LACEY TOWNSHIP, N.J. (AP) — For the second time in as many months, the U.S. Nuclear Regulatory Commission has fined the owners of a former New Jersey nuclear power plant for security-related violations.

The agency said Wednesday it fined Jupiter, Florida-based Holtec Decommissioning International $50,000 for security violations at the former Oyster Creek nuclear power plant in the Forked River section of Lacey Township.

The plant was one of the oldest in the U.S. when it shut down in 2018.

The fine involved a company employee working as an armorer at the plant.

In an investigation that concluded in March 2021, the NRC determined the armorer “deliberately failed to properly perform required annual material-condition inspections of response unit rifles, and falsified related records.”

The plant has several fortified bunkers from which armed security staff can fight off attackers. The NRC said the violation was the work of “a now-former security superintendent.”