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This paper reports on the progress achieved in developing models of various physical and chemical processes within the near-field of a low or intermediate level waste repository. The computer code CHEQMATE has been developed further to study coupled chemistry and ionic transport processes. The numerical method used in the program has been improved recently and models of sorption have been included in the chemical part of the code. A model of the degradation of cement in a repository has been developed using CHEQMATE. In a previous study, the scale of perturbation to the groundwater chemistry surrounding a repository due to the ingress of high pH from the backfill was investigated. The thermodynamic description of clay has been improved and used in a validation exercise for CHEQMATE from information provided by the British Geological Survey. A model of diffusion/sorption experiments through cement has also been developed. This model is intended to provide a framework for modelling transport of sorbing species through cement.

Additional information

Authors: HAWORTH A, AEA Industrial Technology, Harwell Laboratory, Didcot, Oxon. (GB);SHARLAND S M, AEA Industrial Technology, Harwell Laboratory, Didcot, Oxon. (GB);TWEED C J, AEA Industrial Technology, Harwell Laboratory, Didcot, Oxon. (GB)
Bibliographic Reference: EUR 13668 EN (1991) 28 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-3019-6
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