> There's also a similar American film that seems to get forgotten There's also a similar but more famous American film: https://en.wikipedia.org/wiki/The_Day_

> There's also a similar American film that seems to get forgotten There's also a similar but more famous American film: https://en.wikipedia.org/wiki/The_Day_After https://en.wikipedia.org/wiki/The_Day_After It's pretty similar to the one you describe. It centers on Lawrence, Kansas, which doesn't get nuked, but has to deal with fallout, refugees, insufficient resources, etc.