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400728 01: Early morning light shines on the proposed nuclear waste dump site of Yucca Mountain February 7, 2002 at Nellis Air Force Base located approximately 90 miles north of Las Vegas, NV. In January, the U.S. Department of Energy endorsed a plan to transport vast amounts of radioactive waste from nuclear power plants across the nation for burial under Yucca Mountain, where it will take 10,000 years to decay. U.S. President George W. Bush could annouce his support for the plan, which is opposed by many in Nevada, as early as this week. (Photo by David McNew/Getty Images)

The U.S. Energy Department has suspended shipments of low-level radioactive waste from Tennessee to Nevada while it investigates whether the materials were being mislabeled and shipped out of compliance with state or federal regulations for several years.

Department spokeswoman Shaylyn Hynes said in a statement Wednesday that none of the materials shipped as early as 2013 from the Y-12 facility in Tennessee posed any health or safety threats to workers or the general public.

But she said the shipments slated for disposal at the Nevada National Security Site north of Las Vegas were not in compliance with the site’s acceptance criteria and were “potentially mischaracterized” as the wrong category of low-level waste for years.

She says the department’s National Nuclear Security Administration has launched an internal investigation “to determine how this went undetected” for up to six years.