Location: Southport, NC
Owner: Progress Energy
Near-miss: Inadvertent discharge of toxic halon gas, a fire suppression agent,
prompted control room operators to declare an Alert, the third-most-serious of four emergency classifications. Response was delayed because workers didn't know how to operate the computer systems that told offsite workers to report to emergency-response facilities.
Source: Union of Concerned Scientists, The NRC and Nuclear Power Plant Safety in 2010