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

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Draft pp. 3.1.148-155<br />

Issue<br />

,86<br />

CONSEQUENCE ANALYSIS<br />

Discuss the reasons for the choice <strong>of</strong> 2.8 m3/sec (100 cfs) for water flow through the<br />

breached repository. Identify the flow rate <strong>of</strong> hypothetical River "R" used in transport and<br />

dilution calculations. (208-NRC)<br />

Response<br />

The choice <strong>of</strong> 2.8 m 3 /sec (.100 cfs) was arbitrary. The flow <strong>of</strong> River "R" is<br />

120 m 3 /sec.<br />

Draft p. 3.1.149 and 3.1.155<br />

Issue<br />

The leach rates presented on p. 3.1.149 require further examination. The long-term<br />

leach resistance <strong>of</strong> the spent fuel is 1 x 10-5g/cm2/day and times a fracture factor <strong>of</strong><br />

5 equals 5 x 10-5g/c2/day which is lower than the 10 x 10-5g/cm2/day for vitrified<br />

high-level waste. There is no physical evidence to support a lower leach rate. for spent<br />

fuel. (198)<br />

Response<br />

The leach rate figure <strong>of</strong> 10 x 10- 5 g/cm 2 /day presented for vitrified high-level<br />

waste was a typographical error. The information in the table should have been presented<br />

as follows:<br />

Leach rate Time<br />

1 x 10 - 4 g/cm 2 /day first 10 days <strong>of</strong> leaching<br />

1 x 10 -5 g/cm 2 /day remainder <strong>of</strong> time<br />

See also response below.<br />

Draft p. 3.1.149<br />

Issue<br />

A leach rate <strong>of</strong> 10-4g/cm2/day, applied to a one centimeter cube <strong>of</strong> density 2, would<br />

result in a leaching rate <strong>of</strong> 3 x 10 -4 per day, or approximately 0.1 per year. Is this<br />

the value that was used in the analysis? (113-EPA)

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