Keeping a nuclear aircraft carrier in service for 50 years depends on one maintenance period that has become longer, riskier, and harder to predict. The Navy’s midlife Refueling and Complex Overhaul, or RCOH, is supposed to reset a carrier for another quarter-century. In practice, it has become one of the most demanding industrial jobs in the American defense system.
An RCOH is far more than a reactor refueling. The work begins with shutting down and cooling two nuclear reactors, moving the ship into dry dock, opening major sections of the hull and propulsion plant, and then rebuilding systems that touch nearly every part of the ship. According to Navy officials, the overhaul covers propulsion equipment, infrastructure, combat support systems, aviation gear, electrical networks, tanks, valves, pumps, piping, and crew spaces. That breadth is the first reason schedules slip: the shipyard is not servicing one machine, but effectively renewing a floating city. The second problem is hidden condition. Carriers arrive with planned work packages, but some of the most consequential damage is discovered only after teardown begins.
That has become especially clear with the Nimitz-class carriers now moving through midlife overhauls. Navy officials said inspections on both George Washington and John C. Stennis found significant damage to one steam turbine generator on each ship, creating unplanned work that extended schedules. Those generators are deeply embedded, and they are central to converting reactor heat into shipboard power. Once a yard finds damage in a component that was expected to last for decades, the entire sequencing of labor, materials, and testing changes. Stennis, which entered overhaul in 2021, is now expected to take about 5.5 years, while George Washington’s availability stretched to 2,117 days, nearly six years.
Capacity limits make the situation worse. The Navy relies on one shipyard equipped for carrier refueling overhauls at Newport News, Virginia, and the same industrial base also supports new carrier construction. That means delays do not remain isolated to one hull. They stack up across the enterprise, competing for skilled labor, dry dock space, sequence-critical parts, and engineering attention.
New construction has shown the same pattern. The future USS John F. Kennedy saw its delivery move to March 2027 from July 2025, with the Navy citing Advanced Arresting Gear certification and continued weapons elevator work. The future Enterprise also slipped because of late delivery of sequence-critical material. Those are construction problems, not overhaul problems, but they point to the same structural issue: modern carriers depend on tightly choreographed delivery of complex systems, and the industrial base has little margin for disruption.
Labor and planning have also played a major role. Navy maintenance officials have acknowledged that earlier schedules were sometimes unrealistic and that late material orders and changing work scopes contributed to overruns. A broader fleet review found that 75% of ships entering maintenance yards stayed longer than planned between 2014 and 2019, while Navy leaders later reported progress after revising duration estimates and improving material readiness. Even so, carriers remain harder than most ships because each overhaul combines nuclear work, major modernization, and one-time access to systems that will not be opened again for decades. The result is a maintenance cycle where every delay carries operational consequences. A carrier overhaul slips because the job is vast, the surprises are real, the workforce and supplier base are strained, and the nation’s carrier industrial capacity has little slack built into it.
