The turnaround started in late May, she said, without indicating whether the 150,000 barrels per day (bpd) crude distillation unit (CDU) has been shut as part of the work.

An RIM Intelligence report had said the unit was shut on May 30 and was expected to restart in late July.

The Idemitsu spokesperson declined to comment on the report.

(Reporting by Yuka Obayashi; Editing by David Goodman)