Last time I looked, the USA was in a similar position. Hasn't started building one in at least 40 years[1] and the one I saw on that list finishing in 1990 (Seabrook) I thought might be more recent, says it was permitted in 1976, took 14 years to get Unit 1 working and Unit 2 was cancelled due to delays, and cost overruns. That's the kind of thing I'm talking about.
The current 92 of them provided 20% of the USA's electricity generation. So you'd need another 368 to do the other 80%. How long will they take to build, 15 years each? 55 years to go all nuclear, assuming you build ten at a time. How do you get from "we haven't built a nuclear power plant in 40 years" to "we could build 10 at a time continuously for the next half-century" in a convincing way?
https://en.wikipedia.org/wiki/Nuclear_power_in_the_United_St...