Like what @mikeash is referring to. China is planning on building tens of these things in the next few decades. They are creating factories to pump out AP1000s on a standardized system.
Vogtle is a brown field site (their are already reactors there) and like most American plants, they are all built custom made. Every one of the U.S's 104 plants are different. It made engineering maintenance hellish. This stems from many things, but the easiest explanation is location specific laws and protests. By the time you get clearance to build it, a lot of things will have changed. Hence, standardization goes out the window.
Vogtle is a brown field site (their are already reactors there) and like most American plants, they are all built custom made. Every one of the U.S's 104 plants are different. It made engineering maintenance hellish. This stems from many things, but the easiest explanation is location specific laws and protests. By the time you get clearance to build it, a lot of things will have changed. Hence, standardization goes out the window.