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(Updates with Valero saying no impact to production)

 NEW YORK, Aug 4 (Reuters) - Valero Energy Corp (VLO.N: Quote, Profile, Research, Stock Buzz) said on Monday there was no impact to production from a valveleak near the fluid catalytic cracker unit at its 210,000 barrelper day Delaware City, Delaware refinery.

 "There was a minor leak in our Delaware City refinery that was notunit-related. The event had no impact on production," Teri Levy, aspokeswoman for Valero, said in an email.

 Earlier, Valero said in a filing with Delaware's Department ofNatural Resources and Environmental Control (DNREC) that a valvenear the refinery's cat cracker leaked a total of 150 gallons ofgasoline into a gravel area on Saturday. (Reporting by HaithamHaddadin; Editing by David Gregorio)