5 times the size of one of our toy carriers
Looks a bit old and rusty tbh. You'd think they'd give it a coat of paint or two.
The factor in that decision would be cost.
Nuclear powered vessels are astronomical to run and carriers are the most expensive nuclear vessels of them all. Gas powered turbine powered are considerably less to construct and run.
Navy studies suggest that compared with conventional turbines, nuclear power saves money over the 30-year lifetime of a ship only if the price of oil stays above about $70 a barrel.
Going back a few decades and I would agree with you but the price of oil is going to start to change that. With nuclear power you won't have to worry about the price of oil or the supply of it.
Source: http://www.subcap.com/3-15-08 - Running Aground - NJ.pdf - Page 5
Do the planes fly on nuclear?
Actually the US make a prototype and the Soviets went further with a plane that was fitted with both convential and nuclear power!
Interesting, do the planes perfrom as good with synthetic fuel?
Better picture here, showing off the Royal Ensign. I do have one somewhere with a Spitfire doing a low flypast of the Ship, but I can't find the CDR with it on just now.