Boring old water cooled reactors (both boiling and pressured) are comparatively dangerous compared to quite well tested lead-bismuth cooled small modular reacto

Boring old water cooled reactors (both boiling and pressured) are comparatively dangerous compared to quite well tested lead-bismuth cooled small modular reactors, which not only loadable on train car as self-contained part that needs no internal access, but are self-sealing in case of failure. Of course it's not as exotic as pebble bed reactor, or helium-cooled uranium-thorium reactor.