I mentioned this in other forums, the Molten Salt Reactor was actually developed into a working prototype in the early seventies. Most of the major development issues were worked out (see ORNL). When they pulled the plug in the early seventies the reason given was “It wasn’t a true breeder! Then the first oil price shock came in the early seventies and still the design was not revived.
Point of information, the US has the second largest reserves of thorium in the world. So what killed it politics, lobbying, stupidity, all three! This technology might finally be revived. When I looked into who buys stock in thorium fabrication I found that wall street investers are buying hundreds of thousands of shares at a clip. The advantages of thorium MSR
low short lived radiactive wastes, the ability to burn high level waste held in storage, safety against proliferation and loss of control, have been mentioned by myself and others. I think we are going to hear more about thorium ie. FUJI MSR (if refunded) a strong program in India etc.