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

REGULATORY ORMATIONDISTRIBUTION SYSM(RIDS)ACCESSION ABR:80122203<ii DOC~DATE:80/12/15NOTARIZED:

NODOCKETFACIL:50"244 RobertEmmetGinnaNuclearPlantrUnitliRochester G05000200AUTH.NAMEAUTHORAFFILIATION MAIERgJ~E>Rochester Gas8ElectricCorp.RECIP~NAMERECIPIENT AFFILIATION CRUTCHFIELDgD~Operating ReactorsBranch5

SUBJECT:

Suppls801031submittal re"EnvironQualification ofElectrical Equipments

~"Possibleeffectsofmotordrivenauxiliary feedwater pumpsfailureduetohighenergylinebreakonClass1Esysprovided.

DISTRIBUTION CODE:A035SCOPIESRECEIVED:LTR ENCLSIZE:/TITLE:SEPTopicsNOTES:1copy:SEPSect,Ldr.05000204RECIPIENT IDCODE/NAh1E ACTION:CRUTCHFIELDOgCOPIESLTTRENCLRECIPIENTIDCODE/NAME COPIESLTTRENCLINTERNAL:

A/DMATLLQUAL13 HYD/GEOBR1002GFILE011211CONTSYSA071ILE062ORASSESSBR111SEPBR123EXTERNAL:

ACRSNSIC10051611LPDR031DEC2gtgegTOTALNUMBEROFCOPIESREQUIRED:

LTTR~ENCL I'IllfF'IIlf,ffftlIItfgIIIlIIIlf.lffCs.off rI/I/I/////I///

ANDIlflllgll/

/////////I 885K2///l///l///l/

ROCHESTER GASANDJOHNE.MAIERVICEPRESIDENT 4+LCPHONCc<5ot7ia546-2700C4~p)GARCACkP19gb~C,')~C&4~a)~(hn~I&December15,ELECTRICCORPORATION S9EASTAVENUE,ROCHESTER, N.Y.14649I"~e"Cl~I4DirectorofNuclearReactorRegulation Attention:

Mr.DennisM.Crutchfield, ChiefOperating ReactorsBranchN5U.S.NuclearRegulatory Commission Washington, D.C.20555

Subject:

SEPTopicIII-12,Environmental Qualification ofElectrical Equipment R.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Crutchfield:

Rochester GasandElectrichasreviewedthepossibleeffectsofafailureofthemotor-driven auxiliary feedwater pumps,duetothepostulated occurrence ofahighenergylinebreakintheIntermediate

Building, ontheClass1Eelectrical systems,asdiscussed below.Thisinformation supplements information providedinparagraph IV-11ofRG6E'sOctober31,1980submittal concerning "Environmental Qualification ofElectrical Equipment".

Thepowerfeedercablesforthemotordrivenauxiliary feedwater pumpsareroutedfrommotorcontrolcenters(MCC's)14and16,locatedonseparatefloorsoftheAuxiliary

Building, tothesepumps.Thecurrentflowineachfeedercircuitiscontrolled byaDB-50circuitbreaker,locatedattheMCC's,withovercurrent settingsmatchedtothepumpcharacteristics andtheboltedfaultmagnitude forthefeedercircuit.Anyfaultsgenerated byapumpfailurewillbeclearedbythesebreakers.

Asinglefailureofabreakerwillaffectonlyoneofthetwosafety-related "trains".

SincethebreakersandMCC'sarelocatedintheAuxiliary

Building, andwouldtherefore notbesubjecttotheharshhighenergylinebreakenvironment, theyarenotsubjecttoacommonmodefailure.Controlcircuitsforthe-pumpsareroutedfromtheControlRoomandRelayRoomtotheAuxiliary Building.

Thesecircuitsalsohaveovercurrent protection, andarenotexposedtothehighenergylinebreakenvironment.

CmfI ROCHESTER GASANDELECTRICCORP.December15,1980Mr.DennisM.Crutchfield, ChiefSHEETNO.Itistherefore concluded thattheClassIEelectrical systemswillnotbedegradedbyahighenergylinebreakintheIntermediate Building.

Verytrulyyours,J.E.MaierJEM:ngcc:JohnArcher,FRC NIIVVv