Following a major earthquake, a 15-metre tsunami disabled the power supply and cooling of three Fukushima Daiichi reactors, causing a nuclear accident on 11 March 2011. All 3 cores largely melted in the first 3 days. 4 reactors wee were written off due to the damage in the accident. After 3 weeks the 3 reactors were stable with water addition and by July were cooled with recycled water from the water treatment plant. Apart from cooling, the basic task was to prevent release of radioactive materials , particularly from the water leaked from the 3 units. Three Tepco employees at the Daiichi and Daini plants were killed directly by the earthquake and tsunami, but there have been no fatalities from the nuclear accident. The effects from the radiation on land and in the air along with the contaminated water still linger today.
That was the conclusion of the six-volume, Report Of The Fukushima Daiichi Accident, released in August 2015 by the International Atomic Energy Agency. About 1,600 people died in the evacuation of the surrounding areas however, many of them elderly and infirm hospital patients and residents of nursing homes. That would seem to indicate that the response to the accident was more deadly than the accident itself.