ML20095H850
| ML20095H850 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 04/23/1992 |
| From: | Gates W OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LIC-92-095R, LIC-92-95R, NUDOCS 9204300299 | |
| Download: ML20095H850 (7) | |
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Omaha, Nebraska 681n2 2247 402/636-2000 April 23, 1992 LIC-92-095R U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station Pl-137 Washington, DC 20555
References:
1.
Docket No. 50-285 2.
Letter from OPPD (W. G. Cates) to NRC (Document Control Desk}
dated November 11, 1991 (LIC-91-305R)
Gentlemen:
SUBJECT:
Losses of 161 kV System Since March 1989 During a discussion of Reference 2 (application to amend the operating license concerning 161 kV restrictions), Mr. Frank Ashe of the NRC technical staff asked if information existed to demonstrate the reliability of the 161 kV power source and the fast transfer function for Fort Calhoun Station.
Omaha Public Power District (OPPD) suggested, and Mr. Ashe aareed to. OPPD researching the issue for the preceding three years.
OPPD has determineo that three forced outages for the 161 kV power source have occurred since March 1989 for Fort Calhoun station. After each forced outage, a successful fast transfer of the 161 kV power source occurred. Attachment A is the requested information that demonstrates ieliability of the 161 kV power source and the fast transfer function. Attachment B is copies of the Fort Calhoun Station Control Room Log for the days in question.
If you should have any questions, please contact me.
Sincerely AO N. /Y W. G. Gates Division Manager Nuclear Operations WGG/sel c:
LeBoeuf, Lamb, Leiby & MacRae D. L. Wigginton, NRC Senior Project Manager S. D. Bloom, NRC Project Engineer R. D. Martin, NRC Regional Administrator, Region IV R. P. Mullikin, NRC Senior Resident Inspector 9204300299 92C C3 PDR ADOCK 05000285 P
PDR A Q t'l /
r.O '
45-5124 Empeyment utn Eaual oppatun ry
//
Mee/ Female
s Attachment A LIC-92-095R Page 1 FORCED OUTAGES OF THE _161 kV SYSTEM FROK_ MARCH.1989 TO PRESFNT At this time, there is one 161 kV circuit feeding Fort Calhoun Station (FC.S).
That circuit (1588) is fed from Substation 1226. There are two 161 kV circuits which feed Substation 1226.
Neither of these two circuits have experienced a forced outage since 1982.
Additionally, a reliability study was conducted in March 1989.
The study concluded that the from 1973 through Harch 1989, the reliability of Circuit 1588 was 99.8%.
1.
DATE:
March 4, 1989 STATUS:
Unit at mode 1.
T, - 540.8',
7 EVENT:
1:ault on 161 kV Circuit 1588 connecting Substation 1226 to the Fort Calhoun Station Switchyard.
This fault occurred during a winter storm when the transmission line suffered the loss of several structures.
FAST TRANSFER:
Successful.
Safeguards buses 1A3 and 1A4-successfully fast transferred to the 345 kV power feed.
EFFECT:
No unit trip occurred.
161 kV OUTAGE DURATION:
6 Days, 7 Hours, 10 Minutes ADDITIONAL INF0: The fault on the 161 kV line occurred during a sncd\\ ice stonn with winds greater than 30 c..ph.
CLASSIFICATION:
Category: Operational Specific:
Line Material Failure 2.
DATE:
June 20, 1991 STATUS:
Unit at Mode 1.
T, - 540.5* F.
EVENT:
Lost due to trip of Breaker 111. Lockout relay 86/T1A-4 tripped and locked out.
FAST TRANSFER:
Successful. Safeguards buses lA3 and 1A4 successfully fast transferred to the 345 kV power feed.
EFFECT:
No unit trip occurred.
161 kV OUTAGE CURATION:
2 Hours, 43 Minutes ADDITIONAL INF0:
Investigation revealed that the Transformer T1A4 Lockout Relay (86/TIA-4) tripped due to a spurious oil pressure relay operation.
System Operations reset the pressure rel ay. The 86/TIA-4 relay was reset and the plant was returned to a normal electrical line up.
CLASSIFICATION:
Category: Equipment Related Specific: Accidental Tripping (relaying)
Attachment A LIC-92-095R Page 2 3.
DATE:
November 30, 1991 STATUS:
Unit at Mode 1.
T, - 54 0' F.
EVENT:
A broken insulator that was to be repaired is believed to have caused a
fault of the 161 kV system approximately 15 minutes prior to a scheduled outage.
See additional information below.
FAST TRANSFER:
Successful.
Safeguards buses lA3 and 1A4 succe;sfully fast transferred to the 345 kV power fend.
EFFECT:
N? nuit trip occurred.
161 kV OUTAGE DURATION:
7 Hours, 36 Minutes.
ADDITIONAL INFO: The equipment failure (broken insulator) is believed to have been caused by a snow and ice storm the previous day. The insulator was repaired during the outage.
CLASSIFICATION:
Category.
Equipment Related Specific: Line Material Failure r
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