The major problem is that it will take twenty years to build a power station - look at Hinkley Point Power station
https://en.wikipedia.org/wiki/Hinkley_Point_C_nuclear_power_...
https://en.wikipedia.org/wiki/Hinkley_Point_C_nuclear_power_...
For the price of one nuclear powerplant you could have built 3 nuclear powerplants worth of energy storage this year and over the next 20 years the price of energy storage will drop even further which will make it economical without any subsidies.