The Department of Energy (DOE) released a nuclear safety enforcement letter to National Security Technologies (NSTec) relating to an unplanned employee radiological exposure event during borehole activities at the Nevada Test Site. DOE concluded that violations of 10 C.F.R. 835, Occupational Radiation Protection, occurred when the NSTec Borehole Management Project personnel were preparing to gain access to the wellhead at a post-shot crater in Area 9 at the Nevada Test Site in April 2007, and eight workers were contaminated with plutonium. Problems related to the job hazards analysis, work planning, timely processing of radiological smears, and work controls at the site contributed to the exposures. In light of NSTec’s efforts in the identification of deficiencies, and in consideration of the comprehensive scope of NSTech’s root cause analysis report and subsequent corrective actions, the DOE determined that no formal enforcement action would be taken.