Satellite images of Fukushima power plant released

[FBaggins]

On the far left in the photo is the No.4 reactor building after an explosion on Tuesday.

...snip...

White plumes are seen rising from the steel frames of the adjacent building housing the No.3 reactor. The vapor is believed to have been generated from evaporating water from the spent fuel rod storage pool, where the cooling system is not working.

Similar plumes are also seen rising from a hole in the outer wall of the No.2 reactor building.




http://www3.nhk.or.jp/daily/english/17_11.html

Interesting that it may be that visually-less-damaged unit#2 that puts out the most radiation.