Nuclear-powered ships aren't entirely uncommon and over the years their number has probably exceeded that of all the LNG-fuelled ships ever built. However, with few exceptions all of the vessels have been military ships and in the main submarines. In the commercial sector - if the Russian-owned nuclear icebreakers are excluded from the count - only four nuclear merchant ships have been built. They were not exactly successful and Russian-owned Sevmorput is the only one still in service. That ship's survival is an interesting story as it was planned to be scrapped on more than one occasion and was also expected to be turned into a drill ship for Arctic oil exploration, before being recommissioned in 2016 to carry mainly military cargoes on the Northern Sea Route (which, coincidentally, is the meaning of its Russian name).
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