As much as 120 tons of radioactive water may have leaked from a storage tank at Japan's crippled Fukushima nuclear plant, contaminating the surrounding ground, Tokyo Electric Power Co said on Saturday.
The power company has yet to discover the cause of the leak, detected on one of seven tanks that store water used to cool the plants reactors, a spokesman for the company, Masayuki Ono, said at a press briefing.
The company plans to pump 13,000 cubic meters of water remaining in the tank to other vessels over the next two weeks.
The facility was the site of the worst nuclear disaster since Chernobyl in March 2011 when a magnitude 9.0 earthquake triggered a tsunami that destroyed back-up generators and disabled its cooling system. Three of the reactors melted down.
The storage tanks, pits excavated at the site in the wake of the disaster, are lined with water proof sheets meant to keep the contaminated water from leaking into the soil
Work to decommission the plant is projected to take decades to complete.