It sounds like you’re suggesting that the reason the US takes longer to build nuclear plants is because of more rigorous safety requirements or something. I’m not convinced though, considering the US’s track record on the rest of its power infrastructure.

I think there are a ton of reasons why the US is so slow to build nuclear reactors, most of which have nothing to do with the technology itself.

Obviously the problem needs addressed though, and we know it’s a solvable problem - the chart you posted says as much.