Backfill barrier as a component in a multiple barrier nuclear waste isolation system [report]

E.J. Nowak
1980 unpublished
Quantitative estimates of the potential effectiveness of backfill barriers based on a linear sorption node! are presented. Using getters such as clays (known sorbent3), a backfill approximately l-foot-thick can delay 4 5 \ 3 by 10 to 10 years the breakthrough of transuranics. A delay of 10 years is possible for major cationic fission products. These delays can be achieved provided that (1) the distribution coefficient (K , a measure of affinity for sot bed species) for the barrier maternal is
more » ... rrier maternal is equal to or greater than 2000 ml/g for transuranics and 200 ml/g for fission products; (2) the interstitial groundwater velocity through the barrier is limited to J ft/year or less; (3) the effective porosity of the barrier is equal to or less than 0.1; and (4) the physical integrity of the barrier is maintained (no channels or cracks!. Mixtures containing expanding clays such as smectites and other getters, are expected to 3atisfy these criteria.
doi:10.2172/5289120 fatcat:h7nrzukhc5hdjlwnctuz7l37we