Steam Powered Starships?

Steam Powered Starships?
It seems a safe bet that the ships in Full Thrust are Fusion powered. 
The question is how do that convert heat from the reactor into 
electricity?

The best way I know of doing this is by a steam plant as in a 20th 
century fission powered submarine. This means that a starship will have 
steam turbines and live steam lines running in the engine room. 
Emergency power might be generated by a solar boiler. A mirror array 
focuses sunlight onto water tubes, producing steam for the turbines.

This brings about the image of a fleet in orbit having to wait until 
they have raised steam before moving or fighting.

The more things change...
MRB

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