Similar to sodium cooled reactors, there are also lead or lead-bismuth cooled reactors, which have had one real life deployment ( onboard the Soviet Alfa class submarines), with its own advantages and disadvantages, and there are proposals to develop new versions.
There's so much interesting nuclear-related tech and concepts we haven't fully explored because of nuclear FUD ( much of which would be solved by the new tech).
There's so much interesting nuclear-related tech and concepts we haven't fully explored because of nuclear FUD ( much of which would be solved by the new tech).