The Fukushima nuclear disaster is a series of ongoing equipment failures, reactor meltdowns, and releases of radioactive materials at the Fukushima Daiichi Nuclear Power Plant, following the Tōhoku earthquake and tsunami on March 11, 2011. The plant has six separate Nuclear reactors maintained by the Tokyo Electric Power Company (TEPCO). The accident is the second biggest nuclear accident after the 1986 Chernobyl disaster, but more complex as all reactors are involved.