ML19210E800
| ML19210E800 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/27/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7912130005 | |
| Download: ML19210E800 (3) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION E
WASHINGTON, D. C. 20555
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Novenber 27, 1979
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Docket No. 50-336 Mr. W. G. Counsil, Vice President Nuclear Engineering & Operations Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
RE: f11LLSTONE NUCLEAR POWER' STATION, UNIT NO. 2 We are currently reviewing the adequacy of the offsite power systems of nuclear power plants and in particular, the loss of offsite power events at your facility. One aspect of this review concerns the history of experienced total and partial power outages and attendent degraded voltage or frequency conditions of the grid.
In our review of this matter, we have drawn upon the information provided to us via Licensee Event Reports and followup letters which have been sent to us. Our records do not indicate that you have experienced any loss of offsite power events either completely or partially.
Please review your experiences and, if any are identified, then report them in answer to this letter and furnish the related information as included in the enclosure.
Please provide your response for the Millstone, Unit No. 2 to us within 90 days of the receipt of this letter.
Sincerely.
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Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
Request for Additional 1548 316 Information cc:
w/encicsure See next page 7912130 O O 6
~
Northeast Nuclear Energy Company cc:
William H. Cuddy, Esquire Day, Serry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 06385 Northeast Nuclear Energy Company ATTil:
Superintendent itillstone Plant Post Office Box 128 llaterford, Connecticut 06'385 Northeast Utilities Service Company ATTN:
Mr. James R. Himmelwright Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Anthony Z. Roisman, Esq.
Natural Resources Defense Council 917 15th Street, N.W.
Washingtcn, D.C.
20005 Mr. John T. Shediosky Nuclear Regulatory Commission, Region I Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406 1548 317
Enciess-e
- 055 0F 0FFSITE POWE; SURVEY
- For losses cf effsite power where less than all o" site ::..er was lost:'
l.
Ho #. rany circuits to the offsite network are r.:rmally available and he,; many were lost during the event?
2.
What was the cause of the event?
3.
Why did the other lines not fail when some did fail?
4 Was any voltage increase or decrease experienced just prior to or during the outag,e-?
If so, please give dstails,.oltages reached, affects, etc.
5.
Was ar, frequency decay experienced just prior to or d; ring the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.
How long was power unavailable from the circuit?
7.
Date of event.
B.
For losses of all offsite power:
1.
How long was the power off? How long for car ial recteery?
Please give details.
2.
If turbine trip occurred, how soon after did loss of offsite power occur?
3.
If power was recovered promptly (10 minutes or less), was it due to automatic or manual actions?
4.
Was any voltage increase or decrease experienced just prior to or during the outage?
If so, please give detials, voltages reached, affects, etc.
5.
Was any frequency decay experienced just prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
5.
Cate c# event.
1548 313
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