05000237/LER-1981-006-01, Excessive Leakage Indicated Various Penetrations in Feedwater Check Valves. Caused by Cracked O Ring & Worn Swing Pins.Valves Repaired & Broken Components Replaced

Excessive Leakage Indicated Various Penetrations in Feedwater Check Valves. Caused by Cracked O Ring & Worn Swing Pins.Valves Repaired & Broken Components Replaced

ML20009D602
Person / Time
Site:	Dresden
Issue date:	06/06/1981
From:	Zirwas K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D600	List: 05000237/LER-1981-006, Forwards Updated LER 81-006/01X-1 05000237/LER-1981-006-01, Excessive Leakage Indicated Various Penetrations in Feedwater Check Valves. Caused by Cracked O Ring & Worn Swing Pins.Valves Repaired & Broken Components Replaced
References
LER-81-006-01X, LER-81-6-1X, NUDOCS 8107240210
Download: ML20009D602 (3)

LER-1981-006, Excessive Leakage Indicated Various Penetrations in Feedwater Check Valves. Caused by Cracked O Ring & Worn Swing Pins.Valves Repaired & Broken Components Replaced

Event date:
Report date:
2371981006R01 - NRC Website

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CAUSE CESCRIPTION AND CORRECTIVE ACTIONS @

lilol l The cause of *be failure was a cracked "0" 'line on the 2-220-62A valve and worn swine I gi pins on the 2.-220-58 A & B valve. The valves were repaired and broken components re-I gl placed. The valves were tested satisfactorily after repairs. No further action

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ATTACHMENT TO IlCENSEE EVENT REPORT 81-06/OlX-1 COM110NWEALTH EDISON COMPANY (CNE)

DRESDEN JNIT 2 (ILDRS-2)

DOCKET # 050-237

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During Unit 2 refueling outage, LI;RT performed on the feedwater check valves measured leakages in excess of that alleved by:

(1) a single penetration (29.38 SCFH), (2) total penetration and isolation valve leakage (176.29 SCFH) and (3) total containment leakage ;

/83 SCFH, per Tech Spec 4.7.A.

This was of minimal safety, significance since the feedwater line is capable of being isolated by a mocor operated valve upstream of the check valves.

Similar event:

50-237/80-06.

The cas.se of the failure was a etacked "0" ring on the 2-220-62A valve and worn swing pins on the 2-220--58 A & B valves. The valves were repaired and broken components replaced. The valves were tested satisfactorily after repairs.

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