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

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245<br />

GEOLOGIC CONSIDERATIONS<br />

questions above are beyond the scope <strong>of</strong> the generic treatment in this Statement, particu-<br />

larly because cost was not considered an environmental factor and because there are no spe-<br />

cific criteria for depth, length <strong>of</strong> time necessary for containment/isolation, or even what<br />

repository behavior can be considered isolation.<br />

Draft p. 3.1.34<br />

Issue<br />

The comment was made that the effect <strong>of</strong> mining on rock depends on rock type and mining<br />

technique, fracturing can be controlled by existing techniques. The greatest changes occur<br />

within a relatively short time following excavation, and that stress relief in most rock<br />

types decreases dramatically following emplacement <strong>of</strong> supports. (154)<br />

Response<br />

The text has been changed to read "It should be noted that the greatest change in the<br />

rock occurs within a relatively short time following excavation." See also draft<br />

pp. 3.1.30-3.1.31 under Rock Strength and Excavation Stability.<br />

Draft pp. 3.1.34-36<br />

Issue<br />

One comment was that the discussion <strong>of</strong> the effects <strong>of</strong> heat in the waste on repository<br />

design and construction section is not crisp. This section should recognize that if a<br />

realistic position is taken as to cooling time prior to disposal, the heat effects will be<br />

significantly reduced and that they can be further reduced if desired. (154)<br />

Response<br />

The draft Statement discusses a variety <strong>of</strong> waste forms and predisposal options, and<br />

assumes certain conditions for the purposes <strong>of</strong> analysis. This is intended to cover a vari-<br />

ety <strong>of</strong> options and the cooling time is one <strong>of</strong> the factors about which a final decision has<br />

not been made. The Statement does mention decreasing the heat output per unit area by spac-<br />

ing between the canisters and by decreasing the waste density per canister.<br />

Draft p. 3.1.35<br />

Issue<br />

In the last paragraph, the resins used with resin grouted bolts are polyester, not<br />

epoxy. (218-DOI)

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