Carrier endurance comes with reactor-specific crews

Nuclear propulsion removes most of a carrier's need to store ship fuel, freeing capacity for aviation fuel and even allowing some fuel to be carried for escorts. Reactor refueling occurs on a scale of years, so the carrier can remain ready without waiting for conventional bunkering before an emergency departure. The reactors are reduced in power rather than simply switched off, and each unit develops its own operating chemistry over time. USS Enterprise illustrates the manpower consequence because each of her eight reactors required an evolving guide and a dedicated watch. Identical reactor models therefore cannot be treated as interchangeable machines monitored casually from one central station. Nuclear endurance buys readiness and payload capacity, but it also demands qualified people in significant numbers.