05000368/LER-1979-066-03, /03L-0:on 790809,containment Isolation Valve 2CV-2201-2 Would Not Fully Close After Routine Draining of Reactor Drain Tank.Caused by Foreign Matl Damaging Seats & Ball,Resulting in Valve Leaking Through.Valve Cleaned

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• 05000368/LER-1979-066-03, /03X-1:on 790809,following Draining of Reactor Drain Tank,Outside Containment Isolation Valve 2CV-2201-2 Would Not Close.Caused by Foreign Matl Damaging Seats & Balls.Valve Disassembled,Cleaned & Reassembled