ID3 vTOPE NPRTCOM TALB Weekend Edition - SaturdayTIT2 ) Digging into the Big Dig's Safety IssuesTCOP 2006TRCK 16TCON NationCOMM 4 nprComment Massachusetts Gov. Mitt Romney has seized control of a probe of Boston's Big Dig highway project. He says he will decide when to reopen a tunnel that was the site of a fatal collapse. Boston Globe reporter Scott Helman and Scott Simon discuss the political implications of Romney's move.TPE1 NPRTYER 2006 P , jc+'@ 0