@p @nanook @fluffy TMSR-1 or whatever its called in chinese works. They literally copied, scaled down and continued the work from Oak Ridge labs 60 years ago, complete with the same FLiBe coolant primary. They succeeded in the first fueling with thorium in late 2024. As far as I know its the most successful Gen IV prototype.

The reason that MSR/LFTR tech hasn't been worked on much is two fold. First is the corrosive problem of the fuel, now mostly solved with modern superalloys. The second being that it is impractical to make a bomb with the thorium cycle because inevitable that any U-233 created during the fuel cycle will be significantly contaminated by U-232 which is a real cunt to handle.