05000298/LER-1980-033-03, During Routine Surveillance,Drywell Ventilation Supply Line Inboard Isolation Valve Failed.Caused by Broken Melamine Coated Contact Cam.Cams Replaced by Fibrite Coated Cams

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05000298/LER-1980-033-03, /03L-0:on 800828,during Routine Surveillance Testing,Drywell Supply Inboard Isolation Valve PC-232MV Failed in mid-position.Caused by Broken Operator Contact Cam.Cam Replaced.Damaged Cam Returned to Limitorque

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