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 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: 80/09/03 NOTARIZED: NO '. DOCKET FACIL:50-244 Robert Emmet

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Ginna Nuclear Pl ant AFFIL'IATION P Unit ii Rochester G 05000244 AUTH INANE AUTHOR HHI TEE L. D ~ Rochester Gas L Electric Corp.

REC IP ~ iVAME RECIPIENT AFFILIATION CRUTCHFIELDPD ~ Operating Reactors Branch 5

SUBJECT:

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/I/I/I///IIII ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N,Y. 14649 LEON D. WHITE, JR. TCI.CPHONC VICE PRESIOCNT ARCA COOC 7ld 546-2700 September 3, 1980 Office of Nuclear Reactor Regulation Attention: Mr. Dennis.M. Crutchfield, Chief Operating Reactors Branch No. 5 U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Degraded Grid Voltage, Generic Review

Dear Mr. Crutchfield:

In response to your August 11, 1980 request for additional information the following is provided for your use in completing your generic study.

All low-volta'ge, 125 volt, AC Class IE buses at. Ginna Station are supplied from either an uninterruptable power source (UPS) or from regulated 480/125 volt transformers. Thus these 125V IE buses are not susceptible to variations in offsite source voltage levels. In this way the reguirements of GDC-13 are met. The instrumentation and/or controls supplied by these IE buses will perform over their anticipated ranges during the offsite voltage ranges established in our December 6, 1979 report. For this reason, the 125 volt Class busses were not modeled in the Ginna interactive load flow program and no calculations were performed on this system.

Sincerely, L. D. Whi e, Jr.

POI5 5

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