Accumulation of radioactive corrosion products on steel surfaces of VVER-type nuclear reactors. II. 60Co

Autor: G. Myburg, Paul Stoddart, Péter Tilky, János Schunk, Gábor Hirschberg, Kálmán Varga, Pál Baradlai
Rok vydání: 2001
Předmět:
Zdroj: Journal of Nuclear Materials. 298:231-238
ISSN: 0022-3115
DOI: 10.1016/s0022-3115(01)00658-4
Popis: Formation, presence and deposition of corrosion product radionuclides (such as 60 Co, 51 Cr, 54 Mn, 59 Fe and/or 110m Ag) in the primary circuits of water-cooled nuclear reactors (PWRs) throw many obstacles in the way of normal operation. During the course of the work presented in this series, accumulations of such radionuclides have been studied at austenitic stainless steel type 08X18H10T (GOST 5632-61) surfaces (this austenitic stainless steel corresponds to AISI 321). Comparative experiments have been performed on magnetite-covered carbon steel (both materials are frequently used in some Soviet VVER type PWRs). For these laboratory-scale investigations a combination of the in situ radiotracer ‘thin gap’ method and voltammetry is considered to be a powerful tool due to its high sensitivity towards the detection of the submonolayer coverages of corrosion product radionuclides. An independent technique (XPS) is also used to characterize the depth distribution and chemical state of various contaminants in the passive layer formed on austenitic stainless steel. In the first part of the series the accumulation of 110m Ag has been investigated. Potential dependent sorption of Ag a ions (cementation) is found to be the predominant process on austenitic steel, while in the case of magnetite-covered carbon steel the silver species are mainly depleted in the form of Ag2O. The XPS depth profile of Ag gives an evidence about the embedding of metallic silver into the entire passive layer of the austenitic stainless steel studied. ” 1999 Elsevier Science B.V. All rights reserved.
Databáze: OpenAIRE
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