June 28 (Reuters) - Royal Dutch Shell Plc saidFriday that its 156,400 barrel-per-day refinery in Martinez,California, has returned to normal operations and is now fullyoperational following an unspecified unit upset.
The company had reported a unit upset at the refinery onThursday.
(For refinery outages in the Reuters Oil FundamentalsDatabase see http://bond.views.session.rservices.com/CE/ or goto )
(Reporting by Arpan Varghese in Bangalore; Editing by Gerald E.McCormick)