ML19260C674
| ML19260C674 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/13/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 8001080285 | |
| Download: ML19260C674 (3) | |
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DECEl2BER 131979 Docket No. 50-271 Mr. Robert H. Groce Licensing Engineer Yankee Atomic Electric Company 20 Turnpike Road Westboro, Massachusetts 01581
Dear Mr. Groce:
We are currently reviewing the adequacy of the offsite pwer 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 infomation 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 Vemont Yankee Nuclear Power Station to us within 90 days of the receipt of this letter.
Sincerely,
Thomas' Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
Request for Additional Information 1702 292 8001080
Mr. Robert H. Groce Yankee Atomic Electric Company 2-cc:
Ms. J. M. Abbey John R. Stanton, Director Vemont Yankee Nuclear Power Radiation Control Agency Corporation Hazen Drive 77 Grove Street Concord, New Hampshire 03301 Rutland, Vemont 05701 John W. Stevens Mr. Donald E. Vandenburgh, Conservation Society of Vice President Southern Vermont Vemont Yankee Nuclear Power P. O. Box 256 Corporation Townshend, Vermont 05353 Turnpike Road, Route 9
~ Westboro, Massachusetts 01581 Dr. Mars Longley, Director Division Occupational Health John A. Ritsher, Escuire 32 Spaulding Street Ropes & Gray Barre, Vemont 05641 225 Franklin Street Boston, Massachusetts 02110 New England Coalition on Nuclear Pollution Laurie Burt Hill and Dale Fann Assistant Attorney, General West Hill - Faraway Road Environmental Protection Division Putney, Vemont 05346 Attorney General's Office One Ashburton Place, 19th Floor Public Service Board Bosten Massachusetts 02108 State of Vemont 120 State Street Richard E. Ayres, Esquire Montpelier, Vemont 05502 Natural Resources Defense Counsel 91715th Street, N. W.
W. F. Conway, Plant Superintender.t Washington, D. C.
20005 Vemont Yankee Nuclear Power Corporation Honorable M. Jerome Diamond P. O. Box 157 Attorney General Vernon, Vemont 05354 State of Vennont 109 State Street Mr. Charles Sheketoff Pavilion Office Building Assistant Director Montpelier, Yemont 05602 Vemont Public Interest Research Group, Inc.
Anthony Z. Roisman 26 State Street Natural Resources Defense Council Montoelier, Vermont 05502 91715th Street, N. W.
Washington, D. C.
20005 Brooks Memorial Library 224 Main Street Brattleboro, Vermont C5301 1702 293
s REOUEST FOR ADDITIONAL IEFORMATION A.
For losses of offsite power where less than all effsite power was lost:
1.
How many circuits to the offsite network are normally available and how 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 outage?
If so, please give details, 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.
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 partial recovery? 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 ex:erienced just prior to or during the outage?
If so, please give details, voltages reached, affects, etc.
5.
Was any frequency decay experiencec just prior to or during the outage?
If so, please give details, lowest frecuency reached, decay rate, affecus on equipment operation, etc.
6.,
Date of Event.
C.
Were there any other loss of offsite pcwer ever.:s cther than we have listed?
If so, please give details of each evert.
1702 294