A nuclear power plant in Illinois, US, operated by power firm Exelon Generation is being monitored after offsite power was lost and smoke was seen coming from an onsite transformer.
The Nuclear Regulatory Commission region three office in Lisle activated its incident response centre after declaring an “unusual event” had taken place. An unusual event is the lowest of four levels of the NRC emergency classification system.
The plant automatically shut down due to the power loss and the plant fire brigade could find no evidence of fire. The plant – located in Byron, Illinois, 27km southwest of Rockford - comprises two units and the incident happened at unit two. Unit one remains at full power.
Byron nuclear power plant began full operation in 1987, and consists of two pressurized water reactors constructed by nuclear reactor vendor Westinghouse.