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50- mile EPZ include all or portions of St. Lucie , Indian River , Glades , Osceola Okeechobee , Brevard , Highlands , Palm Beach , and Indian River. 4. 2. 1 . 1 Vulnerability Assessment Radiological accidents can have the following potential impacts on a community : • Electric power outage ; • Surface and air transportation disruption ; • Telecommunications system outage ; • Human and health safety ; • Psychological hardship ; • Economic disruption ; • Disruption of community services ; • Damage to critical environmental resources ; and • Toxic releases . Because of its location relative to the St . Lucie nuclear power plant parts of Indian River County have a high vulnerability to a nuclear power plant accident or nuclear materials release . While the County' s level of vulnerability is high , the frequency with which nuclear power plant accidents occur is very low, and the overall risk to the citizens of Indian River County is therefore considered low. Nuclear emergency in Indian River County has received massive emergency management attention at all levels of government . Emergency management planning and regulation relative to nuclear power plant accidents exists at the %W Federal , State , local , and corporate levels . 4. 2. 1 . 2 Risk Assessment At the time of publication , no data were available to determine the potential loss associated with a radiological accident in Indian River County . 4 .2 .2 Power Failure Power failure can result from a variety of related causes , including sagging lines due to hot weather, flashovers from transmission lines to nearby trees , and incorrect relay settings . According to the electric utility industry's trade association , the potential for such disturbances is expected to increase with the profound changes now sweeping the electric utility industry . To address times when generating capacity is tight, or falls below consumer demand due to State or local emergencies , the Florida Electrical Emergency Contingency Plan was developed . Alerts have been created to give early warning of potential electricity shortfalls and bring utilities , emergency management officials , and the general public to a state of preparedness . The Contingency Plan has four stages ( Florida Reliability Coordinating Council , 2004 ) : • Generating Capacity Advisory — A Generating Capacity Advisory is primarily for information purposes . It starts utility tracking activities , and it initiates *,, inter- utility and inter-agency communication . No action by the public is 4- 54