The Associated Press reported on Thursday, April 18:
The U.S. Nuclear Regulatory Commission says a lightning strike knocked out power to a northern Illinois nuclear plant for several hours Wednesday night, but emergency generators kicked in to keep the site running.
Exelon Generation says it believes lightning hit a substation that carries electricity to and from its LaSalle Generating Station. Both reactors shut down as a safety precaution, and diesel generators continued to power plant equipment.
According to the NRC, LaSalle ended the Unusual Event Thursday morning. Exelon says both units will remain off-line “until appropriate safety checks and procedures are completed.”