Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 298, Issue 1-2, Pages 125-135Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-3115(01)00577-3
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Deep disposal is considered a safe solution to the management of high-level radioactive waste. The safety is usually demonstrated by means of a performance assessment. This paper discusses the methodological aspects and some of the results obtained for the performance assessment of the disposal of vitrified high-level waste in a clay layer in Belgium. The calculations consider radionuclide migration through the following multi-barrier components, all of which contribute to the overall safety: (1) engineered barriers and the host clay layer, (2) overlying aquifer, and (3) biosphere. The interfaces between aquifers and biosphere are limited to the well and river pathway. Results of the performance assessment calculations are given in terms of the time evolution of the dose rates of the most important fission and activation products and actinides. The role of the glass matrix in the overall performance of the repository is also discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
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