Fukushima Daiichi nuclear disaster

The Fukushima Daiichi nuclear disaster (????????????, Fukushima Dai-ichi ( pronunciation) genshiryoku hatsudensho jiko) was an energy accident at the Fukushima I Nuclear Power Plant in Fukushima, initiated primarily by the tsunami following the T?hoku earthquake on 11 March 2011. Immediately after the earthquake, the active reactors automatically shut down their sustained fission reactions. However, the tsunami destroyed the emergency generators cooling the reactors, causing reactor 4 to overheat from the decay heat from the fuel rods.