ML17261B135

Provides Info & Assessment on Integrity of Connection of Containment Bldg to Foundation,Per 900808 Telcon.Util Believes That Existing Condition Not Safety Concern & No Reason Exists to Suspect Joint Will Not Perform Function

ML17261B135
Person / Time
Site:	Ginna
Issue date:	08/15/1990
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
NUDOCS 9008230155
Download: ML17261B135 (10)

Text

ACCELERATEDDISTRIBUTIONDH4REGULATORYINFORMATIONDISRIBUTIONSYSTEM(RIDS)/15NOTARIZED:NOant,Unit1,RochesterGCorp.

SUBJECT:

Providesinfo&assessmentrecon900808telconw/NRC.tainmentintegrity,perACCESSIONNBR:9008230155DOC.DATE:90/0FACIL:50-244RobertEmmetGinnaNuclearPAUTH.NAMEAUTHORAFFILIATIONMECREDY,R.C.RochesterGas6ElectricRECIP.NAMERECIPIENTAFFILIATIONJOHNSON,A.R.ProjectDirectorateI-DOCKETg05000244DISTRIBUTIONCODE:A001DCOPIESRECEIVED:TITLE:ORSubmittal:GeneralDistributionNOTES:LicenseExpdateinaccordancewithLTRENCLSIZE:10CFR2,2.109(9/19/72).DS05000244/RECIPIENTIDCODE/NAMEPD1-3LAJOHNSON,ACOPIESLTTRENCL1122PDRECIPIENTDCODE/NAME-3PDCOPIESLTTRENCL11DDINTERNAL:NRR/DET/ECMB9HNRR/DST8E2NRR/DST/SICB7ENUDOCS-ABSTRACTOGC/HDS2RES/DSIR/EIBEXTERNAL:LPDRNSICN/DOEA/OTSB11NRCPDR1,1111111NW/DST/SELB8D11NRR/DST/SRXB8E11OC/~10~REOl11111111101111DNOTETOALL"RIDS"RECIPIENTS:/ADDPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOUR:NAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR18,ENCL16 KIe-i.a>Lh tIIIIIIIIIIIIIIIAHOllllllt/g/j!IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIROCHESTERGASANDELECTRICCORPORATIONo89EASTAVENUE,ROCHESTERN.K14649-0001ROBERTCMECREOYVicePrerldentCinnaNuclearProductionTELEPHONEAREACODE7tB5462700August15,1990U.S.NuclearRegulatoryCommissionAttention:AllenR.JohnsonProjectDirectorateI-3DocumentControlDeskWashington,D.C.20555

Reference:

ContainmentIntegrityR.E.GinnaNuclearPowerPlantDocketNo.50-244August8,1990ConferenceCallRGGEwithUSNRC

DearMr.Johnson:

AsafollowuptotheAugust8,1990telephoneconferencecall,RGGEisprovidingthefollowinginformationandengineeringassessmentontheintegrityoftheconnectionoftheContainmentBuildingtoitsfoundation.SincetheJuly9,1990NRCRequestforAdditionalInfor-mation,RGGEhasreviewedallcurrentlyavailableoriginaldesigndocuments.Thereviewhasprovidedagoodunderstandingoftheoriginaldesignintentofallcomponentsofthejoint.ThefollowingisadescriptionofRGGE'sfindingsofthedesignbasisforeachofthecomponentsintheconnection(seeAttachments-1and2).Tendon/RockAnchorsThetendonconsistsof90-1/4"highstrengthsteelwiresconformingtoASTMA421-59T,TypeBA.Thetendonsystemprovidessufficientverticalprestressforcesotherearenonetmerid-ionalmembranetensileforcesintheconcreteshellunderappli-cationofdesignloadcombinations.pJfOvg>~(p~(<<l~p/0eooszsotsseoostsPDRADOCK05000244PPDC t~,r~g~t)~loi BellowsThebellowsare6-inchdiameter,stainlesssteelpipebellowscomplyingwithrequirementsofASAB31.1CodeforPres-surePiping.Theyprovidemovementcapabilityfortherigidtendonconduitatthehingedjointinordertoensureasealedtendonenclosurewhichretainsthegreasecorrosionprotectionaroundthetendonandalsosealsagainstcontaminantsgainingaccesstothetendons.Thebellowsalsoprovidesessentiallynoresistanceacrossthehingedjointtothemovements.Theinsidediameterofthebellowsisapproximately5.6inchesandthediameteroftnetendonbundleisapproximately3inches.With1.3inchesclearanceandmaximumpredictedhorizontalmovementatdesignloadsof0.2inch,marginisavailabletoprecludecon-tact.TheneoprenepadsusedinthedesignwerespecifiedtoconformtostandardoftheAmericanAssociationofStateHighwayOfficials.ThismaterialisusedextensivelyinU.S.andEuropeanbridgeconstruction.Thepurposeofthepadwastopreventmomentsfrombeingdevelopedinthecylinderwall.TensionBarsThetensionbarassembliesareapproximately20feetlongandconsistsofa13/8inchdiameterbarwithtwoanchorplates.ThebarconformstoASTMA322-64aandASTMA29-64.TheanchoragesplatesconformtoAISIC-1040andshalldevelop100%ofthebarsultimatestrength.Theassembliesareorientedradiallyatabout1foot1inchcenterstyingthebaseofthecylindricalwalltothematconcrete.Thebarsweredesignedtotransferhorizontalloadsfromthecylindricalcontainmentshellintothebasemat.Theytransferloadsfrominternalpressureandearthquake.Thedesignofthecontainmentwasbasedonanequivalentstaticseismicanalysis.Inconjunctionwithcontain-mentdesign,adynamicmodalanalysiswasperformed.Themodalanalysisshowedthatthehorizontalseismicloadswereapproxi-matelyhalfthoseusedinthedesign.Inthedesignofthesebars,theassumptionwasmadethatthetotalseismicloadistransferredbyonlyhalfofthetotalnumber,whichisaconservativeassumption.Further,nocreditwastakenforthefactthatthecylindercapsatwo-footthick matandthetruehorizontalloadtransferwouldbebyacombin-ationoftensileandcompressiveloads.Additionally,attheverticaljointwheretherodexistsfromthecylindricalsectionintothebaseslab,thebarsareencasedinthesamegreaseasthetendons.In1990,RG&Econductedtherequiredtendonsurveillancetesting,whichteststhetendon/rockanchorsystem.Theresultsoftheliftofftestshaveshownthattherequiredprestresscontinuestomeetalldesignrequirements.Aspartofthetendontestingprogram,asacrificialtendonwirewasextracted,examinedandtested.ThatwireextendedthefullheightoftheContainmentdowntothetendon/rockanchorcoupling.Thewireshowednoevidenceofcorrosionandtestedouttoitsspecifiedyieldandultimatestrengths.Thegreasewhichsurroundsthetendonwasalsoanalyzedandshowednoevidenceofwaterorunacceptablelevelsofchlorides,nitratesorsulfides.RG&Eperformedchemicalanalysisofthewaterinthevicin-ityofthejointandfoundittohaveapHof7.5,125PPMchloridesand120PPMsulfate,valueswellwithinacceptablelimits.RG&Eisperformingadetailedfiniteelementstressanalysisofcylindricalwalltobasematconnectiontoobtainabetterunderstandingoftheinherentconservatism'.Theworkhasbegunandwillbecompletedbymid-December,1990.RG&Eisintheprocessofmakingrepairsand/ormodifi-cationstothefoundationareatoassurethatnostandingground-waterwillbeincontactwiththisjoint.'numberofmaterialsarebeinginvestigated.Atthistime,adefinitivescheduleforcompletingthemodifications/repairisdependentontheseinves-tigations,butwearestrivingforacompletiondateofNovember30,1990.Thisperiodwillpermitadetailedinvestigationofpotentialmaterials'oensurethattheselectedapproachwillbeeffective.Inlightoftheabovediscussion,RG&Ebelievesthattheexistingconditionisnotasafetyconcernandthatthereisnoreasontosuspectthatthejointwillnotperform'itsdesignedfunctionforthefollowingreasons:oTheresultsofthetendonlift-offtestsconfirmthatthetendon/rockanchorsystemareperformingasdesigned.Italsoconfirmsthattheneoprenepadshavenotdeteriorat'ed,otherwisetendonforceswouldbelowerthanrequired.

0Theezaminationofthesacrificialwireshowednosignsofcorrosionpresent.0Nomoistureorunacceptablelevelsofchlorides,nitrates,orsulfideswerefoundinthetendongrease.0Thechemistryofthegroundwaterisbasicandcontainslowlevelsofchloridesandsulfates.0Thereisnoevidenceofgreaseleakingfromthejoint,implyingthatthebellowsarefunctioningasdesigned.0Thetension,barsystemandthecylinder/basemat.con-figurationprovidediverseloadtransferringmech-anisms.0Thematerialsofthecriticalcomponentsarenotsus-ceptibletostresscorrosioncracking.Basedonareviewofthedesigncalculations,ourbestengineeringjudgementisthatthesystemasawholeissubstan-tiallyconservative.Verytrulyyours;RobertC.MredLAS/154zc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorateI-3Washington,D.C.20555U.S.NuclearRegulatoryCommissionRegionI475AllendaleRoadKingofPrussia,PA19406GinnaSeniorResidentInspector CONTAlNMENTVESSELFORR.E.GINNAPO'LVERPLANTICSOOSISCSOIsoOSSIIIL5Illl~I~IlltlsCtst~5100I'Itisctslsllo~551CCL~1RIOICISC~1sca10siltIILLltsOO~~t~'$ttLLIstl14ONOCS1slits5tCt<Cltl105COSILISO10~IIIIltlIstsolI<<II51coso51~CCClosrICOIOCCI$504510sIIINIISIICCC~001Fig.l.Crosssectiono1containmentvessel.ATTACHMENT1 A90-'g"OIAB,B,R.V.WIRETENDONS--~(A9PCLWALLItTEHDONS--.52'-6"RADTOCLCONTAINMENTVESSEL9"~~"LINERpFl.EXIBLEFILLER(BOTHSIDES)6'gp'O.D.CQNOUIT'4"CEL'OTEXOREQUAL4)4SPIRALBARS-RIHGBEAM-NEOPRENEPAOBELLOWS-(SST)44pOTTOMAITTCCOATTITGGAOAA~4L)(g"DIAx2'-ll"SCH40PIPESLY(FILLWlGREASE)-CREASEDBARI~~DDCDI13"DIAx20'-0"TENSIONBARI123<"CENTERSIrTOPLINER((MAJEL233'-8"ROCKANCHORCOUPLIHGEHCLOSUREN4SPIRALBARS-gP+~<iPPy!~~~~ivp*1GROUTEDROCKAHCHOR--ATTACHMENT2

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