During Sweden's nuclear build she added electricity at 7 times the per capita rate at which Germany has added wind+solar over the past decade. France added nuclear electricity about 5 time faster.
During the 1970s/80s people just built nuclear and it worked. They didn't need new grids, energy storage, energy efficiency. And nuclear can deliver many more advantages that renewables can't even dream of ... desalination, overnight electric vehicle charging, synthetic fuel generation, etc.
China isn't waiting for new nuclear designs, but it is developing them ... particularly small modular reactors. When they come on line, they will roll off production lines on the back of trucks. In comparison, renewables are an environmental nightmare. Vast areas of land covered in mirrors, PV, wind farms etc. If it's farming land, that's irresponsible, if it's forest, ditto.
Run the numbers. Please. How big an area would you have to cover with mirrors to produce with solar thermal electricity the amount produced by the 6 Fukushima power plant reactors? You would have to cover an area about the size of the 20 km evacuation area ... permanently. Level it, and cover it in concrete and metal and mirrors... for ever. Why? With nuclear, people can live there, farm there and wildlife can have a share also, but not if you blitz the area for a solar thermal electricity plant.