Nuclear surface ships are a joke and a waste of money. An exotic way to boil water. A conventional carrier has the exact same capabilities as a nuclear carrier.
A 30 year fuel supply is not a waste of money. How much oil would be used on a giant carrier in 30 years.
My understanding was that nuclear powered USS carriers can go 5 years without refueling.
That right there would make it very different than a conventionally powered carrier.
As long as there are gas stations periodically...
One advantage for a Nuke CV is most of its fuel tank capacity is used to support the combat air wing. As an example CV-67 USS John F. Kennedy carried 2.5 million gallons of DFM for the boilers and 1.5 million gallons of JP-5 for the aircraft. A Nimitz class CVN carries 3.5 million gallons of JP-5 for air wing and about 500,000 gal of DFM for the emergency diesel generators, small boats and an occasional unrep for her escorts.
But the nuke does not need frequent refueling.