This is not so new for English readers. It’s to help Japanese readers understand the situation well.
http://www.tepco.co.jp/nu/fukushima-np/roadmap/images/m121203_03-j.pdf
http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130617_02-j.pdf
http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130628_03-j.pdf
Iori Mochizuki “I’ll be the one to protect you from a will to survive and a voice of reason” -Counting Bodies Like Sheep To The Rhythm Of The War Drums, APC