Joe Carson's recent letter to Senator Alexander summaries my concerns.
Other relevant documents include:
Mr. Carson's recent letter to Office of Special Counsel about TVA nuclear safety issuesl;
NRC's response to Carson's letter to OSC about TVA nuclear safety issues;
Carson's reply to NRC's response
Carson's letter to Chairman and Commissioners of NRC in reply to NRC's response
Attorney Loring Justice's April 2013 letter to TVA about Carson's concerns
TVA's response to Attorney Loring Justice, that spurred Carson's letter to OSC