Nuclear is insanely expensive at that scale. Not only is it expensive to get the equipment and fuel, but you also have to have nuclear engineers onboard who are able to resolve any issue with the reactor.
So what advantages do you get? For a surface vessel, you just don’t have to fuel up as often. That is a benefit for something like an aircraft carrier that doesn’t go into port very often and can have supply ships bring in supplies. However, a cargo ship is going from port to port and can easily fuel up at any of them that have the facilities.
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