ML17331A772

Forwards Info Re Engineering Description,Test Procedures, Background Info,Generic Operating Guidelines & Supporting Details for Reactor Vessel Head Vents,In Response to NUREG- 0737,Item II.B.1

ML17331A772
Person / Time
Site:	Cook
Issue date:	07/15/1981
From:	HUNTER R S INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	DENTON H R Office of Nuclear Reactor Regulation
Shared Package
ML17319A959	List: ML17319A958 ML17319A960 ML17319A961 ML17319A962 ML17319A963 ML17331A772
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.1, TASK-TM AEP:NRC:0584, AEP:NRC:584, NUDOCS 8107210416
Download: ML17331A772 (9)

Text

ACCEREGULATORY NFORMATION DISTRIBUTION SYTEM(RNNBRNB107210416 DOCIDS)FACILE:50'15 DonaldC~CookN'4107/15NOTAR'xcKD)

NO50316DonaldCCk.N,owerPlantiUnitfrIndianaS,p5H.NAME<AUTHORAFFILIATION:

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IndianaLMichianDENTONO'oNIOfficeofNuclearReactor"RltieguaonrDirector~

SUBJECT':."

Forwardsinforeienginee'ring, describakodifodetailsfor=reactor" vesselecor"vesselheaventsrfnresponse, toNUREGDISTRIBUTIO NCODE~)A046SCOPIKSRECElIVED:

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02'1INPOrJEST'ARNES NSIC04A/DCSS'NG22'/DGENPROJ31A/DMLQENG23A/DPLANTSYS25A/DSAFETYAS17D.IR'rEM=PREP33DIRECTOR'p DHFS28DIRECTOR'g DSI24EMERGPREPDEVFKMA<<REPDIVOELDPDREGFCOPIKSLTTR>>ENCL<11=111111111.1>>l.1~1111=011f111,-)ak'g~gglTOTALNUMBERSOFCOPIESREQUIREDj-"LiTTR5ENCL I"'~<<rtlj4~jW.~'"fbi<<I0~IIIIlb'I4~kjbC<<l',',It'I~<<bIII<<I41lb<~ItIWgbI~'II"~'II"II<<14I<<II~IiW*~<<g~,I<<rtW'$4NWi'I'1<<<<WqjtWlttf'WCt<<1CqNC,tfI<<'IvpbII INDIANALMICHIGANELECTRICCOMPANYP.O.BOX18BOWLINGGREENSTATIONNEWYORK,N.Y.10004July15,1981AEP:NRC:0584 DonaldC.CookNuclearPlantUnitNos.1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74NUREG-0737; ITEMII.B.1-REACTORCOOLANTSYSTEMVENTSMr.HaroldR.Denton,DirectorOfficeofNuclearReactorRegulation U.S.NuclearRegulatory Commission Washington, D.C.20555

DearMr.Denton:

Thisletteranditsattachments documenttheengineering description, testprocedures, background information, genericoperating guidelines andsupporting detailsforthereactorvesselheadventsbeinginstalled inbothUnitsoftheDonaldC.CookNuclearPlant.Morespecifically, theattachments tothislettercontainthefollowing information:

Attachment 1:Abriefdescription ofthedesign,operation andtestingrequirements Attachment 2:Attachment 3:Background Information forPressurizer VentingOperation-Rev.0,datedMarch1981.sPressurizer VentingOperation

-Rev.0,datedMarch1981.Attachment 4:Background Information forReactorHeadVentOperation-Rev.0,,datedFebruary1981.Attachment 5:ReactorVesselHeadVentOperation

-Rev.0,datedFebruary1981.8107210416810715IPDRADQCK05000315PPDR(/(

-'TIJV>II)J' Mr.'arold R.DentonAEP:NRC:0584 Attachment 6:Thefollowing Supporting Information isattached:

a)Suggested Technical Specifications.

b)FlowDiagramoftheReactorHeadVentSystem(Figure1).c)d)FlowDiagramofthePressurizer VentSystem(Figure2).LogicDiagram(Figure3).e)Elementary WiringDiagram6.Formalsubmittal ofTechnical, Specifications'will takeplaceonce,thesys-temdesignisfinalized.

Westinghouse reportWCAP-9600, "ReportonSmallBreakAccidents forWestinghouse NSSSSystem",June1979,Section3.9hasbeenusedas.areference indeveloping thedesignoftheventsystem.Thisinformation isprovidedasrequested inItemII.B.lofNUREG-0737.TheReactorCoolantSystemVentingSystemsattheCookPlantwillbeimplemented bytherequireddateofJuly1,1982.Verytrulyyours,.S.unterVicePresident cc:JohnE.Dolan-ColumbusR.C.CallenG.CharnoffR.W.Jurgensen D.V.Shaller-BridgmanJoeWilliams, Jr.RegionIIIResidentInspector

-Bridgman fIl'I ATTACHMENT 1TOAEP:NRC:05 DescritionofDesinThereactorCoolantVentSystemiscomprised oftheReactorHeadVentSystemandthePressurizer VentSystem.IthasbeendesignedtoventavolumeofHydrogenapproximately equaltoone-halfofthere-actorcoolantsystemvolumeinonehouratsystemdesignpressureandtemperature, Eachofthesesubsystems consistsoftwoparallelflowpaths.'."oneinchinsize,withredundant isolation valvesineachflowpath.A3/8"orificehasbeeninstalled upstreamoftheisolation valvestolimittheflowinthecaseofabreakdownstream oftheorificestowithinthecapacityof;-onecentrifugal chargingpump.AbreakofanRCSVentLineupstreamof,theorificeswouldresultinasmallLOCAnotgreaterthan.oneinchindiameter.

ThistypeofbreakhasbeenanalyzedinWCAP-9600 (Reference 1)andwouldbehavesimilarly tothehotlegbreakpresented

.inthisreport.Therefore abreakintheventlinewouldnotresultin.acalculated coreuncover.Alockedopenhandvalvewillbeinstalled upstreamofthe3/8"orifices.

Theisolation valvesareD.C.powered,failclosed,solenoidvalveswithstempositionswitches.

Thesevalvescanbeoperatedfrom.'hecontrol.room..Theywillbeno@nallyclosedduringplantoperation.

Indicating

'hghtswillbeinstalled inthecontrolroomsotheoperators willknowtnevalveposition.

Thesevalveswillbequalified toIEEE-323-1974,IEEE-344-1975 an'dIEEE-383-1972.

RTDassemblies havebeenaddeddownstream ofthesolenoidvalvestodetectleakagethroughthesevalves..TheseRTD"ssemblies willsetoffanalarminthecontrolroomifleakagethroughthevalvesshouldoccur..Thereactorvesselheadventconnectstoapart-length controlroddrivemechanism housinglocatednearthecenterofthereactorhead.Thepressurizer ventisconnected tothepressurizer reliefline.Thepossibility ofreactorcoolantpressureboundaryleakageisminimized becauseofthetwoisolation valvesinseries.Isolation valvesinoneflowpatharepoweredbyTrainAandthevalvesinthesecondflowpatharepoweredbyTrainB.Boththereactorheadventandthepressurizer ventdischarge intotheuppervolumeofthe.containment atapprox.elevation 673'-0",inanareawhichwillprovideadequatedilutionofanycombustible gas. Allpipingandequipment usedinthereactorheadventfromthepart-length rodhousingtotheorificesandallpipingandequipment usedinthepressurizer ventfromthepressurizer reliefpipingtotheorificesaredesignedinaccordance withASME,SectionIIIClass1requirements.

Fromtheorificesuptothefirstanchordownstream ofthesecondisolation valvethepipingandequipment hasbeendesignedinaccordance withASMESectionIIIClass2requirements.

Theremainder ofthepipingisdesignedtoAEPSeismicClass1Level4.~TestinTheisolation valvesusedonthereactorheadventandpressurizer-ventwillbetestedinaccordance withsubsection IWV-3000ofASMESectionXIforCategoryBvalvesduringrefueling outages.~OtalPdThefollowing procedures areattachedandaregenerically applicable totheD.C.CookPlant.1.Background Information for'Pressurizer VentingOperation

-Rev.0datedMarch1981.2.Pressurizer VentingOperation-Rev.0datedMarch1981.3.Background Information forReactorHeadVentOperation

-Rev.0datedFebruary1981.4.ReactorVesselHeadVentOperation

-Rev.0datedFebruary1981.References 1.WCAP-9600, "ReportonSmallBreakAccidents forWestinghouse NSSSSystem,"June1979,(specifically Case.FSection3.2).

ATTACHMENT ET0AEP:NRC:0584