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Alternative Igneous Source Term Model for Tephra Dispersal at the Yucca Mountain Repository

Richard Blake Codell

Nuclear Technology / Volume 148 / Number 2 / November 2004 / Pages 205-212

Technical Paper / High-Level Radioactive Waste Disposal /

The Nuclear Regulatory Commission uses the ASHPLUME model in its evaluation of the basaltic volcanism scenario at the possible Yucca Mountain repository. The mixing of magma with the spent-fuel waste form is tied to a reasonable but unverified model that predicts that no dense tephra/fuel particles would form. An alternative model uses a mixing rule that allows the formation of dense tephra/fuel particles that would be transported in the volcanic plume differently. The alternative model shows significant sensitivity to the spent-fuel particle size distribution. However, differences in results between the two models are on average less than a factor of 2.

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