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Shell Norco, Louisiana, refinery upset triggers flaring; no units shut -sources

HOUSTON, Dec 9 (Reuters) - A malfunction in the gasoline-producing unit at Royal Dutch Shell Plc's 225,300-barrel-per-day (bpd) Norco, Louisiana, refinery triggered flaring at the refinery on Monday, said sources familiar with plant operations.

The 112,000-bpd residual catalytic cracking unit (RCCU) remained in operation following the malfunction, the sources said. (Reporting by Erwin Seba; editing by Jonathan Oatis)