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

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82<br />

CONSEQUENCE ANALYSIS<br />

The following definitions <strong>of</strong> minor, moderate, and non-design basis were used.<br />

* Minor - infrequent events with potential for small material release, major equipment<br />

damage, or the creation <strong>of</strong> radiation fields in occupied zones which could result in<br />

occupational exposures exceeding 10 CFR 20 limits (5 rem/yr).<br />

* Moderate - relatively frequent occurrences involving process interruptions with<br />

potential for significant release <strong>of</strong> radioactive or other hazardous materials.<br />

* Non-design basis - events which exceed site criteria.<br />

Site criteria include 1) definition <strong>of</strong> the maximum credible earthquake, surface fault-<br />

ing, floods,- and wind velocities based on historical evidence, local and regional geology,<br />

and expert judgement; 2) local and regional demography; and 3) proximity and definition <strong>of</strong><br />

hazards caused by man.<br />

Draft p. 3.1.137<br />

Issue<br />

The groundwater releases did not appear to include the "two aquifer case," which is<br />

most significant for groundwater releases. This case involves a hydrologic connection<br />

between two aquifers through a repository, with subsequent groundwater transport. The anal-<br />

ysis also appears to consider only release <strong>of</strong> the total radionuclide content, which does not<br />

appear to be a credible or useful form <strong>of</strong> analysis. (113-EPA)<br />

Response<br />

Such a scenario was added to the final Statement (see Section 5.5).<br />

Draft p. 3.1.137<br />

Issue<br />

(218-DI0)<br />

Response<br />

Line 7 is the first mention <strong>of</strong> phosphates. What is the tie-in with salt repositories?<br />

Phosphates are <strong>of</strong>ten found in association with salt deposits as both are the result <strong>of</strong><br />

evaporate deposition. See also p. 3.1.8 <strong>of</strong> draft.

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