The role of Pd in the transport of Ag in SiC |
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| Authors: | EJ Olivier JH Neethling |
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| Affiliation: | 1. Idaho National Laboratory, PO Box 1625, Idaho Falls, ID 83415-6188, USA;2. Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6093, USA;1. Materials Science Program, University of Wisconsin, Madison, WI 53706, USA;2. Engineering Physics Dept., University of Wisconsin, Madison, WI 53706, USA;3. Nanoscale Characterization and Fabrication Laboratory, Virginia Tech, Blacksburg, VA 24061, USA;1. Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, USA;2. Fuel Cycle and Isotopes Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA;3. Nuclear Fuels and Materials Division, Idaho National Laboratory, Idaho Falls, ID, USA;4. Fuel Performance and Development, Idaho National Laboratory, Idaho Falls, ID, USA;1. European Commission, Joint Research Centre, Institute for Transuranium Elements, D-76125 Karlsruhe, Germany;2. Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV), Unidad Saltillo, Industria Metalúrgica 1062, Parque Industrial, Ramos Arizpe 25900, Coahuila, Mexico |
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| Abstract: | This paper presents results in support of a newly proposed transport mechanism to account for the release of Ag from intact TRISO particles during HTR reactor operation. The study reveals that the migration of Ag in polycrystalline SiC can occur in association with Pd, a relatively high yield metallic fission product. The migration takes place primarily along grain boundary routes, seen in the form of distinct Pd, Ag and Si containing nodules. Pd is known to rapidly migrate to the SiC and iPyC interface within TRISO particles during operation. It has been shown to chemically corrode the SiC to form palladium silicides. These palladium silicides are found present along SiC grain boundaries in nodule like form. It is suggested that Ag penetrates these nodules together with the palladium silicide, to form a Pd, Ag and Si solution capable of migrating along SiC grain boundaries over time. |
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