ML17059A519

Forwards Response to Request for Suppl Info Re GL 94-03, Intergranular Stress Corrosion Cracking of Core Shrouds in Bwrs. W/One Oversize Drawing

ML17059A519
Person / Time
Site:	Nine Mile Point
Issue date:	11/04/1994
From:	TERRY C D NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17059A520	List: ML17059A519 ML17059A521 ML17059A522 ML18040A297
References
GL-94-03, GL-94-3, NMP1L-0874, NMP1L-874, TAC-M90102, NUDOCS 9411160218
Download: ML17059A519 (4)

Text

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REGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)RECIPIENT "IDCODE/NAME PM/BRINKMAN,D.

INTERNA:-FIL~CENTER~01'RR/DE/EME BNRR/DSSA/SRXB COPIESLTTRENCL111111NRR/DE/EMCB NRR/DORS/OEAB 111111ACCESSION NBR:9411160218 DOC.DATE:

94/11/04NOTARIZED:

NODOCKETFACIL:50-220 NineMilePointNuclearStation,Un't1,NiagaraPowe05000220AUTH.NAMEAUTHOR:AFFILIATION TERRY,C.D.

NiagaraMohawkPowerCorp.RECIP.NAME RECIPIENT AFFILIATION DocumentControlBranch(Document ControlDesk)

SUBJECT:

Forwardsresponsetorequest.forsupplinforeGL94-03,"Intergranular StressCorrosion CrackingofCoreShroudsinBWRs."DISTRIBUTION CODE:A018DCOPIESRECEIVEDLTRENCLSIZE:TITLE:GL94-03Intergranular StressCorrosion CrackingofCoreShroudsinBNOTES:lgRECIPIENT COPIESIDCODE/NAME LTTRENCLEXTERNAL:

NRCPDR11NOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEiVASTE!CONTACI'TIIE DOCUiIE4T CONTROLDESK,ROOMP!-37(EXT.504-2083)TOELIXIINATEYOURNAi!EFROTIDISTRIBUTION LISTSFORDOCUMENTS YOUDON"I'LED!

TOTALNUMBEROFCOPIESREQUIRED:

LTTR7ENCL7

gMQogl+5fK NINEMILEPOINTNUCLEARSTATION/P.O.

BOX63,LYCOMING, NEWYORK13093/TELEPMONE (315)343-2110November4,1994NMP1L0874U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, DC20555RE:NineMilePointUnit1DocketNo.50-220DPR-63

Subject:

ResponsetoRequestforSupplemental Information Regarding GenericLetter94-03,"Intergranular StressCorrosion CrackingofCoreShroudsinBoilingWaterReactors" (TACNo.M90102)Gentlemen:

ByletterdatedAugust23,1994(NMP1L0852),NiagaraMohawkprovidedaresponsetoGenericLetter94-03,"Intergranular StressCorrosion CrackingofCoreShroudsinBoilingWaterReactors,"

forNineMilePointUnit1(NMP1).Additional information wasprovidedinNiagaraMohawk'sSeptember 26,1994letter(NMP1L0863)inresponsetotheStaff'srequestforadditional information ofSeptember 16,1994.AttheStaff'srequest,NiagaraMohawkmadeapresentation atNRRHeadquarters onOctober14,1994tofurtheraddresstheNMP1coreshroud,specifically withregardtotheH8shroudweld.ByletterdatedOctober26,1994,theStaffrequested thatNiagaraMohawksupplement itsresponsetoGenericLetter94-03basedontheresultsoftheOysterCreekcoreshroudinspection.

Theenclosure tothisletterrespondstotheStaff'sOctober26,1994requestforsupplemental information.

Thedetailedanalysesprovidedinthissupplement confirmourGenericLetter94-03submittal conclusion thatcontinued operation ofNMP1isjustified untilthescheduled February1995refueloutage.Thisconclusion remainsbasedontheextremely lowprobability thatthecoreshroudwouldfailtomeetitsdesignbasisstructural integrity marginduringthistimeperiod,coupledwiththeextremely lowoverallprobabilistic riskestimate.

Verytrulyyours,C.D.TerryVicePresident

-NuclearEngineering 9411160218 941104PDRADOCK05000220PDR

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