ML19253B694

LER 79-005/03L-0:on 790924,rod Block Gaseous Radiation Monitors Were Inoperable When Containment Isolation Valve on Monitor Return Line Failed Closed.Caused by Hole in Operator Diaphragm.Diaphragm Replaced

ML19253B694
Person / Time
Site:	Oconee
Issue date:	10/10/1979
From:	Lewis S DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML16148A259	List: ML16148A258 ML19253B694
References
LER-79-005-03L-02, LER-79-5-3L-2, NUDOCS 7910170247
Download: ML19253B694 (1)

Text

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o.: IThe RB gaseous radiation monitors were rendered inoperable when a containment l

,,,,, isolation valve on the monitors' return line failed closed. The valve was 3.. l repaired and the monitors were returned to service well within the times g 2is fallowed bv Technical Soecifications 3.1.6.8 and 3.6.3. In addition, two 1

, , , ;other means for detecting RCS leakage were available. Therefore, this incident, ser 'was of no sienificance wi th resnett to safe coeration, and the health and I

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iio i The valve failed due to a hole in its operator dic.phraga, which is believed ,

, , , ,to have exceeded its expected service life. The diaphragm was replaced, and ,

. Jhe valve was tested to verify operability. The preventive maintenance pro- ,

pg gram will be revised to review ES valves to identify those with diaphragms

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