Could France have built a nuclear-powered Queen Elizabeth-class carrier?
Short answerYes in principle, but French reactors and machinery would have forced substantial hull and propulsion adaptation around the British design's internal systems.
NotesThe Queen Elizabeth design had considered electrical drive supplied by nuclear power, so nuclear propulsion was not conceptually alien to the project. The practical difficulty was fitting French reactors and their associated machinery into a design developed around different equipment. The resulting ship could have looked French at the hull and propulsion level while retaining much of the British automation and internal arrangement. A shared carrier design can still demand extensive national adaptation below the visible exterior.