Fukushima Daiichi Nuclear Power Plant Accident Meltdowns in Units 2 and 3 (March 2011 data photo)

November 30, 2011, Tokyo, Japan - Columns of white smoke billow from the badly damaged reactors No. 2, second from right, and 3 at Fukushima No. 1 nuclear power plant in Okumamachi, Fukushima Prefecture, some 210km northeast of Tokyo, in this aerial photo taken and released by Air Photo Service on March 20, 2011. For the first time, the plant operator is not a nuclear power plant operator. For the first time, the plant operator Tokyo Electric Power Co. said Wednesday, November 30, 2011, that the cores of the No. 2 and No. 3 reactors had For the first time, the plant operator Tokyo Electric Power Co. said Wednesday, November 30, 2011, that the cores of the No. 2 and No. 3 reactors had partially melted, and some fuel had burned through the reactors' surrounding vessels to the concrete base of their containment vessels. (Photo by AFLO/ AIR PHOTO SERVICE/Handout) **MANDATORY CREDIT**.