Fuel rod PCI performance risk assessment method and device, storage medium and electronic equipment

Abstract

The invention discloses a fuel rod PCI performance risk assessment method and device, a storage medium and electronic equipment, and relates to the technical field of nuclear reactor fuel rod analysis. The method comprises the following steps: acquiring the current power and current burnup of a fuel rod; based on the current power and the current burnup, calculating a target limit value power corresponding to the current power and the current burnup by using a fuel rod limit value power curved surface equation, the fuel rod limiting value power curved surface equation is determined according to the initial power, the initial burnup and the limiting value power of the fuel rod at each operation moment; calculating the power margin of the fuel rod according to the target limit value power and the current power; and evaluating the PCI performance risk of the fuel rod based on the power margin. The PCI performance risk in the operation process of the fuel rod can be effectively evaluated.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear reactor fuel rod analysis, and in particular to a fuel rod PCI performance risk assessment method, device, storage medium and electronic equipment. Background Art

[0002] Fuel rods are the main form of fuel in current pressurized water reactor nuclear power plants. They consist of zirconium alloy cladding tubes, fuel cores installed in the cladding tubes, air cavity springs, and end plugs seal-welded at both ends of the cladding tubes. The zirconium alloy cladding serves as the first barrier to prevent the release of radioactive fission products, and its structural integrity is related to the safe operation of the entire reactor.

[0003] PCI (Pellet-Cladding Interaction) is a complex irradiation, thermal and mechanical behavior between fuel pellets and zirconium alloy cladding. It is mainly manifested in that the fuel rods are affected by the operating environment such as high temperature, high pressure, and neutron irradiation in the reactor. Under the combined effect of thermal expansion of the pellets, radiation swelling and inward creep of the cladding, the pellets will come into contact with the cladding. When the reactor power undergoes a transient power increase condition, the fuel pellets will produce a large outward expansion and swelling. After PCI occurs, the zirconium alloy cladding is in a high stress and strain state, which may cause the cladding to fail due to excessive stress or strain, and cause damage to the fuel rods. However, there is currently a lack of effective means to assess the PCI performance risk during fuel rod operation. Summary of the invention

[0004] In view of this, the present application provides a fuel rod PCI performance risk assessment method, device, storage medium and electronic device, which are mainly capable of effectively assessing the PCI performance risk during the operation of the fuel rod.

[0005] According to a first aspect of the present application, a fuel rod PCI performance risk assessment method is provided, the method comprising:

[0006] Get the current power and current burnup of the fuel rod;

[0007] Based on the current power and the current burnup, using a fuel rod limit power surface equation, calculating a target limit power corresponding to the current power and the current burnup, wherein the fuel rod limit power surface equation is determined according to the initial power, initial burnup and limit power of the fuel rod at each operating moment;

[0008] Calculating the power margin of the fuel rod according to the target limit power and the current power;

[0009] Based on the power margin, a PCI performance risk of the fuel rod is assessed.

[0010] According to a second aspect of the present application, a fuel rod PCI performance risk assessment device is provided, the device comprising:

[0011] An acquisition unit, used to acquire the current power and current burnup of the fuel rod;

[0012] a first calculation unit, configured to calculate, based on the current power and the current burnup, a target limit power corresponding to the current power and the current burnup by using a fuel rod limit power surface equation, wherein the fuel rod limit power surface equation is determined according to the initial power, initial burnup and limit power of the fuel rod at each operating moment;

[0013] A second calculation unit, configured to calculate a power margin of the fuel rod according to the target limit power and the current power;

[0014] An evaluation unit is used to evaluate the PCI performance risk of the fuel rod based on the power margin.

[0015] According to a third aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned fuel rod PCI performance risk assessment method is implemented.

[0016] According to the fourth aspect of the present application, an electronic device is provided, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the above-mentioned fuel rod PCI performance risk assessment method when executing the program.

[0017] By means of the above technical scheme, the present application provides a fuel rod PCI performance risk assessment method, device, storage medium and electronic device, which calculates the target limit power of the fuel rod by utilizing the fuel rod limit power surface equation and the fuel rod power and burnup monitored online in real time, and calculates the power margin of the fuel rod based on the target limit power, thereby being able to effectively assess the PCI performance risk of the fuel rod, thereby being able to ensure the safety of the nuclear reactor during operation.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A schematic diagram of a fuel rod PCI performance risk assessment method provided in an embodiment of the present application is shown;

[0021] Figure 2 A schematic flow chart of another fuel rod PCI performance risk assessment method provided in an embodiment of the present application is shown;

[0022] Figure 3 A schematic structural diagram of a fuel rod PCI performance risk assessment device provided in an embodiment of the present application is shown;

[0023] Figure 4 A schematic structural diagram of another fuel rod PCI performance risk assessment device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0025] Currently, there is a lack of effective means to assess the PCI performance risk during fuel rod operation.

[0026] In order to solve the above problems, an embodiment of the present invention provides a fuel rod PCI performance risk assessment method, such as Figure 1 As shown, the method includes:

[0027] Step 101: Obtain the current power and current burnup of the fuel rod.

[0028] The embodiment of the present invention is mainly applicable to the scenario of evaluating the PCI performance risk of fuel rods. The execution subject of the embodiment of the present invention is a device or equipment capable of evaluating the PCI performance risk of fuel rods, which can be specifically set on the server side.

[0029] In order to evaluate the PCI performance risk during fuel rod operation, it is necessary to monitor the current power and current burnup of the fuel rods online in real time.

[0030] Step 102: Based on the current power and the current burnup, a target limit power corresponding to the current power and the current burnup is calculated using a fuel rod limit power surface equation.

[0031] The fuel rod limit power surface equation is determined according to the initial power, initial burnup and limit power of the fuel rod at each operating moment. The independent variables of the fuel rod limit power surface equation are power and burnup, and the dependent variable is limit power.

[0032] In the embodiment of the present invention, the current power and current burnup of the fuel rod monitored in real time are input into the pre-constructed fuel rod limit power surface equation S(x, y) for calculation to obtain the target limit power corresponding to the current power and the current burnup.

[0033] Step 103: Calculate the power margin of the fuel rod according to the target limit power and the current power.

[0034] According to the embodiment of the present invention, after the target limit power of the fuel rod is determined, the target limit power is subtracted from the current power to obtain the power margin of the fuel rod.

[0035] Step 104: Evaluate the PCI performance risk of the fuel rod based on the power margin.

[0036] Among them, the PCI performance risk of fuel rods refers to the interaction between the nuclear fuel core and the cladding, which causes the cladding to be subjected to stress and deformation, thereby affecting the structural integrity and safety of the fuel rods.

[0037] For the embodiment of the present invention, after the power margin of the fuel rod is calculated, the PCI performance risk of the fuel rod can be determined according to the size of the power margin. For this process, step 104 specifically includes: determining the PCI performance risk level of the fuel rod based on the power range to which the power margin belongs; and evaluating the PCI performance risk of the fuel rod according to the PCI performance risk level of the fuel rod.

[0038] Specifically, the embodiment of the present invention can divide the power margin into multiple power ranges, and different power ranges correspond to different PCI performance risk levels. The larger the power margin, the lower the corresponding PCI performance risk level, and the smaller the PCI performance risk of the fuel rod; on the contrary, the smaller the power margin, the higher the corresponding PCI performance risk level, and the greater the PCI performance risk of the fuel rod.

[0039] In specific application scenarios, nuclear reactors can also adjust the power of fuel rods according to the power margin of the fuel rods during operation, control the fuel rods with high power margin to appropriately increase the power operation to improve the nuclear fuel utilization rate and ensure the economy of the nuclear power plant, and control the fuel rods with low power margin to appropriately reduce the power operation to improve the safety of the nuclear reactor.

[0040] The existing PCI performance risk assessment method usually selects several representative data to analyze the limit power and conducts performance assessment offline. However, this method is difficult to ensure that the analyzed limit power matches the actual operating power. The embodiment of the present invention uses the pre-fitted fuel rod limit power surface equation to calculate the target limit power, which can analyze the PCI performance risk of the fuel rod online in real time and ensure that the target limit power matches the actual operating power.

[0041] A fuel rod PCI performance risk assessment method provided in an embodiment of the present invention calculates the target limit power of the fuel rod by using the fuel rod limit power surface equation and the fuel rod power and burnup monitored online in real time, and calculates the power margin of the fuel rod based on the target limit power. This method can effectively assess the PCI performance risk of the fuel rod, thereby ensuring the safety of the nuclear reactor during operation.

[0042] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully illustrate the implementation of this embodiment, this embodiment also provides another fuel rod PCI performance risk assessment method, such as Figure 2 As shown, the method includes:

[0043] Step 201: Obtain the initial power, initial burnup and limit power of the fuel rod at each operating moment.

[0044] For the embodiment of the present invention, before using the fuel rod limit power surface equation to calculate the target limit power of the fuel rod, it is necessary to pre-construct the fuel rod limit power surface equation. When specifically constructing the fuel rod limit power surface equation, it is necessary to obtain the initial power, initial burnup and limit power of the fuel rod at each operating moment. For the acquisition process of the initial power, initial burnup and limit power, step 201 specifically includes: obtaining the design power history of the fuel rod; generating a virtual power history of the fuel rod according to the design power history; calculating the initial power and initial burnup of the fuel rod at each operating moment based on the virtual power history and preset fuel performance analysis software; determining the design criteria of the fuel rod according to the cladding type of the fuel rod; determining the first transient power according to the initial power and power variable at any one of the operating moments, and determining the first cladding strain change under the first transient power based on the first transient power; determining the limit power corresponding to the initial power and initial burnup at any one moment based on the first cladding strain change and the cladding strain limit corresponding to the design criteria.

[0045] Among them, the design power history is the theoretical design power of the fuel rod, that is, the fuel rod operates at a constant power history throughout the entire operation cycle, but the power of the fuel rod will fluctuate during the actual operation. Therefore, a certain offset is added on the basis of the design power history to obtain the virtual power history.

[0046] When determining the limit power corresponding to the initial power and the initial burnup at any moment, if the first cladding strain change does not exceed the cladding strain limit, the first transient power is increased to obtain the second transient power, and based on the second transient power, the second cladding strain change under the second transient power is determined; if the second cladding strain change exceeds the cladding strain limit, the first transient power is determined as the limit power corresponding to the initial power and the initial burnup at the any moment.

[0047] For the embodiment of the present invention, after generating the virtual power history of the fuel rod based on the design power history, the virtual power history, core data (neutronic parameters) and fuel rod structural parameters are input into the preset fuel performance analysis software for calculation to obtain the initial power and initial burnup of the fuel rod at each operating moment. At the same time, according to the cladding type of the fuel rod, the adopted PCI design criteria are determined, and the PCI equipment criteria include cladding strain limit, etc. The embodiment of the present invention can obtain the cladding strain change under different transient powers by applying different transient powers. Specifically, assuming that the initial power at any one moment in each operating moment is P kW / m, the initial burnup is B MWd / tU, and the first transient power corresponding to this moment is (P+△P) kW / m, then the preset fuel performance analysis software is used to determine the first cladding strain change under the first transient power. If the first transient power is (P+△P) kW / m, the first cladding strain change does not exceed the cladding strain limit corresponding to the design criterion, then the first transient power is increased to obtain the second transient power (P+△P+1) kW / m, and then the second cladding strain change under the second transient power is re-determined. If the second cladding strain change exceeds the cladding strain limit, the first transient power (P+△P) kW / m is determined as the limit power corresponding to the initial power P kW / m and the initial burnup B MWd / tU.

[0048] Further, if the first cladding strain change exceeds the cladding strain limit, the power variable is reduced, and the third transient power is determined based on the reduced power variable and the initial power at any moment, and based on the third transient power, the third cladding strain change under the third transient power is determined.

[0049] Specifically, if the first cladding strain change under the first transient power of (P+△P) kW / m exceeds the cladding strain limit, the power variable △P is appropriately reduced to obtain the third transient power, and then the third cladding strain change under the third transient power is re-determined, and the relationship between the third cladding strain change and the cladding strain limit is compared again.

[0050] Further, if the second cladding strain change does not exceed the cladding strain limit, the power variable is increased, and the fourth transient power is determined based on the increased power variable and the initial power at any moment, and based on the fourth transient power, the fourth cladding strain change under the fourth transient power is determined.

[0051] Specifically, if the second cladding strain change under the second transient power (P+△P+1) kW / m is less than the cladding strain limit, the power variable △P is appropriately increased to obtain the fourth transient power, and then the fourth cladding strain change under the fourth transient power is re-determined, and the relationship between the fourth cladding strain change and the cladding strain limit is compared again.

[0052] Through the above-mentioned method, the embodiment of the present invention can accurately determine the limit power under different power and burnup at different operating times, and form a PCI limit power database for use by the nuclear reactor online monitoring system, which can be used to evaluate the PCI performance of the fuel rod operation process and ensure the safe operation of the nuclear reactor.

[0053] Step 202: Fitting the fuel rod limit power surface equation based on the initial power, initial burnup and limit power at each operating moment.

[0054] For the embodiment of the present invention, after obtaining the initial power, initial fuel and limit power of the fuel rod at each operating time, the fuel rod limit power surface equation is fitted. For this process, step 202 specifically includes: constructing a two-dimensional polynomial equation of the fuel rod; constructing a limit power residual square sum equation based on the two-dimensional polynomial equation; taking each polynomial coefficient of the two-dimensional polynomial equation as an unknown variable, using the limit power residual square sum equation to obtain partial derivatives of the unknown variable to obtain a matrix equation of the fuel rod; solving the matrix equation based on the initial power, initial fuel consumption and limit power at each operating time to obtain values ​​corresponding to each polynomial coefficient; and determining the fuel rod limit power surface equation according to the values ​​corresponding to each polynomial coefficient.

[0055] Specifically, the two-dimensional polynomial equation of the fuel rod can be constructed in the form of a two-dimensional n-degree polynomial as shown below:

[0056] S(x,y)=a 00 +a 10 ·x+a01 y+a 11 ·x·y+....+a n-1n-1 ·x n-1 ·y n-1 +a n0 ·x n +a 0n ·y n (1)

[0057] Among them, S(x,y) is the fuel rod limit power surface equation related to initial power, initial burnup, and limit power to be fitted, x is the initial power, y is the initial burnup, a ij are the polynomial coefficients.

[0058] Furthermore, the least square method is used to fit the fuel rod limit power surface equation S(x,y). The specific formula is as follows:

[0059] δ i =(S(x i ,y i )-S i ) 2 (2)

[0060]

[0061] Among them, δ i Represents the initial power x i , the initial burnup is y i The fitting limit power S(x i ,y i ) and the actual limit power S i δ is the residual square between the limit power residual squares, and the value of the limit power residual squares equation should be minimized when the least squares method is used for fitting.

[0062] Furthermore, we use formula (3) to find partial derivatives of each polynomial coefficient. n0 Taking the partial derivative as an example, the specific formula is as follows:

[0063]

[0064] After formula (4) is expanded, we can get:

[0065]

[0066] Furthermore, the polynomial coefficient a ij As unknown quantity, based on each polynomial coefficient a ij The corresponding formula (5) constructs the matrix equation as follows:

[0067]

[0068] After constructing the matrix equation, the polynomial coefficient a is calculated based on the initial power, initial fuel consumption and limit power at each operating time. ij The solution is obtained to obtain the fuel rod limit power surface equation.

[0069] Step 203: Obtain the current power and current burnup of the fuel rod.

[0070] According to the embodiment of the present invention, the current power and current burnup of the fuel rods are monitored online in real time.

[0071] Step 204: Based on the current power and the current burnup, a target limit power corresponding to the current power and the current burnup is calculated using a fuel rod limit power surface equation.

[0072] The fuel rod limit power surface equation is determined according to the initial power, initial burnup and limit power of the fuel rod at each operating moment.

[0073] In the embodiment of the present invention, the current power and current burnup of the fuel rod monitored in real time are input into the pre-constructed fuel rod limit power surface equation S(x, y) for calculation to obtain the target limit power corresponding to the current power and the current burnup.

[0074] Step 205: Calculate the power margin of the fuel rod according to the target limit power and the current power.

[0075] According to the embodiment of the present invention, after the target limit power of the fuel rod is determined, the target limit power is subtracted from the current power to obtain the power margin of the fuel rod.

[0076] Step 206: Evaluate the PCI performance risk of the fuel rod based on the power margin.

[0077] For the embodiment of the present invention, the process of evaluating the PCI performance risk of the fuel rod according to the power margin is exactly the same as step 104, and will not be repeated here.

[0078] Another fuel rod PCI performance risk assessment method provided in an embodiment of the present invention calculates the target limit power of the fuel rod by utilizing the fuel rod limit power surface equation and the fuel rod power and burnup monitored online in real time, and calculates the power margin of the fuel rod based on the target limit power, thereby being able to effectively assess the PCI performance risk of the fuel rod, thereby ensuring the safety of the nuclear reactor during operation.

[0079] Further, as Figure 1 and Figure 2The specific implementation of the method shown in the embodiment provides a fuel rod PCI performance risk assessment device, such as Figure 3 As shown, the device includes: an acquisition unit 31 , a first calculation unit 32 , a second calculation unit 33 and an evaluation unit 34 .

[0080] The acquisition unit 31 can be used to acquire the current power and current burnup of the fuel rod.

[0081] The first calculation unit 32 may be configured to calculate a target limit power corresponding to the current power and the current burnup based on the current power and the current burnup using a fuel rod limit power surface equation, wherein the fuel rod limit power surface equation is determined based on the initial power, initial burnup and limit power of the fuel rod at each operating moment.

[0082] The second calculation unit 33 may be configured to calculate the power margin of the fuel rod according to the target limit power and the current power.

[0083] The evaluation unit 34 may be configured to evaluate the PCI performance risk of the fuel rod based on the power margin.

[0084] In some embodiments, Figure 4 As shown, the device further includes: a fitting unit 35.

[0085] The acquisition unit 31 may also be used to acquire the initial power, initial burnup and limit power of the fuel rod at each operating moment.

[0086] The fitting unit 35 may be used to fit the fuel rod limit power surface equation based on the initial power, initial burnup and limit power at each operating moment.

[0087] In some embodiments, the fitting unit 35 can be specifically used to construct a two-dimensional polynomial equation for the fuel rod; based on the two-dimensional polynomial equation, construct a limit power residual square sum equation; use each polynomial coefficient of the two-dimensional polynomial equation as an unknown variable, and use the limit power residual square sum equation to find partial derivatives of the unknown variables to obtain a matrix equation for the fuel rod; based on the initial power, initial fuel consumption and limit power at each operating moment, solve the matrix equation to obtain the values ​​corresponding to each polynomial coefficient; and determine the fuel rod limit power surface equation according to the values ​​corresponding to each polynomial coefficient.

[0088] In some embodiments, the second calculation unit 33 may be specifically configured to subtract the target limit power from the current power to obtain the power margin of the fuel rod.

[0089] In some embodiments, the evaluation unit 34 may be specifically configured to determine the PCI performance risk level of the fuel rod based on the power range to which the power margin belongs; and evaluate the PCI performance risk of the fuel rod according to the PCI performance risk level of the fuel rod.

[0090] In some embodiments, the acquisition unit 31 includes: an acquisition module 311 , a generation module 312 , a calculation module 313 and a determination module 314 .

[0091] The acquisition module 311 may be used to acquire the design power history of the fuel rod.

[0092] The generating module 312 may be configured to generate a virtual power history of the fuel rod according to the designed power history.

[0093] The calculation module 313 may be used to calculate the initial power and initial burnup of the fuel rod at each operating moment based on the virtual power history and preset fuel performance analysis software.

[0094] The determination module 314 may be used to determine the design criteria of the fuel rod according to the cladding type of the fuel rod.

[0095] The determination module 314 may also be configured to determine a first transient power according to the initial power and the power variable at any one of the operating moments, and determine a first cladding strain variation under the first transient power based on the first transient power.

[0096] The determination module 314 may also be configured to determine a limit power corresponding to both the initial power and the initial burnup at any moment based on the first cladding strain variation and the cladding strain limit corresponding to the design criterion.

[0097] In some embodiments, the determination module 314 can be specifically used to increase the first transient power to obtain the second transient power if the first cladding strain change does not exceed the cladding strain limit, and determine the second cladding strain change under the second transient power based on the second transient power; if the second cladding strain change exceeds the cladding strain limit, determine the first transient power as the limit power corresponding to the initial power and the initial burnup at any one moment.

[0098] In some embodiments, the determination module 314 can also be used to reduce the power variable if the first cladding strain change exceeds the cladding strain limit, determine the third transient power based on the reduced power variable and the initial power at any moment, and determine the third cladding strain change under the third transient power based on the third transient power.

[0099] In some embodiments, the determination module 314 can also be used to increase the power variable if the second cladding strain change does not exceed the cladding strain limit, determine the fourth transient power based on the increased power variable and the initial power at any moment, and determine the fourth cladding strain change under the fourth transient power based on the fourth transient power.

[0100] It should be noted that for other corresponding descriptions of the functional units involved in the fuel rod PCI performance risk assessment device provided in this embodiment, reference can be made to Figure 1 and Figure 2 The corresponding description in will not be repeated here.

[0101] Based on the above Figure 1 and Figure 2 The method shown in the embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned Figure 1 and Figure 2 The fuel rod PCI performance risk assessment method is shown.

[0102] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling an electronic device (which can be a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of the present application.

[0103] Based on the above Figure 1 and Figure 2 The method shown, and Figure 3 and Figure 4 In order to achieve the above-mentioned purpose, the embodiment of the present application also provides an electronic device, which can be a personal computer, a tablet computer, a server, or other network equipment, etc. The device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 1 and Figure 2 The fuel rod PCI performance risk assessment method is shown.

[0104] Optionally, the above-mentioned physical device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.

[0105] Those skilled in the art will appreciate that the above-mentioned physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different arrangements of components.

[0106] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the above-mentioned physical device, and supports the operation of the information processing program and other software and / or programs. The network communication module is used to realize the communication between the components inside the storage medium, and the communication with other hardware and software in the information processing physical device.

[0107] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform, or by hardware.

[0108] The embodiment of the present invention calculates the target limit power of the fuel rod by using the fuel rod limit power surface equation and the fuel rod power and burnup monitored online in real time, and calculates the power margin of the fuel rod based on the target limit power, so as to effectively evaluate the PCI performance risk of the fuel rod, thereby ensuring the safety of the nuclear reactor during operation.

[0109] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0110] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A fuel rod PCI performance risk assessment method, characterized in that: include: Get the current power and current burnup of the fuel rod; Based on the current power and the current burnup, using a fuel rod limit power surface equation, calculating a target limit power corresponding to the current power and the current burnup, wherein the fuel rod limit power surface equation is determined according to the initial power, initial burnup and limit power of the fuel rod at each operating moment; Calculating the power margin of the fuel rod according to the target limit power and the current power; Based on the power margin, a PCI performance risk of the fuel rod is assessed.

2. The method according to claim 1, characterized in that Before obtaining the current power and current burnup of the fuel rod, the method further includes: Obtain the initial power, initial burnup and limit power of the fuel rod at each operating moment; The fuel rod limit power surface equation is fitted based on the initial power, initial burnup and limit power at each operating moment.

3. The method according to claim 2, characterized in that Based on the initial power, initial burnup and limit power at each operating moment, fitting the fuel rod limit power surface equation includes: constructing a two-dimensional polynomial equation for the fuel rod; Based on the two-dimensional polynomial equation, construct a limit power residual sum of squares equation; Taking each polynomial coefficient of the two-dimensional polynomial equation as an unknown variable, using the limit power residual square sum equation to find partial derivatives of the unknown variable, to obtain the matrix equation of the fuel rod; Solving the matrix equation based on the initial power, initial fuel consumption and limit power at each operating moment to obtain values ​​corresponding to each polynomial coefficient; The fuel rod limit power surface equation is determined according to the values ​​corresponding to the polynomial coefficients.

4. The method according to claim 1, characterized in that: The calculating the power margin of the fuel rod according to the target limit power and the current power includes: Subtracting the target limit power from the current power to obtain the power margin of the fuel rod; and / or Based on the power margin, assessing the PCI performance risk of the fuel rod includes: Determining a PCI performance risk level of the fuel rod based on a power range to which the power margin belongs; The PCI performance risk of the fuel rod is evaluated according to the PCI performance risk level of the fuel rod.

5. The method according to any one of claims 2 to 4, characterized in that: Obtain the initial power, initial burnup and limit power of the fuel rod at each operating moment, including: Obtaining the design power history of the fuel rod; generating a virtual power history of the fuel rod according to the designed power history; Calculating the initial power and initial burnup of the fuel rod at each operating moment based on the virtual power history and preset fuel performance analysis software; Determining the design criteria of the fuel rod according to the cladding type of the fuel rod; Determine a first transient power according to the initial power and the power variable at any one of the operating moments, and determine a first cladding strain variation under the first transient power based on the first transient power; Based on the first cladding strain change and the cladding strain limit corresponding to the design criterion, a limit power corresponding to both the initial power and the initial burnup at the arbitrary moment is determined.

6. The method according to claim 5, characterized in that Determining the limit power corresponding to the initial power and the initial burnup at any moment based on the first cladding strain change and the cladding strain limit corresponding to the design criterion, comprising: If the first cladding strain change does not exceed the cladding strain limit, increasing the first transient power to obtain a second transient power, and determining a second cladding strain change under the second transient power based on the second transient power; If the second cladding strain change exceeds the cladding strain limit, the first transient power is determined as the limit power corresponding to the initial power and the initial burnup at any moment.

7. The method according to claim 6, characterized in that The method further comprises: If the first cladding strain change exceeds the cladding strain limit, reducing the power variable, determining a third transient power based on the reduced power variable and the initial power at any one moment, and determining a third cladding strain change under the third transient power based on the third transient power; and / or If the second cladding strain change does not exceed the cladding strain limit, the power variable will be increased, and the fourth transient power will be determined based on the increased power variable and the initial power at any moment, and based on the fourth transient power, the fourth cladding strain change under the fourth transient power will be determined.

8. A fuel rod PCI performance risk assessment device, characterized in that: include: An acquisition unit, used to acquire the current power and current burnup of the fuel rod; a first calculation unit, configured to calculate, based on the current power and the current burnup, a target limit power corresponding to the current power and the current burnup by using a fuel rod limit power surface equation, wherein the fuel rod limit power surface equation is determined according to the initial power, initial burnup and limit power of the fuel rod at each operating moment; A second calculation unit, configured to calculate a power margin of the fuel rod according to the target limit power and the current power; An evaluation unit is used to evaluate the PCI performance risk of the fuel rod based on the power margin.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

10. An electronic device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

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