A couple of items from today’s Nuclear Regulatory Commission Event Reports today:
1. Friday afternoon, operators at the Cook nuclear power plant in Michigan manually started the Unit 1 Auxiliary Feedwater Pumps after one of the pumps suffered a bearing failure. According to the Event Report: “Operators were responding to increasing vibrations on the East Main Feedwater Pump and reducing turbine load when the East Main Feedwater Pump was manually tripped [at approximately 90% power] due to high vibrations.” The reactor is currently at 57 per cent output, according to this morning’s Reactor Status Report.
2. Early yesterday morning, the Unit 1 reactor at the Point Beach nuclear power plant in Wisconsin lost all off-site power to two electrical busses. Four of the unit’s Emergency Diesel Generators activated. It took technicians four-and-a-half hours to reconnect offsite power to the panels. The reactor was shut down at the time of the incident.