Even in countries that are massively pushing for nuclear energy and where the utilities are sometimes outright government-owned, like in France, Finland or the UK, nuclear reactor projects have continuously hit massive cost and deadline overruns: Finland's Olkiluoto 3 had 12 years delay and ended up costing over three times as expected, French Flamanville will end up at over six times the estimated budget and at least eight years delay, and UK's Hinkley Point can't even be reliably estimated.
The only ones being able to build out plants is China, and for what it's worth I think they will manage to blow up at least one of them due to shoddy construction.