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Modelling of the Evolution of Porewater Chemistry in a Cementitious Repository

  • A. Haworth (a1), S.M. Sharland (a1) and C.J. Tweed (a1)

Abstract

The current concept for disposal of low- or intermediate-level nuclear waste in the UK includes a largely cementitious backfill. An important factor in determining nuclide release rates from the repository is the pH in the near-field. In this paper, we describe development of a coupled chemistry/transport model of cement degradation and its application in determining the evolution of the chemistry within the repository. In particular, the effect of the cement formulation and interaction with groundwater species on the evolution of the pH is examined. The model is sufficiently flexible to consider a number of different repository scenarios.

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2. Haworth, A., Sharland, S.M. and Tweed, C.J., ‘Modelling of the degradation of cement in a nuclear waste repository’, Proc. 12th Int. Symposium for the Scientific Basis of Nuclear Waste Management, Berlin MRS Vol 127 p 447454 (1988)
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8. Atkinson, A. and Hearne, J.A., ‘An Assessment of the Long Term Durability of Cement in Radioactive Waste Repositories’, Harwell Laboratory Report AERE-R-11465 (1987)

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