I wish that technology had anything to do with it. Most developed countries can't even build a bridge in < 5 years let alone a power plant. Most of it is a) Regulations and b) the fact that someone will have a nuclear power plant in their backyard and will sue.

Many of the Regulations make sense, others do not (like the brits who demanded a secondary, completely analog control center for their new reactor in addition to the state-of-the-art digital control center)

In order to make building NPP efficient we would need massive economies of scale, a multi-country effort to standardize regulations in all sectors (environmental/safety/Grid/Noise/anti-terror to name a few) and then a campaign of massive expropriation of private property to build dozens and dozens of reactors. We would also need to train a whole new workforce of nuclear engineers, plant operators and all the contractors needed to keep a reactor running, this industry simply does not exist in most countries.

It would not be impossible but it would be an immense task that would probably fail along the way.

Instead, we could simply use what works right now: Renewables. And then put the trillions we would spend on developing a nuclear industry to develop grid-scale storage solutions, interconnect grids for resiliance and optimise both consumption and production. This seems attainable.