Extensive measurements have provided the basis for evaluating the radionuclide concentrations, distributions, inventories, waste classification, and disposal options for activated metal wastes generated during reactor decommissioning. A variety of neutron-activated metal specimens associated with spent fuel assembly hardware from commercial nuclear power stations and pressure vessel steel from the decommissioned Gundremmingen KRB-A reactor were subjected to detailed radionuclide and stable element analyses. Emphasis was placed on the long-lived radionuclides specified in 10CFR61, including 54Mn, 55Fe, 60Co, 59Ni, 63Ni and 94Nb. In addition, it was discovered that much higher concentrations of 93mNb were present in activated Inconel and stainless steel than earlier calculations had predicted. The concentrations of 63Ni, 59Ni, and 94Nb in Inconel components, and 63Ni and 59Ni in stainless steel components were often much greater than the Class C limit, indicating that these materials would have to be disposed of as high level waste. The accuracy of calculational methods for predicting radionuclide concentrations in activated -metal wastes was evaluated by conducting blind comparisons of empirical versus predicted values. This comparison showed that good agreements were achieved for the fueled regions of the fuel assemblies, but at the tops and bottoms of the assemblies the calculated values were, in some cases, significantly in error. The agreement between measured versus predicted radionuclide concentrations for the Gundremmingen pressure vessel steel was good. These evaluations have provided confidence in the calculational methods and have identified problem areas where improvements are warranted.