ML17254A890

Startup Physics Testing Program.

ML17254A890
Person / Time
Site:	Ginna
Issue date:	06/26/1984
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
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ML17254A889	List: ML17254A888 ML17254A890
References
NUDOCS 8408070526
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1aJune26,1984StartupPhysicsTestingProgramCycle14StartupPhysicsTestingProgramwasconducted duringtheperiodfromMay11,1984toJune88,1984.Thestateddatesspanfrominitialcriticality toattainment of188%power.Theresultsofthephysicstestingprogramshowedthatallmeasureddatawaswithintheboundsoftheacceptance criteriatolerances withexceptions asnotedbelow.ThePT-34seriesofprocedures wasusedtoperformthelowpowerphysicstestingmeasurements inconjunction withtheS-15seriesforfluxmapping.

Theprogramconsisted ofdetermining thefollowing parameters:

l.Allrodsoutcriticalboronconcentration 2.Isothermal Temperature coefficient 3.ControlRodWorthsforBanks"D","C"and"B"4.Boronendpoints 5.Coresymmetryandpowerdistribution measurements 6.Criticalboronconcentration

-FullPowerInitialcriticality wasachievedon85/12/84at8458hours.TheHotZeroPowerparameters aslistedin1thru4abovewerethenmeasured.

Thefluxsymmetrymappingandsubsequent powerescalation andmeasurement ofpowerdistribution andhotchannelfactorswasdelayeduntil5/23/84duetotheplantreturntocoldshutdownforsecondary chemistry concerns.

Thefollowing datasummarizes theresultsofthetestingprogram.CriticalMeasurements a~NuclearH~etDetermination:

Nuclearheatwasobservedat~4x18ampsonChannelN-41.Itwasdetermined fromthisthatalLreactivity measurements wouldbeperformed below2x18FullScaleampstostaybelownuclearheat.b.Reactiv~it ComputerCheckout:

Thereactorwasplacedonvaryingperiodstoprovideacomparison ofindicated reactivity withthatderivedfromperiodmeasurements.

Thefollowing tablesummarizes thecomputercheckout:

ControlBankTMeasured1Reactivity (PCM)TtDifference DStepsIReactorIl(M-P)x188Withdrawn IPeriod/SecondslMeasured (M)IPredicted (P)lP61826268'3157.298'523.1635.S652.5223~4536.153.1-1.25%.665-1.11%8408070526 840709.PDRADOCK05000244PPDR

)(ttIt~St'ItItr,IItIlJII4IJt qc~'Isothermal TempatureCoefficient:Heatpandcooldownratesofapproximately 18P7hr.wereestablished todetermine theisothermal temperature coefficient.

Thefollowing datasummarizes theresultsoftheaverageoftwoacceptable traces.TAccetanceIMTCIsARO-4.9INotPositiveI

-2.215+2.685IICore~MTCpDifference ConfigurationIPredicted (P)ICriteriaIMeasured (M)I(M-P)1lrNOTE:Moderator Temperature Coefficient

=ITC-(-1.66)d.ControlRodWorth:ControlRodworthwasmeasuredbyadjusting rodpositiontocompensate fordilution.

Thefollowing tablesummarizes theintegralrodworthdata.PredictMeasuredDifference CtrlI(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+5Acceptance Criteria:

Theacceptance criteriaisthatthemeasuredindividual bankintegralworthbewithin15%ofthepredicted valuesandthatthetotalworthofthreebanksbewithin185ofthepredicted value.Ifthecriterion onindividual bankworthisnotmet,anevaluation willbeperformed todetermine thecauseandanypotential impacts.Ifthecriterion intotalworthofthethreebanksisnotmet,additional bankswillbemeasureduntilthemeasurement iswithin18%oftheprediction.

Thiswillbecontinued, ifnecessary, tomeasurement atanN-1rodinsertedcondition.

TheresultofanN-lmeasurement, withappropriate allowance formeasurement uncertainty, willbecomparedtothevalueassumedintheSafetyAnalyses.

Assummarized above,Bank"B"indicated adeviation ofpredicted rodworththatexceededtheacceptance criteriaof+15%.Thetotalrodworthforthethreebankshowever,didsatisfytheacceptance criteriaof+18' 0J~~fD

~,J'Thedeviation habeenevaluated bynuclear'engineering, and,ithasbeendetermined thatproceeding tofullpowerisacceptable forthefollowing reasons.Thetotalrodworthforthethreebanksmeasurediswithin+18%ofpredicted values,therefore, satisfying theassumptions outlinedintheshutdownmargincalcu-lation.2~Theshutdownmargincalculation (Table6.3oftheNuclearDesignReport)indicates thatexcessshutdownmarginof818pcmexiststotherequiredshutdownmarginof1888pcmatBOL.3~ThemeasuredARO,D,D+Cand,estimated D+C+Bboronendpointdatacomparewelltothepredicted valuesindicating thattheBbankdeviation doesnotrepresent anunanticipated corereactivity anomaly.TheWestinghouse nucleardesignerisconducting hisownevaluation todetermine thecauseofthedeviation.

Basedonthisevaluation, additional fluxmapdataandcomparison ofoverallcoreperformanceversuspredicted throughthecycle,itcanbedetermined atalaterdatewhethertoimposeahigherDbankinsertion limittowardendofcyclewheretheshutdownmarginisattheminimum.e.BoronEnd~oint:

Thefollowing tablesummarizes theboronendpointdata.rrTDifference Con~icauration (predicated (p)(acceptance(Measured (M)((M-p)ARODInsertedD+CInserted*D+C+BInsertedl 1329122711131818+75+75+75.+7513291286118318858-21-185Acceptance Criteria:

Theaveragecriticalboronconcentration foragivenconfiguration willbecomparedtothepredicted concentration forthatconfiguration.

Theacceptance criterion willbe+75ppm.Ifthisacceptance criterion isnotmet,themeasurement datawillbereviewedandthefuelsupplierwillbeaskedtoreviewhispredictions.

Concurrent withthisreviewtheremainder ofthezeropowerphysicstestingwillbecompleted toseeifanyotherdifferences arepresentthatcouldaidindetermining thecauseofnotmeetingtheacceptance criteria.

Ifaftertheaboveactions,theacceptance criterion stillcannotbemetanevaluation willbeperformed ontheeffectofthisdifference onparameters usedintheaccidentanalysis'f theaccidentanalysisisunaffected bythisdifference, thecorewillbeallowedtogoabove5%ratedpower.

t~II~IJ8II-IIlJttIIJ4ltttLIftIftCIIII'

~~~.~NOTE:Althoughthetestingprogramdidnotspecifymeasurement ofControlBank"B"PPMBoronNorthortheBoronEndpointforD+C+BInserted, sufficientacquiredboronsampledataexistedtoincludethestatedvaluewithreasonable confidence.

FluxSymmetryandPowerDistribution:

Thefluxsymmetryfluxmapwasperformed at23.6%ratedpower.Alllocations wereevaluated totheacceptance criteriaaslistedbelow.Theonlylocations tofalloutoftheacceptance bounds,werelocations I-5andI-6,whichrecorded-14.231%and-14.233%respectively.

Thethimbleusedtopredicttheselocations isI-5.ThisspecificassemblylocationisaMixedOxideAssembly(Plutonium enriched).

Theresultswereevaluated anditwasdetermined thatmodelingofthepowerdistribution forthisassemblywasthereasonforthedifference.

Theremainder ofthemapwasingoodagreement withpredictions andverifiedthecorewasproperlyloaded.AllNuclearHotChannelfactorswerewellwithintheboundsofPlantTechnical Specifications.

Duringsubsequent powerescalation, fluxmapsweregenerated at46$,71.5%withIncore/Excore calibration performed at83%power.Following areactor/turbine tripduetoanexciterfailure,powerescalation to188%wasachieved.

The188%mapwasthentakenon6/8/84,withallHotChannelFactorswellwithintheboundsofPlantTechnical Specifi-cations.A~ccetanceCriteria:

Theacceptance criterion forafluxmapisthattheplantTechnical Specification onpeakingfactorsbemet.Asanaidinevaluating thepowerdistribution maps,thedifferences betweenmeasuredandpredicted assemblypowerlevelsarereviewed.

Generalcriteriaforthesecomparisons arethatthedifference forassemblies withrelativepower<1'belessthan15%andthedifference forassemblies withrelativepower>1.8belessthan18%.Ifthesedifferences areexceeded, anevaluation shallbeperformed toensurethatthepeakingfactorTechnical Specifications willbemet.Ifsuchanevaluation indicates thatthepeakingfactorlimitswillbemet,nofurtheractionisnecessary.

geCriticalBoronConcentration

-FullPower:Duetothenumerousdelaysasaresultofsecondary concernsencountered duringstartup,HotFullPowerSteadystateconditions werenotattaineduntil6/8/84,whichrepresents anexposureof"388MWD/MTU.Thecalculated boronconcentration atthatpointwas888PPMwithapredicated valueof828PPM.Subsequent Boronmeasurements todateindicatethepredicated tocloselyapproximate theactualvaluesobtained.

RECElVEO-REGlON 1$85JULl2Plill:52~gfi~,~r~~~~~