sea levels. 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 Turkey Point was 161,556, an increase of 62.8 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within was 3,476,981, an increase of 15.1 percent since 2000. Cities within 50 miles include Miami (25 miles to city center). Incident history May 8, 1974 A test was performed on all three of the Emergency Feedwater (EFW) pumps serving Unit 3 while the reactor was operating at power. Two of the pumps failed to start as a result of overtightened packing. The third pump failed to start because of a malfunction in the turbine regulating valve pneumatic controller. (ref NRC LER 250/74-LTR) In an ongoing study (ref NRC Commission Document SECY-05-0192 Attachment 2 NRC.gov) of precursors that could lead to a nuclear accident if additional failures were to have occurred, the NRC concluded (as of 24-Oct-2005) that this event at Turkey Point Unit 3 was the fifth highest ranked occurrence. August 24, 1992 Turkey Point was directly hit by Hurricane Andrew on August 24, 1992, destroying two raw water tanks and portions of the fire protection systems, draining another raw water tank, partially disabling the fire protection systems, causing severe damage to various non-nuclear structures, and cracking the smokestack for fossil-fueled Unit 1. The smokestack later had to be demolished and rebuilt. It also suffered a total loss of offsite power, requiring the use of the onsite emergency diesel generators for several days. No significant damage was done to the plant's nuclear containment buildings. The plant was built to withstand winds of up to 235 mph (380 km/h), greatly exceeding the maximum winds recorded by most category 5 hurricanes. March 18, 2017 On March 18, 2017, an electrical fault occurred in a Unit 3 switchgear room, resulting in the loss of a safety related electrical bus and a reactor trip. Other safety systems functioned as required, ensuring adequate reactor cooling. There was no threat to local residents or the environment, and the alert, the second-lowest Nuclear Regulatory Commission