50 Mile Radius?

Last week, the US Nuclear Regulatory Agency stated that a 50 mile radius around the failed Fukishima nuclear reactor should be evacuated.  The French mentioned the same distance, and they have almost as many nuclear reactors as the US has.  Many of the US reactors are nearing the end of (or have already extended beyond the end of) their 30 year lives.  If the same "50 mile radius" is applied to US nuclear reactor locations, pretty much most of the East coast and Rust Belt would be affected.  See the graphic below.

I am just 25 miles down wind of Palo Verde, the nation's largest Nuke generating station.