The two most recent reactors built in the US used a modern modular design that was supposed to reduce the chances of construction delays. They weren't late because of planning or permitting.
The modularity was supposed to enable offsite construction of modules in a controlled environment and make it more reliable. What happened in real life is that some modules needed rework and that was only discovered after delivery. That massively fucked the schedule.
The modularity was supposed to enable offsite construction of modules in a controlled environment and make it more reliable. What happened in real life is that some modules needed rework and that was only discovered after delivery. That massively fucked the schedule.