I've been looking at that drawing for a while, and it seems to be a poor representation of the Olympic stadium in Greece, but you have a good point for that picture too. It matches, although it is out of proportion to an extent.
Reactor containment buildings dont have arches connecting them, but they are similar in their dome like construction, especially if you have two plants close together. I would almost rule out containment buildings based on that photo.
Thats my .02, but it is open to a better interpretation at any time. It perplexes me to no end.