematic diagram of the valve in the valve module proposed in the embodiment of the present invention. Specific embodiments

[0019] In order to make the purpose and technical solutions of the present invention clearer and easier to understand. The following further details the present invention in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Among them, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Embodiment 1 Such as Figures 1 to 14As shown, this embodiment provides a simulation method for a pool-type lead-bismuth fast reactor. Compared with the traditional modeling method, the method in this embodiment adopts parametric and modular modeling. For small pool-type lead-bismuth fast reactors with different structures, corresponding modules can be copied from the model library to adjust the model. When parameters need to be modified, only fill in the parameters according to the corresponding text in the input table to complete the parameter modification of the model. The specific implementation of this method is as follows.

[0022] First, construct a simulation module library for the pool-type lead-bismuth fast reactor according to its structure. Among them, the simulation module library includes at least a core module, a lead-bismuth pool module, an electromagnetic pump module, a feed water pump module, a valve module, a once-through steam generator module, a steam header module, and a connecting pipe module. When a data (feed water temperature and feed water pressure at the inlet of the feed water pump) is input into the simulation platform, how to make each module operate to obtain the output data.

[0023] Specifically, in order to accurately simulate a small pool-type lead-bismuth fast reactor in this embodiment, a simulation model library including a core, a cold lead-bismuth pool, a hot lead-bismuth pool, an electromagnetic pump, a control rod, a feed water pump, a once-through steam generator, a loop valve, a module valve, a steam header, and a connecting pipe is established according to the characteristics of the small pool-type lead-bismuth fast reactor. The MASK function is used for modular packaging. To achieve user data interaction, all parameters are named with standardized parameters for data transfer between the user interface and the small pool-type lead-bismuth fast reactor simulation platform.

[0024] Among them, the cold lead-bismuth pool and the hot lead-bismuth pool are modularly packaged into a lead-bismuth pool module. The loop valve and the module valve are packaged into a valve module.

[0025] The construction method of each module is as follows: The construction method of the core module is: it is constructed by using a point kinetic model with 6 groups of delayed neutrons. The input of this model is the total reactivity, and the outputs are the neutron density and the nuclear reactor power. Among them, the core module performs two kinds of calculations. One is power calculation, that is, through the point kinetic model with 6 groups of delayed neutrons, the changes of neutron density and nuclear reactor power are described. The other is heat transfer calculation, and the Mann model is used to describe the heat transfer process in the core. This model uses one fuel node corresponding to two coolant nodes. As shown in Figure 1, it has higher accuracy compared with the traditional single-node method.

[0026] The construction method of the lead-bismuth pool module is: construct a lead-bismuth pool module including a cold lead-bismuth pool model and a hot lead-bismuth pool model; the volumes of the cold lead-bismuth pool model and the hot lead-bismuth pool model are determined according to the reaction rate of the core module; The construction method of the electromagnetic pump module is: construct an electromagnetic pump model for controlling the flow rate at the input interface of the core module; The construction method of the feed water pump module is as follows: The hydraulic model of the feed water pump satisfies the approximation law, which is called the four-quadrant characteristic curve. To obtain the head and torque of the feed water pump from the pump power, two two-dimensional tables are required to query the calculation characteristics of the pump. Therefore, in this embodiment, the head ratio h 、torque ratio β 、pump speed ratio α and capacity flow ratio υ are set. The analogy curve is drawn in the form of h / α 2 and β / α 2 as shown in Figure 12 、 Figure 13 . They are all functions of υ / α . The curve can be obtained by fitting using the least squares method.

[0027] The construction method of the valve module is as follows: For incompressible fluids, the flow equation can be derived from the Bernoulli equation of real fluids:

[0028] In the formula: F is the cross-sectional area of the regulating valve connection / m 2 ; is the form resistance coefficient of the regulating valve, is the sum of the form resistance coefficients at various parts of the pipeline. Usually is determined by experiments; p 1 is the pressure before the valve / Pa; p 2 is the pressure after the valve / Pa; ρ is the fluid density / kg m -3 . The relationship between the valve opening and the feed water flow can be obtained using the valve curve as shown in Figure 14 .

[0029] The construction method of the once-through steam generator module is as follows: It is modeled by using the four heat exchange zone model combined with the movable boundary theory; The construction method of the steam header module is as follows: The steam header model can be regarded as a constant volume model with inflow and outflow. The inputs of the steam header are the inlet steam flow rate and enthalpy value, and the outlet steam flow rate and enthalpy value. The outputs of the steam header are the header pressure and header temperature (steam enthalpy value). Heat dissipation from the header to the outside is not considered during modeling.

[0030] ​The connection pipeline module is constructed as follows: Assume that the fluid flow in the pipeline is adiabatic flow, that is, the heat exchange between the fluid inside the pipeline and the external environment of the pipeline is not considered. Due to the viscous effect of the fluid, the pressure of the fluid continuously decreases along the flow direction. The flow inside the pipeline can be divided into horizontal pipelines, vertical pipelines, inclined pipelines, etc. according to the pipeline layout.

[0031] Secondly, connect the modules in the pool-type lead-bismuth fast reactor simulation module library in a predetermined order to build a pool-type lead-bismuth fast reactor simulation model for realizing the primary coolant circulation and the feed water of the secondary loop.

[0032] The model for realizing the primary coolant circulation includes a point reactor model, a thermal-hydraulic model, a reactivity feedback model, a cold lead-bismuth pool model, a hot lead-bismuth pool model, and an electromagnetic pump model; the core model is composed of the point reactor model, the core thermal-hydraulic model, and the reactivity feedback model. After being heated in the core model, the lead-bismuth flows into the core model from the cold lead-bismuth pool under the push of the main pump for heat exchange, and the heated lead-bismuth flows into the hot lead-bismuth pool, and then enters the once-through steam generator. The lead-bismuth cooled by the coolant flows into the cold lead-bismuth pool to complete the cycle.

[0033] Specifically, the simulation steps are as follows: The nuclear reactor power calculated by the point reactor model is used as an input to affect the heat transfer calculation in the thermal-hydraulic model. The temperature change calculated by the thermal-hydraulic model will affect the reactivity change in the reactivity feedback model. The reactivity change calculated by the reactivity feedback model is used as an input and fed back to the point reactor model to affect the neutron density and the nuclear reactor power. The reactivity change calculated by the reactivity feedback model is used as an input and fed back to the point reactor model to affect the neutron density and the nuclear reactor power.

[0034] The temperature and state of the cold lead-bismuth pool and the hot lead-bismuth pool affect the operating parameters of the electromagnetic pump. The coolant temperature and flow rate calculated by the thermal-hydraulic model are used as inputs to affect the heat transfer and steam generation of the once-through steam generator.

[0035] The model for realizing the feed water of the secondary loop includes a feed water pump model, a feed water valve model, a once-through steam generator model, a module valve model, a steam header model, and a connection pipeline model.

[0036] From a data flow perspective, the models are connected as follows: the point reactor model outputs neutron density and nuclear reactor power as inputs to the thermal-hydraulic model. The thermal-hydraulic model outputs coolant temperature and flow rate as inputs to the cold lead-bismuth pool model and the hot lead-bismuth pool model. The cold lead-bismuth pool model and the hot lead-bell pool model output lead-bismuth temperature and state as inputs to the electromagnetic pump model. The electromagnetic pump model outputs coolant flow rate and pressure as inputs to the thermal-hydraulic model. The thermal-hydraulic model outputs coolant temperature and flow rate as inputs to the once-through steam generator model. The once-through steam generator model outputs steam flow rate and pressure as inputs to the feedwater pump model and the feedwater valve model. The feedwater pump model and the feedwater valve model output feedwater flow rate and pressure as inputs to the once-through steam generator model.

[0037] The simulation steps for the simulation module used to realize the secondary water supply are as follows: the secondary water supply system provides the water pump inlet pressure and temperature, and the steam header module provides the main steam valve outlet pressure; The water supply of the secondary circuit water supply system is pressurized by the water supply pump and flows into the pipeline after the pump in the connecting pipeline module for merging and then being diverted through the pipeline after the pump; After diversion, the feedwater enters two loops and flows through the pre-valve pipeline to the feedwater valve for flow regulation. After the feedwater valve, the feedwater flows into the post-valve pipeline and is diverted by the post-valve pipeline. Each post-valve pipeline is connected to four OTSG (Once-Through Steam Generator) pre-pipes, and each OTSG pre-pipe is equipped with a modular valve. The steam flows into the once-through steam generator module through the OTSG front pipeline for heat exchange, and the generated superheated steam is collected by the OTSG rear pipeline and finally flows into the steam header module; The steam header module sends steam to the steam turbine to perform work through the main steam valve; In the main coolant circulation, the hot lead-bismuth pool outlet is connected to the primary side inlet of the direct current steam generator, and the primary side outlet of the direct current steam generator is connected to the cold lead-bismuth pool inlet to complete the loop closure.

[0038] Finally, after setting the module parameters in the lead-bismuth fast reactor simulation module library, the pool-type lead-bismuth fast reactor simulation model is run to complete the construction of the pool-type lead-bismuth fast reactor simulation platform. Figure 9 、 Figure 10 As shown, Figure 10 The detailed information is shown in Figures 11(a) to 11(c). Users can copy the corresponding modules in the model library to adjust the model according to the different structures of small pool-type lead-bismuth fast reactors. Interaction interface 1 in Figure 11(b) is used for data transmission between the user interface of the small pool-type lead-bismuth fast reactor simulation software and the small pool-type lead-bismuth fast reactor simulation platform; interaction interface 2 in Figure 11(c) is used for data transmission within the small pool-type lead-bismuth fast reactor simulation platform.

[0039] Example 2 As a further improvement to the once-through steam generator model, this embodiment specifically includes: The once-through steam generator model is modeled by using a four-heat-exchange-zone model combined with the movable boundary theory. The established Simulink model of the once-through steam generator is as Figure 2 shown, where there are 9 primary-side temperature calculation nodes, 9 primary-side to tube-wall heat transfer nodes, 9 tube-wall temperature calculation nodes, 9 tube-wall to secondary-side heat transfer nodes, 9 secondary-side temperature calculation nodes, 9 secondary-side flow rate calculation nodes. Additionally, there is 1 data output node, 1 lead-bismuth physical property calculation node, 1 parameter visualization node, 1 dryout point calculation node, 1 secondary-side single-phase region pressure drop calculation node, 1 secondary-side heat transfer coefficient calculation node, 1 secondary-side two-phase region pressure drop calculation node, and 1 primary-side heat transfer coefficient calculation node, totaling 62 nodes.

[0040] Example 3 As another preferred embodiment of this example, this solution specifically includes the following steps: S1. Use MATLAB / Simulink software to model the key models of the small lead-bismuth fast reactor; S2. Use the MASK function for encapsulation. After encapsulation, use the parameterization method to name the key parameters of the model and form a model library; S3. Select the corresponding modules from the model library according to the small lead-bismuth fast reactor system and connect them in logical order to build a small lead-bismuth fast reactor simulation platform.

[0041] Among them, the volumes of the cold lead-bismuth pool, the hot lead-bismuth pool, and the steam header have a greater impact on the characteristics of the small pool-type lead-bismuth fast reactor. When designing the small pool-type lead-bismuth fast reactor, it is necessary to continuously adjust the system parameters to ensure that the system has good operating characteristics.

[0042] As Figure 4 shown, as the volume of the cold lead-bismuth pool increases, the response of the system gradually slows down, and as the cold pool increases, the influence of the cold pool on the system also gradually increases. This indicates that when there are other inertial links in the system, even if the cold pool is small enough, it cannot effectively improve the dynamic characteristics of the system. And when the cold lead-bismuth pool gradually increases, the delay of the system is mainly determined by the cold lead-bismuth pool. Therefore, the size of the cold lead-bismuth pool needs to be determined according to other links.

[0043] As Figure 5As shown, similar to the impact of the cold lead-bismuth pool on the system, as the volume of the hot lead-bismuth pool increases, the response of the system gradually slows down, and as the cold pool increases, the impact of the cold pool on the system also gradually increases. This indicates that when there are other inertial links in the system, even if the hot pool is small enough, the dynamic characteristics of the system cannot be effectively improved. When the hot lead-bismuth pool gradually increases, the delay of the system is mainly determined by the hot lead-bismuth pool. Therefore, the size of the hot lead-bismuth pool needs to be determined according to other links.

[0044] As Figure 6 shown, as the volume of the steam header increases, the response of the system gradually slows down, but at the same time, the change range of the power decreases. That is, a large enough volume of the steam header can effectively prevent the sudden load fluctuation from making the system power change relatively stable. Therefore, the steam header should not be too small. When the volume of the steam header significantly affects the dynamic characteristics of the system, the impact of the volume of the lead-bismuth pool on the system will also become less obvious. Therefore, the volume design of the steam main pipe / header needs to consider the system stability and sensitivity. When the volume of the header is large enough, it can also be coordinated with the size of the lead-bismuth pool to optimize the system characteristics.

[0045] Example 4 This example provides a pool-type lead-bismuth fast reactor simulation system, which is used to implement the pool-type lead-bismuth fast reactor simulation method in Example 1. The system mainly includes: A simulation module library construction unit constructs a pool-type lead-bismuth fast reactor simulation module library according to the structure of the pool-type lead-bismuth fast reactor; the simulation module library at least includes a core module, a lead-bismuth pool module, an electromagnetic pump module, a feed water pump module, a valve module, a once-through steam generator module, a steam header module, and a pipeline module; A pool-type lead-bismuth fast reactor simulation model construction module connects the modules in the pool-type lead-bismuth fast reactor simulation module library in a predetermined order to build a pool-type lead-bismuth fast reactor simulation model for realizing the main coolant circulation and the feed water of the secondary circuit; A parameter setting module is used to respectively set the module parameters in the lead-bismuth fast reactor simulation module library, and then run the pool-type lead-bismuth fast reactor simulation model to complete the construction of the pool-type lead-bismuth fast reactor simulation platform.

[0046] Example 5 In another embodiment of the present invention, a computer-readable storage medium is provided. As a storage component within a terminal device, its function is to store programs and data. It should be noted that the computer-readable storage medium here not only covers the built-in storage components of the terminal device, but also includes the expandable storage components supported by the device. Its essence is a tangible medium that can contain or store programs, and these programs can be called by an instruction execution system, device, or component, or operate in cooperation with them. This storage medium provides a storage area for the operating system of the terminal, and at the same time stores one or more instructions suitable for the processor to load and run, and these instructions can constitute one or more computer programs containing program code.

[0047] Specifically, examples (non-exclusive list) of computer-readable storage media include: electrical connections with one or more wires, portable disks, hard disks, random access memories, read-only memories, erasable programmable read-only memories, optical fibers, portable compact disc read-only memories, optical storage devices, magnetic storage devices, or any reasonable combination of the above types.

[0048] The storage medium may also include data signals propagated as part of a baseband portion or a carrier wave, which carry readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any reasonable combination of the two. In addition, the computer-readable storage medium may also refer to other readable media other than traditional readable storage media, and such media can send, propagate, or transmit programs for use or operation in cooperation with an instruction execution system, device, or component. The program code on the storage medium can be transmitted through any suitable medium, including but not limited to wireless, wired, optical cable, etc. transmission methods, or any reasonable combination of them.

[0049] The program code for implementing the operations of the present invention can be written in any combination of one or more programming languages, including both object-oriented programming languages such as Java and C++, and conventional procedural programming languages such as the "C" language. The execution modes of the program code include: running entirely on the user's computing device, running partially on the user's device and being an independent software package, running partially in a distributed manner on the user's device and a remote computing device, or running entirely on a remote computing device or server. When it comes to a remote computing device, the device can be connected to the user's computing device through any type of network such as a local area network or a wide area network, or connected to an external computing device through an Internet service provider via the Internet.

[0050] The processor can load and run one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the pool-type lead-bismuth fast reactor simulation method described in Embodiment 1.

Claims

1. A simulation method for a pool-type lead-bismuth fast reactor, characterized in that, Including: Construct a pool-type lead-bismuth fast reactor simulation module library according to the structure of the pool-type lead-bismuth fast reactor; the simulation module library at least includes a core module, a lead-bismuth pool module, an electromagnetic pump module, a feed water pump module, a valve module, a once-through steam generator module, a steam header module, and a connecting pipe module; Connect the modules in the pool-type lead-bismuth fast reactor simulation module library in a predetermined order to build a pool-type lead-bismuth fast reactor simulation model for realizing the main coolant circulation and the feed water of the secondary circuit; After setting the module parameters in the lead-bismuth fast reactor simulation module library respectively, run the pool-type lead-bismuth fast reactor simulation model to complete the construction of the pool-type lead-bismuth fast reactor simulation platform.

2. The pool-type lead-bismuth fast reactor simulation method according to claim 1, wherein Construct a pool-type lead-bismuth fast reactor simulation module library, specifically including: The construction method of the core module is: use the point kinetic model of 6 groups of delayed neutrons for power calculation, and use the Mann model to describe the heat transfer process in the core; The construction method of the lead-bismuth pool module is: construct a lead-bismuth pool module including a cold lead-bismuth pool model and a hot lead-bismuth pool model; the volumes of the cold lead-bismuth pool model and the hot lead-bismuth pool model are determined according to the reaction rate of the core module; The construction method of the electromagnetic pump module is: construct an electromagnetic pump model for controlling the flow rate of the input interface of the core module; The construction method of the feed water pump module is: the hydraulic model in the feed water pump module satisfies the approximate rule based on the four-quadrant characteristic curve, and the head and torque of the feed water pump are obtained through the power of the pump; The construction method of the once-through steam generator module is: model it by using the four heat transfer zone model combined with the movable boundary theory; The construction method of the steam header module is: the steam header model is used as a constant volume model, and the inputs of the constant volume model include the set inlet steam flow rate and the corresponding enthalpy value, the outlet steam flow rate and the corresponding enthalpy value; the outputs include the header pressure and the header temperature; The construction method of the connecting pipe module is: calculate the outlet pressure of the pipe according to the input upstream pressure, upstream fluid temperature and downstream flow rate; calculate the inlet flow rate of the pipe according to the outlet pressure of the pipe, and then obtain the connecting pipe module.

3. The pool-type lead-bismuth fast reactor simulation method according to claim 1, characterized in that The construction method of the valve module is: for incompressible fluids, derive the flow equation from the Bernoulli equation of real fluids, and construct the valve module according to the flow equation: In the formula: F is the cross-sectional area of the regulating valve connection pipe / m 2 ; is the form resistance coefficient of the regulating valve, is the sum of the form resistance coefficients at each part of the pipeline; p 1 is the pressure in front of the valve / Pa; p 2 is the pressure behind the valve / Pa; ρ is the fluid density / kg m -3 。 4. The pool-type lead-bismuth fast reactor simulation method according to claim 3, wherein, The core module also includes a core thermal-hydraulic model and a reactivity feedback model; the core thermal-hydraulic model uses a single-channel lumped parameter model for transferring coolant; the reactivity feedback model is used to provide the reactivity feedback input to the core module.

5. The pool-type lead-bismuth fast reactor simulation method according to claim 3, characterized in that The simulation modules for realizing the main coolant circulation include: Point kinetic model, core thermal-hydraulic model, reactivity feedback model, cold lead-bismuth pool model, hot lead-bismuth pool model, electromagnetic pump model; The simulation implementation steps are: a core model is composed of a point kinetic model, a core thermal-hydraulic model, and a reactivity feedback model. After being heated in the core model, lead-bismuth flows into the core model from the cold lead-bismuth pool under the push of the main pump for heat exchange, and the heated lead-bismuth flows into the hot lead-bismuth pool, and then enters the once-through steam generator. The lead-bismuth cooled by the coolant flows into the cold lead-bismuth pool to complete the cycle.

6. The pool-type lead-bismuth fast reactor simulation method according to claim 3, characterized in that The simulation modules for realizing the feed water of the secondary circuit include: The simulation implementation steps are as follows: The secondary loop feedwater system provides the pressure and temperature before the feed pump, and the steam header module provides the pressure after the main steam valve; The feedwater of the secondary loop feedwater system is pressurized by the feed pump and then flows into the pipeline after the pump in the connection pipeline module for confluence, and is divided through the pipeline after the pump; After the division, the feedwater enters two loops, flows through the pipeline before the valve to the feedwater valve for feedwater flow regulation, the feedwater after the feedwater valve flows into the pipeline after the valve and is divided by the pipeline after the valve, each pipeline after the valve is connected with 4 pipelines before the OTSG, and a module valve is arranged on each pipeline before the OTSG; It flows into the once-through steam generator module through the pipeline before the OTSG for heat exchange, and the generated superheated steam is converged by the pipeline after the OTSG and finally flows into the steam header module; The steam header module sends the steam to the steam turbine to do work through the main steam valve; In the main coolant cycle, the outlet of the hot lead-bismuth pool is connected to the inlet of the primary side of the once-through steam generator, and the outlet of the primary side of the once-through steam generator is connected to the inlet of the cold lead-bismuth pool to complete the loop closure.

7. The pool-type lead-bismuth fast reactor simulation method according to claim 1, characterized in that Corresponding settings are respectively made for the module parameters in the lead-bismuth fast reactor simulation module library, specifically including: A parameter input module is set up, which is communicatively connected to the modules in the simulation module library, and the parameter input module is used to modify the corresponding module parameters.

8. A pool-type lead-bismuth fast reactor simulation system for implementing the pool-type lead-bismuth fast reactor simulation method according to any one of claims 1 to 7, characterized in that, Including: A simulation module library construction unit constructs a pool-type lead-bismuth fast reactor simulation module library according to the structure of the pool-type lead-bismuth fast reactor; the simulation module library at least includes a core module, a lead-bismuth pool module, an electromagnetic pump module, a feed pump module, a valve module, a once-through steam generator module, a steam header module and a pipeline module; A pool-type lead-bismuth fast reactor simulation model construction module connects the modules in the pool-type lead-bismuth fast reactor simulation module library in a predetermined order to build a pool-type lead-bismuth fast reactor simulation model for realizing the main coolant cycle and the secondary loop feedwater; A parameter setting module is used to respectively make corresponding settings for the module parameters in the lead-bismuth fast reactor simulation module library, and then run the pool-type lead-bismuth fast reactor simulation model to complete the construction of the pool-type lead-bismuth fast reactor simulation platform.

9. A computer-readable storage medium storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to execute the pool-type lead-bismuth fast reactor simulation method according to any one of claims 1 to 7.

10. A computing device, characterized in that, Including: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include steps for executing the pool-type lead-bismuth fast reactor simulation method according to any one of claims 1 to 7.

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