Blown particles triggered incident

From the Patriot News:

Saturday's radiation leak inside the Three Mile Island containment building occurred when ventilation fans blew irradiated particles around in the reactor's pipes, a plant spokesman says.

The particles were detected by monitors, TMI spokesman Ralph DeSantis said Monday. The incident is under review, but the ventilation system has since been modified so the problem won't happen again, he said.

Workers involved in replacing the plant's steam generators were cutting through the pipes at the time, nuclear officials said.

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