We've had that since the 60s. It's called a thorium reactor. It is also the only thing in the world that can use up our existent nuclear waste as fuel and reduce the liquid that is dangerous for 100,000 years into a brick that is dangerous for 100 years. It is also stable for a much wider temperature range, requires a small fraction of the maintenance, and if everything goes horribly wrong and fails it naturally cools instead of meltdown. It was blocked because of anti-nuclear hysteria and is still illegal even though there are working reactors in existence. Look into it and have fun losing even more faith in humanity to do the right thing (except oh hey, look, China is friendly to the idea tho and made one 2 years ago, better get western press to villainize over again it now).