ML17229A368
| ML17229A368 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 06/03/1997 |
| From: | STALL J A FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17229A369 | List: |
| References | |
| RTR-NUREG-0800, RTR-NUREG-800 GL-95-05, GL-95-5, L-97-141, NUDOCS 9706090306 | |
| Download: ML17229A368 (8) | |
Text
CATEGORY1REGULATOINFORMATIPNDISTR'IBUTIONTEM(RIDS)ACCESSIONNBR:9706090306DOC.DATE:97/06/03NOTARIZED:NODOCKET¹FACIAL:50-.335St.LuciePlant,Unit1,FloridaPower&LightCo.05000335AUTH.NAM"AUTHORAFFILIATIONS;.ALL,J.A.FloridaPower.&LightCo.RECIP.NAMERECIPIENTAFFILIATIONoe/DocumentControlBranch(DocumentControDesk)
SUBJECT:
ForwardsRev1toSAIC-97/1008,"AnalysisofRadiologicalConsequencesofMainSteamLineBreakOutsideContainmentforStLucieUnit1NuclearPowerPlantUsingNUREG-0800StdReviewPlanSection15.1.5,AppA."DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTR)ENCIjSIZE:Q+DQTITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD2-3LA,WIENSiL.COPIESLTTRENCL1111RECIPIENTIDCODE/NAMEPD2-3PDCOPIESLTTRENCL11INTERNAL:ACRSNRR/DE/ECGB/ANRR/DRCH/HICBNRR/DSSA/SRXBOGC/HDS3EXTERNAL:NOAC111111111011FILECENTERNRR/DSSA/SPLBNUDOCS-ABSTRACTNRCPDR111111,111'1NOTETOALL"RIDS"RECIPIENTS:PLEASEHELP"USTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXTi415-2083)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTAL.NUMBEROFCOPIESREQUIRED:LTTR14ENCL13, FloridaPower&LightCompany,6501SouthOceanOrive,JensenBeach,FL34957June3,1997L-97-14110CFR50.4U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555RE:St.LucieUnit1DocketNo.50-335DoseAssessmentCorrectionThepurposeofthisletteristoprovidearevisiontothedoseassessmentsubmittedbyFloridaPower"8cLightCompany(FPL)onApril4,1997,andtoprovideadditionalinformationontheFall1996steamgeneratorinspectionresults.Attachment1providestherequestedclarificationsandadditionalinformation'ontheFPLsteamgeneratorinspectionresultsforSt.LucieUnit1.Attachment2providestherevisedSt.LucieUnit1doseassessmentusingStandardReviewPlanSection15.1.5methodology.Thereviseddoseassessment,preparedbyScientificApplicationsInternationalCorporation(SAIC)forFPL,isSAICReport,SAIC-97/1008Revision1,AnalysisoftheRadiologicalConsequencesofaMainSteamLineBreakOutsideContainmentfortheSt.LucieUnit1NuclearPowerPlantUsingNUREG-0800StandardReviewPlan15.1.5AppendixA,datedApril29,1997.Revision1oftheSAICreportincorporatesaradionuclidereleasescenariowhichprovidesmorerealisticpostulateddoseswhencomparedtodosesestimatedinRevision0,'.whichwasprovidedasAttachment2toourApril4,1997submittal(L-97;90).TherevisedreportprovidesaSRPdosecalculationforanassumedpre-accidentonegpmprimary-to-secondaryleakandavariable,butconstant,post-accidentprimary-to-secondaryleakrateforapostulatedmainsteamlinebreak(MSLB)outsidecontainment.Thethreecaseswhichwereanalyzedare:(1)apreexistingiodinespikeintheprimarycoolantsystem,(2)anaccidentinducediodinespike,and(3)anaccidentinduced1.61percent(%)fuelfailure.Theboundingresultsofthisanalysisaretabulatedbelowandshowthemaximumallowablepost-accidentprimary-to-secondaryleakraterequiredtoreachtheregulatorydoselimitssetforthin10CFR100and10CFR50,AppendixA,GeneralDesignCriteria19,asindicatedinSRPSection15.1.5,AppendixA.Sincethethyroiddoseismorelimitingthanthewholebodydose,onlythelimitingresultsarepresented.Theseresultsshowthat,fortheboundingcaseofapostulatedMSLBwithinducedsteamgeneratortubeleakagefollowing15monthsofoperation,thecalculatedupperboundleakageoflessthan4gpmfromallformsofdegradation,issubstantiallybelowthe6.8gpmleakratewhichisconsideredacceptableunderthependingsteamgeneratorrulemakingcriteria,inthattheresultsdonotexceedthe10CFR100and10CFR50AppendixAgeneraldesigncriteria(GDC)19accidentdoselimits.a((rrcmuuysvuiyanr;IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIADDI(
St.LucieUnit1DocketNo.50-335L-97-141Page2RegulatoryThyroidDoseLimitingPost-AccidentPrimary-to-SecondaryLeakRateDoseLocationControlRoomExclusionAreaBoundary(SiteBoundary)LowPopulationZoneLPZRegulatoryThyroidDoseLimit(REM)3030or300'0or300'reexistingIodineSpikeCase(gpm)674303,000ConcurrentIodineSpikeCase(gpm)1961579881.61.%FailedFuelCase(gpm)6.833Fortheconcurrentiodinespikecase,theregulatorylimitis30REM;fortheothercasestheregulatorydoselimitis300REMDuringaJuly3,1996,meetingwiththeNRC,FloridaPowerandLightCompany(FPL)committedtoprovidetheresultsoftheSt.LucieUnit1steamgeneratorruntimeanalysistotheNRCwithin90daysofthestartupfromthe1996refuelingoutage(SL1-14).FPLletterL-96-273datedOctober24,1996,providedFPL'splanstooperatetheUnit1steamgeneratorsforfifteen(15)months(i.e.,throughOctober23,1997).FPLlettersL-97-47datedFebruary21,1997,andL-97-90datedApril4,1997,supplementedthisinformationinresponsetoanNRCRAIdatedJanuary23,1997.TheruntimeanalysiswasaphysicallybasedanalysisthatusedtheguidancecontainedinDraftRegulatoryGuide(RG)1.121,GenericLetter95-05,andtheDraftRegulatoryGuide,SteamGeneratorTubeIntegrity.Thisletterdoesnotcontainanynewregulatorycommitments.FPLispreparedtomeetwiththeNRCtodiscusstheresultsofthisandanyotherpreviouslysubmittedanalyses.Pleasecontactusifyouhaveanyadditionalquestions.Verytrulyours.A.StallVicePresidentSt.LuciePlantJAS/GRMAttachmentscc:RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlant St.LucieUnit1DocketNo.50-335L-97-141Attachment1Page1Cycle14SteamGeneratorRuntimeAnalysisI3dJlpNRCQuestion1:Clarifythefollowingstatementonpage60ofEnclosure2ofyourOctober24,1996submittal,"St.LucieUnit1;DocketNo.50-335;SteamGeneratorRunTimeAnalysisforCycle14""Thenumberofsimulatedleakingdefectsintheentiresteamgeneratorisobtainedbyfirstsamplingfromabinomialdistributionusingtheaveragelevelfrequencyofleakcomputationsandthenumberofequivalentlevelsinthesteamgenerator?"FPLResponsetoQuestion1:Thenumberofsimulatedleakingdefectsfortheentiresteamgeneratorisobtainedinatwo-stepprocess.Thefirststepisthecomputationofthenumberofleakingdefectsatanaveragelevel.Asinthestructuralintegrityportionoftheanalysis(Section5.1),the'average'evelcorrespondsphysicallytoroughlyonetubesupportlevel.ThenumberofleakingdefectsforthisaveragesupportisobtainedbysamplingfromaBinomialdistributionusingtheprobabilityofanyleakingdefectintheaveragesupport.TheresultofthisprocessisatrialoutcomeofNleakingdefects(N=0,1,2,3,.....,k)fortheaveragesupport.Thesecondstepinthecomputationisthesummationofleakingdefectsoveralllevelsinthesteamgenerator.AsinSection5.1ofthereport,thenumberofsuchlevelsis15forthemostaffectedsteamgenerator.ThesummationprocessisordinaryadditionunlikethatforprobabilityofburstwhichisaBooleansummation.NRCQuestion2:InTable4-1ofEnclosure4toyourOctober24,1996submittal,themaximumbobbindepthfortubeR15L55at1Hisrecordedas"94/64."Pleaseclarifywhatismeantbythisentry.FPLResponsetoQuestion2:Table4-1ofEnclosure4toourOctober24,1996submittalprovidesresultsofIn-situPressureTestsconductedfordefectindicationsinSt.LucieUnit1steamgeneratortubing.TheseresultswerediscussedwiththeStaffatthecompletionofthetesting.Priortoin-situpressuretesting,alltestcandidateindicationswerereviewedbyleadanalysispersonnel.Themaximumbobbin
!Jiiic())~v(vSt.LucieUnit1DocketNo.50-335L-97-141Attachment1Page2depthforR15L55at1Hwassubsequentlylistedas"94/64"duetothecomplexnatureoftheindication.Theoverallindicationismeasuredas64%throughwall.Asmallercomponentoftheindication,however,whenmeasuredseparately,measures94%throughwall.In-situtestingforthisindicationdemonstratedthat,whileleakagedidoccur,adequatestructuralmarginsexisted.Thespecificentry(94/64)reflectsthisresult.NRCQuestion3:InHgures13and14ofAppendixAtoEnclosure1,thenumberofindicationswithdepthsbetween0-19%,20-39%,and)40%wereprovided.Pleaseprovideabreakdownofthenumberofindicationsbetween40-50%,50-60%,...and90-100%fortheindicationsgreaterthan40%in1996.Also,pleasestatewhetherthedepthsaremaxdepthoraveragedepth.Ifnotmaxdepthpleaseprovidemaxdepthreadings.FPLResponsetoQuestion3:Abreakdownofthenumberofindicationsbetween40-50%,50-60%,...and90-100%forindicationsgreaterthan40%in1996isprovidedinTable1forsteamgeneratorAandTable2forsteamgeneratorB.Dataanalysispersonnelwereinstructedtoprovidemaximumeddycurrentdepthestimatesforallindications.AtSt.LucieUnit1,bobbincoilindicationsateggcrates,thatare2.5voltsorgreaterinamplitude,mayexhibitacomplexsignalindicativeofanindicationwithvariabledepth.AsdiscussedinourresponsetoQuestion2,suchanindicationatR15L55at1HinsteamgeneratorBwasnotedduringreviewspriortoin-situpressuretesting.ThisindicationisincludedinTable2as64%,althoughasmallercomponentoftheindicationwaslatermeasuredas94%throughwall.Asamplereviewofbobbindataverifiedthateggcrageindicationslessthan2.5voltsinamplitudedonotexhibitsuchcomplexsignals.Inaddition,allremainingeggcrateindicationsmeasuring2.0voltsorgreaterwerereviewedandnoadditionalexceptionswerenoted.
St.LucieUnit1DocketNo.50-335L-97-141Attachment1Page3Elevation01H02H03H04H05H06H07H08H09H10H01C02C03C04C05C06C07C08C09C10CVS1VS2VS3TSHTEHTSCTECDC8DHBDHTDCT3728Table1St.LucleUnit1-SGA1996,>40%DepthBreakdownNQ140A9%50-59%60-69%70-79%80-89%844127153246471522136208'201322121641822790%+TOTALS1721136738321271009889527110260730000000TOTALS3021647324573NQI-NonQuantifiableIndication01H,02H....-1stsupporthotside01C,02C....-1st,2ndsupportcoldsideVS1,'S2....-1st,2ndVerticalStrapfromhotsideDHB,DCB-DiagonalStrap,HotorColdSide,BottomEdgeDHT,DCT-DiagonalStrap,HotorColdSide,TopEdgeTSH,TSC-TubesheetHotorCold,SecondaryfaceTEH,TEC-TubeEndHotorColdSide
.~C.f~f St.LucieUnit1DocketNo.50-335L-97-141Attachment1Page4Table2Elevation01H02H03H04H05H06H07H08H09H10H01C02C03C04C05C06C07C08C09C10CVS1VS2VS3TSHTEHTSCTECDCBDHBDHTDCT10255365491712610St.LucieUnit1-SGB1996,>40%DepthBreakdownNQI40-49%50-59%60-69%70-?9%80-89%17337311617580167'401072322542062241261190%+TOTALS279108623121107800117686875019181420400000TOTALS44797602721659NQI-NonQuantifiableIndication01H,02H....-1stsupporthotside01C,02C....-1st,2ndsupportcoldsideVS1,VS2....-1st,2ndVerticalStrapfromhotsideDHB,DCB-DiagonalStrap,HotorColdSide,BottomEdgeDHT,DCT-DiagonalStrap,HotorColdSide,TopEdgeTSH,TSC-TubesheetHotorCold,SecondaryfaceTEH,TEC-TubeEndHotorColdSide