Containment of /sup 220/Rn via adsorption on molecular sieves for HTGR--OGCS
Radon-220 emission presents a potential problem in the reprocessing of nuclear fuels containing /sup 232/U or /sup 232/Th. We have examined a number of molecular sieve substrates capable of delaying this short-lived, gaseous radioisotope and have found that a synthetic hydrogen mordenite is most suitable in attaining decontamination factors (DF's) greater than 10/sup 2/ in a carbon dioxide atmosphere. Low concentrations of NO/sub 2/, SO/sub 2/, I/sub 2/, Kr, Xe, and NH/sub 4/CO/sub 2/NH/sub 2/ have little detectable effect. Moisture, however, causes progressive decrease in the ability of the molecular sieve to delay /sup 220/Rn. This effect is temporary; regeneration of the bed removes water and restores its ability to delay /sup 220/Rn. In laboratory scale experiments, an average DF of 1.5 x 10/sup 3/ was attained with a 3.05-m bed at 12.8 m/min. No evidence was found to indicate that significant transport of /sup 220/Rn daughters from the molecular sieve occurs.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- DOE Contract Number:
- EY-76-C-07-1375
- OSTI ID:
- 7255859
- Report Number(s):
- ICP-1114; TRN: 77-013782
- Country of Publication:
- United States
- Language:
- English
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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
FUEL REPROCESSING PLANTS
GASEOUS WASTES
OFF-GAS SYSTEMS
RADON 220
ADSORPTION
DECONTAMINATION
HTGR TYPE REACTORS
MOLECULAR SIEVES
MORDENITE
RADIOACTIVE WASTE PROCESSING
ADSORBENTS
ALPHA DECAY RADIOISOTOPES
CLEANING
EVEN-EVEN NUCLEI
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HEAVY NUCLEI
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
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MINERALS
NUCLEAR FACILITIES
NUCLEI
PROCESSING
RADIOISOTOPES
RADON ISOTOPES
REACTORS
SECONDS LIVING RADIOISOTOPES
SORPTION
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
ZEOLITES
052001* - Nuclear Fuels- Waste Processing
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