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Management of Commercially Generated Radioactive Waste - U.S. ...

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Factors that might be considered in evaluating salt include: thermal<br />

conductance, fluid migration toward warm canisters, high acidity when hot,<br />

high plasticity, low sorptive capacity, susceptibility to radiation<br />

damage, permeability evidenced by briecia pipes, and environmental<br />

problems associated with surface storage or disposal <strong>of</strong> salt.<br />

A fifth rock type, tuff, should be added to the other four-granite,<br />

basalt, shale and salt-as a possible candidate host rock for reposi-<br />

tories. If anhydrite is included, its large volume change on hydration<br />

should be considered.<br />

Mobility 4<br />

The mobility <strong>of</strong> wastes in various rock types deserves greater emphasis in<br />

the Statement. Should a canister be breached, the viability <strong>of</strong> the host<br />

rock as a backup barrier directly depends on this mobility. Solubility<br />

under reducing conditions is likely to be dominant in limiting the<br />

long-term migration <strong>of</strong> components from a breached canister.<br />

Sorptlon<br />

Since the sorption characteristics and reactivity <strong>of</strong> host rocks to<br />

radioactive solutes are among the most important properties <strong>of</strong> .the

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