Wikipedia deletionists have already put a speedy deletion tag on that. Go Wikipedia!
http://www.ansn-jp.org/jneslibrary/npp2.pdf
That PDF has a schematic of the containment building on page 4. The "MARK-I" image corresponds to the Fukushima I-1 building.
More detailed cutaways:
from, respectively,
Madgi Ragheb, UIUC https://netfiles.uiuc.edu/mragheb/www/NPRE%20457%20CSE%20462...
I have no clue what's going on (and I Am Not An Engineer), but I'm fairly sure that in this photo
http://upload.wikimedia.org/wikipedia/commons/e/e8/Fukushima...
The longer, rectangular buildings on the seaside are the turbine halls, and the square buildings next to them (in the inland direction) are the containment buildings.
http://en.wikipedia.org/wiki/File:2011-03-12_1800_NHK_S%C5%8...
http://en.wikipedia.org/wiki/2011_Sendai_earthquake_and_tsun...