Canada

What the fuck would Canada, a non nuclear weapons country, want a nuclear sub for? Diesel battery subs are inherently stealthier because you can't turn a nuclear reactor off to go quiet and they don't need to stay submerged forever to hide where ballistic missiles are and they're not going to be power projecting to keep Iceland from sending another landing party with Erikson. It's not like Canada doesn't have an abundance of ports for refueling or a military vulnerability to oil embargos. It's not even compatible with their primary method of nuclear fuel since it requires nearly weapons grade refined uranium and the whole point of CANDU heavy water reactors is to not refine.