Testing of an Iodine and Tritium Capture System for an NO₂-Based Tritium Pretreatment Process

Jubin, Robert Thomas; Greaney, Allison T.; Spencer, Barry B.; Bruffey, Stephanie H.

doi:10.2172/1617811

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Conventional voloxidation has been shown to release >99.9% of the tritium in the fuel but may not release tritium trapped as zirconium hydride deep within the cladding (Uchiyama et al 1992). Quantitative tritium volatilization and its capture on silica gel was demonstrated with tritiated water in the advanced voloxidation process (Jubin et al 2019). October 2023…”

Section: Voloxidationmentioning

confidence: 99%

Technology Development Roadmap for Volatile Radionuclide Capture and Immobilization

Soelberg,

Jubin,

Strachan

et al. 2023

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An "Off-Gas and Waste Forms Strategy Workshop" was held in Washington, D.C. on January 31, and February 1, 2023, to review the current state of the art (baseline) technologies for capturing and immobilizing these volatile radionuclides in waste forms (WFs). The discussions in that workshop were used to develop a roadmap for future research and development to mature technologies that are presently not ready for use in a commercial reprocessing facility and develop and demonstrate technologies that provide more safety, more simplicity, or lower costs compared to the current baseline. Technology Development Roadmap for Volatile Radionuclide Capture and Immobilization iv October 2023demonstration of viable WFs and advancing the TRL through large-scale demonstrations and testing under high-fidelity conditions.Long term R&D (out to 25-100 years) should continue on less mature or even currently unknown technologies to lower the costs and risks of UNF reprocessing. Some workshop participants suggested multiradionuclide sorbents and WFs. These are currently not technically possible considering the differences in the chemical, physical, and radiological properties of the four volatile radionuclides.

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Section: Voloxidationmentioning

confidence: 99%

Technology Development Roadmap for Volatile Radionuclide Capture and Immobilization

Soelberg,

Jubin,

Strachan

et al. 2023

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“…This compound is stable under most industrial conditions, therefore AgZ likely not suitable for regeneration. Jubin et al (2019) attempted regeneration of iodine-loaded AgZ and AgNO 3 -impregnated alumina at 200°C and found that less than 1% of the adsorbed iodine was released over 3 h.…”

Section: Iodine Abatement Experimentsmentioning

confidence: 99%

Abatement of radioiodine in aqueous reprocessing off-gas

et al. 2023

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The reprocessing used nuclear fuel (UNF) releases volatile fission and activation products, including 129I, into the off-gas of a processing plant. Mitigation of the release of vapor phase radionuclides is necessary for meeting regulatory requirements in the United States and other countries. In an aqueous reprocessing plant, volatile radioiodine could be present in several forms, depending on the chemistry of the process used. Inorganic iodine will be the predominate species in any shearing or voloxidation pretreatment off-gas and dissolver off-gas (DOG). Organic iodides such as CH3I, C4H9I, and C12H25I have been proposed to be generated during solvent extraction; thus, these species must be captured from the vessel off-gas (VOG). The abatement of inorganic and organic iodide species to meet United States regulatory requirements has been demonstrated in laboratory experiments using Ag-based solid sorbents. The data presented in this paper includes the effect of gas composition (e.g., the presence of water vapor and NOx), iodine speciation (I2, CH3I, C4H9I, C12H25I), and sorbent bed parameters (e.g., temperature, sorbent age) on complete iodine capture on Ag-mordenite in an aqueous reprocessing plant.

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“…The capture of I species and 3 H was investigated at Oak Ridge National Laboratory in earlier studies. (Greaney et al 2020, Jubin et al 2019. Silver mordenite was identified as an optimal trap for I species.…”

Section: Off-gas Capture Technologiesmentioning

confidence: 99%