ML19257C592
| ML19257C592 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 01/21/1980 |
| From: | Clayton F ALABAMA POWER CO. |
| To: | |
| References | |
| NUDOCS 8001290457 | |
| Download: ML19257C592 (1) | |
Text
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Alabama Power Company 600 North 18th Street Post Office Box 2641 Dirmingham, Alabama 35291 Telephone 205 323-5341
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hko?'v^7e' r%@nt AlabamaPower trenurmn w:n. :,w m January 21, 1980 Mr. J. '. O'Reilly, Director U. S. Nuclear Regulatory Commission 101 Marietta Street, N.W.
Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
RE:
J. M. Farley Nuclear Plant Special Report Technical Specification 6.9.2 Docket No. 50-348 This special report is being submitted as required by Technical Speci-fication Section 6.9.2 (ECCS Actuation).
At 1427 on 10/24/79, while the plant was in Mode 4, the "'A' Train SI (Safety Injection) Plocked" light went off and a SI actuated on
'A' Train.
The Shift Foreman verified that plant parameters did not warrant a SI and terminated the SI in accordance with FNP-1-AOP-4.0, Recovery frcm a Spurious Safety Injection.
An investigation was initiated which produced three possible f ailure mechanisms which could account for the SI.
Troubleshooting of the possible failure mechanisms reucaled that all circuits and components worked accord-ing to design.
Since the exact cause of the spurious SI could not be deter-mined, the most suspect element in the chain was replaced, P/0 Universal Card A416. A logic test was performed on the ' A' Train and it was returned to service at 1432 on 10/25/79.
The maximum number of occurrences of actuation of Safety Injection considered in the Westinghouse design transient analyses is fifty (50).
There have been a total of seven (7) inadvertent Safety Injections (in all modes) to date.
Three (3) of these Safety Injections were actuated while in Modes 1, 2, or 3 (average reactor coolant temperature above 350 F).
Sincerely yours, 1
f f' lav IorC y b
F. L. Clayton,l Jr.
FLCJr/TNE:bhj
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