How many production plants have been deployed with that technology? How long have they been deployed and what is their ROI? We know these answers for solar and

How many production plants have been deployed with that technology? How long have they been deployed and what is their ROI? We know these answers for solar and wind because they've been around for years. Last I heard these new nuclear reactors were just expensive prototypes. I'm not confident that these power plants have the technological readiness to scale up to cover our energy needs in the time we have left. Now, solar and wind have the energy storage problem that has similarly immature solutions. The difference there is that building wind and solar plants is something that can be done (at scale) today to reduce our carbon footprint and buy time. These investments can be further leveraged as storage comes online to wean us off fossil fuels. I understand that nuclear is, at least theoretically, a simpler solution. It just isn't yet practical both due to technological immaturity and due to societal resistance to anything with "nuclear" or "atomic" in the name.