It is unclear at this time what occurred yesterday evening at the Braidwood nuclear power plant in Illinois, but plant operators declared an Unusual Event at 7:43 pm due to gunshots fired in the Owner Controlled Area. According to the Event Report on the Nuclear Regulatory Commission’s Event Notification page, the control room was notified that fourteen gunshots were heard.
Local law enforcement was called and an investigation was conducted. It must have been an exhaustive investigation, as the station returned to a “normal security posture” at 7:56 pm, a full thirteen minutes after the initial report, including travel time for law enforcement. The Unusual Event was terminated at 9:34 pm. Both units at Braidwood continued to function at 100 per cent power during the incident.
At this hour, there are no press reports on the Unusual Event.