ALTERATION OF U(VI)-PHASES UNDER OXIDIZING CONDITIONS

Deditius, A.P. ; Utsunomiya, S. ; Ewing, R.C.

United States. Department of Energy. Yucca Mountain Project Office.

关键词: Elements;    Radioisotopes;    11 Nuclear Fuel Cycle And Fuel Materials;    Trace Amounts;    Nuclear Fuels;   

DOI  :  10.2172/884959
RP-ID  :  NA
RP-ID  :  NA
RP-ID  :  884959

美国|英语

来源: UNT Digital Library

【 摘 要 】

Uranium-(VI) phases are the primary alteration products of the UO{sub 2} in spent nuclear fuel and the UO{sub 2+x}, in natural uranium deposits. The U(VI)-phases generally form sheet structures of edge-sharing UO{sub 2}{sup 2+} polyhedra. The complexity of these structures offers numerous possibilities for coupled-substitutions of trace metals and radionuclides. The incorporation of radionuclides into U(VI)-structures provides a potential barrier to their release and transport in a geologic repository that experiences oxidizing conditions. In this study, we have used natural samples of UO{sub 2+x}, to study the U(VI)-phases that form during alteration and to determine the fate of the associated trace elements.