05000361/LER-1982-163, Forwards LER 82-163/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-163/03L-0.Detailed Event Analysis Submitted

ML20028D885
Person / Time
Site:	San Onofre
Issue date:	01/07/1983
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20028D886	List: 05000361/LER-1982-163, Forwards LER 82-163/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-163-03, /03L-0:on 821208,during Mode 1, Auxiliary Feedwater Pump 2P-140 Tripped on Overspeed.Caused by Failure of Resistor in Pump Speed Sensor Circuitry. Resistor Replaced
References
NUDOCS 8301200063
Download: ML20028D885 (2)

LER-1982-163, Forwards LER 82-163/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982163R00 - NRC Website

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S AN C LEMEN T E. C A LIF ORNI A 92672 H. B. R AY TELEPHONE ST AT:ON M AN AG E R (7143 4,2 7700 January 7,1983 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 No. 50-361 30-Day Report ~

Licensee Event Report No.82-163 San Onofre Nuclear Generating Station, Unit 2 Pursuant to Section 6.9.1.13.b of Appendix A Technical Specifications to Facility Operating License NPF-10 for San Onofre Unit 2, this submittal provides the required 30-day written report and copy of Licensee Event Report (LER) for an occurrence involving the Auxiliary Feedwater (AFW) system.

On December 8,1982, at 1400 while in Mode 1, testing of steam driven AFW pump 2P-140 was in progress when the pump tripped on overspeed and was declared inoperable. Accordingly, Action Statement 'a' of Limiting Condition for Operation (LC0) 3.7.1.2 was entered.

This LC0 requires that while in Mode 1, 2, and 3, at least three independent AFW pumps and associated flow-paths shall be operable.

If one train becomes inoperable, operation may continue provided the inoperable train is restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

The pump tripped due to a failed resistor in the pump speed sensor circuitry. Subsequent investigation revealed that the resistor failure was due to overheating. The resistor was replaced, the pump tested satisfactorily, and declared operable at 1930.

This was an isolated incident, therefore, no additional corrective action to prevent recur-rence is planned.

8801200063 3 IE-w 62-487

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d-Mr. R. H. Engelken January 7,1983 The public health and safety were not affected by this event since any 1

one of the two remaining AFW operable pumps (each able to provide 100%

of required capacity) would have performed the necessary decay heat removal function, if required.

If there are any qsestions, please contact me.

Sincerely, f br Enclosure: LER 82-163 cc:

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

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

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Office of Management Information and Program Control Institute of Nuclear Power Operations (INP0)

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