The assurances came yesterday after federal officials told electricity grid operators about a hacking or phishing campaign that has targeted the energy and manufacturing sectors.
John Keeley, spokesman for the industry's Nuclear Energy Institute, says no reactors operating in the US have been affected.
Keeley adds that if they had, the incidents would have been reported to the Nuclear Regulatory Commission and made public.
He declined further comment, saying the matter is classified.
Scott Aaronson, executive director for security for the Edison Electric Institute, which represents investor-owned power companies, says there has been no impact to systems controlling power grids.
The Department of Homeland Security did not respond to requests for comment.
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