Rod control method and system for pressurized water reactor

Abstract

This application discloses a pressurized water reactor (PWR) rod replacement control method and system. The method includes: obtaining the differential value relationship of each set of control rods in two sets of control rods. The differential value relationship includes the correspondence between the differential value of a corresponding set of control rods and the number of insertion steps for that set of control rods. The differential value is used to characterize the reactivity change caused by the control rods moving a unit distance from different heights. The two sets of control rods need to exchange the number of insertion steps during the rod replacement process. Based on the differential value relationship of each set of control rods, the average reactivity of the two sets of control rods per unit time is determined. Based on the average reactivity of each set of control rods, the number of movement steps for each set of control rods is determined. Based on the number of movement steps for each set of control rods, the target movement speed of each set of control rods is determined. The method controls each set of control rods to replace rods according to its corresponding target movement speed. This application can reduce the disturbance to the PWR core during the control rod replacement process.

Description

Technical Field

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

[0002] In the operation of a pressurized water reactor, in order to reduce the burnup shadow effect caused by the long-term insertion of control rods into the core and to homogenize the burnup of the control rods themselves, it is necessary to change the control rod sequence.

[0003] Because the two sets of control rods are located in different positions in the reactor core, if the control rods in different positions are simultaneously raised or lowered by the same number of steps, the responsiveness introduced into the pressurized water reactor core will be different, which will lead to a large disturbance in the pressurized water reactor core. Summary of the Invention

[0004] This application aims to propose a pressurized water reactor (PWR) rod replacement control method and system that can reduce the disturbance of the PWR core during the control rod replacement process.

[0005] In a first aspect, embodiments of this application provide a pressurized water reactor rod replacement control method, the method comprising:

[0006] Obtain the differential value relationship of each control rod in the two sets of control rods. The differential value relationship includes the correspondence between the differential value of the corresponding control rod and the number of insertion steps of the control rod. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod. The two sets of control rods need to exchange the number of insertion steps during the rod switching process.

[0007] Based on the differential value relationship of each set of control rods, the average reactivity of the two sets of control rods per unit time is determined;

[0008] The number of steps to move for each group of control rods is determined based on the average responsiveness of each group of control rods.

[0009] The target moving speed of each group of control rods is determined based on the number of steps each group of control rods moves.

[0010] Each control bar is switched according to the movement speed of its corresponding target.

[0011] In some implementations, the average reactivity of the two sets of control rods per unit time is determined based on the differential value relationship of each set of control rods, including:

[0012] Obtain the estimated rod change time and integral value within the estimated rod change time for each group of control rods. The integral value is used to characterize the reactive change caused by moving each group of control rods from one rod position to another within the estimated rod change time.

[0013] Based on the differential value relationship of each group of control rods, determine the average differential value of each group of control rods;

[0014] The smooth movement speed of each control rod group is determined based on the average differential value, integral value, and expected rod replacement time.

[0015] Determine the average speed of smooth movement of the two sets of control rods based on the smooth movement speed of each set of control rods.

[0016] The average responsiveness of the two sets of control rods per unit time is determined based on the steady-moving average velocity.

[0017] In some implementations, the average differential value of each group of control rods is determined based on the differential value relationship of each group of control rods, including:

[0018] Based on the differential value relationship of each group of control rods, determine the target differential value range corresponding to each group of control rods, and the variation range of differential value within the target differential value range is within a preset range;

[0019] Calculate the average differential value of each group of control rods within their respective target differential value range.

[0020] In some implementations, calculating the average differential value of each group of control rods within their respective target differential value range includes:

[0021] For each group of control rods, select multiple differential values ​​within the target differential value range from the differential value relationship;

[0022] The average differential value of each control bar is calculated by averaging multiple differential values ​​to obtain the average differential value of each control bar within its respective target differential value range.

[0023] In some implementations, the number of movement steps for each group of control rods is determined based on the average responsiveness of each group, including:

[0024] Obtain the initial position of each control rod group;

[0025] The control rod replacement process is divided into rod position intervals to obtain at least two rod position intervals ordered according to their order. The at least two rod position intervals include the first rod position interval ordered first and the second rod position interval ordered last. The interval reactivity of the first rod position interval and the second rod position interval is equal.

[0026] Based on the initial position of each group of control rods, determine one of the first position interval and the second position interval corresponding to each group of control rods;

[0027] Based on the interval reactivity and the initial position of each group of control rods, the final position of each group of control rods within the corresponding position interval is obtained.

[0028] Based on the initial and final positions of the control rods, determine the number of steps each control rod will move.

[0029] In some implementations, the target moving speed of each group of control rods is determined based on the number of steps each group of control rods moves, including:

[0030] Based on the interval reactivity and average reactivity, the movement time of each control rod in the corresponding rod position interval is calculated;

[0031] Based on the number of steps and the time taken, the moving speed of each control rod in the corresponding rod position range is calculated.

[0032] The ratio of the moving speed to the steady moving average speed is determined as the normalized speed variation factor for each group of control bars in the corresponding first bar position interval. The steady moving average speed is determined based on the differential value relationship of each group of control bars.

[0033] If the normalized velocity variation factor meets the preset conditions, then the moving speed will be used as the target moving speed for each group of control rods.

[0034] In some implementations, if the normalized velocity variation factor meets a preset condition, the moving speed is used as the target moving speed for each group of control rods, including:

[0035] The absolute value of the difference between the normalized velocity change factor and the pre-acquired first adjustment factor is taken as the first fluctuation value;

[0036] Under the preset condition that the first fluctuation value is less than the pre-acquired second adjustment factor, the moving speed is used as the target moving speed for each group of control rods.

[0037] Secondly, embodiments of this application also provide a pressurized water reactor rod replacement control system, the system comprising:

[0038] The data acquisition module is used to acquire the differential value relationship of each control rod in the two sets of control rods. The differential value relationship includes the correspondence between the differential value of the corresponding set of control rods and the number of insertion steps of the control rods in that set. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod. The two sets of control rods need to exchange the number of insertion steps during the rod switching process.

[0039] The reactivity determination module is used to determine the average reactivity of the two sets of control rods per unit time based on the differential value relationship of each set of control rods.

[0040] The movement step determination module is used to determine the movement step of each group of control rods based on the average responsiveness of each group of control rods.

[0041] The movement speed determination module is used to determine the target movement speed of each group of control sticks based on the number of steps each group of control sticks moves.

[0042] The rod-changing control module is used to control each group of control rods to change rods according to their respective target movement speed.

[0043] 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 control method as described in the first aspect.

[0044] 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 control method as described in the first aspect.

[0045] In this embodiment, the differential value relationship of each control rod in two sets of control rods is obtained. This differential value relationship includes the correspondence between the differential value of a corresponding control rod set and the number of insertion steps for that set of control rods. The differential value characterizes the change in reactivity caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod, and the two sets of control rods need to exchange insertion steps during the rod replacement process. Based on the differential value relationship of each set of control rods, the average reactivity of the two sets of control rods per unit time is determined. Based on the average reactivity of each set of control rods, the number of movement steps for each set of control rods is determined. Based on the number of movement steps for each set of control rods, the target movement speed of each set of control rods is determined. Each set of control rods is controlled to replace itself according to its corresponding target movement speed. Thus, since the target movement speed of each set of control rods is determined based on the average reactivity of each set of control rods, moving each set of control rods according to the target movement speed can minimize the reactivity generated when the two sets of control rods are simultaneously raised or lowered, thereby reducing disturbance to the pressurized water reactor core during the control rod replacement process. Attached Figure Description

[0046] 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:

[0047] Figure 1 This is a schematic flowchart of an embodiment of the pressurized water reactor rod replacement control method provided in this application;

[0048] Figure 2 This is a schematic diagram of the T-bar stacking relationship of the preferred embodiment of the pressurized water reactor rod replacement control method provided in this application;

[0049] Figure 3 This is a schematic diagram of the control rod replacement method for the pressurized water reactor provided in this application, representing the preferred embodiment of the control method.

[0050] Figure 4 This is a schematic diagram of the differential value relationship of the preferred embodiment of the pressurized water reactor rod replacement control method provided in this application;

[0051] Figure 5 This is a schematic diagram of the differential value selection during the steady-state phase of the preferred embodiment of the pressurized water reactor rod replacement control method provided in this application.

[0052] Figure 6 This is a schematic diagram of the control rod velocity variation of the preferred embodiment of the pressurized water reactor rod replacement control method provided in this application;

[0053] Figure 7 This is a flowchart illustrating the preferred embodiment of the pressurized water reactor rod replacement control method provided in this application;

[0054] Figure 8 This is a schematic diagram of an embodiment of the pressurized water reactor rod replacement control system provided in this application;

[0055] Figure 9 This is a schematic diagram of the structure of an embodiment of the electronic device provided in this application. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In the operation of a pressurized water reactor, in order to reduce the burnup shadow effect caused by the long-term insertion of control rods into the core and to homogenize the burnup of the control rods themselves, it is necessary to change the control rod sequence.

[0061] Because the two sets of control rods are located in different positions in the reactor core, if the control rods in different positions are simultaneously raised or lowered by the same number of steps, the responsiveness introduced into the pressurized water reactor core will be different, which will lead to a large disturbance in the pressurized water reactor core.

[0062] To address the aforementioned problem of significant disturbances in the pressurized water reactor core, this application proposes a pressurized water reactor rod replacement control method and system.

[0063] Reference Figure 1 This application provides a schematic flowchart of a pressurized water reactor (PWR) rod replacement control method. This PWR rod replacement control method is applied to electronic equipment, which may be a server or a mobile terminal, etc. Figure 1 As shown, the pressurized water reactor rod replacement control method may include the following steps:

[0064] Step 110: Obtain the differential value relationship of each control rod in the two sets of control rods. The differential value relationship includes the correspondence between the differential value of the corresponding control rod and the number of insertion steps of the control rod. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod. The two sets of control rods need to exchange the number of insertion steps during the rod switching process.

[0065] Step 120: Based on the differential value relationship of each group of control rods, determine the average reactivity of the two groups of control rods per unit time.

[0066] Step 130: Determine the number of steps to move for each group of control rods based on the average responsiveness of each group of control rods.

[0067] Step 140: Determine the target moving speed of each group of control rods based on the number of steps each group of control rods moves.

[0068] Step 150: Control each group of control rods to switch rods according to their respective target movement speed.

[0069] In this embodiment, the differential value relationship of each control rod in the two sets of control rods is obtained. This differential value relationship includes the correspondence between the differential value of a corresponding control rod set and the number of insertion steps for that set of control rods. The differential value characterizes the change in reactivity caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod, and the two sets of control rods need to exchange insertion steps during the rod replacement process. Based on the differential value relationship of each set of control rods, the average reactivity of the two sets of control rods per unit time is determined. Based on the average reactivity of each set of control rods, the number of movement steps for each set of control rods is determined. Based on the number of movement steps for each set of control rods, the target movement speed of each set of control rods is determined. Each set of control rods is then controlled to replace itself according to its corresponding target movement speed. Thus, since the target movement speed of each set of control rods is determined based on the average reactivity of each set of control rods, moving each set of control rods according to the target movement speed can minimize the reactivity generated when the two sets of control rods are simultaneously raised or lowered, thereby reducing disturbance to the pressurized water reactor core during the control rod replacement process.

[0070] In step 110 above, the differential value relationship of each control rod in the two sets of control rods is obtained. The differential value relationship includes the correspondence between the differential value of the corresponding set of control rods and the number of insertion steps of the control rods in that set. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod. The two sets of control rods need to exchange the number of insertion steps during the rod changing process.

[0071] The reactivity mentioned above can be a physical quantity reflecting the state of a nuclear reactor, and can be used to characterize the degree to which the reactor deviates from the critical state, that is, the relative offset of the effective increment factor k from the critical value 1.

[0072] The above-mentioned relationship of the differential value of each control rod in the two sets of control rods can be obtained from the differential value of each control rod as the number of insertion steps of that control rod changes.

[0073] The two sets of control rods mentioned above need to exchange the number of insertion steps during the rod switching process. This can be achieved by swapping the initial number of insertion steps for the two sets of control rods. For example, if the first set of control rods initially inserts 120 steps and the second set inserts 225 steps, then after the swap, the first set of control rods will insert 225 steps and the second set will insert 120 steps.

[0074] In step 120 above, the average reactivity of the two sets of control rods per unit time is determined based on the differential value relationship of each set of control rods.

[0075] The above method of determining the average reactivity of two sets of control rods per unit time based on the differential value relationship of each set of control rods can be achieved by first calculating the average steady-state movement speed of the two sets of control rods (i.e., the average of the steady-state movement speeds of the two sets of control rods) based on the differential value relationship of each set of control rods, and then calculating the average reactivity of the two sets of control rods per unit time based on the average steady-state movement speed.

[0076] The aforementioned smooth moving speed can be calculated based on the differential value in the differential value relationship of each group of control rods.

[0077] The average responsiveness mentioned above can be the responsiveness generated when the two sets of control rods move to a certain position within a unit of time. For example, within the same movement time, the first set of control rods moves from an insertion step of 120 to an insertion step of 150, a movement of 30 steps, generating a positive responsiveness of 20. The second set of control rods moves from an insertion step of 225 to an insertion step of 175, a movement of 50 steps, generating a negative responsiveness of 20. Therefore, the average responsiveness of the two sets of control rods is 20 divided by the movement time.

[0078] In step 130 above, the number of steps to move for each group of control rods is determined based on the average responsiveness of each group of control rods.

[0079] The above method of determining the number of steps for each control rod group based on the average responsiveness of each group can be achieved by determining the total responsiveness of each control rod group after moving a certain number of steps based on the average responsiveness of each group of control rods. In order to control the total responsiveness of the two groups of control rods to cancel each other out, the number of steps for moving the two groups of control rods is controlled under the premise of ensuring that the total responsiveness of the two groups of control rods can cancel each other out as much as possible.

[0080] For example, if the first set of control rods moves from insertion step 120 to insertion step 225, it produces a positive reactivity, while the second set of control rods moves from insertion step 225 to insertion step 120, it produces a negative reactivity. Therefore, during the switching process between the two sets of control rods, efforts should be made to ensure that the positive and negative reactivity generated by the two sets of control rods cancel each other out.

[0081] In step 140 above, the target moving speed of each group of control rods is determined based on the number of steps each group of control rods moves.

[0082] The above method of determining the target moving speed of each group of control rods based on the number of steps each group of control rods moves can be achieved by calculating the target moving speed of each group of control rods based on the number of steps and the moving time of each group of control rods.

[0083] For example, within the same movement time, the first set of control rods moves from insertion step number 120 to insertion step number 150, a distance of 30 steps, producing a positive reactivity of 20. The second set of control rods moves from insertion step number 225 to insertion step number 175, a distance of 50 steps, producing a negative reactivity of 20. Therefore, the target movement speed of the first set of control rods moving from insertion step number 120 to insertion step number 150 is 30 divided by the movement time, yielding the first target movement speed. Similarly, the target movement speed of the second set of control rods moving from insertion step number 225 to insertion step number 175 is 50 divided by the movement time, yielding the second target movement speed.

[0084] In step 150 above, each group of control rods is controlled to switch rods according to the corresponding target movement speed.

[0085] The above-mentioned control rods switch according to the target movement speed of each group. This may be because the target movement speed of each group of control rods is different, so each group of control rods switches according to the target movement speed of its corresponding target.

[0086] For example, within the same movement time, the first group of control sticks moves from an insertion step of 120 to a position interval of 150, using the first target movement speed. The second group of control sticks moves from an insertion step of 225 to a position interval of 175, using the second target movement speed. From insertion step 150 to insertion step 175, both groups of control sticks move at the same speed; that is, the first group moves from insertion step 150 to insertion step 175, and the second group moves from insertion step 175 to insertion step 150. When the first control stick moves from insertion step 175 to insertion step 225, it uses the second target movement speed. When the first group moves from insertion step 150 to insertion step 120, it uses the first target movement speed. This completes the switch between the first and second groups of control sticks.

[0087] For example, within the same movement time, the first set of control rods moves from insertion step number 120 to insertion step number 160, a distance of 40 steps, producing a positive reactivity of 25. The second set of control rods moves from insertion step number 225 to insertion step number 160, a distance of 65 steps, producing a negative reactivity of 25. Therefore, the target movement speed of the first set of control rods moving from insertion step number 120 to insertion step number 160 is 40 divided by the movement time, yielding the first target movement speed. Similarly, the target movement speed of the second set of control rods moving from insertion step number 225 to insertion step number 160 is 65 divided by the movement time, yielding the second target movement speed.

[0088] Then, the first set of control sticks moves from an insertion step of 120 to a position interval of 160, using the first target movement speed. The second set of control sticks moves from an insertion step of 225 to a position interval of 160, using the second target movement speed. The first set of control sticks moves from an insertion step of 160 to a position interval of 225, using the second target movement speed. The second set of control sticks moves from an insertion step of 160 to a position interval of 120, using the first target movement speed. This completes the switch between the first and second sets of control sticks.

[0089] In some implementations, determining the average reactivity of the two sets of control rods per unit time based on the differential value relationship of each set of control rods may include:

[0090] Obtain the estimated rod change time and integral value within the estimated rod change time for each group of control rods. The integral value is used to characterize the reactive change caused by moving each group of control rods from one rod position to another within the estimated rod change time.

[0091] Based on the differential value relationship of each group of control rods, determine the average differential value of each group of control rods;

[0092] The smooth movement speed of each control rod group is determined based on the average differential value, integral value, and expected rod replacement time.

[0093] Determine the average speed of smooth movement of the two sets of control rods based on the smooth movement speed of each set of control rods.

[0094] The average responsiveness of the two sets of control rods per unit time is determined based on the steady-moving average velocity.

[0095] In this embodiment, the smooth moving speed of each set of control rods is determined by using the average differential value, integral value, and estimated rod changing time. Then, based on the smooth moving speed of each set of control rods, the average smooth moving speed of the two sets of control rods is determined. Finally, based on the average smooth moving speed, the average reactivity of the two sets of control rods per unit time is determined. Since the calculated average reactivity of the two sets of control rods per unit time is equal, the positive and negative reactivity generated by the two sets of control rods can be canceled out as much as possible. Furthermore, the determined smooth moving speed of each set of control rods can ensure that the rod changing speed remains stable as much as possible, thereby reducing the disturbance caused by rod changing.

[0096] The above method, based on the differential value relationship of each group of control rods, determines the average differential value of each group of control rods. This can be achieved by obtaining the differential value of each control rod for different insertion steps from the differential value relationship, selecting a certain range of insertion steps, obtaining multiple differential values ​​for insertion steps within that range, and averaging these multiple differential values ​​to obtain the average differential value. Alternatively, it can be achieved by obtaining the differential value of each control rod for different insertion steps from the differential value relationship of each group of control rods, selecting multiple differential values ​​within a certain range from the differential values ​​for different insertion steps, and averaging these multiple differential values ​​to obtain the average differential value.

[0097] The above method of determining the average speed of the two sets of control rods based on the smooth movement speed of each set of control rods can be achieved by averaging the smooth movement speeds of the two sets of control rods.

[0098] The above method of determining the average responsiveness of the two sets of control rods per unit time based on the steady-state moving average velocity can be achieved by calculating the reciprocal of the steady-state moving average velocity to obtain the average responsiveness of the two sets of control rods per unit time.

[0099] In some implementations, determining the average differential value of each group of control rods based on the differential value relationship of each group of control rods may include:

[0100] Based on the differential value relationship of each group of control rods, determine the target differential value range corresponding to each group of control rods, and the variation range of differential value within the target differential value range is within a preset range;

[0101] Calculate the average differential value of each group of control rods within their respective target differential value range.

[0102] In this embodiment, the target differential value range for each group of control rods is determined based on the differential value relationship of each group of control rods, and the variation range of differential value within the target differential value range is within a preset range. Then, the average differential value of each group of control rods within its respective target differential value range is calculated. In this way, by calculating the average differential value through relatively stable differential values, a good data foundation is laid for the subsequent calculation of the target movement speed, thereby reducing the disturbance caused by rod switching.

[0103] The variation range of the differential value within the aforementioned target differential value range is within a preset range. This preset range can be set manually based on historical experience to control the variation range of the differential value within the target differential value range.

[0104] The above calculation of the average differential value of each group of control rods within their respective target differential value range can be achieved by obtaining multiple differential values ​​within the target differential value range, and then calculating the average differential value of each group of control rods within their respective target differential value range based on these multiple differential values.

[0105] In some implementations, calculating the average differential value of each group of control rods within their respective target differential value range may include:

[0106] For each group of control rods, select multiple differential values ​​within the target differential value range from the differential value relationship;

[0107] The average differential value of each control bar is calculated by averaging multiple differential values ​​to obtain the average differential value of each control bar within its respective target differential value range.

[0108] In this embodiment, by averaging multiple differential values, the average differential value of each group of control rods within their respective target differential value range is obtained, which can lay a good data foundation for the subsequent calculation of the target movement speed, thereby reducing the disturbance caused by rod switching.

[0109] For each group of control rods, multiple differential values ​​within the target differential value range are selected from the differential value relationship. Since the differential value relationship corresponding to each group of control rods is different, multiple differential values ​​within the target differential value range can be selected from the differential value relationship of each group of control rods.

[0110] In some implementations, determining the number of movement steps for each group of control rods based on the average responsiveness of each group may include:

[0111] Obtain the initial position of each control rod group;

[0112] The control rod replacement process is divided into rod position intervals to obtain at least two rod position intervals ordered according to their order. The at least two rod position intervals include the first rod position interval ordered first and the second rod position interval ordered last. The interval reactivity of the first rod position interval and the second rod position interval is equal.

[0113] Based on the initial position of each group of control rods, determine one of the first position interval and the second position interval corresponding to each group of control rods;

[0114] Based on the interval reactivity and the initial position of each group of control rods, the final position of each group of control rods within the corresponding position interval is obtained.

[0115] Based on the initial and final positions of the control rods, determine the number of steps each control rod will move.

[0116] In this embodiment, the rod position intervals during the control rod switching process are divided to obtain at least two rod position intervals ordered sequentially. Then, based on the initial rod position of each group of control rods, one of the first and second rod position intervals corresponding to each group of control rods is determined. Next, based on the interval reactivity and the initial rod position of each group of control rods, the final rod position of each group of control rods within its corresponding rod position interval is obtained. Finally, based on the initial and final rod positions, the number of movement steps for each group of control rods is determined. Thus, by ensuring that the interval reactivity of the first and second rod position intervals is equal, and by ultimately determining the number of movement steps for each group of control rods, the reactivity generated during the rod switching process can be largely offset, thereby reducing disturbances during the switching process.

[0117] The above-mentioned division of the control rod replacement process into rod position intervals yields at least two rod position intervals ordered according to their sequence. This can be achieved by dividing the entire control rod replacement process into two intervals or three intervals, and then sorting the rod position intervals according to the order of the number of insertion steps.

[0118] The above method, based on the initial position of each control rod group, determines either the first or second position interval for each control rod group. This can be achieved by dividing the entire control rod changing process into two intervals, designating the first interval as the first position interval and the second interval as the second position interval. Each control rod group moving to its corresponding interval will then obtain either the first or second position interval. Alternatively, when the entire control rod changing process is divided into three intervals, the first interval is designated as the first position interval, and the last interval as the second position interval.

[0119] For example, the entire control bar switching process from 120 to 225 insertion steps can be divided into two intervals: 120 to 160 insertion steps (first interval) and 160 to 225 insertion steps (second interval). When the first set of control bars moves from insertion step 120 to 160, it is in the first interval; when it moves from 160 to 225, it is in the second interval. Similarly, when the second set of control bars moves from 225 to 160, it is in the second interval; and when it moves from 160 to 120, it is in the first interval.

[0120] The aforementioned interval reactivity can be the total reactivity corresponding to each interval in the entire control rod replacement process.

[0121] Based on the interval reactivity and the initial position of each group of control rods, the final position of each group of control rods within the corresponding position interval is obtained. Since different insertion steps correspond to different differential values, and differential values ​​correspond to reactivity, it is possible to obtain the interval reactivity corresponding to the final position (i.e., the last insertion step) based on the initial position (i.e., the initial insertion step). Thus, the final position of each group of control rods within the corresponding position interval is obtained.

[0122] For example, if the interval reactivity is 20, and the initial position of a set of control rods is 120 insertion steps, the reactivity generated when moving to 125 insertion steps is 10, and the reactivity corresponding to moving to 130 insertion steps is 20, then the set of control rods will continue to move from 120 insertion steps to 130 insertion steps, and the final insertion step is determined to be 130.

[0123] The above method of determining the number of steps for each group of control rods based on the initial and final rod positions can be achieved by subtracting the initial rod position from the final rod position.

[0124] In some implementations, determining the target moving speed of each group of control rods based on the number of steps each group of control rods has moved may include:

[0125] Based on the interval reactivity and average reactivity, the movement time of each control rod in the corresponding rod position interval is calculated;

[0126] Based on the number of steps and the time taken, the moving speed of each control rod in the corresponding rod position range is calculated.

[0127] The ratio of the moving speed to the steady moving average speed is determined as the normalized speed variation factor for each group of control bars in the corresponding first bar position interval. The steady moving average speed is determined based on the differential value relationship of each group of control bars.

[0128] If the normalized velocity variation factor meets the preset conditions, then the moving speed will be used as the target moving speed for each group of control rods.

[0129] In this embodiment, firstly, the movement time of each control rod within its corresponding position interval is calculated based on interval reactivity and average reactivity. Then, the movement speed of each control rod within its corresponding position interval is calculated based on the number of movement steps and the movement time. Next, the ratio of the movement speed to the steady-state moving average speed is determined as the normalized velocity variation factor for each control rod within its corresponding first position interval. The steady-state moving average speed is determined based on the differential value relationship of each control rod. Finally, if the normalized velocity variation factor meets a preset condition, the movement speed is taken as the target movement speed for each control rod. Thus, since the interval reactivity of the position intervals corresponding to each control rod is equal, and since the reactivity of the two control rods during the rod-changing process is positive and negative, the interval reactivity of the two control rods during the rod-changing process can be minimized by ensuring that they cancel each other out, thereby reducing disturbances during the rod-changing process.

[0130] The above calculation of the movement time of each control rod within the corresponding rod position interval based on interval reactivity and average reactivity can be attributed to the fact that interval reactivity is the total reactivity, while average reactivity is the reactivity per unit time. Therefore, dividing interval reactivity by average reactivity allows us to calculate the movement time of each control rod within the corresponding rod position interval.

[0131] The above calculation of the movement speed of each control rod within the corresponding rod position interval based on the number of movement steps and the movement time can be achieved by dividing the number of movement steps by the movement time.

[0132] In some implementations, if the normalized velocity variation factor meets a preset condition, the moving speed is used as the target moving speed for each group of control rods, which may include:

[0133] The absolute value of the difference between the normalized velocity change factor and the pre-acquired first adjustment factor is taken as the first fluctuation value;

[0134] Under the preset condition that the first fluctuation value is less than the pre-acquired second adjustment factor, the moving speed is used as the target moving speed for each group of control rods.

[0135] In this embodiment, the absolute value of the difference between the normalized velocity variation factor and the pre-acquired first adjustment factor is used as the first fluctuation value. Under the preset condition that the first fluctuation value is less than the pre-acquired second adjustment factor, the moving speed is used as the target moving speed for each group of control rods. Thus, by controlling the normalized velocity variation factor within a suitable range according to the adjustment factor, the moving speed of each group of control rods is controlled within a suitable range. This ensures that the reactivity of the two groups of control rods can cancel each other out, and also ensures that the rod-changing speed remains stable, thereby minimizing the disturbance generated during the rod-changing process.

[0136] The aforementioned first adjustment factor can be a threshold value of the normalized rate change factor that is set manually based on experience.

[0137] The aforementioned second adjustment factor can be a fluctuation threshold of the first fluctuation value, set manually based on experience.

[0138] To facilitate understanding by those skilled in the art, a set of preferred embodiments is provided below:

[0139] 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 pattern. To reduce the burnup shadowing effect caused by long-term core insertion of control rods and to homogenize the burnup 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 control rod replacement sequence is T4-T3-T2-T1. The rod replacement operation involves switching the rod sequence between the initial sequence and the replacement sequence.

[0140] During normal operation, the T-bar group maintains a certain stacking relationship, meaning that the control rods move in a specified order during the lifting process, sometimes with multiple control rod groups moving simultaneously. Due to the set lifting or insertion limits, these rod groups will automatically stop when they reach these positions. An example of a T-bar group stacking setting is shown below. Figure 2 .

[0141] Typically, when changing control rods, the positions of control rods T1 and T4 are swapped first, then the positions of control rods T2 and T3 are swapped. The insertion and lifting speeds of both sets of rods are kept consistent. The above rod changing process is as follows: Figure 3 As shown. Because the two sets of control rods are located in different positions in the reactor core, the degree of disturbance caused by the control rod movements to the reactor core is also different. Synchronous movements will result in large disturbances to parameters such as core power, temperature, and axial power offset (AO).

[0142] One key reason for this disturbance is the varying differential reactivity of control rods at different positions. Therefore, if control rods at different positions are simultaneously raised and lowered the same number of times, the resulting reactivity to the reactor core differs, causing disturbances. To address this, this embodiment proposes a rod replacement strategy based on control rod reactivity: first, the differential value of a single rod group is calculated; during the replacement process, the rule for control rod movement is that the reactivity introduced by raising the rods and the negative reactivity introduced by lowering them remain consistent.

[0143] Because the differential value of the control rod differs at different positions, the speed of the control rod constantly changes during the rod switching process. To reduce control rod movements and facilitate control, this embodiment also employs a method based on a normalized velocity variation factor to filter frequent control rod movements, thereby obtaining a relatively stable control rod movement rate.

[0144] This embodiment aims to address the core disturbance caused by synchronous rod replacement by proposing an average velocity rod replacement strategy based on the differential value of a single rod. Specifically, it includes the following steps:

[0145] 1. Calculate the differential value of a single control rod.

[0146] Using core calculation software, the differential value of a single control rod group can be obtained. This differential value characterizes the change in reactivity caused by the control rod moving a unit distance from different heights. The relationship between the differential value and the control rod insertion step (i.e., the number of insertion steps) is as follows: Figure 4 As shown.

[0147] 2. Based on the distribution of the differential value of each control rod with respect to the control rod position (i.e., the control rod insertion step), identify the phase where the differential value is relatively stable, and use this as a benchmark to determine the reactive change brought about by the control rod action within a certain period of time.

[0148] Let the steady-state differential value (i.e., the average differential value) of a certain rod group be k. i In this embodiment, the differential value of a single bar is calculated for T1 and T4 respectively, yielding their respective stable bar differential values ​​k1 and k4. The stable bar differential value k... i Select as Figure 5 As shown.

[0149] 3. Based on the differential value k of the steady bar i (pcm / step), with the estimated rod replacement time t(s), and the total integral value of the control rods to be digested for the rod replacement s. i (pcm) can be used to obtain the smooth movement speed (i.e., smooth traverse speed) v of each control rod. i .

[0150]

[0151] Among them, v i The unit is step / s.

[0152] For the two sets of control rods T1 and T4, the equivalent average velocity of smooth control rod movement (i.e., the average velocity of smooth movement) v is:

[0153]

[0154] The average reactivity introduced per unit time (i.e., average reactivity) for:

[0155]

[0156] Furthermore, for a specific position of a control rod, the following is introduced: The reactivity of , from b1 to b2, is as follows:

[0157]

[0158] For the two sets of control rods, in order for the introduced reactivity to cancel each other out, i.e. The starting point (initial bar position) b1 is determined as much as possible, and the ending point (final bar position) b2, which varies according to the total reactivity change, is also determined. If the fluctuation range is too large, the normalized rate of change factor is adjusted by appropriately adjusting t0, which means adjusting b2.

[0159] Among them, b1 and b2 are introduced The reactivity corresponds to the rod position (from b1 to b2), t0 is the time required to change from b1 to b2 (i.e., the movement time), v 0b This represents the movement speed of the control rod at the current position b. Therefore, the movement speed v of the current specific rod position can be determined. 0b The difference expression is:

[0160]

[0161] Let the normalization rate change factor be η, then:

[0162]

[0163] The magnitude of the speed change during the current rod replacement process can be determined using η. η should ideally fluctuate within a small range around a defined value (i.e., the first adjustment factor) η0.

[0164] |η-η0|<ε

[0165] Here, ε represents the second adjustment factor, which is a small positive number.

[0166] To address the different rod position intervals throughout the rod changing process, the normalized velocity variation factor is discussed. For situations with drastic and frequent velocity changes, an appropriate rod position interval is selected for normalized velocity variation factor analysis to ensure that the control rod velocity remains relatively constant during the rod changing process.

[0167] Specifically, for the entire control rod switching process from b1 to b2, taking b1 as the low rod position and T1 as the starting rod position and T4 as the ending rod position, and b2 as the high rod position and T4 as the starting rod position and T1 as the ending rod position, and dividing the rod position interval of the switching process into two parts, the following examples illustrate the process: In the first half, because T4 is in the high rod position, the differential value of the control rod is relatively small, so more steps are needed to match the responsiveness introduced by the T1 action. In the second half, because T1 moves to the high rod position, the differential value of the control rod decreases, so T4 needs to slow down to match the responsiveness introduced by the T1 action. The speed changes of T1 and T4 are illustrated in the diagram below. Figure 6 As shown.

[0168] 4. Evaluation criteria.

[0169] Evaluation criteria may be selected, but are not limited to the following parameters:

[0170] Nuclear power fluctuation range: The 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 design.

[0171] Temperature fluctuation range: Temperature fluctuation range can be the fluctuation range of the temperature measured in the core of a pressurized water reactor. The smaller the temperature fluctuation range, the better the design.

[0172] AO fluctuation amplitude: This refers to the fluctuation amplitude of axial power offset. The smaller the fluctuation amplitude of axial power offset, the better the solution.

[0173] AO rod motion: This refers to the rod motion resulting from axial power offset. The rod motion can be measured by the up-and-down movement of the control rod during rod changing. A smaller up-and-down motion of the control rod indicates a better design.

[0174] Control rod replacement time: Control rod replacement time refers to the time required to replace a control rod. The shorter the control rod replacement time, the better the solution.

[0175] Normalized rate of change factor: The closer the normalized rate of change factor is to η0, the better the scheme.

[0176] 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.

[0177] In multi-objective optimization, this embodiment uses a weighted summation method:

[0178] If there are n evaluation criteria in total, and the i-th evaluation criterion to be considered is a i The corresponding weight is m i Then the score S of the solution is:

[0179]

[0180] The higher the score, the better the solution.

[0181] Reference Figure 7 This embodiment discusses the normalized velocity variation factor for different rod position intervals during the control rod replacement process. This ensures that the reactive effects caused by the insertion and lifting during the replacement process cancel each other out, while maintaining a stable replacement speed as much as possible. This ensures that the impact on the core's operating state (i.e., disturbance) during the replacement process is minimal.

[0182] Reference Figure 8 This application provides a pressurized water reactor rod replacement control system, which may include:

[0183] The data acquisition module 810 is used to acquire the differential value relationship of each control rod in the two sets of control rods. The differential value relationship includes the correspondence between the differential value of the corresponding set of control rods and the number of insertion steps of the control rods in that set. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod. The two sets of control rods need to exchange the number of insertion steps during the rod switching process.

[0184] The reactivity determination module 820 is used to determine the average reactivity of the two sets of control rods per unit time based on the differential value relationship of each set of control rods.

[0185] The movement step determination module 830 is used to determine the movement step of each group of control rods based on the average responsiveness of each group of control rods.

[0186] The movement speed determination module 840 is used to determine the target movement speed of each group of control rods based on the number of steps each group of control rods moves.

[0187] The rod-changing control module 850 is used to control each group of control rods to change rods according to their respective target moving speed.

[0188] In some implementations, the reactivity determination module 820 may be specifically used for:

[0189] Obtain the estimated rod change time and integral value within the estimated rod change time for each group of control rods. The integral value is used to characterize the reactive change caused by moving each group of control rods from one rod position to another within the estimated rod change time.

[0190] Based on the differential value relationship of each group of control rods, determine the average differential value of each group of control rods;

[0191] The smooth movement speed of each control rod group is determined based on the average differential value, integral value, and expected rod replacement time.

[0192] Determine the average speed of smooth movement of the two sets of control rods based on the smooth movement speed of each set of control rods.

[0193] The average responsiveness of the two sets of control rods per unit time is determined based on the steady-moving average velocity.

[0194] In some implementations, the reactivity determination module 820 may be specifically used for:

[0195] Based on the differential value relationship of each group of control rods, determine the target differential value range corresponding to each group of control rods, and the variation range of differential value within the target differential value range is within a preset range;

[0196] Calculate the average differential value of each group of control rods within their respective target differential value range.

[0197] In some implementations, the reactivity determination module 820 may be specifically used for:

[0198] For each group of control rods, select multiple differential values ​​within the target differential value range from the differential value relationship;

[0199] The average differential value of each control bar is calculated by averaging multiple differential values ​​to obtain the average differential value of each control bar within its respective target differential value range.

[0200] In some implementations, the movement step determination module 830 can be specifically used for:

[0201] Obtain the initial position of each control rod group;

[0202] The control rod replacement process is divided into rod position intervals to obtain at least two rod position intervals ordered according to their order. The at least two rod position intervals include the first rod position interval ordered first and the second rod position interval ordered last. The interval reactivity of the first rod position interval and the second rod position interval is equal.

[0203] Based on the initial position of each group of control rods, determine one of the first position interval and the second position interval corresponding to each group of control rods;

[0204] Based on the interval reactivity and the initial position of each group of control rods, the final position of each group of control rods within the corresponding position interval is obtained.

[0205] Based on the initial and final positions of the control rods, determine the number of steps each control rod will move.

[0206] In some implementations, the moving speed determination module 840 may be specifically used for:

[0207] Based on the interval reactivity and average reactivity, the movement time of each control rod in the corresponding rod position interval is calculated;

[0208] Based on the number of steps and the time taken, the moving speed of each control rod in the corresponding rod position range is calculated.

[0209] The ratio of the moving speed to the steady moving average speed is determined as the normalized speed variation factor for each group of control bars in the corresponding first bar position interval. The steady moving average speed is determined based on the differential value relationship of each group of control bars.

[0210] If the normalized velocity variation factor meets the preset conditions, then the moving speed will be used as the target moving speed for each group of control rods.

[0211] In some implementations, the moving speed determination module 840 may be specifically used for:

[0212] The absolute value of the difference between the normalized velocity change factor and the pre-acquired first adjustment factor is taken as the first fluctuation value;

[0213] Under the preset condition that the first fluctuation value is less than the pre-acquired second adjustment factor, the moving speed is used as the target moving speed for each group of control rods.

[0214] It should be noted that since the pressurized water reactor rod replacement control system in this embodiment is based on the same inventive concept as the pressurized water reactor rod replacement control 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.

[0215] Reference Figure 9 This application also provides an electronic device, which may include:

[0216] At least one memory;

[0217] At least one processor;

[0218] At least one program;

[0219] The program is stored in memory, and the processor executes at least one program to implement the pressurized water reactor rod replacement control method described above in this disclosure.

[0220] This electronic device can be any smart terminal, including mobile phones, tablets, personal digital assistants (PDAs), and in-vehicle computers.

[0221] The electronic devices according to embodiments of this application will now be described in detail.

[0222] The processor 910 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 disclosure.

[0223] The memory 920 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 920 can store the operating system and other application programs. 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 920 and called by the processor 910 to execute the pressurized water reactor rod replacement control method of the embodiments of this disclosure.

[0224] The input / output interface 930 is used to implement information input and output;

[0225] The communication interface 940 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0226] Bus 950 transmits information between various components of the device (e.g., processor 910, memory 920, input / output interface 930, and communication interface 940);

[0227] The processor 910, memory 920, input / output interface 930 and communication interface 940 are connected to each other within the device via bus 950.

[0228] This disclosure also provides a storage medium, which is a computer-readable storage medium storing computer-executable instructions for causing a computer to execute the above-described pressurized water reactor rod replacement control method.

[0229] 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.

[0230] The embodiments described in this disclosure are for the purpose of more clearly illustrating the technical solutions of this disclosure and do not constitute a limitation on the technical solutions provided by this disclosure. 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 this disclosure are also applicable to similar technical problems.

[0231] 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 disclosure, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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 pressurized water reactor rod replacement control method, characterized in that, The method includes: Obtain the differential value relationship of each control rod in two sets of control rods. The differential value relationship includes the correspondence between the differential value of a corresponding set of control rods and the number of insertion steps of that set of control rods. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod. The two sets of control rods need to exchange the number of insertion steps during the rod switching process. Based on the differential value relationship of each set of control rods, the average reactivity of the two sets of control rods per unit time is determined; The number of steps to move for each group of control rods is determined based on the average responsiveness of each group of control rods. The target moving speed of each group of control rods is determined based on the number of steps each group of control rods moves. The control rods in each group are switched according to the movement speed of their respective targets.

2. The pressurized water reactor rod replacement control method according to claim 1, characterized in that, The determination of the average reactivity of the two sets of control rods per unit time based on the differential value relationship of each set of control rods includes: The estimated rod replacement time and integral value of the estimated rod replacement time for each group of control rods are obtained. The integral value is used to characterize the reactive change caused by the movement of each group of control rods from one rod position to another rod position within the estimated rod replacement time. Based on the differential value relationship of each group of control rods, the average differential value of each group of control rods is determined; The smooth moving speed of each group of control rods is determined based on the average differential value, the integral value, and the expected rod changing time. Based on the smooth movement speed of each group of control rods, determine the average smooth movement speed of the two groups of control rods. The average responsiveness of the two sets of control rods per unit time is determined based on the average steady-movement speed.

3. The pressurized water reactor rod replacement control method according to claim 2, characterized in that, The determination of the average differential value of each group of control rods based on the differential value relationship of each group of control rods includes: Based on the differential value relationship of each group of control rods, the target differential value range corresponding to each group of control rods is determined, and the variation range of differential value in the target differential value range is within a preset range; Calculate the average differential value of each group of control rods within their respective target differential value range.

4. The pressurized water reactor rod replacement control method according to claim 3, characterized in that, The calculation of the average differential value of each group of control rods within their respective target differential value range includes: For each group of control rods, select multiple differential values ​​within the target differential value range from the differential value relationship; The average differential value of each group of control rods is calculated by averaging the multiple differential values ​​to obtain the average differential value of each group of control rods within their respective target differential value range.

5. The pressurized water reactor rod replacement control method according to claim 1, characterized in that, The step of determining the number of movement steps for each group of control rods based on the average responsiveness of each group of control rods includes: Obtain the initial rod position for each group of control rods; The rod position interval of the control rod replacement process is divided to obtain at least two rod position intervals ordered according to the order of the rod position intervals. The at least two rod position intervals include a first rod position interval ordered first and a second rod position interval ordered last. The interval reactivity of the first rod position interval and the second rod position interval is equal. Based on the initial position of each group of control rods, determine whether each group of control rods corresponds to one of the first position interval and the second position interval; Based on the interval reactivity and the initial position of each group of control rods, the final position of each group of control rods within the corresponding position interval is obtained; The number of movement steps for each group of control rods is determined based on the initial rod position and the final rod position.

6. The pressurized water reactor rod replacement control method according to claim 5, characterized in that, Determining the target moving speed of each group of control rods based on the number of steps each group of control rods has taken includes: Based on the interval reactivity and the average reactivity, the movement time of each group of control rods within the corresponding rod position interval is calculated; Based on the number of steps and the time taken, the moving speed of each control rod in the corresponding rod position interval is calculated. The ratio of the moving speed to the steady moving average speed is determined as the normalized speed variation factor of each group of control rods in the corresponding first rod position interval. The steady moving average speed is determined based on the differential value relationship of each group of control rods. If the normalized speed change factor meets the preset conditions, then the moving speed is taken as the target moving speed of each group of control rods.

7. The pressurized water reactor rod replacement control method according to claim 6, characterized in that, If the normalized speed change factor meets a preset condition, then the moving speed is used as the target moving speed for each group of control rods, including: The absolute value of the difference between the normalized velocity change factor and the pre-acquired first adjustment factor is taken as the first fluctuation value; When the preset condition is that the first fluctuation value is less than the pre-acquired second adjustment factor, the moving speed is taken as the target moving speed of each group of control rods.

8. A pressurized water reactor rod changing control system, characterized in that, The system includes: The data acquisition module is used to acquire the differential value relationship of each control rod in two sets of control rods. The differential value relationship includes the correspondence between the differential value of a corresponding set of control rods and the number of insertion steps of that set of control rods. The differential value is used to characterize the reactive change caused by the control rod moving a unit distance from different heights. Each set of control rods includes at least one control rod, and the two sets of control rods need to exchange the number of insertion steps during the rod switching process. The reactivity determination module is used to determine the average reactivity of the two sets of control rods per unit time based on the differential value relationship of each set of control rods. The movement step determination module is used to determine the movement step of each group of control rods based on the average responsiveness of each group of control rods; The movement speed determination module is used to determine the target movement speed of each group of control rods based on the number of movement steps of each group of control rods; The rod-changing control module is used to control each group of control rods to change rods according to their respective target moving speed.

9. The pressurized water reactor rod replacement control system according to claim 8, characterized in that, The reactivity determination module is also used for: Obtain the estimated rod change time and integral value within the estimated rod change time for each group of control rods. The integral value is used to characterize the reactive change caused by moving each group of control rods from one rod position to another within the estimated rod change time. Based on the differential value relationship of each group of control rods, determine the average differential value of each group of control rods; The smooth movement speed of each control rod group is determined based on the average differential value, integral value, and expected rod replacement time. Determine the average speed of smooth movement of the two sets of control rods based on the smooth movement speed of each set of control rods. The average responsiveness of the two sets of control rods per unit time is determined based on the steady-moving average velocity.

10. The pressurized water reactor rod replacement control system according to claim 8, characterized in that, The reactivity determination module is also used for: Based on the differential value relationship of each group of control rods, determine the target differential value range corresponding to each group of control rods, and the variation range of differential value within the target differential value range is within a preset range; Calculate the average differential value of each group of control rods within their respective target differential value range.

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