confirmed these findings." Gregory Jaczko, former chairman of the Nuclear Regulatory Commission, stated, "That's a multi-billion dollar asset that had to be shut down because of improper work planning, improper understanding of how to properly do this containment retrofit". Surrounding population The NRC 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 Crystal River was 20,695, an increase of 50.9 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within was 1,046,741, an increase of 32.4 percent since 2000. Cities within 50 miles include Ocala, ( to city center) and Spring Hill ( to city center). Seismic risk On September 10, 2006, a magnitude 5.8 earthquake occurred 300 miles southwest of the nuclear plant, no damage occurred to the Crystal River Nuclear Power Plant from the rare quake. The odds of such a quake happening again in the near-term around Florida are low. The NRC's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Crystal River was 1 in 45,455, according to an NRC study published in August 2010. See also Progress Energy Inc Levy County Nuclear Power Plant References External links NukeWorker Towers in Florida Buildings and structures in Citrus County, Florida Energy infrastructure completed in 1977 Former nuclear power stations in the United States Crystal River, Florida 1977 establishments in Florida Former power stations in Florida