Shouldn't adding additional reactors to already-approved nuclear power plants be a great idea? then you avoid the costly permit process and you can presumably take advantage of some of the existing infrasturcture, at the very least the security perimeter, etc. is it a matter of the expense of building out additional transmission capacity out of the plant that makes this not feasible?

We should be aiming to make electricity 10x cheaper and consume 10x more electricity while using nuclear for most of the base load and solar just for peaking where it makes sense (in desert locations or decentralized applications like on remote homes)