Which ship was the first nuclear-powered passenger and cargo vessel?

NS Savannah was the first nuclear-powered passenger and cargo vessel.

Built in the United States as a demonstration project, Savannah was launched in 1959 and entered service in 1962. Its pressurized-water reactor generated steam for propulsion, showing how nuclear energy could be used aboard a commercial merchant ship. The vessel was named after SS Savannah, an early steamship associated with a historic Atlantic crossing.

Savannah carried both passengers and cargo, but it was never intended to become a normal mass-market liner. Its unusual layout, high operating costs, and the expense of nuclear regulation limited its commercial usefulness. It was retired in 1971.

Savannah is sometimes confused with NS Otto Hahn, a later German nuclear-powered cargo ship. Otto Hahn was the second nuclear-powered merchant ship, while Savannah was the first.