Abstract
A simplifying concept of modelling of transport of dissolved species through a clay backfill from the disposal canister to a fissure in rock, or vice versa, is presented to describe the transport fairly well with a wide range of parameter values. The modelling is an improvement to the previously used simplifying expressions. The new approach is very illustrative and conserves the volume of the clay section under consideration. Conservation of the volume gives the right time dependency in the case of a well mixed volume. The nonstationary phase of transport can thus be modelled using in principle the presented simplifying concept as a starting point. Comparisons of stationary mass transport calculations with previous and present simplifying expressions to more accurate calculations are presented.
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