CN117075183A - Neutron detector fault on-line monitoring method, system, storage medium and terminal - Google Patents
Neutron detector fault on-line monitoring method, system, storage medium and terminal Download PDFInfo
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Abstract
The invention relates to a neutron detector fault on-line monitoring method, a neutron detector fault on-line monitoring system, a storage medium and a terminal, which comprise the following steps: collecting delay compensated current of all self-powered neutron detectors in the stack; calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector; grouping all self-powered neutron detectors in the stack to obtain all symmetrical groups; calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group; and performing fault monitoring of the in-pile self-energy neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups. The invention can monitor the self-powered neutron detector in real time and output a fault alarm signal when a fault occurs so as to remind related personnel to carry out check processing, avoid false triggering or refusal triggering of core key parameter monitoring alarm and ensure the accuracy of core key parameters and the safety of the core.
Description
Technical Field
The invention relates to the technical field of instrument detection, in particular to a neutron detector fault on-line monitoring method, a neutron detector fault on-line monitoring system, a storage medium and a terminal.
Background
In the third generation nuclear power unit, a self-powered neutron detector (SPND) is widely used for a nuclear detection system in a reactor, so that the reactor core power distribution and the core key parameters of the reactor are monitored in real time. Rhodium-103 self-powered neutron detector, which is also called delayed response self-powered neutron detector, and the emitter material rhodium-103 captures neutrons to form short-life beta radioactive isotope rhodium-104; the activated emitter emits high-energy electron flow in the beta decay process, and the neutron current formed by the electron flow between the electrodes after delay compensation and gamma compensation is proportional to the neutron flux at the core position of the detector. The SPND neutron current signal is used to reconstruct the core power distribution and calculate core critical parameters including component power bias, axial power offset, line Power Density (LPD), off-nuclear boiling ratio, etc., which are critical to monitoring reactor core safety, preventing fuel cladding damage. When the SPND and the transmission and processing chain thereof are failed or damaged, the SPND current signal cannot truly reflect neutron flux at the position of the reactor core, so that the calculation precision of the key parameters of the reactor core exceeds the design requirement, and further, the key parameter monitoring alarm is triggered by mistake or is refused to trigger.
The current detection method for SPND mainly adopts an LPD cross comparison mode calculated by the same-layer SPND, and specifically comprises the following steps: calibrating the LPD calculated by the SPND by using a mobile neutron measurement system, and calibrating the same height SPND LPD as the maximum LPD measured by the mobile neutron measurement system; the LPD calculated by each SPND at the same height is changed along with the power change at the position of the reactor core, and if the deviation between the LPD calculated by a certain SPND and the comparison of the same layer is too large, the SPND and the transmission and processing chain thereof are considered to have faults or the local power of the reactor core is considered to have abnormality.
In the existing mode, a rhodium-103 self-powered neutron detector is adopted to reconstruct the power distribution of the reactor core and calculate the critical parameters of the reactor core in real time, the on-line monitoring function of the SPND current faults is lacking, if the SPND and a transmission and processing chain thereof are faulty or damaged, the SPND current signals cannot truly reflect the neutron flux of the reactor core position, the calculation accuracy of the critical parameters of the reactor core exceeds the design requirement, the critical parameter monitoring alarm is possibly caused to be triggered by mistake or refused to be triggered, and the accuracy of the critical parameters of the reactor core and the safety of the reactor core cannot be ensured.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-line monitoring method, a system, a storage medium and a terminal for faults of a neutron detector.
The technical scheme adopted for solving the technical problems is as follows: a method for on-line monitoring faults of a neutron detector is constructed, which comprises the following steps:
collecting delay compensated current of all self-powered neutron detectors in the stack;
calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector;
grouping all self-powered neutron detectors in the stack to obtain all symmetrical groups;
calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group;
and performing fault monitoring of the in-pile self-energy neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups.
In the method for monitoring faults of neutron detectors in an online manner, the calculating according to the delay compensated current of each self-powered neutron detector includes:
calculating according to the delay compensated current of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector;
and calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector.
In the method for monitoring faults of neutron detectors in an online manner, the calculating according to the delay compensated current of each self-powered neutron detector, the obtaining the burnup correction factor of each self-powered neutron detector comprises the following steps:
respectively carrying out charge accumulation on the delay compensated current of each self-powered neutron detector to obtain accumulated charge of each self-powered neutron detector;
and calculating according to the accumulated charge of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector.
In the method for monitoring faults of neutron detectors in an online manner, the calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector comprises the following steps:
the delay compensated current of each self-powered neutron detector is differenced with the gamma current in the output current of the self-powered neutron detector, and the current of each self-powered neutron detector which is not corrected by burnup is obtained;
and (3) multiplying the current of each self-powered neutron detector without burnup correction by a burnup correction factor of the current of each self-powered neutron detector to obtain the neutron current of each self-powered neutron detector.
In the method for monitoring faults of neutron detectors in an online manner, the calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector comprises the following steps:
and (3) the delay compensated current of each self-powered neutron detector is used as a burnup correction factor to obtain the neutron current of each self-powered neutron detector.
In the method for on-line monitoring of faults of neutron detectors of the present invention, the grouping of all self-powered neutron detectors in a stack to obtain all symmetric groups includes:
all self-powered neutron detectors in the stack are grouped according to 180-degree rotation symmetry of the height, and all symmetrical groups are obtained.
In the method for monitoring faults of neutron detectors on line, the fault monitoring of the in-pile self-powered neutron detectors according to the symmetrical deviation monitoring of all symmetrical groups comprises the following steps:
comparing the symmetry deviation of each symmetry group with a symmetry deviation threshold value to obtain a comparison signal of each symmetry group;
and carrying out logic judgment according to all the comparison signals, and outputting an asymmetric comprehensive fault alarm signal.
In the method for on-line monitoring of faults of the neutron detector, the method further comprises the following steps:
storing the delay compensated current, the neutron current, the symmetric deviation and the asymmetric fault signal.
In the method for on-line monitoring of faults of the neutron detector, the method further comprises the following steps:
and displaying the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal.
The invention also provides an on-line monitoring system for neutron detector faults, which comprises:
the parameter acquisition unit is used for acquiring delay compensated current of all self-powered neutron detectors in the pile;
the neutron current calculation unit is used for calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector;
the grouping unit is used for grouping all self-powered neutron detectors in the pile to obtain all symmetrical groups;
a symmetry deviation calculation unit for calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group;
the fault monitoring unit is used for monitoring faults of the in-pile self-powered neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups;
the storage unit is used for storing the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal;
and the display unit is used for displaying the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal.
In the neutron detector fault on-line monitoring system of the present invention, the neutron current calculation unit includes:
the burnup correction factor calculation module is used for calculating according to the delay compensated current of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector;
and the neutron current calculation module is used for calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector.
In the neutron detector fault on-line monitoring system of the present invention, the burnup correction factor calculation module includes:
the charge accumulation module is used for respectively carrying out charge accumulation on the delay compensated current of each self-powered neutron detector to obtain accumulated charge of each self-powered neutron detector;
and the correction factor calculation module is used for calculating according to the accumulated charge of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector.
In the neutron detector fault on-line monitoring system of the present invention, the fault monitoring unit includes:
the threshold comparison module is used for comparing the symmetrical deviation of each symmetrical group with a symmetrical deviation threshold value to obtain a comparison signal of each symmetrical group;
and the logic judgment module is used for carrying out logic judgment according to all the comparison signals and outputting an asymmetric comprehensive fault alarm signal.
In the neutron detector fault on-line monitoring system of the invention, the system further comprises:
and the storage unit is used for storing the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal.
In the neutron detector fault on-line monitoring system of the invention, the system further comprises:
and the display unit is used for displaying the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal.
The invention also provides a storage medium storing a computer program adapted to be loaded by a processor to perform the steps of the neutron detector fault on-line monitoring method as described above.
The invention also provides a terminal, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the neutron detector fault on-line monitoring method by calling the computer program stored in the memory.
The neutron detector fault on-line monitoring method, the system, the storage medium and the terminal have the following beneficial effects: the method comprises the following steps: collecting delay compensated current of all self-powered neutron detectors in the stack; calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector; grouping all self-powered neutron detectors in the stack to obtain all symmetrical groups; calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group; and performing fault monitoring of the in-pile self-energy neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups. The invention can monitor the self-powered neutron detector in real time and output a fault alarm signal when a fault occurs so as to remind related personnel to carry out check processing, avoid false triggering or refusal triggering of core key parameter monitoring alarm and ensure the accuracy of core key parameters and the safety of the core.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of the radial distribution of self-powered neutron detectors of a three-generation nuclear power unit provided by the invention;
FIG. 2 is a schematic flow chart of an online monitoring method for faults of a neutron detector;
FIG. 3 is a schematic diagram of an on-line monitoring system for neutron detector faults.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the third generation nuclear power unit, self-powered neutron detectors (SPND, a detector capable of detecting neutrons without an external power supply) are all arranged in a 180-degree rotationally symmetrical radial mode (as shown in figure 1), 6-7 SPND are sequentially arranged at each radial position in the axial direction, and the heights of the detectors at the same layer at each radial position are consistent.
The radial inclination of the reactor core is limited to a certain smaller range by the reactor core design requirement, for example, the radial inclination of a certain nuclear power unit is required to be not more than 2% at full power, and if the radial inclination of the reactor core exceeds a preset range, the existing reactor safety analysis is not credible. Therefore, the numerical difference of neutron current of SPND at highly symmetrical positions should be small under normal conditions; since the SPND sensitivity decreases with the consumption of rhodium-103, that is, the SPND current decreases continuously, it is necessary to correct the burn-up of the SPND current. Based on the above, the invention provides an on-line monitoring method for faults of the self-powered rhodium neutron detector in the reactor (namely, the on-line monitoring method for faults of the neutron detector) based on the symmetry of neutron current, and the burnup correction of the current is considered.
Specifically, as shown in fig. 2, in a preferred embodiment, the method for on-line monitoring of neutron detector faults includes the following steps:
step S201, collecting delay compensated current of all self-powered neutron detectors in the pile.
Specifically, in this embodiment, the current after delay compensation of all self-powered neutron detectors in the stack may be collected by using an existing method, and the present invention is not limited in particular.
Step S202, calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector.
In this embodiment, the neutron current of each self-powered neutron detector is proportional to the actual neutron flux at the core location.
Specifically, in this embodiment, calculating according to the delay compensated current of each self-powered neutron detector, obtaining the neutron current of each self-powered neutron detector includes: calculating according to the delay compensated current of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector; and calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector.
The method for obtaining the burnup correction factor of each self-powered neutron detector comprises the following steps of: respectively carrying out charge accumulation on the delay compensated current of each self-powered neutron detector to obtain accumulated charge of each self-powered neutron detector; and calculating according to the accumulated charge of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector.
In this embodiment, calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof, obtaining the neutron current of each self-powered neutron detector includes: the delay compensated current of each self-powered neutron detector is differenced with the gamma current in the output current of the self-powered neutron detector, and the current of each self-powered neutron detector which is not corrected by burnup is obtained; and (3) multiplying the current of each self-powered neutron detector without burnup correction by a burnup correction factor of the current of each self-powered neutron detector to obtain the neutron current of each self-powered neutron detector. Specifically, the gamma current in the output current of the self-powered neutron detector is subtracted from the delay compensated current to obtain the neutron current without burnup correction, and the calculated neutron current is divided by the burnup correction factor to obtain the neutron current of each self-powered neutron detector.
Alternatively, since the ratio of the gamma current to the delay-compensated current is generally small, and the theoretical gamma current ratio of the symmetrical position is the same, that is, the effect of the gamma current is limited, the calculation is performed according to the delay-compensated current and the burnup correction factor thereof for each self-powered neutron detector, and obtaining the neutron current for each self-powered neutron detector includes: and (3) the delay compensated current of each self-powered neutron detector is used as a burnup correction factor to obtain the neutron current of each self-powered neutron detector. The neutron current of each self-powered neutron detector can be obtained by directly dividing the delay compensated current of each self-powered neutron detector by the burnup correction factor.
For example, if there are k SPNDs in the stack, the delay compensated current of all the k SPNDs can be expressed as: i i ，i＝1，2，3，...，k。
For each I respectively i Charge accumulation is carried out to obtain accumulated charge Q of each SPND i . Wherein Q is i Can be calculated by the following formula:
Q i ＝∫I i (1)。
(1) In which Q i For the accumulated charge of the ith SPND, I i The post-compensation current is compensated for the delay of the ith SPND.
The fuel consumption correction factor of each SPND can be calculated by the accumulated charge of each SPND calculated by the formula (1). The burnup correction factor for each SPND can be calculated by the following equation:
S(Q i )＝f(Q i )＝(1-ηQ i ) ρ (2)。
(2) Wherein S (Q) i ) The burn-up correction factor is the ith SPND, eta is the length correction coefficient, and ρ is the fitting coefficient.
After the burnup correction factor of each SPND is calculated, the sub-current can be calculated according to the delay compensated current of each SPND and the corresponding burnup correction factor. The neutron current of each SPND can be calculated by the following formula:
I Sni ＝I i /S(Q i ) (3)。
(3) Wherein I is Sni Is the neutron current of the ith SPND.
Step S203, grouping all self-powered neutron detectors in the stack to obtain all symmetrical groups.
In this embodiment, grouping all self-powered neutron detectors in the stack, obtaining all symmetric groups includes: all self-powered neutron detectors in the stack are grouped according to 180-degree rotation symmetry of the height, and all symmetrical groups are obtained.
Specifically, in this step, all the SPNDs in the stack are grouped according to 180 ° rotation symmetry in height, so as to obtain all the symmetry groups. Specifically, as shown in fig. 1, the first SPND at the upper part of the K01 position is symmetrical with the first SPND at the upper part of the F15 position, and the two SPNDs are grouped into a symmetrical group; the upper second SPND for the K01 and F15 positions is symmetrical, grouped into another symmetry group, and so on.
Step S204, calculating the symmetry deviation of each symmetry group based on the neutron current of the self-energized neutron detector in each symmetry group.
In particular, the symmetry deviation of a symmetry group can be calculated from neutron currents of two SPND's in the symmetry group. Specifically, the method can be obtained by formal calculation:
Err ij ＝[max(I Sni ，I Sn j) - min(I Sni ，I Sn j)] / min(I Sni ，I Sn j) (4)。
(4) Wherein Err ij For symmetrical deviation, I Sni For the ith SPNNeutron current of D, I Sn j is the neutron current of the jth SPND.
Step S205, fault monitoring of the in-pile self-powered neutron detector is carried out according to the symmetrical deviation monitoring of all the symmetrical groups.
In this embodiment, the fault monitoring of the in-pile self-powered neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups includes: comparing the symmetry deviation of each symmetry group with a symmetry deviation threshold value to obtain a comparison signal of each symmetry group; and carrying out logic judgment according to all the comparison signals, and outputting an asymmetric comprehensive fault alarm signal.
Specifically, the symmetrical deviation Err ij Compared with the symmetrical deviation threshold, if the symmetrical deviation Err ij Greater than the symmetrical deviation threshold, an asymmetrical comprehensive fault alarm signal (asym is used ij Denoted by 1), otherwise asym ij Is 0. The symmetrical deviation threshold is a preset value, the value of the symmetrical deviation threshold is the superposition of measurement uncertainty of current after envelope delay compensation, calculation uncertainty of burnup correction, allowable radial inclination of a reactor core and SPND initial sensitivity deviation, and the value is smaller than the minimum allowance of a core key parameter monitored by a core testing system during normal operation of the reactor core, if the minimum allowance of a core key parameter of a certain nuclear power unit is 13%, the symmetrical deviation threshold is smaller than 0.13 and generally not more than 0.10.
K/2 asymmetrical comprehensive fault alarm signals of k SPND calculated in step S204 are calculated for k/2 asymmetrical comprehensive fault alarm signals asym ij Taking a logical OR, if the result is a 1, then it indicates that one or more pairs of SPND asymmetry fault signals are present.
Further, in this embodiment, the method for online monitoring a fault of a neutron detector further includes: and storing the delay-compensated current, neutron current, symmetrical deviation and asymmetrical fault signals. Specifically, in this embodiment, the delay-compensated current, the accumulated charge, the burnup correction factor, the neutron current, the symmetrical deviation, the asymmetrical signal (switching amount), and the asymmetrical integrated fault warning signal (switching amount) may be stored.
Further, in this embodiment, the method for online monitoring a fault of a neutron detector further includes: and displaying the delay-compensated current, neutron current, symmetrical deviation and asymmetrical fault signals. Specifically, in this embodiment, the delay-compensated current, the accumulated charge, the burnup correction factor, the neutron current, the symmetrical deviation, the asymmetrical signal (switching amount), and the asymmetrical integrated fault warning signal (switching amount) may be displayed.
Referring to fig. 3, the present invention provides an on-line monitoring system for faults of a neutron detector, which can be applied to the on-line monitoring method for faults of a neutron detector disclosed in the embodiment of the present invention.
Specifically, as shown in fig. 3, the neutron detector fault on-line monitoring system includes:
and the parameter acquisition unit 11 is used for acquiring delay compensated current of all self-powered neutron detectors in the pile.
The neutron current calculation unit 12 is configured to calculate a neutron current of each self-powered neutron detector according to the delay compensated current of each self-powered neutron detector.
In the present embodiment, the neutron current calculation unit 12 includes: the burnup correction factor calculation module 121 is configured to calculate, according to the delay compensated current of each self-powered neutron detector, a burnup correction factor of each self-powered neutron detector; the neutron current calculation module 122 is configured to calculate a neutron current of each self-powered neutron detector according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof.
Wherein, the burnup correction factor calculation module 121 includes: a charge accumulating module 1211, configured to accumulate charges of the delay compensated current of each self-powered neutron detector, so as to obtain accumulated charges of each self-powered neutron detector; the correction factor calculation module 1212 is configured to calculate a burnup correction factor for each self-powered neutron detector according to the accumulated charge of each self-powered neutron detector.
A grouping unit 13, configured to group all self-powered neutron detectors in the stack to obtain all symmetric groups.
A symmetry deviation calculation unit 14 for calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group.
And the fault monitoring unit 15 is used for monitoring faults of the in-pile self-powered neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups.
In the present embodiment, the failure monitoring unit 15 includes: the threshold value comparing module 151 compares the symmetry deviation of each symmetry group with a symmetry deviation threshold value to obtain a comparison signal of each symmetry group; the logic judgment module 152 is configured to perform logic judgment according to all the comparison signals and output an asymmetric comprehensive fault alarm signal.
Further, in this embodiment, the neutron detector fault online monitoring system further includes: and a storage unit 16 for storing the delay-compensated current, neutron current, symmetric deviation and asymmetric fault signal.
Further, in this embodiment, the neutron detector fault online monitoring system further includes: and a display unit 17 for displaying the delay-compensated current, neutron current, symmetric deviation and asymmetric fault signal.
Further, in this embodiment, the neutron detector fault online monitoring system further includes: a parameter setting unit 18, the parameter setting unit 18 being configured to set the length correction coefficient η, the fitting coefficient ρ and the symmetry-deviation threshold.
Specifically, the specific cooperation operation process between each unit in the neutron detector fault online monitoring system may refer to the above neutron detector fault online monitoring method, which is not described herein again.
In addition, the terminal comprises a memory and a processor; the memory is used for storing a computer program; the processor is used for executing a computer program to realize the neutron detector fault online monitoring method according to any one of the above. In particular, according to embodiments of the present invention, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such an embodiment, the computer program may perform the above-described functions defined in the method of the embodiment of the present invention when downloaded and installed and executed by the terminal. The terminal in the invention can be a notebook, a desktop, a tablet computer, a smart phone and other terminals, and can also be a server.
In addition, a storage medium of the present invention has a computer program stored thereon, which when executed by a processor, implements the neutron detector fault on-line monitoring method of any one of the above. In particular, it should be noted that the storage medium of the present invention may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to:
electrical wires, fiber optic cables, RF (radio frequency), and the like, or any suitable combination of the foregoing.
The computer readable medium may be contained in the terminal; or may exist alone without being fitted into the terminal.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (15)
1. The on-line monitoring method for the faults of the neutron detector is characterized by comprising the following steps of:
collecting delay compensated current of all self-powered neutron detectors in the stack;
calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector;
grouping all self-powered neutron detectors in the stack to obtain all symmetrical groups;
calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group;
and performing fault monitoring of the in-pile self-energy neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups.
2. The method of claim 1, wherein the calculating based on the delay compensated current of each self-powered neutron detector to obtain the neutron current of each self-powered neutron detector comprises:
calculating according to the delay compensated current of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector;
and calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector.
3. The method of claim 2, wherein the calculating based on the delay compensated current of each self-powered neutron detector to obtain the burnup correction factor for each self-powered neutron detector comprises:
respectively carrying out charge accumulation on the delay compensated current of each self-powered neutron detector to obtain accumulated charge of each self-powered neutron detector;
and calculating according to the accumulated charge of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector.
4. The method of claim 2, wherein the calculating based on the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector comprises:
the delay compensated current of each self-powered neutron detector is differenced with the gamma current in the output current of the self-powered neutron detector, and the current of each self-powered neutron detector which is not corrected by burnup is obtained;
and (3) multiplying the current of each self-powered neutron detector without burnup correction by a burnup correction factor of the current of each self-powered neutron detector to obtain the neutron current of each self-powered neutron detector.
5. The method of claim 2, wherein the calculating based on the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector comprises:
and (3) the delay compensated current of each self-powered neutron detector is used as a burnup correction factor to obtain the neutron current of each self-powered neutron detector.
6. The method of claim 1, wherein grouping all self-powered neutron detectors in a stack to obtain all symmetric groups comprises:
all self-powered neutron detectors in the stack are grouped according to 180-degree rotation symmetry of the height, and all symmetrical groups are obtained.
7. The method of claim 1, wherein the fault monitoring of the in-pile self-powered neutron detector according to the symmetry deviation monitoring of all symmetry groups comprises:
comparing the symmetry deviation of each symmetry group with a symmetry deviation threshold value to obtain a comparison signal of each symmetry group;
and carrying out logic judgment according to all the comparison signals, and outputting an asymmetric comprehensive fault alarm signal.
8. The method of on-line monitoring of neutron detector faults of claim 1, further comprising:
storing the delay compensated current, the neutron current, the symmetric deviation and the asymmetric fault signal.
9. The method of on-line monitoring of neutron detector faults of claim 1, further comprising:
and displaying the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal.
10. A neutron detector fault on-line monitoring system, comprising:
the parameter acquisition unit is used for acquiring delay compensated current of all self-powered neutron detectors in the pile;
the neutron current calculation unit is used for calculating according to the delay compensated current of each self-powered neutron detector to obtain neutron current of each self-powered neutron detector;
the grouping unit is used for grouping all self-powered neutron detectors in the pile to obtain all symmetrical groups;
a symmetry deviation calculation unit for calculating a symmetry deviation for each symmetry group based on neutron currents of the self-powered neutron detectors in each symmetry group;
the fault monitoring unit is used for monitoring faults of the in-pile self-powered neutron detector according to the symmetrical deviation monitoring of all the symmetrical groups;
the storage unit is used for storing the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal;
and the display unit is used for displaying the delay compensated current, the neutron current, the symmetrical deviation and the asymmetrical fault signal.
11. The neutron detector fault on-line monitoring system of claim 10, wherein the neutron current calculation unit comprises:
the burnup correction factor calculation module is used for calculating according to the delay compensated current of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector;
and the neutron current calculation module is used for calculating according to the delay compensated current of each self-powered neutron detector and the burnup correction factor thereof to obtain the neutron current of each self-powered neutron detector.
12. The neutron detector fault online monitoring system of claim 11, wherein the burnup correction factor calculation module comprises:
the charge accumulation module is used for respectively carrying out charge accumulation on the delay compensated current of each self-powered neutron detector to obtain accumulated charge of each self-powered neutron detector;
and the correction factor calculation module is used for calculating according to the accumulated charge of each self-powered neutron detector to obtain the burnup correction factor of each self-powered neutron detector.
13. The neutron detector fault on-line monitoring system of claim 10, wherein the fault monitoring unit comprises:
the threshold comparison module is used for comparing the symmetrical deviation of each symmetrical group with a symmetrical deviation threshold value to obtain a comparison signal of each symmetrical group;
and the logic judgment module is used for carrying out logic judgment according to all the comparison signals and outputting an asymmetric comprehensive fault alarm signal.
14. A storage medium storing a computer program adapted to be loaded by a processor to perform the steps of the neutron detector fault on-line monitoring method of any of claims 1 to 9.
15. A terminal comprising a memory and a processor, wherein the memory stores a computer program, and the processor performs the steps of the neutron detector fault on-line monitoring method according to any one of claims 1 to 9 by calling the computer program stored in the memory.
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