It's been a few years since I last took thermodynamics, so I did some checking to refresh my memory. I'll stand by my original statement. The Rankine cycle is very common in the applications you mentioned, however it is not the same as the Carnot Cycle. Rankine uses two isobaric and two adiabatic (aka isentropic) phases, while Carnot uses two isothermal and two adiabatic phases. A hallmark of the Carnot Cycle is conservation of entropy, which is not realistic in any macroscopic construct.
Rankine is just Carnot with a phase change. All Rankine cycles are also Carnot cycles.
George’s nuke plant was both a Rankine and a Carnot cycle.