Didn't the RN look into nuclear powered surface ships at one point? The acronym NIGS comes to mind, though its meaning and context escapes me.
IIRC the NIGS was an AA missile to replace Sea Slug (NIGS stan for
New
Naval
Guided Weapons
System)
It was a semi-active homing dart which after some long design work was eventually evolved into Sea Dart (which is a much smaller missile). To carry NIGS to sea a new large surface ship was proposed, using both steam plant and a niclear plant or just neclear plant, but NIGS refered to the weapon and not the ship.
_________________
Thank you Kim for the crest
"Never fear to try on something new. Remember that the Titanic was built by professionals, and the Ark by an amateur"