Compositions – Radioactive compositions – Nuclear reactor fuel
Patent
1980-09-11
1984-05-08
Hunt, Brooks H.
Compositions
Radioactive compositions
Nuclear reactor fuel
55 66, 55 75, 55 71, 55 76, 423219, 423230, 423239, B01J 2018, B01D 5304
Patent
active
044473532
ABSTRACT:
Disclosed is a method for selectively removing and recovering the noble gas and other gaseous components typically emitted during nuclear process operations. The method is adaptable and useful for treating dissolver off-gas effluents released during reprocessing of spent nuclear fuels whereby to permit radioactive contaminant recovery prior to releasing the remaining off-gases to the atmosphere. Briefly, the method sequentially comprises treating the off-gas stream to preliminarily remove NO.sub.x, hydrogen and carbon-containing organic compounds, and semivolatile fission product metal oxide components therefrom; adsorbing iodine components on silver-exchanged mordenite; removing water vapor carried by said stream by means of a molecular sieve; selectively removing the carbon dioxide components of said off-gas stream by means of a molecular sieve; selectively removing xenon in gas phase by passing said stream through a molecular sieve comprising silver-exchanged mordenite; selectively separating krypton from oxygen by means of a molecular sieve comprising silver-exchanged mordenite; selectively separating krypton from the bulk nitrogen stream using a molecular sieve comprising silver-exchanged mordenite cooled to about -140.degree. to -160.degree. C.; concentrating the desorbed krypton upon a molecular sieve comprising silver-exchange mordenite cooled to about -140.degree. to -160.degree. C.; and further cryogenically concentrating, and the recovering for storage, the desorbed krypton.
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Rees et al., "Sorption of Krypton and Fast Neutron Irradiation Damage in Synthetic Mordenite and Synthetic Faujasite", Chemical Abstracts, vol. 71 (1969), #64457c.
Chou Chun-Chao
Pence Dallas T.
Esposito Michael F.
Hunt Brooks H.
The United States of America as represented by the United States
Westerdahl Allen F.
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