Nolan fan, but that doesn't seem like nolan's work.
"No CGI is envolved" and there was not atom bomb explosion footage, not even close, just TNT detonation.
I have a masters degree in nuclear engineering, and the size of an atomic bomb is not just massive it's something no other thing can reproduce, and they didn't even tried... 3,hours long, boring and DRY.
I would give this film a 6/10 at best.