Vermont's only nuclear plant has received a passing grade from federal regulators on a security review, but details are secret.

The Rutland Herald Reports that the vice president for Yankee's site, Michael Columb, received a letter from the Nuclear Regulatory Commission saying it found no problems during a recent security review, completed October 8th.

Plant spokesman Larry Smith calls the results of the inspection a clean bill of health.

The nuclear industry and federal regulators have been stepping up security since the 9/11 attacks. But the efforts have been shrouded in secrecy.