A subcontractor for the National Institute of Occupational Safety and Health issued a report on worker dosimetry issues at Piketon. http://www.cdc.gov/niosh/ocas/pdfs/abrwh/scarpts/sprportsm.pdf
This report includes the first-time revelation that numerous "slow cookers" -- deposits of uranium inside the machinery that approach nuclear criticality -- have occurred at Piketon "since start up [in 1954]." The section that begins on page 76 details evidence for the systematic falsification of worker dose records at Piketon, continuing through the current operating contractor, USEC. No explanation for why this evidence was withheld from the public until 2008.