Abstract
In order to evaluate the fluid flow, heat transfer, and ion migration rates within a postulated sub-seafloor waste disposal site, preliminary calculations and computer aided simulations were performed. A base case site description was formulated and a representative set of physical parameters were defined. This information was used in an advanced transport computer code developed by Intera Environmental Consultants to simulate, in detail, site behavior. The simulation studies were divided into an initial short term heat transfer study (Case 1) followed by a long term ion migration simulation (Case 2). Results for the Case 1 heat transfer studies showed that very high canister surface temperatures were reached within a few days and that a convective flow cell was clearly established; however, its effect was minimal in lowering canister temperatures. In the second case, the calculations showed that the transient convective flow cell strongly influences ion migration rates; however, this effect decreases directly as the heat generation rate of the waste in the canister decays. This mechanism for ion transport becomes unimportant after about 1000 years.
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