How often does the nuclear propulsion system need to be refueled?

The nuclear propulsion system in naval vessels, particularly in submarines and aircraft carriers, is designed for extended operational life and efficiency. Refueling typically occurs every 25 years due to the engineering of the reactors and the fuel utilized. This extended period allows for a significant duration of operation without the need to bring the vessel back to port for maintenance and refueling.

The sophisticated design and technology behind nuclear reactors allow them to sustain operations for long durations, which maximizes mission capability and reduces downtime. Over time, the reactor's fuel does become less efficient, and the core may need to be replaced or refueled, but the interval of 25 years reflects ongoing assessments of operational requirements and safety standards.

In contrast, shorter intervals such as every 10, 15, or 30 years would not accurately reflect the design capabilities and maintenance schedules established for these advanced systems. Each of these intervals would either indicate a need for more frequent maintenance than is necessary or would extend beyond typical operational expectations.