From today’s Nuclear Regulatory Commission’s Event Notification Report page:
1. On Sunday, the sole reactor at the Grand Gulf nuclear power plant in Mississippi shut itself down following a turbine trip. Grand Gulf’s report stressed that all the shutdown systems functioned as designed, and added that there were “no challenges to Primary or Secondary Containment at this time.” That’s a good thing, because that’s not always the case at some nuclear facilities, as indicated in Item 2.
2. On Saturday afternoon, technicians at the Monticello nuclear power plant in Minnesota notified the Control Room that there had been a loss of secondary containment after a failure of the safety interlock system in the Reactor Building. This resulted in two doors to the Reactor Building being open at the same time.
As you know, there have been a lot of incidents so far this year involving doors being opened and containment being lost. This kind of incident has the potential for catastrophic results. If there are three places you want to make sure that inner and outer doors are not open at the same time, it’s submarines, spacecraft and nuclear power plants. It’s enough to drive you to drink. Speaking of which, there’s Item 3.
3. This morning, Connecticut’s Millstone nuclear power plant reported that a contractor supervisor “violated the Dominion Nuclear Connecticut FFD (Fitness for Duty) policy.” If that sounds less than forthcoming, it’s a lot better than Friday’s version of the same report, which was blank. I was worried that Fitness for Duty reports are so common that nuclear operators keep a template on hand in anticipation of the next incident, and that someone had accidentally submitted the bare bones report. Today’s report indicated that the supervisor’s access to the plant has been “suspended pending assessment and management review.”