During decommissioning planning, the licensee selects the release criteria or Derived Concentration Guideline Levels (DCGLs) to be used for the Final Status Survey. The licensee may select the Nuclear Regulatory Commission (NRC) published screening DCGLs, commonly referred to as "Default DCGLs" or the licensee may choose to develop site-specific DCGLs using computer dose modeling software. Default DCGLs are intended to be concentrations which, if distributed uniformly across a building or soil surface, would individually result in a dose equal to the dose criterion. A licensee may select thee default DCGLs without additional dose modeling. Alternatively, the licensee may use the DandD computer code to develop screening DCGLs not listed in NUREG 1757. The licensee would use the code to determine the dose attributable to a unit concentration of a radionuclide and scale the result to determine the DCGL for the radionuclide.
展开▼
