Nuclear powered ships?

No such thing as a sail ship with no form of axillary power of any kind AFAIK.

In fact, in 1959 I did my pre-sea training on the last tall ship without any other propulsion power than sail:


https://www.visitnorway.es/listings-kristiansand/fullriggeren-sørlandet-tall-ship/88453/

The Master on "Sørlandet at the time was also the last Norwegian that only held “Master of Sail” licence. He had never been on a ship with other form of propulsion than sail.

PS> She got an auxiliary propulsion engine installed later that year.