ML20052E220

RO 82-011:on 820427,both Channels on Control Room Airborne Radiation Monitor Found Inoperable.Caused by Failure to Maintain Emergency Mode for Air Cleanup Sys During 820313 Preventive Maint

ML20052E220
Person / Time
Site:	San Onofre
Issue date:	04/28/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
RO-82-011, RO-82-11, NUDOCS 8205100207
Download: ML20052E220 (2)

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P.ECEIVED i:E Southern California Edison Company S AN ONOFRE NUCLE AR GENER ATING ST A TION up yg. 3yf5 P .O. B O X 12 9

$ AN C LEMENT E. C A LIFORNI A 92672 h((Q

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U. S. Nuclear Regulatory Commission U N '

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Office of Inspection and Enforcement Region V E 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 g //

Attention: Mr. R. H. Engelken, Regional Administrator Docket No. 50-361 Licensee Event Report 82-011 San Onofre, Unit 2

Dear Sir:

This letter describes a Technical Specification reportable occurrence involving inoperable Engineered Safety Feature Actuation System (ESFAS) instrumentation at San Onofre Unit 2.

Technical Specification 3.3.2.b and Action 13 to Table 3.3-3 requires the Control Room Emergency Air Cleanup System to be maintained in the emergency mode of operation within one hour of the time that both channels of the Control Room Airborne Radiation Monitor are made or discovered to be inoperable. On March 13, 1982, the single operable channel of the monitor was taken out of service for preventive maintenance. Operation of the air cleanup system in the emergency mode was not maintained for the full three hours in which the monitor was out of service; however, both trains of the air cleanup system were operable in the event that manual initiation was required.

Discovery of the reporting omission was made durf ag an internal review of recent operating incidents. This incident was discussed with the Unit 2 Resident Inspector on April 27, 1982, immediately following the evaluation of the event -eporting status.

Preparation of a written report and Unit 2 Licensee Event Report 82-011 is being expedited.

Sincerely, 8205100207 820429 g[fbp PDR ADOCK 05000361 S ppy

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cc: U. .S. Nuclear Regulatory Consnission Office of Inspection and Enforcement U. S. Nuclear Regulatory Connission Office of Management Information and Program Control (MPIC)

Institute of Nuclear Power Operations (INP0) ,

A. E. Chaffee - (USNRC Resident Inspector - San Onofre, Unit 2) 1 i

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