Core details of nuclear accident not known yet
One year after the disaster at the Fukushima Daiichi nuclear power plant, core details relating to the accident are still not known, including from where a large amount of radioactive material was released.

Following the March 11th earthquake and tsunami, nuclear fuel melted at the No.1, 2, and 3 reactors of the plant. Many people were forced to evacuate because a large amount of radioactive material was released across a wide area. The nuclear accident seriously affected Japan's entire society and economy.
[link to www3.nhk.or.jp]
.