Tepco confirms oil leakage at Japan's Fukushima nuclear plant 31 May 2011 The Tokyo Electric Power Co. (Tepco), which operates the troubled Fukushima nuclear plant, on Tuesday announced that the facility's reactors have been leaking oil into the sea. At about 8:00 a.m. local time Tepco workers noticed oil floating on the sea during a patrol. The oil stain is around 200 to 300 meters long and leaked from the curtain wall of the water intake canal of reactors 5 and 6 at the Fukushima Daiichi nuclear power plant.