The Fukushima nuclear disaster is a series of ongoing equipment failures and releases of radioactive materials at the Fukushima I Nuclear Power Station , following the TÅ hoku earthquake and tsunami on March 11 , 2011 . The Fukushima I nuclear accidents ) genshiryoku hatsudensho jiko -RCB- -RCB- are a series of ongoing equipment failures and releases of radioactive materials at the Fukushima I Nuclear Power Plant , following the 2011 TÅ hoku earthquake and tsunami at 14:46 JST on 11 March 2011 .