... "30% or better chance" ...

Over what time period?

... "30% or better chance" ... in the next 24 hours is pretty scary.

... "30% or better chance" ... between now and the end of time is somewhat less than gripping.

Especially considering that a 'dirty' bomb, a radiation dispersal device that makes a mess, is by far the more likely form of "nuke device".

I figure I'm well away from any, population centers, ideological or symbolic targets. I don't consider it a major threat. Of course a simple BOB or kit likely has a pretty much what you need. A P-100 dust mask to keep particles out of your lungs and a simple disposable poncho to keep the dust off your skin are a pretty good start. Add a set of rubber gloves and boots and your set for most dirty bomb events.

Potassium iodide can help to keep your thyroid safe from radioactive iodine uptake and your certainly free to keep a supply handy for a worse case but I wouldn't think the mushroom cloud form of nuclear device is very likely. Even if it is I'm not close enough, or down wind of, any likely targets so it doesn't apply to me directly.

In the wider scale of things a natural disaster or accident is by far more likely to be your survival challenge.