A review of the regulatory history of the Nuclear Regulatory Commission (NRC) regulations applicable to the licensing of a geologic repositiry, as well as a review of NRC administrative (licensing) decisions and federal case law, support the NRC's sue of simplified models, in appropriate circumstances, which privide well-documented and reasonably conservative beounding assumptions, together with the use of expert judegement, natural analogues, and other aids to supplement available information, inreaching its reasonable assurance determination whether the public yhealth and safety will be adequately protected if the Yucca Mountain, Nevada site should be licensed for development as a geologic repository.
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