There is no reason to continue building, or even operating, conventional nuclear plants. The only reason they were preferred was to produce fissionable materials. Molten Salt Reactors ( https://en.m.wikipedia.org/wiki/Molten_salt_reactor ) provide all the benefits of traditional nuclear plants without the risks or waste.
The other significant aspect is size and distribution— these could be situated in every neighborhood— reducing single-point-of-failure designs and reducing the impact of terrorist attacks.
Yes, there are many newer designs to choose from now relative to the old Combustion Engineering or GE fission reactors.
LMFBR’s were quite popular when I was looking at graduate research in Nuclear Engineering, and Molten Salt is another interesting variant.
Recall also that Inertial Confinement Fusion was going to save the world too. Still is supposed to...someday...
My point is that even the older Gen II nooks worked out in the U.S. because of attention to detail and safety. And with that comes the ability to put out monster power which means powering transportation as well as ordinary electric power for buildings and industry.
What the choice of reactor cycle will be is an optimality problem - but being willing to pick one is a political problem which the California idiots always obstruct.
We are now at a point where this State’s ability to produce reliable electric power is about at its limit, and PGE can no longer maintain reliable power. Outages are more common here then you might think, and the infrastucture is outdated and unreliable.
To then talk of an electric car transportation system is ridiculous - they won’t even discuss where the electrons would come from.