ML17320A813
| ML17320A813 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 11/04/1983 |
| From: | ALEXICH M P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | DENTON H R Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:0692I, AEP:NRC:692I, NUDOCS 8311110135 | |
| Download: ML17320A813 (6) | |
Text
REGULATOINFORMATION DISTRIBUTION TEM('RIDS)'ACCESSION NBR!8311110135 DOC~DATES83/11/04NOTARIZED'NO
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~'Cook>>Nuclear>>Power-.->>Plantg
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- -DENTONgH,Rs..
Office>>ofNucl'eartReactorIRegulation'irector>>.-SUBJECT;=-)Provides addiinfore>>.ut)18308224submittal "L834021telconre"34h-fireprotection-of>>embedded cables'Twoembedded'ablesfoundw/osufficient"fire barrier~to:provide" 3hrating,Addiinsu1ation~will"be;provided..DISTRIBUTION iCODE>>'AOOSSiCOPIES'RECEIVED:LTR,J,'NCL:,P'SIZE:."'TITLE>,
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rli>:>jfIt INDIANA8MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS, OHIO43216November4,1983AEP:NRC:0692I DonaldC.CookNuclearPlant,UnitNos.1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74FIREPROTECTION FOREMBEDDEDCABLESMr.HaroldR.Denton,DirectorOfficeofNuclearReactorRegulation U.S.NuclearRegulatory Commission Washington, D.C.20555
DearMr.Denton:
Thepurposesofthisletterare(1)toprovideadditional information relatedtoourprevioussubmittal (AEP:NRC:0692H) datedAugust22,1983and(2)toconfirmthetelephone conversation wehadwithyourstaffonFriday,October21,1983concerning three-hour fireprotection ofembeddedcablesattheDonaldC.CookNuclearPlant.Theprevioussubmittal transmitted areport,datedMarch1983,whichwaspreparedbyourconsultants, Engineering PlanningManagement Incorporated (EPM).Thatreportwastitled"Supplemental Information SafeShutdownCapability Assessment andProposedModifications, 10CFR50,AppendixR,SectionIIIG."Section2oftheSupplemental Reportstated,inpart,thattheadditional barriermassbetweentheembeddedcablesandthecoldside(ofthewall)willfunctionasaheatsink,loweringtheactualin-walltemperature attheembeddedcabletoanumbersubstantially lower.thanthe322FusedforthestandardNFPAbarrierrating.Atourrequest,EPMreviewedthebasesemployedintheSupplemental Report.WereceivedaletterfromEPM,datedSeptember 28,1983,concerning theadditional reviews.Theinformation attachedtotheEPMletterstatedthatthecriticaltemperatures atafourinchdepthreachedbetween500Fand600Fafterthreehours.Asdiscussed duringthetelephone conversation, wehavetracedallsafetyrelatedcablesinfirezonestodetermine whichzonesincludedmorethanoneEssential SafetyFeatures(ESF)train.Asaresult,wefoundtwocasesinwhichembeddedcablesdidnothaveasufficient firebarriertoprovideathree-hour zating.Inbothofthesecases,thecableswereinconcretepilasters, whicharenotpartofthestructural wall.Theaffectedpilasters arelocatedinFireZone15inUnit1(i.e.,theredESFdivisional dieselgenerator room)andFireZone19inUnit2(i.e.,thegreenESFdivisional dieselgenerator room).Inbothcases,wewilladdsufficient insulation toprovideathree-hour 8311110135 831104PDRADOCK05000315FPDR 0t"0;fFt,hP~)Jrhf~=)>>III,h'I0P0I'~rhI'hf')0,,f.h'.0'),EI'ff"r'IItffIRrFjI'rf,Hr<<fr)')h~r)Ef1t'"'FI'*'>>qr)~~0'f~hj.fC>><<fI0EItE=h~~hfbiI'hW~--II(hRHfrt~I~0plh",'"hth<<fAI~jl0<<tf'hE)",0'"r),IIRE0hjrth0>>Ijhf')jlht
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Mr.'Harold R.onAEPsNRC:0692I barrier,withoutanyrelianceontheinsulation properties oftheconcrete.
Theinsulation modification willnotrelyonanyconditions addressed intheSupplemental Report.Thisinformation shouldbefactoredintothedata-base foryourSafetyEvaluation Reportonfireprotection which,weunderstand wewillbereceiving shortly.Thisdocumenthasbeenpreparedfollowing Corporate procedures whichincorporate areasonable setofcontrolstoinsureitsaccuracyandcompleteness priortosignature bytheundersigned.
Verytrulyyours,~iM.AlichVicePreidentMPA/pbcc:JohnE.DolanW.G.Smith,Jr.-BridgmanR.C.CallenG.CharnoffE.R.Swanson,NRCResidentInspector
-Bridgman 0~-P1")Fa~~