US (and British, but they apparently use US tech so it's the same) submarines run on weapons grade uranium. Other nations use less enriched. France runs on 7%,

US (and British, but they apparently use US tech so it's the same) submarines run on weapons grade uranium. Other nations use less enriched. France runs on 7%, Russia apparently 30-40% enriched. But yes, there are certainly other reasons too why submarine reactors wouldn't be a sensible choice for civilian use.