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SODDY DAISY, Tenn. (AP) -- Tennessee Valley Authority officials say construction on the Watts Bar Unit 2 nuclear reactor is on schedule to be finished in December 2015 and the cost are still on target about $4.2 billion.

TVA Senior Vice President for Nuclear Construction Mike Skaggs says about 17 million man hours of work have taken place without incident.

Watts Bar unit 2 Completion Manager Rob Beecken told the Chattanooga Times Free Press (http://bit.ly/Vv1CfW ) the process of operating two reactors together is an ongoing one that is completed in stages.

Watts Bar, 48 miles northeast of Chattanooga, has been a start-and-stop project. Initially started in 1973, the project was shut down in 1985 when it was said to be about half finished at a cost of $1.7 billion.

Work resumed in 2008.

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