SCRIBA, N.Y. -- A spokesman for the Nuclear Regulatory Commission says a sheen on Lake Ontario has been traced to a small oil spill from the Fitzpatrick Nuclear Power Plant in New York.

The U.S. Coast Guard responded Sunday to a report of a sheen near the plant in Scriba, about 40 miles north of Syracuse.

Neil Sheehan of the NRC tells the Rochester Democrat and Chronicle that plant operator Entergy Corp. found the source of the oil on the roof of a turbine building.

Sheehan says it appears that 20 to 30 gallons of oil leaked from a vent for the hydrogen seal system and entered the lake through a discharge drain.

Sheehan says plant operations weren't affected and Entergy has taken steps to prevent any further discharges.