Nuclear just isn’t worth it (in general) on ships that want to travel between ports. A cargo vessel generally wants minimal crew and a safe and minimal maintenance marine diesel
However, russias near-arctic icebreakers and one of its arctic cargovessels are nuclear as it’s difficult to serve the North east passage with oil and other supplies. Especially the icebreakers benefit from having so much energy available and being able to stay at sea for long periods of time.
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