The lead smr is nuscale they are making small light water reactors like they have on nuclear submarines. they’re nothing new. They’ll likely be obsoleted by 4th gen nuclear reactors being developed in China. The US is doing work on the 4th gen reactors but its slow. Most federal funding goes to the light water reactors. Alas, the light water crowd controls US development.
I believe Gates, and Buffett have their greedy little paws in these Wyoming / Utah start ups. So be wary.