HARRISBURG - Gov. Ed Rendell is steamed over a five-hour wait before officials at the Three Mile Island nuclear power plant told state officials about a radiation leak.

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Rendell's letter sent to top Exelon Corp. executives said it is "totally unacceptable" that plant officials waited so long to report Saturday's accident.

The accident at the central Pennsylvania plant exposed employees to small amounts of radiation.

Government regulators say the public was in no danger, and the accident did not trigger a federally required report to state and local authorities.

Plant officials say ventilation fans in the reactor building unexpectedly switched on during maintenance work and blew radioactive dust out of a reactor cooling system pipe.

A plant spokesman says the company is committed to open communication with authorities.

(Copyright 2009 by The Associated Press. All Rights Reserved.)