SEOUL, May 23 (Reuters) - South Korea's S-Oil Corp said on Monday it has resumed production at its No.2 residue fluidized catalytic cracking (RFCC) unit after a blast at its Onsan refinery that killed one person last week.

South Korea's third-largest refiner said it plans to resume production at its No.1 paraxylene (PX) unit after scheduled maintenance between June 8 and July 15.

S-Oil, a key exporter of products which is majority owned by Saudi Aramco, has suspended output at units in the city of Ulsan as a precaution since they were near the resulting fire.

(Reporting by Heekyong Yang and Mohi Narayan, Editing by Louise Heavens)