What are the findings of the NFSS BRA under current exposure scenarios?
Current receptors evaluated included the on-site maintenance worker and trespasser. • On-site Maintenance Worker (Radiological Exposure): The Corps evaluated the current risks to an on-site maintenance worker. The model indicated that with unrestricted access to all areas of the site a maintenance worker could receive an unacceptable radiological dose (defined by the Nuclear Regulatory Commission as 25 mrem/year) due to concentrations of Ra-226 in the surface soil in some areas of the site. The comparison to the NRC’s acceptable dose limit to the public is made for information only; the site does not hold an NRC license and so would not be subject to NRC’s regulations. This finding is based upon an assumption that the on-site maintenance worker has unrestricted access to the entire site and is spending every day exposed to only the most elevated radiological soil contamination present at specific locations on the site. When the risk model was run based upon the maintenance worker being
