HOUSTON, March 1 (Reuters) - Royal Dutch Shell Plc's 316,600 barrel per day joint venture Deer Park, Texas,refinery was restarting a coking unit on Tuesday aftercompleting a six-week overhaul of several units, sourcesfamiliar with plant operations said.
There was also a leak in a line at the refinery on Tuesday,the sources said. No injuries were reported due to the leak. (Reporting by Erwin Seba)