Chevron refinery partially shut

LONDON (Reuters) - Chevron Corp. (CVX.N) had an outage at its 210,000 barrel per day Pembroke refinery which shut down part of the production process last night, a spokesman for the UK Environmental Agency said on Wednesday.

A spokeswoman for the U.S. company confirmed there was a problem with supplying steam to the refinery but was unable to confirm which units were affected.

"We have a problem with the steam plant. We are investigating what's wrong," said Ruth Kent.

She said once the investigation is complete, the company would have a better idea of the long term impact of the outage but said Chevron is continuing to meet contractual requirements for oil products.

The refinery is heavily gasoline oriented, with large-scale exports to the United States.

Traders said Chevron has been selling a large amount of crude and buying prompt gasoline.

(Additional reporting by Janet McGurty)

(Reporting by Margaret Orgill)