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Equilibrium Leach Testing of Intermediate Level Waste
Published online by Cambridge University Press: 26 February 2011
Abstract
Experiments examining the leach characteristics of encapsulated Intermediate Level Wastes in repository near-field conditions have been undertaken in the UK since 1982. The Equilibrium Leach Test was developed in order to provide a realistic static leach test for the measurement of equilibrium concentrations and chemical states of individual nuclides within a particular waste, or combination of wastes, and the components of the near-field barriers of a repository, after water has ingressed into the system. The significant components of the near-field ie waste material, waste matrix and repository backfill are equilibrated with water under static conditions.
Results illustrate the high degree of protection afforded by the near-field, which under repository conditions will be complemented by the additional protection of the far-field and the biosphere. Analytical results show that a cement based matrix and cementitious backfill provide the lowest radionuclide concentrations, for long lived radionuclides.
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- Copyright © Materials Research Society 1989