Independent Review of Simulation of Net Infiltration for Present-Day and Potential Future Climates Page: 11 of 45
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MASSIF approach deals with these issues by using small grids (30 m x 30 m) and small
time steps (one day).
Simulations of net infiltration using MASSIF were conducted over the 125 km2 domain
encompassing Yucca Mountain under three climate scenarios: Present-Day, Monsoon,
and Glacial Transition. These climates represent the likely range of states for the Yucca
Mountain region and are reasonably justified for the 10,000 years in this study.
3.0 REVIEW PROCESS
To ensure the highest quality and objectivity of the science and technology supporting the
Yucca Mountain Project, OCRWM has adopted a policy of "trust, but verify," in which
external experts in appropriate technical disciplines independently verify and validate key
project work as a matter of routine, before and as part of the acceptance process. In April
2006, OCRWM selected the Oak Ridge Institute for Science and Education (ORISE) at
Oak Ridge Associated Universities in Tennessee to perform this work.
For the MASSIF model developed by SNL, ORISE was tasked with performing an
independent, objective review of the model report and associated results. ORISE would
accomplish this task by engaging the services of recognized experts in infiltration
modeling, climate, and predictive modeling to determine whether the model report and
supporting documentation provide (1) a credible analysis of the infiltration rates
associated with the Yucca Mountain repository for current and future climates and (2) a
transparent and traceable presentation of the infiltration model and associated data sets to
allow outside experts to reproduce the results from the model.
ORISE assembled a review panel of five recognized experts in hydrology, infiltration
modeling, climate, and predictive modeling. Each expert comes from a distinguished
university in the arid Southwestern states surrounding the Yucca Mountain site. Brief
qualifications of the five reviewers are given in Appendix A. The review panel was
charged by ORISE with giving their expert opinion on whether the model report
(1) credibly meets its intended purpose; (2) is transparent, traceable, and reproducible;
and (3) adequately meets nuclear regulatory standards and requirements, as well as
(4) identifying additional work or research that may be needed. The detailed Charge to
Reviewers is given in Appendix B.
The review panel studied the subject report and several supporting documents (listed in
Appendix C) and discussed issues, concerns, and recommendations in a series of
conference calls and at a meeting in Las Vegas. ORISE staff facilitated the interactions
and a technical editor compiled reviewer contributions and comments into report drafts
for circulation and revision by the review panel. The report represents a consensus
opinion of the panel members that emerged through the review process.
The scope of this review included only the Rev 01 infiltration modeling report by Sandia
National Laboratories-the review did not evaluate linkages or relationships with the
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Oak Ridge Institute for Science and Education. Independent Review of Simulation of Net Infiltration for Present-Day and Potential Future Climates, report, August 30, 2008; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc897028/m1/11/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.