1km or 1120km radius? Please clarify.
“1km or 1120km radius? Please clarify.”
The latter, in the case of a detonation 100km from the surface. It’s simply a function of line of sight to the ground.
Now, what the effects in that area is the question, and both Hawaii and Kakhakstan were in the range of the 1960s tests and there were no severe power station failures there.