That is unlikely.

About an 8, but not for like 100 years. You, know, that acually might be what destroys our planet.

Being a self proclaimed expert on such situations (i didn't just pick the name at random), in the next 10 years, 3, in the next 100, 5, though it can change at anytime to anything, and a nuclear shelter will not help you, unless you are 1000's of kilometers from a target, and we do not have enough nuclear weapons to completely destroy Earth, we can kill everything and make it uninhabitable but we can not turn Earth into an asteroid belt or any other equivalent.

search Cheyanne Mountain, that's what you would need to survive a direct hit, and to survive the time it would take to become safe to leave

There's also a Russian version, i think it's Yamanto or something like that (not the Jap battleship)

bunkers only help in the blast (if not near ground 0), they dont really help for fallout unless they are heaps deep enough or heavily lead lined.

I reckon chances of nuclear war are very low (2-3) simply because;

who really wants to have the feeling of causing the death of the human race.

Though i see the possibility of a singular or multi nuclear terrorist strike to be a 7

cheyanne mountain is good only the time that u have enough food/ unradiated water supply, unless u have a stargate there of course.