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I worked for 11 years as a navy nuke, 2 years in school and 6 years on the USS Carl Vinson finally ending the job as Reactor Laboratories division leading petty officer. So not only has the Navy had a stellar record they have done it with primarily 20-30 year olds working insane hours for barely over minimum wage spending every spare free moment intoxicated. The Navy's reactors have to be built at a much greater cost as they are built for warships designed to take hits an keep fighting which means lots of redundancy and hardening. They have to be started in minutes, and if shutdown restarted in minutes. Civilian power plants can be shutdown and the less refined fuel will "poison" the reaction preventing a restart for hours.
The Savannah was built in a bizarre combination of stylish passenger liner and awkward to load cargo ship. No matter how they powered it it was bound to lose money. Add politics of not allowing it in many ports and put the nail in the coffin. Still it almost made it to profitability when oil prices were at an all time low, just a few years later when oil prices went up it would have been profitable.
There is also a traditional cargo ship built by Russia that has been more successful, the Sevmorput. If they can do it...
The US Navy at last count had 5,400 reactor years of perfect saftey over 130 million miles. In 11 years I received about .5 rem of exposure total and that was mostly doing maintenance in the actual reactor compartment and taking reactor water samples. That is about 1/2 the radiation you get from a single CT scan of the chest or pelvis. Or division also handled all the waste. By far the mass of waste wasn't really contaminated it was just potentially contaminated and needed special handling.
I love nuclear power. It amazing we pretty much solved the energy crisis before it ever happened only to basically give up on it because Hollywood hype and politics.
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