There are security problems at the troubled San Onofre nuclear plant on the California coast that could result in its owner Southern California Edison (SCE) suffering the pain of violations.
Inspectors reviewed records, observed activities and interviewed personnel during an inspection in May, said Nuclear Regulatory Commission (NRC) officials.
The inspection found apparent violations, but officials withheld details citing security concerns.
The problems cited include failure to develop procedures to monitor security of certain electronic devices at the plant.
An Edison statement said plant officials took care of the before the NRC inspection, and the plant treats all deficiencies seriously, but gave no further details, citing security concerns.
San Onofre has been down for more than four months with because of excessive wear on some equipment.