ML17037C130

Nine Mile Point Unit 1 - Letter Reporting an Orderly Shutdown on July 27, 1972 Due to Increasing Recirculation System Valve Packing Leakage within the Drywell

ML17037C130
Person / Time
Site:	Nine Mile Point
Issue date:	08/01/1972
From:	Schneider F J Niagara Mohawk Power Corp
To:	Skovholt D J US Atomic Energy Commission (AEC)
References
Download: ML17037C130 (6)

Text

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FfteCy-..NIAGARA~ŽMOHAWK300ERIE8OUIEVARDWESTSYRACUSE, H.Y.IS202NIAGARAMOHAWKPOWERCORPORATION August1,1972Mr.DonaldJ.SkovholtAssistant DirectorforReactorOperations DivisionofReactorLicensing UnitedStatesAtomicEnergyCommission Washington, D.C.205458

DearMr.Skovholt:

Re:Provisional Operating License:DPR-17DocketNo.:50-220AppendixA(Technical Specifications 3.3.1aand3.3.1b)ofProvisional Operating LicenseDPR-17forNineMilePointNuclearStation,UnitOlstates:3.3.1a"Aftercompletion ofthestartuptestprogramanddemonstration ofplantelectrical output,theprimarycontainment atmosphere shallbereducedtolessthanfivepercentoxygenwithnitrogengaswheneverthereactorcoolantpressureisgreaterthan110psigandthereactorisinthepoweroperating condition, exceptas.specified in"b"below."3.3.1b"Withinthe24hourperiodsubsequent toincreaseofthereactorcoolantpressureabove110psigwheneverthereactorisinthepower.operating conditj.on, thecontainment atmosphere oxygenconcentration shallbereducedtolessthanfivepercentbyweightandmaintained inthiscon-dition.Deinerting wascommenced 24hourspriortoamajorrefueling outageorotherscheduled shutdown."

AnorderlyshutdownofUnit81,NineMilePointNuclearStationwasbegunonJuly27,1972duetoincreasing recirculation systemvalvepackingleakagewithinthedrywell.Following repacking oftheaffectedvalves,theunitwasrestarted onJuly30,1972andreached110psigat0700thatday.

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Mx.DonaldJ.Skovho1tUnitedStatesAtomicEnergyCommission 0Page2Anagreement hadbeenmadepriortoshutdownwithNationalCylinderGas,anitrogengassupplierinConshohocken, Pa.fordeliveryoftwotrucksofnitrogenonJuly30,1972.Normalinertingrequires4-6hoursandcouldeasilybeaccomplished thatday,wellwithintherequired24hours.However,unknowntostationpersonnel, thegassupplierwashavingdifficulty inobtaining driversforthenecessary twotrucksofnitrogen.

ThestartupoftheUnitbeyond110psigcontinued, basedupontheprioragreement thatnitrogenwouldbearrivingforinertingthatday.Atmidnight, July30,1972withnonitrogenforinertingonsite,itwasdeemednecessary bystationpersonnel toholdthermalpowerto1200MN(t)andnotcontinuewiththenormalscheduled startupuntilthedrywellwasinerted.ThefirsttruckofnitrogenarrivedatthestationthemorningofJuly31,1972andinertingbeganimmediately.

Thedrywellatmosphere wasreducedtolessthanfivepercentoxygenat134Sthatday,reaching3.9percentat1400.Thestartupscheduled thencontinued.

Thedrywellatmosphere remainedwithinspecification following inertingandwiththearrivalofthesecondtrucklateintheevening,July31,1972wasreducedtoitspresentlevelofonepercentbyweightofoxygen.Verytrulyyours,F.J.Schn'eider VicePresident eOperations 1tllJt