You seem to be mixing nuclear power plants and nuclear missiles into the same bag. You say "fallout" but talk only of nuclear plant meltdown.
"Fallout" requires an explosion. A power plant meltdown would irradiate, but would not create the same type of fallout risk pattern as a nuclear bomb/warhead, not to mention the immediate destruction comparison.
At any rate, nuclear plants are designed to be shut down quite quickly and even automatically, and are "hardened" against EMP attack, meaning that they can at least generate enough internal power to cover the fuel rods and shut down. Supposedly failsafe against internal manual intentional sabotage. How well would this work in actuality? Not sure anyone except a double naught seven security cleared expert probably knows.
As far as actual coordinated thermonuclear missile attack and East TN, two words: Oak Ridge (although it's generally considered a secondary target, not primary).
My limited SHTF preps simply don't include nuclear war, except to perhaps break open the case of bourbon and steel myself to blow my brains out when the radiation sickness symptoms become severe.
Many think that rather than nuclear holocaust scenario, the greater likelihood is an EMP event. Two or three correctly placed blasts at the correct altitude = 300 million desperate people plunged into 1870.
Of course, this might also trigger silos and subs around the world to let things rip too, in which case see my above plan.
- OS