Atomero″u″vi go″zfejleszto″k kémiai mentesítése III. Dekontaminációs technológiák korróziós és felületkémiai hatásainak összehasonlító elemzése

Translated title of the contribution: Chemical decontamination of steam generators used in nuclear power plants III. Comparative study of the corrosion and surface analytical effects of the decontamination technologies

Baja Bernadett, Horváthné Deák Emese, Berkesi Kata, Varga Kálmán, Radó Krisztián, Németh Zoltán, Szeiler Gábor, Nagyné Szabó Andrea, Oravetz Dezso, Schunk János, Patek Gábor, Baradlai Pái

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Our earlier publications have revealed that version of the AP-CITROX technology applied for chemical decontamination of the steam generators (SGs) of the Paks NPP was not adequately developed considering its chemical, analytic and corrosion aspects. To replace the AP-CITROX procedure, novel "soft" chemical decontamination technologies have been elaborated at the Institute of Radiochemistry and Radioecology of the University of Pannonia. Present paper deals with the comparative study of the corrosion and surface chemical effects of the novel chemical decontamination technologies. The chemical composition and morphology of the oxide layer formed on the inner side of the austenitic stainless steel specimens before and after the full decontamination process were studied by scanning electron microscopy (SEM), equipped with an energy dispersive X-ray microanalyzer (EDX). The passivity of the inner surfaces of the stainless steel samples was studied by voltammetry. The full decontamination cycle has been performed under laboratory conditions in a pilot plant circulation system elaborated earlier. In various steps of the chemical procedure the concentration of the main alloying components (Fe, Cr, Ni) dissolved from the surface oxide layer into the decontamination solutions was determined by ICP optical emission spectrometric (ICP-OES) method. Based upon the ICP-OES results the average thickness of the oxide layer removed from the surface into the solutions was calculated. The activity concentrations of the radionuclides (60Co, 58Co, 110Ag, 54Mn) measured in the decontamination solutions allow us to draw conclusions concerning the efficiency of the main steps of the technology and depth distribution of the radionuclides on the treated steel surfaces.

Original languageHungarian
Pages (from-to)119-129
Number of pages11
JournalKorrozios Figyelo
Volume49
Issue number6
Publication statusPublished - Dec 1 2009

    Fingerprint

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Bernadett, B., Emese, H. D., Kata, B., Kálmán, V., Krisztián, R., Zoltán, N., Gábor, S., Andrea, N. S., Dezso, O., János, S., Gábor, P., & Pái, B. (2009). Atomero″u″vi go″zfejleszto″k kémiai mentesítése III. Dekontaminációs technológiák korróziós és felületkémiai hatásainak összehasonlító elemzése. Korrozios Figyelo, 49(6), 119-129.