The thing about the iron works is actually one of the main problems with scaling up nuclear power. Modern designs are very safe yes, but, building them requires

The thing about the iron works is actually one of the main problems with scaling up nuclear power. Modern designs are very safe yes, but, building them requires steelworking ability that apparently only exists in (yes!) Russia and Japan. There is a multi-decade backlog of orders for the necessary metal, and learning how to work steel in the necessary way is ... not trivial. So it's not even like we could build tons of reactors if we wanted to, designs or no designs.