Chemical and radiochemical analyses of fuel-clad material, fuel-clad corrosion-product films, fuel-clad deposits, and circulating corrosion products for the Yankee and Saxton nuclear power reactors are presented. In the neutral water chemistry of the Yankee Plant, the circulating corrosion products and deposits have similar chemical composition, exhibiting primarily chromium depletion with respect to the base metal; the corrosion film is highly enriched in chromium and depleted in iron relative to the base metal. In the Saxton water chemistry (boric acid with potassium hydroxide added) the circulating corrosion products are similar to the base metal in composition, and correspondingly, the chromium content of the film is significantly lower than that of the Yankee corrosion film. As would be expected, the specific activity of the metallic elements in both cases decreases in the order: clad, film, deposit, and circulating corrosion products. The pronounced decrease in activity from the clad to the film indicates that even the corrosion oxide film is largely deposited rather than originating from the local base metal. From the specific activity of the circulating insoluble corrosion products, it is difficult to explain quantitatively the observed radiation levels external to the reactor cores.