this event. On February 9, 2016, the plant was unexpectedly shut down for maintenance to a recirculation pump. The reactor was brought back to full power by February 20, 2016. In addition to Perry, Energy Harbor also owns and operates the Davis-Besse and Beaver Valley nuclear plants. Electricity Production Surrounding population The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of , concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about , concerned primarily with ingestion of food and liquid contaminated by radioactivity. The 2010 U.S. population within of Perry was 83,410, an increase of 8 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within was 2,281,531, a decrease of 3.0 percent since 2000. Cities within include Cleveland ( to city center). Canadian population is not included in these figures. Seismic risk The Nuclear Regulatory Commission's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Perry was 1 in 47,619, according to an NRC study published in August 2010. Security threats At around 6:00pm EDT on April 7, 2021, the FBI's Cleveland Field Office tweeted that there was an ongoing security situation at the plant that necessitated a bomb squad. The following day, law enforcement disclosed that a 33-year-old Michigan man drove to the power plant and told plant security officers that there was a bomb in the trailer he was towing with his pickup truck. No bomb was found; the man was arrested. References External links Energy infrastructure completed in 1987 Buildings and structures in Lake County, Ohio Nuclear power plants in Ohio FirstEnergy