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

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Response<br />

112<br />

CONSEQUENCE ANALYSIS<br />

The DOE believes that what was done was correct within the limititations <strong>of</strong> the data.<br />

An error <strong>of</strong> a million or more would not change the conclusion that the accidents analyzed<br />

would have an insignificant mathematical expectation <strong>of</strong> societal risk.<br />

Y/OWI/TM-36/21<br />

Issue<br />

The results <strong>of</strong> simplified calculations given in Y/OWI/TM-36/21 show 9Tc exceeding<br />

acceptable concentrations 3 miles from the center <strong>of</strong> the repository 400-600 years after<br />

recharge. Top quote from page 8-5: " 99 Tc, due to its long half life and unity retarda-<br />

tion coefficient exists in all layers <strong>of</strong> the generic stratigraphic columns studies (shale,<br />

granite and basalt) at concentrations near or equal to the source activities. The maximum<br />

source activity for 99 Tc used in this study is approximately 0.2-0.3 Ci/ml.(Section 7.0)<br />

which is at least 103 times greater than an acceptable level. The first arrival <strong>of</strong> 99 Tc<br />

occurs in the near surface layers between 400-600 years after repository decommissioning and<br />

resaturation and at concentrations near or equal to that <strong>of</strong> the repository source activity."<br />

This would appear to indicate unacceptable repository performance. An explanation should<br />

be given <strong>of</strong> how this will be remedied or why this analysis is not believed to indicate a<br />

problem. (208-NRC)<br />

Response<br />

Unacceptable repository performance would result only under a very improbable set <strong>of</strong><br />

events. The scenario is indicative <strong>of</strong> a faulting and groundwater intrusion accident rather<br />

than expected parameters.

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