Time Magazine: If the Three Mile Island atomic reactor near Harrisburg hadn’t melted down 30 years ago this Saturday…well, there probably would have been an accident somewhere else. The entire U.S. nuclear industry was melting down in the 1970s, irradiated by spectacular cost overruns, interminable delays and public outrage. Forbes later called its collapse “the largest managerial disaster in business history, a disaster on a monumental scale.” The TMI fiasco was a scary cultural moment, coming …