> so far, none have actually happened

https://en.m.wikipedia.org/wiki/Akademik_Lomonosov

Not without its fair share of criticism, budget overruns and all other problems associated with building new nuclear reactors these days, but it did happen

China connected an SMR to the grid several months ago: https://www.powermag.com/china-starts-up-first-fourth-genera...

There is less scope for corruption around SMR, so little demand when the main attraction of nukes is their prospect for a long-term corruption cash cow.