cost overruns en $2 Billion TVA Reactor Cost Overruns <p>SPRING CITY, Tenn. (AP) &mdash; The Tennessee Valley Authority cost estimate to complete Unit 2 at Watts Bar Nuclear Plant in Spring City, Tenn., &nbsp;has been revised upward to $4.5 billion.</p><p>The earlier estimate in 2007 had been $2.5 billion.</p><p>In a statement released Thursday, the federal utility blamed the increase on poor previous estimates and that reviews to support the initial estimate were not completed.</p> Sun, 08 Apr 2012 00:06:47 +0000 AP/WMOT 9537 at