Characterization of phases in 'crud' from boiling-water reactors by transmission electron microscopy

摘要

This paper reports phases identified in samples of crud (activated corrosion products) from two commercial boilingwater reactors using transmission and analytical electron microscopy and selected-area electron diffraction. Franklinite (ZnFe2O4) was observed in both samples. Hematite (alpha-Fe2O3), crystalline silica (SiO2), a fine-grained mixture of iron oxides probably including magnetite (Fe3O4), hematite (alpha-Fe2O3), and goethite (alpha-FeOOH), and an unidentified highBa, high-S phase were observed in one of the samples. Willemite (Zn2SiO4), amorphous silica, and an unidentified ironchromium phase were observed in the other. Chloride-bearing phases were found in both samples, and are assumed to represent sample contaminants. Because of the small sample volumes and numbers of particles studied and the possibility of contamination, it is not clear whether the differences between the phases observed in the two crud samples represent actual differences in the assemblages formed in the reactors. (C) 2006 Elsevier B.V. All rights reserved.