A great point, these things were designed a hell of a lot better in terms of containment than the soviet reactors. Worst case they also fill up the buildings with sand and put a massive concrete top on them.
I am concerned now for the surrounding countryside. This kind of accident does render the land uninhabitable, the question is... at what radius?
Pray for Japan. They are hiding the radiation levels now according to drudge. THAT is not a good sign. Not by a long shot. That actually worries me quite a bit.