Those Watts Bar reactors were previously the newest ones in the US. Both began construction in 1973: https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetail

Those Watts Bar reactors were previously the newest ones in the US. Both began construction in 1973: https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetails.aspx?current=699 https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetails.... https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetails.aspx?current=700 https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetails.... I think that the headline is a half-garbled way to indicate that this reactor is the first one completed that began construction after the 1970s in the US. That interesting fact is omitted by the body of the story, which doesn't lay out the dates at all. I only knew this background because of my prior interest in the nuclear industry.