As a result of the breakdown on April 10, 2003 there was a significant uranium contamination in some technological units of the reactor block 2 of the Paks Nuclear Power Plant (PNPP). The fact is that the uranium nuclides can present in different chemical forms in the boric acid coolant, and the limited pieces of information about the uranium accumulated on the surface enhance the complexity of the problem. To clarify issues above it was necessary to carry out a series of comprehensive studies which allows us to get information about uranium accumulation of the primary cooling circuit. In this talk, we give a brief summary of the uranium chemistry, and discuss some experimental findings of U-accumulation obtained in a semi-plant model system. In the present project, we have worked out an alpha-spectrometric detection procedure which is suitable for the measurement of the activity-concentrations of both liquid- and surface-phase uranium. In addition, we have analyzed the oxidation state of uranium by XPS (X-ray Photoelectron Spectroscopic) method. Maximum of uranium-sorption was measured at pH = 6; the maximum surface excess approaches to a monolayer coverage (assuming sorption of (U02(OH)2)).
|Translated title of the contribution||Uranium accumulation on austenitic stainless steel surfaces|
|Number of pages||8|
|Publication status||Published - Dec 29 2005|
ASJC Scopus subject areas
- Chemical Engineering(all)
- Surfaces, Coatings and Films
- Materials Chemistry