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.
The Fukushima Daiichi Nuclear Accident which began Tuesday March 11, 2011, uprooted thousands of Japanese people, set the worldwide nuclear power industry back a decade, and caused a run on potassium iodide (said to help ward off thyroid cancer). What it didn’t do was kill anyone from radioactive fallout.