A method, apparatus, equipment, and medium for correcting control rod calibration curves.

Abstract

This invention provides a method, apparatus, device, and medium for correcting control rod calibration curves. The correction method includes: acquiring a reference temperature curve during a load reduction period; correcting the reference temperature curve based on the negative reactivity introduced by xenon to generate a xenon correction curve; calculating an overheat correction curve based on a set balance coefficient, a primary loop completely untracked curve, and the xenon correction curve; calculating the power data in the overheat correction curve and its corresponding overheat correction power data based on the overheat correction curve and the reference temperature curve, and generating an overheat correction parameter set; and correcting the control rod calibration curve based on the overheat correction parameter set to generate a corrected control rod calibration curve. The method, apparatus, device, and medium provided by this invention can correct control rod calibration curves to adapt to different generating units.

Description

Technical Field

[0001] This invention relates to the field of nuclear power, and in particular to a method, apparatus, equipment and medium for correcting control rod calibration curves. Background Technology

[0002] The control rod calibration curve (G9 curve) is a crucial function for achieving power matching between the primary and secondary loops of a reactor. In nuclear power plant operation, the G9 curve ensures that the reactor core power matches the turbine load, maintaining the safe and efficient operation of the plant. Currently, most nuclear power units under construction and in operation in China employ a long-established G9 curve calibration method. This method is based on reactivity balance calibration and corrects for superheat parameters on the curve.

[0003] Different reactor types exhibit significant differences in their thermal-hydraulic characteristics, material properties, and operating conditions. However, existing verification methods consistently use the same superheat parameter for correction across different reactor types. This can lead to deviations in verification results, thereby affecting the overall performance and safety of the nuclear power plant. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to provide a method, apparatus, device, and medium for correcting control rod calibration curves, which can correct control rod calibration curves to adapt to different units.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention provides a method for correcting a control bar calibration curve, comprising:

[0007] During the load reduction period, obtain the reference temperature profile;

[0008] The reference temperature curve is corrected based on the negative reactivity introduced by xenon to generate a xenon correction curve;

[0009] The overheating correction curve is calculated based on the set balance coefficient, the first loop completely untracked curve, and the xenon correction curve.

[0010] Based on the overheating correction curve and the reference temperature curve, calculate the power data in the overheating correction curve and its corresponding overheating correction power data, and generate an overheating correction parameter set;

[0011] The control rod calibration curve is corrected based on the overheat correction parameter set to generate a corrected control rod calibration curve.

[0012] In one embodiment of the present invention, the step of obtaining a reference temperature curve during the load reduction period includes:

[0013] Based on the acquired overheat protection data, overcooling protection data, the first temperature data corresponding to the core when the power data is at its maximum, and the second temperature data corresponding to the core when the power data is at its minimum, the corresponding overcooling protection curve and overheat protection curve are generated.

[0014] During the load reduction period, a reference temperature curve is generated based on the subcooling temperature curve and the superheat temperature curve.

[0015] In one embodiment of the present invention, the step of generating a reference temperature curve based on the subcooling temperature curve and the superheating temperature curve during the load reduction period includes:

[0016] During the load reduction period, the reactor core is subjected to load reduction processing according to preset conditions, and corresponding reference temperature data is obtained based on the power data.

[0017] The first temperature data, power data, and their corresponding reference temperature data are fitted to generate a reference temperature curve.

[0018] In one embodiment of the present invention, the step of correcting the reference temperature curve based on the negative reactivity introduced by xenon to generate a xenon correction curve includes:

[0019] Obtain the functional relationship between power data and the negative reactivity introduced by xenon;

[0020] Based on the ratio of the stated functional relationship to the temperature coefficient, calculate the power data and its corresponding xenon temperature data, and generate a xenon correction dataset;

[0021] The reference temperature curve is corrected based on the xenon correction dataset to generate a xenon correction curve.

[0022] In one embodiment of the present invention, the step of correcting the reference temperature curve based on the xenon correction dataset to generate a xenon correction curve includes:

[0023] Obtain the power data and its corresponding xenon temperature data from the xenon correction dataset, and obtain the power data and its corresponding reference temperature data from the reference temperature curve;

[0024] For each power data point, the sum of the corresponding xenon temperature data and the corresponding reference temperature data is calculated to generate the corresponding xenon corrected temperature data.

[0025] Each power data point and its corresponding xenon correction temperature data are fitted to generate a xenon correction curve.

[0026] In one embodiment of the present invention, the step of calculating the overheating correction curve based on the set balance coefficient, the first-loop completely untracked curve, and the xenon correction curve includes:

[0027] A loop-completely untracked curve is set based on the first temperature data in the reference temperature curve;

[0028] Based on the set balance coefficient, the first-loop untracked curve, and the xenon correction curve, an overheating correction curve is generated.

[0029] In one embodiment of the present invention, the step of generating an overheating correction curve based on a set balance coefficient, the first-loop completely untracked curve, and the xenon correction curve includes:

[0030] For each power data point, determine the constant temperature data of the untracked curve of the first loop and the xenon-corrected temperature data of the xenon-corrected curve;

[0031] Based on the set balance coefficient, the constant temperature data, and the corresponding xenon correction temperature data, the overheat correction temperature data is calculated; wherein, under each power data, the difference between the constant temperature data and the overheat correction temperature data is recorded as the first temperature difference, and the difference between the overheat correction temperature data and the xenon correction temperature data is recorded as the second temperature difference, and the ratio of the first temperature difference to the corresponding second temperature difference is equal to the balance coefficient.

[0032] For each power data point and its corresponding overheat correction temperature data, a fitting process is performed to generate an overheat correction curve.

[0033] In one embodiment of the present invention, the step of calculating the power data in the overheating correction curve and its corresponding overheating correction power data based on the overheating correction curve and the reference temperature curve, and generating an overheating correction parameter set includes:

[0034] For each power data point, the difference between the overheat correction temperature data in the overheat correction curve and the reference temperature data in the reference temperature curve is calculated to generate temperature difference correction data.

[0035] The temperature difference correction data corresponding to each power data is input into the reference temperature curve to calculate the corresponding overheat correction power data;

[0036] A set of overheat correction parameters is generated based on each power data point and its corresponding overheat correction power data.

[0037] In one embodiment of the present invention, the step of correcting the control rod calibration curve according to the overheating correction parameter set to generate a corrected control rod calibration curve includes:

[0038] For each power data point, the difference between the corresponding overheat correction power data and the initial correction power data in the control rod calibration curve is calculated to generate the target correction data; wherein, the control rod calibration curve represents the relationship between the power data and the control rod position, and each power data point in the control rod calibration curve corresponds to an initial correction power data point and a control rod position;

[0039] The corresponding power data is corrected based on the target correction data to generate corrected power data.

[0040] The corrected power data is fitted with the corresponding control rod position to generate a corrected control rod calibration curve.

[0041] The present invention also provides a correction device for a control bar calibration curve, comprising:

[0042] The data acquisition module is used to acquire a reference temperature profile during the load reduction period;

[0043] The first correction module is used to correct the reference temperature curve based on the negative reactivity introduced by xenon, and generate a xenon correction curve.

[0044] The second correction module is used to calculate the overheating correction curve based on the set balance coefficient, the first loop completely untracked curve, and the xenon correction curve.

[0045] The data calculation module is used to calculate the power data in the overheating correction curve and its corresponding overheating correction power data based on the overheating correction curve and the reference temperature curve, and to generate an overheating correction parameter set.

[0046] The third correction module is used to correct the control rod calibration curve according to the overheat correction parameter set and generate the corrected control rod calibration curve.

[0047] The present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the control bar calibration curve correction method.

[0048] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the step of correcting the control bar calibration curve.

[0049] As described above, this invention provides a method, apparatus, equipment, and medium for correcting control rod calibration curves. By guiding the correction of superheat correction parameters for the control rod calibration curves, it ensures that the control rod calibration curves accurately reflect changes in the reactor's physical characteristics under different cycles, loading schemes, and burnup conditions. By assessing the potential risks of overcooling and overheating caused by primary loop temperature during control rod calibration curve testing, it helps operators make safer decisions during testing. Reasonable superheat correction parameter settings can effectively reduce the testing risks of subsequent control rod calibrations and improve the success rate of the tests. Different units may have different core characteristics and power requirements; by setting personalized superheat correction parameters for different units, it ensures more precise and safer operation control for each unit. In the first and subsequent cycles, changes in the core isothermal temperature coefficient affect the reactor's thermal-hydraulic characteristics; reasonable superheat correction can compensate for these changes, ensuring accurate temperature control and reducing the risks of subsequent tests.

[0050] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a flowchart of a method for correcting a control rod calibration curve according to an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the overcooling protection curve, the overheating protection curve, and the reference temperature curve in one embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram illustrating the negative reactivity introduced by xenon poisoning during load reduction in one embodiment of the present invention;

[0055] Figure 4 This is a schematic diagram of the temperature changes in the primary and secondary circuits during load reduction in one embodiment of the present invention;

[0056] Figure 5 This is a schematic diagram of a xenon correction curve in one embodiment of the present invention;

[0057] Figure 6 This is a schematic diagram of a completely untracked loop curve in one embodiment of the present invention;

[0058] Figure 7This is a schematic diagram of the overheating correction curve when the balance coefficient is 3 in one embodiment of the present invention;

[0059] Figure 8 This is a schematic diagram of the overheating correction curve when the balance coefficient is 4 in one embodiment of the present invention;

[0060] Figure 9 This is a schematic diagram of the modified control rod calibration curve in one embodiment of the present invention;

[0061] Figure 10 This is a schematic diagram of a correction device for a control bar calibration curve according to an embodiment of the present invention.

[0062] Figure 11 This is a schematic diagram of an electronic device according to an embodiment of the present invention.

[0063] In the picture:

[0064] 100. Data acquisition module; 200. First correction module; 300. Second correction module; 400. Data calculation module; 500. Third correction module; 1. Electronic device; 12. Memory; 13. Processor. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] Please see Figure 1 This invention discloses a method for correcting control rod calibration curves, which can be used to correct control rod calibration curves so that the corrected control rod calibration curves can be applied to overheat correction of units with different technology series and power ratings. The correction method may include the following steps:

[0067] Step S10: During the load reduction period, obtain the reference temperature profile;

[0068] Step S20: Correct the reference temperature curve based on the negative reactivity introduced by xenon to generate a xenon correction curve;

[0069] Step S30: Calculate the overheating correction curve based on the set balance coefficient, the first loop completely untracked curve, and the xenon correction curve;

[0070] Step S40: Based on the overheating correction curve and the reference temperature curve, calculate the power data in the overheating correction curve and its corresponding overheating correction power data, and generate an overheating correction parameter set.

[0071] Step S50: Correct the control rod calibration curve according to the overheat correction parameter set to generate the corrected control rod calibration curve.

[0072] In one embodiment, when performing step S10, step S10 may specifically include the following steps:

[0073] Step S11: Based on the acquired overheat protection data, overcooling protection data, the first temperature data corresponding to the core when the power data is at its maximum, and the second temperature data corresponding to the core when the power data is at its minimum, generate the corresponding overcooling protection curve and overheat protection curve.

[0074] Step S12: During the load reduction period, generate a reference temperature curve based on the subcooling temperature curve and the superheat temperature curve.

[0075] Please see Figure 2 In one embodiment, when step S11 is performed, the setting of the control rod calibration curve is specifically used to ensure power balance between the primary and secondary loops of the reactor. The primary loop is the reactor coolant system, and the secondary loop is the turbine system.

[0076] In one embodiment, during steady-state operation, power balance refers to the matching of the thermal energy generated by the reactor with the thermal energy demand of the secondary loop system. Under normal operating conditions, the reactor is in a steady state with a relatively constant power output. At this time, the control rod calibration curve should ensure the power balance between the primary and secondary loops, enabling the reactor to operate safely and efficiently.

[0077] In one embodiment, during transient events, power balancing needs to ensure the reactor can respond rapidly to load changes without triggering protective actions. When load changes or other transient events occur, the reactor needs to quickly adjust its power output to match the demands of the secondary loop. In this case, the control rod calibration curve should ensure power balance between the primary and secondary loops during transient events, while preventing the reactor from overheating or overcooling.

[0078] In one embodiment, assuming no significant deviation in the initial control rod position settings, the control of the transient process during the test primarily focuses on reactor superheat. Superheat refers to the temperature difference between the primary coolant temperature and the secondary steam generator outlet steam temperature. Superheat control needs to consider both undercooling and overheating protection.

[0079] In one embodiment, overcooling protection refers to the reduction in the primary loop average temperature caused by control rod insertion (insertion rod) or xenon poisoning during testing. To prevent triggering the overcooling protection signal (C22 signal), load reduction should be stopped when the primary loop average temperature falls below the overcooling protection data (4°C). The C22 signal is used to trigger overcooling protection to prevent equipment damage or system failure due to excessively low temperatures.

[0080] In one embodiment, overheat protection refers to the possibility that if the core temperature becomes too high during testing, the protective valve GCT-A of the steam generator may open, potentially causing a safety issue. Therefore, when the core overheats beyond the overheat protection threshold (6°C), load reduction should be stopped to prevent core overheating.

[0081] In one embodiment, a specific reactor unit is used as an example. First, the first temperature data corresponding to the reactor core at its maximum power output can be obtained, i.e., at 100% power, the primary circuit temperature is 304°C. Subsequently, the second temperature data corresponding to the reactor core at its minimum power output can be obtained, i.e., at 0% power, the primary circuit temperature is 292°C. The temperature difference between 100% and 0% power output for this reactor unit is 12°C.

[0082] Please see Figure 2 In one embodiment, when plotting the overcooling protection curve, at 100% power, the primary circuit temperature is 304°C, and the minimum allowable temperature is 304°C - 4°C = 300°C. At 0% power, the primary circuit temperature is 292°C, and the minimum allowable temperature is 292°C - 4°C = 288°C. These two points can then be connected to plot the overcooling protection curve (e.g., ...). Figure 2 (Supercooling control in the system is -4℃). Figure 2 The horizontal axis represents the unit's power data, expressed as a percentage; the vertical axis represents the relative temperature (temperature relative to the reference temperature of 294°C).

[0083] Please see Figure 2 In one embodiment, when plotting the overheat protection curve, at 100% power, the primary circuit temperature is 304°C, and the minimum allowable temperature is 304°C + 6°C = 310°C. At 0% power, the primary circuit temperature is 292°C, and the minimum allowable temperature is 292°C + 6°C = 298°C. These two points can then be connected to plot the overheat protection curve (e.g., ...). Figure 2 (Superheat control +6℃).

[0084] In one embodiment, when performing step S12, step S12 may specifically include the following steps:

[0085] Step S121: During the load reduction period, the reactor core is subjected to load reduction treatment according to preset conditions, and the corresponding reference temperature data is obtained based on the power data.

[0086] Step S122: Fit the first temperature data, power data and their corresponding reference temperature data to generate a reference temperature curve.

[0087] In one embodiment, when step S121 is executed, the specific, preset conditions can be expressed as follows: at the start of the test, the turbine load is reduced from 100% FP at a rate of 30 MW / min to 100 MW, and then reduced to 50% FP at a rate of 50 MW / min. For example, at the start of the test, the turbine load is reduced from 100% FP (full power). The test is conducted in two phases: the first phase reduces the load by 100 MW at a rate of 30 MW / min; the second phase reduces the load to 50% FP at a rate of 50 MW / min. The objective of the test is to rapidly reduce the reactor load from 100% FP to 50% FP, and collect data on the changes in parameters of the primary and secondary loops during this process. These parameters may include power data and reference temperature data. During the load reduction period, the core power and corresponding reference temperature data at each moment need to be recorded.

[0088] Please see Figure 2 In one embodiment, after obtaining the first temperature data (304°C), power data, and their corresponding reference temperature data, these data can be fitted to generate a reference temperature curve (e.g., ...). Figure 2 (Reference temperature tracking in the system).

[0089] In one embodiment, when performing step S20, step S20 may specifically include the following steps:

[0090] Step S21: Obtain the functional relationship between power data and the negative reactivity introduced by xenon;

[0091] Step S22: Calculate the power data and its corresponding xenon temperature data based on the ratio of the functional relationship to the temperature coefficient, and generate a xenon correction dataset;

[0092] Step S23: Correct the reference temperature curve based on the xenon correction dataset to generate the xenon correction curve.

[0093] In one embodiment, when performing step S21, specifically, xenon-135 is a strong neutron absorber whose concentration is closely related to the reactor's neutron flux level. Neutron flux refers to the number of neutrons passing through a unit area per unit time. The reactor's power level is primarily determined by the neutron flux. Xenon-135 is mainly produced by the β decay of the fission product iodine-135. The half-life of iodine-135 is approximately 6.7 hours, while the half-life of xenon-135 is approximately 9.2 hours. When reactor power decreases, the neutron flux decreases, the production rate of iodine-135 decreases, but its decay rate into xenon-135 remains high, leading to an increase in xenon-135 concentration. When reactor power decreases, the xenon-135 concentration initially increases to a maximum value because the decay of iodine-135 continues to produce xenon-135, while the neutron absorption process of xenon-135 slows down. Increased xenon-135 concentration leads to the absorption of more neutrons, introducing negative reactivity, which further reduces core power. As power decreases and neutron flux further diminishes, the xenon-135 production rate decreases, while its absorption rate remains high, causing its concentration to gradually decrease and tend towards a lower equilibrium value. In this experiment, only short-term effects (e.g., within a few minutes) are considered; long-term effects (e.g., after several hours) are not taken into account.

[0094] Please see Figure 3 In one embodiment, during testing, the measurement of xenon toxicity as a function of power is based on specific values ​​under specific core power conditions. For example, a nuclear power plant physics report provides a functional relationship between power data and the negative reactivity introduced by xenon during the first cycle as power is reduced from full power (100% FP) to 50% FP. At a specific power level, the corresponding negative reactivity value introduced by xenon toxicity can be found. The functional relationship between power data and the negative reactivity introduced by xenon can be expressed as: .in, This is represented by the negative reactivity introduced by xenon. This is represented as the power data of the reactor core. For example... Figure 3 As shown, Figure 3 The horizontal axis represents the unit's power data, expressed as a percentage, i.e., relative power; the vertical axis represents the negative reactivity introduced by xenon, i.e., xenon reactivity.

[0095] In one embodiment, the temperature coefficient refers to the change in reactor reactivity as the core temperature changes. During the experiment, the temperature coefficient is negative, meaning that reactivity decreases as the core temperature increases and increases as the core temperature decreases. When power decreases, the xenon poison concentration increases, introducing negative reactivity and causing a further decrease in core power. Due to the negative reactivity introduced by xenon poison, the core temperature will initially decrease. However, because the temperature coefficient is negative, the decrease in core temperature leads to an increase in reactivity, partially offsetting the negative reactivity of xenon poison, causing the core temperature to partially recover. This partial recovery of the core temperature generates positive superheat. Superheat refers to the difference between the temperature of the primary coolant and the temperature of the steam exiting the secondary steam generator. Therefore, although the decrease in power causes the core temperature to decrease, the effect of the temperature coefficient causes the core temperature to partially recover, thus generating positive superheat.

[0096] In one embodiment, when performing step S22, specifically, the moderator temperature coefficient refers to the effect of temperature changes in the moderator (typically light or heavy water) on reactor reactivity. The moderator temperature coefficient is a function of power, boron concentration, and temperature difference, expressed as: Where CB represents the boron concentration, which remains constant during the test; This is the temperature of the primary circuit, which can also be considered constant during the experiment. At this point, a function relating the temperature coefficient and power data can be obtained, expressed as: Subsequently, the reactivity introduced by the change in the temperature coefficient of the moderator can be expressed as follows: ,in, Represented as reactivity, It can be expressed as a function of temperature coefficient and power data. This represents the corresponding xenon temperature data. Finally, based on the ratio of the functional relationship to the temperature coefficient, the power data and its corresponding xenon temperature data can be calculated, generating a xenon-corrected dataset. The xenon-corrected dataset represents the risk range of standard superheat and can be used to characterize superheat disturbances that may be caused by xenon toxicity in the unit.

[0097] Please see Figure 4 In one embodiment, during the load reduction test, the temperature changes in the primary and secondary loops exhibit a time-disequilibrium state. When the turbine load decreases rapidly, the average temperature of the secondary loop drops rapidly. The primary loop's temperature control system adjusts to follow the secondary loop's temperature reference value, but due to the lag in core response, its temperature change lags behind the secondary loop. In the initial stage of load reduction, the primary loop's temperature drop following the secondary loop's has just begun, therefore the primary loop's temperature will be higher than the equilibrium temperature. The primary loop temperature will lag in its change during the transient process, manifesting as primary loop superheat. At this time, the unit's responsiveness primarily stems from the negative responsiveness introduced during the control rod insertion process. Figure 4 As shown, Figure 4The horizontal axis represents time in seconds; the vertical axis represents temperature. Indicates the primary circuit temperature; This indicates the temperature of the secondary circuit.

[0098] In one embodiment, when performing step S23, step S23 may specifically include the following steps:

[0099] Step S231: Obtain the power data and its corresponding xenon temperature data from the xenon correction dataset, and obtain the power data and its corresponding reference temperature data from the reference temperature curve.

[0100] Step S232: Calculate the sum of the corresponding xenon temperature data and the corresponding reference temperature data for each power data, and generate the corresponding xenon corrected temperature data;

[0101] Step S233: Fit each power data and its corresponding xenon correction temperature data to generate a xenon correction curve.

[0102] In one embodiment, when step S231 is performed, specifically, as the reactor power decreases, the xenon poison concentration initially increases, introducing negative reactivity. This hysteretic change causes the core temperature to decrease initially, but the temperature change lags behind the power change. The reference temperature profile needs to be corrected based on the hysteretic change in xenon poison to generate a new xenon correction profile. The corrected profile reflects the hysteretic decrease in core temperature during the initial stage of power reduction.

[0103] In one embodiment, the negative reactivity introduced by xenon poisoning causes an initial drop in core temperature. Subsequently, due to the negative temperature coefficient, the core temperature partially recovers, resulting in positive superheat. Therefore, the superheat correction needs to take this positive change into account. Since the change in primary loop power lags behind the decrease in secondary loop turbine load, the change in superheat is uncertain in the initial stage of power reduction. Therefore, a risk range (soft correction) is applied to ensure safety.

[0104] In one embodiment, the negative reactivity introduced by xenon poisoning is closely related to the primary loop power. When the secondary loop turbine load decreases, the average temperature of the secondary loop drops rapidly, but the core power of the primary loop has not yet decreased significantly, resulting in no decrease in the average temperature. The change in primary loop temperature lags behind the change in power and needs to be adjusted using a xenon correction curve to ensure that the risk range of the test temperature remains within a safe range. The xenon correction curve refers to the risk range of the test temperature.

[0105] In one embodiment, when correcting the reference temperature curve, the power data and its corresponding xenon temperature data in the xenon correction dataset can be obtained, as well as the power data and its corresponding reference temperature data in the reference temperature curve.

[0106] In one embodiment, during step S232, specifically, for each power data point, the corresponding reference temperature data is corrected based on the xenon temperature data to generate corrected xenon temperature data. For each power data point, the reference temperature data is corrected based on the xenon temperature data to generate corrected xenon temperature data. The corrected xenon temperature data can be obtained by adding the corresponding xenon temperature data to the corresponding reference temperature data.

[0107] Please see Figure 5 In one embodiment, during step S233, specifically, each power data point and its corresponding corrected xenon temperature data are fitted to generate a xenon correction curve (e.g., ...). Figure 5 The reference temperature (xenon toxicity correction) is used. For example, linear regression, polynomial fitting, or other suitable mathematical methods can be used for fitting. Simultaneously, based on the xenon correction dataset, a corresponding supercooling temperature correction curve (such as...) is generated. Figure 5 The supercooling control is -4℃ (xenon toxicity correction). Based on the xenon correction dataset, the corresponding superheat temperature correction curve is generated (e.g., ...). Figure 5 The overheat control is +6℃ (xenon poison correction). The undercooling temperature correction curve refers to the undercooling temperature curve after xenon poison correction, ensuring that the primary loop temperature does not drop too low when power decreases. The overheating temperature correction curve refers to the overheating temperature curve after xenon poison correction, ensuring that the primary loop temperature does not rise too high when power decreases.

[0108] In one embodiment, when performing step S30, step S30 may specifically include the following steps:

[0109] Step S31: Set a fully untracked curve for the first loop based on the first temperature data;

[0110] Step S32: Generate an overheating correction curve based on the set balance coefficient, the first loop completely untracked curve, and the xenon correction curve.

[0111] Please see Figure 6 In one embodiment, when step S31 is performed, specifically during the test, the temperature control rod is set to manual mode, and the temperature control rod does not automatically adjust to compensate for the deviation between the core temperature and the reference temperature. During the load reduction process, the primary loop temperature lags behind the reference temperature, causing the superheat to gradually increase. In extreme cases, if the primary loop does not cool down at all during the load reduction process, i.e., a primary loop completely fails to track the curve, then the superheat will reach its maximum value.

[0112] Please see Figure 6In one embodiment, in an extreme case, the temperature of the primary loop does not follow the temperature change of the secondary loop at all, meaning the primary loop temperature remains constant during load reduction. In this case, the primary loop completely untracked curve will form a horizontal line, showing a significant deviation from the downward trend of the reference temperature curve. That is, the primary loop completely untracked curve can be set based on the first temperature data (e.g., ...). Figure 6 One loop in the circuit was not tracked at all (t100%FP)).

[0113] In one embodiment, when performing step S32, step S32 may specifically include the following steps:

[0114] Step S321: Under each power data, determine the constant temperature data of the first loop completely untracked curve and the xenon correction temperature data of the xenon correction curve;

[0115] Step S322: Calculate the overheating correction temperature data based on the set balance coefficient, constant temperature data and corresponding xenon correction temperature data; wherein, under each power data, the difference between the constant temperature data and the overheating correction temperature data is recorded as the first temperature difference, and the difference between the overheating correction temperature data and the xenon correction temperature data is recorded as the second temperature difference, and the ratio of the first temperature difference to the corresponding second temperature difference is equal to the balance coefficient.

[0116] Step S323: Fit each power data and its corresponding overheat correction temperature data to generate an overheat correction curve.

[0117] In one embodiment, when performing step S321, specifically, the overheat correction is implemented to ensure that the primary loop power better tracks the turbine load changes of the secondary loop under transient conditions, while providing additional safety compensation. When the secondary loop turbine load drops rapidly, the primary loop power response will lag. If the power rods are under-inserted (i.e., the control rods are not fully inserted), it will lead to an overestimation of the primary loop power and an average primary loop temperature higher than the reference temperature. The overheat correction introduces additional negative reactivity, providing a safety-biased negative feedback compensation to the core during transient load tracking. By introducing negative reactivity, excessively high primary loop temperatures can be avoided, thereby preventing the opening of valves such as GCT-A and overheat protection activation.

[0118] In one embodiment, overheat correction is an upward adjustment of the xenon-corrected curve (after adjustment for primary loop temperature tracking), but not exceeding the primary loop's completely non-tracking temperature line. Specifically, under transient conditions, the primary loop temperature may lag behind the reference temperature due to a rapid load decrease. Overheat correction ensures the primary loop temperature remains within a safe range by adjusting the xenon-corrected curve upward. The upper limit of overheat correction is the primary loop's completely non-tracking temperature line, i.e., the temperature curve assuming the primary loop does not cool down at all during load reduction.

[0119] In one embodiment, a larger overheat correction results in greater control rod under-insertion, a stronger inherent negative reactivity, and greater unit safety during transient changes. A larger overheat correction can provide stronger negative feedback, reducing the risk of core temperature rise and preventing overheat protection activation. However, an excessively large overheat correction will lead to further lag in the primary circuit temperature tracking reference temperature, affecting the reactor's load tracking performance.

[0120] In one embodiment, during the actual control rod calibration curve verification test performed on different units, the overheating during the transient process consistently approaches the protection and test stop edge. Specifically, the overheating approaching the protection edge means that the primary loop temperature is close to or exceeds the overheat protection setpoint (e.g., 310°C), posing a potential risk of triggering protection action. To avoid protection action, the test may need to be stopped or parameters adjusted to ensure safety.

[0121] In one embodiment, a balance needs to be struck between safety and load tracking performance when setting overheat correction. Therefore, a balance factor can be set to determine the constant temperature data for a fully untracked loop and the xenon-corrected temperature data for the xenon-corrected loop at each power data point.

[0122] Please see Figure 7 and Figure 8 In one embodiment, when executing step S322, specifically, the overheating correction temperature data T2 can be calculated based on the balance coefficient a, the constant temperature data T1, and the corresponding xenon correction temperature data T3. Where a = (T1 - T2) / (T2 - T3). Here, T1 represents the temperature difference between full core power and zero core power, here represented as 12°C. Figure 7 and Figure 8 T1 represents the constant temperature data corresponding to the completely untracked circuit. T2 represents the overheating correction temperature data corresponding to the corrected overheating correction curve. Figure 7 and Figure 8 The values ​​in T1 represent the superheat correction temperature data corresponding to the new superheat correction (t superheat correction). T3 represents the correction temperature data corresponding to the xenon correction curve. Figure 7 and Figure 8 The value in the figure represents the corrected temperature data corresponding to the xenon poison correction of the reference temperature (t is the reference temperature after xenon poison correction).

[0123] Please see Figure 7 and Figure 8In one embodiment, for each power data, the difference between the constant temperature data and the overheating correction temperature data is denoted as the first temperature difference (T1-T2), and the difference between the overheating correction temperature data and the xenon correction temperature data is denoted as the second temperature difference (T2-T3). The ratio of the first temperature difference to the corresponding second temperature difference is equal to the balance coefficient.

[0124] Please see Figure 7 and Figure 8 In one embodiment, when performing step S323, specifically, after acquiring each power data and its corresponding overheat correction temperature data, a fitting process can be performed to generate an overheat correction curve. For example, in Figure 7 In this context, when a=3, the corresponding overheating correction curve can be obtained by fitting. For example, in... Figure 8 In this embodiment, when a=4, the corresponding overheating correction curve can be fitted. The specific value of a can be set according to actual needs (for example, the value of control rods can be set by considering the subsequent decay of the value and the change in neutron characteristics caused by the change in the core loading scheme after the loading amount). The smaller a is, the closer the fitted overheating correction curve is to the primary loop completely untracked line; the larger a is, the closer the fitted overheating correction curve is to the reference temperature xenon poisoning correction (t is the reference temperature after xenon poisoning correction).

[0125] In one embodiment, when performing step S40, step S40 may specifically include the following steps:

[0126] Step S41: Calculate the difference between the overheat correction temperature data in the overheat correction curve and the reference temperature data in the reference temperature curve for each power data, and generate temperature difference correction data.

[0127] Step S42: Input the temperature difference correction data corresponding to each power data into the reference temperature curve to calculate the corresponding overheat correction power data;

[0128] Step S43: Generate an overheat correction parameter set based on each power data and the corresponding overheat correction power data.

[0129] In one embodiment, when performing step S41, specifically, for each power data point, the overheat correction temperature data in the overheat correction curve and the reference temperature data in the reference temperature curve can be determined. Subsequently, for each power data point, the difference between the overheat correction temperature data and the corresponding reference temperature data can be calculated and denoted as the temperature difference correction data. At this point, each power data point will correspond to a temperature difference correction data point.

[0130] Please see Figure 7 and Figure 8In one embodiment, when step S42 is executed, specifically, since the reference temperature curve is linear, the decrease in the corresponding power data can be determined based on the temperature difference correction data. That is, for each temperature difference correction data, the corresponding overheat correction power data can be calculated based on the reference temperature curve. For example, from Figure 7 and Figure 8 It can be seen that when the power data decreases from 100% to 50%, the corresponding temperature data on the reference temperature curve decreases from 12℃ to 6℃. Since the reference temperature curve is linear, its slope and intercept can be calculated based on the above data. After obtaining the function of the reference temperature curve, the temperature difference correction data can be input into the function to calculate the corresponding overheat correction power data. For example, when the temperature difference correction data is 0.3℃ (decreasing from 9℃ to 8.7℃), the power data can decrease from 75% to 72.5%, that is, the overheat correction power data is 2.5%.

[0131] In one embodiment, when performing step S43, specifically, for each power data point, there is a corresponding temperature difference correction data point. For each temperature difference correction data point, there is a corresponding overheating correction power data point. Therefore, for each power data point, there is an corresponding overheating correction power data point. Finally, an overheating correction parameter set can be generated based on each power data point and its corresponding overheating correction power data point.

[0132] In one embodiment, as shown in Tables 1 and 2, when a=3 and 4, the corresponding overheating correction curves can be fitted. Then, each power data (Pe) and the corresponding overheating corrected power data (dPe) can be calculated according to the process described above.

[0133] Table 1: Set of overheating correction parameters when the equilibrium coefficient is equal to 3.

[0134]

[0135] Table 2: Set of overheating correction parameters when the equilibrium coefficient is equal to 4.

[0136]

[0137] In one embodiment, when performing step S50, step S50 may specifically include the following steps:

[0138] Step S51: Calculate the difference between the corresponding overheat correction power data and the corresponding initial correction power data in the control rod calibration curve for each power data, and generate the target correction data; wherein, the control rod calibration curve represents the relationship between the power data and the control rod position, and each power data in the control rod calibration curve corresponds to an initial correction power data and a control rod position respectively;

[0139] Step S52: Correct the corresponding power data according to the target correction data to generate corrected power data;

[0140] Step S53: Fit the corrected power data to the corresponding control rod position to generate the corrected control rod calibration curve.

[0141] Please see Figure 9 As shown in Table 3, in one embodiment, when performing step S51, specifically, the initial corrected power data corresponding to each power data can be determined by the control rod calibration curve.

[0142] Table 3: Power data in the control rod calibration curve and corresponding initial corrected power data.

[0143]

[0144] In one embodiment, for each power data point, there is an initial corrected power data point in the control rod calibration curve and an overheating corrected power data point in the overheating correction parameter set. Then, for each power data point, the difference between the initial corrected power data point and the corresponding overheating corrected power data point can be calculated and denoted as the target corrected power data point.

[0145] Please see Figure 9 In one embodiment, when step S52 is executed, specifically, after obtaining the power data and the corresponding target correction data, the corresponding power data can be corrected according to the target correction data to generate corrected power data.

[0146] In one embodiment, when executing step S53, specifically, since each power data corresponds to a control rod position, after obtaining the corrected power data, each corrected power data also corresponds to a control rod position. At this time, the corrected power data and the corresponding control rod position can be fitted to generate a corrected control rod calibration curve (e.g., ...). Figure 9 (The curve is after overheat correction). The uncorrected curve refers to the control rod calibration curve before correction. The preset curve refers to the curve calculated based on the unit's parameters. Figure 9 The horizontal axis in the graph can represent the control rod position, and the vertical axis can represent the core power. Core power is a specific numerical value. During fitting, the power data expressed as a percentage can be converted into a numerical value. For example, the power data at 100% FP can correspond to 1080 MW / min or 1060 MW / min.

[0147] As can be seen, the above scheme, by guiding the correction of superheat parameters in the control rod calibration curve, ensures that the control rod calibration curve accurately reflects the changes in the reactor's physical characteristics under different cycles, loading schemes, and burnup conditions. By assessing the potential risks of overcooling and overheating caused by primary loop temperature during control rod calibration curve testing, operators can make safer decisions during the tests. Reasonable superheat correction parameter settings can effectively reduce the test risks of subsequent control rod calibration and improve the test success rate. Different units may have different core characteristics and power requirements; by setting personalized superheat correction parameters for different units, the operation and control of each unit can be made more precise and safer. In the first and subsequent cycles, changes in the core isothermal temperature coefficient affect the reactor's thermal-hydraulic characteristics; reasonable superheat correction can compensate for these changes, ensuring the accuracy of temperature control and reducing the risks of subsequent tests.

[0148] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0149] Please see Figure 10 The present invention also provides a correction device for the control rod calibration curve, which corresponds one-to-one with the correction method in the above embodiments. The correction device may include a data acquisition module 100, a first correction module 200, a second correction module 300, a data calculation module 400, and a third correction module 500. The functions of each module are as follows:

[0150] In one embodiment, the data acquisition module 100 can be used to acquire a reference temperature profile during a load reduction period.

[0151] In one embodiment, the first correction module 200 can be used to correct the reference temperature curve based on the negative reactivity introduced by xenon, generating a xenon correction curve.

[0152] In one embodiment, the second correction module 300 can be used to calculate the overheating correction curve based on a set balance coefficient, a primary loop completely untracked curve, and the xenon correction curve.

[0153] In one embodiment, the data calculation module 400 can be used to calculate the power data in the overheating correction curve and its corresponding overheating correction power data based on the overheating correction curve and the reference temperature curve, and generate an overheating correction parameter set.

[0154] In one embodiment, the third correction module 500 can be used to correct the control rod calibration curve according to the overheat correction parameter set, and generate a corrected control rod calibration curve.

[0155] Specific limitations regarding the correction device can be found in the limitations of the correction method described above, and will not be repeated here. Each module in the aforementioned correction device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the memory in the computer device in hardware form, or stored in the memory of the computer device in software form, so that the memory can call and execute the operations corresponding to each module.

[0156] Please see Figure 11 In one embodiment, the electronic device 1 may include a memory 12, a processor 13, and a bus, and may also include a computer program stored in the memory 12 and executable on the processor 13, such as a program for correcting the control bar calibration curve.

[0157] In one embodiment, the memory 12 includes at least one type of readable storage medium, including flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 12 can be an internal storage unit of the electronic device 1, such as the portable hard drive of the electronic device 1. In other embodiments, the memory 12 can also be an external storage device of the electronic device 1, such as a plug-in portable hard drive, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the electronic device 1. Furthermore, the memory 12 can include both internal storage units and external storage devices of the electronic device 1. The memory 12 can be used not only to store application software and various types of data installed on the electronic device 1, such as the code for correcting the control bar calibration curve, but also to temporarily store data that has been output or will be output.

[0158] In one embodiment, the processor 13 may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor 13 is the control unit of the electronic device 1, connecting various components of the electronic device 1 through various interfaces and lines. It executes programs or modules stored in the memory 12 (e.g., programs for correcting control bar calibration curves) and calls data stored in the memory 12 to perform various functions and process data in the electronic device 1.

[0159] In one embodiment, the processor 13 executes the operating system of the electronic device 1 and various installed applications. The processor 13 executes the applications to implement the steps in the above-described method for correcting the control bar calibration curve.

[0160] In one embodiment, a computer program may be divided into one or more modules, one or more of which are stored in memory 12 and executed by processor 13 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in electronic device 1. For example, the computer program may be divided into a data acquisition module 100, a first correction module 200, a second correction module 300, a data calculation module 400, and a third correction module 500.

[0161] The embodiments of the present invention disclosed above are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for correcting a control bar calibration curve, characterized in that, include: During the load reduction period, obtain the reference temperature profile; The reference temperature curve is corrected based on the negative reactivity introduced by xenon to generate a xenon correction curve; The overheating correction curve is calculated based on the set balance coefficient, the first loop completely untracked curve, and the xenon correction curve. Based on the overheating correction curve and the reference temperature curve, calculate the power data in the overheating correction curve and its corresponding overheating correction power data, and generate an overheating correction parameter set; The control rod calibration curve is corrected based on the overheat correction parameter set to generate a corrected control rod calibration curve.

2. The method for correcting the control rod calibration curve according to claim 1, characterized in that, The step of obtaining the reference temperature profile during the load reduction period includes: Based on the acquired overheat protection data, overcooling protection data, the first temperature data corresponding to the core when the power data is at its maximum, and the second temperature data corresponding to the core when the power data is at its minimum, the corresponding overcooling protection curve and overheat protection curve are generated. During the load reduction period, a reference temperature curve is generated based on the subcooling temperature curve and the superheat temperature curve.

3. The method for correcting the control rod calibration curve according to claim 2, characterized in that, The step of generating a reference temperature curve based on the subcooling temperature curve and the superheating temperature curve during the load reduction period includes: During the load reduction period, the reactor core is subjected to load reduction processing according to preset conditions, and corresponding reference temperature data is obtained based on the power data. The first temperature data, power data, and their corresponding reference temperature data are fitted to generate a reference temperature curve.

4. The method for correcting the control rod calibration curve according to claim 3, characterized in that, The step of correcting the reference temperature curve based on the negative reactivity introduced by xenon to generate a xenon correction curve includes: Obtain the functional relationship between power data and the negative reactivity introduced by xenon; Based on the ratio of the stated functional relationship to the temperature coefficient, calculate the power data and its corresponding xenon temperature data, and generate a xenon correction dataset; The reference temperature curve is corrected based on the xenon correction dataset to generate a xenon correction curve.

5. The method for correcting the control rod calibration curve according to claim 4, characterized in that, The step of correcting the reference temperature curve based on the xenon correction dataset to generate a xenon correction curve includes: Obtain the power data and its corresponding xenon temperature data from the xenon correction dataset, and obtain the power data and its corresponding reference temperature data from the reference temperature curve; For each power data point, the sum of the corresponding xenon temperature data and the corresponding reference temperature data is calculated to generate the corresponding xenon corrected temperature data. Each power data point and its corresponding xenon correction temperature data are fitted to generate a xenon correction curve.

6. The method for correcting the control rod calibration curve according to claim 3, characterized in that, The step of calculating the overheating correction curve based on the set balance coefficient, the first-loop completely untracked curve, and the xenon correction curve includes: A loop-completely untracked curve is set based on the first temperature data in the reference temperature curve; Based on the set balance coefficient, the first-loop untracked curve, and the xenon correction curve, an overheating correction curve is generated.

7. The method for correcting the control rod calibration curve according to claim 6, characterized in that, The step of generating the overheating correction curve based on the set balance coefficient, the first-loop completely untracked curve, and the xenon correction curve includes: For each power data point, determine the constant temperature data of the untracked curve of the first loop and the xenon-corrected temperature data of the xenon-corrected curve; Based on the set balance coefficient, the constant temperature data, and the corresponding xenon correction temperature data, the overheat correction temperature data is calculated; wherein, under each power data, the difference between the constant temperature data and the overheat correction temperature data is recorded as the first temperature difference, and the difference between the overheat correction temperature data and the xenon correction temperature data is recorded as the second temperature difference, and the ratio of the first temperature difference to the corresponding second temperature difference is equal to the balance coefficient. For each power data point and its corresponding overheat correction temperature data, a fitting process is performed to generate an overheat correction curve.

8. The method for correcting the control rod calibration curve according to claim 1, characterized in that, The step of calculating the power data in the overheating correction curve and its corresponding overheating correction power data based on the overheating correction curve and the reference temperature curve, and generating an overheating correction parameter set includes: For each power data point, the difference between the overheat correction temperature data in the overheat correction curve and the reference temperature data in the reference temperature curve is calculated to generate temperature difference correction data. The temperature difference correction data corresponding to each power data is input into the reference temperature curve to calculate the corresponding overheat correction power data; A set of overheat correction parameters is generated based on each power data point and its corresponding overheat correction power data.

9. The method for correcting the control rod calibration curve according to claim 1, characterized in that, The step of correcting the control rod calibration curve according to the overheating correction parameter set to generate a corrected control rod calibration curve includes: For each power data point, the difference between the corresponding overheat correction power data and the corresponding initial correction power data in the control rod calibration curve is calculated to generate the target correction data. The control rod calibration curve represents the relationship between the power data and the control rod position, and each power data point in the control rod calibration curve corresponds to an initial correction power data point and a control rod position. The corresponding power data is corrected based on the target correction data to generate corrected power data. The corrected power data is fitted with the corresponding control rod position to generate a corrected control rod calibration curve.

10. A correction device for a control bar calibration curve, characterized in that, include: The data acquisition module is used to acquire a reference temperature profile during the load reduction period; The first correction module is used to correct the reference temperature curve based on the negative reactivity introduced by xenon, and generate a xenon correction curve. The second correction module is used to calculate the overheating correction curve based on the set balance coefficient, the first loop completely untracked curve, and the xenon correction curve. The data calculation module is used to calculate the power data in the overheating correction curve and its corresponding overheating correction power data based on the overheating correction curve and the reference temperature curve, and to generate an overheating correction parameter set. The third correction module is used to correct the control rod calibration curve according to the overheat correction parameter set and generate the corrected control rod calibration curve.

11. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes a computer program to implement the steps of the method for correcting the control bar calibration curve as described in any one of claims 1 to 9.

12. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the step of correcting the control bar calibration curve as described in any one of claims 1 to 9.

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