updated 9/24/2007 7:25:45 PM ET 2007-09-24T23:25:45

Exelon Corp. said Monday it will end its contract with a company that provides security at Peach Bottom nuclear power plant following an investigation of reports that security officers were caught on videotape nodding off or sleeping on the job.

Video footage taken two to six months ago showed the Wackenhut Corp. guards napping while sitting on chairs in a "ready room," which is used as a break room, Exelon Generation Chief Operating Officer Chris Crane said in a statement.

"This is not acceptable and we will not tolerate it," Crane said, although he said the actions did not affect plant safety or security.

Wackenhut provides security for Chicago-based Exelon's 10 nuclear power plants, and Exelon is undertaking a broader review of security at those sites, Crane said.

Reports of inattentiveness on the part of guards at Peach Bottom, which is on the Susquehanna River in south-central Pennsylvania, first surfaced last week. U.S. Nuclear Regulatory Commission officials said last week the agency was increasing inspections at the plant, including unannounced visits at off-hours to check on guards.

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