How are they ten years behind on a schedule launched three years ago?
China is right now just reaching the goal it set for 2020 capacity in 2016 and things appear to be slowing down.
https://en.wikipedia.org/wiki/EPR_(nuclear_reactor)
> In December 2007, construction of the unit itself began. This was expected to last 54 months, with commissioning planned for 2012
However it is still under construction. Olkiluoto was also a major disaster for France, though it was eventually completed.
South Korea is probably the best example for nuclear construction success, but they have had to jail a few people for forging inspection results.
All in all, I think China has done fairly well with nuclear. Nuclear is a massive project that is insanely complex. It is not helped by trivializing the complexity, nor is it helped when people focus more on public opposition than the construction challenges, IMHO.