CN106024078B - A kind of method of diagnostic reaction pile neutron detector failure - Google Patents
A kind of method of diagnostic reaction pile neutron detector failure Download PDFInfo
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- CN106024078B CN106024078B CN201610471993.XA CN201610471993A CN106024078B CN 106024078 B CN106024078 B CN 106024078B CN 201610471993 A CN201610471993 A CN 201610471993A CN 106024078 B CN106024078 B CN 106024078B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/108—Measuring reactor flux
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/02—Devices or arrangements for monitoring coolant or moderator
- G21C17/04—Detecting burst slugs
- G21C17/044—Detectors and metering devices for the detection of fission products
- G21C17/047—Detection and metering circuits
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
A kind of method of diagnostic reaction pile neutron detector failure, failure diagnosis are carried out by comparison method, measured value the direct comparison method detector measurement value, measured value with response reconstruction value comparison method point three phases to detector measurement value；The combined use of three kinds of judgment modes causes detector failure diagnosis method described in the invention not only can carry out efficient diagnosis entirely ineffective to detector, Accurate Diagnosis can be made to the failure that detector measurement value deviates normal value simultaneously, and possesses the ability for distinguishing detector failure and local power oscillations；By removing failure detection device measured value, it is ensured that core power is distributed on-line monitoring system without using fault detector measured value, and reliable input parameter is provided for on-line monitoring system；Detector failure diagnosis method is not limited by type photodetector, on-line monitoring method, detector failure type in the present invention, and the failure diagnosis used time is short, diagnose rapid, diagnostic result accurately and reliably.
Description
Technical field
The present invention relates to nuclear reactor operation and security technology area, and in particular to a kind of diagnostic reaction pile neutron is visited
The method for surveying device failure.
Background technology
In order to ensure the safety of reactor core, the economic benefit of raising reactor, it is necessary to reactor core power point
Cloth is monitored on-line.Continuous monitoring i.e. to the reactor capability distribution progress time and spatially.Because power distribution is difficult
Directly monitor, nuclear power plant is typically distributed by monitoring heap in-core netron-flux density come indirect monitoring heap internal power.
Most reactors are used to equipped with neutron measurement system (heap internally-fixed detector or packaged type detector) in heap
Monitor netron-flux density in heap；Also reactor is realized using out-pile neutron measurement system (out-pile neutron detector) in heap
The monitoring of neutron flux.Be compared to that ex-core detector measuring point is few, precision it is relatively low easily by the characteristics of external disturbance and can in heap
The characteristics of movin gdetector continuously can not provide metrical information, heap internally-fixed detector is believed with its higher precision and measurement
The features such as continuity of breath, is increasingly widely applied, and is used in reactor capability distribution on-line monitoring.
The true of detector measurement value has important influence with accurate for core power distribution on-line monitoring.And detector
Failure be the situation often occurred in a class reactor, especially for heap internally-fixed detector, its long-time is in height
Under radiation parameter, failure probability increases.Therefore, three-dimensional core power distribution on-line monitoring meter is being carried out using detector measurement value
During calculation, the failure diagnosis carried out to detector are very necessary.
Detector failure of removal typically has following a few classes：It is entirely ineffective, i.e. detector non-metering；Droop fails, i.e.,
Failure detection device measured value and normal value have the deviation of a fixed constant；Signal drift, i.e. detector measurement value have with normal value
One deviation changed linearly over time；Variance changes within the specific limits for precise decreasing, i.e. measured value.At present, for heap
Core power distribution on-line monitoring system, detector measurement value is carried for input signal as its input signal, systems most
Self-checking function, but the detection is typically only capable to respond when occurring entirely ineffective for detector, and can not detect detection
Other kinds of failure occurs for device.Accordingly, it would be desirable to invent a kind of method of fast and reliable diagnostic processor failure.
The content of the invention
In order to overcome the problem of above-mentioned prior art is present, it is an object of the invention to provide a kind of diagnostic reaction pile neutron
The method of detector failure, in being calculated applied to core power on-line monitoring, compares and surveys by directly comparing, between measured value
Value is compared triphasic judgement with reconstruction value, and enabling on-line monitoring system, rapidly diagnostic processor measured value whether there is
It is abnormal, and ensure in on-line monitoring system without using being diagnosed to be abnormal detector measurement value.
To achieve these goals, it is practiced present invention employs following technical scheme：
A kind of method of diagnostic reaction pile neutron detector failure, comprises the following steps：
Step 1：Read reactor core physical dimension, reactor core material arrangement, detector total number, probe access number
Mesh, detector title；
Step 2：Neutron detector measured value and detector position are read at the neutron detector of reactor in-core；Root
According to detector total number in step 1, judge whether detector measurement value number is equal to detector total number, if being equal to, under progress
One step；If being not equal to, according to the detector position for not reading detector measurement value, failure detection device title is determined；
Step 3：Whether according to the detector measurement value read in step 2, it is 0 value or negative value to judge each measured value,
If 0 value or negative value, then remove the value；One group of detector measurement value for removing 0 value or negative value is obtained, is referred to as, is failed for the first time
Detector measurement value after diagnosis；
Step 4：On the basis of the detector measurement value after first time failure diagnosis in step 3, judge that each is detected
Whether device measured value exceeds M times or 1/M times of the average value of all measured values, wherein M>1, if exceeding, remove the value；Obtain
One group remove M times or 1/M times of the average value beyond all measured values detector measurement value, be referred to as, after second of failure diagnosis
Detector measurement value；M selection is different according to different reactor core types, different type photodetectors, is made by oneself by user
Justice；
Step 5：It is several according to reactor core is read in the detector measurement value and step 1 after second of failure diagnosis in step 4
What size, reactor core material arrangement parameter, carries out core power and is distributed online monitoring calculation and the calculating of explorer response reconstruction value；
Step 6：Online monitoring calculation result is distributed according to core power in step 5, one group of explorer response reconstruct is obtained
Value combines the detector measurement value of gained in step 3, carries out detector measurement value to the detector of all positions and detector rings
The relative error of reconstruction value is answered to calculate；Calculation formula is：
Step 7：The relative error of all detector positions according to obtained by step 6, judges explorer response reconstruction value and spy
Survey whether device measured value relative error is more than N%, wherein N>10, if being more than, remove the detector measurement value；One group is obtained to go
The detector measurement value that explorer response reconstruction value is more than N% with detector measurement value relative error is fallen, has been referred to as, by the 3rd
Detector measurement value after secondary failure diagnosis；N value is relevant with heap-type, type photodetector, by User Defined；
Step 8：According to the detector measurement value obtained in step 7, the calculating of step 5, step 6 and step 7 is carried out again,
Until no longer occurring new failure detection device in the judgement of step 7；
Step 9：According to step 8, output detector failure diagnosis result, and core power are distributed online monitoring calculation knot
Really, explorer response value result of calculation.
Compared with prior art, the present invention has following outstanding advantages：
1. detector failure diagnosis provide reliable input parameter for reactor core power distribution on-line monitoring, not only may be used
To be diagnosed to be the entirely ineffective failure of detector, the failure that detector deviates normal value can also be diagnosed to be.
2. being distributed on-line monitoring system with reference to core power, failure detection device measured value is correctly handled, it is ensured that heap
Core on-line monitoring system carries out the reconstruct of power distribution without using fault detector measured value.
3. carrying self-checking function for detector failure diagnosis, detector failure and reactor core partial power can be distinguished
The operation characteristic such as reduction or rise.
4. the detector failure diagnosis used time is short, diagnosis is rapid, is that core power distribution on-line monitoring system realizes real-time prison
Survey provides safeguard.
Brief description of the drawings
Fig. 1 is detector failure diagnosis flow chart.
Fig. 2 is core power distribution on-line monitoring system flow chart.
Fig. 3 is harmonic expansion method on-line monitoring flow chart.
Detector measurement value when Fig. 4 is axially the 10th detector failure.
Detector measurement value and reconstruction value when Fig. 5 is axially the 10th detector failure.
Fig. 6 is the axial partial power's reduction detector measurement value of reactor core.
Embodiment
Detector failure diagnosis flow chart is as shown in Figure 1.As illustrated, the diagnosis process of detector failure is not only occurred on
Core power is distributed before online monitoring calculation, i.e., detector measurement value is individually directly compared judgement, measured value, be online
Monitoring provides reliable input signal；Also occur in on-line monitoring calculating process, i.e., measured value is compared with reconstruction value, by detector
Failure diagnosis calculate mutual iteration with on-line reorganization power distribution and carried out, also while examining during the diagnosis failed to detector
The contact between prml detector measured value is considered so that detector failure diagnosis fail and the local work(of reactor core with detector is distinguished
The function of rate vibration.
Specific implementation method includes following aspect：
1. read reactor core physical dimension, reactor core material arrangement, detector total number, probe access number, spy
Survey device title；
2. detector measurement value and neutron detector position are read at the neutron detector of reactor in-core；According to step
Detector total number in rapid 1, judges whether detector measurement value number is equal to detector total number, if being equal to, and carries out next step；
If being not equal to, according to the detector position for not reading detector measurement value, failure detection device title is determined.
3. according to data are read in step 2, first time failure diagnosis are carried out to detector measurement value, each detector is surveyed
Value does independent judgement, and whether judge detector measurement value is 0 or negative value, because neutron detector is logical to neutron in heap in heap
Amount is responded, therefore is not in 0 value or negative value；If occurring at the situation of 0 value or negative value, the system automatic rejection position
Detector measurement information, obtain the detector measurement value after first time failure diagnosis.
4. second of failure diagnosis is carried out to detector measurement value, entered on the basis of gained detector measurement value in step 3
Compare between row measured value, judge detector measurement value whether beyond M times or 1/M times of average value of measurement, wherein M>1, due in heap
Neutron flux is in certain scope, therefore detector measurement value also should be in certain scope, seriously beyond average value
(excessive or too small) can determine that fails for detector.If there is the detector measurement value beyond M times or 1/M times of average value,
The value is removed, the detector measurement value after second of failure diagnosis is obtained.M selection is according to different reactor core types, different spies
Device type is surveyed different, by User Defined.
5. the reactor core physical dimension and material arrangement according to being read in gained detector measurement value in step 4 and step 1 are joined
Number, carries out core power and is distributed online monitoring calculation and the calculating of explorer response reconstruction value.
6. according to step 5 gained explorer response reconstruction value, and gained detector measurement value in step 3, visited to all
The relative error calculating that device position carries out detector measurement value and explorer response reconstruction value is surveyed, calculation formula is：
7. according to step 6 gained detector measurement value and reconstruction value relative error, third time is carried out to detector measurement value
Failure diagnosis, measure the comparison of value and reconstruction value, judge detector measurement value and the detection obtained after once reconstructing
Whether device reconstruction value relative error is more than N%, wherein, N>10, if there is the excessive situation of relative error, reject at the position
Detector measurement value, obtain the detector measurement value after third time failure diagnosis.N value and heap-type, detector class
Type is relevant, can be by User Defined.
8. according to the effective detector measurement value obtained in step 7, the calculating of step 5, step 6 and step 7 is carried out again,
Until no longer occurring new failure detection device in the judgement of step 7；
9. according to step 8, the detector failure diagnosis result after all detector failure diagnosis steps is exported, and adopt
Online monitoring calculation result, explorer response value are distributed with the core power eliminated after all failure detection device measured values to calculate
As a result.
In the present invention, placement information of the detector in reactor core is read in by step 1, according to the detection read in step 1
Device positional information does preliminary judgement to the detector measurement value in step 2, obtains the detection without return detector measured value
Device position.
Measured value after the first time failure diagnosis obtained in step 3 is unreasonable to be eliminated on the basis of initial measurement
0 value or negative value after measured value.Measured value after second of the failure diagnosis obtained in step 4 is after first time diagnoses
On the basis of measured value, remove the serious measurement beyond measurement average value and be worth to.In deterministic process, if certain in heap occurs for reactor core
The power of position is quickly raised, then detector measurement value now near the position also equally can be raised quickly, or even beyond spy
Survey device measurement average value.To prevent from producing the erroneous judgement for failing to detector in the case, the present invention is proposed is to detector
The secondary diagnostic method of no failure, i.e., in step 6, the detector measurement value for being compared with detector reconstruction value are in step
Measured value after the first time failure diagnosis obtained in 3.Such purpose is, is monitored on-line using being distributed by core power
Second of failure diagnosis in step 4 are determined the detector failed and carried out by the explorer response reconstruction value obtained after calculating
Failure diagnosis again, if now reconstruction value and the error of measured value are still very big, can finally judge the position sensor
Failure, if now reconstruction value and measurement error very little, although can determine whether that the detector measurement value of the position is flat beyond measurement
Average is more than M times or 1/M times, but the detector does not fail, but reflects the truth of reactor core.
Core power in steps of 5 of the invention, which is distributed online monitoring calculation and the calculating of explorer response reconstruction value, to be used
Any reliable, quick core power distribution on-line monitoring method, such as harmonic expansion method, simulated calibration method, coefficient of coup method,
Least square method, erro synthesis, internal boundary condition method, the method for the invention for detector failure diagnosis is not by reactor core work(
Rate is distributed the limitation of on-line monitoring method.The flow chart of general core power distribution on-line monitoring system is as shown in Figure 2.With harmonic wave
Exemplified by the method for development, the on-line monitoring system flow chart based on harmonic expansion method is as shown in Figure 3.
Step 8 is the iterative cycles for step 5 to step 7, and step 7 retrieves " third time failure diagnosis each time
Detector measurement value afterwards " is intended to re-start once on-line monitoring and calculates and re-start " third time " failure diagnosis, until
It is diagnosed there is no new failure detection device and just thinks that the diagnosis process terminates.
Judgement of the present invention by three phases to detector measurement value, is realized to detector measurement value with the presence or absence of abnormal
Rapidly diagnosis, and ensure in on-line monitoring system without using being diagnosed to be abnormal detector measurement value.
To verify effectiveness of the invention, using typical pressurized water reactor core structural exploration device failure example.Assuming that in reactor core
Axially failure as shown in Figure 4 occurs probe access for the 10th detector, then using general detector failure diagnosis mode
Detector failure can not be diagnosed, it is necessary to together consider the detector measurement value with other detector measurement values adjacent thereto
The detector, which can be just diagnosed to be, has obvious failure characteristics.As a result show, row detector failure diagnosis are entered using the present invention, at this
In reactor core example, M=20, N=30 are selected, the failure of the construction is diagnosed to be exactly.Also, weeding out failure detection device
The explorer response reconstruction value for carrying out obtaining after core power distribution reconstruct after information is as shown in Figure 5.It can be seen that the present invention has very
High computational accuracy and judgment accuracy.
The separating capacity failed for the checking present invention for reactor core detector with local power oscillations, design is as shown in Figure 6
Example, dotted line for assume reactor core occur partial power reduction when detector measurement value.Enter row detector failure using the present invention
Diagnose, then no detector is diagnosed as failure.As a result show, will not be by when entering row detector failure diagnosis using the present invention
The operating mode that the reading deviation normal value for the detector that local power oscillations cause occurs for reactor core is mistaken for detector failure.Illustrate this
The diagnostic result that invention is failed to detector is accurately and reliably.
The present invention is not distributed online monitoring calculation side in terms of detector failure diagnosis by type photodetector, core power
Method, failure type limitation, with reliable precision and very high efficiency, adapt to the calculating requirement of engineering in practice.
Claims (1)
1. a kind of method of diagnostic reaction pile neutron detector failure, it is characterised in that：Comprise the following steps：
Step 1：Read reactor core physical dimension, reactor core material arrangement, detector total number, probe access number, spy
Survey device title；
Step 2：Neutron detector measured value and detector position are read at the neutron detector of reactor in-core；According to step
Detector total number in rapid 1, judges whether detector measurement value number is equal to detector total number, if being equal to, and carries out next step；
If being not equal to, according to the detector position for not reading detector measurement value, failure detection device title is determined；
Step 3：Whether according to the detector measurement value read in step 2, it is 0 value or negative value to judge each measured value, if 0
Value or negative value, then remove the value；One group of detector measurement value for removing 0 value or negative value is obtained, is referred to as, after first time failure diagnosis
Detector measurement value；
Step 4：On the basis of the detector measurement value after first time failure diagnosis in step 3, judge that each detector is surveyed
Whether value exceeds M times or 1/M times of the average value of all measured values, wherein M>1, if exceeding, remove the value；Obtain one group
Remove the detector measurement value of M times or 1/M times of the average value beyond all measured values, be referred to as, the spy after second of failure diagnosis
Survey device measured value；M selection is different according to different reactor core types, different type photodetectors, by User Defined；
Step 5：According to reading reactor core dimensioning in the detector measurement value and step 1 after second of failure diagnosis in step 4
Very little, reactor core material arrangement parameter, carries out core power and is distributed online monitoring calculation and the calculating of explorer response reconstruction value；
Step 6：Online monitoring calculation result is distributed according to core power in step 5 and obtains one group of explorer response reconstruction value, is tied
The detector measurement value of gained in step 3 is closed, detector measurement value and explorer response weight are carried out to the detector of all positions
The relative error of structure value is calculated；Calculation formula is：
Step 7：The relative error of all detector positions, judges explorer response reconstruction value and detector according to obtained by step 6
Whether measured value relative error is more than N%, wherein N>10, if being more than, remove the detector measurement value；One group is obtained to eliminate
Explorer response reconstruction value is more than N% detector measurement value with detector measurement value relative error, is referred to as, and is lost by third time
Detector measurement value after effect diagnosis；N value is relevant with heap-type, type photodetector, by User Defined；
Step 8：According to the detector measurement value obtained in step 7, the calculating of step 5, step 6 and step 7 is carried out again, until
No longer occurs new failure detection device in the judgement of step 7；
Step 9：According to step 8, output detector failure diagnosis result, and core power are distributed online monitoring calculation result, visited
Survey device response result of calculation.
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| CN107316665B (en) * | 2017-06-01 | 2019-01-29 | 西安交通大学 | A kind of optimum design method of self-power neutron detector structure |
| KR102034830B1 (en) * | 2018-01-05 | 2019-10-21 | 한국수력원자력 주식회사 | Method of monitoring for regional overpower protection detector |
| CN109887625B (en) * | 2019-03-07 | 2022-04-22 | 中国核动力研究设计院 | Detector failure coping method and current recovery method for reactor core online monitoring |
| TWI773001B (en) * | 2019-12-06 | 2022-08-01 | 美商西屋電器公司 | Method and apparatus employing vanadium neutron detectors |
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