Find $10b+, lobby for permission in the target country, lobby for permission from the US, these are probably the hard parts. Then it takes a lot of time to build too.
Molten salt reactors seem really promising but they're not really established yet afaik.
He has some interesting videos on economic parts of nuclear powerplant construction:
https://www.youtube.com/channel/UC1LpsuAUaKoMzzJSEt5WImw