ML19323F224

LER 80-011/03L-0:on 800418,check Valves Upstream of Accumulators Had Excessive Back Leakage.Caused by BUNA-N Seat Embrittlement Due to Age.Check Valve Seats Replaced W/Ethylene Propylene Matl.Valves Bench Tested

ML19323F224
Person / Time
Site:	Cooper
Issue date:	05/12/1980
From:	Converse W NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19323F221	List: ML19323F220 ML19323F224
References
LER-80-011-03L, LER-80-11-3L, NUDOCS 8005280671
Download: ML19323F224 (1)

Text

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REPCRT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l o 12 I Fhile performing SP 6.2.2.2.6 to check operability of ADS accumulators. 3 of 6 checkl Ioi3l l valves upstream of the accumulators were found to have excessive back leakage. (T.S.l l o 141 0 5.E.1) At the time the failed valves were discovered. the slant uns shnednun fnv l l o I s l refueling and maintenance. ADS has never been innearnbla hacnn=a in=*rn-ane n4v / Tail IaisI has always been avatinhie. nneriaa nierngan m h o r t.,, n g,,7 ply *,, T a meg nien nu,41_ l 10 ! 71 bble. There were no sienf fienne necurranca= ne a vaante nf *h4= oven

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Iilol The 6 valves (DRAGON, Model C12057R with BUNA-N seats) were removed from the system l lilil for inspection and repair. The seats were embrittled allowine excessive back lonk- 1 I i i > I bge. Ethylene propylene 0-rings were installed and the valves returned to service. I lil11 IS.P. 6. 2. 2. 2. 6 vas nerformed successfn11v. I li14 1I I a 3 80 5t$175  % POWER OTHER STATUS DIS O RY DISCOVERY DESCRIPTION W lH l @ b 10 10 l@l NA I IB l@l Surveillance Testing i A TIVITY CO TENT RELCASEO OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE NA l 1 NA  !

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