ML17261B092

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Responds to 900709 Request for Addl Info Re Containment Integrity Insp.Util Will Provide Preliminary Results by 900716 Re Where Groundwater Entering Annular Access Area. Meeting Proposed for Wk of 900723
ML17261B092
Person / Time
Site: Ginna Constellation icon.png
Issue date: 07/11/1990
From: MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To: JOHNSON A R
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
TASK-03-07.A, TASK-3-7.A, TASK-RR TAC-67427, NUDOCS 9007180303
Download: ML17261B092 (4)


Text

ACCELERATEDDISTRIBUTIONDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9007180303DOC.DATE:90/07/11NOTARIZED:NOFACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterAUTH.NAMEAUTHORAFFILIATIONMECREDY,R.C.RochesterGas6ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONJOHNSON,A.R.ProjectDirectorateI-3

SUBJECT:

Respondsto900709requestforaddiinforecontainmentintegrityinsp.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTR2ENCL0SIZE:TITLE:ORSubmittal:GeneralDistributionDOCKETG05000244tDNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).05000244/RECIPIENTIDCODE/NAMEPD1-3LAJOHNSON,AINTERNAL:NRR/DET/ECMB9HNRR/DST8E2NRR/DST/SICB7ENUDOCS-ABSTRACTOGC/HDS2RES/DSIR/EIBEXTERNAL:LPDRNSICCOPIESLTTRENCLRECIPIENTIDCODE/NAMEPD1-3PDNRR/DOEA/OTSB11NRR/DST/SELB8DNRR/DST/SRXB8E-8@MEGFILE01NRCPDRCOPIESLTTRENCLDDDNOTETOALL"RIDS"RECIPIENTS:DDPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR21ENCL eill/////I///I//I//////I////1/I////////ROCHESTERGASwf~ai~owiieI'iRORYANDELECTRICCORPORATIONo89EASTAVENUE,ROCHESTER,N.K14649.0001-July11,1990TCtfPHONEARKAcooKvie.546-2700U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:AllenR.JohnsonProjectDirectorateI-3Washington,D.C.20555

Subject:

ContainmentIntegrityInspectionR.E.GinnaNuclearPowerPlantDocketNo.50-244

Reference:

July9,1990NRCRequestforAdditionalInformation,(TACNo.67427),i

DearMr.Johnson:

InresponsetotheNRC'sJuly9,1990requestforadditionalinformation,RG&Eisprovidingthefollowingresponsesinanexpeditiousmanner.RG&Edoesnotbelievethatgroundwaterisenteringtheannularaccessareaaroundcontainmentfrombeneathcontainment,assuspectedbyNRCinspectors,butfrombehindthesheetpilingthatformtheretainingwallintheeasternlyquadrantoftheintermediatebuildingsub-basement.Becausethisareaisclassifiedasaconfinedspace,andiscontaminated,theeffortnecessarytoconfirmthisinformationisdifficult.Nonetheless,thismajoreffortisunderway.PreliminaryresultsareexpectedbyJuly16,withdetailedresultsexpectedbyJuly20.RG&Ealsodoesnotexpectthatanydegradationofcontainmentstructuralmembersisoccurringatthistime.WehavemetallnecessarysurveillancetestingrequirementsneededtoconformtotheGinnaTechnicalSpecifications,includingmanyIntegratedLeakRateTests(ILRT)andtendonsurveillancetests(reviewedinSEPTopicIII-7.A).Resultsfromthe1989ILRTwereexcellentandthejust-completedtendontestingconfirmedthatalllift-offtestsmetacceptancecriteria,andallinspectedtendonwireswerein"as-new"condition.RG&Ewillreviewtheoriginalstructuraldesignrequirementsofthecontainmentandassesstheimpactoftherecentlydeterminedgroundwaterlevelonthedesign.Forstructuraldetailswhichareinaccessibleduetolocation(highradiationareaintheRHRroom,orencasedinrockorconcrete)absolutelydefinitiveconclusionsmaynotbepossible.However,5'00718030390'0711,PDRADOCK05000244QPDCourbestengineeringjudgmentwillbeusedtoprovidereasonable)04~g5~

11J~'Iir assurancethattheproperstructuralfunctionscanbemet.Thisapproachisconsistentwithother,typesofsurveillancetests(e.g.MOVATS,testinginresponsetoGenericLetter89-10)whereaduplicationofpost-accidentfunctionscannotbeachieved,butgoodjudgmentisusedtoextrapolatetheabilitytomeetsafetyfunctionsbasedoncurrentavailabletestingmethodologies.Anyreasonablyavailableinformation,whetherNRCorindustrygenerated,willbeusedtohelpusperformsuchcorrelations.BecauseoftheuniquenatureoftheGinnacontainmentdesign,asdiscussedinourJuly,9telecon,RG&Eproposesthat.theNRCtechnicalreviewersandRG&Epersonneldiscussourfindingsandconclusionsatamutuallyacceptabletime,suchastheendoftheweekofJuly23,attheRG&Eoffices.Verytrulyyours,RobertC.MecredyDivisionManagerNuclearProductionGJW/112Attachmentxc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.'0555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector