The Chernobyl Exclusion Zone is 19 miles, and that reactor spewed its guts into the sky for day after day, which is nothing at all like the situation in Fukushima.
So your “100 miles” is just another example of nonsensical hysteria like the BP well going to “destroy all life in the Altantic” or some such.
It wasn't hysteria. It was an estimate based on the fact that, at least according to the reports I've heard, they've evacuated the area for a 50 mile radius around. Now, for the purposes of discussion here on the forum, I speculated that might be the case because - I admit - I am ignorant of how it will ultimately turn out.
But it is insulting to ascribe it to some sort of hysteria. An approximation while things are still going on is all *anyone* can come up with, even someone with overwhelming knowledge and immune to all forms of hysterical thinking.
Nineteen miles may be the "official" exclusion zone, but ask yourself - "Did the Soviets really care about the people?". Plus weather patterns have to be considered. That area of the Ukraine has much higher than normal cancer rates. I don't know if the birth defects have been measured.