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Professional Paper 1779

Prepared in cooperation with the U.S. Department of Energy under Interagency Agreement DE-AI28-07RW12405

Analogues to Features and Processes of a High-Level Radioactive Waste Repository Proposed for Yucca Mountain, Nevada

By Ardyth M. Simmons, Los Alamos National Laboratory, Los Alamos, New Mexico, and John S. Stuckless, U.S. Geological Survey, Denver, Colorado, with a Foreword by Abraham Van Luik, U.S. Department of Energy

Thumbnail of publication and link to report Front Matter (19.2 MB)

Natural analogues are defined for this report as naturally occurring or anthropogenic systems in which processes similar to those expected to occur in a nuclear waste repository are thought to have taken place over time periods of decades to millennia and on spatial scales as much as tens of kilometers. Analogues provide an important temporal and spatial dimension that cannot be tested by laboratory or field-scale experiments. Analogues provide one of the multiple lines of evidence intended to increase confidence in the safe geologic disposal of high-level radioactive waste. Although the work in this report was completed specifically for Yucca Mountain, Nevada, as the proposed geologic repository for high-level radioactive waste under the U.S. Nuclear Waste Policy Act, the applicability of the science, analyses, and interpretations is not limited to a specific site. Natural and anthropogenic analogues have provided and can continue to provide value in understanding features and processes of importance across a wide variety of topics in addressing the challenges of geologic isolation of radioactive waste and also as a contribution to scientific investigations unrelated to waste disposal.

Isolation of radioactive waste at a mined geologic repository would be through a combination of natural features and engineered barriers. In this report we examine analogues to many of the various components of the Yucca Mountain system, including the preservation of materials in unsaturated environments, flow of water through unsaturated volcanic tuff, seepage into repository drifts, repository drift stability, stability and alteration of waste forms and components of the engineered barrier system, and transport of radionuclides through unsaturated and saturated rock zones.

First posted August 27, 2010

For additional information contact:

Center Director, USGS Geology and Environmental Change Science Center
Box 25046, Mail Stop 980
Denver, CO 80225

http://esp.cr.usgs.gov/

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Suggested citation:

Simmons, A.M., and Stuckless, J.S., 2010, Analogues to features and processes of a high-level radioactive waste repository proposed for Yucca Mountain, Nevada: U.S. Geological Survey Professional Paper 1779, 195 p.



Contents

Abstract

Introduction

Preservation Within the Unsaturated Zone

Repository Drift Stability Analogues

Analogues for the Engineered Barrier System

Seepage Analogues

Unsaturated-Zone Flow and Transport Analogues

Coupled Processes Analogues

Analogues to Saturated-Zone Transport

Applications and Conclusions

Acknowledgments

References

Appendix—Known Caves with Assigned Ages and the Methods of Age Determination


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