The Nuclear Regulatory Commission has charged Calvert Cliffs nuclear power plant with a safety violation after an employee "deliberately became inattentive" — meaning he was caught napping — last year in the room housing diesel generators for use in an emergency.

Kory Raftery, spokesman for Constellation Energy Nuclear Group, said Tuesday the employee was promptly dismissed after a supervisor discovered him, and the company does not intend to challenge the NRC's findings.

The federal agency said it appeared to be an isolated incident and classified the infraction as of very low safety significance.

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