I don't know about China, but I would guess that the economies of scale might have an impact. If you are planning to building 100 power plants, you can probably design your processes such that after the initial production, the further ones could be built much quicker.. as you already have your assembly lines ready and busy.

That reminded me of a Wired article I read many years ago (turns out that it was in 2009) that got me optimistic about China and the development of safe nuclear power:

Let a Thousand Reactors Bloom

https://www.wired.com/2004/09/china-5/