A dozen more bags of trash sat nearby, awaiting transport to an open landfill where Y-12 workers routinely dump garbage with no bearing on national security. When employees of Babcock & Wilcox Technical Services, Y-12, LLC, the contractor responsible for running the site at that time, poked inside two of these additional bags, they found more top-secret documents.

“(They) then decided not to search any additional containers because they were, given the prior results, presumed likely to contain additional classified information,” a preliminary notice of violation issued Feb. 2 by the Energy Department’s enforcement arm said.

Many of the records discovered that day detailed how the department’s employees and contractors worked with nuclear explosive materials, such as highly-enriched uranium, housed at the Y-12 complex. But it quickly got worse: Further investigation by the National Nuclear Security Administration, which oversees such work, led officials to conclude that nuclear secrets had been thrown away with lax security at the Tennessee plant for more than 20 years.

Read more at Public Integrity