Thanks

Then apart from the Russian Icebreakers which later became adventure cruise ships Sevmorput was the only commercial nuclear ship.

Mutsu was the Japanese nuclear-powered ship. I don't believe she ever traded commercially, neither did Savannah or Otto Hahn. All three were purely experimental, although Otto Hahn was later converted to a containership with traditional diesel propulsion and traded on for many years afterwards.

The Jap's had one as well, Mitsui or Nissui, not sure of the name.Fishermen barricaded it in as port somewhere. Not sure if it ever got to sea.

She was one of 7 types of barge carrier built by the USSR between 1978 and 1989.

One Sevmorput was nuclear powered, I think the only commercial cargo ship built apart the US Savannah and West German Otto Hahn.