Czechia is quite nuclear-friendly and yet we ran into a problem with nuclear fuel supply; you don't feed raw uranium into the reactor, you need specially designed fuel rods. Switching from Russian to American ones for our nuclear power plants took several years. We just finished doing so, and now there is a conflict between the US and the rest of the world as well. Lovely.

All solvable, all better than just running out of oil, but I wouldn't call the situation "independence", just "having a better buffer".