ML20009E870
| ML20009E870 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/23/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-08-03.B, TASK-RR LSO5-81-07-075, NUDOCS 8107280501 | |
| Download: ML20009E870 (3) | |
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July 23, 1981 Docket No. 50-245 LS05 07-075 e
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Mr. W. G. Counsil Vice President 9-Nuclear Engineering and Operations 1 JUL 2 71981 *
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Northeast Nuclear Energy Company P. O. Box 270 5
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Dear Mr. Counsil:
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SUBJECT:
SEP TOPIC VIII-3.B. DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION, SAFETY EVALUATION FOR MILLSTONE 1 The enclosed staff safety evaluation is based on a contractor's document that has been made available to you previously. This document supports
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the findings of the staff safety evaluation of Topic VIII-3.B and reconinends i
modifications to the de systems.
The need to actually implement these change:: will be determined during the integrated safety assessment. This safety evaluation may be revised in the future if your facility design is changed or if NRC criteria relating to this topic are modified before the integrated assessment is completed.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing
Enclosure:
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Mr. W. G. Counsil cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN: Assistant Director Counselors at Law Research and Policy One Constitution Plaza Developaent Hartford, Connecticut 06103 Department of Planning and Energy Policy Natural Resources Defense Council 20 Grand Street 91715th Street, N. W.
Hartford, Connecticut 06106 Washington, D. C.
20005 Northeast Nuclear Energy Conpany ATTN: Superintendent Millstone Plant P. O. Box 128 Waterford, Connecticut 06385 Mr. Janes R. Himmelwright Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Resident Inspector c/o U. S. NRC P. O. Box Drawer KK Niantic, Connecticut 06357 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka Systens Superintendent Northeast Utilities Service fos pany P. O. Box 270 Hartford, Connecticut 06101 U. S. Environmental Protection Agency Region I Office ATTN: EIS C0ORDINATOR JFK Federal Building Boston, Massachusetts 02203 l
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TOPIC: VIII-3.B. DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION 1.
INTRODUCTION To assure the design adequacy of the de power system battery and bus voltage monitoring and annunciation schemes such that the operator can (1) prevent the loss of an emergency de bus; or (2) take timely cor*ective action in the event of loss of an emergency de bus, we reviewed the dc power system battery, battery charger, and bus voltage monitoring and annunciation design with respect to de power system operability status indication to the operator.
II. REVIEW CRITERIA The review criteria are presented in Section 2 of EG&G Report 0140J, "DC Power System Bus Voltage Monitoring and Annunciation."
III. RELATED SAFETY TOPICS AND INTERFACEl None IV., REVIEW GUIDELINES None V.
EVALUATION As noted in EG&G Report 0140J the Millstone 1 control room has no indica-tion of battery current, battery charger current, de bus voltage, or breaker / fuse status.
Therefore, the de power system monitoring is not in compliance with current licensing criteria.
VI. CONCLUSION The staff proposes that as a minimum, the following indications and alarms of the Class 1E de power system (s) status should be provided in the control room.
Battery current (ammeter-charge / discharge)
Battery charger output current (ammeter)
DC bus voltage (voltmeter)
DC bus ground alarm (for ungrounded system)
Battery breaker (s) or fuse (s) open alarm Battery charger output breaker (s) or fusa(s) open alarm