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

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226<br />

GEOLOGIC CONSIDERATIONS<br />

composition. However, the "Sierra Nevada granites" are shown in the draft Figure 3.1.2.<br />

These are predominantly quartz monzonites. Would this eliminate them from consideration?<br />

(218-D01)<br />

Response<br />

Trace element and minerological compositional differences between granite and closely<br />

related igneous rocks would not be the sole determining factor which would eliminate any<br />

media from consideration. In the case <strong>of</strong> the Sierra Nevada granites, long term site stabil-<br />

ity, resource potential, hydrologic regime, etc., would require detailed evaluation if a<br />

candidate site were selected in that or any other media.<br />

Draft pp. 3.1.10-14<br />

Issue<br />

One commenter was not able to figure out what the maps on these paper are supposed to<br />

show. (30)<br />

Response<br />

The maps are intended to show location <strong>of</strong> potential repository salts, granites, basalts<br />

and shales. These maps appear in Appendix B <strong>of</strong> the final Statement.<br />

Draft p. 3.1.10<br />

Issue<br />

The reference cited (#8) for Figure 3.1.1 is incorrect for this figure. The informa-<br />

tion is not found in that report. However, there is an identical map in Y/OWI/TM 36/3.<br />

This was derived from USGS Bulletin 1148. The original reference should be used especially<br />

since it is readily available to the public whereas the contractor report is not. (208-NRC)<br />

Response<br />

The reference has been corrected to Y/OWI/TM-36/3. See Appendix B <strong>of</strong> the final State-<br />

ment. Contractor reports are available to the general public.<br />

Draft p. 3.1.11, First Paragraph<br />

Issue<br />

The statement is, "Granites are basically unaltered by heat because <strong>of</strong> the high temper-<br />

ature <strong>of</strong> formation." Granites are subject to decrepitation at temperatures above 300°C.<br />

Cracks may also form above this temperature, leading to surface heave, followed by subsi-<br />

dence and cracks propagating to a water-bearing zone. (214)

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