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

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DOE/ET-0028, pp. 7.4.24-25<br />

Issue<br />

107<br />

CONSEQUENCE ANALYSIS<br />

TABLE 4.1.1-11 One-Year Dose and 70-Year Dose Commitment to the<br />

Maximum Individual Resulting from a Moderate<br />

Accident During Rail Transport <strong>of</strong> Spent Fuel<br />

Dose, rem<br />

Organ 1-Year 70-Year<br />

Total Body 6.8 x 10- 3 - 2<br />

4.0 x 10<br />

Thyroid 1.2 x 10- 3 - 3<br />

1.3 x 10<br />

Lung 3.4 x 10-1 4.9 x 10-1<br />

Bone 5.4 x 10- 2 1.9 x 10-1<br />

Skin 2.4 x 10 - 3 2.4 x 10- 3<br />

What are the risks <strong>of</strong> escape <strong>of</strong> radionuclides via the fresh airway as a consequence <strong>of</strong><br />

a transportation underground? (208-NRC)<br />

Response<br />

The operational risks associated with underground transportation <strong>of</strong> the waste con-<br />

tainers have not yet been analyzed in detail because a site-specific repository design and<br />

operations schedule are not yet available. However, for this exposure pathway to be impor-<br />

tant, significant quantities <strong>of</strong> waste would have to be either vaporized or crushed into very<br />

fine particles. The repository does not contain either a source <strong>of</strong> intense heat or mech-<br />

anical energy, and thus this pathway is not likely to be important.<br />

DOE/ET-0028, p. 7.4.30, Table 7.4.11<br />

Issue<br />

No estimate <strong>of</strong> occupational risk is included in the accident analyses nor is there any<br />

discussion <strong>of</strong> possible impacts on continued repository operation, repository closure or<br />

retrieval <strong>of</strong> waste already emplaced. For example, what will such impacts be for accident<br />

7.5 or 7.6?<br />

For accident 7.6, the safety system is a failsafe wedge-type braking system on the<br />

cage. What is the maximum allowable braking distance <strong>of</strong> the cage for the expected release?<br />

(208-NRC)<br />

Response<br />

Estimates <strong>of</strong> occupational risks from the canister dropped down the mine shaft accidents<br />

are included in the final Statement. The doses calculated include exposure to airborne<br />

aerosal to a limited number <strong>of</strong> workers in the area during the accidents and doses incurred<br />

during decontamination.

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