Method for determining deviation of design limit value of nucleate boiling ratio of hybrid reactor core and product

Abstract

The invention provides a method for determining a deviation nucleation boiling ratio design limit value of a hybrid reactor core and a product. The determination method comprises the following steps: acquiring a first deviation nucleation boiling ratio design limit value of a whole reactor core of the hybrid reactor core; determining a target fuel assembly in the at least two fuel assemblies of the hybrid reactor core, wherein the deviation nucleation boiling ratio of the target fuel assembly represents the minimum deviation nucleation boiling ratio of the hybrid reactor core; according to the relation between the deviation nucleation boiling ratio of the target fuel assembly and the first deviation nucleation boiling ratio design limit value, the deviation nucleation boiling ratio design limit value of the hybrid reactor core is determined. According to the method, the target fuel assembly with the deviation nucleation boiling ratio representing the minimum deviation nucleation boiling ratio of the hybrid reactor core is determined, and the deviation nucleation boiling ratio design limit value of the hybrid reactor core is determined based on the relationship between the deviation nucleation boiling ratio of the target fuel assembly and the first deviation nucleation boiling ratio design limit value; the efficiency and accuracy of determining the deviation nucleation boiling ratio design limit value of the hybrid reactor core can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear reactors, and in particular to a method and product for determining a hybrid core deviation from a design limit of a nucleate boiling ratio. Background Art

[0002] The design limit of departure from nucleate boiling ratio (DNBR) is the basis of nuclear reactor safety assessment. During the operation of a nuclear reactor, it is necessary to monitor the minimum DNBR value of the core in real time and determine whether the minimum DNBR value is greater than the design limit of DNBR to prevent departure from nucleate boiling (DNB) in the core under accident conditions.

[0003] The current method for determining DNBR design limits mainly focuses on determining the DNBR design limits of the full core composed of the same fuel assembly. There is currently no efficient method for determining the DNBR design limits for mixed cores composed of different fuel assemblies.

[0004] How to improve the efficiency and accuracy of determining the hybrid core deviation from the nucleate boiling ratio design limit has become an urgent problem to be solved. Summary of the invention

[0005] The main purpose of the embodiments of the present application is to propose a method and product for determining the design limit of the deviation of the hybrid core from the nucleate boiling ratio, aiming to improve the efficiency and accuracy of determining the design limit of the deviation of the hybrid core from the nucleate boiling ratio.

[0006] The present application provides a method for determining a design limit of a deviation from nucleate boiling ratio of a hybrid core, wherein the hybrid core comprises at least two fuel assemblies, and the entire core of the hybrid core is composed of a first fuel assembly among the at least two fuel assemblies, and the determination method comprises: obtaining a first design limit of a deviation from nucleate boiling ratio of the entire core; determining a target fuel assembly among the at least two fuel assemblies, the deviation from nucleate boiling ratio of the target fuel assembly representing the minimum deviation from nucleate boiling ratio of the hybrid core; and determining the design limit of the deviation from nucleate boiling ratio of the hybrid core according to a relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first design limit of the deviation from nucleate boiling ratio.

[0007] In one embodiment, the deviation from nucleate boiling ratio of the target fuel assembly includes deviation from nucleate boiling ratios corresponding to multiple first critical heat flux test points of the target fuel assembly; the step of determining the deviation from nucleate boiling ratio design limit of the hybrid core based on the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit includes: determining the proportion of second critical heat flux test points based on the relationship between the deviation from nucleate boiling ratios corresponding to the multiple first critical heat flux test points and the first deviation from nucleate boiling ratio design limit; the second critical heat flux test point is a test point among the multiple first critical heat flux test points whose deviation from nucleate boiling ratio is greater than the first deviation from nucleate boiling ratio design limit; comparing the proportion of the second critical heat flux test point with a preset proportion; if the proportion of the second critical heat flux test point is higher than or equal to the preset proportion, determining the first deviation from nucleate boiling ratio design limit as the deviation from nucleate boiling ratio design limit of the hybrid core.

[0008] In one embodiment, after the step of comparing the proportion of the second critical heat flux test points with the preset proportion, the determination method further includes: if the proportion of the second critical heat flux test points is lower than the preset proportion, updating the first deviation from nucleate boiling ratio design limit to the second deviation from nucleate boiling ratio design limit, and returning to execute the step of determining the proportion of the second critical heat flux test points according to the relationship between the deviations from nucleate boiling ratios corresponding to the multiple first critical heat flux test points and the first deviation from nucleate boiling ratio design limit, until the proportion of the second critical heat flux test points is higher than or equal to the preset proportion, and determining the first deviation from nucleate boiling ratio design limit at this time as the deviation from nucleate boiling ratio design limit of the hybrid core; wherein the second deviation from nucleate boiling ratio design limit is lower than the first deviation from nucleate boiling ratio design limit.

[0009] In one embodiment, before determining the proportion of second critical heat flux test points according to the relationship between the deviation from nucleate boiling ratio corresponding to the multiple first critical heat flux test points and the first deviation from nucleate boiling ratio design limit, the determination method also includes: obtaining critical heat flux test values ​​corresponding to the multiple first critical heat flux test points; determining critical heat flux prediction values ​​corresponding to the multiple third critical heat flux test points according to the thermal parameters of the multiple third critical heat flux test points of the target fuel assembly and the thermal diffusion coefficient of the target fuel assembly, combined with the critical heat flux relationship of the first fuel assembly; for each first critical heat flux test point, determining the ratio of the critical heat flux test value corresponding to the first critical heat flux test point to the critical heat flux prediction value corresponding to the fourth critical heat flux test point as the deviation from nucleate boiling ratio corresponding to the first critical heat flux test point; wherein the fourth critical heat flux test point is a test point among the multiple third critical heat flux test points that corresponds to the first critical heat flux test point; and the thermal parameters of the multiple third critical heat flux test points are calculated based on the sub-channel thermal safety analysis model of the hybrid core.

[0010] In one embodiment, before determining the ratio of the critical heat flux test value corresponding to the first critical heat flux test point to the critical heat flux predicted value corresponding to the fourth critical heat flux test point as the deviation from nucleate boiling ratio corresponding to the first critical heat flux test point, the determination method further includes: determining, for each of the first critical heat flux test points, the deviation between the first critical heat flux test point and the plurality of third critical heat flux test points; and determining the third critical heat flux test point corresponding to the deviation within a preset range as the fourth critical heat flux test point.

[0011] In one embodiment, the determining of the target fuel assembly among the at least two fuel assemblies includes: determining the fuel assembly with the largest thermal diffusion coefficient among the at least two fuel assemblies as the target fuel assembly.

[0012] The present application also provides a system for determining the design limit of the deviation of the nucleate boiling ratio of a hybrid core, wherein the hybrid core comprises at least two fuel assemblies, and the full core of the hybrid core is composed of the first fuel assembly of the at least two fuel assemblies, and the determination system comprises an acquisition module, a fuel assembly determination module and a design limit determination module; the acquisition module is used to acquire the first deviation from the nucleate boiling ratio design limit of the full core; the fuel assembly determination module is used to determine a target fuel assembly among the at least two fuel assemblies, the deviation from the nucleate boiling ratio of the target fuel assembly characterizing the minimum deviation from the nucleate boiling ratio of the hybrid core; the design limit determination module is used to determine the deviation from the nucleate boiling ratio design limit of the hybrid core according to the relationship between the deviation from the nucleate boiling ratio of the target fuel assembly and the first deviation from the nucleate boiling ratio design limit.

[0013] The present application also provides an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio is implemented.

[0014] The present application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio.

[0015] The present application also provides a computer program product, which is stored in a storage medium. When the computer program product is executed by at least one processor, it implements the above-mentioned method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio.

[0016] The present application provides a method and product for determining the design limit of the deviation from nucleate boiling ratio of a hybrid core. The method improves the efficiency and accuracy of determining the design limit of the deviation from nucleate boiling ratio of the hybrid core by determining a target fuel assembly whose deviation from nucleate boiling ratio characterizes the minimum deviation from nucleate boiling ratio of the hybrid core, and determining the design limit of the deviation from nucleate boiling ratio of the hybrid core based on the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of an embodiment of a method for determining a hybrid core deviation from a nucleate boiling ratio design limit value provided by the present application;

[0018] Figure 2 It is a specific flow chart of an embodiment of a method for determining a hybrid core deviation from a nucleate boiling ratio design limit value provided by the present application;

[0019] Figure 3It is a schematic diagram of the structure of a system for determining a hybrid core deviation from a design limit of nucleate boiling ratio provided in the present application;

[0020] Figure 4 is a schematic structural diagram of an embodiment of an electronic device provided by the present application;

[0021] Figure 5 It is a structural schematic diagram of another embodiment of the electronic device provided by the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0023] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0024] The method for determining the hybrid core deviation from the design limit of the nucleate boiling ratio provided in the embodiment of the present application can be applied to the terminal, can also be applied to the server side, and can also be software running in the terminal or the server side. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server side can be configured as an independent physical server, or a server cluster or a distributed system composed of multiple physical servers, and can also be configured as a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application that implements the method for determining the hybrid core deviation from the design limit of the nucleate boiling ratio, etc., but is not limited to the above forms.

[0025] The method for determining the design limit of the deviation of the nucleate boiling ratio of the hybrid core provided in the embodiment of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0026] See also Figure 1The embodiment of the present application provides a method for determining a hybrid core deviation from a design limit of a nucleate boiling ratio, wherein the hybrid core includes at least two fuel assemblies, and the entire core of the hybrid core is composed of a first fuel assembly of the at least two fuel assemblies, and the determination method includes:

[0027] Step S101: obtaining a first deviation from nucleate boiling ratio design limit value of the entire core;

[0028] Step S102: determining a target fuel assembly among at least two fuel assemblies, wherein the deviation from nucleate boiling ratio of the target fuel assembly represents a minimum deviation from nucleate boiling ratio of the hybrid core;

[0029] Step S103: Determine the deviation from nucleate boiling ratio design limit of the hybrid core according to the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit.

[0030] An embodiment of the present application provides a method and product for determining the design limit of the deviation from nucleate boiling ratio of a hybrid core. The method improves the efficiency and accuracy of determining the design limit of the deviation from nucleate boiling ratio of the hybrid core by determining a target fuel assembly whose deviation from nucleate boiling ratio characterizes the minimum deviation from nucleate boiling ratio of the hybrid core, and determining the design limit of the deviation from nucleate boiling ratio of the hybrid core based on the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit.

[0031] Optionally, the first deviation from nucleate boiling ratio design limit in the above step S101 is determined based on a deterministic method or a statistical method. The deterministic method is to use the maximum value of the deviation from nucleate boiling ratios corresponding to all critical heat flux test points in the whole core as the deviation from nucleate boiling ratio design limit of the whole core; the statistical method is to determine the deviation from nucleate boiling ratios under different parameters such as power and flow rate by sampling under normal operating conditions and accident conditions of the whole core, and use the maximum value of the determined deviation from nucleate boiling ratios as the deviation from nucleate boiling ratio design limit of the whole core.

[0032] In one embodiment, determining a target fuel assembly among at least two fuel assemblies in step S102 includes:

[0033] The fuel assembly with the largest thermal diffusion coefficient among the at least two fuel assemblies is determined as the target fuel assembly.

[0034] Optionally, when the deviation between the critical heat flux test points of the at least two fuel assemblies is within the target range, the fuel assembly with the largest thermal diffusion coefficient among the at least two fuel assemblies is selected as the target fuel assembly. The deviation between the critical heat flux test points of the at least two fuel assemblies within the target range indicates that the critical heat flux test values ​​of the at least two fuel assemblies are close. Since the predicted critical heat flux value is proportional to the thermal diffusion coefficient, the deviation from nucleate boiling ratio of the target fuel assembly calculated by the critical heat flux test value of the target fuel assembly and its predicted critical heat flux value can be used to characterize the minimum deviation from nucleate boiling ratio of the hybrid core.

[0035] Alternatively, the deviation from nucleate boiling ratio is determined by the following formula:

[0036] DNBR=CHF 试验值 / CHF 预测值

[0037] Where DNBR is the deviation from nucleate boiling ratio, CHF 试验值 is the critical heat flux test value, CHF 预测值 is the predicted value of critical heat flux.

[0038] The embodiment of the present application compares the thermal diffusion coefficients of at least two fuel assemblies and determines the fuel assembly with the largest thermal diffusion coefficient among the at least two fuel assemblies as the target fuel assembly, thereby improving the efficiency and accuracy of determining the target fuel assembly, and further improving the efficiency and accuracy of determining the deviation from the nucleate boiling ratio design limit of the hybrid core.

[0039] In another embodiment, determining a target fuel assembly among at least two fuel assemblies in step S102 includes:

[0040] Determining experimentally the departure from nucleate boiling ratios of at least two fuel assemblies;

[0041] The fuel assembly having the smallest deviation from nucleate boiling ratio among the at least two fuel assemblies is determined as the target fuel assembly.

[0042] The embodiment of the present application determines the deviation from nucleate boiling ratio of at least two fuel assemblies through experiments, and determines the fuel assembly with the smallest deviation from nucleate boiling ratio among the at least two fuel assemblies as the target fuel assembly, which can improve the efficiency and accuracy of determining the target fuel assembly, and further improve the efficiency and accuracy of determining the design limit of the deviation from nucleate boiling ratio of the hybrid core.

[0043] Optionally, the deviation from nucleate boiling ratio of the target fuel assembly in the above step S103 includes deviation from nucleate boiling ratios corresponding to a plurality of first critical heat flux test points of the target fuel assembly.

[0044] Each first critical heat flux test point corresponds to a critical heat flux test condition of the target fuel assembly, and the target fuel assembly will experience a critical heat flux phenomenon under the test condition. The critical heat flux test conditions include thermal parameters such as pressure, temperature, flow rate, and gas content of the coolant fluid of the hybrid core.

[0045] like Figure 2 As shown, in the above step S103, determining the deviation from nucleate boiling ratio design limit of the hybrid core according to the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit may include:

[0046] Step S201: determining the proportion of second critical heat flux test points according to the relationship between the deviation from nucleate boiling ratios corresponding to the plurality of first critical heat flux test points and the first deviation from nucleate boiling ratio design limit; wherein the second critical heat flux test point is a test point among the plurality of first critical heat flux test points whose deviation from nucleate boiling ratio is greater than the first deviation from nucleate boiling ratio design limit;

[0047] Compare the proportion of the second critical heat flux test point with the preset proportion, step S202: determine whether the proportion of the second critical heat flux test point is lower than the preset proportion;

[0048] If the proportion of the second critical heat flux test point is greater than or equal to the preset proportion, step S203 is executed: the first deviation from nucleate boiling ratio design limit is determined as the deviation from nucleate boiling ratio design limit of the hybrid core;

[0049] If the proportion of the second critical heat flux test points is lower than the preset proportion, step S204 is executed: the first deviation from nucleate boiling ratio design limit is updated to the second deviation from nucleate boiling ratio design limit, and the process returns to step S201, until the proportion of the second critical heat flux test points is higher than or equal to the preset proportion, and the first deviation from nucleate boiling ratio design limit is determined as the deviation from nucleate boiling ratio design limit of the hybrid core;

[0050] Among them, the second deviation from nucleate boiling ratio design limit is lower than the first deviation from nucleate boiling ratio design limit.

[0051] The proportion of the second critical heat flux test points in the above step S201 is the ratio of the number of the second critical heat flux test points to the number of the first critical heat flux test points. Optionally, the preset proportion is 95%.

[0052] The embodiment of the present application determines the first deviation from nucleate boiling ratio design limit as the deviation from nucleate boiling ratio design limit of the hybrid core by utilizing the comparison result of the proportion of the second critical heat flux test point in multiple first critical heat flux test points and the preset proportion, or reduces the first deviation from nucleate boiling ratio design limit, and finally determines the first deviation from nucleate boiling ratio design limit that is smaller than the deviation from nucleate boiling ratios of 95% of the second critical heat flux test points, and uses this first deviation from nucleate boiling ratio design limit as the deviation from nucleate boiling ratio design limit of the hybrid core, which can improve the efficiency and accuracy of determining the deviation from nucleate boiling ratio design limit of the hybrid core.

[0053] In the above step S204, updating the first deviation from the nucleate boiling ratio design limit value to the second deviation from the nucleate boiling ratio design limit value may include:

[0054] reducing the first deviation from nucleate boiling ratio design limit value by a preset amplitude to obtain a second deviation from nucleate boiling ratio design limit value;

[0055] The preset amplitude may be in the range of 0.01 to 0.02. When the proportion of the second critical heat flux test point is lower than the preset proportion, the first deviation from nucleate boiling ratio design limit may be reduced by 0.01 to 0.02 to obtain the second deviation from nucleate boiling ratio design limit.

[0056] In the embodiment of the present application, when the proportion of the second critical heat flux test point in multiple first critical heat flux test points is less than a preset proportion, the first deviation from nucleate boiling ratio design limit is reduced by a preset amplitude, and finally a first deviation from nucleate boiling ratio design limit that is smaller than the deviation from nucleate boiling ratios of 95% of the second critical heat flux test points is determined, and this first deviation from nucleate boiling ratio design limit is used as the deviation from nucleate boiling ratio design limit of the hybrid core, which can not only improve the efficiency and accuracy of determining the deviation from nucleate boiling ratio design limit of the hybrid core, but also ensure the practicality of the determined deviation from nucleate boiling ratio design limit of the hybrid core.

[0057] In one embodiment, before determining the proportion of the second critical heat flux test points according to the relationship between the deviation from nucleate boiling ratio corresponding to the plurality of first critical heat flux test points and the first deviation from nucleate boiling ratio design limit, the method for determining the deviation from nucleate boiling ratio design limit of the hybrid core provided in the embodiment of the present application further includes:

[0058] Obtaining critical heat flux test values ​​corresponding to a plurality of first critical heat flux test points;

[0059] Determine the predicted critical heat flux values ​​corresponding to the plurality of third critical heat flux test points according to the thermal parameters of the plurality of third critical heat flux test points of the target fuel assembly and the thermal diffusion coefficient of the target fuel assembly in combination with the critical heat flux relationship of the first fuel assembly;

[0060] For each first critical heat flux test point, the ratio of the critical heat flux test value corresponding to the first critical heat flux test point to the critical heat flux prediction value corresponding to the fourth critical heat flux test point is determined as the deviation from nucleate boiling ratio corresponding to the first critical heat flux test point;

[0061] Among them, the fourth critical heat flux test point is a test point among multiple third critical heat flux test points corresponding to the first critical heat flux test point; the thermal parameters of multiple third critical heat flux test points are calculated based on the sub-channel thermal safety analysis model of the hybrid core.

[0062] The embodiment of the present application obtains the critical heat flux test value corresponding to each first critical heat flux test point of the target fuel assembly, and based on the thermal parameters of each third critical heat flux test point and the thermal diffusion coefficient of the target fuel assembly, combined with the critical heat flux relationship of the first fuel assembly, determines the critical heat flux prediction value corresponding to each third critical heat flux test point, and further based on the third critical heat flux test point determined corresponding to the first critical heat flux test point, can quickly and accurately determine the deviation from nucleate boiling ratio corresponding to each first critical heat flux test point of the target fuel assembly, thereby improving the efficiency and accuracy of determining the deviation from nucleate boiling ratio design limit of the hybrid core based on the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit.

[0063] Optionally, the above-mentioned acquisition of critical heat flux test values ​​corresponding to multiple first critical heat flux test points includes: acquiring the thermal parameter range of the hybrid core; within the thermal parameter range, fixing the first thermal parameter of the coolant fluid of the hybrid core, and adjusting other thermal parameters of the coolant fluid by stepwise increasing the heating power of the test device; when under a certain set of thermal parameters, the wall temperature of the heating element of the test section of the target fuel assembly rises and is difficult to stabilize, it is determined that the target fuel assembly has a critical heat flux phenomenon, and the test condition composed of the set of thermal parameters is determined as a first critical heat flux test point of the target fuel assembly, and the heat flux at this time is determined as the critical heat flux test value corresponding to the first critical heat flux test point. Among them, the thermal parameter range of the hybrid core can be determined according to the in-core characteristics of the hybrid core under normal operating conditions and accident conditions.

[0064] The embodiment of the present application can accurately determine the critical heat flux test values ​​corresponding to multiple first critical heat flux test points through the critical heat flux test, thereby improving the efficiency and accuracy of determining the deviation from the nucleate boiling ratio design limit of the hybrid core.

[0065] Optionally, the sub-channel thermal safety analysis model of the hybrid core is obtained by dividing the hybrid core into a plurality of small and interconnected channels, and there is an exchange of mass, momentum and energy between the channels.

[0066] In one embodiment, the above-mentioned method of determining the critical heat flux prediction values ​​corresponding to the plurality of third critical heat flux test points according to the thermal parameters of the plurality of third critical heat flux test points of the target fuel assembly and the thermal diffusion coefficient of the target fuel assembly in combination with the critical heat flux relationship of the first fuel assembly includes:

[0067] For each third critical heat flux test point, the thermal parameters of the third critical heat flux test point and the thermal diffusion coefficient of the target fuel assembly are substituted into the critical heat flux relationship of the first fuel assembly to obtain the critical heat flux prediction value corresponding to the third critical heat flux test point.

[0068] Optionally, the critical heat flux density of the first fuel assembly is related to CHF 预测值 =f(P,G,X,TDC,dg), where CHF 预测值 is the predicted critical heat flux density corresponding to the third critical heat flux density test point, P, G, and X are the thermal parameters of the third critical heat flux density test point calculated based on the sub-channel thermal safety analysis model of the hybrid core, where P is the pressure of the coolant fluid, G is the flow rate of the coolant fluid, X is the gas content of the coolant fluid, TDC is the thermal diffusion coefficient of the target fuel assembly, and dg is the grid height of the hybrid core.

[0069] The embodiment of the present application can accurately determine the critical heat flux density prediction value corresponding to the third critical heat flux density test point by substituting the thermal parameters of the third critical heat flux density test point and the thermal diffusion coefficient of the target fuel assembly into the critical heat flux density relationship of the first fuel assembly, thereby improving the efficiency and accuracy of determining the deviation from the nucleate boiling ratio design limit of the hybrid core.

[0070] In one embodiment, before determining the ratio of the critical heat flux test value corresponding to the first critical heat flux test point to the critical heat flux prediction value corresponding to the fourth critical heat flux test point as the deviation from nucleate boiling ratio corresponding to the first critical heat flux test point, the method for determining the design limit of the deviation from nucleate boiling ratio of the hybrid core provided in the embodiment of the present application further includes:

[0071] For each first critical heat flux test point, determining a deviation between the first critical heat flux test point and a plurality of third critical heat flux test points;

[0072] The third critical heat flux test point corresponding to the deviation within the preset range is determined as the fourth critical heat flux test point.

[0073] The embodiment of the present application can accurately determine, for each first critical heat flux test point, a fourth critical heat flux test point corresponding to the first critical heat flux test point among the multiple third critical heat flux test points based on the deviation between the first critical heat flux test point and the multiple third critical heat flux test points, thereby improving the accuracy of determining the deviation from nucleate boiling ratio corresponding to the first critical heat flux test point based on the critical heat flux test value corresponding to the first critical heat flux test point and the critical heat flux prediction value corresponding to the fourth critical heat flux test point, thereby improving the efficiency and accuracy of determining the deviation from nucleate boiling ratio design limit of the hybrid core.

[0074] Optionally, the deviation between the first critical heat flux test point and the plurality of third critical heat flux test points includes at least one of the following:

[0075] a positional deviation between the first position and each second position on the target fuel assembly;

[0076] Deviation of the same thermal parameter between the first critical heat flux test point and each third critical heat flux test point;

[0077] Among them, the first position is the position where the critical heat flux phenomenon occurs on the target fuel assembly corresponding to the first critical heat flux test point, and the second position is the position where the critical heat flux phenomenon occurs on the target fuel assembly corresponding to the third critical heat flux test point.

[0078] Optionally, the target range and the preset range may be the same range, or different ranges.

[0079] Optionally, the preset range includes at least one of the following:

[0080] -10cm≤position deviation≤10cm;

[0081] -10%≤Deviation of the same thermal parameters≤10%.

[0082] Optionally, when the thermal parameters include temperature, pressure, flow rate, and gas content, to determine that -10% ≤ the deviation of the same thermal parameter ≤ 10%, the following conditions must be met at the same time:

[0083] -10%≤Temperature deviation≤10%;

[0084] -10%≤Pressure deviation≤10%;

[0085] -10% ≤ flow deviation ≤ 10%;

[0086] -10%≤The deviation of gas content is ≤10%.

[0087] The embodiment of the present application can accurately determine the fourth critical heat flux test point corresponding to the first critical heat flux test point among multiple third critical heat flux test points based on the position deviation between the first position and each second position on the target fuel assembly, and / or the deviation of the same thermal parameter between the first critical heat flux test point and each third critical heat flux test point, thereby improving the accuracy of determining the deviation from the nucleate boiling ratio corresponding to the first critical heat flux test point based on the critical heat flux test value corresponding to the first critical heat flux test point and the critical heat flux prediction value corresponding to the fourth critical heat flux test point, thereby improving the efficiency and accuracy of determining the deviation from the nucleate boiling ratio design limit of the hybrid core.

[0088] See also Figure 3 The embodiment of the present application further provides a hybrid core deviation from the nucleate boiling ratio design limit determination system (DNBR determination system) 300, which can implement the above hybrid core deviation from the nucleate boiling ratio design limit determination method, the hybrid core includes at least two fuel assemblies, the full core of the hybrid core is composed of the first fuel assembly of the at least two fuel assemblies, the system includes an acquisition module 301, a fuel assembly determination module 302 and a design limit determination module 303;

[0089] The acquisition module 301 is used to acquire the first deviation from the nucleate boiling ratio design limit of the whole core;

[0090] The fuel assembly determination module 302 is used to determine a target fuel assembly among at least two fuel assemblies, wherein the deviation from nucleate boiling ratio of the target fuel assembly represents a minimum deviation from nucleate boiling ratio of the hybrid core;

[0091] The design limit determination module 303 is used to determine the deviation from nucleate boiling ratio design limit of the hybrid core according to the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit.

[0092] The system for determining the design limit value of the hybrid core deviation from the nucleate boiling ratio provided in the embodiment of the present application can implement the various steps of the above-mentioned method for determining the design limit value of the hybrid core deviation from the nucleate boiling ratio, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0093] Alternatively, if Figure 4As shown, the embodiment of the present application also provides an electronic device 400, including a processor 401 and a memory 402, the memory 402 stores a program or instruction that can be run on the processor 401, and the program or instruction is executed by the processor 401 to implement the various steps of the embodiment of the method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio, and can achieve the same technical effect, so it will not be repeated here to avoid repetition. It should be noted that the electronic device in the embodiment of the present application includes the above-mentioned mobile electronic device and non-mobile electronic device.

[0094] Figure 5 A schematic diagram of the hardware structure of an electronic device for implementing an embodiment of the present application is provided, wherein the electronic device includes:

[0095] The processor 501 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0096] The memory 502 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 502 can store an operating system and other application programs. When the technical solution provided in the embodiments of this specification is implemented by software or firmware, the relevant program code is stored in the memory 502, and the processor 501 calls and executes the method for determining the deviation of the hybrid core from the nucleate boiling ratio design limit of the embodiment of the present application;

[0097] Input / output interface 503, used to implement information input and output;

[0098] Communication interface 504, used to realize communication interaction between the device and other devices, which can be realized by wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.);

[0099] A bus 505 that transmits information between the various components of the device (e.g., the processor 501, the memory 502, the input / output interface 503, and the communication interface 504);

[0100] The processor 501 , the memory 502 , the input / output interface 503 and the communication interface 504 are connected to each other in communication within the device via the bus 505 .

[0101] The electronic device provided in the embodiment of the present application can implement each step of the above-mentioned method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0102] An embodiment of the present application also provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each step of the above-mentioned method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0103] The processor is the processor in the electronic device described in the above embodiment. The computer-readable storage medium includes a computer-readable storage medium such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0104] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various steps of the above-mentioned method for determining the deviation of the hybrid core from the design limit of the nucleate boiling ratio, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0105] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0106] An embodiment of the present application provides a computer program product, which is stored in a storage medium. The program product is executed by at least one processor to implement the various steps of the method for determining the deviation of the nucleate boiling ratio of a hybrid core from the above-mentioned design limit, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0107] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0108] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0109] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for determining the deviation of a hybrid core from a design limit of nucleate boiling ratio, characterized in that: The hybrid core includes at least two fuel assemblies, and the full core of the hybrid core is composed of a first fuel assembly of the at least two fuel assemblies. The determination method includes: Obtaining a first deviation from nucleate boiling ratio design limit value of the whole core; determining a target fuel assembly among the at least two fuel assemblies, wherein the deviation from nucleate boiling ratio of the target fuel assembly represents a minimum deviation from nucleate boiling ratio of the hybrid core; The deviation from nucleate boiling ratio design limit of the hybrid core is determined based on the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit.

2. The determination method according to claim 1, characterized in that: The deviation from nucleate boiling ratio of the target fuel assembly includes deviation from nucleate boiling ratios corresponding to a plurality of first critical heat flux test points of the target fuel assembly; The step of determining the deviation from nucleate boiling ratio design limit of the hybrid core according to the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit includes: According to the relationship between the deviation from nucleate boiling ratios corresponding to the plurality of first critical heat flux test points and the first deviation from nucleate boiling ratio design limit, determining the proportion of the second critical heat flux test points; the second critical heat flux test point is a test point among the plurality of first critical heat flux test points where the deviation from nucleate boiling ratio is greater than the first deviation from nucleate boiling ratio design limit; Comparing the proportion of the second critical heat flux test point with the preset proportion; If the proportion of the second critical heat flux test points is higher than or equal to the preset proportion, the first deviation from nucleate boiling ratio design limit is determined as the deviation from nucleate boiling ratio design limit of the hybrid core.

3. The determination method according to claim 2, characterized in that: After the step of comparing the proportion of the second critical heat flux test point with the preset proportion, the determination method further includes: If the proportion of the second critical heat flux test points is lower than the preset proportion, the first deviation from nucleate boiling ratio design limit is updated to the second deviation from nucleate boiling ratio design limit, and the step of determining the proportion of the second critical heat flux test points according to the relationship between the deviation from nucleate boiling ratios corresponding to the plurality of first critical heat flux test points and the first deviation from nucleate boiling ratio design limit is returned to be executed until the proportion of the second critical heat flux test points is higher than or equal to the preset proportion, and the first deviation from nucleate boiling ratio design limit at this time is determined as the deviation from nucleate boiling ratio design limit of the hybrid core; Wherein, the second deviation from nucleate boiling ratio design limit is lower than the first deviation from nucleate boiling ratio design limit.

4. The determination method according to claim 2, characterized in that: Before determining the proportion of the second critical heat flux test points according to the relationship between the deviation from nucleate boiling ratios corresponding to the plurality of first critical heat flux test points and the first deviation from nucleate boiling ratio design limit, the determination method further includes: Obtaining critical heat flux test values ​​corresponding to the plurality of first critical heat flux test points; Determine the predicted critical heat flux values ​​corresponding to the plurality of third critical heat flux test points according to the thermal parameters of the plurality of third critical heat flux test points of the target fuel assembly and the thermal diffusion coefficient of the target fuel assembly, in combination with the critical heat flux relationship of the first fuel assembly; For each first critical heat flux test point, a ratio of a critical heat flux test value corresponding to the first critical heat flux test point to a critical heat flux prediction value corresponding to a fourth critical heat flux test point is determined as a deviation from nucleate boiling ratio corresponding to the first critical heat flux test point; Among them, the fourth critical heat flux density test point is a test point among the multiple third critical heat flux density test points corresponding to the first critical heat flux density test point; the thermal parameters of the multiple third critical heat flux density test points are calculated based on the sub-channel thermal safety analysis model of the hybrid core.

5. The determination method according to claim 4, characterized in that: Before determining the ratio of the critical heat flux test value corresponding to the first critical heat flux test point to the critical heat flux prediction value corresponding to the fourth critical heat flux test point as the deviation from nucleate boiling ratio corresponding to the first critical heat flux test point, the determination method further includes: For each of the first critical heat flux test points, determining a deviation between the first critical heat flux test point and the plurality of third critical heat flux test points; The third critical heat flux test point corresponding to the deviation within the preset range is determined as the fourth critical heat flux test point.

6. The determination method according to claim 1, characterized in that: The determining a target fuel assembly among the at least two fuel assemblies comprises: The fuel assembly with the largest thermal diffusion coefficient among the at least two fuel assemblies is determined as the target fuel assembly.

7. A system for determining the deviation of a hybrid core from a design limit of nucleate boiling ratio, characterized in that: The hybrid core includes at least two fuel assemblies, the full core of the hybrid core is composed of the first fuel assembly of the at least two fuel assemblies, and the determination system includes an acquisition module, a fuel assembly determination module and a design limit determination module; The acquisition module is used to acquire a first deviation from the nucleate boiling ratio design limit value of the whole core; The fuel assembly determination module is used to determine a target fuel assembly among the at least two fuel assemblies, wherein the deviation from nucleate boiling ratio of the target fuel assembly represents a minimum deviation from nucleate boiling ratio of the hybrid core; The design limit determination module is used to determine the deviation from nucleate boiling ratio design limit of the hybrid core according to the relationship between the deviation from nucleate boiling ratio of the target fuel assembly and the first deviation from nucleate boiling ratio design limit.

8. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the method for determining the hybrid core deviation from the nucleate boiling ratio design limit value as described in any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for determining the hybrid core deviation from the nucleate boiling ratio design limit value according to any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that The computer program product is stored in a storage medium, and when the computer program product is executed by at least one processor, it implements the method for determining the hybrid core deviation from the nucleate boiling ratio design limit according to any one of claims 1 to 6.

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