05000361/LER-1983-012, Forwards LER 83-012/03L-0.Detailed Event Analysis Submitted

Forwards LER 83-012/03L-0.Detailed Event Analysis Submitted

ML20070W013
Person / Time
Site:	San Onofre
Issue date:	02/08/1983
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20070W015	List: 05000361/LER-1983-012, Forwards LER 83-012/03L-0.Detailed Event Analysis Submitted 05000361/LER-1983-012-03, /03L-0:on 830108,emergency Chiller E-336 Failed to Start & Declared Inoperable.Caused by Faulty Program Timer.Timer Replaced
References
NUDOCS 8302180231
Download: ML20070W013 (2)

LER-1983-012, Forwards LER 83-012/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611983012R00 - NRC Website

text

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S AN ONOFRE NUC LE AR GENER ATING ST A TION

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P.O. BO X 128 S AN C LEMENTE. C ALIFORNI A 92672 f.

m "~o~5 H. B. R AY February 8,1983 ST ATION M AN AGE R (71414,2 7700 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:

Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject:

Docket Nos. 50-361 and 50-362 30-Day Report Licensee Event Report No.83-012 (Docket No. 50-361)

San Onofre Nuclear Generating Station, Units 2 and 3 Pursuant to Section 6.9.1.13.b of Appendix A Technical Specifications to Facility Operating Licenses NPF-10 and NPF-15 for San Onofre Units 2 and 3, respectively, this submittal provides t'.e required 30-day written report and a copy of Licensee Event Report (LER) for an occurrence involving the Emergency Chilled Water System. Since this occurrence involves a shared system between Units 2 and 3, in accordance with NUREG 0161, a single LER for Unit 2 (Docket No. 50-361) is enclosed.

On January 8,1982 Units 2 and 3 were in Modes 1 and 4, respectively.

l At 2000, Emergency Chiller E-336 (Train A) failed to start during testing. Accordingly, the chiller was declared inoperable.

Inoperability l

of E-336 renders equipment inoperable in effected rooms in both units where chilled water is provided to cool ambient air in the event of a Toxic Gas Isolation Signal (TGIS), Safety Injection Actuation Signal (SIAS), or loss of offsite power. Several equally restrictive Limiting Conditions for Operation (LCO's) govern Units 2 and 3 operation in this situation.

For example, LC0 3.7.3 (Component Cooling Water System), for both Units can be considered governing, since the Action Statement associated with this LC0 requires restoration of the inoperable equipment within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

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a R. H. Engelken February 8,1983 Subsequent investigation into the cause of this occurrence indicated that the chiller failed to start due to a faulty program timer. This timer sequences the chiller start. The faulty timer was replaced and the chiller and all associated equipment were declared operable at 1500 on January 9,1983. This was an isolated occurrence and no further corrective action is planned. Enclosed LER 83-012 addresses this event.

There was no impact on plant operation or the health and safety of plant personnel or the public as a result of this occurrence, since normal HVAC was operating throughout the event.

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

Sincerely, HS Thy /'TYMw4 Enclosure: LER 83-012 cc:

A. E. Chaffee (USNRC Resident Inspector, San Onofre Units 2 & 3)

R. J. Pate (USNRC Resident Inspector, San Onofre Units 2 & 3)

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management Information & Program Control Institute of Nuclear Power Operations 4

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