ML17146B102

Susquehanna Steam Electric Station Unit 2 Cycle 3 Proposed Startup Physics Tests Summary Description.

ML17146B102
Person / Time
Site:	Susquehanna
Issue date:	11/30/1987
From:	PENNSYLVANIA POWER & LIGHT CO.
To:
Shared Package
ML17146B090	List: ML17146B089 ML17146B092 ML17146B094 ML17146B095 ML17146B096 ML17146B102 ML18040B194
References
PROC-871130, NUDOCS 8801080091
Download: ML17146B102 (5)

Text

SUSQUEHANNASESUNIT2CYCLE3PROPOSEDSTARTUPPHYSICSTESTSSUMMARYDESCRIPTIONNOVEMBER1987PENNSYLVANIAPOWER8(LIGHTCOMPANY880i08009i87i223.PDRADQCK05000388PDRggg>>/>>/>>

~r SUSUEHANNASESUNIT2CYCLE3PROPOSEDSTARTUPPHYSICSTESTSSUMMARYDESCRIPTIONSusquehannaSESUnitinspectionoutageoncommercialoperationteststoassurethat,proposedtestsalong2willbeshuttingdownforitssecondrefuelingandMarch5,1988.PriortoresumptionoffullpowerforCycle3,PPGLplanstoperformaseriesofstartupthereloadcoreconformstothedesign.Alistofthesewithabriefdescriptionforeachisprovidedbelow.1)CoreLoadinVerificationPurpose:Toassurethecoreiscorrectlyloadedperdesign.Description:Thecorewillbevisuallycheckedtoverifycorrectloading.Anunderwatervideocameraorsuitabledevicewillbeusedtorecordfuelassemblyserialnumbers,orientations,corelocations,andpropercoreplateseating.Areviewofthevideotapewillbeperformedandwillserveasanindependentverificationofthecoreloading.AnydiscrepanciesdiscoveredwillbepromptlycorrectedandtheaffectedareasreverifiedpriortoUnit2Cycle3startup.2)ControlRodFunctional(InsertandWithdrawalChecks)Purpose:Toassurepropercontrolrodfunction.Description:Acontrolrodfunctionaltest,whichincludesmobilityandovertravelchecks,willbeperformedoneachcontrolcellloadedinitsfinalconfiguration.Coresubcriticalitywillbedemonstratedanddocumentedaseachcontrolrodisfunctionallytested.3)SubcriticalShutdownMarginDemonstrationPurpose:ToassurethatatleasttheminimumrequiredShutdownMarginexistswiththestrongestworthcontrolrodfullywithdrawn.Description:ThistestwillverifythatatleasttherequiredamountofShutdownMarginismaintainedwithoutdeterminingtheactualamount.Theanalyticallydeterminedstrongestworthcontrolrod(oritssymmetriccounterpart)isfullywithdrawn;diagonallyadjacentcontrolrods(oneatatime)arethenslowlynotchedout,verifyingsubcriticalityateachstep,untiltheanalyticallydeterminedreactivityworthofthediagonallyadjacentcontrolrodsattheirrespectivenotchpositionjustequalsorslightlyexceedstherequiredamountofShutdownMargin.VerificationatthisstepthatthecoreisstillsubcriticaldemonstratesthatatleasttherequiredamountofShutdownMarginexists.

4)In-SeuenceCriticalandShutdownMarginDeterminationPurpose:a)TodeterminetheactualamountofShutdownMargin.b)Tocomparepredictedversusactualcriticalcontrolrodpositions.Description:Thistestwillbeperformedaspartofthenormalstartup.Controlrodsarepulledingrouporderintheirnormalsequenceuntilcriticalityisachieved.Takingintoaccounttheperiodandmoderatortemperaturecoefficientcorrections,theShutdownMarginisdeterminedbycalculation.Inaddition,toassurethatthereisnoreactivityanomaly,theactualcriticalcontrolrodpositionisverifiedtobewithin1%~k/kofthepredictedcriticalcontrolrodposition.Purpose:a)ToassureproperoperationoftheTIPsystem.b)Description:Tocheckcoresymmetry.IAgrossasymmetrycheckwillbeperformedaswellasadetailedstatisticaluncertaintyevaluationoftheTIPsystem.AcompletesetofTIPdatawillbeobtainedatasteady-statepowerlevelgreaterthan75%ofratedpower.AtotalaveragedeviationoruncertaintywillbedeterminedforallsymmetricTIPpairsaswellasamaximumabsolutedeviation.TheresultswillbeanalyzedtoassureproperoperationoftheTIPsystemandsymmetryofthecoreloading.