Authors:
Z. Homonnay Eötvös Loránd University Department of Nuclear Chemistry Budapest Hungary

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P. Szilágyi Eötvös Loránd University Department of Nuclear Chemistry Budapest Hungary

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E. Kuzmann Eötvös Loránd University MTA-ELTE Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences Budapest Hungary

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K. Varga University of Veszprém Department of Radiochemistry Veszprém Hungary

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Z. Németh University of Veszprém Department of Radiochemistry Veszprém Hungary

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A. Szabó University of Veszprém Department of Radiochemistry Veszprém Hungary

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K. Radó University of Veszprém Department of Radiochemistry Veszprém Hungary

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J. Schunk Paks Nuclear Power Plant Paks Hungary

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P. Tilky Paks Nuclear Power Plant Paks Hungary

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G. Patek Paks Nuclear Power Plant Paks Hungary

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Abstract  

57Fe-conversion electron Mössbauer spectroscopy (CEMS) — a sensitive tool to analyze the phase composition of corrosion products on the surface of stainless steel — was applied to study real specimens from the Paks Nuclear Power Plant, Hungary. The primary circuit side of the heat exchanger tubes was studied on selected samples cut out from the steam generators during regular maintenance. Mostly Cr-and Ni-substituted magnetite, amorphous Fe-oxides/oxyhydroxides as well as the signal of bulk austenitic steel of the tubes were detected. The level of Cr-and Ni-substitution in the magnetite phase could be estimated from the Mössbauer spectra. It is suggested that Cr-Ni substitution occurs simultaneously so that the inverse spinel structure of magnetite is preserved up to a certain limit which appears to be roughly at [Fe3+]tet[Fe2+1/4Ni2+3/4Fe3+1/4Cr3+3/4]octO4. Further decrease of the iron content of this phase results in the formation of nickel chromite of regular spinel structure, with very low Fe content. This transformation may be responsible for the hybrid structure of the protective oxide layer, being substantially accelerated by previously performed, factory developed and proposed AP-CITROX decontamination cycles.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)