UPDATE 2-Shell's Norco, La., refinery operating normally after upsets -sources
(Adds details on units affected by power outage, background on refinery units, paragraphs 5-8)HOUSTON, Jan 13 (Reuters) - Royal Dutch Shell Plc's 225,300 barrel-per-day (bpd) Norco, Louisiana, refinery was operating normally on Monday after severe...
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