Comparison of silver sorbents for application to radioiodine control at the PUREX process facility modification. [Iodine 129]
In continued support of the design of the gaseous radioiodine control system for the PUREX Process Facility Modification (PFM), the Pacific Northwest Laboratory (PNL) conducted laboratory-scale measurements of the performance of four state-of-the-art sorbents for radioiodine in the dissolver offgas (DOG) of a nuclear reprocessing plant. The PFM is a new head-end treatment plant being designed by Westinghouse Hanford Company (WHC) for the PUREX Plant at the Hanford Site. The experiments performed measured the iodine effluent concentration from Norton silver mordenite (NAgZ), Linde silver mordenite (LAgZ), Linde silver faujasite (AgX), and silver nitrate-impregnated silicic acid (AgNO/sub 3/Si) during simulated normal operating conditions in the PFM after three shutdown/startup cycles, and during standby. At normal operating conditions the input gas is expected to have a dew point of 35/degree/C to 40/degree/C and contain 0.1 ..mu..mol I/L, 1 vol% NO, and 1 vol% NO /sub 2/. The sorbent bed would be at 150/degree/C. A shutdown/startup cycle consisted of eliminating iodine and NO/sub x/ from the input gas, cooling the bed to room temperature, stopping gas flow, and restarting the system. During standby conditions the input gas contained no iodine or NO/sub x/, the dew point was at 30/degree/C to 35/degree/C, and the bed temperature remained at 150/degree/C. This experimental study showed that 20 cm beds of NAgZ, LAgZ, and 18 wt% silver AgX could load up to 0.25 mmol I/g sorbent and routinely reduce the iodine concentration in a simulated PFM DOG from 0.1 ..mu..mol I/L to less than the target level of 10/sup /minus/5/ ..mu..mol I/L. In contrast, the AgNO/sub 3/Si unexpectedly failed to achieve this required level of performance, reducing the concentration on a routine basis only to 10/sup /minus/4/ to 10/sup /minus/2/ ..mu..mol I/L. 5 refs., 14 figs., 6 tabs.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6883431
- Report Number(s):
- PNL-6607; ON: DE89000232
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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ADSORBENTS
PERFORMANCE TESTING
DISSOLVERS
OFF-GAS SYSTEMS
FUEL REPROCESSING PLANTS
IODINE
ADSORPTION
AIR POLLUTION CONTROL
PUREX PROCESS
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
FAUJASITE
IODINE 129
MORDENITE
SILVER COMPOUNDS
ZEOLITES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CONTROL
DATA
ELEMENTS
HALOGENS
INFORMATION
INORGANIC ION EXCHANGERS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE ISOTOPES
ION EXCHANGE MATERIALS
ISOTOPES
MATERIALS
MINERALS
NONMETALS
NUCLEAR FACILITIES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
POLLUTION CONTROL
RADIOISOTOPES
REPROCESSING
SEPARATION PROCESSES
SILICATE MINERALS
SORPTION
TESTING
TRANSITION ELEMENT COMPOUNDS
YEARS LIVING RADIOISOTOPES
050800* - Nuclear Fuels- Spent Fuels Reprocessing