The Fukushima Daiichi nuclear disaster occurred on March 11, 2011, after
a devastating tsunami triggered by the magnitude 9.0 earthquake
engulfed the nuclear plant. Some reactors' coolant systems failed which
resulted in multiple hydrogen-air chemical explosions. Three of the
plant’s six nuclear reactors melted down and radiation leaked into the
atmosphere, soil and sea.
The incident was called the world’s worst nuclear disaster since the 1986 Chernobyl catastrophe.
Cleaning the toxic waste from the abandoned nuclear plant and reactors decommissioning have become TEPCO’s principal task.