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

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Draft p. 3.1.23<br />

Issue<br />

236<br />

GEOLOGIC CONSIDERATIONS<br />

Ground water as a major potable water supply for many western states should be<br />

addressed. (208-NRC)<br />

Response<br />

See draft p. 3.1.48.<br />

Draft p. 3.1.23<br />

Issue<br />

One commenter felt it should be noted that both climate and hydrologic gradients may<br />

change with time. (113-EPA)<br />

Response<br />

For site selection, existing climate and hydrologic conditions describe the area at the<br />

time it is being investigated for use as a potential repository site. If these are favor-<br />

able, the site selection will continue and questions <strong>of</strong> trends or changes, if evident, would<br />

be addressed.<br />

Draft p. 3.1.23<br />

Issue<br />

Research on thermal effects on rock permeability is all right, but should not be over-<br />

stated. It may be more practical to select sites where this effect is not important. (154)<br />

Response<br />

Permeability is emphasized because ground-water is believed to be the most likely agent<br />

to transport waste from a repository and that anything affecting the factors related to<br />

ground-water flow should also be emphasized. Until the effects <strong>of</strong> waste heat on the host<br />

rock are more fully known, it is difficult to say where or for what rock type these effects<br />

are unimportant.<br />

Draft p. 3.1.23<br />

Issue<br />

The consequences <strong>of</strong> drastic changes in the surface water regime should be more care-<br />

fully investigated before asserting that interior drainage is favorable. (208-NRC)

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