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, Z. Stefánka, L. Kövér, I. Cserny, J. Tóth, T. Pintér, J. Schunk

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 2011

Fingerprint

Uranium
Fission products
Stainless Steel
Sorption
Stainless steel
Nuclear Power Plants
Steam
Radioisotopes
Oxides
Adsorption
Monolayers
Spectrum Analysis
Hot Temperature
Boric acid
Water
Tubes (components)
Pressurized water reactors
Steam generators
Voltammetry
Coolants

Keywords

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

ASJC Scopus subject areas

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

Cite this

Accumulation of uranium, transuranium and fission products on stainless steel surfaces II. Sorption studies in a laboratory model system. / Kádár, P.; Varga, K.; Baja, B.; Németh, Z.; Vajda, N.; Stefánka, Z.; Kövér, L.; Cserny, I.; Tóth, J.; Pintér, T.; Schunk, J.

In: Journal of Radioanalytical and Nuclear Chemistry, Vol. 288, No. 3, 06.2011, p. 943-954.

Research output: Contribution to journalArticle

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AU - Németh, Z.

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AU - Stefánka, Z.

AU - Kövér, L.

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