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

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Draft p. 3.1.17<br />

Issue<br />

273<br />

MULTIBARRIERS FOR DISPOSAL<br />

Several uncertainties exist in the projected behavior <strong>of</strong> the system, such as the philo-<br />

sophy for radionuclide containment, waste form, the host rock, etc. Suggest a discussion<br />

as to how these uncertainties can be overcome. (113-EPA)<br />

Response<br />

The multiple barrier or multi-barrier discussion has been expanded (see Appendix 5.1.2)<br />

from what is in the draft and will add justification for the "defense-in-depth" philosophy<br />

quoted on p. 3.1.17 <strong>of</strong> the draft. The sections "Status <strong>of</strong> Technical Development and R&D<br />

Needs" discuss the uncertainties for each disposal concept and current efforts being made<br />

to resolve them.<br />

Draft p. 3.1.39<br />

Issue<br />

One commenter stated that item 3 under Performance Criteria appears to be a listing <strong>of</strong><br />

conditions requiring consideration rather than criteria. (58)<br />

Response<br />

The intent was to list conditions requiring criteria to be developed; they in them-<br />

selves are not criteria.<br />

Draft p. 3.1.40<br />

Issue<br />

Does the waste package design refer to the container alone, the container plus waste<br />

or the entire system? (113-EPA)<br />

Response<br />

For mined geologic disposal (including drilling) the waste package is described as the<br />

waste (form and material), any material between the waste and canister wall, the canister,<br />

and any overpack material around the canister or between the canister and the host rock.

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