Making the Postclosure Safety Case for the Proposed Yucca Mountain Repository Page: 4 of 15
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The proposed Yucca Mountain repository will be placed into an unsaturated volcanic
mountain ridge, about halfway between the surface and the water table (Figure 2). Post-
closure safety is dependent on the characteristics of the unsaturated zone through time
(e.g., flow and contaminant transport as climates change), on the characteristics of the
engineered system within that unsaturated zone (e.g., resistance to corrosion and physical
damage and waste form dissolution behavior over time, and stability of the mined
openings as seismic activity occurs), and on the characteristics of the saturated zone o% er
time (elevation of water table, tlo% anfI contaminart transport to the accessible
environment).CA.
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Figure 2. The Proposed Yucca Mountain Repository in its Unsaturated-Zone
Setting (inserts illustrate general location, the engineered system in a drift, and a
conceptual drawing of the automated emplacement scheme).
The quantitative aspects of the post-closure safety case will be based on computer
modeling of the potential evolution of the system over time. These models will account
for the uncertainty that is unavoidably present in estimates of the future behavior of
natural and engineered systems through a Monte Carlo approach in which multiple
simulations will be performed using sampled values of uncertain model inputs. ModelSeptember 5, 2006
4
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Swift, P. & Luik, A.V. Making the Postclosure Safety Case for the Proposed Yucca Mountain Repository, report, August 28, 2006; Las Vegas, Nevada. (https://digital.library.unt.edu/ark:/67531/metadc880166/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.