The Soviet Alfa-class used molten lead-bismuth coolant. (Which was run through a separate steam generator to generate steam, granted).
Though there's no principal reason why steam has to be the working fluid. Supercritical CO2, for instance, has many attractive properties.
> Naval reactors are smaller than civilian reactors, but are far more efficient
Hmm, define "efficient"? Efficient as in conversion of heat to mechanical power? Or use of uranium fuel? Or what?
The Soviet Alfa-class used molten lead-bismuth coolant. (Which was run through a separate steam generator to generate steam, granted).
Though there's no principal reason why steam has to be the working fluid. Supercritical CO2, for instance, has many attractive properties.
> Naval reactors are smaller than civilian reactors, but are far more efficient
Hmm, define "efficient"? Efficient as in conversion of heat to mechanical power? Or use of uranium fuel? Or what?