ML19262A106
| ML19262A106 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 10/01/1979 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7910260358 | |
| Download: ML19262A106 (3) | |
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OCT 1 1979 Docket No. 50-344 Mr. Charles Goodwin, Jr.
Assistant Vice President Portland General Electric Company 121 S. W. Salmon Street Portland, Oregon 97204
Dear Mr. Goodwin:
RE:
TROJAN NUCLEAR PLANT Ue are currently reviewing the adequacy of the offsite power systems of nucirir 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 attendant degraded voltage or frequency conditions of the grid.
In our review of this matter we are drawing upon the infomation 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 April 16, 1976, January 23,1977, April 26, 1977 and October 18, 1977.
In order to complete our review of loss of offsite power events we require response to the enclosed request for information.
We request that you provide your response within 90 days of the receipt of this letter.
Sincerely /
"\\,
(4Y A. $chwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors
Enclosure:
Request for Information cc: w/ enclosure 1217 059 See next page 7 9102 6 0 3 F5'
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Mr. Charles G.codwin, Jr.
Portland General Electric Ccmpany cc: Mr. H. H. Phillips Robert M. Hunt, Chairman Portland General Electric Company Board of County Commissioners 121 S.W. Salmon Street Columbia County Portland, Oregon 97204 St. Helens, Oregon 97051
. Warren Hastings, Esquire Counsel for Portland General Electric Company 121 S.W. Salmon Street Por:1and, Oregon 97204 Mr. Jack W. Lentsch, Manager Generation Licensing and Analysis Portiand General Electric Ccmpany 121 S.W. Salmon Street Portland, Oregon 97204 Columbia County Courthouse Law Library, Circuit Court Roca St. Helens, Oregon 97501 Director, Oregon Department of Energy Labor and Industries Building, Room 111 Salem, Oregon 97310 Richard M. Sandvik, Esquire Counsel for Oregon Energy Facility Siting Counsel and Oregon Department of Energy 500 Pacific Building 520 S.W. Yamhill Portland, Gregon 97204 Michael Malmrose U. S. Nucl ear Regul atory Ccamission Trojan Nuclear P1 ant P. O. Box 0 Rainier, Oregon 97048 Mr. Donald W. Godard, Supervisor Siting and Regulation Oregon Depa-tment of Energy Labor and Industries Building, Room lli Sal em, Oregon 97310
?00R BRIGl\\AL
ATTACHMEilT A.
For losses of offsite power where less than all offsite power was lost:
1.
How many circuits to the offsite network are normally avai1able and how 1
many were lost during the event?
2.
What was the cause of the event?
3.
Why did the other lines not fail when soma. did ' ail?
4 Was any voltage increase or oecrease experier.:ad 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.
5.
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 detail s.
2.
If turbine trip occurred, how soon after di.d loss of off5f L 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.
5.
Date 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.
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