Rod shuffling method and system for pressurized water reactor

Abstract

Disclosed in the present application are a rod shuffling method and system for a pressurized water reactor. The method comprises: when it is detected that the current burnup point is a first burnup point, on the basis of a plurality of rod-shuffling interpolation relationships of a plurality of control rods, acquiring a plurality of pre-rod-shuffling strategies corresponding to the first burnup point, wherein each control rod corresponds to one rod-shuffling interpolation relationship, each rod-shuffling interpolation relationship comprises a plurality of burnup points and pre-rod-shuffling strategies corresponding to each burnup point, and each pre-rod-shuffling strategy is used for indicating the number of pre-insertion steps of a corresponding control rod; on the basis of the pre-rod-shuffling strategy corresponding to each control rod at the first burnup point, adjusting the number of pre-insertion steps of each control rod; and on the basis of the plurality of adjusted control rods, performing rod shuffling processing. The present application can reduce the disturbance of a pressurized water reactor during rod sequence shuffling of control rods.

Description

Pressurized water reactor rod replacement methods and systems Technical Field

[0001] This application relates to the field of reactor core design technology, and in particular to a method and system for replacing rods in a pressurized water reactor. Background Technology

[0002] During the operation of a pressurized water reactor (PWR), reactivity needs to be compensated as fuel is consumed and power output is increased or decreased. To improve the speed and accuracy of reactivity compensation during this process, PWRs based on a control rod sequence are typically designed. To reduce the burnup shadow effect caused by long-term core insertion of control rods, as well as the burnup effect of the control rods themselves, the control rod sequence needs to be changed.

[0003] Because multiple control rods are located at different positions in the reactor core, the degree of disturbance caused by the movement of the control rods to the reactor core is also different. Therefore, synchronous movement will result in greater disturbance in the pressurized water reactor. Summary of the Invention

[0004] This application aims to propose a method and system for replacing control rods in a pressurized water reactor (PWR), which can reduce PWR disturbances during the sequence exchange of control rods.

[0005] In a first aspect, embodiments of this application provide a method for replacing rods in a pressurized water reactor, the method comprising:

[0006] When the current burnout point is detected as the first burnout point, multiple pre-replacement strategies corresponding to the first burnout point are obtained according to multiple replacement interpolation relationships of multiple control rods. Each control rod corresponds to a replacement interpolation relationship, which includes multiple burnout points and a pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion steps of the corresponding control rod.

[0007] Adjust the pre-insertion steps of each control rod according to the pre-replacement strategy corresponding to the first burnout point;

[0008] The process involves replacing multiple control rods after adjustments.

[0009] In some implementations, before obtaining multiple pre-switch strategies corresponding to the first fuel burnout point based on multiple switch interpolation relationships of multiple control rods when the current fuel burnout point is detected as the first fuel burnout point, the method further includes:

[0010] For any one of the multiple control rods, obtain multiple burn-out points of the control rod throughout the entire lifespan of the pressurized water reactor, and multiple candidate rod replacement strategies corresponding to each burn-out point. The candidate rod replacement strategies are used to indicate the pre-insertion steps of the control rod.

[0011] Calculate the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point;

[0012] For any one of the multiple burnout points of the control rod, the multiple candidate rod replacement strategies corresponding to the burnout point are selected based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, so as to obtain the pre-rod replacement strategy corresponding to the burnout point.

[0013] Based on the pre-replacement strategy corresponding to the burnout point, construct the replacement interpolation relationship for the control rods.

[0014] In some implementations, the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point is calculated, including:

[0015] Obtain at least one evaluation parameter, which includes at least one of the following: nuclear power fluctuation amplitude, temperature fluctuation amplitude, axial power offset fluctuation amplitude, axial power offset rod motion amount, and rod replacement time.

[0016] When at least one evaluation parameter is included, an evaluation parameter is used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point is obtained.

[0017] If at least one evaluation parameter includes multiple evaluation parameters, then each of the multiple evaluation parameters is processed as follows: the evaluation parameters are used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the first result value of each candidate rod replacement strategy is obtained by evaluating it with the evaluation parameters.

[0018] For any candidate rod replacement strategy among multiple candidate rod replacement strategies corresponding to the burnout point, the first result value of the evaluation of each evaluation parameter corresponding to the candidate rod replacement strategy is weighted and summed to obtain the evaluation result value of the candidate rod replacement strategy.

[0019] In some implementations, based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, multiple candidate rod replacement strategies corresponding to the burnout point are selected to obtain the pre-rod replacement strategy corresponding to the burnout point, including:

[0020] The candidate replacement strategy with the largest evaluation result value is selected from multiple candidate replacement strategies corresponding to the burnout point as the pre-replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate replacement strategy.

[0021] In some implementations, the candidate rod-changing strategy includes an initial rod position and a pre-insertion step count;

[0022] Based on the evaluation results of each candidate rod replacement strategy corresponding to the burnout point, multiple candidate rod replacement strategies corresponding to the burnout point are selected to obtain the pre-rod replacement strategy corresponding to the burnout point, including:

[0023] Get the current position of the control rod;

[0024] Based on the current position of the control rod, each candidate rod replacement strategy corresponding to the burnout point is screened to obtain at least one candidate rod replacement strategy. The initial rod position of the at least one candidate rod replacement strategy is the same as the current position of the control rod.

[0025] The candidate rod replacement strategy with the largest evaluation result value is selected from at least one candidate rod replacement strategy as the pre-rod replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate rod replacement strategy.

[0026] In some implementations, the pre-replacement strategy includes an initial rod position, a pre-insertion step count, and an evaluation result value, which is used to characterize the superiority of the pre-replacement strategy.

[0027] When the current burnout point is detected to be the first burnout point, multiple pre-switch strategies corresponding to the first burnout point are obtained based on the multiple switch interpolation relationships of multiple control rods, including:

[0028] If the current burnout point is detected as the first burnout point, and if the first burnout point is not included in the rod replacement interpolation relationship of the first control rod among multiple control rods, and the first burnout point is between the second and third burnout points in the rod replacement interpolation relationship of the first control rod, then the target pre-replacement strategies corresponding to the second and third burnout points are selected from the rod replacement interpolation relationship of the first control rod. Specifically, the evaluation result value of the target pre-replacement strategy corresponding to the second burnout point is the largest among all pre-replacement strategies corresponding to the second burnout point, and the evaluation result value of the target pre-replacement strategy corresponding to the third burnout point is the largest among all pre-replacement strategies corresponding to the third burnout point; or, the initial rod position of the target pre-replacement strategies corresponding to the second and third burnout points is the same as the current rod position of the first control rod.

[0029] Interpolation processing is performed based on the target pre-replacement strategies corresponding to the second and third burnout points to obtain the pre-replacement strategy of the first control rod at the first burnout point.

[0030] In some implementations, the interpolation process includes:

[0031] Two initial rod positions are obtained from the two target rod replacement strategies, and the two initial rod positions are summed and averaged to obtain the initial rod position of the first control rod in the pre-rod replacement strategy at the first burnout point.

[0032] Two pre-insertion steps are obtained from the two target rod replacement strategies, and the two pre-insertion steps are summed and averaged to obtain the pre-insertion steps of the first control rod pre-replacement strategy at the first burnout point.

[0033] Secondly, embodiments of this application also provide a pressurized water reactor rod replacement system, the system comprising:

[0034] The pre-replacement strategy acquisition module is used to acquire multiple pre-replacement strategies corresponding to the first burnout point based on multiple replacement interpolation relationships of multiple control rods when the current burnout point is detected as the first burnout point. Each control rod corresponds to a replacement interpolation relationship, which includes multiple burnout points and the pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion steps of the corresponding control rod.

[0035] The pre-insertion step adjustment module is used to adjust the pre-insertion step of each control rod according to the pre-replacement strategy corresponding to the first burnout point of each control rod.

[0036] The control rod replacement processing module is used to perform rod replacement processing based on multiple adjusted control rods.

[0037] Thirdly, embodiments of this application also provide an electronic device, including at least one control processor and a memory for communicatively connecting to the at least one control processor; the memory stores instructions executable by the at least one control processor, which, when executed by the at least one control processor, enable the at least one control processor to perform a pressurized water reactor rod replacement method as described in the first aspect.

[0038] Fourthly, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform a pressurized water reactor rod replacement method as described in the first aspect.

[0039] In this embodiment, when the current burnout point is detected to be the first burnout point, multiple pre-replacement strategies corresponding to the first burnout point are obtained based on multiple rod replacement interpolation relationships of multiple control rods. Each control rod corresponds to a rod replacement interpolation relationship, which includes multiple burnout points and a pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion step number of the corresponding control rod. Based on the pre-replacement strategy corresponding to each control rod at the first burnout point, the pre-insertion step number of each control rod is adjusted. Rod replacement processing is then performed based on the adjusted multiple control rods. Thus, by first adjusting the pre-insertion step number of each control rod according to the pre-replacement strategy corresponding to each control rod at the first burnout point, and then performing rod replacement processing based on the adjusted multiple control rods, pressurized water reactor disturbance can be reduced when exchanging control rods in sequence. Attached Figure Description

[0040] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0041] Figure 1 is a schematic flowchart of an embodiment of the pressurized water reactor rod replacement method provided in this application;

[0042] Figure 2 is a schematic diagram of the stacking relationship of the T-bar group in the best embodiment of the pressurized water reactor rod replacement method provided in this application;

[0043] Figure 3 is a schematic diagram of the control rod replacement process of the preferred embodiment of the pressurized water reactor rod replacement method provided in this application.

[0044] Figure 4 is a schematic diagram of the pre-insertion rod replacement process of the preferred embodiment of the pressurized water reactor rod replacement method provided in this application.

[0045] Figure 5 is a schematic diagram of the pre-lifting rod replacement process of the preferred embodiment of the pressurized water reactor rod replacement method provided in this application.

[0046] Figure 6 is a schematic diagram of the process for creating the burnup pretreatment interpolation table of the preferred embodiment of the pressurized water reactor rod replacement method provided in this application.

[0047] Figure 7 is a structural schematic diagram of an embodiment of the pressurized water reactor rod replacement system provided in this application;

[0048] Figure 8 is a schematic diagram of an embodiment of the electronic device provided in this application. Detailed Implementation

[0049] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0050] In the description of this application, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0051] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0052] In the description of this application, it should be noted that, unless otherwise explicitly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0053] Because multiple control rods are located at different positions in the reactor core, the degree of disturbance caused by the movement of the control rods to the reactor core is also different. Therefore, synchronous movement will result in greater disturbance in the pressurized water reactor.

[0054] To address the issue of significant disturbances in pressurized water reactors caused by synchronous operation, this application proposes a pressurized water reactor rod replacement method and system.

[0055] Referring to Figure 1, a flowchart illustrating the pressurized water reactor (PWR) rod replacement method provided in this embodiment is shown. This PWR rod replacement method is applied to an electronic device, which may be a server or a mobile terminal, etc. As shown in Figure 1, the PWR rod replacement method may include the following steps:

[0056] Step 110: When the current burnout point is detected as the first burnout point, obtain multiple pre-replacement strategies corresponding to the first burnout point according to multiple replacement interpolation relationships of multiple control rods. Each control rod corresponds to a replacement interpolation relationship. The replacement interpolation relationship includes multiple burnout points and a pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion steps of the corresponding control rod.

[0057] Step 120: Adjust the pre-insertion steps of each control rod according to the pre-replacement strategy corresponding to the first burnout point.

[0058] Step 130: Perform rod replacement processing based on the adjusted multiple control rods.

[0059] In this embodiment, when the current burnout point is detected as the first burnout point, multiple pre-replacement strategies corresponding to the first burnout point are obtained based on multiple rod replacement interpolation relationships of multiple control rods. Each control rod corresponds to a rod replacement interpolation relationship, which includes multiple burnout points and a pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion steps of the corresponding control rod. Based on the pre-replacement strategy corresponding to each control rod at the first burnout point, the pre-insertion steps of each control rod are adjusted. Rod replacement processing is then performed based on the adjusted multiple control rods. Thus, by first adjusting the pre-insertion steps of each control rod according to the pre-replacement strategy corresponding to each control rod at the first burnout point, and then performing rod replacement processing based on the adjusted multiple control rods, pressurized water reactor disturbance can be reduced when exchanging control rods in sequence.

[0060] In step 110 above, when the electronic device detects that the current burnout point is the first burnout point, it obtains multiple pre-replacement strategies corresponding to the first burnout point according to multiple replacement interpolation relationships of multiple control rods. Each control rod corresponds to a replacement interpolation relationship, which includes multiple burnout points and a pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion steps of the corresponding control rod.

[0061] The above-mentioned bar-changing interpolation relationship can be represented in tabular form or in other existing forms used to represent multiple correspondences.

[0062] The above-mentioned tabular representation of the rod-changing interpolation relationship can be either placed in a table for all control rods or in a separate table for each control rod.

[0063] Each control rod mentioned above corresponds to a rod replacement interpolation relationship. The rod replacement interpolation relationship may include multiple burnout points and a pre-rod replacement strategy corresponding to each burnout point. In the rod replacement interpolation relationship corresponding to a control rod, the control rod corresponds to multiple burnout points, and each burnout point corresponds to a pre-rod replacement strategy. A pre-rod replacement strategy includes an initial rod position and a pre-insertion step number corresponding to the initial rod position.

[0064] The aforementioned pre-insertion steps can be either a certain number of downward insertion steps or a certain number of upward lifting steps; this embodiment does not impose specific limitations. A certain number of downward insertion steps constitutes a pre-insertion rod, and a certain number of upward lifting steps constitutes a pre-lifting rod. The pre-insertion rod involves inserting the control rod at a higher position downwards, while the pre-lifting rod involves lifting the control rod at a lower position upwards. The pre-insertion rod and the pre-lifting rod can be obtained using the same method to achieve the pre-replacement rod strategy.

[0065] In step 120 above, the electronic device adjusts the pre-insertion step number of each control rod according to the pre-replacement strategy corresponding to the first burnout point of each control rod.

[0066] The above-mentioned adjustment of the pre-insertion steps of each control rod according to the pre-replacement strategy corresponding to the first burnout point of each control rod can be achieved by obtaining the pre-replacement strategy corresponding to the first burnout point of each control rod in step 110. Since each replacement strategy contains a corresponding pre-insertion step, the pre-insertion step of each control rod is adjusted to the pre-insertion step in the obtained pre-replacement strategy.

[0067] In step 130 above, a rod replacement process is performed based on the adjusted multiple control rods.

[0068] The above-mentioned rod-changing process based on the adjusted multiple control rods can be performed by adjusting the pre-insertion steps of each control rod to the pre-insertion steps in the obtained pre-rod-changing strategy, and then changing the control rods in the conventional rod-changing method.

[0069] In some implementations, before obtaining multiple pre-switch strategies corresponding to the first fuel burnout point based on multiple switch interpolation relationships of multiple control rods when the current fuel burnout point is detected as the first fuel burnout point, the method may further include:

[0070] For any one of the multiple control rods, obtain multiple burn-out points of the control rod throughout the entire lifespan of the pressurized water reactor, and multiple candidate rod replacement strategies corresponding to each burn-out point. The candidate rod replacement strategies are used to indicate the pre-insertion steps of the control rod.

[0071] Calculate the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point;

[0072] For any one of the multiple burnout points of the control rod, the multiple candidate rod replacement strategies corresponding to the burnout point are selected based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, so as to obtain the pre-rod replacement strategy corresponding to the burnout point.

[0073] Based on the pre-replacement strategy corresponding to the burnout point, construct the replacement interpolation relationship for the control rods.

[0074] In this embodiment, by calculating the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point, and then for any burnout point among multiple burnout points of the control rod, the multiple candidate rod replacement strategies corresponding to the burnout point are selected according to the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point. This allows the candidate rod replacement strategy with the best evaluation result value for each burnout point corresponding to each control rod to be selected. The candidate rod replacement strategy with the best evaluation result value is used as the pre-rod replacement strategy for the burnout point corresponding to that control rod, which can better reduce pressurized water reactor disturbance.

[0075] The above-mentioned acquisition of multiple burnout points of control rods throughout the entire lifespan of a pressurized water reactor, and multiple candidate rod replacement strategies corresponding to each burnout point, can be achieved by dividing the entire lifespan of the pressurized water reactor into multiple burnout intervals, selecting burnout points corresponding to each burnout interval, obtaining multiple burnout points; presetting multiple initial rod positions for each burnout point, presetting multiple pre-insertion steps for each initial rod position corresponding to each burnout point, and each pre-insertion step corresponding to a candidate rod replacement strategy, thereby obtaining multiple candidate rod replacement strategies corresponding to each burnout point. The multiple burnout points have the same multiple initial rod positions, but each initial rod position among the multiple initial rod positions is different.

[0076] For example, at three burnout points—1000 MWd / tU, mid-life, and end-life—there are initial rod positions 480, 490, and 500, respectively. Each burnout point has 0, 7, 15, 20, and 30 pre-insertion steps for initial rod position 480, 0, 7, 15, 20, and 30 for initial rod position 490, and 0, 7, 15, 20, and 30 for initial rod position 500. An initial rod position of 480 and a pre-insertion step count of 0 constitute a candidate rod replacement strategy.

[0077] The above calculation of the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point can be based on preset evaluation parameters.

[0078] The above-mentioned construction of the control rod replacement interpolation relationship based on the pre-replacement strategy corresponding to the burnout point can be achieved by mapping the pre-replacement strategy corresponding to each burnout point to a table and constructing the control rod replacement interpolation relationship, or by mapping the pre-replacement strategy corresponding to each burnout point to a relationship graph.

[0079] In some implementations, calculating the evaluation result value for each candidate rod replacement strategy corresponding to each burnout point may include:

[0080] Obtain at least one evaluation parameter, which includes at least one of the following: nuclear power fluctuation amplitude, temperature fluctuation amplitude, axial power offset fluctuation amplitude, axial power offset rod motion amount, and rod replacement time.

[0081] When at least one evaluation parameter is included, an evaluation parameter is used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point is obtained.

[0082] If at least one evaluation parameter includes multiple evaluation parameters, then each of the multiple evaluation parameters is processed as follows: the evaluation parameters are used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the first result value of each candidate rod replacement strategy is obtained by evaluating it with the evaluation parameters.

[0083] For any candidate rod replacement strategy among multiple candidate rod replacement strategies corresponding to the burnout point, the first result value of the evaluation of each evaluation parameter corresponding to the candidate rod replacement strategy is weighted and summed to obtain the evaluation result value of the candidate rod replacement strategy.

[0084] In this embodiment, each candidate rod replacement strategy corresponding to the burnout point is evaluated by at least one evaluation parameter, which can better evaluate the superiority of the candidate rod replacement strategy and lay a good data foundation for the subsequent selection of the pre-replacement strategy.

[0085] The aforementioned nuclear power fluctuation range can be the fluctuation range of the core power measured in the core of a pressurized water reactor. The smaller the nuclear power fluctuation range, the better the candidate rod replacement strategy.

[0086] The temperature fluctuation range mentioned above can be the fluctuation range of the temperature measured in the core of a nuclear pressurized water reactor. The smaller the temperature fluctuation range, the better the candidate rod replacement strategy.

[0087] The smaller the fluctuation range of the aforementioned axial power offset, the better the candidate rod replacement strategy.

[0088] The aforementioned axial power offset rod motion can refer to the up-and-down movement of the control rod during rod changing. The rod motion is used to measure the amplitude of the control rod's up-and-down movement. The smaller the amplitude of the control rod's up-and-down movement, the better the candidate rod changing strategy.

[0089] The aforementioned baton switching time can refer to the control baton switching time. The shorter the control baton switching time, the better the candidate baton switching strategy.

[0090] The aforementioned nuclear power fluctuation amplitude, temperature fluctuation amplitude, axial power offset fluctuation amplitude, axial power offset rod movement amount, and rod replacement time can be measured in a manner that can be obtained by those skilled in the art, and will not be specifically described in this embodiment.

[0091] The above-mentioned weighted summation of the first result values ​​of the evaluation of each evaluation parameter corresponding to the candidate rod replacement strategy to obtain the evaluation result value of the candidate rod replacement strategy can be achieved by first calculating the evaluation value of the evaluation parameter corresponding to each candidate strategy, setting a certain weight for each evaluation parameter, then using the weight corresponding to each evaluation parameter to weight the evaluation value, and then summing the weighted evaluation values ​​corresponding to each evaluation parameter to obtain the evaluation result value of the candidate rod replacement strategy.

[0092] In some implementations, based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, multiple candidate rod replacement strategies corresponding to the burnout point are selected to obtain the pre-rod replacement strategy corresponding to the burnout point, which may include:

[0093] The candidate replacement strategy with the largest evaluation result value is selected from multiple candidate replacement strategies corresponding to the burnout point as the pre-replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate replacement strategy.

[0094] In this embodiment, by selecting the candidate rod replacement strategy with the largest evaluation result value as the pre-rod replacement strategy corresponding to the burnup point, the pressurized water reactor disturbance can be reduced when the control rods are exchanged in sequence.

[0095] The above evaluation result values ​​are used to characterize the superiority of the candidate baton-swapping strategy. A higher score in the evaluation result value indicates that the candidate baton-swapping strategy is better.

[0096] The above-mentioned candidate rod replacement strategy with the largest evaluation result value is selected from multiple candidate rod replacement strategies corresponding to the burnout point as the pre-rod replacement strategy corresponding to the burnout point. If the initial rod position corresponding to the selected pre-rod replacement strategy is different from the current rod position of the control rod, the pre-insertion step number of the control rod will be adjusted after the control rod moves to the initial rod position corresponding to the pre-rod replacement strategy.

[0097] In some implementations, the candidate rod-changing strategy includes an initial rod position and a pre-insertion step count;

[0098] Based on the evaluation results of each candidate rod replacement strategy corresponding to the burnout point, multiple candidate rod replacement strategies corresponding to the burnout point are selected to obtain the pre-rod replacement strategy corresponding to the burnout point, which may include:

[0099] Get the current position of the control rod;

[0100] Based on the current position of the control rod, each candidate rod replacement strategy corresponding to the burnout point is screened to obtain at least one candidate rod replacement strategy. The initial rod position of the at least one candidate rod replacement strategy is the same as the current position of the control rod.

[0101] The candidate rod replacement strategy with the largest evaluation result value is selected from at least one candidate rod replacement strategy as the pre-rod replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate rod replacement strategy.

[0102] In this embodiment, each candidate rod replacement strategy corresponding to the burnout point is screened according to the current rod position of the control rod. Then, the candidate rod replacement strategy with the largest evaluation result value is selected from at least one candidate rod replacement strategy as the pre-rod replacement strategy corresponding to the burnout point. Since the current rod position of the control rod is the same as the initial rod position of the pre-rod replacement strategy, the pre-insertion step of the control rod can be adjusted directly using the pre-rod replacement strategy. The selected pre-rod replacement strategy is the candidate rod replacement strategy with the largest evaluation result value corresponding to the initial rod position that is the same as the current rod position of the control rod. Therefore, the pressurized water reactor disturbance can be reduced when the control rods are exchanged in sequence.

[0103] The above-mentioned filtering of each candidate rod replacement strategy corresponding to the burnout point based on the current position of the control rod to obtain at least one candidate rod replacement strategy can be based on the current position of the control rod to filter each candidate rod replacement strategy corresponding to the burnout point and select at least one candidate rod replacement strategy whose initial position is the same as the current position of the control rod.

[0104] The above method of selecting the candidate rod replacement strategy with the largest evaluation result value from at least one candidate rod replacement strategy as the pre-rod replacement strategy corresponding to the burnout point can be implemented as follows: if there is only one candidate rod replacement strategy selected, then that candidate rod replacement strategy is selected as the pre-rod replacement strategy corresponding to the burnout point; if there is more than one candidate rod replacement strategy selected, then the candidate rod replacement strategy with the largest evaluation result value is selected as the pre-rod replacement strategy corresponding to the burnout point.

[0105] In some implementations, the pre-replacement strategy includes an initial rod position, a pre-insertion step count, and an evaluation result value, which is used to characterize the superiority of the pre-replacement strategy.

[0106] If the current burnout point is detected to be the first burnout point, multiple pre-switch strategies corresponding to the first burnout point are obtained based on the multiple switch interpolation relationships of multiple control rods, which may include:

[0107] If the current burnout point is detected as the first burnout point, and if the first burnout point is not included in the rod replacement interpolation relationship of the first control rod among multiple control rods, and the first burnout point is between the second and third burnout points in the rod replacement interpolation relationship of the first control rod, then the target pre-replacement strategies corresponding to the second and third burnout points are selected from the rod replacement interpolation relationship of the first control rod. Specifically, the evaluation result value of the target pre-replacement strategy corresponding to the second burnout point is the largest among all pre-replacement strategies corresponding to the second burnout point, and the evaluation result value of the target pre-replacement strategy corresponding to the third burnout point is the largest among all pre-replacement strategies corresponding to the third burnout point; or, the initial rod position of the target pre-replacement strategies corresponding to the second and third burnout points is the same as the current rod position of the first control rod.

[0108] Interpolation processing is performed based on the target pre-replacement strategies corresponding to the second and third burnout points to obtain the pre-replacement strategy of the first control rod at the first burnout point.

[0109] In this embodiment, if the first control rod's rod replacement interpolation relationship among multiple control rods does not include the first burnout point, and the first burnout point is between the second and third burnout points in the first control rod's rod replacement interpolation relationship, the pre-rod replacement strategy for the first burnout point can be calculated based on the target pre-rod replacement strategy corresponding to the second and third burnout points. Even if the first burnout point is not in the rod replacement interpolation relationship, a relatively good pre-rod replacement strategy can still be calculated. This calculation process is simple, reduces the amount of calculation, and can reduce pressurized water reactor disturbance when exchanging control rods in sequence.

[0110] The above describes several ways to calculate the pre-replacement strategy for the first control rod when the current burnout point is detected as the first burnout point. Specifically, if the first control rod's replacement interpolation relationship among multiple control rods does not include the first burnout point, and the first burnout point lies between the second and third burnout points in the first control rod's replacement interpolation relationship, then the strategies are as follows:

[0111] The first approach is to select the target pre-replacement strategies corresponding to the second and third fuel consumption points from the rod replacement interpolation relationships of the first control rod. The evaluation result value of the target pre-replacement strategy corresponding to the second fuel consumption point is the largest among all pre-replacement strategies corresponding to the second fuel consumption point, and the evaluation result value of the target pre-replacement strategy corresponding to the third fuel consumption point is the largest among all pre-replacement strategies corresponding to the third fuel consumption point. Then, interpolation processing is performed based on the target pre-replacement strategies corresponding to the second and third fuel consumption points to obtain the pre-replacement strategy of the first control rod at the first fuel consumption point.

[0112] The second approach is to first select the initial positions of the second and third fuel consumption points that are the same as the current position of the first control rod, then obtain the target pre-replacement strategy corresponding to the initial positions of the second and third fuel consumption points, and finally perform interpolation processing based on the target pre-replacement strategies corresponding to the second and third fuel consumption points to obtain the pre-replacement strategy of the first control rod at the first fuel consumption point.

[0113] The above evaluation results are used to characterize the superiority of the pre-replacement strategy. Since the pre-replacement strategy is selected from multiple candidate replacement strategies, the evaluation results can be used to characterize the superiority of the pre-replacement strategy.

[0114] In some implementations, the interpolation process may include:

[0115] Two initial rod positions are obtained from the two target rod replacement strategies, and the two initial rod positions are summed and averaged to obtain the initial rod position of the first control rod in the pre-rod replacement strategy at the first burnout point.

[0116] Two pre-insertion steps are obtained from the two target rod replacement strategies, and the two pre-insertion steps are summed and averaged to obtain the pre-insertion steps of the first control rod pre-replacement strategy at the first burnout point.

[0117] In this embodiment, the initial rod position and pre-insertion steps of the pre-rod replacement strategy at the first burnout point are calculated based on two excellent target rod replacement strategies, so that the calculated pre-rod replacement strategy at the first burnout point is also an excellent strategy, which can reduce pressurized water reactor disturbance when the control rods are exchanged at the first burnout point.

[0118] The above method obtains two initial rod positions from two target rod-changing strategies, and sums and averages these two initial rod positions to obtain the initial rod position of the first control rod's pre-rod-changing strategy at the first burnout point. This can be done regardless of whether the two initial rod positions in the two target rod-changing strategies are the same. If the two initial rod positions obtained from the two target rod-changing strategies are different, the initial rod position of the first control rod's pre-rod-changing strategy at the first burnout point may not be the current rod position of the first control rod. In this case, it is necessary to wait until the first control rod moves to the initial rod position of the pre-rod-changing strategy at the first burnout point before adjusting the pre-insertion step count of the control rod using the pre-rod-changing strategy at the first burnout point. If the two initial rod positions obtained from the two target rod-changing strategies are the same, the pre-insertion step count of the control rod is directly adjusted using the pre-rod-changing strategy at the first burnout point.

[0119] The above method of obtaining two pre-insertion steps from two target rod replacement strategies and summing and averaging the two pre-insertion steps to obtain the pre-insertion steps of the first control rod pre-replacement strategy at the first burnout point can be achieved by obtaining two pre-insertion steps from two target rod replacement strategies, summing the two pre-insertion steps, and then averaging the summed results to obtain the pre-insertion steps of the first control rod pre-replacement strategy at the first burnout point.

[0120] To facilitate understanding by those skilled in the art, a set of preferred embodiments is provided below:

[0121] During the operation of a pressurized water reactor (PWR), reactivity compensation is required due to fuel consumption and power output adjustments. To improve the speed and accuracy of reactivity compensation during this process, PWRs are typically designed based on a rod-changing mechanism. To reduce the burnup shadow effect caused by long-term core insertion of control rods, as well as the burnup effect of the control rods themselves, the control rod sequence needs to be swapped. For example, in a certain design, the T-bar group includes four control rod groups: T1, T2, T3, and T4. The initial control rod sequence is T1-T2-T3-T4, and the sequence after the control rod swap is T4-T3-T2-T1. The rod swapping operation involves switching the rod sequence between the initial sequence and the swapped sequence.

[0122] During normal operation, the T-bar group follows a certain stacking relationship, meaning that the control bars move in a specified order during the lifting process, sometimes with multiple control bars moving simultaneously. Because lifting or insertion limits are set, these bar groups will automatically stop when they reach these positions. An example of a T-bar group stacking setting is shown in Figure 2.

[0123] Typically, during rod replacement, the positions of control rods T1 and T4 are swapped first, followed by swapping the positions of control rods T2 and T3. The insertion and lifting rates of the two sets of rods are kept consistent. The above rod replacement process is shown in Figure 3. Because the two sets of control rods are located in different positions within the reactor core, the degree of disturbance caused by the control rod movements to the core is also different. Synchronous movements can lead to significant disturbances in parameters such as core power, temperature, and axial power offset (AO).

[0124] To reduce this disturbance, this embodiment proposes a new approach: pre-processing the control rod movement. This involves (1) pre-inserting the control rod, allowing the control rod in the high position to be inserted a certain number of steps down; or (2) pre-lifting the control rod, allowing the control rod in the low position to be lifted a certain number of steps up, thus reducing the impact of control rod movement during the rod replacement process. The pre-processed rod replacement process is shown in Figures 4 and 5. The number of pre-processing steps may vary depending on the burnup point throughout the entire lifespan. The pre-processed rod position can be a pre-calculated function varying with burnup, or it can be calculated in real-time using core measurement parameters.

[0125] This embodiment addresses the issue of significant core disturbance caused by synchronous rod replacement. It proposes a control rod action preprocessing interpolation table that varies with burnup, or performs real-time calculations using core measurement parameters to obtain the optimal preprocessing rod replacement scheme (i.e., pre-rod replacement strategy) for the current burnup point. Specifically, it includes the following:

[0126] 1. Create a fuel consumption pretreatment interpolation table.

[0127] Referring to Figure 6, different pre-insertion rod replacement strategies (i.e., candidate rod replacement strategies) are verified at certain intervals throughout the entire cycle life. The fabrication method for a given rod replacement preprocessing strategy is as follows:

[0128] (1) Identify the calibrated burn-out point throughout the entire lifespan.

[0129] (2) For a certain fuel consumption point, verify different pre-insertion rod replacement strategies and evaluate the control results according to the evaluation criteria.

[0130] (3) After all the pre-insertion rod replacement strategies to be verified at a certain fuel consumption point are verified, the optimal pre-processing rod replacement scheme (i.e., pre-replacement rod strategy) is selected as the value of the interpolation table for that fuel consumption point.

[0131] (4) Repeat (2) and (3) to verify all the fuel consumption points to be verified and complete the fuel consumption preprocessing interpolation table.

[0132] 2. Evaluation criteria.

[0133] Evaluation criteria may be selected, but are not limited to the following parameters:

[0134] Nuclear power fluctuation range: The smaller the fluctuation, the better the solution.

[0135] Temperature fluctuation range: The smaller the fluctuation, the better the solution.

[0136] AO fluctuation range: The smaller the fluctuation, the better the solution.

[0137] AO bar motion quantity: The fewer the motions, the better the solution.

[0138] Rod replacement time: The shorter the time, the better the solution.

[0139] In multi-objective optimization, this embodiment uses a weighted summation method:

[0140] If there are n evaluation criteria in total, and the i-th evaluation criterion to be considered is a i The corresponding weight is k i Then the score S of the solution is:

[0141] The higher the S score, the better the solution.

[0142] This embodiment provides a burnup preprocessing interpolation table by performing sensitivity analysis on different pre-insertion steps (i.e., pre-insertion steps) at different burnup points, which provides a reference for the actual use of rod replacement operation in rod-controlled reactor cores and improves the stability of the rod replacement process.

[0143] This embodiment uses a fuel cycle of 1000MW, three burnout points at the middle and end of the service life, and 0, 7, 15, 20, and 30 steps of initial pre-interpolation for rod replacement at each burnout point as examples. A burnout-pre-interpolation step interpolation table is shown in Table 1. This table uses the AO fluctuation amplitude as the evaluation standard and sorts the rod replacement schemes by the number of pre-interpolation steps. For example, to obtain the pre-interpolation steps for the burnout point between the middle and end of the service life, interpolation is performed from the 7 steps corresponding to the middle of the service life and the 0 steps corresponding to MWd / tU at the end of the service life, resulting in 3.5 steps, which is rounded up to 4 steps.

[0144] Table 1. Fuel Consumption Pretreatment Interpolation Table

[0145] Referring to Figure 7, it is a structural schematic diagram of the pressurized water reactor rod replacement system provided in an embodiment of this application. The system may include:

[0146] The pre-replacement rod strategy acquisition module 710 is used to acquire multiple pre-replacement rod strategies corresponding to the first burnout point based on multiple rod replacement interpolation relationships of multiple control rods when the current burnout point is detected as the first burnout point. Each control rod corresponds to a rod replacement interpolation relationship, which includes multiple burnout points and the pre-replacement rod strategy corresponding to each burnout point. The pre-replacement rod strategy is used to indicate the pre-insertion steps of the corresponding control rod.

[0147] The pre-insertion step adjustment module 720 is used to adjust the pre-insertion step of each control rod according to the pre-replacement strategy corresponding to the first burnout point of each control rod.

[0148] The control rod replacement processing module 730 is used for replacing multiple control rods based on adjustments.

[0149] In some implementations, the pre-replacement strategy acquisition module 710 can be specifically used for:

[0150] For any one of the multiple control rods, obtain multiple burn-out points of the control rod throughout the entire lifespan of the pressurized water reactor, and multiple candidate rod replacement strategies corresponding to each burn-out point. The candidate rod replacement strategies are used to indicate the pre-insertion steps of the control rod.

[0151] Calculate the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point;

[0152] For any one of the multiple burnout points of the control rod, the multiple candidate rod replacement strategies corresponding to the burnout point are selected based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, so as to obtain the pre-rod replacement strategy corresponding to the burnout point.

[0153] Based on the pre-replacement strategy corresponding to the burnout point, construct the replacement interpolation relationship for the control rods.

[0154] In some implementations, the pre-replacement strategy acquisition module 710 can be specifically used for:

[0155] Obtain at least one evaluation parameter, which includes at least one of the following: nuclear power fluctuation amplitude, temperature fluctuation amplitude, axial power offset fluctuation amplitude, axial power offset rod motion amount, and rod replacement time.

[0156] When at least one evaluation parameter is included, an evaluation parameter is used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point is obtained.

[0157] If at least one evaluation parameter includes multiple evaluation parameters, then each of the multiple evaluation parameters is processed as follows: the evaluation parameters are used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the first result value of each candidate rod replacement strategy is obtained by evaluating it with the evaluation parameters.

[0158] For any candidate rod replacement strategy among multiple candidate rod replacement strategies corresponding to the burnout point, the first result value of the evaluation of each evaluation parameter corresponding to the candidate rod replacement strategy is weighted and summed to obtain the evaluation result value of the candidate rod replacement strategy.

[0159] In some implementations, the pre-replacement strategy acquisition module 710 can be specifically used for:

[0160] The candidate replacement strategy with the largest evaluation result value is selected from multiple candidate replacement strategies corresponding to the burnout point as the pre-replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate replacement strategy.

[0161] In some implementations, the pre-replacement strategy acquisition module 710 can be specifically used for:

[0162] Get the current position of the control rod;

[0163] Based on the current position of the control rod, each candidate rod replacement strategy corresponding to the burnout point is screened to obtain at least one candidate rod replacement strategy. The initial rod position of the at least one candidate rod replacement strategy is the same as the current position of the control rod.

[0164] The candidate replacement strategy with the largest evaluation result value is selected from at least one alternative replacement strategy as the pre-replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate replacement strategy.

[0165] In some implementations, the pre-replacement strategy acquisition module 710 can be specifically used for:

[0166] If the current burnout point is detected as the first burnout point, and if the first burnout point is not included in the rod replacement interpolation relationship of the first control rod among multiple control rods, and the first burnout point is between the second and third burnout points in the rod replacement interpolation relationship of the first control rod, then the target pre-replacement strategies corresponding to the second and third burnout points are selected from the rod replacement interpolation relationship of the first control rod. Specifically, the evaluation result value of the target pre-replacement strategy corresponding to the second burnout point is the largest among all pre-replacement strategies corresponding to the second burnout point, and the evaluation result value of the target pre-replacement strategy corresponding to the third burnout point is the largest among all pre-replacement strategies corresponding to the third burnout point; or, the initial rod position of the target pre-replacement strategies corresponding to the second and third burnout points is the same as the current rod position of the first control rod.

[0167] Interpolation processing is performed based on the target pre-replacement strategies corresponding to the second and third burnout points to obtain the pre-replacement strategy of the first control rod at the first burnout point.

[0168] In some implementations, the pre-replacement strategy acquisition module 710 can be specifically used for:

[0169] Two initial rod positions are obtained from the two target rod replacement strategies, and the two initial rod positions are summed and averaged to obtain the initial rod position of the first control rod in the pre-rod replacement strategy at the first burnout point.

[0170] Two pre-insertion steps are obtained from the two target rod replacement strategies, and the two pre-insertion steps are summed and averaged to obtain the pre-insertion steps of the first control rod pre-replacement strategy at the first burnout point.

[0171] It should be noted that since the pressurized water reactor rod replacement system in this embodiment is based on the same inventive concept as the pressurized water reactor rod replacement method described above, the corresponding content in the method embodiment is also applicable to this system embodiment, and will not be described in detail here.

[0172] Referring to Figure 8, this application embodiment also provides an electronic device, which may include:

[0173] At least one memory;

[0174] At least one processor;

[0175] At least one program;

[0176] The program is stored in memory, and the processor executes at least one program to implement the pressurized water reactor rod replacement method described above in this application.

[0177] This electronic device can be any smart terminal, including mobile phones, tablets, personal digital assistants (PDAs), and in-vehicle computers.

[0178] The electronic devices according to embodiments of this application will now be described in detail.

[0179] The processor 810 can be implemented using a general-purpose central processing unit (CPU), microprocessor, application specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

[0180] The memory 820 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 820 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 820 and called and executed by the processor 810 using the pressurized water reactor rod replacement method of the embodiments of this application.

[0181] The input / output interface 830 is used to implement information input and output;

[0182] The communication interface 840 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0183] Bus 850 transmits information between various components of the device (e.g., processor 810, memory 820, input / output interface 830, and communication interface 840);

[0184] The processor 810, memory 820, input / output interface 830 and communication interface 840 are connected to each other within the device via bus 850.

[0185] This application embodiment also provides a storage medium, which is a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the above-described pressurized water reactor rod replacement method.

[0186] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0187] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0188] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0189] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0190] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0191] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0192] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0193] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0194] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0195] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0196] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause an electronic device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. The embodiments of this application have been described in detail above with reference to the accompanying drawings, but this application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of this application.

Claims

1. A method for replacing rods in a pressurized water reactor, characterized in that, The method includes: When the current burnout point is detected as the first burnout point, multiple pre-replacement strategies corresponding to the first burnout point are obtained according to multiple replacement interpolation relationships of multiple control rods. Each control rod corresponds to a replacement interpolation relationship, which includes multiple burnout points and a pre-replacement strategy corresponding to each burnout point. The pre-replacement strategy is used to indicate the pre-insertion steps of the corresponding control rod. The number of pre-insertion steps for each control rod is adjusted according to the pre-replacement strategy corresponding to the first burnout point for each control rod. The control rods are adjusted and then replaced.

2. The pressurized water reactor rod replacement method according to claim 1, characterized in that, Before obtaining multiple pre-replacement strategies corresponding to the first fuel burnout point based on multiple rod replacement interpolation relationships of multiple control rods, when the current fuel burnout point is detected as the first fuel burnout point, the method further includes: For any one of the plurality of control rods, obtain multiple burn-out points of the control rod during the entire lifespan of the pressurized water reactor, and multiple candidate rod replacement strategies corresponding to each burn-out point, wherein the candidate rod replacement strategies are used to indicate the pre-insertion steps of the control rod. Calculate the evaluation result value of each candidate rod replacement strategy corresponding to each of the aforementioned burnout points; For any one of the multiple burnout points of the control rod, the multiple candidate rod replacement strategies corresponding to the burnout point are selected according to the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, so as to obtain the pre-rod replacement strategy corresponding to the burnout point. Based on the pre-replacement strategy corresponding to the burnout point, construct the rod replacement interpolation relationship corresponding to the control rod.

3. The pressurized water reactor rod replacement method according to claim 2, characterized in that, The calculation of the evaluation result value of each candidate rod replacement strategy corresponding to each of the aforementioned burnout points includes: Obtain at least one evaluation parameter, which includes at least one of the following: nuclear power fluctuation amplitude, temperature fluctuation amplitude, axial power offset fluctuation amplitude, axial power offset rod movement amount, and rod replacement time. When the at least one evaluation parameter includes an evaluation parameter, the evaluation parameter is used to evaluate each of the candidate rod replacement strategies corresponding to the burnout point, and an evaluation result value of each of the candidate rod replacement strategies corresponding to the burnout point is obtained. If the at least one evaluation parameter includes multiple evaluation parameters, then each of the multiple evaluation parameters is processed as follows: the evaluation parameters are used to evaluate each of the candidate rod replacement strategies corresponding to the burnout point, and a first result value of each candidate rod replacement strategy is obtained by evaluating it with the evaluation parameters. For any one of the multiple candidate rod replacement strategies corresponding to the burnout point, the first result value of the evaluation of each evaluation parameter corresponding to the candidate rod replacement strategy is weighted and summed to obtain the evaluation result value of the candidate rod replacement strategy.

4. The pressurized water reactor rod replacement method according to claim 2, characterized in that, The step of selecting from multiple candidate rod replacement strategies corresponding to the burnout point based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point to obtain the pre-rod replacement strategy corresponding to the burnout point includes: The candidate rod replacement strategy with the largest evaluation result value is selected from multiple candidate rod replacement strategies corresponding to the burnout point as the pre-rod replacement strategy corresponding to the burnout point. The evaluation result value is used to characterize the superiority of the candidate rod replacement strategy.

5. The pressurized water reactor rod replacement method according to claim 2, characterized in that, The candidate bar-changing strategy includes the initial bar position and the number of pre-insertion steps; The step of selecting from multiple candidate rod replacement strategies corresponding to the burnout point based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point to obtain the pre-rod replacement strategy corresponding to the burnout point includes: Obtain the current position of the control rod; Based on the current position of the control rod, each candidate rod replacement strategy corresponding to the burnout point is filtered to obtain at least one candidate rod replacement strategy, wherein the initial rod position of the at least one candidate rod replacement strategy is the same as the current position of the control rod. The candidate rod replacement strategy with the largest evaluation result value is selected from the at least one candidate rod replacement strategy as the pre-rod replacement strategy corresponding to the burnout point, and the evaluation result value is used to characterize the superiority of the candidate rod replacement strategy.

6. The pressurized water reactor rod replacement method according to claim 1, characterized in that, The pre-bar replacement strategy includes the initial bar position, the number of pre-insertion steps, and the evaluation result value, which is used to characterize the superiority of the pre-bar replacement strategy. When the current burnout point is detected to be the first burnout point, multiple pre-battery replacement strategies corresponding to the first burnout point are obtained based on multiple rod replacement interpolation relationships among multiple control rods, including: If the current burnout point is detected to be the first burnout point, and if the first burnout point is not included in the rod replacement interpolation relationship of the first control rod among the plurality of control rods, and the first burnout point is between the second and third burnout points in the rod replacement interpolation relationship of the first control rod, then the target pre-replacement rod strategy corresponding to the second burnout point and the third burnout point are selected from the rod replacement interpolation relationship of the first control rod. The evaluation result value of the target pre-replacement rod strategy corresponding to the second burnout point is the largest among all pre-replacement rod strategies corresponding to the second burnout point, and the evaluation result value of the target pre-replacement rod strategy corresponding to the third burnout point is the largest among all pre-replacement rod strategies corresponding to the third burnout point; or, the initial rod position of the target pre-replacement rod strategy corresponding to the second burnout point and the third burnout point is the same as the current rod position of the first control rod. Interpolation processing is performed based on the target pre-replacement strategies corresponding to the second and third burnout points respectively to obtain the pre-replacement strategy of the first control rod at the first burnout point.

7. The pressurized water reactor rod replacement method according to claim 6, characterized in that, The interpolation process includes: Two initial rod positions are obtained from the two target rod replacement strategies, and the two initial rod positions are summed and averaged to obtain the initial rod position of the pre-rod replacement strategy of the first control rod at the first burnout point. Two pre-insertion steps are obtained from the two target rod replacement strategies, and the two pre-insertion steps are summed and averaged to obtain the pre-insertion steps of the pre-rod replacement strategy of the first control rod at the first burnout point.

8. A pressurized water reactor rod swapping system, characterized in that, The system includes: The pre-replacement rod strategy acquisition module is used to acquire multiple pre-replacement rod strategies corresponding to the first burnout point based on multiple rod replacement interpolation relationships of multiple control rods when the current burnout point is detected as the first burnout point. Each control rod corresponds to a rod replacement interpolation relationship, and the rod replacement interpolation relationship includes multiple burnout points and a pre-replacement rod strategy corresponding to each burnout point. The pre-replacement rod strategy is used to indicate the pre-insertion step number of the corresponding control rod. The pre-insertion step adjustment module is used to adjust the pre-insertion step of each control rod according to the pre-replacement strategy corresponding to each control rod at the first burnout point. A control rod replacement processing module is used to perform rod replacement processing based on the adjusted multiple control rods.

9. The pressurized water reactor rod replacement system according to claim 8, characterized in that, The pre-replacement strategy acquisition module is also used for: For any one of the multiple control rods, obtain multiple burn-out points of the control rod throughout the entire lifespan of the pressurized water reactor, and multiple candidate rod replacement strategies corresponding to each burn-out point. The candidate rod replacement strategies are used to indicate the pre-insertion steps of the control rod. Calculate the evaluation result value of each candidate rod replacement strategy corresponding to each burnout point; For any one of the multiple burnout points of the control rod, the multiple candidate rod replacement strategies corresponding to the burnout point are selected based on the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point, so as to obtain the pre-rod replacement strategy corresponding to the burnout point. Based on the pre-replacement strategy corresponding to the burnout point, construct the replacement interpolation relationship for the control rods.

10. The pressurized water reactor rod replacement system according to claim 8, characterized in that, The pre-replacement strategy acquisition module is also used for: Obtain at least one evaluation parameter, which includes at least one of the following: nuclear power fluctuation amplitude, temperature fluctuation amplitude, axial power offset fluctuation amplitude, axial power offset rod motion amount, and rod replacement time. When at least one evaluation parameter is included, an evaluation parameter is used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the evaluation result value of each candidate rod replacement strategy corresponding to the burnout point is obtained. If at least one evaluation parameter includes multiple evaluation parameters, then each of the multiple evaluation parameters is processed as follows: the evaluation parameters are used to evaluate each candidate rod replacement strategy corresponding to the burnout point, and the first result value of each candidate rod replacement strategy is obtained by evaluating it with the evaluation parameters. For any candidate rod replacement strategy among multiple candidate rod replacement strategies corresponding to the burnout point, the first result value of the evaluation of each evaluation parameter corresponding to the candidate rod replacement strategy is weighted and summed to obtain the evaluation result value of the candidate rod replacement strategy.

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