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repository. In this paper, we develop a general approach for a systematic evaluation of microbial impact on the long-term performance of the repository, based on the consideration of environmental constraints on microbial processes. We then apply this approach to both the Yucca Mountain (YM) repository and the Waste Isolation Pilot Plant (WIPP). We demonstrate that the effect of microbial activity on the near-field chemistry in the Yucca Mountain repository is negligible because of limited nutrient supply and harsh environmental conditions created by waste emplacement. Whereas for the WIPP, we show that, due to the presence of a large quantity of organic materials and a significant amount of nutrients in the wastes, a significant microbial activity can potentially be stimulated and its impact on repository performance can be evaluated with carefully designed incubation experiments.

Evaluation of Microbial Activity for Long-Term Performance Assessments of Deep Geologic Nuclear Waste Repositories