ML17250A540
| 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 Ginna Nuclear Pl ant P Unit ii Rochester G
05000244 AUTH INANE AUTHOR AFFIL'IATION HHITEE L. D ~
Rochester Gas L Electric Corp.
REC IP ~ iVAME RECIPIENT AFFILIATION CRUTCHFIELDPD ~
Operating Reactors Branch 5
SUBJECT:
Responds to NRC 800811 request for info. re generic review of degraded grid,voltage.All low-voltagegi25 volt ac Class IE buses are supplied from either uniterruptable power soUrce or regulated 480/125-volt transformers'ISTRIBUTION CODE:
A DIBS COPIES RECEIYED:LiTR g'NCL Q SIZE I TITLE: Onsi te Emer gency Power Systems NOTES:1 copy:SEP Sect.
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05000244 RECIPIENT ID CODE/NAME ACTION:
CRUTCHF-IELD 04 INTERNAL: AEOD ISC SYS BR 09 MPA 18 OELD 17 OR BR 12 G FILE 01 COPIES Lfl'TR EN L
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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.
VICE PRESIOCNT TCI.CPHONC 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/o SI909OSS PL J
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