For Nuke to replace Coal, Nuke would have to grow by 3x.
I am of the opinion that the US should sponsor the development of 3 or 4 classes / templates (power output levels) of Thorium reactors. Perhaps a gigawatt as the largest class, and a 10 megawatt at the smallest.
She wants to shut down nukes, not make more to replace coal. In 10 years.