Sounds more like a movie. You pretty much resolved the plot in one episode.
But it kinda sounds like a boring show to watch. . .unless it's about the guy's fantasies sprinkled a little with fending off radiation created beasties or something.
A sympathetic character, though. . .
Uhm..........that was a Twilightzone show years ago. Bill's favorite. "Time ENough at Last"
Whoops - I got it. You were too subtle until the last lines. And I was too dumb to not get the "Dusk Area" vs. "Twilight Zone". Effects of heat on brain.
Only when YELAS explained it...
That episode is based on the same basically unrealistic hypothesis that Walter Mathau, I believe, was talking about at a dinner party in the movie "Failsafe." He was saying that File Clerks and Prisoners would be the only survivors, owing to blast-protected circumstances of their average existence, but more to the point, File Clerks represent the force of intellect, while Prisoners represent brute force. (No mention is made of how they get out of their cells when the guards all die-- seems more like a prolonged horror after the horror of the attack itself.)
Anyway, the woman listening was obviously impressed, so if it wasn't a movie, Walter Mathau's character certainly would've gotten laid thanks to that charming bit of cold-war speculation.