Marking the 50th anniversary of the first U.S. nuclear meltdown

Source Los Angeles Times

On the morning of July 14, 1959, Sodium Reactor Experiment trainee John Pace received the bad news from a group of supervisors who had, he recalled, "terribly worried expressions on their faces." A reactor at the Atomics International field laboratory in the Santa Susana Mountains had experienced a power surge the night before and spewed radioactive gases into the atmosphere.