The NOx System in Homogeneous and Heterogeneous Nuclear Waste | |
Meisel, Dan ; Bentley, Dan ; Camaioni, Donald M. ; Shaw, Wendy S. | |
Pacific Northwest National Laboratory (U.S.) | |
关键词: Oxidizers; Forecasting; Validation; 37 Inorganic, Organic, Physical And Analytical Chemistry; Radioactive Wastes; | |
DOI : 10.2172/834611 RP-ID : EMSP-73832-2001 RP-ID : 834611 |
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美国|英语 | |
来源: UNT Digital Library | |
【 摘 要 】
This project focuses on the development of reliable theoretical and efficient computational descriptions of the chemistry of high-level waste simulants in highly concentrated solution and the experimental validation of this approach. It is an extension of previous work which: (a) Determined the mechanism of H{sub 2} formation in waste simulants allowing quantitative prediction of H{sub 2} generation in nuclear waste storage tanks; (b) Predicted and confirmed NO{sub 2} as a key oxidant in the tanks (c) Determined relative rates of reaction of NO{sub 2} with chelators thus helping to resolve the ''Organic Tanks'' safety issue; (d) Measured rates of NO{sub 2} and NO{sub 2}{sup -} with some model organic radicals; (e) Quantified the redox potentials of two major reductants, NO{sub 2}{sup -} and NO{sub 3}{sup -}; (f) Discovered a new radiolytic route to the reductant NO{sub 3}{sup 2-} and demonstrated its potential persistence in irradiated alkaline aqueous media; (g) Demonstrated that while radiolytic electrons escape from solid suspended silica particles to disrupt the surroundings, holes remain trapped thus storing oxidative equivalents.
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