ML17333A828

Application for Amends to Licenses DPR-58 & DPR-74, Modifying TS 4.7.5.1.e.2 Which Describes Control Room Ventilation Sys Autostart Functions

ML17333A828
Person / Time
Site:	Cook
Issue date:	03/26/1997
From:	FITZPATRICK E AMERICAN ELECTRIC POWER CO., INC., INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17333A829	List: ML17333A828 ML17333A830
References
AEP:NRC:0398AS, AEP:NRC:398AS, NUDOCS 9704010316
Download: ML17333A828 (8)

Text

CATEGORY'>>REGULATINFORMATIONDISTRIBUTION.'STEM(RIDS)ACCESSIONNBR:9704010316DOC.DATE:97/03/26NOTARIZED:YESDOCKETTACIT>..50-315DonaldC.CookNuclearPowerPlant,Unit1,IndianaM05000315,'0-316DonaldC.CookNuclearPowerPlant,Unit2,IndianaM05000316AUi'H.NAMEAUTHORAFFILIATIONFITZPATRICK,E.AmericanElectricPowerCo.,Inc.FITZPATRICK,E.IndianaMichiganPowerCo.(formerlyIndianaaMichiganEleRECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)

SUBJECT:

ApplicationforamendstolicensesDPR-58aDPR-74,modifying'TS4.7.5.l.e.2whichdescribescontrolroomventilationsysautostartfunctions.DISTRIBUTIONCODE:A001DCOPIESRECEIVED:LTRENCLSIZE:TITLE:ORSubmittal:.GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-3LAHICKMANiJINTERNAL:2+8GENM1NRR/DE/EMCBNRR/DSSA/SPLBNUDOCS-ABSTRACTEXTERNAL:NOACCOPIESLTTRENCL11111111111111RECIPIENTIDCODE/NAMEPD3-3PDNRR/DE/ECGB/ANRR/DRCH/HICBNRR/DSSA/SRXBOGC/HDS2NRCPDRCOPIESLTTRENCL1111111110110DUENOTETOALL"RZDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083TOTALNUMBEROFCOPIESREQUIRED:LTTR13ENCL12 FM"IndianaMichigan~PowerCompany500CircleDriveBuchanan,Ml491071395INQMNSlMICNIayANPOMfMMarch26,1997DocketNos.:50-31550-316AEP:NRC:0398ASU.S.NuclearRegulatoryCommissionATTN:DocumentControlDeskWashington,D.C.20555Gentlemen:DonaldC.CookNuclearPlantUnits1and2TECHNICALSPECIFICATIONCHANGEREQUESTCONTROLROOMVENTILATIONSYSTEMREVISEAUTOSTARTDESCRIPTIONThi'sletteranditsattachmentsconstituteanapplicationforamendmenttothetechnicalspecifications(T/Ss)forDonaldC.CookNuclearPlantunits1and2.Specifically,weproposetomodifyT/S4.7.5.1.e.2whichdescribesthecontrolroomventilationsystemautostartfunctions.Attachment1providesadetaileddescriptionoftheproposedchanges,thejustificationforthechanges,andourdeterminationofnosignificanthazardsconsiderationperformedpursuantto10CFR50.92.Attachment2containstheexistingT/Spagesmarkedtoreflecttheproposedchanges.Attachment3containstheproposedrevisedT/Spages.Webelievetheproposedchangeswillnotresultin:(1)asignificantchangeinthetypesofanyeffluentthatmaybereleasedoffsite;or(2)asignificantincreaseinindividualorcumulativeoccupationalradiationexposure.TheseproposedchangeshavebeenreviewedandapprovedbythePlantNuclearSafetyReviewCommitteeandtheNuclearSafetyandDesignReviewCommittee.Incompliancewiththerequirementsof10CFR50.91(b)(1),copiesofthisletteranditsattachmentshavebeentransmittedtotheMichiganPublicServiceCommissionandtotheMichiganDepartmentofPublicHealth.Thisletterissubmittedpursuantto10CFR50.30(b),and,assuch,anoathstatementisattached.Sincerely,EC~~E.E.FitzpatrickVicePresidentSWORNTOANDSUBSCRIBEDTcP~DAYOFBEFOREMEPHOOI11997NotaryPublicMyCommissionExpires:~+/330052/jenAttachments97040i03ib970326PDRADCICKOS0003iSPPDRllll3ItlllllIIllllllllllElllf]flJCllllll'ANICEM.BICKERSEOBiyFi:blEEEiienCDEily,hyMyCommissionExpiresFeb.16,2001 U.S.NuclearRegulatoryCommissionPage2cc:A.A.BlindA.B.BeachMDEQ-DW&RPDNRCResidentinspectorJ.R.PadgettAEP:NRC:0398AS ATTACHMENT1TOAEP:NRC:0398ASDESCRIPTIONANDJUSTIFICATIONOFCHANGES10CFR50.92ANALYSISFORCHANGESTODONALDC.COOKNUCLEARPLANTUNITS1AND2TECHNICALSPECIFICATIONS Attachment1toAEP:NRC:0398ASIntroductionPage1ThepurposeofthesechangesistoclarifythedescriptionofcontrolroomventilationsystemoperationthatisincludedinthepresentT/Ss.ThesechangeswereoriginallyproposedtotheNRCinourletterAEP:NRC:08560,datedJuly10,1986,aspartofalargergroupofproposedchangesrelatedtoNUREG0737ZtemZIZ.d.3.4,"ControlRoomHabitability."Thesechangesweresubsequentlywithdrawn,andsubmittedinrevised>>forminourletterAEP:NRC:0398R,datedJune29,1989.Forreasonsunrelatedtothespecificchangesproposedinthisletter,thechangeswereagainwithdrawn(ref.AEP:NRC:0398T,datedJune15,1990),peragreementwiththeNRC,withanunderstandingthattheywouldberesubmittedfollowingNRCapprovalofour10CFR50AppendixBcontrolroomdoseanalysesthatweresubmittedseparatelyinourletterAEP:NRC:0398AA,datedApril7,1995.InordertoensurethatourT/Ssaccuratelydescribethedesignofthecontrolroomventilationsystem,andfollowingdiscussionswithourNRCresidentinspector,wenowareproposingtoresubmitthespecificchangesdescribedbelow,apartfromthoselastproposedinAEP:NRC:0398R.ThechangessubmittedheredonotdependonthecontrolroomdosecalculationscurrentlyunderNRCreview.ControlRoomVentilationSstemVariousroomsareservedbythecontrolroomventilationsystem,includingthecontrolroomitself,theHVACmachineroom(whichhousesthevariousventilationequipment),andthecomputerroom.Duringnormaloperation,outdoorairisdrawnintothesystemthroughthenormalairconditioningunitsandsuppliedtothecomputerroomandthecontrolroom.Thecomputerroomandthemachineroomareconnectedbyanopengrating.Returnflowisdrawndirectlyfromthecontrolroomandthemachineroom.Intheeventofaradiologicalaccident,thesystemwouldautomaticallyberealignedinthe"pressurization/cleanup"mode.Thiswouldoccuronasafetyinjection(SI)signalfromeitherunit.Inthismode,thepressurizationfansstart,drawingairthroughthecleanupsystem'sroughing,highefficiencyparticulateair(HEPA),andcharcoalfilters.Dampersautomaticallyrealigntopreventunfilteredairfrombeingdrawnintothesystemandtoproviderecirculationcapabilitywithinthethreeroomcomplex.Thepressurizationunitfansmaintainthecontrolroomatpositivepressuretolimitthepotentialinfiltrationofunfilteredradioactiveair.DescritionofandJustificationforChanesAspresentlywritten,T/S4.7.5.1.e.2instructsustoverifyevery18monthsthat:"OnasafetyinjectionsignalfromeitherUnit1orUnit2,oronacontainmentphaseAisolationsignal,thesystemautomaticallydivertsitsinletflowthroughtheHEPAfiltersandcharcoaladsorberbankandthateitherfancanthenbemanuallystartedintherecirculationmode."

Attachment1toAEP:NRC:0398ASPage2ThisdoesnotadequatelydescribetheCookNuclearPlantcontrolroomventilationsystemforthefoilowingreasons:(1)AutomaticsystemactuationoccursonanSIsignalfromeitherunit.TheSIsignalwillalsoinitiatetherespectiveunit'sphaseAcontainmentisolationsignal.However,thecontainmentphaseAisolationsignalwillnotitselfinitiateventilationsystemactuation.(2)IntheeventofanSIsignalfromeitherunit,bothpressurizationfanswouldautomaticallystart.Onefanwouldthenbeturnedoffbytheoperatorssothatproperiodineresidencetimeisobtained.TheT/Sascurrentlywrittenimpliesthatthefansmustbeturnedonmanually.(3)OurcontrolroomventilationunitsdonothaveHEPAorcharcoalbypasses.AirisdrawnthroughtheHEPAsandcharcoalwheneverthepressurizationfansarerunning.Therefore,airisnot"diverted"throughtheHEPAandcharcoal,asstatedinthepresentT/STTocorrecttheseitems,weproposetoreviseT/S4.7.5.1.e.2torequireverificationthat:a)Onasafetyinjectionsignalfromunit1,thesystemautomaticallyoperatesinthepressurization/cleanupmode.b)Onasafetyinjectionsignalfromunit2,thesystemautomaticallyoperatesinthepressurization/cleanupmode.Wehaveseparatedthetestingrequirementsfortheunit1andunit2signalstoemphasizethatthesignalfrombothunitsmustbetested,i.e.,thateither/orisnotsufficient.Thesechangesareadministrativeinnature,intendedtoensurethatthedescriptionofthecontrolroomventilationsystemoperationinT/S4.7.5.1.e.2accuratelyreflectsthesystemdesign.Regardir;(1)above,itisnotedthatanSIsignalistheonlysignalwhichwillcausethephas"Aisolationsignaltobeinitiatedautomatically.AnindependentphaseAisolationsignalcanbegeneratedmanuallyfromthecontrolroom.ThisswitchwouldbeusedbytheoperatorsifitwasdeterminedorsuspectedthatarequiredautomaticphaseAsignaldidnotoccurasaresultofasafetyinjectionsignal.TheemergencyoperatingproceduresrequireverificationthatthecontrolroomventilationsystemhasrespondedappropriatelytoanSIsignal.Automaticstartingofthepressurizationfansandalignmentofeachofthesystemdampersisspecificallyverified.Regarding(2)above,CookNuclearPlantdesignisconservativewithregardtotheT/SdescriptionbecausenobypassdampersmustfunctioninordertoprovideflowthroughthecharcoalandHEPAfilters.Regarding(3)above,CookNuclearPlantdesignisconservativewithregardtotheT/Sdescriptionbecausemanualactionisnot,necessarytoprovideafanstart.Rather,bothfansstartautomatically,andthen,asrequiredbytheemergencyoperating Attachment1toAEP:NRC:0398ASPage3procedure,onefanwouldbeshutdownbytheoperatortoensureadequateiodineresidencetime.ThebasesintheCookNuclearPlantT/Ssdonotspecificallydiscussthesurveillancerequirementaddressedinthisamendmentrequest.However,itwasdeterminedtobeprudenttoaddonepieceofclarifyinginformation.Thefollowingisproposedtobeaddedtotheunit1(unit2)specificationbases:"Theunit1(2)controlroomemergencyventilationsystemoperatesautomaticallyonasafetyinjectionsignalfromeitherunit1orunit2.Theautomaticstartfromunit2(1)isonlyavailablewhentheunit2(1)ESFactuationsystemisactiveinmodes1through4inunit2(1)."ThepurposeofaddingthisparagraphistoclearlyaddressanyoperabilityquestionforthecontrolroomemergencyventilationsystemwithrespecttotheoppositeunitstatusandtheavailabilityoftheSIinitiatingsignal.10CFR50.92AnalsisPer10CFR50.92,aproposedamendmentwillinvolveanosignificanthazardsconsiderationiftheproposedamendmentdoesnot:(1)involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated;(2)createthepossibilityofanewordifferentkindofaccidentfromanypreviouslyanalyzedorevaluated;or(3)involveasignificantreductioninamarginofsafety.Criterion1Thesechangesareadministrativeinnature,intendedtocorrectandclarifytheT/Sdescriptionofcontrolroomventilationsystemoperation.'3ecausenochangestoplantoperationsorphysicalchangestotheplantwilloccurduetothesechanges,theydonotinvolveasignificantincreaseintheprobabilityorconsequencesofapreviouslyevaluatedaccident.Criterion2Becausenochangestoplantoperationsorthephysicalplantwilloccurduetothesechanges,thechangeswillnotcreatethepossibilityofanewordifferentkindofaccidentfromanypreviouslyevaluated.Criterion3Thesechangesareadministrativeinnature,intendedtocorrectandclarifythepresentT/Sswithregardtosystemoperationdescriptions.Thus,thechangesinvolvenoreductioninmarginsofsafety.

ATTACHMENT2TOAEP:NRC:0398ASCURRENTTECHNICALSPECIFICATIONPAGESMARKEDWITHPROPOSEDCHANGES