ML20235B176
| ML20235B176 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 07/02/1987 |
| From: | Andrews R OMAHA PUBLIC POWER DISTRICT |
| To: | Bournia A Office of Nuclear Reactor Regulation |
| References | |
| LIC-87-474, NUDOCS 8707080662 | |
| Download: ML20235B176 (2) | |
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i Omaha Public Power District 1623 Harney Omaha, Nebraska 68102 402/536 4000 July 2, 1987 LIC-87-474 Mr. A. Bournia, NRC Project Manager Project Directorate IV Division of Reactor Projects III, IV, & V and Special Projects U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Reverences:
1.
Docket No. 50-285 2.
Letter to NRC (A. Bournia) from 0 PPD (R. L. Andrews) dated June 22, 1987 (LIC-87-427)
Dear Mr. Bournia:
SUBJECT:
Additional Information to Support the Auxiliary Feedwater System Reliability Review The Omaha Public Power District recently provided your office information (with the exception of 2 items) to support the upcoming NRC visit on Auxiliary Feedwater System reliability.
The information relative to the two remaining items (Reference 2, Attachment 8, items 5 and 6) is hereby forwarded for your consideration.
If you have any questions, please do not hesitate to contact us.
Sincerely, GL k &ns,%
R. L. Andrews Division Manager Nuclear Production RLA/me cc: LeBoeuf, Lamb, Leiby & MacRae w/o Enclosure J. E. Gagliardo, Chief, Reactor Projects Branch, Region IV w/o Enclosure P. H. Harrell, NRC Senior Resident Inspector w/o Enclosure 8707080662 870702 g 'k PDR ADOCK 05000285 g
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il ENCLOSURE 5.
History of the number of loss of main feedwater events and loss of offsite power events for each year of operation Resoonse: - A Loss of Offsite Power (LOOP) event is defined as a simultaneous loss of the 345 KV feed and the 161 KV feed into the station.
There has been only one recorded LOOP event at the Fort Calhoun Station.
This event occurred August 22, 1977 when the incoming 161 KV line tripped and the fast transfer failed to perform as designed resulting in a momentary loss of power to station loads. This event was reported in LER 77-021 In addition to the one LOOP event, there have been three other times when all offsite power was unavailable.
In all three cases, the plant was in a refueling outage and either the 161KV or 345KV feed was out for maintenance and the other incoming feeder was lost (twice due to personnel error and the third time due to a fault in a station transformer.)
These events were reported in LER's87-008 and 87-009, and Abnormal Occurrence Report No.75-007.
There have been no total loss of main feedwater events at the Fort Calhoun Station.
6.
History of the number of unplanned automatic scrams for each year of l
operation.
Response
NUMBER OF UNPLANNED YEAR TRIPS 1973 2
1974 3
1975 1
1976 4
1977 3
1978 1
1979 2
1980 2
1981 5
1982 3
1983 0
1984 1
1985 0
1986 1
1987 (YTD) 0 i
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