05000361/LER-1982-043, Forwards LER 82-043/03L-0.Detailed Event Analysis Submitted

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Forwards LER 82-043/03L-0.Detailed Event Analysis Submitted
ML20058J251
Person / Time
Site: San Onofre Southern California Edison icon.png
Issue date: 08/02/1982
From: Ray H
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20058J255 List:
References
NUDOCS 8208090211
Download: ML20058J251 (2)


LER-2082-043, Forwards LER 82-043/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
3612082043R00 - NRC Website

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Southern California Eo'ison Company S AN ONOFRE NUCLE AR GENER A TING S T A TlON QC '

P .O. B O X 128 5 AN C L EMEN TE. C ALIFORNI A 92672 *-=

H. B. R A Y TELEPHONE "a" N-ANAo'"

August 2, 1982 " " " " - " "

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 S ir:

Subject:

Docket No. 50-361 30-day Report Licensee Event Report No.82-043 San Onofre Nuclear Generating Station, Unit 2 Pursuant to Appendix A Technical Specification 6.9.1.13b to Operating License NPF-10, for San Onof re Unit 2, this submittal provides the required 30-day written report of an occurrence involving operation in a degraded modo associated with Limiting Condition for Operation (LCO) 3.7.5.

On July 8, 1982, while operating in Mode 4, Train A of the Control Room Emergency Air Cleanup System was declared inoperable due to failure of the Emergency Chiiled Water Pump P-160 to start on demand. Investigation revealed that the one amp fuse installed in the pump starting circuit had blown. The fuse was replaced, however, repeated attempts to start the pump resulted in continued blown fuses.

The condition was documented in a nonconformance report S023-P-501 and subsecuent investigation by engineering revealed an error in fuse size specification on the circuit wiring diagram. Measurement of applicable starting and running curr>nts on both pumps P-160 and P-162 indicated a two amp fuse was appropriate. Two amp fuses were installed and FieId Change Requests (FCR's) U4352 and U4353 were initlated to revise the wiring diagram to reflect this as built condition. Train A was restored to operable status on July 12, 1982 within the 7 days permitted by the applicable Action Statement associated with LCO 3.7.5.

820ZO90211 820802 PDR ADOCK 05000361 S PDR (( -) C1

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Mr. R. H. Engelken August 2, 1982 l 1

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Though problems such as this drawing error may be expected as part of l the initial start-up of a complex system, the number of occurrences l affecting the operability of the Control Room Emergency Air Cleanup System has indicated the need for increased management attention in this ,

area. We are, therefore, establishing a special task force to further  !

investigate each event, evaluate tne reliability of instrumentation, actuation, controls and all equipment supporting proper operation of this Engineered Safety Feature system.

l A completed Licensee Event Report form sunmarizing this event is enclosed. '

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

Sincerely, 4

Enclosure:

LER No.82-043 cc: A. E. Chaffee, USNRC Resident inspector, San Onofre Unit 2 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