ML17250A540

Responds to NRC 800811 Request for Info Re Generic Review of Degraded Grid Voltage.All low-voltage,125-volt Ac Class IE Buses Are Supplied from Either Uninterruptable Power Source or Regulated 480/125-volt Transformers

ML17250A540
Person / Time
Site:	Ginna
Issue date:	09/03/1980
From:	WHITE L D ROCHESTER GAS & ELECTRIC CORP.
To:	CRUTCHFIELD D Office of Nuclear Reactor Regulation
References
TASK-08-01.A, TASK-8-1.A, TASK-RR NUDOCS 8009090513
Download: ML17250A540 (4)

Text

REGULATORYr"ORMATIONDISTRIBUTIONSYS"M(RIDS)ACCESSIONNBR:8009090513DOC~DATE:80/09/03NOTARIZED:NO'.DOCKETFACIL:50-244RobertEmmetGinnaNuclearPlantPUnitiiRochesterG05000244AUTHINANEAUTHORAFFIL'IATIONHHITEEL.D~RochesterGasLElectricCorp.RECIP~iVAMERECIPIENTAFFILIATIONCRUTCHFIELDPD~OperatingReactorsBranch5

SUBJECT:

RespondstoNRC800811requestforinfo.regenericreviewofdegradedgrid,voltage.Alllow-voltagegi25voltacClassIEbusesaresuppliedfromeitheruniterruptablepowersoUrceorregulated480/125-volttransformers'ISTRIBUTIONCODE:ADIBSCOPIESRECEIYED:LiTRg'NCLQSIZEITITLE:OnsiteEmergencyPowerSystemsNOTES:1copy:SEPSect.Ldr.05000244RECIPIENTIDCODE/NAMEACTION:CRUTCHF-IELD04INTERNAL:AEODISCSYSBR09MPA18OELD17ORBR12GFILE01COPIESLfl'TRENL7RECIPIENTIDCODE/NAME'ENISSUESBR13ILE06NRCPDR02OPEXEVALlBR11,POHERSYSBR14COPIESLTTRENCL'XTERNAL:ACRSNSIC1605161LPDR03~EF'etgaooTOTALNUMBEROPCOPIESREQUIRED:LTTRPfENCL;gj/

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-~///IIIIIII/l/IIII/I/IIIIIII.>'igjjeIIIIIIIII5;'IIII//8/I/I/I///IIIIROCHESTERGASANDELECTRICCORPORATIONo89EASTAVENUE,ROCHESTER,N,Y.14649LEOND.WHITE,JR.VICEPRESIOCNTTCI.CPHONCARCACOOC7ld546-2700September3,1980OfficeofNuclearReactorRegulationAttention:Mr.Dennis.M.Crutchfield,ChiefOperatingReactorsBranchNo.5U.S.NuclearRegulatoryCommissionWashington,D.C.20555

Subject:

DegradedGridVoltage,GenericReview

DearMr.Crutchfield:

InresponsetoyourAugust11,1980requestforadditionalinformationthefollowingisprovidedforyouruseincompletingyourgenericstudy.Alllow-volta'ge,125volt,ACClassIEbusesat.GinnaStationaresuppliedfromeitheranuninterruptablepowersource(UPS)orfromregulated480/125volttransformers.Thusthese125VIEbusesarenotsusceptibletovariationsinoffsitesourcevoltagelevels.InthiswaythereguirementsofGDC-13aremet.Theinstrumentationand/orcontrolssuppliedbytheseIEbuseswillperformovertheiranticipatedrangesduringtheoffsitevoltagerangesestablishedinourDecember6,1979report.Forthisreason,the125voltClassbusseswerenotmodeledintheGinnainteractiveloadflowprogramandnocalculationswereperformedonthissystem.Sincerely,L.D.Whie,Jr.POI55/oSI909OSSPLJ t\t'I