Tokyo Electric Power Co. said Wednesday it has found radioactive coolant water leaking from a broken pipe in reactor 4 of the stricken Fukushima No. 1 nuclear plant, but it hasn't flowed outside the building.
The reactor's fuel rods are in the spent-fuel pool, as the reactor was offline for maintenance when the March 11 disaster struck. The leaked coolant water contains radioactive materials from the fuel pool.
According to Tepco, about 8.5 tons of water leaked onto the floor of the reactor 4 building at 10:30 p.m. Tuesday. The leak was stopped 13 minutes later by closing a valve, officials said.