ML20077B710
| ML20077B710 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/11/1983 |
| From: | Morgan H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-83-043, RO-83-43, NUDOCS 8307250394 | |
| Download: ML20077B710 (2) | |
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RECEIVED inic Southern California Edison Company, SCE S AN ONOFRE NUCLE AR GENER ATING S T A TlON P.O. SOK 126 S A N C LEMEN T E. C A LIFOR NI A 92672 ST AflON M AN AGE A (714)492-7700 July 11, 1983 U.S. Nuclear Ragulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. J.
B. Martin, Regional Administrator Daar Sir:
Subject:
Docket No. 50-362 Prompt Report Licensee Event Report 83-043 San Onofre Nuclear Generating Station, Unit 3 Pursuant to Saction 6.9.1.12.b of Appendix A, Technical Specifications tc Provisional Operating License NPF-15 for San Onofr e Unit 3, this submittal provides the written confirmation of our prompt notification to the NRC on July 8, 1983, of a reportable occurrence involving the D.C. power sources On July 8, 1983, while Unit 3 was in Mode 4 Train B Emergency Chiller E-335 was declared inoperable.
Loss of a chiller renders all equipment inoperable in rooms in both units where chilled water is provided to cool atbient air.
Several Limiting Condition for Operations (LCO's) govern plant operation in this situation.
Tha most restrictive LCO for a loss of the ch111er is LCO 3.8.2.1.
The loss of Train B Emergency Chiller renders two battery chargars inoperable.
Since LCO 3.8.2.1 requires all four battery banks and their associated battery chargers to be i
operable in Modes 1 thru 4 and since the associated Action Statement only addressas loss of one such bank and its associated battery charger LCO 3.0.3 was invoked at 1350.
The chiller was declared operaole at 1422 and LCO 3.0.3 was exited.
A 14-day follow-up report and Licensee Event Report (LER) No.83-043 will be submitted prior to July 25, 1983, to address this event.
8307250394 830711 i
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Mr.. J.B. Mar tin
_2-July 11, 1983 If there are any questions regarding the above, please contact me.
Sincerely, h$
C cc:
A. E. Chaffee (USNRC Resident Inspector, Units 2 and 3)
J. P. Stewart (USNRC Resident Inspector, Units 2 and 3) 4 d
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