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

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Draft p. 3.1.8<br />

Issue<br />

(113-EPA)<br />

Response<br />

Issue<br />

224<br />

GEOLOGIC CONSIDERATIONS<br />

Lower water content <strong>of</strong> salt domes compared to bedded salt should be mentioned.<br />

The text has been changed (see Section B.6.1 <strong>of</strong> the final Statement).<br />

Several comments were made regarding water migration through salt beds.<br />

Draft p. 3.1.9--The Statement "... water incorporated in them (salt beds) was trapped<br />

when the beds were formed and does not migrate," is erroneous; fluid inclusions migrate<br />

along thermal gradients. (17, 208-NRC)<br />

Draft pp. 3.1.9 and 3.1.35,--The assertion is made that water incorporated in salt beds<br />

when the beds were formed does not migrate. This should be qualified by reference to<br />

effects <strong>of</strong> elevated temperatures on migration <strong>of</strong> brine. Also, it should be mentioned that<br />

one <strong>of</strong> the problems with salt is that brine contained within the deposit tends to move<br />

toward heat sources, such as radioactive waste. These hot brines can be highly corrosive<br />

to some canister materials and waste forms. (17, 218-D01)<br />

Response<br />

The text has been changed (see Section B.6.1 <strong>of</strong> the final Statement).<br />

Draft p. 3.1.9, Table 3.1.1<br />

Issue<br />

Basalt or granite do not always, or even usually, have a permeability <strong>of</strong> "nil." Shale<br />

minimum permeability is much lower than 10 -4 , perhaps 10 or 10-12ft/yr. Moreover,<br />

the key hydrogeologic parameter for evaluating these rocks as repository hosts is transmis-<br />

sivity, not permeability. Yet, this parameter is omitted. (30, 218-DOI)<br />

Response<br />

The text has been changed (see final Appendix B).

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