Method for determining the activated core density and product

Abstract

The application provides a method for determining an activated core density and a product, and relates to the technical field of nuclear control. The method comprises the following steps: obtaining the state of a pressurized water reactor core; obtaining the cooling water pressure in the pressurized water reactor core and the superheat degree of the surface of a fuel rod when the pressurized water reactor core is in a boiling state. According to the cooling water pressure in the pressurized water reactor core, a contact angle influencing term corresponding to the cooling water pressure can be determined. According to the cooling water pressure, the superheat degree of the surface of the fuel rod and the contact angle influencing term, the target activated core density of the bubbles of the cooling water in the pressurized water reactor core is determined. In this way, the contact angle influencing term corresponding to the cooling water pressure can be determined according to the value range of the cooling water pressure, and then the target activated core density of the bubbles of the cooling water can be determined according to the cooling water pressure, the superheat degree of the surface of the fuel rod and the contact angle influencing term, so that the accuracy of the calculation of the target activated core density of the bubbles can be improved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear control technology, and in particular to a method and product for determining activated core density. Background Art

[0002] Commonly used active core density models in boiling heat transfer simulation research include the Lemmert & Chawla model, the Basu model, the Wang & Dhir model, and the Hibiki & Ishii model. Most of these models, such as the Lemmert & Chawla model, the Basu model, and the Wang & Dhir model, are developed based on low-pressure experimental data. Due to the high pressure within a pressurized water reactor (PWR) core, using these models to calculate the active core density of bubbles in the PWR core results in low accuracy. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a method and product for determining the activated core density, so as to improve the calculation accuracy of the activated core density of bubbles in the core of a pressurized water reactor.

[0004] In a first aspect, an embodiment of the present application provides a method for determining activation core density, the method comprising:

[0005] Get the status of the PWR core;

[0006] When the PWR core is in a boiling state, obtain the cooling water pressure in the PWR core and the superheat of the fuel rod surface;

[0007] Determine the contact angle influence term corresponding to the cooling water pressure;

[0008] The target activation core density of the cooling water bubbles in the pressurized water reactor core is determined based on the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influencing factors.

[0009] In some embodiments, determining a target activation core density of bubbles of cooling water within a pressurized water reactor core based on cooling water pressure, superheat of a fuel rod surface, and contact angle influencing terms includes:

[0010] Determine the initial activation core density of the cooling water bubbles in the PWR core based on the cooling water pressure, the superheat of the fuel rod surface, and the contact angle.

[0011] Determine the maximum activation core density threshold of the bubbles according to the average diameter of the bubbles in a preset period;

[0012] The target activation core density of the bubbles is determined based on the initial activation core density and the maximum activation core density threshold.

[0013] In some embodiments, determining the maximum activation core density threshold of the bubbles based on the average diameter of the bubbles within a preset period includes:

[0014] Get the expression of the maximum activated core density of bubbles;

[0015] Obtain the average diameter of the bubbles within a preset period;

[0016] Substituting the average diameter into the maximum activation core density expression, the maximum activation core density threshold of bubbles is obtained.

[0017] In some embodiments, determining the initial activated core density of cooling water bubbles in a pressurized water reactor core based on cooling water pressure, superheat of a fuel rod surface, and contact angle influencing terms includes:

[0018] Determine the pressure influence item and parameter item corresponding to the cooling water pressure according to the cooling water pressure;

[0019] Determine the superheat influence item based on the superheat;

[0020] The product of the contact angle influence term, the pressure influence term, the superheat influence term and the parameter term is determined as the initial activated core density of the bubbles of cooling water in the core of the pressurized water reactor.

[0021] In some embodiments, determining a contact angle influence term corresponding to cooling water pressure includes:

[0022] When the cooling water pressure is less than the preset pressure, the contact angle influence term satisfies formula (1):

[0023] (1)

[0024] When the cooling water pressure is greater than or equal to the preset pressure, the contact angle influence term satisfies formula (2):

[0025] (2)

[0026] in, represents the contact angle influence term, 、 、 、 、 、 represents a constant coefficient, Indicates cooling water pressure.

[0027] In some embodiments, obtaining an average diameter of bubbles within a preset period includes:

[0028] Obtain bubble growth time, bubble nucleation interval time and bubble detachment diameter;

[0029] Based on the bubble growth time and bubble nucleation interval, the relationship between bubble diameter and time change is determined;

[0030] The average diameter of the bubble in one growth cycle is determined based on the relationship between the bubble diameter and time, the bubble growth time, and the bubble nucleation interval.

[0031] In some embodiments, obtaining the maximum activated core density expression of bubbles comprises:

[0032] Get any three adjacent bubbles when the bubbles are fully distributed;

[0033] Determine the target triangle area based on the line connecting the centers of three adjacent bubbles;

[0034] The expression for the maximum activated core density of bubbles is determined based on the bubble coverage area in the target triangle area, the area of ​​the target triangle area, and the projected area of ​​a single bubble.

[0035] In some embodiments, determining a target activated core density of bubbles based on the initial activated core density and the maximum activated core density threshold comprises:

[0036] When the initial activation core density is less than or equal to the maximum activation core density threshold, the initial activation core density is determined as the target activation core density of the bubble;

[0037] When the initial activated core density is greater than the maximum activated core density threshold, the maximum activated core density threshold is determined as the target activated core density of the bubbles.

[0038] In a second aspect, an embodiment of the present application provides a device for determining activation core density, the device comprising:

[0039] A first acquisition module is used to obtain the status of the pressurized water reactor core;

[0040] a second acquisition module, configured to acquire the cooling water pressure in the PWR core and the superheat of the fuel rod surface when the PWR core is in a boiling state;

[0041] A first determining module, configured to determine a pressure influence item corresponding to the cooling water pressure;

[0042] The second determination module is used to determine the target activation core density of bubbles of cooling water in the core of the pressurized water reactor according to the superheat of the fuel rod surface and the pressure influence item.

[0043] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0044] a memory configured to store instructions; and

[0045] The processor is configured to call the instruction from the memory and implement the method for determining the activation core density provided in the first aspect of the embodiment of the present application when executing the instruction.

[0046] In a fourth aspect, an embodiment of the present application provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the method for determining the activation core density provided in the first aspect of the embodiment of the present application.

[0047] In an embodiment of the present application, the state of the pressurized water reactor core is first obtained. When the pressurized water reactor core is in a boiling state, the cooling water pressure in the pressurized water reactor core and the superheat of the fuel rod surface are obtained. According to the cooling water pressure in the pressurized water reactor core, the contact angle influence term corresponding to the cooling water pressure can be determined. Then, according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term, the initial activation core density of the bubbles of the cooling water in the pressurized water reactor core is determined. In this way, the contact angle influence term corresponding to the cooling water pressure can be determined according to its value range, and then the target activation core density of the bubbles of the cooling water can be determined according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term, which can improve the accuracy of the calculation of the target activation core density of the bubbles of the cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 1 is a flow chart of a method for determining activation core density provided in an embodiment of the present application;

[0049] Figure 2 Schematic diagram of the bubble diameter variation law provided in the embodiment of the present application;

[0050] Figure 3 Schematic diagram of the arrangement of bubbles provided in an embodiment of the present application;

[0051] Figure 4 is a flow chart of a method for determining activation core density provided in a specific embodiment of the present application;

[0052] Figure 5 Schematic diagram of the structure of the device for determining the activation core density provided in an embodiment of the present application;

[0053] Figure 6 It is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0055] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "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.

[0056] The method for determining the activation core density and the electronic device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0057] See Figure 1 , is a flow chart of a method for determining activation core density provided in an embodiment of the present application, which is applied to electronic devices. Figure 1 As shown, the method for determining the activation core density includes the following steps S100 to S300.

[0058] Step S100: Acquire the status of the pressurized water reactor core.

[0059] In the embodiment of the present application, the state of the pressurized water reactor core may include but is not limited to a normal operating state, a critical state, a boiling state, an overload state, and a shutdown state.

[0060] Step S200: When the PWR core is in a boiling state, obtain the cooling water pressure in the PWR core and the superheat of the fuel rod surface.

[0061] In the embodiment of the present application, when the pressurized water reactor core is in a boiling state, the boiling water on the fuel rod surface generates bubbles. Therefore, the activation core density of the bubbles can be detected in the boiling state. In other states, no bubbles are generated, that is, the activation core density cannot be detected.

[0062] The superheat of the fuel rod surface refers to the difference between the heating surface temperature of the fuel rod and the saturation temperature of water.

[0063] In some embodiments, the pressure of the cooling water in the PWR core can be detected by a pressure sensor. The superheat of the surface of the fuel rod can be detected by a temperature sensor detecting the heating surface temperature of the fuel rod, and obtained by calculating the difference between the heating surface temperature of the fuel rod and the saturation temperature of the water.

[0064] Step S300: determining a contact angle influence term corresponding to the cooling water pressure.

[0065] In the embodiments of the present application, the contact angle influence term refers to the contact angle between the liquid and the solid surface, and the contact angle influence term can affect the wetting behavior of the liquid on the solid surface. The size of the contact angle can depend on the interfacial tension between the liquid, the solid and the gas.

[0066] In some embodiments, to improve the calculation accuracy of the activation core density of the bubbles in the PWR core in different cooling water pressure ranges, for different cooling water pressure ranges, the calculation method of the contact angle influence term corresponding to the cooling water pressure range is set respectively. In one example, taking the cooling water pressure of 9.8 MPa as the boundary value, the contact angle influence term can be expressed as:

[0067]

[0068] In the formula, represents the contact angle influence term, , , , , , represents a constant coefficient, represents the cooling water pressure.

[0069] Step S400: determining the target activation core density of the bubbles of the cooling water in the PWR core according to the cooling water pressure, the superheat of the surface of the fuel rod and the contact angle influence term.

[0070] In the embodiments of the present application, the activation core density of the bubbles can be used to describe the generation and distribution of the bubbles in the fuel rod material. After the contact angle influence term is determined, the target activation core density of the bubbles of the cooling water in the PWR core can be determined according to the cooling water pressure, the superheat of the surface of the fuel rod and the contact angle influence term.

[0071] In some embodiments, the target activation core density of the bubbles of the cooling water in the PWR core can be expressed as:

[0072]

[0073] In the formula, represents the target activation core density of the bubbles of the cooling water, represents a parameter term, represents the contact angle influence term, represents the pressure influence term, Represents the superheat influence term.

[0074] In some embodiments, the parameter item Can be determined based on pressure. Parameter It can be expressed as:

[0075]

[0076] Where, Indicates parameter items, Indicates the cooling water pressure, 、 、 、 represents a constant coefficient.

[0077] In some embodiments, the pressure effect term It can be expressed as:

[0078]

[0079] Where, represents the pressure influence term, Indicates the cooling water pressure, 、 、 、 、 represents a constant coefficient.

[0080] In some embodiments, the superheat effect term It can be expressed as:

[0081]

[0082] Where, represents the superheat influence term, Indicates superheat, 、 Indicates a parameter item. It can be expressed as:

[0083]

[0084] Where, Indicates parameter items, Indicates the cooling water pressure, 、 、 represents a constant coefficient.

[0085] In some embodiments, the values ​​of the constant coefficients in the above formula are shown in Table 1:

[0086] Table 1

[0087]

[0088] It should be noted that the values of each constant in Table 1 are preferred values, and do not mean that the values of each constant are fixed at the values in Table 1.

[0089] Through the above steps S100-S400, the state of the pressurized water reactor core is first obtained, and in the case that the pressurized water reactor core is in a boiling state, the cooling water pressure in the pressurized water reactor core and the superheat degree of the fuel rod surface are obtained. According to the cooling water pressure in the pressurized water reactor core, the contact angle influence term corresponding to the cooling water pressure can be determined. Then, according to the cooling water pressure, the superheat degree of the fuel rod surface, and the contact angle influence term, the initial activation core density of the bubbles of the cooling water in the pressurized water reactor core is determined. In this way, the contact angle influence term corresponding to the value range of the cooling water pressure can be determined according to the value range of the cooling water pressure, and then the target activation core density of the bubbles of the cooling water can be determined according to the cooling water pressure, the superheat degree of the fuel rod surface, and the contact angle influence term, which can improve the accuracy of the calculation of the target activation core density of the bubbles of the cooling water.

[0090] In some embodiments, according to the cooling water pressure, the superheat degree of the fuel rod surface, and the contact angle influence term, the target activation core density of the bubbles of the cooling water in the pressurized water reactor core is determined, and the determination method comprises:

[0091] According to the cooling water pressure, the superheat degree of the fuel rod surface, and the contact angle influence term, the initial activation core density of the bubbles of the cooling water in the pressurized water reactor core is determined;

[0092] According to the average diameter of the bubbles in a preset period, the maximum activation core density threshold of the bubbles is determined;

[0093] According to the initial activation core density and the maximum activation core density threshold, the target activation core density of the bubbles is determined.

[0094] Specifically, after obtaining the cooling water pressure, the superheat degree of the fuel rod surface, and the contact angle influence term, the initial activation core density of the bubbles of the cooling water in the pressurized water reactor core can be determined according to the cooling water pressure, the superheat degree of the fuel rod surface, and the contact angle influence term.

[0095] In some embodiments, after obtaining the initial activation core density, the initial activation core density can also be limited by the activation core density limiting method to avoid unreasonable excessively large values that exceed the physical limit.

[0096] In some embodiments, the diameter of a boiling bubble constantly changes during its nucleation, growth, and detachment cycle. Using the instantaneous bubble diameter in the simulation would cause the maximum activated core density threshold to fluctuate dramatically, potentially affecting simulation stability. Therefore, the average bubble diameter over a preset cycle can be used instead of the instantaneous bubble diameter.

[0097] In some embodiments, the maximum activation core density threshold can be understood as the maximum value of the activation core density of the bubbles. The maximum activation core density threshold can be expressed as:

[0098]

[0099]

[0100] Where, represents the maximum activation core density threshold, Indicates the average diameter of the bubble in a preset period. Indicates the growth time of the bubble, It represents the interval time from bubble detachment to the next nucleation.

[0101] After determining the maximum activation core density threshold, it is possible to judge whether the initial activation core density is within a reasonable range based on the maximum activation core density threshold, and then determine the target activation core density of the bubbles.

[0102] By determining the maximum activation core density threshold to further determine the target activation core density of the bubbles, the activation core density of the bubbles can be determined within a reasonable range, thereby improving the accuracy of determining the activation core density of the bubbles.

[0103] In some embodiments, determining the maximum activation core density threshold of the bubbles based on the average diameter of the bubbles within a preset period includes:

[0104] Get the expression of the maximum activated core density of bubbles;

[0105] Obtain the average diameter of the bubbles within a preset period;

[0106] Substituting the average diameter into the maximum activation core density expression, the maximum activation core density threshold of bubbles is obtained.

[0107] Specifically, when determining the maximum activation core density threshold of bubbles, the maximum activation core density expression of bubbles is first obtained. The maximum activation core density expression of bubbles can be expressed as:

[0108]

[0109] Where, represents the maximum activation core density of bubbles, Indicates the diameter of the bubble.

[0110] Next, the average diameter of the bubbles within a preset period is obtained. The preset period can be understood as the nucleation, growth, and detachment cycle of a boiling bubble. After determining the maximum activation core density expression for the average diameter of the bubbles within the preset period, substitute the average diameter of the bubbles within the preset period into the maximum activation core density expression to determine the maximum activation core density threshold of the bubbles.

[0111] By determining the maximum activation core density threshold of the bubbles according to the average diameter of the bubbles in a preset period, the stability of the maximum activation core density threshold can be improved, thereby improving the accuracy of determining the activation core density of the bubbles.

[0112] In some embodiments, determining the initial activated core density of cooling water bubbles in a pressurized water reactor core based on cooling water pressure, superheat of a fuel rod surface, and contact angle influencing terms includes:

[0113] Determine the pressure influence item and parameter item corresponding to the cooling water pressure according to the cooling water pressure;

[0114] Determine the superheat influence item based on the superheat;

[0115] The product of the contact angle influence term, the pressure influence term, the superheat influence term and the parameter term is determined as the initial activated core density of the bubbles of cooling water in the core of the pressurized water reactor.

[0116] Specifically, after obtaining the cooling water pressure in the PWR core and the superheat of the fuel rod surface, the pressure influence term corresponding to the cooling water pressure can be determined according to the cooling water pressure. and parameter items , the superheat effect can be determined based on the superheat of the fuel rod surface .

[0117] Among them, the pressure influence term satisfies , the parameter items satisfy , the superheat influence term satisfies .

[0118] In some embodiments, the parameter item The recommended value is 1000. However, in order to further improve the accuracy of the calculation when performing simulation calculations under different pressure conditions, this parameter can also be modified. The pressure range and the recommended value range of the parameter are shown in Table 2:

[0119] Table 2

[0120]

[0121] It should be noted that the pressure range and the parameter item value range in Table 2 are preferred ranges, and do not mean that the pressure range and the parameter item value range are fixed to the value range in Table 2.

[0122] In some embodiments, the product of the contact angle influence term , the pressure influence term , the superheat influence term and the parameter term is determined as the initial activation core density of the bubble of the cooling water in the core of the pressurized water reactor .

[0123] By determining the initial activation core density of the bubble according to the contact angle influence term, the pressure influence term, the superheat influence term and the parameter term, the accuracy of the determination of the activation core density of the bubble can be improved.

[0124] In some embodiments, the contact angle influence term corresponding to the cooling water pressure is determined, including:

[0125] In the case that the cooling water pressure is less than a preset pressure, the contact angle influence term satisfies formula (1):

[0126] (1)

[0127] In the case that the cooling water pressure is greater than or equal to the preset pressure, the contact angle influence term satisfies formula (2):

[0128] (2)

[0129] wherein, represents the contact angle influence term, , , , , , represents a constant coefficient, represents the cooling water pressure.

[0130] Specifically, the existing activation core density model is developed based on low pressure experimental data. In the case that the pressure in the core of the pressurized water reactor is high, the accuracy of the calculation of the existing activation core density model is low. Therefore, in the embodiments of the present application, a preset pressure is first determined. The preset pressure can be understood as a critical value of the pressure value range. In an example, the preset pressure can be valued at 9.8 MPa. And in the case that the cooling water pressure is less than the preset pressure, and the cooling water pressure is greater than or equal to the preset pressure, the formula of the contact angle influence term corresponding to different pressure ranges is respectively set.

[0131] By setting the formula of the contact angle influence term corresponding to different pressure ranges respectively, the formula can be applied in different pressure ranges and has good accuracy.

[0132] In some embodiments, the average diameter of the bubble in a preset period is obtained, including:

[0133] The growth time of the bubble, the nucleation interval time of the bubble, and the detachment diameter of the bubble are obtained.

[0134] Based on the growth time of the bubble and the nucleation interval time of the bubble, a relationship between the diameter of the bubble and time is determined.

[0135] According to the relationship between the diameter of the bubble and time, the growth time of the bubble, and the nucleation interval time of the bubble, the average diameter of the bubble in a growth period is determined.

[0136] Specifically, please refer to Figure 2 is a schematic diagram of the bubble diameter variation rule provided by the embodiments of the present application. In Figure 2 , the abscissa is time, and the ordinate is the bubble diameter. represents the growth time of the bubble, represents the interval time from the detachment of the bubble to the next nucleation. In the growth process of the boiling bubble, the bubble diameter increases linearly.

[0137] In the growth process, the relationship between the diameter of the bubble and time can be represented as:

[0138]

[0139] In the formula, represents the detachment diameter of the bubble, i.e. the diameter of the bubble at the detachment moment, represents the growth time of the bubble, represents the interval time from the detachment of the bubble to the next nucleation.

[0140] Based on the above relationship, i.e. the average diameter of the bubble in a preset period in a nucleation-growth-detachment cycle can be represented as:

[0141]

[0142] In the formula, represents the average diameter of the bubble in a preset period, represents the growth time of the bubble, represents the interval time from the detachment of the bubble to the next nucleation.

[0143] By determining the average diameter of the bubbles within a preset period, the stability of the maximum activation core density threshold can be improved, thereby improving the accuracy of determining the activation core density of the bubbles.

[0144] In some embodiments, obtaining the maximum activated core density expression of bubbles comprises:

[0145] Get any three adjacent bubbles when the bubbles are fully distributed;

[0146] Determine the target triangle area based on the line connecting the centers of three adjacent bubbles;

[0147] The expression for the maximum activated core density of bubbles is determined based on the bubble coverage area in the target triangle area, the area of ​​the target triangle area, and the projected area of ​​a single bubble.

[0148] Specifically, see Figure 3 , is a schematic diagram of the arrangement of bubbles provided in the embodiment of the present application. Figure 3 As shown, assuming that the bubbles are spherical on the heating surface, when their arrangement reaches the Figure 3 When the state shown in (a) is reached, the number of bubbles reaches the maximum limit, that is, the bubbles are in a fully distributed state. Connecting the centers of any three adjacent bubbles, we can get Figure 3 Target triangle area in (b).

[0149] The bubble diameter is In the case of , the area of ​​the target triangle is Since the target triangle area is an equilateral triangle, the area covered by the bubbles in the target triangle area is half of the area of ​​a single bubble, that is, Since the projected area of ​​a single bubble on the heating surface is , so it can be equivalently considered that there can be at most 0.5 bubbles in this triangular area. Based on this, the expression for the maximum activation core density of bubbles on the heating surface can be obtained:

[0150] .

[0151] By presetting the expression for determining the maximum activated core density of bubbles under the condition of full bubble distribution, the accuracy of the maximum activated core density can be improved.

[0152] It should be noted that in the calculation process of the activated core density, there is no restriction on the specific shape of the heating surface. The spherical shape of the bubbles on the heating surface mentioned in the above scheme is only a possible specific embodiment.

[0153] In some embodiments, determining a target activated core density of bubbles based on the initial activated core density and the maximum activated core density threshold comprises:

[0154] When the initial activation core density is less than or equal to the maximum activation core density threshold, the initial activation core density is determined as the target activation core density of the bubble;

[0155] When the initial activated core density is greater than the maximum activated core density threshold, the maximum activated core density threshold is determined as the target activated core density of the bubbles.

[0156] Specifically, when determining the maximum activation core density threshold, it is possible to judge whether the initial activation core density is within a reasonable range based on the maximum activation core density threshold, thereby determining the target activation core density of the bubbles.

[0157] In some embodiments, when the initial activation core density is less than or equal to the maximum activation core density threshold, it indicates that the initial activation core density does not exceed the maximum activation core density threshold, and the initial activation core density is determined as the target activation core density of the bubble.

[0158] In some embodiments, if the initial activated core density is greater than the maximum activated core density threshold, it indicates that the initial activated core density has exceeded the maximum activated core density threshold. In this case, it is necessary to limit the initial activated core density to within the maximum activated core density threshold, and the maximum activated core density threshold is determined as the target activated core density of the bubbles.

[0159] By determining the maximum activation core density threshold to further determine the target activation core density of the bubbles, the activation core density of the bubbles can be determined within a reasonable range, thereby improving the accuracy of determining the activation core density of the bubbles.

[0160] For easier understanding, see Figure 4 , is a flow chart of a method for determining activation core density provided in a specific embodiment of the present application. Figure 4 As shown, the calculation method may include:

[0161] Step S401: Input required parameters.

[0162] Step S402: Calculate each influencing item.

[0163] Step S403: Calculate the activation core density.

[0164] Step S404: Determine whether the threshold is reached.

[0165] Step S405: Obtaining the activation core density value.

[0166] In this specific embodiment, the specific implementation can be found in the above description and will not be repeated here.

[0167] See Figure 5 , is a schematic structural diagram of a device for determining activation core density provided in an embodiment of the present application. In a second aspect, an embodiment of the present application provides a device 50 for determining activation core density, the device 50 comprising:

[0168] A first acquisition module 51 is used to acquire the state of the pressurized water reactor core;

[0169] The second acquisition module 52 is used to obtain the cooling water pressure in the PWR core and the superheat of the fuel rod surface when the PWR core is in a boiling state;

[0170] A first determining module 53 is configured to determine a pressure influence item corresponding to the cooling water pressure;

[0171] The second determination module 54 is configured to determine a target activation core density of bubbles of cooling water in the core of the pressurized water reactor according to the superheat of the fuel rod surface and the pressure influence term.

[0172] The activation core density determination device 50 provided in the second aspect of the embodiment of the present application can implement each process implemented in the above method embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0173] See Figure 6 , is a structural diagram of an electronic device provided in an embodiment of the present application. The third aspect of the embodiment of the present application provides an electronic device 6000, including a processor 6100 and a memory 6200. The memory 6200 stores machine executable instructions that can be executed by the processor 6100. The processor 6100 can execute the machine executable instructions to implement the above-mentioned method for determining the activation core density.

[0174] A fourth aspect of an embodiment of the present application provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor implements the above-mentioned method for determining the activation core density.

[0175] In some embodiments, the embodiments of the present application further provide a computer program product, including a computer program, which implements the method for determining the activation core density according to the above embodiment when executed by a processor.

[0176] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0177] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including the instruction device, which implements the function specified in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0178] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0179] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0180] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0181] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0182] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

[0183] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for determining activation core density, characterized in that: The determination method includes: Get the status of the PWR core; When the pressurized water reactor core is in a boiling state, obtaining the cooling water pressure in the pressurized water reactor core and the superheat of the fuel rod surface; determining a contact angle influence term corresponding to the cooling water pressure, wherein the contact angle influence term is determined based on the interfacial tension between the liquid, solid, and gas in the pressurized water reactor core, and is a contact angle between the liquid and the solid surface; determining a target activation core density of bubbles of cooling water in the pressurized water reactor core according to the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influencing term; The step of determining the target activation core density of bubbles in the cooling water within the pressurized water reactor core based on the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influence term includes: determining an initial activated core density of bubbles of cooling water in the pressurized water reactor core according to the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influence term; Obtain any three adjacent bubbles when the bubbles are fully distributed; Determine a target triangle area based on a line connecting the centers of the three adjacent bubbles; Determine the maximum activation core density expression of the bubbles according to the bubble coverage area in the target triangular area, the area of ​​the target triangular area, and the projected area of ​​a single bubble; Obtaining an average diameter of the bubbles within a preset period; Substituting the average diameter into the maximum activated core density expression to obtain the maximum activated core density threshold of the bubble; The target activated core density of the bubbles is determined according to the initial activated core density and the maximum activated core density threshold.

2. The determination method according to claim 1, characterized in that The determining, based on the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influencing term, of the initial activated core density of bubbles of the cooling water in the pressurized water reactor core includes: determining a pressure influence item and a parameter item corresponding to the cooling water pressure according to the cooling water pressure; determining a superheat influence item according to the superheat; The product of the contact angle influence term, the pressure influence term, the superheat influence term and the parameter term is determined as the initial activated core density of bubbles of cooling water in the pressurized water reactor core.

3. The determination method according to claim 1, characterized in that The determining of the contact angle influence term corresponding to the cooling water pressure includes: When the cooling water pressure is less than the preset pressure, the contact angle influence term satisfies formula (1): (1) When the cooling water pressure is greater than or equal to the preset pressure, the contact angle influence term satisfies formula (2): （2） in, represents the contact angle influence term, 、 、 、 、 、 represents a constant coefficient, Indicates the cooling water pressure.

4. The determination method according to claim 1, characterized in that The obtaining of the average diameter of the bubbles within a preset period includes: Obtaining the growth time of the bubble, the nucleation interval time of the bubble, and the detachment diameter of the bubble; Determining a relationship between the diameter of the bubble and the change in time based on the growth time of the bubble and the nucleation interval of the bubble; The average diameter of the bubbles in one growth cycle is determined according to the relationship between the diameter of the bubbles and time, the growth time of the bubbles, and the nucleation interval of the bubbles.

5. The determination method according to claim 1, characterized in that: The step of determining the target activation core density of the bubbles according to the initial activation core density and the maximum activation core density threshold comprises: When the initial activated core density is less than or equal to the maximum activated core density threshold, determining the initial activated core density as the target activated core density of the bubble; In a case where the initial activated core density is greater than the maximum activated core density threshold, the maximum activated core density threshold is determined as the target activated core density of the bubbles.

6. An electronic device, characterized in that: include: a memory configured to store instructions; as well as A processor is configured to call the instructions from the memory and implement the method for determining the active core density according to any one of claims 1 to 5 when executing the instructions.

7. A machine-readable storage medium, characterized in that The machine-readable storage medium stores instructions for causing a machine to execute the method for determining the activated core density according to any one of claims 1 to 5.

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