ML20080B458
| ML20080B458 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/15/1983 |
| From: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8308050507 | |
| Download: ML20080B458 (2) | |
Text
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'ED Southern California Edison Company 1:33,7,,,
ST S AN ONOFRE NUC LE AR GENER A TING ST A TION i/
P.O. B O X 126 S A N C L EME N T E. C A LIFOR NI A 92672 July 15, 1983 m ai m " a Star o~ u A~ Aaa.
U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lanc, Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. J. B. Martin, Regional Administrator
Dear Sir:
Subject:
Docket No. 50-362 Prompt Report Licensee Event Report No.83-046 San Onofre Nuclear Generating Station, Unit 3 Pursuant to Section 6.9.1.12.b of Appendix A, Technical Specifications to Facility Operating License NPF-15 for San Onofre Unit 3, this letter provides the prompt notification and written confirmation of a reportable occurrence involving the emergency Diesel Generators.
During swing shift on July 13, 1983, with the Unit in Mode 4, a valve alignment was implemented to transfer fuel from the Diesel Fuel Storage Tank, T-036 for emergency Diesel Generator 3G003 to the Diesel Fuel Storage Tank, T-035 for emergency Diesel Generator 3G002.
Contrary to Limiting Condition for Operation (LCO) 3.8.1.1.b of the Technical Specifications, this alignment isolated the normal supply from the respective fuel transfer pumps to each of the day fuel tanks by closure of valves MU-075 and MU-076.
The improper closure of valves MU-075 and MU-076 was initially recognized at 1015 on July 14, 1983, by review of abnormal valve v.
alignment records in the Control Room on the following day shift.
A cooldown to Mode 5 was initiated immediately, pursuant a
to LCO 3.0.3 while the records were confirmed.
Both emergency diesel generators were declared inoperable due to this incorrect valve alignment and an Unusual Event was declared at about 1100.
The valves were aligned correctly at 1110 ending the Unusual Event, and required notifications were immediately initiated.
1 8308050507 830715
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PDR ADOCK 05000362 S
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.h Mr. J. B. Martin July 15, 1983 Investigation of the event has determined that the swing shift
.ontrol Operator for the Units 2 and 3 common position developed and documented the abnormal valve alignment to perform the fuel transfer as directed by his foreman.
However, he failed to obtain a review and approval of this alignment and of the change in the position of locked valves by a Senior Reactor Operator, y
as required by procedure.
The fuel transfer was not completed on the following graveyard shift, and it was turned over for accomplishment to the day shift on July 14, 1983, when the error in valve adlignment was recognized and corrected.
Unit 3 remained in Mode 4 throughout the event.
Corrective action to prevent recurrence of this event will be described in our 14-day follow-up report and Licensee Event Report (LER) No.83-046 to be submitted prior to July 29, 1983.
It will include additional training for all operating personnel concerning use of administrative control for locked valves and abnormal valve line-ups.
If there are any questions, please contact me.
Sincerely, cc:
A.
E.
Chaffee (USNRC Resident Inspector, Units 2 and 3)
J. P. Stewart (USNRC Resident Inspector, Units 2 and 3) i, s
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