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

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Response<br />

258<br />

GEOLOGIC CONSIDERATIONS<br />

A general discussion <strong>of</strong> the thermal and radiation induced effects on the host rock are<br />

provided in Section 5.2 <strong>of</strong> the final Statement. Calculations <strong>of</strong> subsidence or doming are<br />

dependent upon parameters such as repository design, host rock, waste type, waste form and<br />

package, etc.. Such parameters are <strong>of</strong> a site specific nature and would be more appropri-<br />

ately considered in a site specific evaluation.<br />

Draft p. 3.1.242<br />

Issue<br />

The study <strong>of</strong> rock-waste interactions should include the geochemistry. Mobility <strong>of</strong> a<br />

number <strong>of</strong> radionuclides is strongly affected by the geochemistry (particularly the<br />

oxidation-reduction potential <strong>of</strong> the repository and ground water) and by the potential<br />

presence <strong>of</strong> complexing agents. These should be included in the proposed reasearch<br />

program. (113-EPA)<br />

Response<br />

This concern is presently under study for the Department by the Office <strong>of</strong> Nuclear<br />

<strong>Waste</strong> Isolation (ONWI) through the <strong>Waste</strong> Rock Interaction Technology (WRIT) Program (See<br />

Appendix L <strong>of</strong> final Statement).<br />

Draft p. 3.1.243<br />

Issue<br />

It should be pointed out here that sorption phenomena (or "Kds") are not yet well<br />

understood and characterized. Considerable fundamental and field research is needed in<br />

these areas for both near- and far-field analyses and modeling. (218-DO1)<br />

Response<br />

During preparation <strong>of</strong> the final Statement this section was revised. Section 5.2 <strong>of</strong><br />

the final Statement presents a discussion <strong>of</strong> the current R&D needs; among which the need to<br />

improve data gathering techniques for specfic rock properties and improved modeling methods<br />

are mentioned. R&D projects which are currently underway and are designed to meet these<br />

needs are identified in final Appendix L.2.

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