Indeed, Nimitz-class carriers have far more powerful engines,[1] as do as do Russian-made icebreakers, which are civilian ships,[2] as did Savannah, an American civilian ship.[3]

Edit: Carl Vinson, like most nuclear-powered vessels to date, is direct-drive. The Ohio Replacement Submarine is slated to have electric drive.[4]

1 http://en.wikipedia.org/wiki/A4W_reactor

2 http://en.wikipedia.org/wiki/Nuclear-powered_icebreaker#Russ...

3 http://en.wikipedia.org/wiki/NS_Savannah

4 https://en.wikipedia.org/wiki/Ohio_Replacement_Submarine#Ele...