SCANA Corp. and Santee Cooper dodged a deadline issue at their V.C. Summer nuclear plant expansion Friday, negotiating an extended interim agreement with contractor Westinghouse Electric Co. to allow work to continue on the site. SCANA, the majority owner of the Summer project, and South Carolina’s state-owned utility Santee Cooper are assessing whether it wants to take control of the project from financially troubled Westinghouse or if they should abandon the project. The extension should allow…