Updated

Federal regulators are proposing a $65,000 fine against the operator of a Pennsylvania nuclear plant where security guards routinely napped on the job.

The Nuclear Regulatory Commission announced the fine against Exelon Nuclear on Tuesday after completing a special investigation of the Peach Bottom plant in south-central Pennsylvania.

The NRC says multiple guards were "deliberately inattentive" on several occasions, and the incidents weren't reported to plant supervisors.

Exelon ended its contract with an outside security company for Peach Bottom in 2007 after a videotape surfaced of sleeping guards in a "ready room" at the plant.

Exelon Nuclear spokeswoman Beth Archer says the company will pay the fine. Archer says Exelon's monitoring of plant security has improved since the company established an in-house security force.