The cost issue: Storing spent fuel is pretty cheap because it is not very voluminous. The USA has produced about 85k tons of spent fuel, which would fit into

The cost issue: Storing spent fuel is pretty cheap because it is not very voluminous. The USA has produced about 85k tons of spent fuel, which would fit into a single football stadium. This means the cheapest thing to do is just kick the can down the road. The proliferation issue: Waste burners require processing of spent fuel, which some states believe is a weapons proliferation risk. The sodium issue: Liquid sodium requires very careful construction of the steam generators and piping to keep it from contacting air or water. This is a sort-of solved problem in that all the sodium cooled reactors have experienced sodium leaks from time to time, but those leaks have been fixed without significant radioactive release. This is an issue that improves with operator experience. The russians do have one waste burning fast reactor running, the BN-800. If they can do it, so can we. https://en.wikipedia.org/wiki/BN-800_reactor https://en.wikipedia.org/wiki/BN-800_reactor