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None of these modular "blueprint reactors" has been build. not a single one is producing power on gridscale.

The U.S. Navy has a few hundred samples built. They just put boats around them.

You are correct, but nuclear is weird: it has so many regulatory and NIMBY hurdles that change is hard.

However, what has happened is that many many people have taken a swing at scalable reactors for a long time in the design phase.

And we do know the test ORNL reactor for MSR/LFTR practically fit in a closet, at least for the actual reactor.

So there is an opportunity.