ML18040B123

Suppls Util 850904 Ltr Re Resolution of Fire Protection Concerns.Listed Replacement Pages Re Sprinkler Protection for Control Structure Elevation & Shutdown Paths Encl

ML18040B123
Person / Time
Site:	Susquehanna
Issue date:	10/03/1985
From:	KEISER H W PENNSYLVANIA POWER & LIGHT CO.
To:	BUTLER W R Office of Nuclear Reactor Regulation
References
PLA-2541, NUDOCS 8510080410
Download: ML18040B123 (15)

Text

'REGULATORINFORMATIONDISTRIBUTIONSSTEM(RIDS)ACCESSION'BRo8510.080410,OOC~DATE!65/10/03NOTARIZED;NOFACIL:50387SusquehannaSteamElectricStationiUnitiiPennsylva50386SusquehannaSteamElectricStationiUnit2'<PennsylvaAUTHBYNAMEAUTHORAFFILIATIONKEISER<H,W.PennsylvaniaPower8'ightCo~RECIP~NAMKlRECIPIENTAFFILXATIONBUTLERgW~RiLicensingBranch2

SUBJECT:

Supplsuti]650904.ltrreresolutionoffire~protectionconcerns.Listedreplacementpages-resprinklerprotectionforcontrolstructureelevation8shutdownpathsencl'ISTRIBUTINCODE:A0060COPIESRECEIVED:L~TR.ENCLSIZE;TITIE:ORSubmittal:FireProte'ctionNOTES:1cyNMSS/FCAF/PM'PDR2cysTranscripts'L:07/17/62icyNMSS/FCAF/PM'PDR2cysTranscripts;OLe03/23/84cocKETe05000387050003880500038705000386RECIPIENTIDCODE/NAMENRRLB2BC01INTERNAL:ACRS11ELD/HDS4NRRSTANGrJ07NRR/DE/CEB09'4COPIESLTTRENCL333302.'2211RECIPIENTIDCODE/NAMEADM/LFMBIENHITNEYILNRRÃERMEILiJ06NRR/DLDIRRGN1COPIESLTTRENCL'011101111EXTERNAL:24XNRCPDRNOTES:02"LPDRNSIC030511TOTALNUMBEROFCOPIESREQUIRED:LTTR25ENCL22 PennsylvaniaPower8LightCompanyTwoNorthNinthStreet~Allentown,PA18101~215/770.5151HaroldW.KeiserVicePresident-NuclearOperations215/770-7502OCTO31985DirectorofNuclearReactorRegulationAttention:Dr.W.R.ButlerLicensingBranchNo.2DivisionofLicensingU.S.NuclearRegulatoryCommissionWashington,D.C.20555SUSQUEHANNASTEAMELECTRICSTATIONRESOLUTIONOFFIREPROTECTIONCONCERNSER100450FILE841-2,143PLA-2541DocketNos.50-38750-388

DearDr.Butler:

ThislettersupplementsPLA-2529,datedSeptember4,1985.Enclosedarereplacementpagesasfollows:~PaePage3ofConcern81DescritionofChaneReviseSection2.2toclarifyuseofnon-ratedboundariesPage2ofRequest/f6inAppendixAtoConcern//1Figure6ofAppendixBtoConcern81SprinklerprotectionfortheControlStructureElevation754'-0"supportsteelispartialprotectionShutdownpaths364wereaddedtozone1-6CFigure9ofAppendixBtoConcernPlShutdownpaths364wereaddedtozone1-6CFigure10ofAppendixBtoConcern81Shutdownpaths3&4wereaddedtozone1-6CFigure11ofAppendixBtoConcernlI1Addedtheamountofcombustibleloadingforzone1-5C"FtaR.OA80<>0"8Seoo3I8510P"ADOCgOSOOO3.(lIDR(OO4 Qg081985Page2SSESPLA-2541ER100450File841-2,143Dr.W.R.Butler~PaeDescritionofChanePage3toAttachment2ofAppendixBtoConcern//1AddednotestopageregardingthecontrolstructureTheabovechangesareeditorialclarificationswhichdonotaffecttheconclusionsoftheanalysis.Shouldyouhaveanyquestionspleasecontactus.Verytrulyyours,H.W.KeiserVicePresident-NuclearOperationscc:M.J.Campagnone-NRCR.H.Jacobs-NRC iii)Identifyingonacasebycasethespecificbarriercomponentswhicharenotratedandprovidingajustificationfortheiruse.Anyadditionalfireratedprotectionrequiredasaresultofthisredefinitionwillbeinaccordancewith10CFR50AppendixR,SectionIII.G.2.2OtherSafetyRelatedBuildingsThemethodologyusedintheControlStructure,theDieselGeneratorbuildingsandtheESSWpumphousewassomewhatdifferentsincethemajorityofthefirezoneboundariesarefireratedand,asaresult,ourfirezoneboundariesareequivalenttofireareaboundaries.Forthesebuildingseachfirezonewasreviewedforitssafeshutdowndivision.Firezoneshavingacommonsafeshutdowndivisionweregroupedintofireareas.Eachfireareawasreviewedtoassurethatallofitsboundarieswerefireratedconstruction,orifanon-ratedboundarywasacceptable.3.0ASSUMPTIONS&NRCGUIDANCE3.1TheanalysiswasperformedinaccordancewiththefollowingNRCguidance:a.10CFR50,AppendixRSectionIII.G.b.c~GenericLett'ers83-33and85-01.INRClettertoPP&LdatedApril18,1985whichstates:"Thereassessmentofnon-ratedconstructionshouldbeinaccordancewithguidancepresentedatthesiteaudit.Thatis,toprovidereasonableassurancethatfirepropagationwillnotoccurbeyondnon-fire-ratedzoneboundaries,theboundariesshouldbeupgraded,tobecontinuousbarrierswithafireratingsufficienttowithstandtheeffectsofafireinvolvingin-situandtransientcombustibles,withconservativemargin.Ifboundaryconstructionisnotupgraded,yourreassessmentshouldassumethatfirespreadwilloccurintothenextmostimmediatefirezone(horizontallyand/orvertically)."3.2Theanalysisperformedwasbasedonthefollowingassumptions:aOTheconcreteblockorreinforcedconcreteusedintheconstructionofwalls,floorsandceilingsareacceptableasbeingfirerated.,b.EvaluationofthefireratingofexistingdoorsbyFactoryMutualResearchisacceptabletotheNRCstaff.C~TheunprotectedstructuralsteelwillbeshowntobeacceptableusingamethodologyacceptabletotheNRC.w3

~h~pPPDNKP',QP1+~,'rP1hPfP'~tC FIREZONEBELOW/FIREZONEABOVESPRINKLERPROTECTIONBELOWSTRUCTURALSTEELREQUESTNO.6PAGE2COMBUSTIBLELOADINGUnit82-ReactorBuilding(Cont.)2-3B-N/2-4A-S2-3B-N/2-4G2-3B-W/2-4C2-3B-W/2-4D2-4A-S/2-5A-W2-4A-W/2-5A-N2-4A-W/2-5A-W2-4G/2-5B2-4A-W/2-5E2-4A-W/2-5F2-4A-W/2-5G2-5A-S/2-6A2-5C/2-6A2-6A/2-4GYesYesYesYesYesYesYesNoYesYesYesYesNoNo16min16min16min16min15min15min15min4min15min15min15min6min6min6minControlStructureElevation754'-0SupportSteelJUSTIFICATION:Yes(Part)62minUnit81andI/2ReactorBuildings:ltAllfirezoneshavesprinklerprotectionbelowtheexposedstructuralsteel'xceptforFireZonesl-lE,1-1F,2-1E,2-1F2-4G,2-5Cand2-6A.Inthesefirezonesthemaximumcombustibleratingis18minutes,andminimaltransientcombustiblesareexpected.Finally,thein-situcombustiblesinthesefirezonesaregenerallylocatedneartheflooratadistancefromwherethestructuralsteelformingthefireareabarrierislocated.CONTROLSTRUCTURE:Automaticdetectionandprotectionisprovidedbelowtheexposedstructuralsteel.Themajorityofthecombustiblesintheareabelowtheexposedstructuralsteelarecables.Themajorityofthecablesarelocatedeitherbelowtheraised(computertype)floorintheControlRoomorin2hourfireratedcablechasesonthenorthandsouthwallsofthecontrolstructurewhereonlyonestructuralmemberiseffected.Thereisapproximately20feetbetweentheraisedcomputerfloorandtheexposedstructuralsteelsupportingelevation754'-0.Finally,theControlRoomcomprisesthemajorityoftheareabeneaththissteelanditiscontinuallystaffed.EXEMPTIONREUEST:Exposedstructuralsteelsupportingtheidentifiedfireareabarriersisacceptableanddoesnotrequ9.refireproofing.djk/h188c3:del CONTROLSTRUCTUREFIREAREACS-1CS-2CS-3CS-4CS-5CS-6CS-7CS-8CS9k*CS-10~*CS-11CS-12CS-13CS-14CS-15CS-16CS-17CS-18CS-19CS-20CS-21CS-22CS-23CS-24CS-25CS-26CS-27CS-28FIREZONE(S)0-21B,029A0-22B,0-29C,D0-21A,0-22A,0-22C,0-23,0-24A-G,0-25A,E0-24I,L0-24K0-24J,0-25B,0-26B,S,0-27F,0-28P0-24L,M,0-25C,D,0-26C,D,0-26T,V,0-27G,H,0-28Q,R0-28S0-26A,E-N,P,R0-27A-E0-28ASubzoneI(RoomC-613)0-28C0-28E0-28G0-28H0-28J0-28BSubzoneI(RoomC-604)0-28M0-28N0-28ASubzoneII(RoomsC-611,C-612)0-28T0-28D0-28Fn0-28BSubzoneII(Rooms'C-605,C-606)0-28I0-28K0-28L0-29B,0-30A,B**Thesefirezonescontainnosafeshutdowncablesandfunctionasastbufferiesfirezone**Thefloor/ceilingbetweenFireAreaCS-9andCS-10hasunprotectedsupportsteel.SeeExemptionRequestNumber6.tag/h253c3:del 4~~>.~at.COMOQlLL2.-1I.Ql(yy<~N/AOelg~z=si'/O<Ozg2-46Q~Q4l-l47l:QIQi~s/Og/'4G010>,O+/04igIIII'AI'1-4/9Ql.I-IZQIO<Q~Q4~NAI~2GB-QIQQ4~s2-4FsQaA~2-4FQIQ<SQ4~N/A0-HOI02P204NOI!IE.it/"8QlI~l-6)FP0~04~NIA1-QlQ2I~I4F10204~I-IS'lQiQ~Q4.i.~le0>~~e0~2-4EQ!Q04I~Z-I.CQlQ>Q<I1-2l'~Q4~NIA~I-IOQIQ<O>Q40>O~1-13'/020~04~A~N/AQa4lA2'02"13'IQ>Q>Q4.'~N/AIOBAYS52"t-0=2,70-0"LQXUzC)aXJIZ,Q57.4:::3G.34.53'l.5.=.30.52'027.5FLOQPPLANeEL.175-IER-ER-SCALE-DATE-DRAWN-23.520.C0;077/5NO.DATEER.DECIMALREVISIONRIACTIONALLOCATIONCODECH.BYAPPROVEDCHECKED-LEADER-APPR'D.APPR'D.DESCRIPTIONPINN$Yl.VANIAPOND.RaLIGHTS(ONPAHYALLENTOWN,PA.APPROVEDI

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