Associated Press: A panel appointed by Vermont lawmakers to examine the reliability of Vermont Yankee said Tuesday that a change in corporate culture is needed if the 38-year-old nuclear power plant is to operate past its scheduled 2012 closing. In a revised version of its March 2009 report, the Vermont Yankee Public Oversight Panel took up two issues stemming from developments since then — a leak of radioactive tritium that contaminated soil and groundwater around the Vernon power plant and owner …