The company says the unit automatically shut down and there was no threat to the public. No one was injured.
Plant operators declared an unusual event at 10:11 p.m. Sunday. The company says the fire was extinguished 16 minutes later and the event ended at 11:37 p.m.
An unusual event is the lowest level in the Nuclear Regulatory Commission's emergency classification system.
Oyster Creek is located in Lacey Township, about 60 miles east of Philadelphia and is 38 years old. Its owners are seeking to renew its license.
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