The NOx System in Homogeneous and Heterogeneous Nuclear Waste
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چکیده
Research Objective — 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 H2 formation in waste simulants allowing quantitative prediction of H2 generation in nuclear waste storage tanks; b) Predicted and confirmed NO2 as a key oxidant in the tanks c) Determined relative rates of reaction of NO2with chelators thus helping to resolve the "Organic Tanks" safety issue; d) Measured rates of NO2 and NO2 – with some model organic radicals; e) Quantified the redox potentials of two major reductants, NO2 – and NO3 ; f) Discovered a new radiolytic route to the reductant NO3 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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