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

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Draft p. 3.1.155<br />

Issue<br />

88<br />

CONSEQUENCE ANALYSIS<br />

Values for southeast New Mexico should not be used in a generic Statement. Certainly<br />

faulting rates <strong>of</strong> 102/yr typical <strong>of</strong> the San Andreas system could be avoided. A reasonable,<br />

"conservative" upper bound for this analysis might be 10- 4 /yr. The discussion on p. 3.1.156<br />

would then conclude that the risk from repository breach by faulting and flooding would be<br />

no greater than the risk from lightning, assuming the rest <strong>of</strong> the analysis is correct -- not<br />

definitely seven orders <strong>of</strong> magintude. (218-D01)<br />

Response<br />

DOE assumes the commenter was referring to a faulting rate <strong>of</strong> 10- /yr (as noted in the<br />

draft) as opposed to 10 2 /yr. In addition, DOE would agree that the rate used is an ultra<br />

conservative one. However, the consequence analysis is generally based on such conserva-<br />

tism. The fault rate identified was documented in the draft Statement as referring to work<br />

done in the Delaware Basin.<br />

Draft p. 3.1.157, Table 3.1.42<br />

Issue<br />

Dose commitments <strong>of</strong> 108 person-rem are estimated to result in 2 x 104 fatal cancers.<br />

The risk associated (including the probability) is much less. (113-EPA)<br />

Response<br />

The DOE agrees that the risk associated with the accident (including probability) is<br />

much less; this: is addressed in Section 5.5.<br />

Draft p. 3.1.158<br />

Issue<br />

Provide a reference for ten dilution factors given and discuss the cause <strong>of</strong> the 50-fold<br />

differences shown. (208-NRC)<br />

Response<br />

The data were derived from Hanford Annual Environmental reports, which represent sev-<br />

eral years data. The differences in dilution factors are due to the adsorptive qualities<br />

<strong>of</strong> certain elements when in contact with suspended river sediment. Those elements with dil-<br />

ution factors <strong>of</strong> 100 are deposited in river sediment and do not reach the estuary. Others<br />

such as 3 H, reflect only the increased river flow rate between the release point and the<br />

estuary.

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