Electricity Production 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 Limerick was 1 in 18,868, according to an NRC study published in August 2010. Following the Fukushima Daiichi nuclear disaster in 2011, government regulators announced the plant would undergo further evaluations for seismic activity risk. A quarry is located nearby which occasionally does blasting; however, this is done with the consent of plant staff. 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 Limerick was 252,197, an increase of 18.7 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within was 8,027,924, an increase of 6.1 percent since 2000. Cities within 50 miles include Philadelphia (28 miles to city center). See also Nuclear power Fricks Locks Historic District List of largest power stations in the United States Largest nuclear power plants in the United States References External links DoE Page Nuclear Tourist page on this site. NRC page, listing new reactor applications. Includes many more than the "Future" list below. www.exeloncorp.com Energy infrastructure completed in 1989 Nuclear power plants in Pennsylvania Towers in Pennsylvania Buildings and structures in Montgomery County, Pennsylvania Exelon