05000206/LER-1981-029, Forwards LER 81-029/03L-0.Detailed Event Analysis Submitted

Forwards LER 81-029/03L-0.Detailed Event Analysis Submitted

ML20039D367
Person / Time
Site:	San Onofre
Issue date:	12/17/1981
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20039D368	List: 05000206/LER-1981-029, Forwards LER 81-029/03L-0.Detailed Event Analysis Submitted 05000206/LER-1981-029-03, /03L-0:on 811119,diesel 1 Failed to Start.Caused by Overspeed Trip Due to Low Governor Oil Level.Adequate Oil Level Not re-established Prior to Returning Diesel to Svc. Station Procedures Being Revised
References
NUDOCS 8201040021
Download: ML20039D367 (2)

LER-1981-029, Forwards LER 81-029/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
2061981029R00 - NRC Website

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Southern California Edison Company WE S AN ONOPRE NUCLE AR GENER ATING S TA TION p.O. B O E 320 S A N C LEMEN T E. C A LIFOR Nia 92972 H. 8. R A Y YELare*oNa ST ATION M AN AGE A (Floy 493 7 700 December 17, 1981 to d'

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U.

S. Nuclear Regulatory Commission nECEWED

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Office of Inspection and Enforcement J A 4, gy. 4 )

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1450 Maria Lane, Suite 210 g

Walnut Creek, California 94596-5368 g

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DOCKET No. 50-206 SAN ONOFRE - UNIT 1 Attention:

R.

H. Engelken

Dear Mr. Engelken:

This letter describes a reportable occurrence involving loss of onsite back-up AC power generation capacity.

Submittal is in accordance with the reporting requirements of Section 6.9.2.b of Appendix A to Provisional Operating License DPR-13.

On November 19, 1981, with Diesel Generator No. 2 secured for annual preventive maintenance, Diesel Generator No. 1 failed to start, tripping on overspeed.

Maintenance activity was immediately halted on No. 2 Diesel and the Unit returned to service.

Diesel Generator No. 2 was started and placed on line well within the two hour limit imposed by Technical Specification 3.7.

Investigation revealed that the reason for the failure of Diesel No. 1 to s.mrt was low governor oil level, which resulted following preventive maintenance.

No evidence was found of oil leakage from the governor.

As described in a letter from the manufacturer dated September 1, 1981, installation of the governor oil cooler is such that E3 the true level can only be determined with the engine runningc~

Although it was planned to relocate the cooler to permit m ER verification of correct oil level with the engine stopped 3 R

our procedures had not been corrected to reflect the intesim S3 Ess measure of checking oil level with the engine running.

This

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has now been corrected.

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0201040021 811217-PDR ADOCK 05000204

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t R. H. Engelken <

Diesel No. 1 was returned to service within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> limit of Technical Specification 3.7.

If you have any questions,-or desire-further information on 4

this. matter, please contact me.

Very truly yours, i

Enclosure:

Licensee Event Report.81-029 4

cc:

U.

S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S.

Nuclear Regulatory Commission-Office of Management Information & Program Control (MIPC) 4 i -

Institute'of Nuclear Power Operations (INPO)

L.. F. Miller (USNRC San-Onofre Unit 1 Resident Inspector) 2 i

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