[dennisw]

That is almost all 100%, pure, unadulterated FUD. Don't believe a word of it. As far as KI goes, it is a thyroid blocker. It is only good if there is a release of radioiodine from a fission source that was active very recently. Anything in the SFPs will have decayed to the point of having essentially no 131I.

If the spent fuel rods started spewing next month what radioactive elements would it be sending here via the wind?

[chimera]

Very, very little. Longer-lived fission product forms include things like 137Cs and 90Sr. Both are mobile in the environment because they are soluble. But that means they are much, much more likely to wash out locally that blow across 12,000 miles of open ocean.