Cost.
Not only is incredibly expensive to build and maintain a nuclear reactor, but you need someone with very specialized training to operate it. The military can do that, no problem, but private sector companies would have a much more difficult time finding someone who can do the job, and it would cost a lot more to hire that person. I’m not sure it would be logistically feasible.
Also, getting the necessary nuclear material in order to operate a nuclear reactor is not the same as filling up a diesel engine.
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