ML17207A498

Interim Deficiency Rept Re Damage to Reactor Auxiliary & Shield Bldgs from 790903 Derrick Collapse During Hurricane David.Forwards Six Drawings Detailing Storm Damage.Available in Central Files

ML17207A498
Person / Time
Site:	Saint Lucie
Issue date:	10/04/1979
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17207A497	List: ML17207A496 ML17207A498
References
NUDOCS 7910250378
Download: ML17207A498 (15)

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InterimConstructionDeficiencReortDamaeResultinFromDerrickFailureDurinHurricaneDavidName,ofStation:Owner:Architect/Engineer:DateofDeficiency:InterimReportFiled:St.LuciePlant-Unit52FloridaPower6LightCompany.EbascoServices,Incorporated,September3,1979October4,1979

I.SUMMATEOnMondaymorning,September3,1979,atapproximately10:45a.m.,theChicagoBridgeaIronguyedderrickbuckled,twisted,andcollapsedduringHurricaneDavid.Thelowerportionofthederrick(belowelevation+192feet)didnotcollapseandwasleaningataslightanglefromthe,vertical,remainingbracedtothecontainmentshieldwallbyvirtueofthehorizontalstrutbraces.TheupperportionofthederrickbecamedismemberedandfourmajorsectionscametorestinorontheReactorAuxiliaryBuilding.Aportionoftheboomremainedsuspendedbyguywiresfromthetopofthecontainmentshieldwall.Theguywiresperformedtheirintendedfunctionanddidnotfail.Pertherequirementsof10CFR50.55(e),theeventisreportablebecausethederrickfailurecausedsignificantdamagetosafetyrelatedstructuresand,weretheytohaveremaineduncorrected,couldadverselyaffectthesafetyofoperationsoftheplant,anddoesrequireextensiveevaluationandrepair.NotificationoftheincidentwastelephonedintotheNRCInspectionandEnforcementOfficeonSeptember4,1979(approximatelyll:45a.m.)byMr.N.Weems,FloridaPoweraLightCompany'sAssistantManager,QAConstruction.Afternumerousonsiteinspections,engineeringisintheprocessofdevelopinganddispositioningcorrectiveactionsforthedamagedareas.Subsequenttoaforementionedinspections,onsiteconfixmatorydestructiveandnon-destructivetestingwillbeimplementedandanyadditionalcorrectiveactionwillbeissuedbyengineeringifrequired.Aninterimreportisbeingsubmittedwhileinvestigationofthedamagedareasisstillongoingandrepairworkisproceeding.II~DESCRIPTIONTheconcreteShieldBuildingandtheReactorAuxiliaryBuildingwereattherfollowingstagesofconstructionwhenthehurricanepassedthejobsite:TheconcreteShieldBuildingcylinderhadbeencompletedtoelevation+191.42feetandtheReactorAuxiliaryBuilding,beingconstructedinastaggeredmanner,hadwallsandcolumnscompletedtotheundersideoffloorslabsatelevations+43feet,+62feetand+82feet.

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'II.DESCRIPTION(continued)ComletedActionstoIdentifDamaeAstormdamageteamwasassembledtodetermineanddocumenttheextentofdamageresultingfromthederrickfailure.Theteamconsistedofaconstructioncivilengineerandtwoassistantcivilengineers.Inconjunction,theArchitect/Engineerhas'isitedthejobsite,bothbeforeandafterderrickremovalandcleanup,toobservethedamage,andtoconfirmthetaskforcefindings.Areascompletelyunaffectedbythederrickfailurehavebeenreleasedforcontinuedplannedconstruction.Investigationsareongoingtodetermineifandwheredestructiveandnon-destructivetestingshouldbeperformedbeforereleasingareasadjacenttoareasdamaged.Thedamagetothecontainmentshieldwallwaslimitedtobentandsheareddowelsprojectingfromthetopofthecylinderwallandasmallsurfacegaugeontheexteriorwall.Themappingofthisdamagedareahasnotyetbeencompleted.Thedamage'ithintheReactorAuxiliaryBuildingwasextensiveandconsistedofpenetrationoffloorslabs,shatteredfloorbeam;spalledconcrete,andbentandsheareddowelsforcolumnsandwalls.Thereisapossibilityofsomecrackingofsomefloorbeamsandgirdersandoneexteriorwallsection.Thelocationofderrickandboom'ectionrestingpositions,anddetailsofobserveddamagetotheReactorAuxiliaryBuildingispresentedontheenclosedsketches,SK-2998-FG75.01to75.06.Inadditiontothenoted.damageontheattachedsketches,crackswereobservedonthesurfaceofafewelevation+43feetfloorbeams.Thesecrackswerechippedbacktodeterminedepthandwereobservedtobeonlysurfaceshrinkagecracks.hTInadditionto.the.abovestructuraldamageintheReactorAuxiliaryBuildingIII~Ithefollowingisalistingofdamagedequipmentandsupports:1-Conduitonelevation+43feet2-Cabletrayrestraintonelevations+43feetand+62'eet3-4.16KVSwitchgear2A3-1,2,3,4,5,6,7,8-Y~~='~","I4-StationServiceTransformer2A2'g'CPh,'.,h*5-480VSwitchgear6-Pressurizerheater'buses2A3and2B3T~',4'CIh,T~ITth'h'

~q~~II.DESCRIPTION(continued)PlannedActionstoFurtherIdentifDamaeArchitect/EngineerhasdirectedConstructiontoproceedwithtwotestingprogramstoconfirmtheextentofdamagewithintheReactorAuxiliaryBuilding.Thefirstprogramrequirestestingofreinforcingsteelsamplesremovedfromthedamagedfloorbeamsandslabsatelevation+62feet.Testresultswillindicateifthereinforcingwhichextendsintothesurroundingsoundconcretehadbeenoverstressedduringmissileimpact.Thesecondprogramrequiresnon-destructivetestingofconcretemembers,1)adjacenttodamagedfloorslabareasatelevations+43feetand+62feet,includingallthebeamsatelevation+43feetwhichwereobservedtohaveonlysurfacecracks,and2)inanexteriorwallalongthenorthsideofthebuildingwhichhadonlyfivedayconcretestrengthwhenasectionofthyderrickhitthetopofthewall.ThepulseechomethodwasselectedandwillbeperformedbyMuenowandAssociatesofCharlotte,NorthCarolina.TheattachedFigures1and2showtheconcretememberstobeinvestigated.Inaddition,thedamagedareasonthecontainmentshieldwallwillbemappedandevaluatedpriortoanyrepairworkbeinginitiated.III.CORRECTIVEACTIONSComletedCorrectiveActionsFloridaPower6LightCompany'sQualityControlDepartmenthastheresponsibilitytopreparenonconformancereports(NCR's)wheredamagehasoccurredtocompleteconstructionactivities(i.e.,afterconcreteplacement)orisalistofdispositionedNCR'ssummarizingcategoriesofItypesofdamageandcorrectiveactiontobetaken.equipment.Table1structuralmembers,Table2isalistofcurrentlydispositionedNCR'ssummarizingtheequipmentdamageandcorrectiveactiontobetaken,-'additionalNCR'swillbeissuedasrequired.glrThreeadditionalNCR's(834C,842Cand851C)havebeenissuedforthedamagedconcreteandreinforcingwithinslabsandbeamsatelevations+43feet.

'~~III.CORRECTIVEACTIONS(continued)PlannedCorrectiveActions'continued)TheseNCR'swillnotbedispositioneduntilaftertherebarandechotestingprogramsarecompletedanddatahasbeenevaluatedforfinaldeterminationofdamagedarea.AnadditionalNCRwillbeissuedtocoverthedamagedrebarinthecontainmentshield.wall.Architect/EngineerwillissueaDesignChangeNotification(DCN)formifresultingNCRdispositionsrequireredetailingoffloorbeamandslabreinforcingatelevations+43feetand+62feet.Mechanicalsplicingofreinforcingsteelwillbeusedwherelapsplicingisimpractical.InvolvementTheproceduresutilizedtoidentifydamage,evaluateanddispositioncorrectiveactionarethefollowing:1-SiteQualityProcedureSQP-21"CorrectiveActions"-forthehandlingofNCR's.2-EbascoCompanyProcedureE-69"DesignChangeNotification/FieldChangeReport"-forhandlingDCN's.TheFloridaPower8LightCompany'sQualityControlDepartmenthasindependentlyreviewedthedamagedareasandissuedNCR'stoidentifydamagedareasandequipment.Theywillthenfollow-upthecorrectiveactiondispositionedbyEngineeringandapplythenormaltestingandinspectionrequirementsforfinalapproval.AnyNCR'sthatrequireredetailingwillbehandledbyEngineeringviaDCN's.'55InadditiontotheabovenormalQCinspectionandapprovalprocessanddocumentation,thestormdamageteamhasphotographedandmappedthedamagedareastopermitadditionaldocumentationontheextentofdamage.~4S IV.SAFETYIMPLICATIONSTheChicagoBridge6IronderrickfailurecausedsignificantdamagetotheReactorAuxiliaryBuildingstructurewhichrequiresextensiveevaluationandrepairtoestablishtheadequacyofthestructuretoperformitsintendedsafetyfunctionandmeetthecriteriaandbasesstatedinthePreliminarySafetyAnalysisReport.Ifitweretohaveremaineduncorrected,.thestructuraldamagecouldhavepossiblyaffectedthesafetyofoperationsoftheplant.Anextensiveinvestigationisbeingperformedtoidentifytheextentofdamage.Norepairworkornewconstructionwillproceedintheaffectedareasuntileachareahasbeenspecificallyevaluatedand,wherenecessary,repairmeasuresapprovedbytheArchitect/Engineer.Adequatedocumentation~~isbeingmaintainedtoallowanalysisandevaluationofthedeficiencyandIofthecorrectiveactiontakenandthecompleteddocumentationpackagewillbeapartofthefinalreport.V.CONCLUSIONCI~~QTheChicagoBridge6IronderrickfailurewasdeterminedtobeapotentiallyreportableaccidentonSeptember4,1979andsuchnotificationwasmadetotheNRCInspectionandEnforcementOfficethesameday.Priortoanyrepairworkornewconstructionintheaffectedareas,eachareaisspeciallyevaluatedforstructuralsoundnessandrepairmeasuresapproved.Adequatedocumentationonthestructuralevaluationandrepairworkismaintained.,Subsequenttocompletingtheplannedactionofidentifyingdamageandtheplannedcorrectiveactions,afinalreportwillbesubmittedtotheNRC.Thereportwillincludeadescriptionofthedeficiency,an.analysisofthesafetyimplicationsandthecorrectiveactionstaken.'r,~~r(e.g.,updateddrawings,testresults,copi.esofNCR'sandtopermitanalysisandevaluationofthedeficiencyandofwtIaction.ThefinalreportwillbesubmittedbyFebruary1,SufficientinformationDCN's)willbeprovidedthecorrective1980.~*r~~"rI-rIrrr~'I*'EIrr-"~*Icc Table1DisositionedConcreteNCR'sIssuedNCR'sCatepriesCoveredbNCR830CInteriorwallandprojectingBentrebarsreinforcingRebendrebarstooriginalpositions846Cg848C,850Cinwallsandcolumns831C,Columns,wallsandprojectingSpalledconcrete841C,845C,reinforcingandbentrebarsChipconcreteback1'-6,cutoffdamagedrebarsandmechanicallysplicerebars8350ingandbentrebarsWallandprojectingreinforc-CrackedconcreteChipback1ft.intosoundconcreteandmechanicallysplicerebars832CColumnsandprojectingrein-BentrebarsforcingChipconcretebacktospecifiedelevationforfullrebarlabspliceandinstallnewrebar833CforcingfloorlevelColumnsandprojectingrein-CrackednearChipconcretecolumnandreplacedamagedreinforcing Table2DissitionedElectricalNRC'sIssuedHCR'sEuientCoveredbNCRDissition839Et840EConduitsonelevation+62feetRemovedamagedconduitandreplacewithnew837ECabletrayrestraintsonelevations+43feetand+62feetTworestraintsaretoberepairedbyConstructiontowithinAISCtolerances.Balancetobescrapped.~I~~CI~IaI~~

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