Knoxville, Tenn. (AP) -- The Tennessee Valley Authority's board of directors voted unanimously Wednesday to begin a five-year plan to finish a second nuclear reactor at the Watt Bar Nuclear Plant on the Tennessee River. The Spring City station, about 50 miles south of Knoxville, was the last new nuclear plant to come on line in the United States when it fired up one of its two planned reactors in 1996. The second reactor was never finished because of cost overruns. The plan to finish it is expected to cost about $2.5 billion, likely funded by the public utility's revenues...