ML17329A066
| ML17329A066 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/30/1990 |
| From: | SAVITSCUS C WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML17329A065 | List: |
| References | |
| 12-NI-05, 12-NI-5, NUDOCS 9106270137 | |
| Download: ML17329A066 (30) | |
Text
NEP-6.4A"(S/8~)TasnaMsu~nowgCodTRoL,S SECTIONCALCULATION ANALYSISNuclearEngineering Department
/P~/'szcT70rv ZlZSHEETXOP~3I.D.NO.I~+I<5SAFETYRELATEDYESNOXSYSTEMI0P5TITLEtTOPSErol~lCa/CpuuvzCodK Nues(@AD, UNxz~COMPANYCHAH,L.PSSAV/15Cceo7-ZZ-9OCALCULATED BY:PILELOCATION~C,l2-W/-0MICROFILM NO.CHECKEDBY:APPROVEDBY-DATE~jzo/aDATE/~DATEPROBLEMDESCRIPTION:
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datedMay,1988becameofficialwithit'spublication inthefederalRegisteronJune8,1988.Theguiderevisesthegeneralprocedures acceptable totheNRCstaffforcalculating theeffectsofneutronradiation embrittlement ofthelowalloysteelscurrently usedforlightwater!cooledreactorvessels.IIIAppendixGof10CFRPart.50providesthefracturetoughness requirements for"'reactor pressure':vessels undercertainconditions.
ToensurethattheAppendixG'limitsare,notexceededduringanyanticipated operational occurrence, technical specification pressure-temperature limitsareprovidedduringlowtemperature operations.
Theembrittlement algorithm specified byrevision2ofRegulatory Guide1.99ismoreconservative thanrevision1,and!'requires thattheselimitsbere-calculated.
ITheLowTemperature Overpressure Protection System(LTOPS)providesprotection againstexceeding thevesselductility limits,asexpressed bytheAppendixGpressure-temperature limits,duringcoldshutdown, heatup,andcooldownIoperations.'he,'limits resulting from.implementation ofthanewrevisiontos!Regulatory Guide1.99,requiresthattheLTOPSsetpoints bere-eva'lusted.
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REFERENCE DOCUMENTS FORTHECALCULATION TOSUPPORTTHEUNIT1LTOPSETPOINTCHANGE EI-n'~t'II%uaegwlA4\'gIOIftg1' AMERICANELKCTRlCPOWEROateSubjectJanuary4,1990COOKNUCLEARPLANTLowTemperaeure Overpxessuxe Proeeccion SyseemSeepointEvaluaeion ReportFromToP.G.SchoepfR.C.CarruthAeeached, foryouruse,isanapprovedcopyoftheVeseinghouse Repore,."D.C..Cook(Unit2)LowTemperacuxe Overpressure Proeeccion Syseem(LTOPS)'"Seepoint"Evaluation."
ThisreportprovidesaCookPlanespecificapplication oftheVeseinghouse Owner'sGroupmethodology forLTOPSseepoint'.determination, including asensitivity studyonPORVopeningtime.Althoughthereporteitleindicates "Unit2",theevaluaeion wasintentionally performed using.,the mostconservative ofUnie1andUnit2planeparameters.
Therefoxe, themethodology described maybeappliedto,eitherunie's'isoehermal heaeup/cooldown cuxvestocalculaee=that unit'sLTOPsetpoine.
Thisreportshouldbeusedeocalculate futureLTOPSseepoints basedontheresultsofreactorvesselmaterialsurveillance programcapsuleanalyses.
Pleasenoeethae.thisxeporeprovidesjustification to.reeainthecurrentUnie2LTOPSsetpoine(T/Svalue)of43Spsig(provided FORVstxokeopentimesremainbelow6.Sseconds)whentheheaeup/cooldown cuxvesdeveloped perRegulaeory Guide1.99,Rev.2areinstieueed.
Thesenewcurvesweresubmieeed totheNRCviaAEP:NRC:0894L, andarescheduled forimplemeneaeion duringthe1990Unit2refueling outage.Aecachment cc:R.L.D.R.J.D.T.R.T.P.J.R.Shobexg/File:
AEP:NRC:0894L HafexGrierSaeyan-Shaxma Beilman-BxidgmanSampson/T.
R.Stephens-BridgmanInta4yrrcm 4ICa-Si,P;