ML20009D602

Updated LER 81-006/01X-1:on 810123,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: ML20009D599 ML20009D602
References
LER-81-006-01X, LER-81-6-1X, NUDOCS 8107240210
Download: ML20009D602 (3)

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1ol11 F S SG 61 ooCKET NV 8ER o8 69 EVENT oATE 74 75 REPCRT oATE do EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h t o [2] l During Unit 2' refueling outage, LLRT performed on the feedwater check valves measured I f5oT f1 l through leakage in excess of that allowed by Tech. Spec. 4.7.A for: (1) a single l i

,,o,,,l penetration (29.38 SCFH), (2) total penetration and isolation valve leakage (176.29 l gj ; SCFH) and (3) total containment leakage (783 SCFH). This was of minimal safety l

,ag,l significance since the feedwater line is capable of being isolated by a motor _

o ;7 g l operated valve upstream of the check valves. Similar event

50-237/80-06. l foTTl I 80 l

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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 _j gl deemed necessary. l l

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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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81 -7 PART 1 l TITLE OF EVENT OCCURRED 1-23-81 1000 Exceeding Tech. Spec. Limitation For LLRT DATE T itiE REASON FOR SUPPLEttEllTAL REPORT Update cause of failure and corrective action

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PART 2 l ACCEPTAtlCE BY STAT 1ON REVIEU dd 8uo Idu DATE 7- /0 -2/ 7//3b}

SUPPLEttENTAL REPC'!T APPROVED NID AUTil0RIZED FOR D1STRIBUTI011

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