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

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Response<br />

376<br />

ALTERNATIVE DISPOSAL CONCEPTS<br />

The range <strong>of</strong> errors will not be determined until the systems analyses are completed<br />

and the models are verified.<br />

Draft p. 3.6.26<br />

Issue<br />

The assumption <strong>of</strong> 0.5 MT <strong>of</strong> HLW per canister is appreciably lower than 2.5 to 3.0 MT<br />

usually assumed for HLW canisters and should be explained. (58)<br />

Response<br />

The assumption <strong>of</strong> 0.5 MT <strong>of</strong> HLW per canister is based on preliminary results from<br />

studies <strong>of</strong> the near-field sediments and canister corrosion, which indicate that canister<br />

interface temperatures <strong>of</strong> approximatey 200-250 0 C should not be exceeded. Reasons are: (1)<br />

sediment mineralogic and flow characteristics are not appreciably altered at these tempera-<br />

tures, and (2) it is postulated from preliminary corrosion data that a canister capable <strong>of</strong><br />

500-year integrity can be obtained if the temperature remains below 250 0 C.<br />

Draft p). 3i6;628'<br />

Issue<br />

"....iidentifying centimeter-size imperfections in the sediment surface and decimetersize<br />

imperfectiions; at depth."<br />

On what. basis were these quantitative criteria developed? Why are such criteria only<br />

here and not: defiined for imperfections in the host media <strong>of</strong> other concepts? (154)<br />

Response<br />

The final criternia for subseabed siting has not been developed and it is unlikely that<br />

identification <strong>of</strong> imperf-ecti-ons <strong>of</strong> this size will be required, even if the capability<br />

exists, unless a definite need is identified. As far as the need for similar criteria in<br />

other concepts, no obvious requirement exists.<br />

Draft p. 3.6.29<br />

Issue<br />

Measurements <strong>of</strong> molecular diffusion coefficients will be needed for near and far-field<br />

transport analysis. (218-001)

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