Parameter setting method and system for nuclear instrumentation system

Abstract

This invention relates to the field of commissioning of nuclear instruments outside the reactor in nuclear power plants, specifically to a parameter setting method and system for a nuclear instrumentation system. The method includes: acquiring the sensitivity of the source range and intermediate range detectors; determining the initial source range channel exit current threshold for the intermediate range measurement channel based on the ideal range overlap range; calculating the initial dimensional conversion coefficient and the final full-power output current; determining the final full-power output current based on preset current conditions; and determining the dimensional conversion coefficient and the source range channel exit current threshold of the nuclear instrumentation system based on the determination result, the initial source range channel exit current threshold, and the initial dimensional conversion coefficient. This invention establishes a quantitative relationship between the dimensional conversion coefficient and the source range channel exit current threshold. By matching the technical characteristics of different measurement channels, seamless channel switching and full-range monitoring of neutron flux can be achieved, improving the reliability and safety of the reactor nuclear instrumentation system.

Description

Technical Field

[0001] This invention relates to the field of commissioning of nuclear instruments outside the nuclear power plant reactor, and specifically to a parameter setting method and system for a nuclear instrument system. Background Technology

[0002] During the startup and operation of a nuclear power plant reactor, continuous monitoring of neutron flux at different power levels is required. The Intermediate Range (IR) and Source Range (SR) measurement channels are two important nuclear instrumentation channels, responsible for monitoring neutron flux across different ranges. The SR measurement channel outputs a count rate, characterizing the neutron flux level at low power; the IR measurement channel outputs a current, capable of measuring a wider range of neutron flux. To achieve smooth switching between the two measurement channels, an exit current threshold, known as the P6 setpoint, is typically set for the IR measurement channel. When the IR measurement channel current reaches the P6 setpoint, manual exit from the SR measurement channel is permitted. Simultaneously, to avoid frequent switching, a certain hysteresis is incorporated into the P6 setpoint; the value after hysteresis is called the P6 non-setpoint. The current signal of the reactor IR measurement channel is linked to the count rate signal through a dimensional conversion coefficient. Properly adjusting the dimensional conversion coefficient and the P6 setpoint is crucial for ensuring reliable switching of the measurement channel and monitoring of neutron flux across the full power range.

[0003] Currently, the setting of dimensional conversion coefficients and source range channel exit current thresholds mainly relies on empirical values, lacking systematic theoretical analysis and calculation methods. This empirical debugging method makes it difficult to accurately match the technical parameters of different measurement channels, which may lead to problems such as uneven channel switching and monitoring blind spots, thereby affecting the safe operation of the reactor. Summary of the Invention

[0004] To address the above problems, this invention provides a parameter setting method and system for a nuclear instrumentation system.

[0005] The first aspect of this invention discloses a parameter setting method for a nuclear instrumentation system, the nuclear instrumentation system including a source range detector and an intermediate range detector, the parameter setting method including:

[0006] Obtain the sensitivity of the source range detector and the intermediate range detector;

[0007] Based on the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel, the initial source range channel exit current threshold of the intermediate range measurement channel is determined.

[0008] Based on the initial source range channel exit current threshold and the sensitivity of the source range detector and the intermediate range detector, calculate the initial dimension conversion coefficient of the current and count rate of the intermediate range detector.

[0009] At full power of the reactor, the final output current of the intermediate range detector at full power is calculated based on the relationship function between the dimension conversion coefficient and the output current, according to the initial dimension conversion coefficient.

[0010] The final output current at full power is determined based on the preset current conditions, and the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system are determined based on the judgment result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient.

[0011] Furthermore, the step of determining the initial source range exit current threshold of the intermediate range measurement channel, based on the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel, includes:

[0012] Determine the right boundary value of the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel;

[0013] Use the right boundary value as the initial source range channel exit current threshold for the intermediate range measurement channel.

[0014] Furthermore, the initial dimensionless conversion coefficient k is calculated as follows:

[0015] k = C * k_s * P;

[0016] Where C is the preset first constant, k_s is the sensitivity ratio of the source range detector and the intermediate range detector, and P is the initial source range channel exit current threshold.

[0017] Furthermore, under full reactor power, the steps for calculating the final full-power output current of the intermediate-range detector based on the relationship function between the dimension conversion factor and the output current, according to the initial dimension conversion factor, include:

[0018] Calculate the raw output current at full power as measured by the intermediate range detector under full reactor power conditions;

[0019] Calculate the final full-power output current I based on the relationship function between the dimension conversion factor and the output current. DC :

[0020] I DC =I0*k DC *k;

[0021] Where I0 represents the full-power original output current, k DCdenoted by , represents the dimension conversion coefficient between current and count rate of the intermediate range detector in DC mode, and k represents the initial dimension conversion coefficient.

[0022] Furthermore, the steps of determining the final full-power output current based on preset current conditions, and determining the dimension conversion coefficients and source range channel exit current thresholds of the nuclear instrumentation system based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient include:

[0023] Determine the final full-power output current based on preset current conditions:

[0024] When the final output current at full power meets the preset current condition, the initial dimension conversion coefficient is used as the dimension conversion coefficient of the nuclear instrumentation system, and the initial source range channel exit current threshold is used as the source range channel exit current threshold of the nuclear instrumentation system.

[0025] If the final output current at full power does not meet the preset current condition, the initial dimension conversion coefficient and / or the initial source range channel exit current threshold will be adjusted until the recalculated final output current at full power meets the preset current condition.

[0026] Further steps, including adjusting the initial dimensionless conversion factor and / or the initial source range channel exit current threshold, include:

[0027] Keep the initial dimension conversion coefficient unchanged and lower the initial source range channel exit current threshold.

[0028] Further steps, including adjusting the initial dimensionless conversion factor and / or the initial source range channel exit current threshold, include:

[0029] Keep the initial source range channel exit current threshold unchanged and reduce the initial dimension conversion factor.

[0030] A second aspect of the present invention discloses a parameter setting system for a nuclear instrumentation system, comprising:

[0031] The first acquisition module is used to acquire the sensitivity of the source range detector and the intermediate range detector;

[0032] The first determining module is used to determine the initial source range channel exit current threshold of the intermediate range measurement channel based on the preset ideal range overlap range between the source range measurement channel and the intermediate range measurement channel of the reactor.

[0033] The first calculation module is used to calculate the initial dimensionless conversion coefficient of the current and count rate of the intermediate range detector based on the initial source range channel exit current threshold and the sensitivity of the source range detector and the intermediate range detector.

[0034] The second calculation module, under full power reactor conditions, calculates the final full-power output current of the intermediate range detector based on the relationship function between the dimension conversion coefficient and the output current, according to the initial dimension conversion coefficient.

[0035] The first judgment module is used to judge the final output current at full power based on the preset current conditions, and to determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system based on the judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient.

[0036] The third aspect of this invention discloses a parameter setting method for a nuclear instrumentation system, the nuclear instrumentation system including a source range detector and an intermediate range detector, the parameter setting method including:

[0037] Obtain the sensitivity of the source range detector and the intermediate range detector;

[0038] Based on the ideal output current of the intermediate range detector under full reactor power, and according to the relationship function between the dimension conversion coefficient and the output current, the initial dimension conversion coefficient of the current and the count rate of the intermediate range detector is determined.

[0039] Based on the initial dimension conversion coefficient and the sensitivity of the source range detector and the intermediate range detector, calculate the initial source range channel exit current threshold of the intermediate range measurement channel.

[0040] Based on the initial source range channel exit current threshold, determine the range overlap range between the source range measurement channel and the intermediate range measurement channel;

[0041] The range overlap range is determined based on the preset range overlap conditions, and the dimensional conversion coefficient and source range channel exit current threshold of the nuclear instrument system are determined based on the judgment result, the initial source range channel exit current threshold, and the initial dimensional conversion coefficient.

[0042] Furthermore, the initial dimensionless conversion coefficient k is calculated as follows:

[0043]

[0044] Among them, I ideal I0 represents the ideal output current, and I0 represents the raw output current at full power measured by the intermediate range detector under full reactor power conditions. k0 represents the ideal output current. DC This represents the dimension conversion factor between current and count rate of the intermediate range detector in DC mode.

[0045] Furthermore, the initial source range channel exit current threshold P is calculated as follows:

[0046]

[0047] Where C is the preset first constant, k_s is the sensitivity ratio of the source range detector and the intermediate range detector, and k is the initial dimension conversion coefficient.

[0048] Furthermore, the step of determining the range overlap range between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold includes:

[0049] The preset left boundary constant is used as the left boundary value of the range overlap range, and the initial source range channel exit current threshold is used as the right boundary value of the range overlap range.

[0050] Furthermore, the steps of determining the range overlap range based on preset range overlap conditions, and determining the dimension conversion coefficient and source range channel exit current threshold of the nuclear instrument system based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient include:

[0051] Determine the range overlap range based on preset range overlap conditions:

[0052] When the range overlap meets the preset range overlap condition, the initial dimension conversion coefficient is used as the dimension conversion coefficient of the nuclear instrument system, and the initial source range channel exit current threshold is used as the source range channel exit current threshold of the nuclear instrument system.

[0053] If the range overlap does not meet the preset range overlap condition, the initial dimension conversion coefficient and / or the initial source range channel exit current threshold are adjusted until the redefined range overlap meets the preset range overlap condition.

[0054] Further steps, including adjusting the initial dimensionless conversion factor and / or the initial source range channel exit current threshold, include:

[0055] Keep the initial dimension conversion coefficient unchanged and lower the initial source range channel exit current threshold.

[0056] Further steps, including adjusting the initial dimensionless conversion factor and / or the initial source range channel exit current threshold, include:

[0057] Keep the initial source range channel exit current threshold unchanged, and increase the initial dimension conversion coefficient.

[0058] Furthermore, based on the ideal output current of the intermediate-range detector at full reactor power, and according to the relationship function between the dimension conversion factor and the output current, the steps for determining the initial dimension conversion factor of the current and count rate of the intermediate-range detector include:

[0059] Calculate the initial dimensionless conversion factor k based on the relationship function between the dimensionless conversion factor and the output current:

[0060]

[0061] Among them, I ideal I0 represents the ideal output current of the intermediate-range detector at full reactor power, and I0 represents the original full-power output current measured by the intermediate-range detector at full reactor power. DC This represents the dimension conversion factor between current and count rate of the intermediate range detector in DC mode.

[0062] A fourth aspect of the present invention discloses a parameter setting system for a nuclear instrumentation system, comprising:

[0063] The second acquisition module is used to acquire the sensitivity of the source range detector and the intermediate range detector;

[0064] The second determining module is used to determine the initial dimensional conversion coefficients of the current and count rate of the intermediate range detector based on the ideal output current of the intermediate range detector under full power of the reactor and the relationship function between the dimensional conversion coefficient and the output current.

[0065] The third calculation module is used to calculate the initial source range channel exit current threshold of the intermediate range measurement channel based on the initial dimension conversion coefficient and the sensitivity of the source range detector and the intermediate range detector.

[0066] The third determining module is used to determine the range overlap range between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold.

[0067] The second judgment module is used to judge the range overlap range according to the preset range overlap conditions, and to determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to the judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient.

[0068] This invention proposes a method for comprehensively setting the dimension conversion coefficient and the source range channel exit current threshold. Compared with the traditional empirical debugging method, this method establishes a quantitative relationship between the dimension conversion coefficient and the source range channel exit current threshold. By matching the technical characteristics of different measurement channels, seamless channel switching and full-range monitoring of neutron flux can be achieved, thereby improving the reliability and safety of the reactor nuclear instrumentation system. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0070] Figure 1 This is a flowchart illustrating a parameter setting method for a nuclear instrumentation system disclosed in an embodiment of the present invention;

[0071] Figure 2 This is a schematic diagram of the structure of a parameter setting system for a nuclear instrumentation system disclosed in an embodiment of the present invention;

[0072] Figure 3 This is a flowchart illustrating another parameter setting method for a nuclear instrumentation system disclosed in an embodiment of the present invention;

[0073] Figure 4 This is a schematic diagram of the structure of another parameter setting system for a nuclear instrumentation system disclosed in an embodiment of the present invention. Detailed Implementation

[0074] To enable those skilled in the art to better understand the present invention, 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.

[0075] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, or product comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, apparatus, or products.

[0076] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0077] Please see Figure 1 As shown, Figure 1 This is a flowchart illustrating a parameter setting method for a nuclear instrumentation system disclosed in an embodiment of the present invention. The nuclear instrumentation system includes a source range detector and an intermediate range detector. Figure 1 As shown, the parameter setting method for this nuclear instrumentation system may include the following operations:

[0078] S101. Obtain the sensitivity of the source range detector and the intermediate range detector;

[0079] In this optional embodiment, the source range detector is a monitoring unit in the nuclear instrumentation system that uses a boron-coated proportional counter tube as the detector. During reactor shutdown and startup, it monitors the neutron flux level by outputting a count rate signal, and its sensitivity is expressed as the ratio of the count rate to the neutron flux. The intermediate range measurement channel uses a fission chamber detector, which achieves wide-range neutron flux monitoring during startup by using a count rate signal in pulse mode and a current signal in DC mode. Its sensitivity is characterized by the ratio of the count rate to the neutron flux in pulse mode and the ratio of the current to the neutron flux in DC mode, respectively. The two work together to ensure full-range monitoring of the reactor from shutdown to full-power operation.

[0080] S102. Based on the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel, determine the initial source range channel exit current threshold of the intermediate range measurement channel.

[0081] In an optional embodiment, the step of determining the initial source range exit current threshold of the intermediate range measurement channel based on the preset ideal range overlap range between the source range measurement channel and the intermediate range measurement channel of the reactor includes:

[0082] Determine the right boundary value of the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel;

[0083] Use the right boundary value as the initial source range channel exit current threshold for the intermediate range measurement channel.

[0084] In this optional embodiment, a preset empirical value is used as the left boundary value of the ideal range overlap range, and the right boundary value differs from the left boundary value by an order of magnitude. For example, the left boundary value is set to the empirical value 1E-11; the right boundary value is set to 10 times the left boundary value, i.e., 1E-10.

[0085] As can be seen, this optional embodiment directly uses the right boundary value of the preset ideal range overlap range as the initial source range channel exit current threshold, avoiding the problem of insufficient range overlap or excessive redundancy caused by setting thresholds based on human experience. This maintains the continuity of neutron flux monitoring during reactor start-up and shutdown, and reduces the risk of SR channel falsely triggering shutdown protection.

[0086] S103. Based on the initial source range channel exit current threshold and the sensitivity of the source range detector and the intermediate range detector, calculate the initial dimension conversion coefficient of the current and count rate of the intermediate range detector.

[0087] In an optional embodiment, the initial dimensionless conversion coefficient k is calculated as follows:

[0088] k = C * k_s * P;

[0089] Where C is the preset first constant, k_s is the sensitivity ratio of the source range detector and the intermediate range detector, and P is the initial source range channel exit current threshold.

[0090] In this optional embodiment, Where 'a' represents the ideal ratio of the non-fixed value of P6 to the exit current threshold of the source range channel, which is a preset value, and P0 is the preset shutdown protection setting value of the SR channel.

[0091] As can be seen, this optional embodiment expresses the initial dimensional conversion coefficient k as the product of a preset constant C, the sensitivity ratio k_s, and the initial source range channel exit current threshold. This systematically links the sensitivity difference between the SR and IR detectors, the threshold setting, and the conversion coefficient, ensuring a strict match between the dimensional conversion coefficient and the physical characteristics of the detector. This allows the parameter setting to break free from the limitations of single empirical adjustments, improves the scientific nature of the calculation results and the global optimality of the parameter combination, and avoids signal mismatch between channels due to sensitivity changes.

[0092] S104. At full power of the reactor, based on the relationship function between the dimension conversion coefficient and the output current, calculate the final output current of the intermediate range detector at full power according to the initial dimension conversion coefficient.

[0093] In an optional embodiment, the step of calculating the final full-power output current of the intermediate-range detector based on the relationship function between the dimension conversion factor and the output current at full reactor power includes:

[0094] Calculate the raw output current at full power as measured by the intermediate range detector under full reactor power conditions;

[0095] Calculate the final full-power output current I based on the relationship function between the dimension conversion factor and the output current. DC :

[0096] I DC =I0*k DC *k;

[0097] Where I0 represents the full-power original output current, k DC denoted by , represents the dimension conversion coefficient between current and count rate of the intermediate range detector in DC mode, and k represents the initial dimension conversion coefficient.

[0098] In this optional embodiment, in the intermediate range measurement channel, DC mode is the operating mode used by the fission chamber detector at high neutron flux levels (such as full power operation). When the reactor power increases to a point where pulse mode cannot effectively distinguish individual fission events, the IR detector switches to DC mode to directly characterize the neutron flux by measuring the continuous ionization current generated by the fission material. In this mode, the raw current needs to undergo two dimension conversions: first through k... DC The original full-power output current is converted into an equivalent counting rate, and then converted into the final output current through a dimensional conversion factor.

[0099] As can be seen, in this optional embodiment, the full-power current is calculated based on the formula of DC mode. Through the dual constraints of physical characteristics and preset coefficients, it is ensured that the IR channel can cover the wide range measurement requirements at full power, while avoiding monitoring failure due to current signal saturation. This ensures the accuracy of neutron flux data in the high-power range and the system safety boundary.

[0100] S105. Determine the final output current at full power based on the preset current conditions, and determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system based on the judgment result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient.

[0101] In an optional embodiment, the steps of determining the final full-power output current based on preset current conditions, and determining the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrumentation system based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient include:

[0102] Determine the final full-power output current based on preset current conditions:

[0103] When the final output current at full power meets the preset current condition, the initial dimension conversion coefficient is used as the dimension conversion coefficient of the nuclear instrumentation system, and the initial source range channel exit current threshold is used as the source range channel exit current threshold of the nuclear instrumentation system.

[0104] If the final output current at full power does not meet the preset current condition, the initial dimension conversion coefficient and / or the initial source range channel exit current threshold will be adjusted until the recalculated final output current at full power meets the preset current condition.

[0105] In an optional embodiment, the preset current condition refers to the intermediate range measurement channel not being saturated under full power, that is, the output current of the intermediate range detector in DC mode is less than the preset current value, such as 9E-4 amps.

[0106] As can be seen, this optional embodiment performs closed-loop verification of the final output current at full power using preset current conditions, and dynamically adjusts the dimension conversion coefficient or exits the current threshold based on the verification results. This method achieves adaptive parameter setting: when the full power current exceeds the limit, the parameters are readjusted to balance the overlap requirements of the range and the full power monitoring limit; when the current is compliant, the optimal parameter combination is directly locked. This mechanism effectively solves the problem of poor adaptability to operating conditions caused by the rigidity of parameters in traditional experience-based adjustments, ensuring that the SR / IR channel parameters meet the dual constraints of "sufficient overlap range" and "unsaturated full power" under any sensitivity combination, thereby improving system robustness.

[0107] In an optional embodiment, the steps of adjusting the initial dimension conversion factor and / or the initial source range channel exit current threshold include:

[0108] Keep the initial dimension conversion coefficient unchanged and lower the initial source range channel exit current threshold.

[0109] As can be seen, this optional embodiment, by maintaining the initial dimensional conversion coefficient unchanged and only reducing the initial source range channel exit current threshold, prioritizes sacrificing the right-hand side of the overlapping region to meet the full-power current limit while maintaining the matching relationship between the SR / IR sensitivity ratio and the conversion coefficient. This choice avoids signal chain logic conflicts that may arise from simultaneously adjusting multiple parameters in engineering. Furthermore, the reduction in the initial source range channel exit current threshold directly narrows the flux window at SR exit, further reducing the probability of SR false triggering of reactor shutdown. Simultaneously, the impact of reducing the rightward shift of the overlapping range on monitoring continuity is controllable, balancing safety and adjustment efficiency.

[0110] In an optional embodiment, the steps of adjusting the initial dimension conversion factor and / or the initial source range channel exit current threshold include:

[0111] Keep the initial source range channel exit current threshold unchanged and reduce the initial dimension conversion factor.

[0112] By maintaining the initial source range channel exit current threshold unchanged and only reducing the initial dimension conversion coefficient, this method directly suppresses the final output current of the IR channel by reducing the initial dimension conversion coefficient, ensuring that it meets the full-power unsaturation condition, while maintaining the stability of the SR exit flux window. Since reducing the initial dimension conversion coefficient is equivalent to compressing the current signal range of the IR channel, but the fixed initial source range channel exit current threshold ensures that the triggering timing of the SR exit logic remains unchanged, this adjustment, while preserving the left end range of range overlap, prioritizes full-power monitoring effectiveness through signal scaling. It is suitable for scenarios with stringent requirements for the stability of the SR exit timing and avoids the cascading effects of threshold changes on the start-stop logic.

[0113] Please see Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a parameter setting system for a nuclear instrumentation system disclosed in an embodiment of the present invention, comprising:

[0114] The first acquisition module 201 is used to acquire the sensitivity of the source range detector and the intermediate range detector;

[0115] The first determining module 202 is used to determine the initial source range channel exit current threshold of the intermediate range measurement channel based on the preset ideal range overlap range between the source range measurement channel and the intermediate range measurement channel of the reactor.

[0116] The first calculation module 203 is used to calculate the initial dimension conversion coefficient of the current and count rate of the intermediate range detector based on the initial source range channel exit current threshold and the sensitivity of the source range detector and the intermediate range detector.

[0117] The second calculation module 204 calculates the final output current of the intermediate range detector at full power under full reactor power based on the relationship function between the dimension conversion coefficient and the output current, according to the initial dimension conversion coefficient.

[0118] The first judgment module 205 is used to judge the final output current at full power according to the preset current conditions, and to determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to the judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient.

[0119] Specific limitations regarding the parameter setting system of the nuclear instrumentation system can be found in the limitations on the parameter setting method of the nuclear instrumentation system mentioned above, and will not be repeated here. Each module in the parameter setting system of the aforementioned nuclear instrumentation system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware format or independent of the processor, or stored in the memory of the electronic device in software format, so that the processor can call the corresponding operations of each module.

[0120] It should be noted that, in order to highlight the innovative aspects of this invention, this embodiment does not include modules that are not closely related to solving the technical problems proposed by this invention, but this does not mean that there are no other modules in this embodiment.

[0121] Please see Figure 3 As shown, Figure 3 This is a flowchart illustrating another parameter setting method for a nuclear instrumentation system disclosed in an embodiment of the present invention. The nuclear instrumentation system includes a source range detector and an intermediate range detector. Figure 3 As shown, the parameter setting method for this nuclear instrumentation system may include the following operations:

[0122] S301. Obtain the sensitivity of the source range detector and the intermediate range detector;

[0123] S302. Based on the ideal output current of the intermediate range detector under full reactor power, and according to the relationship function between the dimensional conversion coefficient and the output current, determine the initial dimensional conversion coefficient between the current and the count rate of the intermediate range detector.

[0124] In an optional embodiment, the step of determining the initial dimensionless conversion coefficients of the intermediate-range detector's current and count rate based on the ideal output current of the intermediate-range detector at full reactor power, according to the relationship function between the dimensionless conversion coefficients and the output current, includes:

[0125] Calculate the initial dimensionless conversion factor based on the relationship function between the dimensionless conversion factor and the output current:

[0126]

[0127] Among them, I ideal I0 represents the ideal output current, and I0 represents the raw output current at full power measured by the intermediate range detector under full reactor power conditions. k0 represents the ideal output current. DC This represents the dimension conversion factor between current and count rate of the intermediate range detector in DC mode.

[0128] As can be seen, this optional embodiment defines the initial dimension conversion coefficient k as the ratio of the ideal output current to the full-power original output current and the DC mode dimension conversion coefficient. This directly links the ideal current requirement under full-power conditions to the detector's original signal characteristics and conversion coefficient, ensuring that the IR channel's output current is strictly controlled within a preset safety threshold at full power. This avoids monitoring failure due to signal saturation and ensures that the calculation process is consistent with the detector's actual performance through physical measurement data of the full-power original output current and the DC mode dimension conversion coefficient. This overcomes the risk of exceeding the full-power current limit that may exist when setting the initial dimension conversion coefficient based on traditional experience, and improves the scientific nature and adaptability of parameter settings.

[0129] S303. Calculate the initial source range channel exit current threshold of the intermediate range measurement channel based on the initial dimension conversion coefficient, the sensitivity of the source range detector and the intermediate range detector.

[0130] In an optional embodiment, the initial source range channel exit current threshold P is calculated as follows:

[0131]

[0132] Where C is the preset first constant, k_s is the sensitivity ratio of the source range detector and the intermediate range detector, and k is the initial dimension conversion coefficient.

[0133] As can be seen, this optional embodiment systematically associates the initial source range channel exit current threshold with the initial dimension conversion coefficient, sensitivity ratio, and preset constant C. This ensures that the calculation process of the initial source range channel exit current threshold takes into account the sensitivity differences of the SR / IR detectors and the dimension conversion logic. This makes the setting of the exit threshold no longer an isolated adjustment, but forms a closed loop with the full-power current constraint. This avoids the problem of insufficient range overlap or excessive redundancy that may be caused by manually setting the initial source range channel exit current threshold based on experience. It ensures the global optimality of the parameter combination and improves system safety and the monitoring continuity of the reactor start-up and shutdown process.

[0134] S304. Determine the range overlap range between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold.

[0135] In an optional embodiment, the step of determining the range overlap range between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold includes:

[0136] The preset left boundary constant is used as the left boundary value of the range overlap range, and the initial source range channel exit current threshold is used as the right boundary value of the range overlap range.

[0137] As can be seen, this optional embodiment, by using a preset left boundary constant as the left end of the range overlap range and the initial source range channel exit current threshold as the right end, forces the right boundary of the range overlap range to be strictly aligned with the exit threshold of the IR channel. This ensures that the SR / IR channel has continuous monitoring capability between the preset minimum neutron flux level (left boundary) and the flux level at which the IR is allowed to exit the SR (right boundary). Furthermore, by binding the right boundary with the initial source range channel exit current threshold, the width of the range overlap range is directly controlled by the rationality of the IR exit logic. This avoids the monitoring blind spots or logic conflicts that may occur due to the independent setting of the left and right boundaries of the overlap range in traditional methods, and enhances the systematic nature of parameter setting and the reliability of neutron flux monitoring.

[0138] S305. Determine the range overlap range based on the preset range overlap conditions, and determine the dimension conversion coefficient and source range channel exit current threshold of the nuclear instrument system based on the judgment result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient.

[0139] In an optional embodiment, the steps of determining the range overlap range based on a preset range overlap condition, and determining the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient include:

[0140] Determine the range overlap range based on preset range overlap conditions:

[0141] When the range overlap meets the preset range overlap condition, the initial dimension conversion coefficient is used as the dimension conversion coefficient of the nuclear instrument system, and the initial source range channel exit current threshold is used as the source range channel exit current threshold of the nuclear instrument system.

[0142] If the range overlap does not meet the preset range overlap condition, the initial dimension conversion coefficient and / or the initial source range channel exit current threshold are adjusted until the redefined range overlap meets the preset range overlap condition.

[0143] In this optional embodiment, the range overlap condition refers to the difference between the left and right boundaries of the range overlap being more than one order of magnitude.

[0144] As can be seen, this optional embodiment verifies the calculated range overlap range by setting preset range overlap conditions, and dynamically adjusts the dimension conversion coefficient or the initial source range channel exit current threshold according to the verification results. This method achieves bidirectional optimization of parameter settings: when the overlap range is insufficient, the right boundary is expanded or the left boundary is compressed by adjusting the initial dimension conversion coefficient or the initial source range channel exit current threshold to ensure the monitoring continuity of the SR / IR channel; when the overlap range is compliant, the parameter combination is directly locked. This mechanism incorporates the full-power current limit and range overlap requirement into a unified decision-making framework, solving the problem of difficulty in balancing the two when they conflict in traditional methods. Through closed-loop feedback, it ensures that the parameters meet the dual requirements of "sufficient range coverage" and "full-power safety" under any operating condition, improving system robustness and parameter adaptation efficiency.

[0145] In an optional embodiment, the steps of adjusting the initial dimension conversion factor and / or the initial source range channel exit current threshold include:

[0146] Keep the initial dimension conversion coefficient unchanged and lower the initial source range channel exit current threshold.

[0147] As can be seen, this optional embodiment, by maintaining the initial dimension conversion coefficient unchanged and only reducing the initial source range channel exit current threshold, satisfies the range overlap condition by narrowing the right boundary of the range overlap range (i.e., the initial source range channel exit current threshold) while maintaining the full-power current constraint. Since the dimension conversion coefficient remains unchanged, it means that the compliance of the full-power output current of the IR channel is ensured. Although reducing the initial source range channel exit current threshold sacrifices part of the right end of the overlap range, it further reduces the probability of SR falsely triggering reactor shutdown protection by forcing SR to exit at a lower flux level. At the same time, since the left boundary is fixed, the minimum overlap monitoring requirement can still be guaranteed. This method is suitable for scenarios with strict full-power current restrictions but high tolerance for range overlap, achieving a controllable balance between safety and monitoring continuity.

[0148] In an optional embodiment, the steps of adjusting the initial dimension conversion factor and / or the initial source range channel exit current threshold include:

[0149] Keep the initial source range channel exit current threshold unchanged, and increase the initial dimension conversion coefficient.

[0150] As can be seen, this optional embodiment, by maintaining the initial source range channel exit current threshold unchanged and only increasing the initial dimension conversion coefficient, expands the output current range of the IR channel by increasing the dimension conversion coefficient while maintaining the stability of the SR exit logic triggering timing. This indirectly extends the right end of the range overlap range (since the initial source range channel exit current threshold is fixed and the right boundary remains unchanged, but increasing the dimension conversion coefficient can improve the IR current output at the same flux, which is equivalent to covering a higher neutron flux level under a fixed initial source range channel exit current threshold). This adjustment avoids interference from changes in the initial source range channel exit current threshold on the reactor start-up and shutdown logic, and enhances the signal resolution of the IR channel in the high flux region through dimension conversion coefficient optimization. It is particularly suitable for scenarios with stringent requirements for SR exit timing stability and the need to expand high flux monitoring capabilities, achieving a targeted improvement in system monitoring performance through parameter adjustment.

[0151] Please see Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of another parameter setting system for a nuclear instrumentation system disclosed in an embodiment of the present invention, including:

[0152] The second acquisition module 401 is used to acquire the sensitivity of the source range detector and the intermediate range detector.

[0153] The second determining module 402 is used to determine the initial dimensional conversion coefficient between the current and the count rate of the intermediate range detector based on the ideal output current of the intermediate range detector under full power of the reactor and the relationship function between the dimensional conversion coefficient and the output current.

[0154] The third calculation module 403 is used to calculate the initial source range channel exit current threshold of the intermediate range measurement channel based on the initial dimension conversion coefficient and the sensitivity of the source range detector and the intermediate range detector.

[0155] The third determining module 404 is used to determine the range overlap range between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold.

[0156] The second judgment module 405 is used to judge the range overlap range according to the preset range overlap conditions, and to determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to the judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient.

[0157] Specific limitations regarding the parameter setting system of the nuclear instrumentation system can be found in the limitations on the parameter setting method of the nuclear instrumentation system mentioned above, and will not be repeated here. Each module in the parameter setting system of the aforementioned nuclear instrumentation system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware format or independent of the processor, or stored in the memory of the electronic device in software format, so that the processor can call the corresponding operations of each module.

[0158] It should be noted that, in order to highlight the innovative aspects of this invention, this embodiment does not include modules that are not closely related to solving the technical problems proposed by this invention, but this does not mean that there are no other modules in this embodiment.

[0159] In summary, the parameter setting method and system for a nuclear instrumentation system disclosed in this invention establishes a quantitative relationship between the dimensional conversion coefficient and the source range channel exit current threshold. By matching the technical characteristics of different measurement channels, seamless channel switching and full-range monitoring of neutron flux can be achieved, improving the reliability and safety of the reactor nuclear instrumentation system. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0160] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A parameter setting method for a nuclear instrumentation system, characterized in that, The nuclear instrumentation system includes a source range detector and an intermediate range detector, and the parameter setting method includes: Obtain the sensitivity of the source range detector and the intermediate range detector; Based on the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel, the initial source range channel exit current threshold of the intermediate range measurement channel is determined. Based on the initial source range channel exit current threshold and the sensitivity of the source range detector and the intermediate range detector, calculate the initial dimensionless conversion coefficients of the current and count rate of the intermediate range detector, wherein the initial dimensionless conversion coefficients... It was obtained by calculation as follows: , As the preset first constant, The sensitivity of the source range detector and the intermediate range detector. The initial source range channel exit current threshold; At full power of the reactor, the final full-power output current of the intermediate range detector is calculated based on the relationship function between the dimension conversion coefficient and the output current, according to the initial dimension conversion coefficient. The final output current at full power is determined based on the preset current conditions, and the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system are determined based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient.

2. The parameter setting method for a nuclear instrumentation system according to claim 1, characterized in that, The step of determining the initial source range exit current threshold of the intermediate range measurement channel, based on the preset ideal range overlap range between the source range measurement channel and the intermediate range measurement channel of the reactor, includes: Determine the right boundary value of the preset ideal range overlap range between the reactor's source range measurement channel and the reactor's intermediate range measurement channel; The right boundary value is used as the initial source range channel exit current threshold of the intermediate range measurement channel.

3. The parameter setting method for a nuclear instrumentation system according to claim 1, characterized in that, At full reactor power, the steps for calculating the final full-power output current of the intermediate range detector based on the relationship function between the dimension conversion factor and the output current, according to the initial dimension conversion factor, include: Calculate the raw output current at full power as measured by the intermediate range detector when the reactor is at full power. Calculate the final full-power output current based on the relationship function between the dimension conversion factor and the output current. : ； in, This represents the original output current at full power. This represents the dimension conversion factor between the current and the count rate of the intermediate range detector in DC mode. This represents the initial dimension conversion coefficient.

4. The parameter setting method for a nuclear instrumentation system according to claim 1, characterized in that, The steps of determining the full-power final output current based on preset current conditions, and determining the dimension conversion coefficient and source range channel exit current threshold of the nuclear instrumentation system based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient include: The final output current at full power is determined based on preset current conditions: When the full-power final output current meets the preset current condition, the initial dimension conversion coefficient is used as the dimension conversion coefficient of the nuclear instrumentation system, and the initial source range channel exit current threshold is used as the source range channel exit current threshold of the nuclear instrumentation system. If the final output current at full power does not meet the preset current condition, the initial dimension conversion coefficient and / or the initial source range channel exit current threshold are adjusted until the recalculated final output current at full power meets the preset current condition.

5. The parameter setting method for a nuclear instrumentation system according to claim 4, characterized in that, The steps of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold include: Keeping the initial dimension conversion coefficient unchanged, the initial source range channel exit current threshold is reduced.

6. The parameter setting method for a nuclear instrumentation system according to claim 4, characterized in that, The steps of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold include: Keep the initial source range channel exit current threshold unchanged, and reduce the initial dimension conversion coefficient.

7. A parameter setting system for a nuclear instrumentation system, characterized in that, include: The first acquisition module is used to acquire the sensitivity of the source range detector and the intermediate range detector; The first determining module is used to determine the initial source range channel exit current threshold of the intermediate range measurement channel based on the preset ideal range overlap range between the source range measurement channel and the intermediate range measurement channel of the reactor. The first calculation module is used to calculate the initial dimensionless conversion coefficients of the current and count rate of the intermediate range detector based on the initial source range channel exit current threshold and the sensitivity of the source range detector and the intermediate range detector. The initial dimensionless conversion coefficients are... It was obtained by calculation as follows: , As the preset first constant, The sensitivity of the source range detector and the intermediate range detector. The initial source range channel exit current threshold; The second calculation module, under full power reactor conditions, calculates the final full-power output current of the intermediate range detector based on the relationship function between the dimension conversion coefficient and the output current, according to the initial dimension conversion coefficient. The first judgment module is used to judge the final output current of the full power according to the preset current conditions, and to determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to the judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient.

8. A parameter setting method for a nuclear instrumentation system, characterized in that, The nuclear instrumentation system includes a source range detector and an intermediate range detector, and the parameter setting method includes: Obtain the sensitivity of the source range detector and the intermediate range detector; Based on the ideal output current of the intermediate range detector at full reactor power, and according to the relationship function between the dimension conversion coefficient and the output current, the initial dimension conversion coefficient of the current and the count rate of the intermediate range detector is determined. Based on the initial dimensionless conversion coefficient and the sensitivity of the source range detector and the intermediate range detector, the initial source range channel exit current threshold of the intermediate range measurement channel is calculated, wherein the initial source range channel exit current threshold... It was obtained by calculation as follows: , As the preset first constant, The sensitivity of the source range detector and the intermediate range detector. These are the initial dimension conversion coefficients; Based on the initial source range channel exit current threshold, determine the range overlap range between the source range measurement channel and the intermediate range measurement channel; The range overlap range is determined according to the preset range overlap condition, and the dimensional conversion coefficient and the source range channel exit current threshold of the nuclear instrument system are determined according to the judgment result, the initial source range channel exit current threshold and the initial dimensional conversion coefficient.

9. A parameter setting method for a nuclear instrumentation system according to claim 8, characterized in that, The initial dimensionless conversion coefficient It was obtained by calculation as follows: ； in, This represents the ideal output current. This represents the raw output current at full power, measured by the intermediate-range detector, when the reactor is at full power. This represents the dimension conversion coefficient between the current and the count rate of the intermediate range detector in DC mode.

10. A parameter setting method for a nuclear instrumentation system according to claim 8, characterized in that, The steps for determining the range overlap between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold include: A preset left boundary constant is used as the left boundary value of the range overlap range, and the initial source range channel exit current threshold is used as the right boundary value of the range overlap range.

11. A parameter setting method for a nuclear instrumentation system according to claim 8, characterized in that, The steps of determining the range overlap range based on preset range overlap conditions, and determining the dimension conversion coefficient and source range channel exit current threshold of the nuclear instrument system based on the determination result, the initial source range channel exit current threshold, and the initial dimension conversion coefficient include: The range overlap range is determined based on preset range overlap conditions: When the range overlap range meets the preset range overlap condition, the initial dimension conversion coefficient is used as the dimension conversion coefficient of the nuclear instrument system, and the initial source range channel exit current threshold is used as the source range channel exit current threshold of the nuclear instrument system. When the range overlap does not meet the preset range overlap condition, the initial dimension conversion coefficient and / or the initial source range channel exit current threshold are adjusted until the redefined range overlap meets the preset range overlap condition.

12. The parameter setting method for a nuclear instrumentation system according to claim 11, characterized in that, The steps of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold include: Keeping the initial dimension conversion coefficient unchanged, the initial source range channel exit current threshold is reduced.

13. The parameter setting method for a nuclear instrumentation system according to claim 11, characterized in that, The steps of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold include: Keep the initial source range channel exit current threshold unchanged, and increase the initial dimension conversion coefficient.

14. The parameter setting method for a nuclear instrumentation system according to claim 8, characterized in that, Based on the ideal output current of the intermediate-range detector at full reactor power, and according to the relationship function between the dimension conversion factor and the output current, the steps for determining the initial dimension conversion factor of the current and the count rate of the intermediate-range detector include: Calculate the initial dimensionless conversion factor based on the relationship function between the dimensionless conversion factor and the output current. : ； in, This represents the ideal output current of the intermediate-range detector at full reactor power. This represents the raw output current at full power, measured by the intermediate-range detector, when the reactor is at full power. This represents the dimension conversion factor between current and count rate of the intermediate range detector in DC mode.

15. A parameter setting system for a nuclear instrumentation system, characterized in that, include: The second acquisition module is used to acquire the sensitivity of the source range detector and the intermediate range detector; The second determining module is used to determine the initial dimensional conversion coefficient between the current and the count rate of the intermediate range detector based on the ideal output current of the intermediate range detector under full reactor power and according to the relationship function between the dimensional conversion coefficient and the output current. The third calculation module is used to calculate the initial source range channel exit current threshold of the intermediate range measurement channel based on the initial dimension conversion coefficient and the sensitivity of the source range detector and the intermediate range detector. It was obtained by calculation as follows: , As the preset first constant, The sensitivity of the source range detector and the intermediate range detector. These are the initial dimension conversion coefficients; The third determining module is used to determine the range overlap range between the source range measurement channel and the intermediate range measurement channel based on the initial source range channel exit current threshold. The second judgment module is used to judge the range overlap range according to the preset range overlap condition, and to determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to the judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient.

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