The cost and infrastructure to maintain, service and refuel a reactor as the main limiting factors. Marine reactors are not the same as land based reactors. The upfront cost is the biggest issue to build a cargoship with a reactor. There might come a time when the market has enough demand that nuclear power ships will be the new normal, but we are not there yet. If you want a better understanding, go read out France’s New Nuclear Aircraft carrier or the challenges that Australia is now facing with their decision to switch to nuclear powered subs without having the needed infrastructure.
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