Comment by tim333

The US had a similar but not identical reactor in the 60s, the Molten-Salt Reactor Experiment https://en.wikipedia.org/wiki/Molten-Salt_Reactor_Experiment

It had uranium-233 from breeding from thorium in other reactors.

The main problem with these things is they seem very unprofitable. The US reactor ran from 1964 to 1969 and produced a small amount of power but is still running about $10m a year in decommissioning costs. You thing you can run these things a while and think it's over but:

>Sampling in 1994 revealed concentrations of uranium that created a potential for a nuclear criticality accident, as well as a potentially dangerous build-up of fluorine gas: the environment above the solidified salt was approximately one atmosphere of fluorine. The ensuing decontamination and decommissioning project was called "the most technically challenging"...