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for an emergency. An EPZ is comprised of two zones, the 10 - mile plume exposure zone and the 50 -mile ingestion exposure zone (Nuclear Energy Institute, 2004). Specific coordinating procedures for response to a general emergency at a nuclear power plant have been prepared in the form of standard operating procedures. These include emergency classification levels, which assist in notifying the public if a problem occurs at a plant. They are defined by four categories (FEMA, 2004): • Notification of Unusual Event — The event poses no threat to plant employees, but emergency officials are notified. No action by the public is necessary. • Alert—An event has occurred that could reduce the plant's level of safety, but back-up systems still work. Emergency agencies are notified and kept informed, but no action by the public is necessary. • Site Area Emergency — The event involves major problems with the plant's safety and has progressed to the point that a release of some radioactivity into the air or water is possible, but is not expected to exceed EPA Protective Action Guidelines (PACs). Thus, no action by the public is necessary. • General Emergency — The event has caused a loss of safety systems. If such an event occurs, radiation could be released that would penetrate the site boundary. State and local authorities will take action to protect the residents living near the plant. The alert and notification system will be sounded. People in the affected areas could be advised to evacuate, or in some situations, to shelter in place. When the sirens are sounded, radio and television alerts will have site-specific information and instructions. The St. Lucie nuclear power generation plant is located 12 miles southeast of the City of Ft. Pierce on Hutchinson Island in St. Lucie County. The facility contains two reactors and is owned and operated by the Florida Power & Light Company. Counties within the 50 -mile EPZ include all or portions of St. Lucie, Indian River, Glades, Osceola, Okeechobee, Brevard, Highlands, Palm Beach, and Indian River. Extent. Due to the low probability of occurrence, this hazard will not be fully profiled Vulnerability Assessment. Radiological accidents can have the following potential impacts on a community: Indian River County Comprehensive Emergency Management Plan Basic Page 60