05000361/LER-1982-113, Forwards LER 82-113/03L-0.Detailed Event Analysis Submitted

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Forwards LER 82-113/03L-0.Detailed Event Analysis Submitted
ML20069J807
Person / Time
Site: San Onofre Southern California Edison icon.png
Issue date: 10/15/1982
From: Ray H
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20069J810 List:
References
NUDOCS 8210250269
Download: ML20069J807 (2)


LER-2082-113, Forwards LER 82-113/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
3612082113R00 - NRC Website

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[Mi s.ma Southern California Edison Copy ~ p y S AN ONOFRE NUCLE A R GENER ATINd $TA TION h5 P.O. Box 120 S AN CLEMENTE. C ALIFORNI A 92672 I' ~

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October 15, 1982 i

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 "

g Walnut Creek, California 94596-5368 ,

Attention: Mr. R. H. Engelken, Regional Administrator i

Dear Sir:

Subject:

Docket No. 50-361 30-Day Report I Licensee Event Report No.82-113 l

San Onofre Nuclear Generating Station, Unit 2 l

This submittal is in accordance with the reporting requirements of Section 6.9.1.13d of Appendix A to Facility Operating License NPF-10.
It describes a reportable occurrence 'avolving Limiting Condition for Operation (LCO) 3.11.2.4 associated with the Gaseous Radwaste Treatment j

System. A completed copy of LER 82-113 is enclosed.

While in Mode 3, on September 16, 1982, routine operator inspection during gaseous waste processing of gas surge tank T082 revealed that the

interstage rupture disc of waste gas compressor C010 was breached.

Waste gas processing was halted and the compressor immediately isolated.

Since standby waste gas compressor C011 was out-of-service for maintenance, the Gaseous Radwaste Treatment System was declared inoperable at 0735.

t Though repairs were completed and the system was restored to operable status in less than 31 days as permitted by LCO 3.11.2.4 Action Statement a, the event seas considered an abnormal degradation of a

system designed to contain radioactive material resulting from the fission process.
Subsequent investigation revealed that tha. rupture disc failure was j attributable to excess buildup of interstage pressure within the compressor.

. The rupture disc was replaced and the system returned to operable status at 1120 on September 17, 1982.

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R. H. Engelken - October 15, 1982 An engineering evaluation is currently being performed to investigate this problem. Based on this evaluation, possible design modifications will be made as warranted.

. i There was no significant impact on plant operations or the health and safety of plant personnel or the public as a result of this occurrence, since emergency actions including local evacuation in accordance'with Station Procedure S023-3-5.39 were inititated immediately_after discovery of the breached disc and the projected gaseous effluent doses within the i radwaste building were significantly below those of the applicable LCO.

If there are any questions regarding the above, please contact me.

Sincerely, H6 /5Yuw 4 i

cc: U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement ,

l U. S. Nuclear Regulatory Commission j Of fice of Management information & Program Control 4

l Institute of Nuclear Power Operations I

A. E. Chaf fee (USNRC Resident inspector, San Onofre Unit 2) i l

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