ML19242C502

LER 79-034/03L-0 on 790703:following Surveillance Flow Test, Core Spray Loop a Test Valve MO2-14-26A Failed to Fully Close.Caused by backed-out & Distorted Valve Seat Ring.Pipe Hanger Repaired.Valve Repair Delayed Pending Unit Outage

ML19242C502
Person / Time
Site:	Peach Bottom
Issue date:	08/02/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-79-034-03L, LER-79-34-3L, NUDOCS 7908100492
Download: ML19242C502 (1)

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S Mr. ..yi. H. Gr ie r , Directu '

'-79-34/3L Mr. .4 o pe t t i ...n b Enforse ,;nt, s eq i r .,

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This L.E.R. refers to MD 2-14-26A Core Spray Ten Loop Isolation valve failing in mid-position. Applicable Tech. S pe c s .

are 3. 5.F.1 and 3.5. A.2.

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U S NUCLE AR REGUt A Trav FY 'S.M LICENSEE EVENT REPORT

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i e r . -s <:u,e. c i i _Following a successful surveillance flow test, the core spray loop A twsC m

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L_ , . i test valve SO2-14-26A failed to fully close. At same tiwe E-4 die sel seas r- -' out of service for governor modification. Core spray loop A was declared ri, La _ inoperable and an orderly shutdown initiated in accord with tech. spec.

I~t. j ; 3.5.F.2. Diesel was made operable in about 2 hrs. and plant was returned _ . _ _

c -- . to full power as permitted by tech spec. 3.3. A.2. Unit was shutdown for

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L _c u. t _ i.. valve repair on 7-6-79

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Valve seat ring was found backed '5ut and distorted. Excessive vibration

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t .t suspected due to broken pipe hanger. Pipe hanger repaired. Valve repair

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j-- delayed pending parts availability and unit outage. Blank flange was L_._,t ' __ installed upstream of SO2-14-26A to restore loop operability. Loop

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operability verified by observing zero flow with inject. ton valve closed.

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