The cooling system failed at three reactors of the quake-hit Fukushima No. 2 nuclear power plant Saturday, the operator Tokyo Electric Power Co. said.
The company, which has already scrambled to deal with radiation leaks at its Fukushima No. 1 plant, notified the industry ministry that the failsafe system at the No. 2 plant stopped functioning as the temperature of coolant water has topped 100 C.