This is sort of how France's nuclear industry works. They made dozens of on-land plants, all based on the same design. The design is something like 50 years o

This is sort of how France's nuclear industry works. They made dozens of on-land plants, all based on the same design. The design is something like 50 years old now, but the result was extremely economically competitive and reliable, since the parts were interchangeable (so they could benefit from economies of scale), and workers and training were transferable between plants. As I understand it, the US has never built the same design more than once (or maybe a few times), so each plant has to be engineered and manufactured from scratch, and all the training, logistics, maintenance schedules, etc, are one-off projects.