ML19259B434

LER 79-004/03L-0 on 790111:LPCI Sys Full Flow Test Valve MO-2-1501-38B Failed While Securing D LPCI Pump.Caused by Broken Pinion Gear on Valve Operator Motor Shaft

ML19259B434
Person / Time
Site:	Dresden
Issue date:	01/24/1979
From:	COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A584	List: ML17173A582 ML19259B434
References
LER-79-004-03L, LER-79-4-3L, NUDOCS 7902090344
Download: ML19259B434 (1)

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' d 60 61 EVENT DESCRIPTICfJ AND DROBAsLE CONSECUE*4CESl h Mo-2-1501-38B failed to j Fo12:

l During steady operation the LPCI system full flow test va ve The valve ]

down the torus.

"D" LPCI pump after pumping

a i3 j [ operate while securing the The breaker did not trip while]

p ia[} opened but could not be closed from the control room. Safety j Valve was manually closed and taken out of service.

3 ,3] ; operating the. valve. he line Could be Closed to prevCSt j

[0 l6 l l Significance was miniflal since a seCond Valve in t

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[aj7); flow. This is the first failure of this valve.

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d 53 C C'J P. VAJ/E oee I SUSCCOE SUSCOOE CAUSE CAUSE CCVPONENT CCDE SYSTE?.1 SUSCOOE CCOE is l Fj@ LE_jh [B_j h lV l A lL [V l0 lP }h Wh d h CCDE ZJ

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EF:ECT SFUTOC'/IN NCURS 22 SUS *.HTIED F OR?.t s L 3.

LL 12 i o ( 470 jg ACTION 71/TU9 E TA<!N ACTICN oN FLM.T . E D OO V

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{The cause of the f ailure was a broken pinion l d three gear times on fromthe v j The pinion gear was replaced and the valve was successfully cyc e j

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No further corrective action is phnned.

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