Yesterday, operators at the Limerick nuclear power plant scrammed the Unit 1 reactor after an electrical problem knocked out the main generator recirculating water pumps. Today, plant owner Exelon filed an Event Report with the Nuclear Regulatory Commission that revealed an additional problem resulting from the incident.
The plant’s Technical Support Center (TSC) temporarily lost normal air conditioning due to loss of power, and the TSC could not confirm the airflow available from the Emergency Ventilation system. According to the Event Report: “This is considered a Loss of Emergency Assessment Capability.” The report also outlined alternative procedures with the lack of Emergency Ventilation: “If conditions required use of the Emergency Ventilation system, the Station Emergency Director would assess habitability in accordance with Station procedures. TSC relocation of personnel would be directed as required until such time that the TSC ventilation system is returned to service.”