ML17229A368

Forwards Rev 1 to SAIC-97/1008, Analysis of Radiological Consequences of Main Steam Line Break Outside Containment for St Lucie Unit 1 Nuclear Power Plant Using NUREG-0800 Std Review Plan Section 15.1.5,App A.

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: L-97-141, Final Analysis of Radiological Consequences of Main Steam Line Break Outside Containment for St Lucie Unit 1 Nuclear Power Plant Using NUREG-0800 Std Review Plan Section 15.1.5, App a, Rev 1 ML17229A368
References
RTR-NUREG-0800, RTR-NUREG-800 GL-95-05, GL-95-5, L-97-141, NUDOCS 9706090306
Download: ML17229A368 (8)

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CATEGORY1REGULATOINFORMATIPN DISTR'IBUTION TEM(RIDS)ACCESSION NBR:9706090306 DOC.DATE:

97/06/03NOTARIZED:

NODOCKET¹FACIAL:50-.335 St.LuciePlant,Unit1,FloridaPower&LightCo.05000335AUTH.NAM" AUTHORAFFILIATION S;.ALL,J.A.

FloridaPower.&LightCo.RECIP.NAME RECIPIENT AFFILIATION oe/DocumentControlBranch(Document ControDesk)

SUBJECT:

ForwardsRev1toSAIC-97/1008, "Analysis ofRadiological Consequences ofMainSteamLineBreakOutsideContainment forStLucieUnit1NuclearPowerPlantUsingNUREG-0800 StdReviewPlanSection15.1.5,App A."DISTRIBUTION CODE:AOOIDCOPIESRECEIVED:LTR

)ENCIjSIZE:Q+DQTITLE:ORSubmittal:

GeneralDistribution NOTES:RECIPIENT IDCODE/NAME PD2-3LA,WIENSiL.COPIESLTTRENCL1111RECIPIENT IDCODE/NAME PD2-3PDCOPIESLTTRENCL11INTERNAL:

ACRSNRR/DE/ECGB/A NRR/DRCH/HICB NRR/DSSA/SRXB OGC/HDS3EXTERNAL:

NOAC111111111011FILECENTERNRR/DSSA/SPLB NUDOCS-ABSTRACT NRCPDR111111,111'1NOTETOALL"RIDS"RECIPIENTS:

PLEASEHELP"USTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMOWFNSD-5(EXTi 415-2083)

TOELIMINATE YOURNAMEFROMDISTRIBUTION LISTSFORDOCUMENTS YOUDON'TNEED!TOTAL.NUMBEROFCOPIESREQUIRED:

LTTR14ENCL13, FloridaPower&LightCompany,6501SouthOceanOrive,JensenBeach,FL34957June3,1997L-97-14110CFR50.4U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555RE:St.LucieUnit1DocketNo.50-335DoseAssessment Correction Thepurposeofthisletteristoprovidearevisiontothedoseassessment submitted byFloridaPower"8cLightCompany(FPL)onApril4,1997,andtoprovideadditional information ontheFall1996steamgenerator inspection results.Attachment 1providestherequested clarifications andadditional information'on theFPLsteamgenerator inspection resultsforSt.LucieUnit1.Attachment 2providestherevisedSt.LucieUnit1doseassessment usingStandardReviewPlanSection15.1.5methodology.

Thereviseddoseassessment, preparedbyScientific Applications International Corporation (SAIC)forFPL,isSAICReport,SAIC-97/1008 Revision1,AnalysisoftheRadiological Consequences ofaMainSteamLineBreakOutsideContainment fortheSt.LucieUnit1NuclearPowerPlantUsingNUREG-0800 StandardReviewPlan15.1.5AppendixA,datedApril29,1997.Revision1oftheSAICreportincorporates aradionuclide releasescenariowhichprovidesmorerealistic postulated doseswhencomparedtodosesestimated inRevision0,'.which wasprovidedasAttachment 2toourApril4,1997submittal (L-97;90).

TherevisedreportprovidesaSRPdosecalculation foranassumedpre-accident onegpmprimary-to-secondary leakandavariable, butconstant, post-accident primary-to-secondary leakrateforapostulated mainsteamlinebreak(MSLB)outsidecontainment.

Thethreecaseswhichwereanalyzedare:(1)apreexisting iodinespikeintheprimarycoolantsystem,(2)anaccidentinducediodinespike,and(3)anaccidentinduced1.61percent(%)fuelfailure.Theboundingresultsofthisanalysisaretabulated belowandshowthemaximumallowable post-accident primary-to-secondary leakraterequiredtoreachtheregulatory doselimitssetforthin10CFR100and10CFR50,AppendixA,GeneralDesignCriteria19,asindicated inSRPSection15.1.5,AppendixA.Sincethethyroiddoseismorelimitingthanthewholebodydose,onlythelimitingresultsarepresented.

Theseresultsshowthat,fortheboundingcaseofapostulated MSLBwithinducedsteamgenerator tubeleakagefollowing 15monthsofoperation, thecalculated upperboundleakageoflessthan4gpmfromallformsofdegradation, issubstantially belowthe6.8gpmleakratewhichisconsidered acceptable underthependingsteamgenerator rulemakingcriteria, inthattheresultsdonotexceedthe10CFR100and10CFR50AppendixAgeneraldesigncriteria(GDC)19accidentdoselimits.a((rrcmuuysvuiyanr;IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ADDI(

St.LucieUnit1DocketNo.50-335L-97-141Page2Regulatory ThyroidDoseLimitingPost-Accident Primary-to-Secondary LeakRateDoseLocationControlRoomExclusion AreaBoundary(SiteBoundary)

LowPopulation ZoneLPZRegulatory ThyroidDoseLimit(REM)3030or300'0or300'reexisting IodineSpikeCase(gpm)674303,000Concurrent IodineSpikeCase(gpm)1961579881.61.%FailedFuelCase(gpm)6.833Fortheconcurrent iodinespikecase,theregulatory limitis30REM;fortheothercasestheregulatory doselimitis300REMDuringaJuly3,1996,meetingwiththeNRC,FloridaPowerandLightCompany(FPL)committed toprovidetheresultsoftheSt.LucieUnit1steamgenerator runtimeanalysistotheNRCwithin90daysofthestartupfromthe1996refueling outage(SL1-14).

FPLletterL-96-273datedOctober24,1996,providedFPL'splanstooperatetheUnit1steamgenerators forfifteen(15)months(i.e.,throughOctober23,1997).FPLlettersL-97-47datedFebruary21,1997,andL-97-90datedApril4,1997,supplemented thisinformation inresponsetoanNRCRAIdatedJanuary23,1997.Theruntimeanalysiswasaphysically basedanalysisthatusedtheguidancecontained inDraftRegulatory Guide(RG)1.121,GenericLetter95-05,andtheDraftRegulatory Guide,SteamGenerator TubeIntegrity.

Thisletterdoesnotcontainanynewregulatory commitments.

FPLispreparedtomeetwiththeNRCtodiscusstheresultsofthisandanyotherpreviously submitted analyses.

Pleasecontactusifyouhaveanyadditional questions.

Verytrulyours.A.StallVicePresident St.LuciePlantJAS/GRMAttachments cc:RegionalAdministrator, RegionII,USNRCSeniorResidentInspector, USNRC,St.LuciePlant St.LucieUnit1DocketNo.50-335L-97-141Attachment 1Page1Cycle14SteamGenerator RuntimeAnalysisI3dJlpNRCQuestion1:Clarifythefollowing statement onpage60ofEnclosure 2ofyourOctober24,1996submittal, "St.LucieUnit1;DocketNo.50-335;SteamGenerator RunTimeAnalysisforCycle14""Thenumberofsimulated leakingdefectsintheentiresteamgenerator isobtainedbyfirstsamplingfromabinomialdistribution usingtheaveragelevelfrequency ofleakcomputations andthenumberofequivalent levelsinthesteamgenerator?"

FPLResponsetoQuestion1:Thenumberofsimulated leakingdefectsfortheentiresteamgenerator isobtainedinatwo-stepprocess.Thefirststepisthecomputation ofthenumberofleakingdefectsatanaveragelevel.Asinthestructural integrity portionoftheanalysis(Section5.1),the'average'evel corresponds physically toroughlyonetubesupportlevel.ThenumberofleakingdefectsforthisaveragesupportisobtainedbysamplingfromaBinomialdistribution usingtheprobability ofanyleakingdefectintheaveragesupport.TheresultofthisprocessisatrialoutcomeofNleakingdefects(N=0,1,2,3,.....,k) fortheaveragesupport.Thesecondstepinthecomputation isthesummation ofleakingdefectsoveralllevelsinthesteamgenerator.

AsinSection5.1ofthereport,thenumberofsuchlevelsis15forthemostaffectedsteamgenerator.

Thesummation processisordinaryadditionunlikethatforprobability ofburstwhichisaBooleansummation.

NRCQuestion2:InTable4-1ofEnclosure 4toyourOctober24,1996submittal, themaximumbobbindepthfortubeR15L55at1Hisrecordedas"94/64."Pleaseclarifywhatismeantbythisentry.FPLResponsetoQuestion2:Table4-1ofEnclosure 4toourOctober24,1996submittal providesresultsofIn-situPressureTestsconducted fordefectindications inSt.LucieUnit1steamgenerator tubing.Theseresultswerediscussed withtheStaffatthecompletion ofthetesting.Priortoin-situpressuretesting,alltestcandidate indications werereviewedbyleadanalysispersonnel.

Themaximumbobbin

!Jiiic())~v(vSt.LucieUnit1DocketNo.50-335L-97-141Attachment 1Page2depthforR15L55at1Hwassubsequently listedas"94/64"duetothecomplexnatureoftheindication.

Theoverallindicationismeasuredas64%

throughwall.Asmallercomponentof theindication, however,whenmeasuredseparately, measures94%throughwall.In-situtestingforthisindication demonstrated that,whileleakagedidoccur,adequatestructural marginsexisted.Thespecificentry(94/64)reflectsthisresult.NRCQuestion3:InHgures13and14ofAppendixAtoEnclosure 1,thenumberofindications withdepthsbetween0-19%,20-39%,and)40%wereprovided.

Pleaseprovideabreakdown ofthenumberofindications between40-50%,50-60%,...and90-100%fortheindications greaterthan40%in1996.Also,pleasestatewhetherthedepthsaremaxdepthoraveragedepth.Ifnotmaxdepthpleaseprovidemaxdepthreadings.

FPLResponsetoQuestion3:Abreakdown ofthenumberofindications between40-50%,50-60%,...and90-100%forindications greaterthan40%in1996isprovidedinTable1forsteamgenerator AandTable2forsteamgenerator B.Dataanalysispersonnel wereinstructed toprovidemaximumeddycurrentdepthestimates forallindications.

AtSt.LucieUnit1,bobbincoilindications ateggcrates, thatare2.5voltsorgreaterinamplitude, mayexhibitacomplexsignalindicative ofanindication withvariabledepth.Asdiscussed inourresponsetoQuestion2,suchanindication atR15L55at1Hinsteamgenerator Bwasnotedduringreviewspriortoin-situpressuretesting.Thisindication isincludedinTable2as64%,althoughasmallercomponent oftheindication waslatermeasuredas94%throughwall.Asamplereviewofbobbindataverifiedthateggcrageindications lessthan2.5voltsinamplitude donotexhibitsuchcomplexsignals.Inaddition, allremaining eggcrateindications measuring 2.0voltsorgreaterwerereviewedandnoadditional exceptions werenoted.

St.LucieUnit1DocketNo.50-335L-97-141Attachment 1Page3Elevation 01H02H03H04H05H06H07H08H09H10H01C02C03C04C05C06C07C08C09C10CVS1VS2VS3TSHTEHTSCTECDC8DHBDHTDCT3728Table1St.LucleUnit1-SGA1996,>40%DepthBreakdown NQ140A9%50-59%60-69%70-79%80-89%844127153246471522136208'201322121641822790%+TOTALS1721136738321271009889527110260730000000TOTALS3021647324573NQI-NonQuantifiable Indication 01H,02H....-1stsupporthotside01C,02C....-1st,2ndsupportcoldsideVS1,'S2....

-1st,2ndVerticalStrapfromhotsideDHB,DCB-DiagonalStrap,HotorColdSide,BottomEdgeDHT,DCT-DiagonalStrap,HotorColdSide,TopEdgeTSH,TSC-Tubesheet HotorCold,Secondary faceTEH,TEC-TubeEndHotorColdSide

.~C.f~f St.LucieUnit1DocketNo.50-335L-97-141Attachment 1Page4Table2Elevation 01H02H03H04H05H06H07H08H09H10H01C02C03C04C05C06C07C08C09C10CVS1VS2VS3TSHTEHTSCTECDCBDHBDHTDCT10255365491712610St.LucieUnit1-SGB1996,>40%DepthBreakdown NQI40-49%50-59%60-69%70-?9%80-89%17337311617580167'401072322542062241261190%+TOTALS279108623121107800117686875019181420400000TOTALS44797602721659NQI-NonQuantifiable Indication 01H,02H....-1stsupporthotside01C,02C....-1st,2ndsupportcoldsideVS1,VS2....-1st,2ndVerticalStrapfromhotsideDHB,DCB-DiagonalStrap,HotorColdSide,BottomEdgeDHT,DCT-DiagonalStrap,HotorColdSide,TopEdgeTSH,TSC-Tubesheet HotorCold,Secondary faceTEH,TEC-TubeEndHotorColdSide