This spring kicked off the best stretch for America’s nuclear industry in decades. It started in April, when, for the first time since 1990, the United States added nuclear capacity for the second year in a row. In June, Congress passed a major law to accelerate nuclear-energy development. The Republican Party’s national platform trumpeted nuclear power, as did Kamala Harris in describing her economic agenda; this fall, three of the world’s largest companies—Amazon, Google, and Microsoft—announced substantial investments in nuclear-energy facilities. In November, the U.S. issued official goals to massively…