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

AECDISTRIBUTIONFORPART50DOCKETMATERIALTEMPORARYFORMFROM'iagaraMohawkPowerCorpoSyracuse~N.Y.13202FJ.SchneiderDATEOFDOC:tion8<<1-72DATEREC'D8.-42LTRFIiRMORPTTo:Mr.SkovholtORIGCC('ENTAECPDR~SENTLOCALPDRCLASS:UPROPINFODEIPTION:Ltrreportinganincidenton7-27-72~regardinganincreasingrecirculationsystva5Wpackingleakagewithinthedrywell."NoCYSREC'DENCLOSURES:DOCKETNo:0220PLANTNAMES:NineMble00NOTREMOVEII%NO'RFtIHFoaACTIONINFORMATION-2ABBUTLERLW/CopiesCLARK(L)W/CopiesGOLLER(L)W/CopiesKNIELLW/CopiesSCHWENCER(L)W/CopiesSTOLZ(L)W/CopiesVASSALLOLW/CopiesH.DENTONW/CopiesSCHEMEL(L)W/-=-Copies-ZIEMANNLW/9CopiesCHITtAtOOD(FM)W/CopiesDICKER(ENVIRO)--=--=--W/-=CopiesKNIGHTONENVIROW/CopiesW/CopiesW/CopiesiNTERNALDISTRXBUTIONGHAECPDRVOGCpROOMP-506AWNi&i'TZING/STAr(('ASEGIAl4BUSSO~BOYD-L(Btla)DEYOUNG-L(PWR)~SKOVHOLT-LP.COLLINSREGOPR.SPILEIhREGIOH(2)~ioRRISvSTEELETECHREVIEW+HENDRXEg/SCHROEDER~MACCARYLANGEPAWLICKX,SHAOVKNUTHv'TELLOiMOORE~THOMPSON>TEDESCOvLONG~LAINASBENAROYAlrVOLL14ER~ENTON(4)GRXMESGAMMXLLKASTNERBALIJQU)FINEEHVIROMOLL?RDICKERKNIGHTONYOUNGBIOOD'ROJL'CTLEADERHARLESSPSMSMILEXNUSSBAUMERLICASST.SERVICEMASONWIISONKARISMITHGEARINDXGGSTEETSWADESHAFERBROWNJAPIHDBRAITMANSALTZMANPIAHSMODOHALDDUDEC~MILES~1-'LOCALPDROsweoNY~l-mIE(LAUGHL-.NVl<<NSIC(BUCHANAN)1-ASLB-Yoaz/SAYREWOODWARD/HEST.~16CYSACRSHOLDINGEXTERNALDXSTBIBUTXON(X(5)(9)-NATIONALLAB>sANL/ORNL/PNL1-R.CARROLL-OC~GTB3271>>R.CATLIN)A-170-GT1CONSULANT'SNEWMARK/BLUAA/AGABIAN1-PDR-SAN/LA/NY,1-GERALDLELLUCHEBROOKHAVENNAT.LAB1BOLANDpIDAHOFALLS~IDAHO(50>>331Only)l-aD..mrzza..F-3o9GT F~~(~'\-*~~~o~IP('i c;.'t"'05~0E-.~>~IN'tuG<>gal~9~IJUITORy.,f~~ambjRegtitafory',.FfteCy-..NIAGARA~ŽMOHAWK300ERIE8OUIEVARDWESTSYRACUSE,H.Y.IS202NIAGARAMOHAWKPOWERCORPORATIONAugust1,1972Mr.DonaldJ.SkovholtAssistantDirectorforReactorOperationsDivisionofReactorLicensingUnitedStatesAtomicEnergyCommissionWashington,D.C.205458

DearMr.Skovholt:

Re:ProvisionalOperatingLicense:DPR-17DocketNo.:50-220AppendixA(TechnicalSpecifications3.3.1aand3.3.1b)ofProvisionalOperatingLicenseDPR-17forNineMilePointNuclearStation,UnitOlstates:3.3.1a"Aftercompletionofthestartuptestprogramanddemonstrationofplantelectricaloutput,theprimarycontainmentatmosphereshallbereducedtolessthanfivepercentoxygenwithnitrogengaswheneverthereactorcoolantpressureisgreaterthan110psigandthereactorisinthepoweroperatingcondition,exceptas.specifiedin"b"below."3.3.1b"Withinthe24hourperiodsubsequenttoincreaseofthereactorcoolantpressureabove110psigwheneverthereactorisinthepower.operatingconditj.on,thecontainmentatmosphereoxygenconcentrationshallbereducedtolessthanfivepercentbyweightandmaintainedinthiscon-dition.Deinertingwascommenced24hourspriortoamajorrefuelingoutageorotherscheduledshutdown."AnorderlyshutdownofUnit81,NineMilePointNuclearStationwasbegunonJuly27,1972duetoincreasingrecirculationsystemvalvepackingleakagewithinthedrywell.Followingrepackingoftheaffectedvalves,theunitwasrestartedonJuly30,1972andreached110psigat0700thatday.

)~~~~I4I4~~

Mx.DonaldJ.Skovho1tUnitedStatesAtomicEnergyCommission0Page2AnagreementhadbeenmadepriortoshutdownwithNationalCylinderGas,anitrogengassupplierinConshohocken,Pa.fordeliveryoftwotrucksofnitrogenonJuly30,1972.Normalinertingrequires4-6hoursandcouldeasilybeaccomplishedthatday,wellwithintherequired24hours.However,unknowntostationpersonnel,thegassupplierwashavingdifficultyinobtainingdriversforthenecessarytwotrucksofnitrogen.ThestartupoftheUnitbeyond110psigcontinued,basedupontheprioragreementthatnitrogenwouldbearrivingforinertingthatday.Atmidnight,July30,1972withnonitrogenforinertingonsite,itwasdeemednecessarybystationpersonneltoholdthermalpowerto1200MN(t)andnotcontinuewiththenormalscheduledstartupuntilthedrywellwasinerted.ThefirsttruckofnitrogenarrivedatthestationthemorningofJuly31,1972andinertingbeganimmediately.Thedrywellatmospherewasreducedtolessthanfivepercentoxygenat134Sthatday,reaching3.9percentat1400.Thestartupscheduledthencontinued.Thedrywellatmosphereremainedwithinspecificationfollowinginertingandwiththearrivalofthesecondtrucklateintheevening,July31,1972wasreducedtoitspresentlevelofonepercentbyweightofoxygen.Verytrulyyours,F.J.Schn'eiderVicePresidenteOperations 1tllJt