FILE - In a Wednesday, Oct. 19, 2011 file photo, Walter Lee, right, manager of Nuclear Emergency Preparedness leads the evaluation as the Tennessee Valley Authority conducts an emergency preparedness ... more 
FILE - In a Wednesday, Oct. 19, 2011 file photo, Walter Lee, right, manager of Nuclear Emergency Preparedness leads the evaluation as the Tennessee Valley Authority conducts an emergency preparedness drill in the Central Emergency Control Center in Chattanooga, Tenn. The drill involved a simulated explosion releasing a small amount of radiation at TVA's Watt's Bar Unit 1 power plant near Spring City, Tenn., between Chattanooga and Knoxville. In changes which went into effect on December 2011, the U.S. government is allowing communities within 50 miles of nuclear power plants to practice less often for major accidents and is recommending that far fewer people who live nearby be evacuated immediately. Under new emergency planning rules, federal regulators also are ending a requirement that emergency personnel always practice for a release of radiation. (AP Photo/Chattanooga Times Free Press, Dan Henry) less 
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Associated Press | Photo By Chattanooga Times Free Press, Dan Henry
Wed, May 16, 2012 3:10 AM EDT