While The senior vice president and chief strategy officer at Exelon predicts there will be no new nuclear plants built in the United States. Because of the plants' size and security needs, the costs become prohibitive.
Only a decade ago, nuclear reactors were cash cows. But a combination of low natural gas prices and a boom in solar and wind power has rendered them unable to compete in states with price competition for power. Five of the country’s nuclear plants have shut down in the past decade. Of the remaining 99, at least a dozen more may close in the next. ...The average American operational nuclear plant is 37 years old. -https://theconversation.com/the-demise-of-us-nuclear-power-in-4-charts-98817
List of cancelled nuclear reactors in the United States..By the end of the 1970s it became clear that nuclear power would not grow nearly as dramatically as once believed. This was particularly galvanized by the Three Mile Island accident in 1979. Eventually, more than 120 reactor orders were ultimately cancelled[2] and the construction of new reactors ground to a halt. - https://en.wikipedia.org/wiki/List_of_cancelled_nuclear_reactors_in_the_United_States