ML19254D073
| ML19254D073 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/01/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Dunn C DUQUESNE LIGHT CO. |
| References | |
| TAC-13110, NUDOCS 7910220324 | |
| Download: ML19254D073 (3) | |
Text
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UNITED STATES
[ND r(, j NUCLEAR REGULATORY COMMISSION
" J \\ W /,. E WASHINGTON, D. C. 20555 S Ni4[f[
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GCT 1 BIS Docket No. 50-334 Mr. C. N. Dunn, Vice President Operations Division Duquesne Light Company
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435 Sixth Avenue Pittsburgh, Pennsylvania 15219
Dear Mr. Dunn:
RE: BEAVER VALLEY POWER STATION, UNIT NO. 1 We are currently rev fewing the adequacy of the offsite power systems of nucl far power plants and in particular, the loss of offsite power events at your facil ity. One aspect of this review concerns the history of experienced total and partial power outages and attendant degraded voltage or frequency conditions of the grid.
In our review of this matter we are drawing upon the information you provided in Licensee Event Reports (LERs) and followup letters to the NRC.
Our review of a number of these LERs indicates that loss of offsite power has occurred at your facility on May 11, 1977, November 17, 1977 and July 28, 1978.
In order to complete our review of loss of offsite power events we require response to the enclosed request for infomation.
We request that you provide your response within 90 days of the receipt of this letter.
Si ncerely,
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(8/.lW&
A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
Request for *nformation cc: w/ enclosure See next page 1194 089 2T 79 220 P
Mr. C. N. Dunn Duquesne Light' Company cc: Gerald Charnoff, Esquire Mr. Janes A. Werling Jay E. Silberg, Esquire Plant Superintendent Shaw, Pittman, Potts and Trowbridge Beaver Valley Power Station 1800 M Street, N.W.
P. O. Box 4 Washington, D. C.
20036 Shippingport, Pennsylvania 15077 Karin Carter, Esquire M'r. John A. Levin Special Assistant Attorney General Public Utility Commission Bureau of Administrative Enforcement P. C. Box 3265 5th Ficor, Executive House Harrisburg, Pennsylvania 17120 Harrisburg, Pennsylvania 17120 Mr. Roger Tapan Stone and Webster Engineering Corporation P. O. Box 2325 Boston, Massachusetts 02107 o,
Mr. J. D. Woodward R & D Center Westinghouse Electric Corporation Building 7-303 Pittsburgh, Pennsylvania 15230 B. F. Jones "emorial Library 663 Franklin Avenue Aliquippa, Pennsylvania 15001 Mr. Jack Carey Technical Assistant Duquesne Light Ccapany P. O. Box 4 Shippingport, Pennsylvania 15077 Mr. R. E. Martin Duquesne Light Conpany 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Marvin Fein Utility Counsel City of Pittsburgh 313 City-County Building Pittsburgh, Pennsylvania 15219 iI94 09C
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ATTACHMENT A.
For losses of offsite power where less than all offsite pcwer 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 ' ail?
Was any voltage increase or decrease experier.'id just prior to or during 4.
the outage? "If so, please give details, voltr.ges 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.
3.
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 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.
Cate of Event.
C.
Were there any other loss of offsite power events other than we have listed?
If so, please give details of each event.
TI94 091