"blast?" No.

US nuclear powerplants aren't nuclear bombs and can't be made to produce a nuclear explosion.

They ARE high pressure steam systems and can have steam explosions in worst case scenarios but they are mostly radioactive contamination issues of very small magnitude and low probability of contamination getting very far outside the plant.

You should have a bug out kit setup for the family in the event of an evacuation needed for a radiation release (or river flooding or other natural disaster) but you should understand that your drunk-driving fellow road user is a much bigger hazard to you on a recurring basis than the plant.

3.5 hrs is way too far away to worry about the plant. Even if you are directly downwind.

I wish I had a nuclear powerplant in my backyard. Then I could work there and have a shorter commute!