ML17261B069

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Discusses Testing Frequency for Insp of Incore Neutron Monitoring Sys Thimble Tubes,Per NRC Bulletin 88-009.Thimble Tube Indicating Greatest Wear Recently Repositioned in Effort to Minimize Future Wear
ML17261B069
Person / Time
Site: Ginna Constellation icon.png
Issue date: 06/01/1990
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
IEB-88-009, IEB-88-9, NUDOCS 9006080186
Download: ML17261B069 (3)


Text

ACCELERATEDDTRIBUTIONDEMONS~TIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9006080186'OC.DATE:90/06/01NOTARIZED:YESDOCKETÃ"FACIL:50-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG05000244AUTH.NAMEAUTHORAFFILIATIONMECREDY,R.C.RochesterGas&ElectricCorp.RECIP.NAMERECIPIENTAFFILIATIONJOHNSON,A.R.ProjectDirectorateI-3

SUBJECT:

Discussestestingfrequencyforinspofincoreneutronmonitoringsysthimbletubes,oerBulletin88-009.DISTRIBUTIONCODE:IEISDCOPIESRECEIVED:LTRJENCL0SIZE:TITLE:Bulletin88-09-ThimbleTubeThinningznWestinghouseReactorsNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).05000244RECIPIENTIDCODE/NAMEPD1-3LAJOHNSON,ACOPIESLTTRECLRECIPIENTIDCODE/NAMEPD1-3PDCOPIESLTTRENCLINTERNAL:AEOD/DOANRRBUCKLEY,BNRRRAMSEY,JRGN1FILE01EXTERNAL:LPDRNSICAEOD/DSPNRRHOU,SGNRCPDR02~VVVS7S~~NOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR13ENCL ROCHESTERGASANDELECTRICCORPORATIONi89EASTAVENuE.ROCHESTER,'N,Y.14649.0001June1,1990C%%"U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:AllenR.JohnsonProjectDirectorateI-3Washington,D.C.20555

Subject:

NRCBulletinNo.88-09:ThimbleTubeThinninginWestinghouseReactorsR.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Johnson,

PerourletterofJune6,1989,RochesterGasandElectricCorporationagreedtoprovideanappropriatetestingfrequencyforinspectionofincoreneutronmonitoringsystemthimbletubesasrequiredbyNRCBulletin88-09.RG6Ehasconductedthreetestsofthesubjectthimbletubes(February1988,May1989,andApril1990)usinganEddyCurrenttestingprocedureandanacceptancecriterionof65%through-wallwearasdescribedintheJune6letter.Allthimbletubeshavebeeninspectedandmeetthiscriteriawiththegreatestpositiveincreaseinthrough-wallwearmeasuredtobe10%betweenanytwoconsecutiveyears(i.e.,1988and1989,and1989and1990)andondifferentthimbletubes.Onlyonethimbletubecurrentlyindicatesthrough-wallweargreaterthan50%withthenextgreatestwearmeasuredtobelessthan25%.Thethimbletubeindicatingthegreatestwearwasrecentlyrepositionedinanefforttominimizeitsfuturewear.Asaresultofthesethreetests,RGGEhasdeterminedthatatestingfrequencyofonceeveryotherrefuelingoutage(i.e.,onceeverytwoyears)isappropriateforthimbletubeinspectionswhenthepreviousinspectionindicateslessthan45%through-wallintheweararea.Thimbletubeswithgreaterthan45%through-wall,butlessthan55%inthewearareawillbeinspectedannually,unlessthrough-wallwearhasnotchangedbetweentheprevioustwotests.Inthisinstance,thethimbletubewillbeinspectedeveryotherrefuelingoutage..Appropriatecorrectiveactionwillbeperformedifathimbletubeexceeds55%through-wallintheweararea.Theabovetestingfrequenciesweredeterminedas'follows.Applyingthemaximumwearrateof10%toasinglethimbletubeinitiallymeasuringlessthan45%through-wallwearwouldnotresultintheacceptancecriterionof65%beingexceededoveratwoyearperiod.Applyingthissamewearrate,toasinglethimbletubewiththrough-wallwearrangingbetween45%and55%foroneyearwillalsonotresultintheacceptancecriterionof65%beingexceeded.The65%acceptancecriteriaincludesnecessaryinstrumentationuncertaintyconsiderations.Pmgz'<QQI~QPQfel+'??QQ&QiF'DRADOCKQ'QQQ24+'~ywon.~~~~QF'DCi(p Thesetestingfrequenciesmaybechangedifthemaximumwearratebetweentestsindicateeitherexcessiveorsignificantlylessthrough-wallwear.TheNRCwillbenotifieduponanychangeintestingfrequency.RobertC.MecreDivisionManagerNuclearProductionSubscribedandsworntobeforemeonthis1stdayofJune,1990NotaryPublicSAMUELH.BAOWNENTARYPUBLlC,StatsolNowYetrationNo.49>7041QttsinMonoeCy.IWayneMyConstsssanspiesDeo.28,19MDFN120xc:AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector