Accumulation of uranium, transuranium and fission products on stainless steel surfaces II. Sorption studies in a laboratory model system

P. Kádár, K. Varga, B. Baja, Z. Németh, N. Vajda, Zs Stefánka, L. Kövér, I. Cserny, J. Tóth, T. Pintér, J. Schunk

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Abstract

Within the frame of a joint project, the accumulation of the uranium and transuranium (TRU) species on some structural materials used at Soviet made VVER-type pressurized water reactors (such as heat exchanger tube of steam generators and stainless steel canister material) has been studied. The experiments were carried out in a laboratory model system. During the sorption studies, boric acid coolants provided by the Paks Nuclear Power Plant (Paks NPP) were circulated for a period of 30 h. Solution and tube samples obtained in the course of above experiments were analyzed by independent methods (α- and γ-spectrometry, ICP-MS, SEM-EDX, voltammetry and XPS). The experimental results reveal that: (i) the surface excess of the TRU nuclides studied is extremely low (less than 1% of a monolayer coverage); (ii) the surface excess of uranium species measured on the SG tube surfaces is significantly higher, after 30 h sorption period (Γsample = 1.0 μg cm-2 U ≅ 3.7 × 10-9 mol cm-2 UO2) exceeds a monolayer coverage; (iii) the mechanistic features of the contamination processes (specific or non-specific adsorption, deposition of colloidal and/or disperse particles) depend decisively upon the nature of the studied radionuclides and the chemical structure and composition of the oxide layer formed on stainless steel surfaces.

Original languageEnglish
Pages (from-to)943-954
Number of pages12
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume288
Issue number3
DOIs
Publication statusPublished - Jun 1 2011

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Keywords

  • Accumulation
  • Alpha-spectrometry
  • ICP-MS
  • SEM-EDX
  • Stainless steel
  • Uranium and transuranium
  • XPS

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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