ML17254A890

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Startup Physics Testing Program.
ML17254A890
Person / Time
Site: Ginna Constellation icon.png
Issue date: 06/26/1984
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17254A889 List:
References
NUDOCS 8408070526
Download: ML17254A890 (8)


Text

1aJune26,1984StartupPhysicsTestingProgramCycle14StartupPhysicsTestingProgramwasconductedduringtheperiodfromMay11,1984toJune88,1984.Thestateddatesspanfrominitialcriticalitytoattainmentof188%power.Theresultsofthephysicstestingprogramshowedthatallmeasureddatawaswithintheboundsoftheacceptancecriteriatoleranceswithexceptionsasnotedbelow.ThePT-34seriesofprocedureswasusedtoperformthelowpowerphysicstestingmeasurementsinconjunctionwiththeS-15seriesforfluxmapping.Theprogramconsistedofdeterminingthefollowingparameters:l.Allrodsoutcriticalboronconcentration2.IsothermalTemperaturecoefficient3.ControlRodWorthsforBanks"D","C"and"B"4.Boronendpoints5.Coresymmetryandpowerdistributionmeasurements6.Criticalboronconcentration-FullPowerInitialcriticalitywasachievedon85/12/84at8458hours.TheHotZeroPowerparametersaslistedin1thru4abovewerethenmeasured.Thefluxsymmetrymappingandsubsequentpowerescalationandmeasurementofpowerdistributionandhotchannelfactorswasdelayeduntil5/23/84duetotheplantreturntocoldshutdownforsecondarychemistryconcerns.Thefollowingdatasummarizestheresultsofthetestingprogram.CriticalMeasurementsa~NuclearH~etDetermination:Nuclearheatwasobservedat~4x18ampsonChannelN-41.ItwasdeterminedfromthisthatalLreactivitymeasurementswouldbeperformedbelow2x18FullScaleampstostaybelownuclearheat.b.Reactiv~itComputerCheckout:Thereactorwasplacedonvaryingperiodstoprovideacomparisonofindicatedreactivitywiththatderivedfromperiodmeasurements.Thefollowingtablesummarizesthecomputercheckout:ControlBankTMeasured1Reactivity(PCM)TtDifferenceDStepsIReactorIl(M-P)x188WithdrawnIPeriod/SecondslMeasured(M)IPredicted(P)lP61826268'3157.298'523.1635.S652.5223~4536.153.1-1.25%.665-1.11%8408070526840709.PDRADOCK05000244PPDR

)(ttIt~St'ItItr,IItIlJII4IJt qc~'IsothermalTempatureCoefficient:Heatpandcooldownratesofapproximately18P7hr.wereestablishedtodeterminetheisothermaltemperaturecoefficient.Thefollowingdatasummarizestheresultsoftheaverageoftwoacceptabletraces.TAccetanceIMTCIsARO-4.9INotPositiveI-2.215+2.685IICore~MTCpDifferenceConfigurationIPredicted(P)ICriteriaIMeasured(M)I(M-P)1lrNOTE:ModeratorTemperatureCoefficient=ITC-(-1.66)d.ControlRodWorth:ControlRodworthwasmeasuredbyadjustingrodpositiontocompensatefordilution.Thefollowingtablesummarizestheintegralrodworthdata.PredictMeasuredDifferenceCtrlI(P)BankI(PCM)PPMIM-P(PCM)ICriter.PPPM(M)IAccept.I(M-P)x188IPredictIMeasureIDiffDC*BSum946184218822998914.5995.5827.52737.5+15%+15%+15%+18%3~334.46-17.428.4418211418331912318398324+21-ll5+5AcceptanceCriteria:Theacceptancecriteriaisthatthemeasuredindividualbankintegralworthbewithin15%ofthepredictedvaluesandthatthetotalworthofthreebanksbewithin185ofthepredictedvalue.Ifthecriteriononindividualbankworthisnotmet,anevaluationwillbeperformedtodeterminethecauseandanypotentialimpacts.Ifthecriterionintotalworthofthethreebanksisnotmet,additionalbankswillbemeasureduntilthemeasurementiswithin18%oftheprediction.Thiswillbecontinued,ifnecessary,tomeasurementatanN-1rodinsertedcondition.TheresultofanN-lmeasurement,withappropriateallowanceformeasurementuncertainty,willbecomparedtothevalueassumedintheSafetyAnalyses.Assummarizedabove,Bank"B"indicatedadeviationofpredictedrodworththatexceededtheacceptancecriteriaof+15%.Thetotalrodworthforthethreebankshowever,didsatisfytheacceptancecriteriaof+18' 0J~~fD

~,J'Thedeviationhabeenevaluatedbynuclear'engineering,and,ithasbeendeterminedthatproceedingtofullpowerisacceptableforthefollowingreasons.Thetotalrodworthforthethreebanksmeasurediswithin+18%ofpredictedvalues,therefore,satisfyingtheassumptionsoutlinedintheshutdownmargincalcu-lation.2~Theshutdownmargincalculation(Table6.3oftheNuclearDesignReport)indicatesthatexcessshutdownmarginof818pcmexiststotherequiredshutdownmarginof1888pcmatBOL.3~ThemeasuredARO,D,D+Cand,estimatedD+C+BboronendpointdatacomparewelltothepredictedvaluesindicatingthattheBbankdeviationdoesnotrepresentanunanticipatedcorereactivityanomaly.TheWestinghousenucleardesignerisconductinghisownevaluationtodeterminethecauseofthedeviation.Basedonthisevaluation,additionalfluxmapdataandcomparisonofoverallcoreperformanceversuspredictedthroughthecycle,itcanbedeterminedatalaterdatewhethertoimposeahigherDbankinsertionlimittowardendofcyclewheretheshutdownmarginisattheminimum.e.BoronEnd~oint:Thefollowingtablesummarizestheboronendpointdata.rrTDifferenceCon~icauration(predicated(p)(acceptance(Measured(M)((M-p)ARODInsertedD+CInserted*D+C+BInsertedl1329122711131818+75+75+75.+7513291286118318858-21-185AcceptanceCriteria:Theaveragecriticalboronconcentrationforagivenconfigurationwillbecomparedtothepredictedconcentrationforthatconfiguration.Theacceptancecriterionwillbe+75ppm.Ifthisacceptancecriterionisnotmet,themeasurementdatawillbereviewedandthefuelsupplierwillbeaskedtoreviewhispredictions.Concurrentwiththisreviewtheremainderofthezeropowerphysicstestingwillbecompletedtoseeifanyotherdifferencesarepresentthatcouldaidindeterminingthecauseofnotmeetingtheacceptancecriteria.Ifaftertheaboveactions,theacceptancecriterionstillcannotbemetanevaluationwillbeperformedontheeffectofthisdifferenceonparametersusedintheaccidentanalysis'ftheaccidentanalysisisunaffectedbythisdifference,thecorewillbeallowedtogoabove5%ratedpower.

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~~~.~NOTE:AlthoughthetestingprogramdidnotspecifymeasurementofControlBank"B"PPMBoronNorthortheBoronEndpointforD+C+BInserted,sufficientacquiredboronsampledataexistedtoincludethestatedvaluewithreasonableconfidence.FluxSymmetryandPowerDistribution:Thefluxsymmetryfluxmapwasperformedat23.6%ratedpower.Alllocationswereevaluatedtotheacceptancecriteriaaslistedbelow.Theonlylocationstofalloutoftheacceptancebounds,werelocationsI-5andI-6,whichrecorded-14.231%and-14.233%respectively.ThethimbleusedtopredicttheselocationsisI-5.ThisspecificassemblylocationisaMixedOxideAssembly(Plutoniumenriched).Theresultswereevaluatedanditwasdeterminedthatmodelingofthepowerdistributionforthisassemblywasthereasonforthedifference.Theremainderofthemapwasingoodagreementwithpredictionsandverifiedthecorewasproperlyloaded.AllNuclearHotChannelfactorswerewellwithintheboundsofPlantTechnicalSpecifications.Duringsubsequentpowerescalation,fluxmapsweregeneratedat46$,71.5%withIncore/Excorecalibrationperformedat83%power.Followingareactor/turbinetripduetoanexciterfailure,powerescalationto188%wasachieved.The188%mapwasthentakenon6/8/84,withallHotChannelFactorswellwithintheboundsofPlantTechnicalSpecifi-cations.A~ccetanceCriteria:TheacceptancecriterionforafluxmapisthattheplantTechnicalSpecificationonpeakingfactorsbemet.Asanaidinevaluatingthepowerdistributionmaps,thedifferencesbetweenmeasuredandpredictedassemblypowerlevelsarereviewed.Generalcriteriaforthesecomparisonsarethatthedifferenceforassemblieswithrelativepower<1'belessthan15%andthedifferenceforassemblieswithrelativepower>1.8belessthan18%.Ifthesedifferencesareexceeded,anevaluationshallbeperformedtoensurethatthepeakingfactorTechnicalSpecificationswillbemet.Ifsuchanevaluationindicatesthatthepeakingfactorlimitswillbemet,nofurtheractionisnecessary.geCriticalBoronConcentration-FullPower:Duetothenumerousdelaysasaresultofsecondaryconcernsencounteredduringstartup,HotFullPowerSteadystateconditionswerenotattaineduntil6/8/84,whichrepresentsanexposureof"388MWD/MTU.Thecalculatedboronconcentrationatthatpointwas888PPMwithapredicatedvalueof828PPM.SubsequentBoronmeasurementstodateindicatethepredicatedtocloselyapproximatetheactualvaluesobtained.

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