Title: Tightening a nut on a guide vane operating seromotor in TVA's hydroelectric plant, Watts Bar Dam, Tennessee. Located 530 miles above the mouth of the Tennessee River, the dam has an authorized power installation of 90,000 kw., which can be increased to a possible ultimate of 150,000 kw. The reservoir at the dam adds 370,000 acre-feet of water to controlled storage on the Tennessee River system