Extended Elemental Iodine Adsorption by AgZ under Prototypical Vessel Off-Gas Conditions

U.S. regulations will require the removal of ¹²⁹I from the off-gas streams of any used nuclear fuel (UNF) reprocessing plant prior to discharge of the off-gas to the environment. Multiple off-gas streams within a UNF reprocessing plant combine prior to environmental release, and each of these streams contains some amount of iodine. For an aqueous UNF reprocessing plant, these streams include the dissolver off-gas (DOG), the cell off-gas (COG), the vessel off-gas (VOG), the waste off-gas (WOG), and the shear off-gas (SOG). To achieve regulatory compliance, treatment of multiple off-gas streams within the plant must be performed. Of these remaining streams, the VOG is expected to be one of the major contributors to the balance of the residual iodine releases. The VOG will most likely contain iodine at parts-per-billion (ppb*) concentrations.