What nuclear propulsion would change in an interwar heavy cruiser

What could an interwar heavy cruiser gain from a nuclear plant in place of conventional boilers and fuel?

It would gain endurance and valuable internal space, but would still need turbines, backup generators, trained crews, and some conventional fuel.

A reactor would replace the cruiser’s boilers rather than eliminating the entire machinery plant, because steam turbines and electrical systems would still be required. Funnels and much of the fuel bunkerage could disappear, opening the ship's centreline and internal volume for anti-aircraft weapons or other systems. Diesel generators and emergency fuel would remain, and the need for watch personnel means crew savings would be limited. The largest operational gain would be endurance and reduced dependence on fleet oilers, while carriers could use their saved displacement and volume for aviation fuel and weapons.