The Aiken Standard reports that manager David Moody said in an email to employees this week that the information was not ever "improperly distributed" or accessed by a hacker outside SRS.
In March, the U.S. Department of Energy said its inspector general was investigating a security breach that had compromised personal information of at least 12,000 workers at the site near Aiken. Officials said no classified data was part of the information accessed.
The 310-square-mile Savannah River Site once produced plutonium and tritium for atomic bombs. Work there is now focused mostly on research and cleaning up contaminated areas.
Information from: Aiken Standard, http://www.aikenstandard.com
Copyright 2013 The Associated Press.