CN105280253A - Method and system for operating reactor core power - Google Patents
Method and system for operating reactor core power Download PDFInfo
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Abstract
The invention discloses a method and a system for operating reactor core power. The method comprises the following steps: receiving a pre-operation instruction inputted by an operator, wherein the pre-operation instruction includes a pre-operation amount aiming at the reactor core; establishing a three-dimensional reactor core diffusion calculation model based on the pre-operation amount, and calculating reactor core power distribution; and indicating the operator to perform an operation instruction corresponding to the pre-operation amount in the case that the calculated reactor core power distribution meets predetermined conditions. The scheme can overall ensure the accuracy of the operation of the reactor power.
Description
The application is the divisional application that the name submitted on November 19th, 2013 to China Intellectual Property Office is called the application for a patent for invention 201310585680.3 of " method and system of monitoring reactor core power ".
Technical field
The application relates to reactor surveillance field, particularly a kind of reactor core power monitor method and system.
Background technology
The eighties in last century, reactor core power monitoring technology has obtained international attention, up to now, each macronucleus electricity developer has developed a few cover reactor on-line monitoring system, as the BEACON of US Westinghouse company's exploitation, the MAGLAN of French Areva Ta company, the GARDEL of Studisvik company of the U.S., the POWERPLEX of Siemens Company, Muscovite SCORPIPO etc.
Several large reactor on-line monitoring system developed at present, method adopts the flux pattern mapping method of each company mostly.Such as, the mapping of Westinghouse Electric's flux pattern adopts Spline-Fitting method, and BEACON use is exactly Spline-Fitting method; What the flux pattern mapping of Areva Ta company adopted is detector correction method, and what MAGLAN adopted is also detector correction method.At present, two kinds of most widely used in presurized water reactor and boiling-water reactor reactor core power monitor methods are Spline-Fitting method and neutron detector correction method.Meanwhile, Canadian AECL company has developed harmonic expansion method in heavy water reactor, for the on-line monitoring of reactor.Meanwhile, the Tsing-Hua University of China has carried out the research of applying harmonic expansion method in high temperature gas cooled reactor, and Xi'an Communications University has carried out in presurized water reactor and applies the research that harmonic expansion method carries out reactor core power on-line monitoring aspect.
Sum up existing several reactor core power monitor method, Spline-Fitting method and detector correction method depend on the precision of reactor core analog computation, when analog computation precision is higher, utilize splines or detector correction, eliminate simulation error, to reach acceptable monitoring accuracy as far as possible.But, once relatively large deviation appears in analog computation, then cannot prove that the monitoring result of the method is believable.In harmonic expansion method, because harmonic wave has theoretic completeness, be applicable to launching core power distribution, thus the precision of monitoring can be ensured on the whole, but being limited to limited available information, it launches exponent number can not be infinitely great, therefore cannot ensure the monitoring accuracy of local.
Summary of the invention
The object of this invention is to provide a kind of method of monitoring reactor core power, reference can be provided for reactor core control operation, improve the security of reactor.
In one aspect of the invention, propose a kind of method of monitoring reactor core power, comprise step: the current state information gathering operating reactor; Set up the three-dimensional diffusion computation model of reactor core based on the reactor current state information gathered, and and then calculate the harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core of reactor; The reading of the harmonic wave calculated and the neutron detector be arranged in reactor core is utilized to carry out the power distribution of matching reactor core.
Preferably, the step utilizing the reading of the harmonic wave calculated and the neutron detector be arranged in reactor core to carry out the power distribution of matching reactor core comprises:
Launch the power distribution of reactor core by calculated harmonic linear, in conjunction with the fission reaction rate of neutron detector present position, utilize least square method to solve expansion coefficient, obtain the core power distribution of matching.
Preferably, described method also comprises step: for the region not arranging neutron detector, according to the roomage response function of the neutron detector reading around this region and neutron detector, calculate the corrected parameter of this area power calculated value, revise the monitor value obtaining this area power.
Preferably, described method also comprises step: be distributed as basis with the core power of matching, in conjunction with the reading of the heap in-core neutron detector gathered, corrects the core power of matching, obtains the monitor value of core power distribution.
Preferably, described method also comprises step: the status information of Regeneration response heap; Upgrade three-dimensional reactor core computation model based on the status information upgraded, and correspondingly calculate current core power distribution, upgrade harmonic wave.
Preferably, the first order harmonics of the three-dimensional neutron diffusion equation of stable state reactor core under current state is calculated according to updated three-dimensional core model.
Preferably, described method also comprises step: introduce a curvature variable to the leakage item of neutron diffusion equation; Using the In-core Instrumentation Flux Distribution that obtains during power plant's flux mapping as known conditions, calculate the value of described curvature variable, correct three-dimensional core model.
Preferably, described method also comprises step: compare the difference between the calculated value of neutron detector reading and measured value; If the difference calculated exceeds the scope of permission, then determine that this neutron detector lost efficacy.
Preferably, described method also comprises step: compare the difference between the calculated value of neutron detector reading and measured value; If the difference calculated exceeds the scope of permission, then sorted by the absolute value of neutron detector relative deviation, the neutron detector selecting relative deviation maximum is as accurate failure detection device;
Remove the information of accurate failure detection device, recalculate the difference between the calculated value of neutron detector reading and measured value;
If the difference recalculated still within operation deviation range, then confirms that accurate failure detection device lost efficacy.
Preferably, described method also comprises step: the calculated value of more multiple neutron detector and measured value; When the calculated value of multiple neutron detector and measured value deviate from preset range, then think that reactor is abnormal; When judging to occur abnormal, the probable value occurred according to abnormal conditions extracts data, as the ingredient of harmonic wave from abnormal conditions database; Again matching is carried out to the power distribution of reactor core.
In another aspect of this invention, propose a kind of system of monitoring reactor core power, comprising: the device gathering the current state information of operating reactor; Set up the three-dimensional diffusion computation model of reactor core based on the reactor current state information gathered, and and then calculate the device of harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core of reactor; The reading of the harmonic wave calculated and the neutron detector be arranged in reactor core is utilized to carry out the device of the power distribution of matching reactor core.
In another aspect of the invention, propose a kind of method of operating reactor, comprise step: the pre-operation instruction receiving operator's input, described pre-operation instruction comprises the pre-operation amount for reactor core; Set up the three-dimensional diffusion computation model of reactor core based on described pre-operation amount, and and then calculate reactor core power distribution; Operator is indicated to perform the operational order corresponding with described pre-operation amount when the distribution of calculated core power meets predetermined condition.
Preferably, described method also comprises step: the recommendation calculating pre-operation amount when the distribution of calculated core power does not meet predetermined condition; Instruction operator performs the operational order corresponding with recommending operational ton.
In still another aspect of the invention, propose a kind of system of operating reactor, comprising: the device receiving the pre-operation instruction of operator's input, described pre-operation instruction comprises the pre-operation amount for reactor core; Set up the three-dimensional diffusion computation model of reactor core based on described pre-operation amount, and and then calculate reactor core power distribution device; Operator is indicated to perform the device of the operational order corresponding with described pre-operation amount when the distribution of calculated core power meets predetermined condition.
In still another aspect of the invention, propose a kind of method for monitoring abnormality of reactor, comprise step: the current state information gathering operating reactor; Set up the three-dimensional diffusion computation model of reactor core based on the reactor current state information gathered, and and then calculate the harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core of reactor; The calculated value of multiple neutron detector is determined based on described harmonic wave; The calculated value of more multiple neutron detector and measured value; When the calculated value of multiple neutron detector and measured value deviate from preset range, then think that reactor is abnormal; When judging to occur abnormal, the probable value occurred according to abnormal conditions extracts data, as the ingredient of harmonic wave from abnormal conditions database; Again matching is carried out to the power distribution of reactor core, obtain the reactor core power distribution under abnormal conditions.
Preferably, by before each circulation charging, simulate all kinds of abnormal conditions, and the power distribution under providing abnormal conditions carrys out forming reactions heap abnormal conditions database.
Preferably, the step utilizing the reading of the harmonic wave calculated and the neutron detector be arranged in reactor core to carry out the power distribution of matching reactor core comprises: the power distribution launching reactor core by the harmonic linear calculated, in conjunction with the fission reaction rate of neutron detector present position, utilize least square method to solve expansion coefficient, obtain the core power distribution of matching.
In still another aspect of the invention, propose a kind of exception monitoring system of reactor, comprising: the device gathering the current state information of operating reactor; Set up the three-dimensional diffusion computation model of reactor core based on the reactor current state information gathered, and and then calculate the device of harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core of reactor; The device of the calculated value of multiple neutron detector is determined based on described harmonic wave; The calculated value of more multiple neutron detector and the device of measured value; When the calculated value of multiple neutron detector and measured value deviate from preset range, then think the device of reactor exception; When judging to occur abnormal, the probable value occurred according to abnormal conditions extracts data, as the device of the ingredient of harmonic wave from abnormal conditions database;
Again matching is carried out to the power distribution of reactor core, obtain the device of the reactor core power distribution under abnormal conditions.
According to such scheme, adopt harmonic expansion method to carry out matching to core power distribution, then adopt the power distribution of neutron detector correction method to matching to correct, not only ensure that overall power monitoring precision, and ensure that the power monitoring precision of local.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below:
Fig. 1 is the structured flowchart of the system according to the embodiment of the present invention;
Fig. 2 A shows the general flow chart of method according to an embodiment of the invention;
Fig. 2 B shows the process flow diagram of method according to another embodiment of the present invention.
The process flow diagram that Fig. 3 is the single time step monitoring shown in Fig. 2 B and prealarming process;
Fig. 4 is that core model upgrades and the process flow diagram of trimming process again;
Fig. 5 is the process flow diagram of harmonic wave renewal process;
Fig. 6 is the process flow diagram of detector failure detection process;
Fig. 7 is the process flow diagram of abnormal conditions observation process;
Fig. 8 is the process flow diagram of prealarming process.
Embodiment
To specific embodiments of the invention be described in detail below, it should be noted that the embodiments described herein is only for illustrating, is not limited to the present invention.In the following description, in order to provide thorough understanding of the present invention, a large amount of specific detail has been set forth.But, those of ordinary skill in the art be it is evident that: these specific detail need not be adopted to carry out the present invention.In other instances, in order to avoid obscuring the present invention, do not specifically describe known structure, circuit, material or method.
In whole instructions, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: the special characteristic, structure or the characteristic that describe in conjunction with this embodiment or example are at least one embodiment of the invention involved.Therefore, the phrase " in one embodiment " occurred in each place of whole instructions, " in an embodiment ", " example " or " example " differ to establish a capital and refer to same embodiment or example.In addition, can with any suitable combination and/or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that term "and/or" used herein comprises any and all combinations of one or more relevant project listed.
In the embodiment of the application, provide a set of eurytopic reactor core power distribution monitoring system embodiment.Technical scheme in the embodiment of the present application is understood better in order to make those skilled in the art person, and enable the above-mentioned purpose of the embodiment of the present application, feature and advantage become apparent more, below in conjunction with accompanying drawing, technical scheme in the embodiment of the present application is described in further detail.
For the problem of monitoring method various in prior art, some embodiments of the present invention set up a set of eurytopic reactor core power distribution monitoring method, and design a set of reactor on-line monitoring system based on the method.The three-dimensional diffusion computation model of reactor core is set up based on the reactor current state information gathered, and and then the harmonic wave of the three-dimensional neutron diffusion equation of the stable state reactor core of calculating reactor.Then the harmonic wave of calculating and the reading of the neutron detector be arranged in reactor core is utilized to carry out the power distribution of matching reactor core.Such scheme can ensure overall power monitoring precision, can ensure again the power monitoring precision of local.
Fig. 1 is the structured flowchart of the system according to the embodiment of the present invention.System as shown in Figure 1 comprises reactor 101, the opertaing device 103 of neutron detector 102, such as computing machine and so on of detection reaction heap and the actuator 104 of the computation process execution control procedure according to opertaing device 104.
Fig. 2 A shows the general flow chart of method according to an embodiment of the invention.As shown in Figure 2 A, in step 201, gather the status information of reactor core.Such as, the current status information of reactor is gathered by power plant's computer network, this status information mainly comprises: the control rod position that the current boron concentration of the current relative power of reactor, reactor, reactor are current, and by calculating the current burnup profile information of reactor.In addition, also can be gathered the current value of reactor core internally-fixed neutron detector by power plant's computer network, and convert the fission reaction rate of detector present position to.Said reactor core internally-fixed neutron detector can be arranged symmetrically with in heap herein, also can be asymmetric arrangement.
In step S202, set up the three-dimensional diffusion computation model of reactor core based on the reactor current state information gathered, and and then the harmonic wave of the three-dimensional neutron diffusion equation of the stable state reactor core of calculating reactor.
In certain embodiments, set up reactor core computation model as follows: the reactor current state information gathered according to power plant's computer network, build the three-dimensional diffusion computation model of reactor core, comprising: the geometry of reactor core divides, the calculating of cross section parameter.Then, reactor core three-dimensional diffusion model is utilized to calculate harmonic wave.The three-dimensional neutron diffusion equation of stable state reactor core is an eigenvalue problem, and it has a series of solution and is called harmonic wave, and the computing method of harmonic wave have multiple, comprises ARNOLDI decomposition method, GREMS method, source modification method etc.Adopt either method can calculate the harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core.
In step S203, the reading of the harmonic wave calculated and the neutron detector be arranged in reactor core is utilized to carry out the power distribution of matching reactor core.Such as, the completeness of the harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core is utilized to carry out the distribution of linear expansion core power, in conjunction with the fission reaction rate of the detector present position collected, solve expansion coefficient by least square method, thus obtain the core power distribution of matching.
In step S204, utilize the core power distribution of the reading of the neutron detector be arranged in reactor core to matching to do further to correct, obtain the monitor value of core power distribution.Such as, use the power distribution of the valid reading of the neutron detector be arranged in reactor core to matching to correct, obtain the monitor value after correcting.In certain embodiments, core power distribution correction method is the calculating reading of hypothesis reactor core internally-fixed neutron detector and the ratio of survey measurements is constant, for the region not arranging neutron detector, according to the roomage response function of the neutron detector reading around it and neutron detector, provide the corrected parameter of this area power calculated value, thus revise the monitor value obtaining this area power.
Fig. 2 B shows the process flow diagram of method according to another embodiment of the present invention.As shown in Figure 2 B, in this embodiment, per predetermined time section just carry out the monitoring of some reactor core power, and carry out early warning in observation process, namely current reactor whether safety.In addition, also the model of reactor core upgraded in the implementation of the method and correct, making the model that uses in upper once observation process more accurate.
Shown in Fig. 2 B, the implementation process of the reactor core power distribution monitoring system of the embodiment of the present invention will be described in detail below.
Step 211: the preparation before system starts calculates.Mainly possible to reactor unusual service condition carries out analog computation, generates abnormal conditions database, and sorts according to the size of abnormal conditions probability of happening.
Step 212: time step motion control, this control procedure determines the frequency of system monitoring reactor core power distribution, such as monitoring in an every 30 minutes power, but at once can start monitoring facilities when a stable condition occurs.
Step 213: reactor internal information gathers, be mainly used in the information gathering reactor inside, comprise the current value gathering reactor core internally-fixed neutron detector, the information such as numerical value, control rod position of piling in-core boron concentration, in each time step, all once gather.
Such as, the information that acquisition system needs from power plant's computer network, comprises the reading of heap internally-fixed neutron detector, the heap status information of in-core and the operational order etc. of operator.Reactor core status information comprises the reactor core concentration of soluble boron, control rod present position etc. in information acquisition moment.
Step 214: after collecting reactor internal information, system will be carried out once to Real-Time Monitoring and/or the early warning of core power distribution.
In certain embodiments, the distribution of the core power that obtained by matching, close to the real power distribution of reactor core, but is distributed with real core power and still has deviation.For improving monitoring accuracy further, basis is distributed as with the core power of matching, in conjunction with the reading of the reactor core internally-fixed neutron detector gathered, the core power distribution of matching is corrected, thus obtain the monitor value of core power distribution, and output display is to operator, as the reference of operator's operating reactor.
In certain embodiments, core power distribution correction method is the calculating reading of hypothesis reactor core internally-fixed neutron detector and the ratio of survey measurements is constant, for the region not arranging neutron detector, according to the roomage response function of the neutron detector reading around it and neutron detector, provide the corrected parameter of this area power calculated value, thus revise the monitor value obtaining this area power.
Step 215: the monitoring in step 104 and early warning result are outputted to human-computer interaction interface, for operator's reference.
Step 216: metrical information, monitoring and early warning result in reactor and reactor operation information are generated the document of consolidation form and preserve, in order to calling in the future.
Step 217: core model upgrades and corrects, has been responsible for the renewal of reactor core computation model and has corrected.
In certain embodiments, the renewal of three-dimensional core model mainly divides two parts, and one is upgrade the reactor state parameter collected by power plant's computer network; It two is upgrade the burnup profile of reactor core, and update method is the monitor value utilizing core power distribute, the working time of association reaction heap, recalculates the burnup profile piling in-core.
Because the renewal of harmonic wave is more consuming time, in order to meet the requirement of real-time of on-line monitoring, the renewal of harmonic wave being divided into two kinds of situations, being respectively the renewal of low order harmonics and the renewal of high-order harmonic wave.The renewal of low order harmonics refers to and only upgrades the first order harmonics (being also called first-harmonic).When system reaches certain trigger condition, calculate current core power by three-dimensional core power calculation procedure according to updated three-dimensional core model and distribute, and it can be used as first-harmonic, thus complete the renewal of low order harmonics.The renewal of high-order harmonic wave refers to and upgrades all harmonic waves.When system reaches certain trigger condition, system, by according to updated three-dimensional core model, calls the harmonic wave of the three-dimensional neutron diffusion equation of stable state reactor core of Harmonics Calculation program computation current state.
Because the working time of a phase in longevity of reactor is very long, therefore error may be introduced in the renewal process of three-dimensional core model, thus cause the three-dimensional core model after upgrading and real reactor core state to produce deviation, be incorporated herein the bearing calibration again of three-dimensional core model, to eliminate the error that model modification process is introduced.
Existing reactor every other month left and right all can once pile interior flux pattern mapping, can obtain measure core power distribution, and think this measurement core power distribution be believable.The method that three-dimensional core model corrects again can be expressed as: introduce a curvature variable at the leakage item of neutron diffusion equation.Distributed as known conditions by the core power measured, calculate this curvature variable, thus complete correcting again of three-dimensional core model.
Due under being exposed to high radiation environment for a long time, inevitably there is the situation that detector lost efficacy in heap internally-fixed neutron detector.When detector lost efficacy, the reading of detector can produce exception, if monitor core power distribution with the detector readings of exception, will inevitably cause and the departing from of actual state.Therefore the detection carrying out detector inefficacy is needed.
Detect detector whether to lose efficacy, first need to check whether and occur abnormal signal.Check that the method for abnormal signal is expressed as follows: (1) compares the difference between the calculated value of neutron detector reading and measured value, if this difference exceeds permissible variation value range, then system " suspection " there occurs detector inefficacy.(2) lost efficacy if system " suspection " there occurs detector, then operated below entering: the absolute value of detector readings relative deviation is sorted, chooses the detector that relative deviation is maximum, this detector is called accurate failure detection device.(3) remove the information of accurate failure detection device, recalculate the difference between the calculated value of neutron detector reading and measured value, if difference is within permissible variation scope, then confirm that accurate failure detection device lost efficacy; If difference is still greater than permissible variation scope, then continue to find accurate failure detection device, but this searching process is no more than a certain maximal value.
Reactor is in operational process, and the abnormal conditions outside may envisioning, at this moment the actual state of the core model set up of system and reactor has larger difference, thus causes monitoring result to distribute with actual core power there is bigger difference.Therefore the present invention needs to monitor the carrying out of abnormal conditions.Mainly divide two parts to the monitoring of abnormal conditions: one is the judgement of abnormal conditions, it two is the monitoring of abnormal conditions.
First be the judgement to abnormal conditions.When abnormal conditions occur, often occur that the calculated value of multiple detector and measured value occur to depart from more greatly.In order to address this problem, can think and the situation that multiple detector lost efficacy simultaneously can not occur.If find that there is multiple detector at synchronization to lose efficacy simultaneously, then system thinks that reactor there occurs abnormal conditions.
Next is the monitoring to abnormal conditions.If system thinks that reactor there occurs abnormal conditions, then propose to report to the police to operator and enter abnormal conditions monitoring mechanism.Before each circulation charging of reactor, first system simulates all kinds of abnormal conditions, and the core power distribution under providing abnormal conditions, form reactor abnormal conditions database; When system thinks that reactor there occurs abnormal conditions, extract the data in abnormal conditions database according to the size of abnormal conditions probability of happening, as the ingredient of harmonic wave, then carry out matching and the correction of reactor core power distribution.
Operator is before carrying out certain operations to reactor, pre-operation instruction is input in reactor core power monitoring system, system can according to the pre-operation instruction of operator, calls the operation of internal calculation process simulation operator and provides core power and be distributed in not result in the same time.The internal calculation program at this place comprises that reactor core is designed program, reactor kinetics program etc.
See Fig. 3, be the single time step monitoring of the application and/or the process flow diagram of early warning, this process has been responsible for monitoring and/or early warning task.
Step 301: collect status information in above-mentioned heap, is mainly used in building of reactor core computation model.
Step 302: the information of status information and/or renewal and the core model after correcting again in comprehensive heap, sets up the reactor core computation model of current time.
Step 303: harmonic wave upgrades, is responsible for the computation model according to reactor core, upgrades the harmonic wave in core power fitting of distribution process.
Step 304: core power fitting of distribution, is mainly used in the power distribution of matching reactor core.Its main contents have: the distribution of the power of reactor core is launched into the form that step 303 provides harmonic linear combination, in conjunction with the reading of the heap internally-fixed neutron detector that heap internal information collecting unit collects, solve by least square method and obtain expansion coefficient, thus try to achieve the core power distribution of matching.
Step 305: core power distribution correction, is mainly used in the matching core power distribution obtained in aligning step 304, thus obtains the monitor value of core power distribution.
Step 306: detector failure detection, is mainly used in having checked whether that detector lost efficacy, if there is detector to lose efficacy, then failure detection device is put into certificate revocation list, and do not re-use the information of failure detection device in follow-up observation process.
Step 307: abnormal conditions are monitored, and when occurring for abnormal conditions, still monitor reactor, and report to the police to operator.The detailed description of this unit is described in the figure 7.
Step 308: check whether early warning signal is opened, system can provide the mark that early warning signal is opened or closed, and system determines whether to call prealarming process according to this signal.
Step 309: early warning, for carrying out early warning calculating to the pre-operation of operator.
See Fig. 4, for core model upgrades and correcting process figure again, this process is mainly used in the computation model upgrading reactor core, to guarantee that Harmonics Calculation model is consistent with reactor core real conditions, thus improves the accuracy of monitoring.
Step 401: first system judges whether to need to upgrade reactor core computation model, if need to upgrade reactor core computation model, then enters step 402, if do not need to upgrade reactor core computation model, then exits core model and upgrades and trimming process again.
Step 402: check that reactor core computation model is the need of correcting again.Only reach correcting condition again, system just can carry out correcting again of reactor core computation model.If reach correcting condition again, enter step 404, otherwise, then enter step 403.
Step 403: this step carries out the renewal of reactor core computation model.Main update content has: the renewal of reactor core burnup profile, the renewal of reactor core state.
Step 404: this step is core model trimming process again, when reaching correcting condition, system can carry out correct operation again to the computation model of reactor core again.
Participate in Fig. 5, be harmonic wave renewal process process flow diagram, this process Main Function be according to upgrade after reactor core computation model, calculate new harmonic wave, for step 304.
Step 501: reactor core computation model described in this step, namely for be upgraded by core model and again correcting unit upgrade after reactor core computation model.
Step 502: check whether the trigger condition reaching and upgrade high-order harmonic wave, if reach condition, then enter step 503, otherwise, then enter step 504.
Step 503: upgrade high-order harmonic wave, the method for renewal is: according to the computation model of step 501, calculates the harmonic wave of high-order with harmonic calculation method.Namely harmonic wave renewal process is exited after having upgraded high-order harmonic wave.
Step 504: check whether the trigger condition reaching and upgrade low order harmonics, if reach the trigger condition upgrading low order harmonics, enters step 505, otherwise, then exit harmonic wave renewal process.
Step 505: upgrade low order harmonics, low order harmonics described herein is the first order harmonics.
See Fig. 6, for detector failure detection process, this process is after each power monitoring, all carry out the detection whether detector lost efficacy, once detect that detector lost efficacy, list in certificate revocation list by this failure detection device, and do not re-use the signal of this detector in subsequent power observation process.Being described in detail as follows of this unit:
Step 601: initialization failure detection device count parameter NDL, makes NDL=0.
Step 602: compare the difference between neutron detector calculating reading and survey measurements, wherein, it is that the core power distribution monitoring value obtained according to step 305 calculates that neutron detector calculates reading.
Step 603: whether the difference value that determining step 602 calculates exceeds permissible variation scope.If exceed permissible variation scope, then forward step 604 to; Otherwise, exit detector failure detection unit.
Step 604: carry out detector inefficacy and judge.
Step 605: judge whether it is that single detector lost efficacy, if single detector lost efficacy, then enter step 606; If be that non-single detector lost efficacy, then enter step 607.
Step 606: failure detection device is imported certificate revocation list, and shields the signal of this failure detection device.
Step 607: NDL=NDL+1 is set.
Step 608: judge whether the value of NDL is greater than a certain setting value, if be greater than, then enters step 609; If be less than or equal to, then returned step 602 and carry out cycling.
Step 609: open abnormal conditions signals, when systems axiol-ogy is to when having more than 3 neutron detectors to lose efficacy simultaneously, system is thought and now be there occurs abnormal conditions.In other embodiments, also can be set to more neutron detector lost efficacy simultaneously and just think that system there occurs exception.
See Fig. 7, be abnormal conditions observation process, this process is responsible for, when systems axiol-ogy occurs to abnormal conditions, monitoring and report to the police to abnormal conditions.
Step 701: judge whether abnormal conditions signal is opened, if opened, enters step 702; If there is no abnormal conditions signal, then exit abnormal conditions monitoring means.
Step 702: from the abnormal conditions database that step 101 is set up, according to the size of abnormal conditions possibility occurrence, extract data successively, as additional harmonic.
Step 703: utilize and humorously involve additional harmonic, carry out matching and the correction of core power distribution, obtain the core power distribution monitoring value that each additional harmonic is corresponding.
Step 704: what utilize step 703 to obtain adds different monitor values corresponding to harmonic wave, calculate different neutron detectors and calculate reading, respectively calculate the difference between reading and survey measurements, choose former groups that difference is minimum, system thinks that the abnormal conditions of its correspondence are current contingent abnormal conditions.Finally, several groups of abnormal conditions chosen are exported to display system, for operator's reference by system.
See Fig. 8, it is prealarming process process flow diagram.Prealarming process is responsible for carrying out early warning calculating to the pre-operation of operator and exporting early warning result.It is described in detail as follows:
Step 801: system call reactor core Neutronics calculation program, to the computational analysis that the pre-operation instruction of operator is carried out in advance, and exports to display system by result of calculation, for operator's reference.Reactor core Neutronics calculation program described above comprises that reactor core is designed program, reactor kinetics program etc.
Step 802: close early warning signal.
According to embodiments of the invention, due to the situation of harmonic wave reflection reactor entirety, and have completeness in theory, be the function being most appropriate to launch core power distribution, therefore harmonic expansion method is often beneficial to the overall permanence describing reactor core.Detector correction method utilizes the information being corrected the adjacent several neutron detectors in region, this area power density calculation value is corrected, embody the local characteristics in this region, but detector correction method depends on the precision of analog computation, if large deviation appears in analog computation and actual state, then can cause the bigger than normal of correction error.Harmonic expansion method and detector correction method all have limitation, and embodiments of the invention combine the advantage of two kinds of methods, are formed and have complementary advantages.Compared to simple harmonic expansion method, invention increases the step that detector correction calculates, thus eliminate the deficiency of harmonic expansion method to local power distortion adaptability to changes; Compared to simple detector correction method, the result of the present invention's harmonious wave fitting as correction basis, thus ensure that on the whole with the agreeing with of reactor core actual condition.
In addition, be provided with detector failure detection process in certain embodiments, thus the problem of the heap internally-fixed neutron detector inefficacy more often occurred can be tackled.Some embodiments of the invention are also provided with unusual service condition observation process, thus add the adaptibility to response to reactor unusual service condition.Other embodiments of the present invention set up reactor prealarming process equally, thus make reactor capability monitoring system have pre-alerting ability, meet operator carries out early warning requirement to pre-operation instruction.The present invention is provided with file management process, makes observation process achieve reproducibility.Time aspect, is provided with time step control procedure, in normal observation process, only carry out matching and the correction of core power distribution, under current design conditions, these two operations expend time in hardly, thus ensure that the time requirement that reactor capability is monitored.Meanwhile, some embodiments of the present invention are provided with core model and upgrade and trimming process again, follow the tracks of reactor core state at any time, thus ensure the precision to reactor capability monitoring.
The monitoring method of the embodiment of the present invention does not limit heap-type, is applicable to any reactor being provided with heap internally-fixed neutron detector.
Above detailed description, by using schematic diagram and/or example, has set forth numerous embodiments of the method and system of monitoring reactor core power.When this schematic diagram and/or example comprise one or more function and/or operation, it will be understood by those skilled in the art that each function in this example and/or operation can by various hardware, software, firmware or in fact their combination in any come to realize separately and/or jointly.In one embodiment, some parts of theme described in embodiments of the invention can be realized by special IC (ASIC), field programmable gate array (FPGA), digital signal processor (DSP) or other integrated forms.But, those skilled in the art will recognize that, some aspects of embodiment disclosed herein can realize in integrated circuits on the whole or partly equally, be embodied as one or more computer programs of running on one or more computing machine (such as, be embodied as the one or more programs run in one or more computer system), be embodied as one or more programs of running on the one or more processors (such as, be embodied as the one or more programs run on one or more microprocessor), be embodied as firmware, or be embodied as in fact the combination in any of aforesaid way, and those skilled in the art are according to the disclosure, the ability of design circuit and/or write software and/or firmware code will be possessed.In addition, those skilled in the art will recognize that, the mechanism of theme described in the disclosure can be distributed as the program product of various ways, and regardless of the actual particular type of signal bearing medium being used for performing distribution, the exemplary embodiment of theme described in the disclosure is all applicable.The example of signal bearing medium includes but not limited to: recordable-type media, as floppy disk, hard disk drive, compact-disc (CD), digital universal disc (DVD), numerical tape, computer memory etc.; And transmission type media, as numeral and/or analogue communication medium (such as, optical fiber cable, waveguide, wired communications links, wireless communication link etc.).
Although exemplary embodiment describe the present invention with reference to several, should be appreciated that term used illustrates and exemplary and nonrestrictive term.Spirit or the essence of invention is not departed from because the present invention can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in claim of enclosing, therefore fall into whole change in claim or its equivalent scope and remodeling and all should be claim of enclosing and contained.
Claims (10)
1. a method for operating reactor, comprises step:
Receive the pre-operation instruction of operator's input, described pre-operation instruction comprises the pre-operation amount for reactor core;
Set up the three-dimensional diffusion computation model of reactor core based on described pre-operation amount, and and then calculate reactor core power distribution;
Operator is indicated to perform the operational order corresponding with described pre-operation amount when the distribution of calculated core power meets predetermined condition.
2. the method for claim 1, also comprises step:
The recommendation of pre-operation amount is calculated when the distribution of calculated core power does not meet predetermined condition;
Instruction operator performs the operational order corresponding with recommending operational ton.
3. the method for claim 1, the step wherein calculating the core power distribution of reactor comprises:
The reading of the harmonic wave calculated and the neutron detector be arranged in reactor core is utilized to carry out the power distribution of matching reactor core.
4. method as claimed in claim 3, the step utilizing the reading of the harmonic wave calculated and the neutron detector be arranged in reactor core to carry out the power distribution of matching reactor core comprises:
Launch the power distribution of reactor core by calculated harmonic linear, in conjunction with the fission reaction rate of neutron detector present position, utilize least square method to solve expansion coefficient, obtain the core power distribution of matching.
5. the method for claim 1, also comprise step: for the region not arranging neutron detector, according to the roomage response function of the neutron detector reading around this region and neutron detector, calculate the corrected parameter of this area power calculated value, revise the monitor value obtaining this area power.
6. the method for claim 1, also comprises step: be distributed as basis with the core power of matching, in conjunction with the reading of the heap in-core neutron detector gathered, corrects the core power of matching, obtains the monitor value of core power distribution.
7. a system for operating reactor, comprising:
Receive the device of the pre-operation instruction of operator's input, described pre-operation instruction comprises the pre-operation amount for reactor core;
Set up the three-dimensional diffusion computation model of reactor core based on described pre-operation amount, and and then calculate the device of the three-dimensional power distribution of reactor core of reactor;
Operator is indicated to perform the device of the operational order corresponding with described pre-operation amount when the distribution of calculated core power meets predetermined condition.
8. system as claimed in claim 7, also comprises:
The device of the recommendation of pre-operation amount is calculated when the distribution of calculated core power does not meet predetermined condition;
Instruction operator performs the device of the operational order corresponding with recommending operational ton.
9. system as claimed in claim 7, the device wherein calculating the core power distribution of reactor comprises:
The reading of the harmonic wave calculated and the neutron detector be arranged in reactor core is utilized to carry out the device of the power distribution of matching reactor core.
10. system as claimed in claim 9, the device utilizing the reading of the harmonic wave calculated and the neutron detector be arranged in reactor core to carry out the power distribution of matching reactor core comprises:
Launch the power distribution of reactor core by calculated harmonic linear, in conjunction with the fission reaction rate of neutron detector present position, utilize least square method to solve expansion coefficient, obtain the device of the core power distribution of matching.
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| CN103617817B (en) | 2015-08-19 |
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