Method and device for linearly adjusting overlapping performance of working modes of fission chamber and storage medium

Abstract

The invention relates to a fission chamber working mode overlapping linear adjustment method and device and a storage medium. The method comprises the steps that original signals of a pulse mode, an alternating current mode and a direct current mode of a fission chamber detector are collected according to preset parameters; adjusting a saturation counting rate and a gain coefficient of a pulse mode and a compensation value and a gain coefficient of an alternating current mode according to the original signal so as to realize linear fitting of the pulse mode and the alternating current mode in a first overlapping interval; adjusting a compensation value and a gain coefficient of a direct current mode according to the original signal so as to realize linear fitting of the alternating current mode and the direct current mode in a second overlapping interval; and verifying the linearity of the output current in each overlapping interval and the consistency between the channels, and transmitting the verified parameter setting to the nuclear instrumentation system. The signal overlapping and linearity of the fission chamber of the nuclear instrumentation system in different working modes are realized, and the consistency between different fission chamber channels is improved.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power plant nuclear instrument system debugging, and in particular to a method, device and storage medium for adjusting the overlapping linearity of a fission chamber working mode. Background Art

[0002] The fission chamber has three working modes: pulse mode, alternating current (AC) mode and direct current (DC) mode. When the neutron flux level is relatively low, the fission chamber outputs a pulse signal, and the neutron flux is measured by the pulse counting rate. As the neutron flux level increases, the current pulses generated tend to be denser, and the pulse signals are superimposed on each other, making it impossible to distinguish a single pulse, so the pulse counting method cannot be used. At this time, the output signal of the fission chamber is a fluctuating DC current. According to Campbell's theory, the mean square voltage of the signal is proportional to the neutron flux level. When the neutron flux increases further, the DC current of the detector loop is proportional to the core neutron flux. Since the physical quantities that characterize the core neutron flux level in the three modes have different dimensions, it is necessary to convert the signal of each mode into a unified current signal for output in the signal processing link. In order to ensure the linearity and stability of the final output current of the fission chamber measurement channel, it is necessary to adjust the overlap parameters of each mode to reduce the deviation of the output current of different modes in the overlapping interval and achieve a smooth transition between modes. At the same time, the adjustment of the overlap parameters also needs to consider the consistency of the output current between different measurement channels, which helps the operator to judge the neutron flux level of the reactor and is also conducive to fault judgment during the operation and maintenance of nuclear measurement instruments.

[0003] The existing fission working mode coefficient adjustment method only uses the weighting factor to perform weighted averaging of the pulse mode and the AC mode in the overlapping interval, so that the two signals can switch smoothly within a certain section. However, the existing technology only considers two mode signals and does not cover all fission mode signals. In addition, the existing technical solution only performs weighted averaging on the output signals of the two modes. This weighted averaging can only avoid the sudden change of the signal before and after the overlapping area, and cannot guarantee the overall linearity of the signal within the full range, that is, the signal finally output by the channel has no sudden change in the overlapping interval, but the slope is different before and after the overlapping interval. Summary of the invention

[0004] The purpose of the embodiments of the present application is to propose a method, device and storage medium for adjusting the overlap linearity of fission chamber working modes, so as to achieve signal overlap and linearity in different working modes of the fission chamber of a nuclear instrument system, and improve the consistency between different fission chamber channels.

[0005] In order to solve the above technical problems, the embodiment of the present application provides a method for adjusting the overlapping linearity of the fission chamber working mode, including:

[0006] Collecting original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters;

[0007] Adjusting the saturation count rate and gain coefficient of the pulse mode, the compensation value and gain coefficient of the AC mode according to the original signal, so as to achieve linear fit between the pulse mode and the AC mode in the first overlapping interval;

[0008] Adjust the compensation value and the gain coefficient of the DC mode according to the original signal to make the AC mode and the DC mode linearly fit in the second overlapping interval;

[0009] Verify the linearity of the output current and the consistency between channels in each overlapping interval, and transmit the verified parameter settings to the nuclear instrumentation system.

[0010] In order to solve the above technical problems, the embodiment of the present application provides a fission chamber working mode overlapping linear adjustment device, including:

[0011] The original signal acquisition module is used to acquire the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters;

[0012] A first linear adjustment module, used for adjusting the saturation count rate and gain coefficient of the pulse mode, the compensation value and gain coefficient of the AC mode according to the original signal, so as to make the pulse mode and the AC mode linearly fit in the first overlapping interval;

[0013] A second linear adjustment module, used for adjusting the compensation value and the gain coefficient of the DC mode according to the original signal, so as to make the AC mode and the DC mode linearly fit in the second overlapping interval;

[0014] The linearity verification module is used to verify the linearity of the output current in each overlapping interval and the consistency between channels, and transmit the verified parameter settings to the nuclear instrument system.

[0015] In order to solve the above technical problems, a technical solution adopted by the present invention is: a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements any one of the above-mentioned methods for linearly adjusting the overlapping fission chamber working modes.

[0016] The embodiment of the present invention provides a method, device and storage medium for adjusting the overlap linearity of the fission chamber working mode. The method includes: collecting the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters; adjusting the saturation count rate, gain coefficient, compensation value and gain coefficient of the pulse mode according to the original signal, so that the pulse mode and the AC mode are linearly fitted in the first overlapping interval; adjusting the compensation value and gain coefficient of the DC mode according to the original signal, so that the AC mode and the DC mode are linearly fitted in the second overlapping interval; verifying the linearity of the output current in each overlapping interval and the consistency between channels, and transmitting the verified parameter settings to the nuclear instrument system. The embodiment of the present invention collects signals under different working modes of the fission chamber, and linearly fits the overlapping intervals under different modes according to the collected signals, thereby realizing the signal overlap and linearity of the fission chamber under different working modes of the nuclear instrument system, which is conducive to improving the consistency between different fission chamber channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a flow chart of the implementation of the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of the fission working mode and the overlapping area provided in the embodiment of the present application;

[0020] Figure 3 It is a flowchart for realizing the first sub-process in the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application;

[0021] Figure 4 is a flow chart of the Pulse-AC fitting process provided in an embodiment of the present application;

[0022] Figure 5 It is a flow chart for realizing the second sub-process in the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application;

[0023] Figure 6 AC provided in the embodiment of the present application Signal -R c Linear fitting diagram;

[0024] Figure 7This is a schematic diagram of determining the dead time correction saturation count rate provided in an embodiment of the present application;

[0025] Figure 8 It is a flowchart for realizing the third sub-process in the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application;

[0026] Fig. 9 is a schematic diagram of a first output current and a second output current before adjustment provided in an embodiment of the present application;

[0027] Fig.10 is a schematic diagram of the adjusted first output current and the second output current provided in an embodiment of the present application;

[0028] Fig.11 It is a schematic diagram of comparing the slope intercept of the linear fitting before and after adjustment provided in the embodiment of the present application;

[0029] Fig.12 It is a flowchart for realizing the fourth sub-process in the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application;

[0030] Fig.13 is an AC-DC mode adjustment flow chart provided in an embodiment of the present application;

[0031] Fig.14 It is a flowchart for realizing the fifth sub-process in the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application;

[0032] Fig.15 is a schematic diagram of the AC-DC current relationship before adjustment provided in an embodiment of the present application;

[0033] Fig.16 It is a schematic diagram of the overlapping linear adjustment device of the fission chamber working mode provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the overlapping linear adjustment method of the fission chamber working mode provided in the embodiment of the present application is applied to the nuclear instrument system, and correspondingly, the overlapping linear adjustment device of the fission chamber working mode can also be generally applied to the nuclear instrument system.

[0039] Among them, the nuclear instrumentation system (NIS) measures the core leakage neutrons through the detectors arranged outside the reactor pressure vessel, monitors the core neutron flux level, and provides signals for reactor protection and control, which is crucial to the safe operation of nuclear reactors. -2 ~10 10 n / (cm 2 s), using three ranges (source range SR, intermediate range IR, power range PR) detectors to measure the flux level of the reactor from startup to full power, among which the monitoring range of the intermediate range detector is from 10 1 ~10 10 n / (cm 2 s), in order to meet the core flux monitoring under strong gamma field after the accident, the use of fission chamber as an intermediate range detector has become the mainstream technical choice for the third generation of nuclear power. The fission chamber is a gas detector, which consists of three cylindrical structures from the outside to the inside: the outer shell, the positive electrode, and the signal electrode. The inner surface of the positive electrode and the outer surface of the signal electrode are coated with high-enriched uranium ( 235 U).

[0040] Neutrons and fissile material 235 U undergoes nuclear reaction to produce fission fragments, which enter the filling gas and cause the filling gas in the chamber to ionize and form pulses or currents. After being processed by the logarithmic amplifier, the output pulses or currents are used for reactor power display, cycle calculation and reactor protection. The main fission reaction is as follows: Since the energy released by a single fission reaction is very high, the fission chamber can still maintain a high signal-to-noise ratio in a low neutron flux and strong gamma environment, so the fission type is often used to monitor the core neutron flux level after an accident. The fission ionization chamber has three operating modes: pulse mode, alternating current (AC) mode, and direct current (DC) mode. Since the dimensions of the physical quantities that characterize the core neutron flux level in the three modes are different, it is necessary to convert the signal of each mode into a unified current signal for output in the signal processing link. Therefore, in order to ensure the linearity and stability of the final output current of the fission chamber measurement channel, the embodiment of the present application needs to adjust the overlap parameters of each mode to reduce the deviation of the output current of different modes in the overlapping interval, so as to achieve a smooth transition between modes.

[0041] See also Figure 1 , Figure 1 A specific implementation of the overlapping linear adjustment method of the fission chamber working mode is shown.

[0042] It should be noted that if there are substantially the same results, the method of the present invention is not limited to Figure 1 The process sequence shown is limited to the following steps:

[0043] S1: Collect the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters.

[0044] See also Figure 2 , Figure 2 It is a schematic diagram of the fission working mode and overlapping area provided in the embodiment of the present application.

[0045] Since the fission chamber has three working modes, namely Pulse mode, AC mode and DC mode, and the three working modes overlap each other, the output current of the measurement channel is divided into five modes, namely pure Pulse mode, Pulse-AC overlapping mode, pure AC mode, AC-DC overlapping mode and pure DC mode. Figure 2 As shown in the figure, the pulse-AC overlap interval is [Klow1, Khigh1], and the AC-DC overlap interval is [Klow2, Khigh2]. The purpose of setting the overlap mode is to prevent the output current from changing suddenly (including sudden change in value and sudden change in linearity) during the mode switching process. After the reactor is started, a set of optimal overlap parameters is analyzed based on the source signals output by the pulse mode, AC mode, and DC mode, which can ensure the good linearity of the output current of a single channel and the consistency of the output current of different channels.

[0046] In a specific embodiment, the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector are collected according to preset parameters during the process of increasing the core neutron flux or increasing the reactor power until the original signals reach the upper limit values ​​of each overlapping interval.

[0047] Specifically, before the linear fitting of the pulse mode and the AC mode in the first overlapping interval, it is necessary to preset the Pulse and AC mode parameters for each fission chamber detector channel, including the saturation count rate R of the pulse mode. sat and gain factor G Pulse , and the compensation value AC in AC mode offset and gain factor G AC Four parameters. The data acquisition process is: fission chamber output data acquisition, the signal to be collected is the filtered count rate R of the pulse mode m , AC mode mean square current signal AC signal Or it can be restored to R through operation m , AC signal Signals (such as the count rate Rc after collecting the dead zone correction, the output current I Pulse , AC mode output current I AC , using the preset parameters to calculate R m , AC signal ); introduce positive reactivity to increase the core neutron flux level with a stable doubling cycle until I AC When the upper limit Khigh1 of the fitting interval is exceeded, data collection is stopped.

[0048] Before the linear fitting of the AC mode and the DC mode in the first overlapping interval, the DC mode parameters are preset for each fission chamber detector channel, including the DC mode compensation value DC offset , DC mode gain factor G DC Then we start to collect the fission chamber output data. The signal to be collected is the output current I in AC mode. AC , DC mode output current I DC Or it can be restored to I through operation AC ,I DC signal; during the process of reactor power increase, continue to record data until I DC When the upper limit Khigh2 of the fitting interval is exceeded, data collection is stopped.

[0049] S2: adjusting the saturation count rate and gain coefficient of the pulse mode, the compensation value and gain coefficient of the AC mode according to the original signal, so as to achieve linear fit between the pulse mode and the AC mode in the first overlapping interval.

[0050] See also Figure 3and Figure 4 , Figure 3 A specific implementation of step S2 is shown. Figure 4 : is a flow chart of the Pulse-AC fitting process provided by the embodiment of the present application, which is described in detail as follows:

[0051] S21: For each fission chamber channel, selecting a corresponding fitting data segment from the filtered count rate and the mean square current signal according to a first preset data selection principle.

[0052] Specifically, for each fission chamber channel, the corresponding fitting data segment is selected from the filtered count rate and mean square current signal according to the first preset data selection principle. The first preset data selection principle is: (1) the count rate Rc and the mean square current signal ACSignal after signal dead zone correction in the selected segment need to be linearly related, or as linearly related as possible; (2) the selected segment cannot exceed the saturation point of the pulse mode; (3) the IPulse current corresponding to the flux level at the starting point of the selected segment is lower than Klow1; (4) the IAC current corresponding to the flux level at the end point of the selected segment is higher than Khigh2.

[0053] S22: maximizing the linear correlation coefficient between the mean square current signal and the corrected count rate by adjusting the saturation count rate to determine the dead time corrected saturation count rate.

[0054] See also Figures 5 to 7 , Figure 5 A specific implementation of step S22 is shown. Figure 6 AC provided in the embodiment of the present application Signal -R c Linear fitting diagram, Figure 7 This is a schematic diagram of determining the dead time correction saturation count rate provided in an embodiment of the present application, which is described in detail as follows:

[0055] S221: Convert the filtered count rate into the corrected count rate through the saturated count rate.

[0056] S222: Perform a linear fitting calculation based on the mean square error current signal and the corrected count rate to obtain the linear correlation coefficient.

[0057] Specifically, by the saturation count rate R sat The filtered count rate R m Converted to the corrected count rate R c .like Figure 6 As shown, the mean square current signal AC Signal is the horizontal axis, R c As the vertical axis, draw AC Signal -Rc Linear relationship, use linear fitting to calculate AC Signal -R c The linear correlation coefficient R 2 .

[0058] S223: Adjust the saturation count rate to select the saturation count rate corresponding to the maximum linear relative coefficient, and obtain the dead time corrected saturation count rate.

[0059] like Figure 7 As shown, adjust the saturation count rate R sat To select the maximum linear relative coefficient R 2 The corresponding saturation count rate R sat , and obtain the dead time corrected saturation count rate.

[0060] S23: recalculating the mean square current signal and the gain coefficient of the AC mode using a linear regression equation based on the dead time corrected saturation count, so that the output current of the pulse mode and the output current of the AC mode overlap in the first overlapping interval.

[0061] See also Figures 8 to 11 , Figure 8 A specific implementation of step S23 is shown. Fig. 9 is a schematic diagram of the first output current and the second output current before adjustment provided in an embodiment of the present application, Fig.10 is a schematic diagram of the adjusted first output current and the second output current provided in an embodiment of the present application, Fig.11 : is a schematic diagram of the comparison of the slope intercept of the linear fitting before and after adjustment provided in the embodiment of the present application, which is described in detail as follows:

[0062] S231: Calculate the output current of the pulse mode and the output current of the AC mode according to the dead time corrected saturated count rate, the gain coefficient of the pulse mode, the mean square current signal and the gain coefficient of the AC mode to obtain a first output current and a second output current.

[0063] Specifically, the first output current is calculated using the following formula (1):

[0064]

[0065] Among them, R c is the counting rate after dead zone correction, in cps; R m is the counting rate after filtering, in cps; R sat is the saturation count rate, an adjustable parameter, in cps; I Pulse is the output current in pulse mode (i.e., the first output current), in A; G PulseIt is the gain factor of pulse mode, an adjustable parameter, and its unit is A / cps.

[0066] The second output current is calculated using the following formula (2):

[0067] I AC =(AC signal -AC offset )·G AC (2);

[0068] Among them, I AC Output current in AC mode, unit: A; AC signal It is the mean square current signal collected in AC mode, unit is A 2 ;AC offset Compensation value of AC mode, adjustable parameter, unit A 2 ; G AC Gain factor of AC mode, adjustable parameter, unit A -1 .like Fig. 9 As shown, the figure is a schematic diagram of the first output current and the second output current before adjustment.

[0069] S232: If the second output current corresponding to the saturation point of the pulse mode is smaller than the upper limit of the first overlapping interval, adjust the gain coefficient of the pulse mode so that the second output current corresponding to the saturation point of the pulse mode is larger than the upper limit of the first overlapping interval.

[0070] Specifically, if the pulse mode saturation point corresponds to I Pulse Less than Khigh1, adjust G Pulse The I corresponding to the saturation point of the pulse mode Pulse Greater than Khigh1.

[0071] S233: recalculating the mean square current signal and the gain coefficient of the AC mode using the linear regression equation, so that the new first output current and the new second output current overlap in the first overlapping interval.

[0072] In a specific embodiment, a linear fitting calculation is performed on the first output current and the second output current to obtain a first slope and a first intercept; a first compensation value and a first gain coefficient of the AC mode are calculated based on the first slope and the first intercept; and the first output current and the second output current are adjusted by the first compensation value and the first gain coefficient so that the adjusted first output current and the second output current overlap in the first overlapping interval.

[0073] In a specific embodiment, assuming the new fitting coefficient: the first compensation value AC offset,new、 The first gain factor G AC,newThe new first output current I Pulse，new and the new second output current I AC，new The first compensation value and the first gain coefficient of the AC mode are calculated by combining a second preset formula, and the second preset formula is:

[0074] A second preset formula is used to calculate the first compensation value and the first gain coefficient of the AC mode. The second preset formula is:

[0075]

[0076] Among them, I AC，new is the adjusted second output current, I AC is the output current of the AC mode, I Pulse is the output current of the pulse mode, AC offset,new is the first compensation value, G AC,new is the first gain coefficient, AC offset is the compensation value of the AC mode, G AC is the gain coefficient of the AC mode, k is the first slope and b is the first intercept, G AC,Old is the previous gain coefficient of the AC mode, AC offset,old is the previous compensation value in AC mode.

[0077] Use the new fitting coefficients AC offset,new , G AC,new Computation I AC And redraw the curve to observe the coincidence of pulse current and AC current in the overlapping interval, such as Fig.10 As shown, Fig.10 1 is a schematic diagram of the adjusted first output current and the second output current provided in the embodiment of the present application, that is, a schematic diagram showing the comparison between the new first output current and the new second current. Fig.11 As shown, the corresponding relationship between IPulse and IAC before and after adjustment in the selected interval is plotted, and it is confirmed that the slope of the linear fitting formula after adjustment is close to 1 and the intercept is close to 0.

[0078] S24: Calculate the first overlapping interval current, and adjust the current relative deviation according to the output current in the pulse mode, the output current in the AC mode, and the first overlapping interval current, so that the current relative deviation is less than a preset system alarm value.

[0079] In a specific embodiment, the first overlapping interval current is calculated by a first preset formula (4), and the first preset formula is:

[0080]

[0081] Among them, IPulse_AC is the first overlapping interval current, I AC is the output current of the AC mode, I Pulse is the output current of the pulse mode, Klow1 and Khigh1 are the lower limit and upper limit of the first overlapping interval respectively.

[0082] The current relative deviation is calculated using the following formula (5):

[0083]

[0084] Where Err is the relative current deviation, I Pulse，new is the new first output current and I AC，new is the new second output current, I AC,Pulse or I Pulse_AC Both are currents in the first overlapping interval.

[0085] Specifically, if the current relative deviation is not less than the system alarm value, the process returns to step S21 to reselect data and re-perform linear fitting of the overlapping interval until the newly generated current relative deviation is less than the system alarm value.

[0086] It should be noted that the system alarm value is set according to the actual situation and is not limited here. In a specific embodiment, the system alarm value is set to 0.2.

[0087] Furthermore, by comparing the data of multiple fission chamber detector channels, in order to eliminate the differences in sensitivity between detectors in different measurement channels and between signal processing circuits, G can be adjusted. Pulse After adjustment, the parameter calculation is re-executed from step S231 until the overlap deviation of each channel is less than the system alarm value and the consistency between the channels meets the requirements.

[0088] S3: adjusting the compensation value and the gain coefficient of the DC mode according to the original signal, so as to achieve linear fit between the AC mode and the DC mode in the second overlapping interval.

[0089] See also Fig.12 and Fig.13 , Figure 5 A specific implementation of step S3 is shown. Fig.13 This is an AC-DC mode adjustment flow chart provided in an embodiment of the present application, which is described in detail as follows:

[0090] S31: For each fission chamber channel, selecting a corresponding fitting data segment from the current output current in the AC mode and the output current in the DC mode according to a second preset data selection principle.

[0091] Specifically, the second preset data selection principle is: (1) the current output current I of the signal AC mode in the selected section AC , DC mode output current I DC It needs to be linearly related or as linearly related as possible; (2) The current output current I of the AC mode corresponding to the flux level at the starting point of the selected segment AC The current is lower than Klow2; (3) The output current I in DC mode corresponding to the flux level at the end point of the selected segment DC The current is higher than Khigh2.

[0092] S32: adjusting the compensation value and the gain coefficient of the DC mode based on a linear regression equation so that the current output current of the AC mode and the output current of the DC mode overlap within the second overlapping interval.

[0093] See also Fig.14 and Fig.15 , Fig.14 A specific implementation of step S32 is shown. Fig.15 Schematic diagram of the AC-DC current relationship before adjustment provided in the embodiment of the present application, as described in detail as follows:

[0094] S321: Calculate a second slope and a second intercept based on the current output current in the AC mode and the output current in the DC mode through a linear regression equation.

[0095] Specifically, the linear regression equation is DC = k·I AC +b, k is the second slope, b is the second intercept, I AC is the current output current in AC mode, I DC is the output current in DC mode.

[0096] S322: Calculate a second compensation value and a second gain coefficient according to the second slope, the second intercept, the compensation value of the DC mode and the gain coefficient.

[0097] Specifically, the second compensation value and the second gain coefficient are calculated using the following formula (6):

[0098]

[0099] Among them, DC offset，new is the second compensation value and G DC,new is the second gain factor, DC offset，old and G DC,old are the previous compensation value and gain factor for DC mode.

[0100] S323: adjusting the current output current of the AC mode and the output current of the DC mode according to the second compensation value and the second gain coefficient, so that the adjusted current output current of the AC mode and the output current of the DC mode overlap in the second overlapping interval.

[0101] Specifically, the current output current in the AC mode and the output current in the DC mode are adjusted so that the adjusted current output current in the AC mode and the output current in the DC mode overlap in the second overlapping interval.

[0102] Furthermore, the output current in DC mode is calculated by formula (7):

[0103] I DC =(DC signal -DC offset )·G DC (7);

[0104] Among them, I DC is the output current in DC mode, in A; DC signal It is the current signal collected in DC mode, unit is A; DC offset is the compensation value of DC mode, adjustable parameter, unit is A; G DC is the gain factor of the DC mode, an adjustable parameter, dimensionless.

[0105] S33: Calculate the target current relative deviation in the second overlapping interval so that the target current relative deviation is smaller than a preset system alarm value.

[0106] In a specific embodiment, the current in the second overlapping interval is calculated based on the current output current of the AC mode and the output current of the DC mode to obtain the overlapping interval current; the target current relative deviation is calculated based on the overlapping interval current, the current output current of the AC mode and the output current of the DC mode; if the target current relative deviation is not less than the preset system alarm value, return to select the fitting data segment to recalculate the new target current relative deviation until the new target current relative deviation is less than the preset system alarm value.

[0107] Specifically, the overlap interval current I is calculated by the following formula (8): AC,DC ;

[0108]

[0109] Specifically, the target current relative deviation Err is calculated by the following formula (9):

[0110]

[0111] Furthermore, by comparing the data of multiple fission chamber detector channels, the G of some channels can be adjusted to eliminate the differences in sensitivity between detectors in different measurement channels and between signal processing circuits. DC , until the overlap deviation of each channel is less than the system alarm value and the consistency between channels meets the requirements.

[0112] S4: Verify the linearity of the output current and the consistency between channels in each overlapping interval, and transmit the verified parameter settings to the nuclear instrument system.

[0113] Specifically, in the verification of the first overlapping interval: set the new parameters to the system and make them effective, change the core flux and collect data, and verify the consistency of the pulse mode, AC mode overlap linearity and channels after the new parameters take effect. In the verification of the second overlapping interval: set the new parameters to the system and make them effective, re-collect data during the reactor power change process, and verify the consistency of the AC and DC mode overlap linearity and channels after the new parameters take effect.

[0114] In the embodiment of the present application, the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector are collected according to preset parameters; the saturation count rate, gain coefficient, compensation value and gain coefficient of the pulse mode are adjusted according to the original signals, so that the linear fitting of the pulse mode and the AC mode in the first overlapping interval is achieved; the compensation value and gain coefficient of the DC mode are adjusted according to the original signals, so that the linear fitting of the AC mode and the DC mode in the second overlapping interval is achieved; the linearity of the output current in each overlapping interval and the consistency between channels are verified, and the verified parameter settings are transmitted to the nuclear instrument system. The embodiment of the present invention collects signals under different working modes of the fission chamber, and linearly fits the overlapping intervals under different modes according to the collected signals, thereby achieving signal overlap and linearity of the fission chamber under different working modes of the nuclear instrument system, which is conducive to improving the consistency between different fission chamber channels.

[0115] The embodiments of the present application ensure the continuity and linearity of the signal output of the fission chamber of the nuclear instrument system in different operating modes, improve the accuracy and reliability of the nuclear instrument system in monitoring the neutron flux level in the core, and at the same time, the adjustment method can improve the consistency between different fission chamber channels, which is beneficial to parameter monitoring and fault diagnosis during debugging and operation and maintenance.

[0116] Please refer to Fig.16 , as a response to the above Figure 1 The present application provides an embodiment of a device for adjusting the overlap linearity of a fission chamber operating mode. Figure 1 Corresponding to the method embodiment shown, the device can be specifically applied in a nuclear instrumentation system.

[0117] like Fig.16 As shown, the fission chamber working mode overlap linear adjustment device of this embodiment includes: an original signal acquisition module 51, a first linear adjustment module 52, a second linear adjustment module 53 and a linearity verification module 54, wherein:

[0118] The original signal acquisition module 51 is used to acquire the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters;

[0119] A first linear adjustment module 52, configured to adjust the saturation count rate and gain coefficient of the pulse mode, the compensation value and gain coefficient of the AC mode according to the original signal, so as to achieve linear fitting of the pulse mode and the AC mode in the first overlapping interval;

[0120] A second linear adjustment module 53, configured to adjust the compensation value and the gain coefficient of the DC mode according to the original signal, so as to achieve linear fitting of the AC mode and the DC mode in the second overlapping interval;

[0121] The linearity verification module 54 is used to verify the linearity of the output current in each overlapping interval and the consistency between channels, and transmit the verified parameter settings to the nuclear instrument system.

[0122] Furthermore, the original signal includes the filtered count rate in the pulse mode and the mean square current signal in the DC mode; the first linear adjustment module 52 includes:

[0123] A first data segment selection unit, for selecting a corresponding fitting data segment from the filtered count rate and the mean square current signal according to a first preset data selection principle for each fission chamber channel;

[0124] a saturation count rate determination unit, configured to maximize a linear correlation coefficient between the mean square current signal and the corrected count rate by adjusting the saturation count rate, so as to determine a dead time corrected saturation count rate;

[0125] a first current overlap unit, configured to recalculate the mean square current signal and the gain coefficient of the AC mode by using a linear regression equation based on the dead time corrected saturation count, so that the output current of the pulse mode and the output current of the AC mode overlap within the first overlap interval;

[0126] The current relative deviation adjustment unit is used to calculate the first overlapping interval current and adjust the current relative deviation according to the output current of the pulse mode, the output current of the AC mode and the first overlapping interval current so that the current relative deviation is less than a preset system alarm value.

[0127] Further, the saturation count rate determination unit includes:

[0128] a count rate conversion unit, configured to convert the filtered count rate into the corrected count rate by using the saturated count rate;

[0129] A linear correlation coefficient calculation unit, used for performing a linear fitting calculation according to the mean square error current signal and the corrected count rate to obtain the linear correlation coefficient;

[0130] The saturation count rate selection unit is used to adjust the saturation count rate to select the saturation count rate corresponding to the maximum linear relative coefficient to obtain the dead time corrected saturation count rate.

[0131] Furthermore, the first current coincidence unit includes:

[0132] an output current calculation unit, configured to calculate the output current of the pulse mode and the output current of the AC mode according to the dead time corrected saturated count rate, the gain coefficient of the pulse mode, the mean square current signal and the gain coefficient of the AC mode, so as to obtain a first output current and a second output current;

[0133] a gain coefficient adjustment unit, configured to adjust the gain coefficient of the pulse mode so that the second output current corresponding to the saturation point of the pulse mode is greater than the upper limit value of the first overlapping interval if the second output current corresponding to the saturation point of the pulse mode is less than the upper limit value of the first overlapping interval;

[0134] The gain coefficient recalculation unit is used to recalculate the mean square current signal and the gain coefficient of the AC mode by using the linear regression equation, so that the new first output current and the new second output current overlap in the first overlapping interval.

[0135] Further, the gain coefficient recalculation unit includes:

[0136] A linear fitting calculation unit, used for performing a linear fitting calculation on the first output current and the second output current to obtain a first slope and a first intercept;

[0137] a compensation value calculation unit, configured to calculate a first compensation value and a first gain coefficient of the AC mode according to the first slope and the first intercept;

[0138] An output current adjustment unit is used to adjust the first output current and the second output current by using the first compensation value and the first gain coefficient, so that the adjusted first output current and the second output current overlap in the first overlapping interval.

[0139] Further, the first overlapping interval current is calculated by a first preset formula, and the first preset formula is:

[0140]

[0141] Among them, I Pulse_AC is the first overlapping interval current, I AC is the output current of the AC mode, I Pulse is the output current of the pulse mode, Klow1 and Khigh1 are the lower limit and upper limit of the first overlapping interval respectively.

[0142] Furthermore, a second preset formula is used to calculate the first compensation value and the first gain coefficient of the AC mode, and the second preset formula is:

[0143]

[0144] Among them, I AC，new is the adjusted second output current, I AC is the output current of the AC mode, I Pulse is the output current of the pulse mode, AC offset,new is the first compensation value, G AC,new is the first gain coefficient, AC offset is the compensation value of the AC mode, G AC is the gain coefficient of the AC mode, k is the first slope and b is the first intercept, G AC,Old is the previous gain coefficient of the AC mode, AC offset,old is the previous compensation value in AC mode.

[0145] Furthermore, the original signal also includes the current output current of the AC mode and the output current of the DC mode; the second linear adjustment module 53 includes:

[0146] A second data segment selection unit is used for selecting a corresponding fitting data segment based on the current output current in the AC mode and the output current in the DC mode for each fission chamber channel according to a second preset data selection principle;

[0147] a second current overlap unit, configured to adjust the compensation value and the gain coefficient of the DC mode based on a linear regression equation so that the current output current of the AC mode and the output current of the DC mode overlap within the second overlap interval;

[0148] The target current relative deviation calculation unit is used to calculate the target current relative deviation in the second overlapping interval so that the target current relative deviation is smaller than a preset system alarm value.

[0149] Furthermore, the second current coincidence unit includes:

[0150] A second intercept calculation unit, configured to calculate a second slope and a second intercept based on the current output current in the AC mode and the output current in the DC mode through a linear regression equation;

[0151] A second gain coefficient calculation unit, used for calculating a second compensation value and a second gain coefficient according to the second slope, the second intercept, the compensation value of the DC mode and the gain coefficient;

[0152] An interval current overlap unit is used to adjust the current output current of the AC mode and the output current of the DC mode according to the second compensation value and the second gain coefficient, so that the adjusted current output current of the AC mode and the output current of the DC mode overlap in the second overlapping interval.

[0153] Furthermore, the target current relative deviation calculation unit includes:

[0154] an overlapping interval current calculation unit, configured to calculate a current in the second overlapping interval according to a current output current in the AC mode and an output current in the DC mode, so as to obtain an overlapping interval current;

[0155] A relative deviation calculation unit, configured to calculate the target current relative deviation according to the overlapping interval current, the current output current of the AC mode, and the output current of the DC mode;

[0156] The return calculation unit is used to return to select the fitting data segment to recalculate the new target current relative deviation if the target current relative deviation is not less than the preset system alarm value, until the new target current relative deviation is less than the preset system alarm value.

[0157] Furthermore, the original signal acquisition module 51 includes:

[0158] The data acquisition unit is used to collect the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters during the process of increasing the neutron flux in the core or increasing the reactor power, until the original signals reach the upper limit values ​​of each overlapping interval.

[0159] The present application also provides another embodiment, namely, providing a computer-readable storage medium, which stores a computer program, and the computer program can be executed by at least one processor to enable the at least one processor to perform the steps of the above-mentioned method for overlapping linear adjustment of fission chamber working modes.

[0160] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods of each embodiment of the present application.

[0161] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is similarly within the scope of protection of the present application.

Claims

1. A method for adjusting the overlap linearity of fission chamber working modes, characterized in that: include: Collecting original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters; Adjusting the saturation count rate and gain coefficient of the pulse mode, the compensation value and gain coefficient of the AC mode according to the original signal, so as to achieve linear fit between the pulse mode and the AC mode in the first overlapping interval; Adjust the compensation value and the gain coefficient of the DC mode according to the original signal to make the AC mode and the DC mode linearly fit in the second overlapping interval; Verify the linearity of the output current and the consistency between channels in each overlapping interval, and transmit the verified parameter settings to the nuclear instrumentation system.

2. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 1, characterized in that: The original signal includes the filtered count rate in the pulse mode and the mean square current signal in the DC mode; the saturated count rate, the gain coefficient, the compensation value and the gain coefficient of the AC mode are adjusted according to the original signal to make the linear fit of the pulse mode and the AC mode in the first overlapping interval, including: For each fission chamber channel, selecting a corresponding fitting data segment from the filtered count rate and the mean square current signal according to a first preset data selection principle; By adjusting the saturation count rate, a linear correlation coefficient between the mean square current signal and the corrected count rate is maximized to determine a dead time corrected saturation count rate; Recalculating the mean square current signal and the gain coefficient of the AC mode using a linear regression equation based on the dead time corrected saturation count, so that the output current of the pulse mode and the output current of the AC mode overlap in the first overlapping interval; The first overlapping interval current is calculated, and the current relative deviation is adjusted according to the output current in the pulse mode, the output current in the AC mode, and the first overlapping interval current, so that the current relative deviation is less than a preset system alarm value.

3. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 2, characterized in that: The method of adjusting the saturation count rate so as to maximize the linear correlation coefficient between the mean square current signal and the corrected count rate to determine the dead time corrected saturation count rate comprises: converting the filtered count rate to the corrected count rate via the saturated count rate; Perform a linear fitting calculation based on the mean square error current signal and the corrected count rate to obtain the linear correlation coefficient; The saturation count rate is adjusted to select the saturation count rate corresponding to the maximum linear relative coefficient to obtain the dead time corrected saturation count rate.

4. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 3, characterized in that: The saturation count based on the dead time correction uses a linear regression equation to recalculate the mean square current signal and the gain coefficient of the AC mode so that the output current of the pulse mode and the output current of the AC mode overlap in the first overlapping interval, including: Calculate the output current of the pulse mode and the output current of the AC mode according to the dead time corrected saturated count rate, the gain coefficient of the pulse mode, the mean square current signal and the gain coefficient of the AC mode to obtain a first output current and a second output current; If the second output current corresponding to the saturation point of the pulse mode is less than the upper limit value of the first overlapping interval, adjusting the gain coefficient of the pulse mode so that the second output current corresponding to the saturation point of the pulse mode is greater than the upper limit value of the first overlapping interval; The linear regression equation is used to recalculate the mean square current signal and the gain coefficient of the AC mode, so that the new first output current and the new second output current overlap in the first overlapping interval.

5. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 4, characterized in that: The recalculating the mean square current signal and the gain coefficient of the AC mode by using the linear regression equation so that the adjusted first output current and the second output current overlap in the first overlapping interval includes: Performing a linear fitting calculation on the first output current and the second output current to obtain a first slope and a first intercept; Calculating a first compensation value and a first gain coefficient of the AC mode according to the first slope and the first intercept; The first output current and the second output current are adjusted by using the first compensation value and the first gain coefficient, so that the adjusted first output current and the second output current overlap in the first overlapping interval.

6. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 2, characterized in that: The first overlapping interval current is calculated by a first preset formula, where the first preset formula is: Among them, I Pulse_AC is the first overlapping interval current, I AC is the output current of the AC mode, I Pulse is the output current of the pulse mode, Klow1 and Khigh1 are the lower limit and upper limit of the first overlapping interval respectively.

7. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 5, characterized in that: The first compensation value and the first gain coefficient of the AC mode are calculated by a second preset formula, where the second preset formula is: Among them, I AC，new is the adjusted second output current, I AC is the output current of the AC mode, I Pulse is the output current of the pulse mode, AC offset,new is the first compensation value, G AC,new is the first gain coefficient, AC offset is the compensation value of the AC mode, G AC is the gain coefficient of the AC mode, k is the first slope and b is the first intercept, G AC,Old is the previous gain factor of the AC mode, AC offset,old is the previous compensation value in AC mode.

8. The method for linearly adjusting the overlap of fission chamber working modes according to any one of claims 1 to 7, characterized in that: The original signal also includes the current output current of the AC mode and the output current of the DC mode; and adjusting the compensation value and the gain coefficient of the DC mode according to the original signal so as to make the AC mode and the DC mode linearly fit in the second overlapping interval, including: For each fission chamber channel, selecting a corresponding fitting data segment based on the current output current in the AC mode and the output current in the DC mode according to a second preset data selection principle; Adjusting the compensation value and the gain coefficient of the DC mode based on a linear regression equation so that the current output current of the AC mode and the output current of the DC mode overlap within the second overlapping interval; The target current relative deviation in the second overlapping interval is calculated so that the target current relative deviation is less than a preset system alarm value.

9. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 8, characterized in that: The step of adjusting the compensation value and the gain coefficient of the DC mode based on the linear regression equation so that the current output current of the AC mode and the output current of the DC mode overlap within the second overlapping interval includes: Calculating a second slope and a second intercept based on the current output current in the AC mode and the output current in the DC mode through a linear regression equation; Calculate a second compensation value and a second gain coefficient according to the second slope, the second intercept, the compensation value and the gain coefficient of the DC mode; The current output current in the AC mode and the output current in the DC mode are adjusted according to the second compensation value and the second gain coefficient, so that the adjusted current output current in the AC mode and the output current in the DC mode overlap in the second overlapping interval.

10. The method for adjusting the overlap linearity of the fission chamber working modes according to claim 8, characterized in that: The calculating the target current relative deviation in the second overlapping interval so that the target current relative deviation is less than a preset system alarm value includes: Calculate the current in the second overlapping interval according to the current output current in the AC mode and the output current in the DC mode to obtain the overlapping interval current; Calculating the target current relative deviation according to the overlapping interval current, the current output current of the AC mode, and the output current of the DC mode; If the target current relative deviation is not less than the preset system alarm value, return to select the fitting data segment to recalculate a new target current relative deviation until the new target current relative deviation is less than the preset system alarm value.

11. The method for linearly adjusting the overlap of fission chamber working modes according to any one of claims 1 to 7, characterized in that: The method of collecting the original signals of the pulse mode, the AC mode and the DC mode of the fission chamber detector according to the preset parameters includes: The original signals of the pulse mode, AC mode and DC mode of the fission chamber detector are collected according to preset parameters during the process of increasing the core neutron flux or the reactor power, until the original signals reach the upper limit values ​​of each overlapping interval.

12. A fission chamber operating mode overlap linear adjustment device, characterized in that: include: The original signal acquisition module is used to acquire the original signals of the pulse mode, AC mode and DC mode of the fission chamber detector according to preset parameters; A first linear adjustment module, used for adjusting the saturation count rate and gain coefficient of the pulse mode, the compensation value and gain coefficient of the AC mode according to the original signal, so as to make the pulse mode and the AC mode linearly fit in the first overlapping interval; A second linear adjustment module, used for adjusting the compensation value and the gain coefficient of the DC mode according to the original signal, so as to make the AC mode and the DC mode linearly fit in the second overlapping interval; The linearity verification module is used to verify the linearity of the output current in each overlapping interval and the consistency between channels, and transmit the verified parameter settings to the nuclear instrument system.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for linearly adjusting the overlapping fission chamber working modes according to any one of claims 1 to 7 is implemented.

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