If you do all of that, assuming you survived the initial blast, you would stand a decent chance. You would definitely want to have adequate supplies in your chosen shelter for those 14 days, but at least 2 days worth. Sanitation is a must, and best to be done before there is a chance for large amounts of bacteria and mold to contaminate your environment. After the 14 days, you would begin to have to scavenge/forage/hunt for all necessary supplies on an as needed basis. Unfortunately, most of the radioactive dangers have long half-lives and will long outlast the individual human life span. After many generations, the dangers would begin to subside and rebuilding could begin again.
I've done research on this before, but it has been a while. Some of this information may be a little off, but to the best of my memory I have repeated everything truthfully.
This is very plausable but the human mind would be more aware of this than we think or even guess at. We would have gas masks of course and by this time in the world of america which is like nothing in the world today and not similar to any country in the world or any other civilization on earth,,, maybe cause we think differently and are maybe smarter in survival purposes... (i think)... well our people would find an antidote to nuclear hazard. like radiation like rad x and rad away . our also known drugs that polute our societies and minds would maybe help in survival like meth would help people stay awake for days protecting their families and not eating much at all saving food for future purposes.Weed would be out of the question for sure. also our houses would be the most concern in the aftermath of the fallout war. but EVERYONE should know this.. that citizens of U.S. i highly think the same with some or few members of the united states government. ,,, that USA will not fallout from the war or the WORLD without taking the world and the war down with itself.