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This memo describes a preliminary model that predicts the flow of dissolved nuclear waste in an underground repository. The model is based ou the flow of water that enters regions of the reposi tory in which the waste is actually contained; it is expected to be an improvement over the current ap proach that assumes the waste flow is proportional to total flow of water along various pathways. The repository flow model is intended for implementation in the TASC WASTE computer code.

This report is Volume 3 of a seven volume document on nuclear waste repository design issues. A portion of the work reported in this document was performed by Colder Associates, Inc., under a subcontract to TASC.

This report contains a description of an analysis of a generic nuclear waste repository in bedded salt. This analysis was performed by TASC for inclusion in a major Lawrence Livermore Labora tory report to NRC; this report therefore should be viewed as providing more complete and detailed information about this analysis than was possible to include in the LLL report. r HE ANALYTIC SCIENCES CORPORATION

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