Yes, that would be it. I posted a link in that thread to the experts' reasons why movement is minimal, but just in case it can't be found.
http://www.navweaps.com/index_tech/tech-022.htm
Also, if you want to spend a lot of time (a big lot of time) finding out things (including why nuclear-powered aircraft carriers don't really go 50 knots, or 45, or even 40) have a look through their main page.
http://www.navweaps.com/index_tech/index_tech.htm