ML17249A907

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Submits Addl Info Re Tendon Insp & lift-off Verification,In Response to NRC 800326 Ltr.Also Forwards Revised Pages & Tables for GAI-2074, Evaluation of Prestressed Tendon Forces.
ML17249A907
Person / Time
Site: Ginna Constellation icon.png
Issue date: 05/13/1980
From: WHITE L D
ROCHESTER GAS & ELECTRIC CORP.
To: ZIEMANN D L
Office of Nuclear Reactor Regulation
Shared Package
ML17249A908 List:
References
NUDOCS 8005210500
Download: ML17249A907 (38)


Text

REGULATORv NFORMATION DISTRIBUTION S'"TEM(RIDS)~0/y'CCESSION NBR:8005210500 DOC,DATE:

80'/05/13 NOTARIZED:

NODOCKETFACIL:50244RobertEmmetGinnaNuclearPlantiUnit1PRochester G05000244AUTH~NAME),AUTHORAFFILIATION HHITEPL,D.

')B'altimore Gas8ElectricCo.RECIP~NAME'RECIPIENT AFFILIATION OfficeofNuclearReactorRegulation ZIEMANNE0~L~Procedures 8TestReviewBranchSUBJECT;Submitsaddiinforetendoninsp8lift-offverificationgin responsetoNRC800326ltr.Alsoforwardsrevisedpages8tablesforGAI2074'Evaluation ofPrestressed TendonForces,"OISTRISUTION CODE:ASSISCOPIESRECEIVED:LTR ENCLISIZE:WZ4TITLE:GeneralDist~ibution forafterIssuanceofOperating'Lic NOTES:g+,'~Cl.lSOA'~

E',~Dgal~+IYJ RECIPIENT COPIESRECIPIENT IDCODE/NAME LTTRENCLIDCODE/NAME ACTION;05BC6R8W~77COPIESLTTRENCLINTERNAL:

012IEE17ENGRBR19PLANTSYSBR21EFLTTRTSYSOELDEXTERNAL:

03LPDR23ACRS112211111101161602NRCPDR15COREPERFBR18REACSFTYBR20EEBEPB~DORSTSGROUPLEADR00NSIC1111111111111oTOTALNUMBEROFCOPIESREQUIRED~LTTR~ENCL r0-P~nfr~llr'lIIf1lI,PfI,'ir,g~,rII4~rlI'1I,lfe"~~>rrialrfffll(ffQ(~4Nrt8~IIf$>g~)

fp1pwzuzmIIIII/Ill/III/IIIII///

//////////////I//////

ROCHESTER GASANDELECTRICCORPORATION gl~0IsaOq,'1AECI~.~svEASTAVENuE,ROCHESTER, N.V.~iidrLEONO.WHITE,JR.VICEPRESIDENT TELEPHONE AREACODE710546-2700May13,1980DirectorofNuclearRegulation Attention:

Mr.DennisL.Ziemann,ChiefOperating ReactorsBranch52U.S.NuclearRegulatory Commission Washington, D.C.20555

Subject:

TendonInspection andLift-OffVerification GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Ziemann:

InresponsetoyourletterdatedMarch26,1980,wehavepreparedthefollowing information.

Also,revisedsheetsdatedApril11,1980tobeincorporated intothereport"Evaluation ofPrestressed TendonForces-RobertE.GinnaNuclearPowerStation"areincludedasAttachment 1tothisletter.ResonsetouestionNo.1:Regarding thestatement madeinthefirstsentence, shrinkage isnot,considered tobeanimportant.

factorcontributing tolossofprestress.

AsseenfromTable2ofthereport,shrinkage accountsforonly2.8kips(2.1%)ofthetotal40yr.lossof130.5kips.Shrinkage testswereconducted onvarioustrialconcretemixdesigns.Thetestswereinaccordance withASTMC-494,"Chemical Admixtures forConcrete."

Theresultswereusedforcomparing theshrinkage ofvariousmixdesigns.Thmshrinkage values,whichwereintheneighborhood of250x10in./in.at28days,werebasedon3in.squarebyll~in.longspecimens whichwerestoredinairat73'Fand50%relativehumidity.

Theshrinkage strainswhichthesespecimens experienced arenotapplicable tothoseoccurring inthe3ft.6in.massivecontainment walls.Thesewallshaveavolume-to-exposed surfaceratioof42in.,versus0.7in.forthetestspecimens.

Theinformation giveninref-erences(4)and(6)ofthereportindicates that100x10in./in.isaconservatively large40yr.shrinkage strainforV/S=42in.

r'~tf(

ROCHESTER GASANDELECTCCORP.DATEMay13,1980ToMr.DennisL.ZiemannSHEETNO.2Projectdocuments identifytheconcretemizdesignusedforthecontainment wallas:Cement(TypeII)FineAggregate CoarseAggregate (N.Y.51)(N.Y.82)WaterAdmixtures 658lbs.(7sacks)1310lbs.1290lbs.440lbs.35.7gals.(298lbs.)DarezPlastiment 4.5oz.peryard21oz.peryardThewater-cement ratioofthemizis0.45(byweight).NeithertheProposedRegulatory Guide1.35.1noritsreferenced

document, Reference (4),explicitly relatesshrinkage towater-cement.

ratio.Theshrinkage testspecimens ofReference (4)contained 5.44sacksofTypeIIIcementpercubicyard,andsomesealedspecimens wereincluded.

AlthoughReference (4)doesnotstatethewatercontentforthespecimens, itwouldbeexpectedthatthisconcretehadawater-cement ratioequaltoorgreaterthanthatoftheGinnacontainment concretewhichuseda0.45water-cement ratio.Asstatedinthereport,theMeanDailyRelativeHumidityfortheGinnasiteisinthe70%to80%range.Thishumdityiswithinthe40%to8(%rangeofProposedRegulatory Guide1.35.1forwhich100x10in./in.isspecified.

Therefore, itisconcluded thattheshrinkage valueofReference (4)asappliedtotheGinnacontainment concreteisconservative.

ResonsetouestionNo.2:Twobasictypesofshrinkage occurinconcrete:

dryingshrinkage andautogeneous shrinkage.

Duetothemassivenatureofthe42"thickcontainment wall,mostoftheverticalshrinkage ofthewallthatissignificant enoughtocausealossofprestress force,occursoveritsinteriorandisduetoautogeneous shrinkage.

Itisgenerally acceptedthatautogeneous shrinkage isassumedtostartassoonasthehydration processstarts.Thus,tosimulatethiscondition, "onehourafterconcreteplacement" wasusedtostarttheshrinkage straincurveinFigure3ofthereport.AsshowninFigure2ofthereport,theconcreteplacement inthecontainment wallstartedinApril1967andwascompleted inJune1968.Useoftheaverageplacement datefortheshrinkage lII ROCHESTER OASANDELECTCORP.DATEMay13,1980ToMr.DennisZ.ZiemannSHEETNO.3straincalculation assumesthatthelowerhalfofthewallwasconstructed priortothisaveragedateandtheupperhalfwasconstructed afterthisaveragedate.Thus,atanypointintime,concreteinthelowerhalfofthewallwouldexperience shrinkage strainsgreaterthanthatpredicted basedontheaveragedate,andconcreteintheupperhalfwouldexperience shrinkage strainslessthanthatpredicted basedontheaveragedate.Thetotalshrinkage shortening ofthewallisthesumoftheshrinkage strainsforeachconcretelifttimestheliftheight;however,theshrinkage strainisdifferent foreachlift.Useofanaverageplacement datefortheconcretetoestablish anaverageshrinkage foralltheliftsisareasonable andsufficiently accurateapproach.

ResonsetouestionNo.3:ThecreepcurveofReference (6)ofthereportisincludedasAttachment 2.Itwasusedtoestablish thespecificcreepvaluesdefinedinthereport.Independent creeptests,werenotrec{uired forGinnaandwere,therefore, notconducted.

Theconcretemixdesignusedforthecontainment wallisgivenintheresponsetoQuestion1.FortheGinnamix,thevolumeconcentration ofcementpasteintheconcreteis0.34,andthewater-cement ratiobyweightis0.45.ForReference (6)thesevalueswere0.30and0.50,respectively.

Becauseofthesimilarity ofthetwomixes,thespecificcreepdataofReference (6)isconsidered applicable totheGinnaconcrete.

ResonsetouestionNo.4:ThedesignbasisfortheGinnacontainment wasACI318-63.Itdoesnotcontainarequirement toproviderelaxation testsforthetendonwires.Datausedwasprovidedbythetendonsupplierbasedontypicalwiresproducedatthattime.Asstatedinthereport,theprestressing wirewasspecified tohaveanominal40-yearstressrelaxation of12%.Figure3Aofthereport,isbasedonstress-relaxation curvesfromArmcoSteelCorporation (SeeAttachment 3),thesupplierofthewireforGinna.ThecurvesforSpecimens 1and2wereprovidedbyArmcoasbeingrepresentative oftherelaxation gradeofwireprovidedforGinna,butthespecimens werenot.takenfromGinnaproduction wire.ThecurveinFigure3Aofthereportwasconstructed bymultiplying therelaxation curveforSpecimen2bythefactor(12/11.5).

NotethatthecurveforSpecimen2includesdatafrom1000-hour relaxation tests.

I' ROCHESTER GASANDELECTCCORP.DATEMay13,1980ToMr.DennisL.ZiemannSHEETNO.ResonsetouestionNo.5:Intheoriginaldesign,arequiredminimumaveragetendonforceof636kipswascalculated.

Thisforceresultedfromthecontrolling loadcombination:

where0.95D+F+1.5P+TaD=DeadloadF=Verticalprestress P=Accidentpressureof60psigT=Accidenttemperature, including operating temperature aResonsetouestionNo.6:Theprinciple causeofthelossoftendonprestress istherelaxation ofthesteel.Theresultsofthetenyearretestin-dicatethat,whatappearedtobeanincreased rateoflosswasinfactdiscrepancies intheacousticlift-offreadingsforthe8yearsurveillance.

Duringthetenyearretest.,avisualobserva-tionoftheeffectofcompletedetensioning ontheconnection betweentherockanchorandthewalltendonwasmade.Noobserv-ablemovementoccurred(seepageI-3ofAddendum1ofthereport).Theeffectofdetensioning onetendon,ofatotalof160,ontheelastomeric padwasnot.addressed duringthetenyearretestsincethechangewouldhavebeentoosmalltoprovidereliabledata.ResonsetouestionNo.7:Theuseof1/32inchshimsratherthantheacoustical methodtodetermine lift-offwasrecommended byInryco,Inc.,whosuppliedandstressedthetendonsandconducted the10yearretestofthetendons.Alackofreproducibility oflift-offreadingsonsomeprojects, asdemonstrated bythedifferences betweenthe8and10yearGinnatests,promptedachangetothisprocedure.

NotefromTableI-1ofthereport,columns(1)and(2),thatthereisnotasignificant difference inthelift-offpressures usingthetwomethods.Theacousticmethodofdetermining lift-offishighlydependent.

ontheindividual conducting thetestwhiletheabilitytoremovea1/32inchshimfromtheshimstackcanclearlybedemonstrated.

ResonsetouestionNo.8:Aninspection oftheconcretearoundthetendonanchorages hasnotbeenrequiredduringtendonsurveillance.

Hence,docu-mentation, visualinspection orphotographs arenotavailable forpastsurveillances.

Theconcretesurrounding therockanchorisinaccessible andhasnotbeeninspected.

~'ROCHESTER GASANDELECTCORP.DATEMay.13.,1980ToMr.DennisF.ZiemannSHEETNO.5Question9isinseveralpartswhichwillberesponded toasindividual questions.

ResonsetouestionNo.9a:Pages5.1.2-20, 5.1.2-20a, and5.1.2-21oftheGinnaFSAR(SeeAttachment, 2,part6ofthereport)givethedesignbasesfortherockanchorsandcontainthebasicreferences usedtojustifythecriteria.

ResonsetouestionNo.9b:Page5.1.2-23oftheGinnaFSAR(SeeAttachment 2,part6ofthereport)indicates thecapacities andsafetyfactorsfortheoriginaldesign.Reson'setouestionNo.9c:RGBrecordsindicatethatthetypicalrockanchorlengthis33'-6".Individual recordsforeachtendonareavailable ifdesired.ResonsetouestionNo.9d:Pages5.6.1-4through5.6.1-5oftheGinnaFSAR(SeeAttach-ment4)describethescaleddowntestsperformed todeveloprockanchorcriteria.

ResonsetouestionNo.9e:Page5.1.2-24oftheGinnaFSAR(SeeAttachment 2,part6ofthereport)describes thetechnigue usedtoinstallthetendon/rock anchorcouplingdevice.Attachment 5isanassemblydrawingofthetendontorockcoupling, andthemanufacturer's drawingsoftheindividual parts.ResonsetouestionNo.9f:Thedesignassumption toutilizetheweightoftherock(Seeresponsetoquestion9a)asthemaximumforcefortheanchortakesintoaccountalladverseeffectsofgroupactionsincethecapacityoftheanchorwasbasedon.8UTSor847kipswhichisalargerforce.Sincetherockanchorswerestressedto.8UTSduringinitialinstallation, newloadstobeappliedduringthere-tensioning programshouldhavenoadverseeffects.

eIWC ROCHESTER GASANDELECTCORP.DATEMay13,1980ToMr.DennisL.ZiemannSHEETNO.6Ifthereareanyfurtherquestions regarding thisinformation, pleasecontact"us.

Verytrulyyours,~MpLDW:rbAttachments zc:Mr.BoyceH.Grier,DirectorOfficeofInspection andEnforcement RegionIU.S.NuclearRegulatory Commission w/attachments t

Attachment 1

Attachment 2

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~~1'IW TypeIIcement,modifiedforlowheatofhydration, isusedtominimizeshrinkage.

"Grab"samplesaretakenperiodically atthebatchplant,upondeliveryofcement.EachsampleistestedbytheTestingLaboratory forconformance to'ASTMC150,andtheresultsarealsocomparedwiththecertificate supplywitheachdeliveryofcement.Elastometer BearinPadsTestsareperformed onelastomer specimens toensurecompliance withrequirements for(1)originalphysicalproperties including tearresistance,

hardness, tensilestrengthandultimateelongation, (2)changeinphysicalproperties duetooveraging, (3)extremetemperature characteristics, (4)ozonecrackingresistance, (5)oilswelland(6)shearmodulus.Inaddition, twofullsize'pads aretested,oneforcreepandoneforultimateload.SpecimenNo.1isinitially placedunderessentially aconstantcompressive loadof1000psi(thedesignpressure) forfourdaystomeasurecreep.Thispadisthenloadedupto2000kips(5.3timesdesignload)whenthetestwasterminated withoutfailure.SpecimenNo.2wassimilarly loadedupto2000kipswithoutfailure.Thereboundofthepadsafterthe2000kiploadwasremovedisessentially complete.

AsummaryofthetestresultsisshowninFigures5.6.13and5.6.1-4.RockAnchorTestsThreescaleddowntestrockanchorswereinstalled todemonstrate firstthehold-down capacityoftherockandsecondthecapacityofthebondbetweenrockandgrout.5.6.1-44/69 21Jk~'

Twotestsweremadeonrockanchor"A"whichwasinstalled atthecenteroftheproposedcontainment vessel.Thefirsttest,calledtestA-1wastodetermine rockhold-down capacity.

Theset-upfortestA-1isillustrated inFigure5.6.1-5.Thebeamsupportpierswerelocatedbeyondtheassumedinfluence circleofrockhavingadiameterof23feet6inches.Anindependent framewaserectedtoobtaindeflection measurements on.theconcretepierat.theanchor.Thisplacedallsupportsforliftingaswellasmeasuring devicesoutsidetheinfluence circleofrock.Dialgaugeswereusedtomeasurethemovementoftheconcretepierandtheanchorhead.Thetestloadwasappliedwitha150tonjackmountedonthebeamsspanningthetestanchor.Measurements ofthejackingforceweremadewithadynamometer, calibrated immediately beforethetest.Thesecondtestonrockanchor"A"(TestA-2)andthetestsonrockanchors"8"and"C",alsoinstalled nearthecenteroftheproposedcontainment vessel,weremadetodemonstrate bondcapacity.

Theset-upfortestA-2andforrockanchors"8"and"C"wasanarrangement wherebythejackwassupported directlybytheconcretepieradjacenttothetestanchor.5.6.1-4a4/69 k~4F'I1IR1 Rockanchor"A"consistsoftwenty-eight 1/4inchdiameterwiresgroutedforalengthof4feet5-1/2inchesina3-1/2inchdiameterhole.Alltestrockanchorswereoversized sothatthetestloadof100kipswoulddeveloponlyabout30%oftheultimatecapacityoftendonwireswhiledeveloping abondstressof170psiwhichisthedesignstressforthecontainment rockanchors.Thispermitted testingbondstresseswellinexcessofdesign(170psi)withoutexceeding ultimatewirestresses.

Thetestprocedure fortestA-1wasasfollows:Theanchorwasloadedin20,000poundincrements to100,000pounds.Theloadwasmaintained ateachincrement for15minutespriortotakingmeasurements forelongation ofthetendonandclevations oftheconcretepedestalandadjacentrocksurface.Becausetheanchorheadappearedfromvisualobservation tonothaveliftedoffatthe100,000poundload,theloadwasincreased to110,000poundsatwhichpointliftoffwasapparent.

Subsequent reviewofmeasurements onthemovementoftheanchorheadindicatethatactualliftoffoccurredbetween80,000poundsand100,000poundsaswouldbeexpected.

IntestA-2,"B"and"C",tendonwasjackedfromtheconcretepierimmediately adjacenttothetendon.Table5.6.1-1listsmeasurements takenduringtestA-1.figures5.6.1-6,.5.6.1-7and5.6.1-8showplotsofloadvs.elongation deflection foralltests.Theapplication ofatestloadof110kipstorockanchor"A"(asindicated bytheresultsoftestA-1shownonFigure5.6.1-6)isequivalent to137.5%ofthecalculated hold-down capacityassumption usedinthedesignisvalid.Theplotofloadvs.elongation deflection forrockanchor"A"testsA-2(seeFigure5.6.1-6)and"B"and"C"(seeFigures5.6.1-7and5.6.1-8)indicateafactorofsafetyagainstslippagebythegroutandrockofatleast2.0(200kiploadvs.100kipdesignload)forrockanchor"B",.Ifslippageoccurredwithinthegroutthefactorofsafetyagainstfailureisevengreater.Theplotofloadvs.elongation forrockanchor"A"showsanapparentdis-continuity whichisindicated byadashedlineonFigure5.6.1-6.Thisrepresents settlement oftheconcretepieradjacenttotherockanchorwhentheloadwastransferred fromtheliftingframeusedintestA-1tothelocknutwhichbearsontheconcretepier.5.6.1-5 41lPW Attachment 5

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