I don't that that's the major issue. At least, the Wikipedia entry for the NS Savannah only mentions being excluded from Australia, New Zealand and Japan. http

I don't that that's the major issue. At least, the Wikipedia entry for the NS Savannah only mentions being excluded from Australia, New Zealand and Japan. https://en.wikipedia.org/wiki/Nuclear_marine_propulsion#Civilian_nuclear_ships https://en.wikipedia.org/wiki/Nuclear_marine_propulsion#Civi... comments the major issue is the costs of specialized infrastructure, and points out how research about a modern design concluded "further maturity of nuclear technology and the development and harmonisation of the regulatory framework would be necessary before the concept would be viable."