ML17250A828

Suppls 801031 Submittal Re Environ Qualification of Electrical Equipments. Possible Effects of Motor Driven Auxiliary Feedwater Pumps Failure Due to High Energy Line Break on Class IE Sys Provided

ML17250A828
Person / Time
Site:	Ginna
Issue date:	12/15/1980
From:	MAIER J E ROCHESTER GAS & ELECTRIC CORP.
To:	CRUTCHFIELD D Office of Nuclear Reactor Regulation
References
TASK-03-12, TASK-3-12, TASK-RR NUDOCS 8012220341
Download: ML17250A828 (6)

Text

REGULATORYORMATIONDISTRIBUTIONSYSM(RIDS)ACCESSIONABR:80122203<iiDOC~DATE:80/12/15NOTARIZED:NODOCKETFACIL:50"244RobertEmmetGinnaNuclearPlantrUnitliRochesterG05000200AUTH.NAMEAUTHORAFFILIATIONMAIERgJ~E>RochesterGas8ElectricCorp.RECIP~NAMERECIPIENTAFFILIATIONCRUTCHFIELDgD~OperatingReactorsBranch5

SUBJECT:

Suppls801031submittalre"EnvironQualificationofElectricalEquipments~"PossibleeffectsofmotordrivenauxiliaryfeedwaterpumpsfailureduetohighenergylinebreakonClass1Esysprovided.DISTRIBUTIONCODE:A035SCOPIESRECEIVED:LTRENCLSIZE:/TITLE:SEPTopicsNOTES:1copy:SEPSect,Ldr.05000204RECIPIENTIDCODE/NAh1EACTION:CRUTCHFIELDOgCOPIESLTTRENCLRECIPIENTIDCODE/NAMECOPIESLTTRENCLINTERNAL:A/DMATLLQUAL13HYD/GEOBR1002GFILE011211CONTSYSA071ILE062ORASSESSBR111SEPBR123EXTERNAL:ACRSNSIC10051611LPDR031DEC2gtgegTOTALNUMBEROFCOPIESREQUIRED:LTTR~ENCL I'IllfF'IIlf,ffftlIItfgIIIlIIIlf.lffCs.off rI/I/I/////I///ANDIlflllgll//////////I885K2///l///l///l/ROCHESTERGASANDJOHNE.MAIERVICEPRESIDENT4+LCPHONCc<5ot7ia546-2700C4~p)GARCACkP19gb~C,')~C&4~a)~(hn~I&December15,ELECTRICCORPORATIONS9EASTAVENUE,ROCHESTER,N.Y.14649I"~e"Cl~I4DirectorofNuclearReactorRegulationAttention:Mr.DennisM.Crutchfield,ChiefOperatingReactorsBranchN5U.S.NuclearRegulatoryCommissionWashington,D.C.20555

Subject:

SEPTopicIII-12,EnvironmentalQualificationofElectricalEquipmentR.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Crutchfield:

RochesterGasandElectrichasreviewedthepossibleeffectsofafailureofthemotor-drivenauxiliaryfeedwaterpumps,duetothepostulatedoccurrenceofahighenergylinebreakintheIntermediateBuilding,ontheClass1Eelectricalsystems,asdiscussedbelow.ThisinformationsupplementsinformationprovidedinparagraphIV-11ofRG6E'sOctober31,1980submittalconcerning"EnvironmentalQualificationofElectricalEquipment".Thepowerfeedercablesforthemotordrivenauxiliaryfeedwaterpumpsareroutedfrommotorcontrolcenters(MCC's)14and16,locatedonseparatefloorsoftheAuxiliaryBuilding,tothesepumps.ThecurrentflowineachfeedercircuitiscontrolledbyaDB-50circuitbreaker,locatedattheMCC's,withovercurrentsettingsmatchedtothepumpcharacteristicsandtheboltedfaultmagnitudeforthefeedercircuit.Anyfaultsgeneratedbyapumpfailurewillbeclearedbythesebreakers.Asinglefailureofabreakerwillaffectonlyoneofthetwosafety-related"trains".SincethebreakersandMCC'sarelocatedintheAuxiliaryBuilding,andwouldthereforenotbesubjecttotheharshhighenergylinebreakenvironment,theyarenotsubjecttoacommonmodefailure.Controlcircuitsforthe-pumpsareroutedfromtheControlRoomandRelayRoomtotheAuxiliaryBuilding.Thesecircuitsalsohaveovercurrentprotection,andarenotexposedtothehighenergylinebreakenvironment.

CmfI ROCHESTERGASANDELECTRICCORP.December15,1980Mr.DennisM.Crutchfield,ChiefSHEETNO.ItisthereforeconcludedthattheClassIEelectricalsystemswillnotbedegradedbyahighenergylinebreakintheIntermediateBuilding.Verytrulyyours,J.E.MaierJEM:ngcc:JohnArcher,FRC NIIVVv