Effects of AP-CITROX decontamination procedure on the surface oxide layer composition of stainless steel originating from the primary circuit of a VVER-type nuclear reactor

Z. Homonnay, A. Vértes, E. Kuzmann, K. Varga, P. Baradlai, G. Hirschberg, J. Schunk, P. Tilky

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10 Citations (Scopus)

Abstract

A real specimen originating form the primary circuit of a VVER-440 type pressurized water cooled nuclear reactor has been studied by Conversion Electron Mossbauer Spectroscopy (CEMS) in order to find out how the AP-CITROX decontamination procedure modifies the structure and composition of the surface oxide layer of stainless steel which is used in the steam generator. Other methods like voltammetry, gravimetry, and SEM-EDAX were also applied to characterize the samples and to help the interpretation of CEMS results. It was found that, in contradiction with expectations, the presence of the surface magnetite layer could not be convincingly identified even on the non-decontaminated sample. This finding together with the relatively weak Mossbauer signals indicated that the surface oxide layer is strongly Fe-depleted. It was also concluded that the upper layer of the bulk steel (under the oxide layer) has an altered composition probably due to irradiation-enhanced diffusion of the metallic constituents. It was established that the AP-CITROX decontamination procedure does not exert detrimental effects on the thickness and composition of the surface oxide layer.

Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume246
Issue number1
DOIs
Publication statusPublished - Oct 30 2000

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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