Yukiya Amano, the head of the International Atomic Energy Agency said Saturday that human error was among the factors that exacerbated the nuclear crisis at the Fukushima No. 1 power plant.
"There were a series of human errors" that led to the deepening of the disaster triggered by the March 2011 earthquake and tsunami, Amano, the IAEA's director general, said in an interview.
One of the most serious was the Nuclear and Industrial Safety Agency's failure to effectively supervise Tokyo Electric Power Co., the operator of the plant.