Japan has failed to mention 640 kilograms of unused plutonium in its reports to the International Atomic Energy Agency (IAEA) in 2012 and 2013. An official in Japan’s Atomic Energy Commission said on Saturday that the 640 kg was part of the plutonium-uranium mixed oxide fuel, known as MOX, that was placed in an offline reactor at the time and was considered as being used. The MOX fuel was loaded... 

Fresh plumes of most probably radioactive steam have been detected rising from the reactor 3 building at the crippled Fukushima nuclear plant, said the facility’s operator company. The steam has been detected by surveillance cameras and appeared to be coming from the fifth floor of the mostly-destroyed building housing crippled reactor 3, according to Tokyo Electric Power Co (TEPCO), the plant’s...