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

REGULATORY r"ORMATION DISTRIBUTION SYS"M(RIDS)ACCESSION NBR:8009090513 DOC~DATE:80/09/03NOTARIZED:

NO'.DOCKETFACIL:50-244 RobertEmmetGinnaNuclearPlantPUnitiiRochester G05000244AUTHINANEAUTHORAFFIL'IATION HHITEEL.D~Rochester GasLElectricCorp.RECIP~iVAMERECIPIENT AFFILIATION CRUTCHFIELDPD

~Operating ReactorsBranch5

SUBJECT:

RespondstoNRC800811requestforinfo.regenericreviewofdegradedgrid,voltage.All low-voltagegi25 voltacClassIEbusesaresuppliedfromeitheruniterruptable powersoUrceorregulated 480/125-volt transformers'ISTRIBUTION CODE:ADIBSCOPIESRECEIYED:LiTR g'NCLQSIZEITITLE:OnsiteEmergencyPowerSystemsNOTES:1copy:SEPSect.Ldr.05000244RECIPIENT IDCODE/NAME ACTION:CRUTCHF-IELD 04INTERNAL:

AEODISCSYSBR09MPA18OELD17ORBR12GFILE01COPIESLfl'TRENL7RECIPIENT IDCODE/NAME'EN ISSUESBR13ILE06NRCPDR02OPEXEVALlBR11,POHERSYSBR14COPIESLTTRENCL'XTERNAL:

ACRSNSIC1605161LPDR03~EF'etgaooTOTALNUMBEROPCOPIESREQUIRED:

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/I/I/I///IIII ROCHESTER GASANDELECTRICCORPORATION o89EASTAVENUE,ROCHESTER, N,Y.14649LEOND.WHITE,JR.VICEPRESIOCNT TCI.CPHONC ARCACOOC7ld546-2700September 3,1980OfficeofNuclearReactorRegulation Attention:

Mr.Dennis.M.

Crutchfield, ChiefOperating ReactorsBranchNo.5U.S.NuclearRegulatory Commission Washington, D.C.20555

Subject:

DegradedGridVoltage,GenericReview

DearMr.Crutchfield:

InresponsetoyourAugust11,1980requestforadditional information thefollowing isprovidedforyouruseincompleting yourgenericstudy.Alllow-volta'ge, 125volt,ACClassIEbusesat.GinnaStationaresuppliedfromeitheranuninterruptable powersource(UPS)orfromregulated 480/125volttransformers.

Thusthese125VIEbusesarenotsusceptible tovariations inoffsitesourcevoltagelevels.Inthiswaythereguirements ofGDC-13aremet.Theinstrumentation and/orcontrolssuppliedbytheseIEbuseswillperformovertheiranticipated rangesduringtheoffsitevoltagerangesestablished inourDecember6,1979report.Forthisreason,the125voltClassbusseswerenotmodeledintheGinnainteractive loadflowprogramandnocalculations wereperformed onthissystem.Sincerely, L.D.Whie,Jr.POI55/oSI909OSSPLJ t\t'I