

To my knowledge there exists exactly one reactor in china, and this is a test project. We know very little about it. I have seen many many talks in the last 10ish years but for such a “break trough idea” very very little actual physical proof for any of the big claims.
Edit: Wikipedia article of said reactor: https://en.m.wikipedia.org/wiki/TMSR-LF1
And a big point is, it is a technology that we have to develop anyway, since big targets like governments, military or big financial or economic companies would want to defend against anyway.