You can quite easily shield all your components from outside pulses. However, if you're processing signals from the air (like in the case of Radar systems, the

You can quite easily shield all your components from outside pulses. However, if you're processing signals from the air (like in the case of Radar systems, the ones I worked on), your stuff could quite easily get fried. Like an amp could get overloaded, a processor could get fried, a line could get burned, all kinds of things could go wrong. But the best thing you can do is have everything off. If you're close enough to a nuke that stuff that's off gets fried, your electronics are probably pretty low on your list of priorities.