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

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Response<br />

228<br />

GEOLOGIC CONSIDERATIONS<br />

This is true. However, weathering and decomposition are generally near surface phe-<br />

nomena, compared to "fresh" rock at 600-1000 meters in depth. Alteration could occur any-<br />

where given the right conditions and causes. The effects <strong>of</strong> waste heat and stress release<br />

by excavation (draft p. 3.1.26) are believed to be <strong>of</strong> more concern.<br />

Draft p. 3.1.11<br />

Issue<br />

The reference sited for Fig. 3.1.2 is incorrect and it could not have been developed<br />

from the information found in Reference 9. However, it appears in Y/OWI/TM-36 and is based<br />

on a diagram in OWI-76-27. Original sources should be used. (208-NRC)<br />

Response<br />

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

Draft p. 3.1.11<br />

Issue<br />

The final Statement should mention horizontal jointing; and other features such as<br />

veins, dikes, vugs, etc. (154)<br />

Response<br />

The sentence--"Joints ... to be blocky or sheet-like on a large-scale, and their orien-<br />

tation may be vertical and intersect at right angles and/or horizontal and subparallel to<br />

the topographic surface."--was added. "The statement--Granite masses may contain dikes,<br />

veins and occasionally fragments <strong>of</strong> other rock material."--was also added to the text.<br />

Draft p. 3.1.12<br />

Issue<br />

One commenter pointed out that chemical reactions also affect shales and the signifi-<br />

cance <strong>of</strong> discontinuities in shale should be discussed. (154)<br />

Response<br />

The text has been changed (see Section 5.1). The effects <strong>of</strong> discontinuities are dis-<br />

cussed on draft p. 3.1.29.

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