My hypothesis is that modern economies with high wages will simply not be able to build a nuclear reactor economically. It appears to require a certain amount of 20th century technological advancement, but not so much economic advancement that labor costs are too high.
France had a much better track record with nuclear in their first round of building. France can also build large construction projects without the massive cost overruns that the US has had. But they can't seem to get a next gen reactor built.
A piece about it: https://www.archyde.com/the-folz-report-draws-up-a-severe-as...
This study may also offer some hints: https://www.sciencedirect.com/science/article/pii/S030142151...
Smaller, simpler projects don't tend to have the same issues because contractors know they can be replaced easily if they fail.
> France can also build large construction projects without the massive cost overruns that the US has had
Not always, some easily go overboard, like with the Parisian Philharmonic, or the absolutely massive Grand Paris Express (~200km of new high capacity metro lines around Paris) which has seen the budget go up from an original estimate of 19 billion to 35 billion (euros). Completely normal considering the scale and complexity, but still.
> Since construction began in March 2017, the project has been subject to several delays, including some caused by the COVID-19 pandemic,[10] and this has resulted in significant budget overruns. As of May 2022, the project is two years late and the expected cost is £25–26 billion,[11] 50% more than the original budget from 2016. It is currently planned to be commissioned in June 2027 and has a projected lifetime of 60 years. In February 2023, EDF announced that costs would rise to £32.7bn and completion would be delayed by a further 15 months to September 2028.[2][12]
https://en.wikipedia.org/wiki/Hinkley_Point_C_nuclear_power_...
South Korea was able to eke our small decreases in cost (though some people have ended up in jail for falsifying record keeping). But otherwise, costs tend to rise. And I'm definitely not aware of a drop of 50% or so, to bring these excessive costs into the realm of competitiveness.
Which is 101 of big projects anyway. Hard to understand why french project wasn't deemed to risky to investors.