Determination method of activation core density and product

Abstract

The invention provides an activation core density determination method and a product, and relates to the technical field of core control. The method comprises the following steps: acquiring the state of a pressurized water reactor core, and acquiring the pressure of cooling water in the pressurized water reactor core and the superheat degree of the surface of a fuel rod under the condition that the pressurized water reactor core is in a boiling state; a contact angle influence term corresponding to the cooling water pressure can be determined according to the cooling water pressure in the pressurized water reactor core. And determining the target activation core density of the bubbles of the cooling water in the pressurized water reactor core according to the pressure of the cooling water, the superheat degree of the surface of the fuel rod and the contact angle influence item. Therefore, the contact angle influence item corresponding to the cooling water pressure can be determined according to the value range of the cooling water pressure, then the target activation core density of the bubbles of the cooling water is determined according to the cooling water pressure, the superheat degree of the surface of the fuel rod and the contact angle influence item, and the calculation accuracy of the target activation 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 activation core density. Background Art

[0002] In the study of boiling heat transfer simulation, the commonly used activation core density models include Lemmert & Chawla model, Basu model, Wang & Dhir model and Hibiki & Ishii model. Most of the models such as Lemmert & Chawla model, Basu model and Wang & Dhir model are developed based on low-pressure experimental data. Due to the high pressure in the core of a pressurized water reactor, if the above models are used to calculate the activation core density of bubbles, the calculation accuracy of the activation core density of bubbles in the core of a pressurized water reactor will be low. 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 an activated core density, the method comprising:

[0005] Get the status of the PWR core;

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

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

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

[0009] In some embodiments, determining a target activation core density of bubbles of cooling water in a pressurized water reactor core according to cooling water pressure, superheat of a fuel rod surface, and a contact angle influence term comprises:

[0010] Determine the initial activation core density of the bubbles of cooling water in the core of the pressurized water reactor according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term;

[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 according to 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 according to the average diameter of the bubbles within a preset period includes:

[0014] Get the maximum activation core density expression of the bubble;

[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 the bubble is obtained.

[0017] In some embodiments, determining the initial activation core density of bubbles of cooling water in a pressurized water reactor core according to cooling water pressure, superheat of a fuel rod surface, and contact angle influence 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 activation 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]

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

[0025]

[0026] Among them, f θ (p) represents the contact angle influence term, A1, A2, A3, A4, A5, A6 represent constant coefficients, and P represents the cooling water pressure.

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

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

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

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

[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 the bubbles according to 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, used to acquire the state of the pressurized water reactor core;

[0040] The second acquisition module is used to acquire the cooling water pressure in the pressurized water reactor core and the superheat degree of the fuel rod surface when the pressurized water reactor core is in a boiling state;

[0041] A first determination module, used 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 degree and pressure influence term of the fuel rod surface.

[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, and 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 the value range of the cooling water pressure, and then according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term, the target activation core density of the bubbles of the cooling water can be determined, 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 is a schematic flow chart of a method for determining activation core density provided in an embodiment of the present application;

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

[0050] Figure 3 is a 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 It is a 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 schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] 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.

[0055] 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 terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, 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.

[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 in conjunction with the accompanying drawings through specific embodiments and their application scenarios.

[0057] See also Figure 1 , is a flow chart of a method for determining activation core density provided in an embodiment of the present application, and the method 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 state 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, the cooling water pressure in the PWR core and the superheat of the fuel rod surface are obtained.

[0061] In the embodiment of the present application, when the core of the pressurized water reactor is in a boiling state, water on the surface of the fuel rod will generate bubbles due to boiling, so the activation core density of the bubbles can be detected in the boiling state. In other states, no bubbles are generated, that is, there is no detection of the activation core density.

[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 cooling water pressure in the core of the pressurized water reactor can be detected by a pressure sensor. The superheat of the fuel rod surface can be detected by a temperature sensor to detect the heating surface temperature of the fuel rod, and can be obtained by calculating the difference between the heating surface temperature of the fuel rod and the saturation temperature of water.

[0064] Step S300: determining a contact angle influence item 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, in order to improve the calculation accuracy of the activated core density of bubbles in the core of a pressurized water reactor within different cooling water pressure ranges, for different cooling water pressure ranges, calculation methods for contact angle influence terms corresponding to the cooling water pressure ranges are respectively set. In one example, with 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, f θ (p) represents the contact angle influence term, A1, A2, A3, A4, A5, A6 represent constant coefficients, and P represents the cooling water pressure.

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

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

[0071] In some embodiments, the target activation core density of bubbles of cooling water within the core of a pressurized water reactor may be expressed as:

[0072] n=N·f θ (p)·f(p)·f(ΔT)

[0073] Where n represents the target activation core density of cooling water bubbles, N represents the parameter term, and f θ (p) represents the contact angle influence term, f(p) represents the pressure influence term, and f(ΔT) represents the superheat influence term.

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

[0075]

[0076] Wherein, N represents the parameter item, P represents the cooling water pressure, and C4, C5, C6, and C7 represent constant coefficients.

[0077] In some embodiments, the pressure effect term f(p) can be expressed as:

[0078]

[0079] Wherein, f(p) represents the pressure influence term, P represents the cooling water pressure, and B1, B2, B3, B4, and B5 represent constant coefficients.

[0080] In some embodiments, the superheat effect term f(ΔT) can be expressed as:

[0081] f(ΔT)=ΔT MΔT+N

[0082] In the formula, f(ΔT) represents the superheat influence term, ΔT represents the superheat, and M and N represent parameter terms. M can be expressed as:

[0083] M=C1P 2 +C2P+C3

[0084] Wherein, M represents the parameter item, P represents the cooling water pressure, and C1, C2, and C3 represent constant coefficients.

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

[0086] Table 1

[0087]

[0088]

[0089] It should be noted that the values ​​of the constant coefficients in Table 1 are preferred values, which does not mean that the values ​​of the constant coefficients are fixed to the values ​​in Table 1.

[0090] Through the above steps S100 to S400, the state of the PWR core is first obtained, and when the PWR core is in a boiling state, the cooling water pressure in the PWR core and the superheat of the fuel rod surface are obtained. According to the cooling water pressure in the PWR 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 PWR core is determined. In this way, the contact angle influence term corresponding to the cooling water pressure can be determined according to the value range of the cooling water pressure, and then according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term, the target activation core density of the bubbles of the cooling water can be determined, which can improve the accuracy of the calculation of the target activation core density of the bubbles of the cooling water.

[0091] In some embodiments, the target activation core density of bubbles of cooling water in a pressurized water reactor core is determined based on the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influence term, and the determination method includes:

[0092] Determine the initial activation core density of the bubbles of cooling water in the core of the pressurized water reactor according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term;

[0093] Determine the maximum activation core density threshold of the bubbles according to the average diameter of the bubbles in a preset period;

[0094] The target activation core density of the bubbles is determined according to the initial activation core density and the maximum activation core density threshold.

[0095] Specifically, after obtaining the cooling water pressure, the superheat of the fuel rod surface and the contact angle influencing terms, the initial activation core density of the cooling water bubbles in the pressurized water reactor core can be determined based on the cooling water pressure, the superheat of the fuel rod surface and the contact angle influencing terms.

[0096] In some embodiments, after obtaining the initial activated core density, the activated core density limitation method can be used to impose certain limitations on the initial activated core density to prevent it from becoming unreasonably large and exceeding the physical limit.

[0097] In some embodiments, considering that the diameter of a boiling bubble is constantly changing during the nucleation-growth-detachment cycle, if the instantaneous bubble diameter is used in the simulation, the maximum activation core density threshold will change drastically, which may affect the simulation stability. Therefore, the instantaneous diameter of the bubble can be replaced by determining the average diameter of the bubble in a preset cycle.

[0098] 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:

[0099]

[0100] Where n max represents the maximum activation core density threshold, d w represents the average diameter of the bubble in a preset period, t c represents the growth time of the bubble, t l Indicates the interval time from bubble detachment to the next nucleation.

[0101] After determining the maximum activation core density threshold, it can be judged 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 bubble.

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

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

[0104] Get the maximum activation core density expression of the bubble;

[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 the bubble is obtained.

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

[0108]

[0109] Where n' max represents the maximum activated core density of bubbles, and d represents the diameter of the bubbles.

[0110] Then obtain the average diameter of the bubble in a preset period. The preset period can be understood as the nucleation-growth-detachment period of a boiling bubble. After determining the maximum activation core density expression of the average diameter of the bubble in a preset period, substitute the average diameter of the bubble in a preset period into the maximum activation core density expression to determine the maximum activation core density threshold of the bubble.

[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 activation core density of bubbles of cooling water in a pressurized water reactor core according to cooling water pressure, superheat of a fuel rod surface, and contact angle influence 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 activation 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 pressurized water reactor core and the superheat of the fuel rod surface, the pressure influence term f(p) and the parameter term N corresponding to the cooling water pressure can be determined according to the cooling water pressure, and the superheat influence term f(ΔT) can be determined according to the superheat of the fuel rod surface.

[0117] Among them, the pressure influence term satisfies Parameters satisfy The superheat influence term satisfies f(ΔT)=ΔT MΔT+N .

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

[0119] Table 2

[0120]

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

[0122] In some embodiments, the contact angle effect term f θ The initial activated core density n of the bubbles of cooling water in the core of the pressurized water reactor is determined by the product of (p), the pressure influence term f(p), the superheat influence term f(ΔT) and the parameter term N.

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

[0124] In some embodiments, determining a contact angle influence term corresponding to cooling water pressure includes:

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

[0126]

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

[0128]

[0129] Among them, f θ (p) represents the contact angle influence term, A1, A2, A3, A4, A5, A6 represent constant coefficients, and P represents the cooling water pressure.

[0130] Specifically, the existing activated core density model is developed based on low-pressure experimental data. When the pressure in the core of a pressurized water reactor is high, the accuracy of the calculation of the existing activated core density model is disclosed. Therefore, in an embodiment of the present application, a preset pressure is first determined. The preset pressure can be understood as the critical value of the pressure range. In one example, the preset pressure can be taken as 9.8MPa. And when the cooling water pressure is less than the preset pressure, and when the cooling water pressure is greater than or equal to the preset pressure, the formulas for the contact angle influencing terms corresponding to different pressure ranges are set respectively.

[0131] By respectively setting the formulas of the contact angle influencing terms corresponding to different pressure ranges, the formula can be applicable within different pressure ranges and have good accuracy.

[0132] In some embodiments, obtaining an average diameter of bubbles within a preset period includes:

[0133] Obtain the bubble growth time, bubble nucleation interval time and bubble detachment diameter;

[0134] Based on the bubble growth time and bubble nucleation interval, determine the relationship between bubble diameter and time change;

[0135] The average diameter of the bubble in a growth cycle is determined based on the relationship between the diameter of the bubble and time, the growth time of the bubble and the interval time of the nucleation of the bubble.

[0136] Specifically, see Figure 2 , is a schematic diagram of the bubble diameter variation law provided in the embodiment of the present application. Figure 2 In the figure, the horizontal axis is time and the vertical axis is the bubble diameter. c represents the growth time of the bubble, t l It indicates the interval time from bubble detachment to the next nucleation. During the growth of boiling bubbles, the bubble diameter increases linearly.

[0137] During the growth process, the relationship between the diameter of the bubble and the time change can be expressed as:

[0138]

[0139] Where, d w represents the detachment diameter of the bubble, that is, the diameter of the bubble at the detachment moment, t crepresents the growth time of the bubble, t l Indicates the interval time from bubble detachment to the next nucleation.

[0140] Based on the above relationship, it can be determined that in a nucleation-growth-detachment cycle, the average diameter of the bubble in a preset cycle can be expressed as:

[0141]

[0142] Where, d ave represents the average diameter of the bubble in a preset period, t c represents the growth time of the bubble, t l Indicates the interval time from bubble detachment 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 fully distributed. Connecting the centers of any three adjacent bubbles, we can get Figure 3 The target triangle area in (b).

[0149] When the bubble diameter is d, 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 there are 0.5 bubbles, based on this, the maximum activation core density expression of the bubbles on the heating surface can be obtained: the projected area of ​​a single bubble on the heating surface is Therefore, it can be equivalent to assume that in this triangular area there can be at most

[0150]

[0151] By presetting an 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 the bubbles according to 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, when the initial activation core density is greater than the maximum activation core density threshold, it indicates that the initial activation core density has exceeded the maximum activation core density threshold. At this time, it is necessary to limit the initial activation core density to within the maximum activation core density threshold, and the maximum activation core density threshold is determined as the target activation core density of the bubble.

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

[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 4As 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 refer to the above description and will not be repeated here.

[0167] See also Figure 5 , is a schematic diagram of the structure 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, and the device 50 includes:

[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 acquire the cooling water pressure in the pressurized water reactor core and the superheat degree of the fuel rod surface when the pressurized water reactor core is in a boiling state;

[0170] A first determination module 53, used to determine a pressure influence item corresponding to the cooling water pressure;

[0171] The second determination module 54 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 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 again here.

[0173] See also 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, when executed by a processor, implements the method for determining the activation core density according to the above-mentioned embodiment.

[0176] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may 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 may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include 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 generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 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 an instruction device, which implements the functions 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, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0178] In a typical configuration, a computing device includes one or more processors (CPU), 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 include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 disk read-only memory (CD-ROM), digital versatile disk (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 temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0181] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0182] The above are only 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 modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

[0183] In addition, 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 comprises: Get the status of the PWR core; When the core of the pressurized water reactor is in a boiling state, obtaining the cooling water pressure in the core of the pressurized water reactor and the superheat of the surface of the fuel rod; determining a contact angle influence term corresponding to the cooling water pressure; A target activation core density of bubbles of cooling water in the core of the pressurized water reactor is determined according to the cooling water pressure, the superheat of the fuel rod surface, and the contact angle influence term.

2. The determination method according to claim 1, characterized in that: The step of determining a target activation core density of bubbles of cooling water in the core of the pressurized water reactor according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term comprises: Determining the initial activation core density of bubbles of cooling water in the core of the pressurized water reactor according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term; Determine the maximum activation core density threshold of the bubbles according to the average diameter of the bubbles in a preset period; The target activated core density of the bubbles is determined according to the initial activated core density and the maximum activated core density threshold.

3. The determination method according to claim 2, characterized in that: The step of determining the maximum activation core density threshold of the bubbles according to the average diameter of the bubbles within a preset period includes: Obtaining the maximum activated core density expression of the bubble; Obtaining an average diameter of the bubbles within a preset period; Substituting the average diameter into the maximum activated core density expression, the maximum activated core density threshold of the bubble is obtained.

4. The determination method according to claim 1, characterized in that: The step of determining the initial activation core density of bubbles of cooling water in the core of the pressurized water reactor according to the cooling water pressure, the superheat of the fuel rod surface and the contact angle influence term comprises: 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 activation core density of bubbles of cooling water in the core of the pressurized water reactor.

5. The determination method according to claim 1, characterized in that: The determining of the contact angle influence term corresponding to the cooling water pressure comprises: When the cooling water pressure is less than the preset pressure, the contact angle influence term satisfies formula (1): When the cooling water pressure is greater than or equal to the preset pressure, the contact angle influence term satisfies formula (2): Among them, the f θ (p) represents the contact angle influence term, A1, A2, A3, A4, A5, A6 represent constant coefficients, and P represents the cooling water pressure.

6. The determination method according to claim 3, 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; Determine 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 bubble in a growth cycle is determined according to the relationship between the diameter of the bubble and time, the growth time of the bubble and the nucleation interval of the bubble.

7. The determination method according to claim 3, characterized in that: The method of obtaining the maximum activation core density expression of the bubble comprises: Obtain any three adjacent bubbles of the bubble when the bubble is fully distributed; Determine a target triangular area based on a line connecting the centers of the three adjacent bubbles; The maximum activation core density expression of the bubbles is determined according to the bubble coverage area in the target triangular region, the area of ​​the target triangular region and the projection area of ​​a single bubble.

8. The determination method according to claim 2, 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; 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.

9. A device for determining activation core density, characterized in that: The determining device comprises: A first acquisition module, used to acquire the state of the pressurized water reactor core; A second acquisition module is used to acquire the cooling water pressure in the pressurized water reactor core and the superheat of the fuel rod surface when the pressurized water reactor core is in a boiling state; A first determination module, used to determine a pressure influence item corresponding to the cooling water pressure; 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.

10. 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 activated core density according to any one of claims 1 to 8 when executing the instructions.

11. 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 8.

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