SINGAPORE, Jan 15 (Reuters) - Thai Oil is planning to shut one of the three crude distillation units (CDU) at its Sriracha refinery complex later on Monday for repairs after production issues cropped up early last week, two sources familiar with the matter said.

The CDU, the largest among the three units, has the capacity to process 165,000 barrels per day (bpd) of oil.

The company could not be immediately reached for comment.

Thai Oil operates a 275,000-bpd refinery near Laem Chabang Port in Sriracha, Chonburi. (Reporting by Trixie Yap and Florence Tan; Editing by Christian Schmollinger)