@whiteline Nuclear attack submarine does not mean nuclear armed, it means nuclear powered.

Attack submarines are what used to be called "hunter-killers", they don't typically have nuclear weapons (technically US attack subs could have carried nuclear armed tomahawks, but as far as we know that did not happen), their main purpose is hunting ships and other subs, and as a secondary job they can sometimes support other operations with cruise missiles.

Nuclear armed subs are Ballistic Missile Submarines (or 'boomers' as they are nicknamed).