ML17258B008

June 1981 Tendon Surveillance Program.

ML17258B008
Person / Time
Site:	Ginna
Issue date:	04/27/1981
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17258B007	List: ML17258B006 ML17258B008
References
PROC-810630, NUDOCS 8105050455
Download: ML17258B008 (17)

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June1981TendonSurveillanceProgramRobertE.GinnaNuclearPowerStationApril27,1981 1JUNE1981SURVEILLANCEPROGRAM

1.0INTRODUCTION

TheJune1981tendonsurveillanceprogramispresentedindetail.Theprogramincludestheliftoffoffourteen(14)tendonsincludingthefour(4)tendonswithloadcells.Thedatacollectionsystemrequiredwillnotonlyconfirmtheliftoffdata,butitwillalsoobtaindataneededtocontinuetheinvestigationintothelargerthanpredictedtendonlosses.TheinspectionandselectionprocessdiscussedintheProposedRevision3toUSNRCRegulatoryGuide1.35arefollowed.Themeasuredforceforeachtendonwillbeevaluatedwithrespecttoitspredictedlowerlimitforcediscussedinthisguide.ThesepredictedlowerlimitforcesareobtainedusingthelosscalculationmethodologydescribedintheProposedUSNRCRegulatoryGuide1.35Positionl.2.0OBJECTIVES,TheJune,1981surveillanceprogramisrequiredtoverifythatthetendonforcesarewithinthetechnicalspecificationsandtoprovidefurtherinformationastowhytendonshaveexperiencedprestresslossesinexcessoftheirpredictedvalues.Thissurveillanceprogramasoutlinedhereinhasfourobjectives:1~Tomeasurelift-offforcesinselectedtendons.2.Tocomparelift-offforceswiththosepredicted,usingeithertheexistingrelaxationdataand/orretensionedwiredatafromthetestingcurrentlyunderwayatLehighUniversity.3.Tocomparethetwoforcemeasuringsystems:a.Straingagedstressingrod.

1W b.Pressuregaugeandeffectiveramarea.4.Totestthe6%overstresseffect.ThefollowingsurveillanceprogramisintendedforuseonlyinJune'1981.Itisexpectedthatthedetaildatagatheringproposedwillnotbenecessaryonsubsequentsurveillances.3.0TENDONSELECTION3.1Thetendonselectionprocesswill:1.Verifythattendonforcelosseshavestabilized..2.Surveyenoughtendonstoextendpresentdatabase.3.Includeallfourtendonswithloadcells.4.Includetendonsretensionedat1000hoursafterinitialstressing.5.Includetendonsfromeachtendonmarkcategory.3.2Table1containsthecompletelistofselectedtendons.3~3Toverifythatthetendonforcelosshasstabilized,-tendons62and76areselectedbecausetheyexperiencedlargelossesduringthefirsteleven(ll)years.Tendon51isselectedasanaveragelosstendonand155asaminimallosstendon.3.4Toextendthedatabase,tendons17and84areselectedbecausetheyeachhavefour(4)recordeddatapoints.3.5Loadcellsarepresentundertendons13,53,93,and133,therefore,theseareselectedforsurveillance.Tendons133and13willbeusedtoevaluatethe6/overstresseffect.

kI' 3.6Toincludetendonsretensionedat1000hours,fourareselected;twosurveyedpreviously(36and111)andtwonotsurveyed(33and116).4.0TESTPROCEDUREFORLIFT-OFF4.1InitialConditions1.Plantmaybeinanyphaseofoperation.2.Pressuregaugehasbeencalibrated.3.Hydraulicramareahasbeencalibrated.4.Hydraulicpumpandramarefunctionalandreadyforoperation.5.Loadcellsandstressingrodhavebeencalibrated.6.Alltendonstobestressedhavebeeninspectedforbrokenwiresandcorrosion.7.Containmentstructurehasbeeninspectedforcracks,spalling,etc.4.2Precautions1.ObserveallRGBsafetyrulesandregulations.2.Donotexceed6560psigaugepressureforjackandtendons.3.Wheneverhydraulicpumpisoperating,thereservoirventvalvemustbeopen.4.Donotextendrammorethan8inches.

4.3GeneralInstructions1.Fillinline1-4onthedatasheet(SeeAppendixI)andrecordcommentsfromthevisualinspectiononline5.2.Moveassembledhydraulicjacktopositionforcouplingtotheanchorheadandplacethepumpinaconvenientlocationforoperation.a.Carefullythreadstressingadaptorontotendonanchorhead.Note:Leaveaminimumofonethreadandmaximumofthreethreadsontendonanchorexposedbelowtheloweredgeofthestressingadaptor.b.Placejackassembly,ontendonbaseplate.c.Centerjackchaircarefullyovertendonheadandthreadstressingrodintostressingadaptor.d.Centercompressionshimsandtightenjackrodnutattop(ram)endofjackbeingcarefulnottodamagestraingagedareaandtheelectricalconnectorontopofthe,jackrod.3.Maketheappropriatestraingageconnectionsandcheckformalfunctions.4.Beforeattachinghosestojackforthefirsttendon,checkpumpandhosesbyperformingthefollowing:a.Setvalvestopumpposition.b.Startpumpatthesametimedepresstheballvalve.

c.Pumpslowlytofillhosewithoiluntilitcomesoutofthehosefreeofbubbles.d.Releaseballvalveandstartpumpingagain.Continuepumping;hosewillbecomestiff;gaugepressurewillriserapidlyandthenholdconstant.5.Reducepressureandconnecthosestojack.6.Recordallinitialreadingsintheappropriatecolumnsonthedatasheet.7.Startpumpandincreasepressureto2,000psi.a.Recordstressingrodreadingincolumn3aondatasheet.b.Recordload'ellreadingincolumn4aonthedatasheetiftendonhasloadcell.c.Recordrampositionininchesincolumn5ondatasheet.d.Calculateandrecordforcevaluesforthestressingrod,pressuregaugeandloadcell.8.Increasepressureupto4,000psiandhold.a.Inspectforleakageofhydraulicfluidandnoteifleakageisexcessive.b.Recordstressingrodandloadcell(iftendonhasloadcell)-readingsintheappropriatecolumnsonthedatasheet.c.Calculateandrecordforceforthestressingrod,pressuregaugeandloadcell.

9.Increasepressureuntila0.035(1/32)inchthickfeelershimcanbeinsertedintotheshimstackattwoequallyspacedpositionsaroundtheshimstack.10.Reducerampressure1000psioruntilthefeelershimscannotberemoved.Increasepressureuntilbothfeelershimscanberemoved.Noteinthecommentsectionifthereisalargedifferenceintheloadatwhicheachfeelershimcanberemoved.Thisisdefinedasliftoff.a.Recordthepressuregaugereadingonthedatasheetincolumn2a.b.Recordthestressingrodreadingonthedatasheetincolumn3a.c.Recordtheloadcellreadingforloadcelltendonsincolumn4a.d.Recordtherampositionincolumn5ofthedatasheet.e.Calculateandrecordforcevalues.11.Stresstendons13and133anadditional6%overrecordedliftoffpressure.a.Recordcomputed6/overstresspressureondatasheetincolumn2a.b.Increasepressuretocomputed6/overstressingpressureandrecordstressingrodreading,loadcellreadingandrampositiononthedatasheet.c.Placetwo.035(1/32)inchthickfeelershimsintheshimpackandreducerampressuretoapproximately2900psi.

l' d.Slowlyincreasepressureuntilthefeelershimscanbewithdrawnfromshimstack.Thisisdefinedasliftoff.Recordloadcell,pressuregauge,straingageandrampositionondatasheet.e.Calculateandrecordforcevaluesondatasheet.12..Decreasepressuretoapproximately4,000psi.a.Recordstressingrodreading,loadcellandrampositiononthedatasheet.b.Calculateandrecordforcevaluesondatasheet.13.Decreasepressuretoapproximately2,000psi.a.Recordstressingrodreading,load'cellreadingandrampositiononthedatasheet.b.Calculateandrecordforcevaluesonthedatasheet.14.Decreasepressureuntilallloadisremovedfromjackrod.a.Recordstressingrodreading,loadcellreadingandrampositiononthedatasheet.15.Removejackassemblyfromtendon.a.Disconnectstraingageequipment.b.Unthreadstressingrodfromcoupler.c.Removejackchairandstressingrodassembly.d.Removeadapterfromtendonhead.

16.Recordanycommentsconcerningliftoffonthedatasheet.17.Movetonexttendon.5.0DATACOLLECTIONPROCEDURES5.1TestData-Recordalldataasrequiredin4.0,TestProcedureforLiftoff5.2Datasheet-TheproposeddatasheetispresentedinAppendixI.5.3Stripchartrecordingsofforcefromloadcelltendonswillbeginwhenthejackassemblyismovedfromthattendonandcontinuefor500hours.6.0TENDONSURVEILLANCESEQUENCEThescheduleispresentedinTable2.7.0ACCEPTANCECRITERIAThemeasuredliftoff.forceswillbeevaluatedinaccordancewiththepresent"GinnaTechnicalSpecifications."

Table1TENDONSELECTIONTendonNumberTendonMarkComments1317'3336515362768493111116133155ACGSHTAAABAAA2ERAALoadcellMaximumrecordeddataRetensionedat1000hoursRetensionedat1000hoursAveragellyearlossIoadcellLargellyearlossLarge11yearlossMaximumrecordeddataIoad'cellRetensionedat1000hoursRetensionedat1000hoursLoadcellSmall11yearloss 10Table2TENDONSURVEILLANCESE(}UENCESequenceNumberTendonNumberSecialInstructions910ll12131413173336515362768493111116133155I,oadcelland6/overstressingLoadcellLoadcellIoadcelland6/overstressing.

AppendixIDataSheet-June1981TendonSurveillance 12DATASHEET1-JUNE,1981TENDONSURVEILLANCERG&EGINNANUCLEARPOWERSTATIONROCHESTERGASANDELECTRICCORPORATION1)Date2)HydraulicJackNo.3)HydraulicPumpNo.4)LoadCellFactor--TendonNo.RamArea"=PressureGaugeNo.ShimStackThicknessStressingRodGageFactor~'~5)TendonInspectionComments1Condition2PressureGaue3StressinRod4I.oadCell5RamPosition6CommentsInitialIncreasingIncreadingLiftoffa(bPressureForce"(si)(lbs)20004000aStrain(min/in)bForce---(lbs)bStrainForce"""(min/in)(lbs)inchesLiftoff+6g(Tendons13&133)LiftoffDecreasingDecreasingDecreasin400020000 13DATASHEET1(Cont'd)Notes:(-)Ramareatobeusedtocalculateramforceincolumn2b:Force=RamAreaxPressureLoadCellFactortobeusedtocalculateforceincolumn4b:Force=LoadCellFactorx(Strain'Reading-InitialStrainReading)StressingRodGageFactortobeusedtocalculateforceinrodincolumn3b:Force=StressingRodGageFactorx(Strain-InitialStrainReading)