The plan for the first small-scale US nuclear reactor was exciting, ambitious, and unusual from the get-go. In 2015, a group of city- and county-run utilities across the Mountain West region announced that they were betting on a new frontier of nuclear technology: a mini version of a conventional plant called a “small modular reactor” (SMR).
Advocates said the design, just 9 feet in diameter and 65 feet tall, was poised to resurrect the US nuclear industry, which has delivered only two completed reactors this century. It was supposed to prove out a dream that smaller, modular designs can make splitting atoms to boil water and push turbines with steam
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