Forced gas flow canister dehydration

Details Forced gas flow canister dehydration Forced gas flow canister dehydration

2006-08-29

2006-08-29

Gravini, S. (Department: 3749)

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

Reexamination Certificate

active

07096600

ABSTRACT:
The present invention provides a method and system for ensuring that cavities used to store radioactive elements are adequately dried without intrusive measuring. In one aspect the invention is a method of drying a cavity loaded with radioactive elements, the loaded cavity having a free volume (VF), a starting vapor pressure (vPS), and a cavity pressure (PC), the method comprising: determining a desired degree of dryness in the cavity in terms of a desired vapor pressure (vPD); cooling a non-reactive gas to a temperature (TC) thereby drying the non-reactive gas; introducing the dry non-reactive gas into the cavity so that the free volume VFof the cavity turns over X times; and removing wet non-reactive gas from the cavity; wherein TCand X are controlled to achieve the desired vapor pressure (vPD) in the cavity. Alternatively, a flow rate (R) can be controlled over time (t) instead of controlling X.

REFERENCES:
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patent: 5453562 (1995-09-01), Swanstrom et al.
patent: 6372157 (2002-04-01), Krill et al.
patent: 6684526 (2004-02-01), Tully
patent: 1 429 344 (2004-06-01), None

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