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Total spokeswoman Marie Maitre declined comment on Monday.
The 35,000 bpd reformer and 42,000 bpd naphtha hydrotreater lower power early on Monday, the sources said.
The reformer converts refining low-octane byproducts into high-octane components added to gasoline.
Hydrotreaters reduces sulfur content in motor fuels to comply with US environmental rules.