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)

Text

InterimConstruction Deficienc ReortDamaeResultinFromDerrickFailureDurinHurricane DavidName,ofStation:Owner:Architect/Engineer:

DateofDeficiency:

InterimReportFiled:St.LuciePlant-Unit52FloridaPower6LightCompany.EbascoServices, Incorporated, September 3,1979October4,1979

I.SUMMATEOnMondaymorning,September 3,1979,atapproximately 10:45a.m.,theChicagoBridgeaIronguyedderrickbuckled,twisted,andcollapsed duringHurricane David.Thelowerportionofthederrick(belowelevation

+192feet)didnotcollapseandwasleaningataslightanglefromthe,vertical, remaining bracedtothecontainment shieldwallbyvirtueofthehorizontal strutbraces.Theupperportionofthederrickbecamedismembered andfourmajorsectionscametorestinorontheReactorAuxiliary Building.

Aportionoftheboomremainedsuspended byguywiresfromthetopofthecontainment shieldwall.Theguywiresperformed theirintendedfunctionanddidnotfail.Pertherequirements of10CFR50.55(e),

theeventisreportable becausethederrickfailurecausedsignificant damagetosafetyrelatedstructures and,weretheytohaveremaineduncorrected, couldadversely affectthesafetyofoperations oftheplant,anddoesrequireextensive evaluation andrepair.Notification oftheincidentwastelephoned intotheNRCInspection andEnforcement OfficeonSeptember 4,1979(approximately ll:45a.m.)byMr.N.Weems,FloridaPoweraLightCompany's Assistant Manager,QAConstruction.

Afternumerousonsiteinspections, engineering isintheprocessofdeveloping anddispositioning corrective actionsforthedamagedareas.Subsequent toaforementioned inspections, onsiteconfixmatory destructive andnon-destructive testingwillbeimplemented andanyadditional corrective actionwillbeissuedbyengineering ifrequired.

Aninterimreportisbeingsubmitted whileinvestigation ofthedamagedareasisstillongoingandrepairworkisproceeding.

II~DESCRIPTION TheconcreteShieldBuildingandtheReactorAuxiliary Buildingwereattherfollowing stagesofconstruction whenthehurricane passedthejobsite:TheconcreteShieldBuildingcylinderhadbeencompleted toelevation

+191.42feetandtheReactorAuxiliary

Building, beingconstructed inastaggered manner,hadwallsandcolumnscompleted totheunderside offloorslabsatelevations

+43feet,+62feetand+82feet.

IIl

'II.DESCRIPTION (continued)

ComletedActionstoIdentifDamaeAstormdamageteamwasassembled todetermine anddocumenttheextentofdamageresulting fromthederrickfailure.Theteamconsisted ofaconstruction civilengineerandtwoassistant civilengineers.

Inconjunction, theArchitect/Engineer has'isited thejobsite,bothbeforeandafterderrickremovalandcleanup,toobservethedamage,andtoconfirmthetaskforcefindings.

Areascompletely unaffected bythederrickfailurehavebeenreleasedforcontinued plannedconstruction.

Investigations areongoingtodetermine ifandwheredestructive andnon-destructive testingshouldbeperformed beforereleasing areasadjacenttoareasdamaged.Thedamagetothecontainment shieldwallwaslimitedtobentandsheareddowelsprojecting fromthetopofthecylinderwallandasmallsurfacegaugeontheexteriorwall.Themappingofthisdamagedareahasnotyetbeencompleted.

Thedamage'ithin theReactorAuxiliary Buildingwasextensive andconsisted ofpenetration offloorslabs,shattered floorbeam;spalledconcrete, andbentandsheareddowelsforcolumnsandwalls.Thereisapossibility ofsomecrackingofsomefloorbeamsandgirdersandoneexteriorwallsection.Thelocationofderrickandboom'ection restingpositions, anddetailsofobserveddamagetotheReactorAuxiliary Buildingispresented ontheenclosedsketches, SK-2998-FG 75.01to75.06.Inadditiontothenoted.damageontheattachedsketches, crackswereobservedonthesurfaceofafewelevation

+43feetfloorbeams.Thesecrackswerechippedbacktodetermine depthandwereobservedtobeonlysurfaceshrinkage cracks.hTInadditionto.the.abovestructural damageintheReactorAuxiliary BuildingIII~Ithefollowing isalistingofdamagedequipment andsupports:

1-Conduitonelevation

+43feet2-Cabletrayrestraint onelevations

+43feetand+62'eet3-4.16KVSwitchgear 2A3-1,2,3,4,5,6,7,8-Y~~='~","

I4-StationServiceTransformer 2A2'g'CPh,'.,

h*5-480VSwitchgear 6-Pressurizer heater'buses2A3and2B3T~',4'CIh,T~ITth'h'

~q~~II.DESCRIPTION (continued)

PlannedActionstoFurtherIdentifDamaeArchitect/Engineer hasdirectedConstruction toproceedwithtwotestingprogramstoconfirmtheextentofdamagewithintheReactorAuxiliary Building.

Thefirstprogramrequirestestingofreinforcing steelsamplesremovedfromthedamagedfloorbeamsandslabsatelevation

+62feet.Testresultswillindicateifthereinforcing whichextendsintothesurrounding soundconcretehadbeenoverstressed duringmissileimpact.Thesecondprogramrequiresnon-destructive testingofconcretemembers,1)adjacenttodamagedfloorslabareasatelevations

+43feetand+62feet,including allthebeamsatelevation

+43feetwhichwereobservedtohaveonlysurfacecracks,and2)inanexteriorwallalongthenorthsideofthebuildingwhichhadonlyfivedayconcretestrengthwhenasectionofthyderrickhitthetopofthewall.Thepulseechomethodwasselectedandwillbeperformed byMuenowandAssociates ofCharlotte, NorthCarolina.

TheattachedFigures1and2showtheconcretememberstobeinvestigated.

Inaddition, thedamagedareasonthecontainment shieldwallwillbemappedandevaluated priortoanyrepairworkbeinginitiated.

III.CORRECTIVE ACTIONSComletedCorrective ActionsFloridaPower6LightCompany's QualityControlDepartment hastheresponsibility topreparenonconformance reports(NCR's)wheredamagehasoccurredtocompleteconstruction activities (i.e.,afterconcreteplacement)or isalistofdispositioned NCR'ssummarizing categories ofItypesofdamageandcorrective actiontobetaken.equipment.

Table1structural members,Table2isalistofcurrently dispositioned NCR'ssummarizing theequipment damageandcorrective actiontobetaken,-'additional NCR'swillbeissuedasrequired.

glrThreeadditional NCR's(834C,842Cand851C)havebeenissuedforthedamagedconcreteandreinforcing withinslabsandbeamsatelevations

+43feet.

'~~III.CORRECTIVE ACTIONS(continued)

PlannedCorrective Actions'continued)

TheseNCR'swillnotbedispositioned untilaftertherebarandechotestingprogramsarecompleted anddatahasbeenevaluated forfinaldetermination ofdamagedarea.Anadditional NCRwillbeissuedtocoverthedamagedrebarinthecontainment shield.wall.Architect/Engineer willissueaDesignChangeNotification (DCN)formifresulting NCRdispositions requireredetailing offloorbeamandslabreinforcing atelevations

+43feetand+62feet.Mechanical splicingofreinforcing steelwillbeusedwherelapsplicingisimpractical.

Involvement Theprocedures utilizedtoidentifydamage,evaluateanddisposition corrective actionarethefollowing:

1-SiteQualityProcedure SQP-21"Corrective Actions"-forthehandlingofNCR's.2-EbascoCompanyProcedure E-69"DesignChangeNotification/

FieldChangeReport"-forhandlingDCN's.TheFloridaPower8LightCompany's QualityControlDepartment hasindependently reviewedthedamagedareasandissuedNCR'stoidentifydamagedareasandequipment.

Theywillthenfollow-up thecorrectiveaction dispositioned byEngineering andapplythenormaltestingandinspection requirements forfinalapproval.

AnyNCR'sthatrequireredetailing willbehandledbyEngineering viaDCN's.'55InadditiontotheabovenormalQCinspection andapprovalprocessanddocumentation, thestormdamageteamhasphotographed andmappedthedamagedareastopermitadditional documentation ontheextentofdamage.~4S IV.SAFETYIMPLICATIONS TheChicagoBridge6Ironderrickfailurecausedsignificant damagetotheReactorAuxiliary Buildingstructure whichrequiresextensive evaluation andrepairtoestablish theadequacyofthestructure toperformitsintendedsafetyfunctionandmeetthecriteriaandbasesstatedinthePreliminary SafetyAnalysisReport.Ifitweretohaveremaineduncorrected,.

thestructural damagecouldhavepossiblyaffectedthesafetyofoperations oftheplant.Anextensive investigation isbeingperformed toidentifytheextentofdamage.Norepairworkornewconstruction willproceedintheaffectedareasuntileachareahasbeenspecifically evaluated and,wherenecessary, repairmeasuresapprovedbytheArchitect/Engineer.

Adequatedocumentation

~~isbeingmaintained toallowanalysisandevaluation ofthedeficiency andIofthecorrective actiontakenandthecompleted documentation packagewillbeapartofthefinalreport.V.CONCLUSION CI~~QTheChicagoBridge6Ironderrickfailurewasdetermined tobeapotentially reportable accidentonSeptember 4,1979andsuchnotification wasmadetotheNRCInspection andEnforcement Officethesameday.Priortoanyrepairworkornewconstruction intheaffectedareas,eachareaisspecially evaluated forstructural soundness andrepairmeasuresapproved.

Adequatedocumentation onthestructural evaluation andrepairworkismaintained.,

Subsequent tocompleting theplannedactionofidentifying damageandtheplannedcorrective actions,afinalreportwillbesubmitted totheNRC.Thereportwillincludeadescription ofthedeficiency, an.analysisofthesafetyimplications andthecorrective actionstaken.'r,~~r(e.g.,updateddrawings, testresults,copi.esofNCR'sandtopermitanalysisandevaluation ofthedeficiency andofwtIaction.Thefinalreportwillbesubmitted byFebruary1,Sufficientinformation DCN's)willbeprovidedthecorrective 1980.~*r~~"rI-rIrrr~'I*'EIrr-"~*Icc Table1Disositioned ConcreteNCR'sIssuedNCR'sCatepriesCoveredbNCR830CInteriorwallandprojecting Bentrebarsreinforcing Rebendrebarstooriginalpositions 846Cg848C,850Cinwallsandcolumns831C,Columns,wallsandprojecting Spalledconcrete841C,845C,reinforcing andbentrebarsChipconcreteback1'-6,cutoffdamagedrebarsandmechanically splicerebars8350ingandbentrebarsWallandprojecting reinforc-CrackedconcreteChipback1ft.intosoundconcreteandmechanically splicerebars832CColumnsandprojecting rein-BentrebarsforcingChipconcretebacktospecified elevation forfullrebarlabspliceandinstallnewrebar833CforcingfloorlevelColumnsandprojecting rein-CrackednearChipconcretecolumnandreplacedamagedreinforcing Table2DissitionedElectrical NRC'sIssuedHCR'sEuientCoveredbNCRDissition839Et840EConduitsonelevation

+62feetRemovedamagedconduitandreplacewithnew837ECabletrayrestraints onelevations

+43feetand+62feetTworestraints aretoberepairedbyConstruction towithinAISCtolerances.

Balancetobescrapped.

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