The big problem is the lack of knowlage and experienced. Simply put almost nobody has experience with building reactors, and specially not that one. And outside

The big problem is the lack of knowlage and experienced. Simply put almost nobody has experience with building reactors, and specially not that one. And outside of it being nuclear, its also an incredible large civil engineering project with incredibly high specification. The US is not exactly known for being great at executing large civil engineering projects. The reality is if you want cheap nuclear you need to mass produce it, just like with everything else. But that requires large scale state action and planning. Or alternatively having a competitive market for smaller nuclear. But for that to happen regulatory approval processes and many other problems are in the way.