Parameter setting method and system of nuclear instrumentation system

Abstract

The invention relates to the field of nuclear power plant ex-core nuclear instrument debugging, in particular to a parameter setting method and system of a nuclear instrument system, and the method comprises the steps: obtaining the sensitivity of a source range and an intermediate range detector, and determining an initial source range channel exit current threshold of an intermediate range measurement channel according to an ideal range overlapping range; and calculating an initial dimension conversion coefficient and a full-power final output current, judging the full-power final output current according to a preset current condition, and determining a dimension conversion coefficient and a source range channel exit current threshold of the nuclear instrumentation system according to a judgment result, the initial source range channel exit current threshold and the initial dimension conversion coefficient. According to the method, the quantitative relation between the dimension conversion coefficient and the exit current threshold value of the source range channel is established, seamless switching of the channels and full-range monitoring of neutron flux can be achieved by matching the technical characteristics of different measurement channels, and the reliability and safety of a reactor nuclear instrumentation system are improved.

Description

Technical Field

[0001] The present invention relates to the field of debugging of nuclear instruments outside a nuclear power plant, and in particular to a parameter setting method and system for a nuclear instrument system. Background Art

[0002] During the startup and operation of a nuclear power plant reactor, continuous monitoring of neutron flux at different power levels is required. The reactor's intermediate range (IR) measurement channel and the reactor's source range (SR) measurement channel are two important nuclear instrumentation measurement channels, each responsible for monitoring neutron flux within different ranges. The output signal of the reactor's SR measurement channel is a count rate, representing the neutron flux level at low power levels; the output signal of the reactor's IR measurement channel is a current, capable of measuring a wider range of neutron flux. To achieve smooth switching between the two measurement channels, the industry typically sets a source range channel exit current threshold, known as the P6 fixed value, in the reactor's IR measurement channel. When the reactor's IR measurement channel current reaches the P6 fixed value, manual exit from the reactor's SR measurement channel is permitted. Furthermore, to avoid frequent switching, a hysteresis is set for the P6 fixed value; the value after the hysteresis is known as the P6 non-fixed value. The current signal of the reactor IR measurement channel is linked to the count rate signal through a dimension conversion coefficient. Reasonable adjustment of the dimension conversion coefficient and P6 constant is crucial to ensure reliable switching of the measurement channel and neutron flux monitoring in the full power range.

[0003] Currently, the setting of dimension conversion coefficients and source range channel exit current thresholds relies primarily on empirical values, lacking systematic theoretical analysis and calculation methods. This empirical debugging approach makes it difficult to accurately match the technical parameters of different measurement channels, potentially leading to problems such as uneven channel switching and monitoring blind spots, which in turn affect the safe operation of the reactor. Summary of the Invention

[0004] To solve the above problems, the present invention provides a parameter setting method and system for a nuclear instrument system.

[0005] A first aspect of the present invention discloses a parameter setting method for a nuclear instrument system, wherein the nuclear instrument system includes a source range detector and an intermediate range detector. The parameter setting method includes:

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

[0007] Determining an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor;

[0008] Calculate the initial dimension conversion coefficient between the current and the count rate of the intermediate range detector based on the initial source range channel exit current threshold, the sensitivity of the source range detector and the intermediate range detector;

[0009] Under full reactor power, the final full power output current of the intermediate range detector is calculated based on the relationship function between the dimensional conversion coefficient and the output current and the initial dimensional conversion coefficient;

[0010] The final full-power output current is judged according to the preset current condition, and the dimension conversion coefficient and 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 dimension conversion coefficient.

[0011] Furthermore, the step of determining an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor includes:

[0012] Determining a right boundary value of a preset ideal range overlap range between a source range measurement channel of the reactor and an intermediate range measurement channel of the reactor;

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

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

[0015] k=C*k_s*P;

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

[0017] Furthermore, at full reactor power, the step of calculating the full-power final output current of the intermediate-range detector according to the initial dimensional conversion coefficient based on the relationship function between the dimensional conversion coefficient and the output current includes:

[0018] Calculate the full-power raw output current measured by the mid-range detector at full reactor power;

[0019] According to the relationship function between the dimension conversion coefficient and the output current, calculate the full power final output current I DC :

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

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

[0022] Furthermore, the steps of judging the final full-power output current according to the preset current condition, and determining 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 include:

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

[0024] When the final full-power output current meets the preset current 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;

[0025] When the full-power final output current 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 full-power final output current meets the preset current condition.

[0026] Furthermore, the step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold includes:

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

[0028] Furthermore, the step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold includes:

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

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

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

[0032] A first determining module is configured to determine an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor;

[0033] A first calculation module is used to calculate an 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, the sensitivity of the source range detector and the intermediate range detector;

[0034] The second calculation module calculates the full-power final output current of the intermediate-range detector according to the initial dimensional conversion coefficient based on the relationship function between the dimensional conversion coefficient and the output current at full reactor power;

[0035] The first judgment module is used to judge the final output current at full power according to the preset current condition, and determine the dimension conversion coefficient and 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.

[0036] A third aspect of the present invention discloses a parameter setting method for a nuclear instrument system, wherein the nuclear instrument system includes a source range detector and an intermediate range detector. The parameter setting method includes:

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

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

[0039] Calculate the initial source range channel exit current threshold of the intermediate range measurement channel based on the initial dimension conversion coefficient, the sensitivities of the source range detector and the intermediate range detector;

[0040] Determine the range overlap between the source range measurement channel and the intermediate range measurement channel according to the initial source range channel exit current threshold;

[0041] The range overlap range is judged according to the preset range overlap condition, and the dimension conversion coefficient and 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 dimension conversion coefficient.

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

[0043]

[0044] Among them, I ideal represents the ideal output current, I0 represents the full-power original output current measured by the mid-range detector at full reactor power, and k DC Indicates the dimension conversion factor between current and count rate for mid-range detectors in DC mode.

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

[0046]

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

[0048] Furthermore, the step of determining the range overlap between the source range measurement channel and the intermediate range measurement channel according to 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 judging the range overlap range according to the preset range overlap condition, and determining 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 include:

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

[0052] 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;

[0053] When the range overlap range 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 re-determined range overlap range meets the preset range overlap condition.

[0054] Furthermore, the step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold includes:

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

[0056] Furthermore, the step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold includes:

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

[0058] Furthermore, the step of determining an initial dimensional conversion coefficient between the current and the count rate of the intermediate range detector according to an ideal output current of the intermediate range detector at full reactor power and a relationship function between the dimensional conversion coefficient and the output current includes:

[0059] According to the relationship function between the dimension conversion coefficient and the output current, the initial dimension conversion coefficient k is calculated:

[0060]

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

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

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

[0064] The second determination module is used to determine the initial dimension conversion coefficient of the current and count rate of the intermediate range detector according to the ideal output current of the intermediate range detector at full power of the reactor and the relationship function between the dimension conversion coefficient and the output current;

[0065] a third calculation module, configured to calculate an initial source range channel exit current threshold of the intermediate range measurement channel according to the initial dimension conversion coefficient, the sensitivities of the source range detector and the intermediate range detector;

[0066] A third determining module is configured to determine a range overlap between the source range measurement channel and the intermediate range measurement channel according to an 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 condition, and determine the dimension conversion coefficient and 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] The present 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 instrument system. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0070] Figure 1 This is a flow chart of a parameter setting method for a nuclear instrument 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 instrument system disclosed in an embodiment of the present invention;

[0072] Figure 3 This is a flow chart of another method for setting parameters of a nuclear instrument system disclosed in an embodiment of the present invention;

[0073] Figure 4 It is a structural diagram of another parameter setting system of a nuclear instrument system disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0075] The terms "first," "second," and so on, in the description and claims of the present invention and the accompanying drawings are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, or product comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, apparatus, or product.

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

[0077] See also Figure 1 As shown, Figure 1 This is a flow chart of a parameter setting method for a nuclear instrument system disclosed in an embodiment of the present invention. The nuclear instrument system includes a source range detector and an intermediate range detector. Figure 1 As shown, the parameter setting method of the nuclear instrument system may include the following operations:

[0078] S101, obtaining 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 instrument system that uses a boron-coated proportional counter tube as a detector. It monitors the neutron flux level by outputting a count rate signal during reactor shutdown and startup, and its sensitivity is expressed as the ratio of count rate to neutron flux; while the intermediate range measurement channel uses a fission chamber detector. During the startup process, it realizes wide-range neutron flux monitoring through the count rate signal in pulse mode and the current signal in DC mode. Its sensitivity is characterized by the ratio of pulse mode count rate to neutron flux and the ratio of DC mode current to neutron flux, respectively. The two work together to ensure full-range monitoring of the reactor from shutdown to full-power operation.

[0080] S102, determining an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor;

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

[0082] Determining a right boundary value of a preset ideal range overlap range between a source range measurement channel of the reactor and an intermediate range measurement channel of the reactor;

[0083] Use the right boundary value as the initial source range channel exit current threshold for the mid-scale 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 one 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, that is, 1E-10.

[0085] It can be seen that 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, thereby avoiding the problem of insufficient range overlap or excessive redundancy caused by artificial experience in setting the threshold, thereby maintaining the continuity of neutron flux monitoring during the reactor startup and shutdown process, and reducing the risk of SR channel false triggering of shutdown protection.

[0086] S103, calculating an initial dimension conversion coefficient between the current and the count rate of the intermediate range detector based on the initial source range channel exit current threshold, the sensitivities of the source range detector and the intermediate range detector;

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

[0088] k=C*k_s*P;

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

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

[0091] It can be seen that this optional embodiment systematically associates the sensitivity difference between SR and IR detectors, threshold setting and conversion coefficient by expressing the initial dimensional conversion coefficient k as the product of the preset constant C, the sensitivity ratio k_s and the initial source range channel exit current threshold, thereby ensuring a strict match between the dimensional conversion coefficient and the physical characteristics of the detector, freeing the parameter setting from the limitations of a single empirical adjustment, improving the scientific nature of the calculation results and the global optimality of the parameter combination, and avoiding signal mismatch between channels due to sensitivity changes.

[0092] S104. Under full reactor power, according to a relationship function between the dimensional conversion coefficient and the output current, calculate the full-power final output current of the intermediate-range detector based on the initial dimensional conversion coefficient;

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

[0094] Calculate the full-power raw output current measured by the mid-range detector at full reactor power;

[0095] According to the relationship function between the dimension conversion coefficient and the output current, calculate the full power final output current I DC :

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

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

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

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

[0100] S105. Determine the final full-power output current according to the preset current condition, and determine the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to the determination 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 full-power final output current according to a preset current condition, and determining the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to 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 the preset current conditions:

[0103] When the final full-power output current meets the preset current 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;

[0104] When the full-power final output current 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 full-power final output current meets the preset current condition.

[0105] In an optional embodiment, the preset current condition means that the mid-range measurement channel is not saturated at full power, that is, the output current of the mid-range detector in DC mode is less than a preset current value, such as 9E-4A.

[0106] It can be seen that this optional embodiment performs closed-loop verification of the final full-power output current through preset current conditions, and dynamically adjusts the dimension conversion coefficient or exit current threshold based on the verification results. This method achieves the adaptability of parameter setting: when the full-power current exceeds the standard, the parameters are readjusted to balance the range overlap requirements 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 working conditions caused by parameter solidification in traditional experience adjustment, ensuring that the SR / IR channel parameters meet the dual constraints of "sufficient overlapping range" and "full power non-saturation" under any sensitivity combination, thereby improving the robustness of the system.

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

[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 maintains the initial dimension conversion coefficient unchanged and only lowers the initial source range channel exit current threshold. This method prioritizes sacrificing the right end of the partially overlapping range to meet the full-power current limit, while maintaining the matching relationship between the SR / IR sensitivity ratio and the conversion coefficient. This option avoids the signal chain logic conflicts that may arise from adjusting multiple parameters simultaneously. Furthermore, the lowering of the initial source range channel exit current threshold directly narrows the flux window at SR exit, further reducing the probability of false SR triggering a shutdown. Furthermore, by reducing the impact of the right shift of the overlapping range on monitoring continuity, it is controllable, balancing safety and adjustment efficiency.

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

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

[0112] By maintaining the initial source range channel exit current threshold unchanged and only reducing the initial dimensional conversion coefficient, this method directly suppresses the IR channel's final output current by reducing the initial dimensional conversion coefficient, while maintaining the stability of the SR exit flux window, ensuring that it meets the full-power unsaturation condition. While reducing the initial dimensional conversion coefficient is equivalent to compressing the IR channel's current signal range, 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 of the range overlap, prioritizes full-power monitoring effectiveness through signal scaling. This makes it suitable for scenarios with stringent requirements for SR exit timing stability, preventing the chain reaction of threshold changes on the start-up and shutdown logic.

[0113] See also Figure 2 As shown, Figure 2 1 is a schematic diagram of a parameter setting system for a nuclear instrument system disclosed in an embodiment of the present invention, including:

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

[0115] A first determining module 202 is configured to determine an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor;

[0116] A first calculation module 203 is configured to calculate an initial dimension conversion coefficient between the current and the count rate of the intermediate range detector based on the initial source range channel exit current threshold, the sensitivities of the source range detector and the intermediate range detector;

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

[0118] The first judgment module 205 is used to judge the final output current at full power according to the preset current condition, and 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] The specific definition of the parameter setting system for the nuclear instrumentation system can be found in the definition of the parameter setting method for the nuclear instrumentation system above and will not be repeated here. Each module in the parameter setting system for the nuclear instrumentation system described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above modules can be embedded in or independent of the processor in the electronic device in hardware format, or can be stored in the memory of the electronic device in software format to facilitate the processor to call the corresponding operations of each of the above modules.

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

[0121] See also Figure 3 As shown, Figure 3 This is a flow chart of another parameter setting method for a nuclear instrument system disclosed in an embodiment of the present invention, wherein the nuclear instrument system includes a source range detector and an intermediate range detector. Figure 3 As shown, the parameter setting method of the nuclear instrument system may include the following operations:

[0122] S301, obtaining the sensitivity of the source range detector and the intermediate range detector;

[0123] S302, determining an initial dimension conversion coefficient between the current and the count rate of the intermediate-range detector based on an ideal output current of the intermediate-range detector at full reactor power and a relationship function between the dimension conversion coefficient and the output current;

[0124] In an optional embodiment, the step of determining an initial dimensional conversion coefficient between the current and the count rate of the intermediate-range detector based on an ideal output current of the intermediate-range detector at full reactor power and a function of the relationship between the dimensional conversion coefficient and the output current includes:

[0125] According to the relationship function between the dimension conversion coefficient and the output current, the initial dimension conversion coefficient is calculated:

[0126]

[0127] Among them, I ideal represents the ideal output current, I0 represents the full-power original output current measured by the mid-range detector at full reactor power, and k DC Indicates the dimension conversion factor between current and count rate for mid-range detectors in DC mode.

[0128] It can be seen that this optional embodiment defines the initial dimensional conversion coefficient k as the ratio of the ideal output current to the full-power original output current and the DC mode dimensional conversion coefficient, and directly links the ideal current demand under full-power conditions to the detector's original signal characteristics and conversion coefficient, ensuring that the output current of the IR channel at full power is strictly controlled within the preset safety threshold. This not only avoids monitoring failure due to signal saturation, but also ensures that the calculation process is consistent with the actual performance of the detector through the physical measurement data of the full-power original output current and the DC mode dimensional conversion coefficient, overcoming the risk of full-power current exceeding the limit when setting the initial dimensional conversion coefficient based on traditional experience, and improving the scientific nature of parameter setting and adaptability to working conditions.

[0129] S303, calculating an initial source range channel exit current threshold of the intermediate range measurement channel according to the initial dimension conversion coefficient, the sensitivities 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] Wherein, C is the preset first constant, k_s is the sensitivity ratio of the source range detector to the intermediate range detector, and k is the initial dimension conversion coefficient.

[0133] It can be seen that this optional embodiment systematically associates the initial source range channel exit current threshold with the initial dimensional conversion coefficient, the sensitivity ratio and the preset constant C, ensuring that the calculation process of the initial source range channel exit current threshold takes into account the sensitivity difference of the SR / IR detector and the dimensional conversion logic, so that the setting of the exit threshold is no longer an isolated adjustment, but forms a closed loop with the full-power current constraint, avoiding the problems of insufficient range overlap or excessive redundancy that may be caused by artificial experience in setting the initial source range channel exit current threshold, ensuring the global optimality of the parameter combination, and improving system safety and monitoring continuity of the start-up and shutdown process.

[0134] S304, determining the range overlap between the source range measurement channel and the intermediate range measurement channel according to the initial source range channel exit current threshold;

[0135] In an optional embodiment, the step of determining the range overlap between the source range measurement channel and the intermediate range measurement channel according to 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] It can be seen that this optional embodiment uses the 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, forcing 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 capabilities between the preset minimum neutron flux level (left boundary) and the flux level (right boundary) at which IR is allowed to exit SR. 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, avoiding monitoring blind spots or logical conflicts that may be caused by the independent setting of the left and right boundaries of the overlapping range in traditional methods, and enhancing the systematic nature of parameter setting and the reliability of neutron flux monitoring.

[0138] S305. Determine the range overlap range according to the preset range overlap condition, and determine the dimension conversion coefficient and source range channel exit current threshold of the nuclear instrument system according to the determination 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 according to a preset range overlap condition, and determining the dimension conversion coefficient and the source range channel exit current threshold of the nuclear instrument system according to 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 the preset range overlap conditions:

[0141] 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;

[0142] When the range overlap range 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 re-determined range overlap range meets the preset range overlap condition.

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

[0144] It can be seen that this optional embodiment verifies the calculated range overlap range by presetting the range overlap condition, and dynamically adjusts the dimension conversion coefficient or the initial source range channel exit current threshold according to the verification result. This method realizes two-way optimization of parameter setting: 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 the range overlap requirement into a unified decision-making framework, solving the difficult problem of balancing the two when they contradict each other 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 working conditions, thereby improving the system robustness and parameter adaptation efficiency.

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

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

[0147] It can be seen that this optional embodiment adopts an adjustment strategy by keeping the initial dimensional conversion coefficient unchanged and only lowering the initial source range channel exit current threshold. Under the premise of maintaining the full power current constraint, this method satisfies the range overlap condition by reducing the right boundary of the range overlap range (i.e., the initial source range channel exit current threshold). Since the dimensional conversion coefficient remains unchanged, it means that the compliance of the full power output current of the IR channel is guaranteed. Although lowering the initial source range channel exit current threshold sacrifices the right end range of the partial overlap interval, it further reduces the probability of SR false triggering of the shutdown protection by forcing the SR to exit at a lower flux level. At the same time, because 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 constraints but high range overlap tolerance, achieving a controllable balance between safety and monitoring continuity.

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

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

[0150] It can be seen that this optional embodiment adopts an adjustment strategy of keeping the initial source range channel exit current threshold unchanged and only increasing the initial dimensional conversion coefficient. Under the premise of maintaining the stability of the SR exit logic trigger timing, this method expands the output current range of the IR channel by increasing the dimensional conversion coefficient, thereby indirectly expanding the right end of the range overlap range (because the initial source range channel exit current threshold is fixed and the right boundary remains unchanged, but the increase in the dimensional conversion coefficient can increase the current output of the IR 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 not only avoids the interference of the initial source range channel exit current threshold on the start-stop logic, but also enhances the signal resolution of the IR channel in the high-flux region through the optimization of the dimensional conversion coefficient. It is particularly suitable for scenarios with strict requirements on the stability of the SR exit timing and the need to expand the high-flux monitoring capability, and realizes the directional improvement of the system monitoring performance through parameter adjustment.

[0151] See also Figure 4 As shown, Figure 4 1 is a schematic diagram of the structure of another parameter setting system of a nuclear instrument system disclosed in an embodiment of the present invention, including:

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

[0153] The second determining module 402 is configured to determine an initial dimension conversion coefficient between the current and the count rate of the intermediate range detector according to an ideal output current of the intermediate range detector at full reactor power and a function of the relationship between the dimension conversion coefficient and the output current;

[0154] The third calculation module 403 is configured to calculate an initial source range channel exit current threshold of the intermediate range measurement channel according to the initial dimension conversion coefficient, the sensitivities of the source range detector and the intermediate range detector;

[0155] A third determining module 404 is configured to determine a range overlap between the source range measurement channel and the intermediate range measurement channel according to an 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 condition, and determine the dimension conversion coefficient and 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] The specific definition of the parameter setting system for the nuclear instrumentation system can be found in the definition of the parameter setting method for the nuclear instrumentation system above and will not be repeated here. Each module in the parameter setting system for the nuclear instrumentation system described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above modules can be embedded in or independent of the processor in the electronic device in hardware format, or can be stored in the memory of the electronic device in software format to facilitate the processor to call the corresponding operations of each of the above modules.

[0158] It should be noted that, in order to highlight the innovative part of the present invention, this embodiment does not introduce modules that are not closely related to solving the technical problem proposed by the present 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 establish 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 neutron flux monitoring are achieved, thereby improving the reliability and safety of the reactor nuclear instrumentation system. Therefore, this invention effectively overcomes the shortcomings of existing technologies 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 present invention. Anyone skilled in the art may 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 one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for setting parameters of a nuclear instrument system, characterized in that: The nuclear instrument 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 mid-range detector; Determining an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor; Calculating an initial dimension conversion coefficient between the current and the count rate of the intermediate range detector according to the initial source range channel exit current threshold, the sensitivities of the source range detector and the intermediate range detector; Under full reactor power, calculating the full-power final output current of the intermediate-range detector according to the initial dimensional conversion coefficient based on a relationship function between the dimensional conversion coefficient and the output current; The full-power final output current is judged according to the preset current condition, and the dimension 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 dimension conversion coefficient.

2. A parameter setting method for a nuclear instrument system according to claim 1, characterized in that: The step of determining an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor comprises: Determining a right boundary value of a preset ideal range overlap range between a source range measurement channel of the reactor and an intermediate range measurement channel of the reactor; The right boundary value is used as the initial source range channel exit current threshold of the mid-range measurement channel.

3. A parameter setting method for a nuclear instrument system according to claim 1, characterized in that: The initial dimension conversion coefficient k is calculated as follows: k=C*k_s*P; Wherein, C is a preset first constant, k_s is the sensitivity ratio of the source range detector to the intermediate range detector, and P is the initial source range channel exit current threshold.

4. A parameter setting method for a nuclear instrument system according to claim 1, characterized in that: At full reactor power, the step of calculating the full-power final output current of the intermediate-range detector according to the initial dimensional conversion coefficient based on a relationship function between the dimensional conversion coefficient and the output current comprises: Calculating the full-power original output current measured by the intermediate-range detector at full reactor power; According to the relationship function between the dimension conversion coefficient and the output current, calculate the full power final output current I DC : I DC =I0*k DC *k; Wherein, I0 represents the full power original output current, k DC represents the dimension conversion coefficient of the current and count rate of the intermediate range detector in DC mode, and k represents the initial dimension conversion coefficient.

5. A parameter setting method for a nuclear instrument system according to claim 1, characterized in that: The steps of judging the full-power final output current according to a preset current condition, and determining 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 include: Determine the final full-power output current based on the preset current condition: When the full-power final output current satisfies the preset current 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 full-power final output current 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 full-power final output current meets the preset current condition.

6. A parameter setting method for a nuclear instrument system according to claim 5, characterized in that: The step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold comprises: The initial dimension conversion coefficient is kept unchanged, and the initial source range channel exit current threshold is lowered.

7. A parameter setting method for a nuclear instrument system according to claim 5, characterized in that: The step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold comprises: The initial source range channel exit current threshold is maintained unchanged, and the initial dimension conversion coefficient is reduced.

8. A parameter setting system for a nuclear instrument system, characterized in that: include: A first acquisition module is used to obtain the sensitivity of the source range detector and the intermediate range detector; A first determining module is configured to determine an initial source range channel exit current threshold of the intermediate range measurement channel according to a preset ideal range overlap range between the source range measurement channel of the reactor and the intermediate range measurement channel of the reactor; a first calculation module, configured to calculate an initial dimension conversion coefficient of the current and the count rate of the intermediate range detector according to the initial source range channel exit current threshold, the sensitivities of the source range detector and the intermediate range detector; a second calculation module, under full reactor power, calculating the full-power final output current of the intermediate-range detector according to the initial dimensional conversion coefficient based on a relationship function between the dimensional conversion coefficient and the output current; The first judgment module is used to judge the full-power final output current according to the preset current condition, and determine the dimension conversion coefficient and 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.

9. A method for setting parameters of a nuclear instrument system, characterized in that: The nuclear instrument 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 mid-range detector; Determining an initial dimension conversion coefficient between the current and the count rate of the intermediate range detector according to an ideal output current of the intermediate range detector at full reactor power and a function of a relationship between the dimension conversion coefficient and the output current; Calculating an initial source range channel exit current threshold of the intermediate range measurement channel according to the initial dimension conversion coefficient, the sensitivities of the source range detector and the intermediate range detector; Determining a range overlap between a source range measurement channel and an intermediate range measurement channel according to the initial source range channel exit current threshold; The range overlap range is determined according to a preset range overlap condition, and the dimension 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 dimension conversion coefficient.

10. A parameter setting method for a nuclear instrument system according to claim 9, characterized in that: The initial dimension conversion coefficient k is calculated as follows: Among them, I ideal represents the ideal output current, I0 represents the full-power original output current measured by the intermediate-range detector at full reactor power, and k DC Indicates the dimension conversion coefficient between current and count rate of the mid-range detector in DC mode.

11. A parameter setting method for a nuclear instrument system according to claim 9, characterized in that: The initial source range channel exit current threshold P is calculated as follows: Wherein, C is a preset first constant, k_s is the sensitivity ratio of the source range detector to the intermediate range detector, and k is the initial dimension conversion coefficient.

12. A parameter setting method for a nuclear instrument system according to claim 9, characterized in that: The step of determining the range overlap between the source range measurement channel and the intermediate range measurement channel according to the initial source range channel exit current threshold comprises: 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.

13. A parameter setting method for a nuclear instrument system according to claim 9, characterized in that: The steps of judging the range overlap range according to a preset range overlap condition, and determining 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 include: Determine the range overlap range according to the preset range overlap condition: When the range overlap range satisfies 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 range 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 re-determined range overlap range meets the preset range overlap condition.

14. A parameter setting method for a nuclear instrument system according to claim 13, characterized in that: The step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold comprises: The initial dimension conversion coefficient is kept unchanged, and the initial source range channel exit current threshold is lowered.

15. A parameter setting method for a nuclear instrument system according to claim 13, characterized in that: The step of adjusting the initial dimension conversion coefficient and / or the initial source range channel exit current threshold comprises: The initial source range channel exit current threshold is maintained unchanged, and the initial dimension conversion coefficient is increased.

16. A parameter setting method for a nuclear instrument system according to claim 9, characterized in that: The step of determining an initial dimensional conversion coefficient between the current and the count rate of the intermediate range detector according to an ideal output current of the intermediate range detector at full reactor power and a relationship function between the dimensional conversion coefficient and the output current comprises: According to the relationship function between the dimension conversion coefficient and the output current, the initial dimension conversion coefficient k is calculated: Among them, I ideal represents the ideal output current of the intermediate-range detector at full reactor power, I0 represents the full-power original output current measured by the intermediate-range detector at full reactor power, and k DC Indicates the dimension conversion factor between current and count rate for mid-range detectors in DC mode.

17. A parameter setting system for a nuclear instrument system, characterized in that: include: A second acquisition module is used to obtain the sensitivity of the source range detector and the intermediate range detector; A second determining module is configured to determine an initial dimension conversion coefficient between the current and the count rate of the intermediate range detector according to an ideal output current of the intermediate range detector at full reactor power and a relationship function between the dimension conversion coefficient and the output current; a third calculation module, configured to calculate an initial source range channel exit current threshold of the intermediate range measurement channel according to the initial dimension conversion coefficient, the sensitivities of the source range detector and the intermediate range detector; a third determining module, configured to determine a range overlap between a source range measurement channel and an intermediate range measurement channel according to an exit current threshold of the initial source range channel; The second judgment module is used to judge the range overlap range according to the preset range overlap condition, and determine the dimension conversion coefficient and 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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