Analysis of fission product distribution and composition in the TRISO layers of AGR-2 fuel

•More fission product diversity in IPyC/SiC layers for higher temperature compacts.•Temperature is a primary driver for fission product transport across the SiC layer.•Palladium is observed to lead uranium in the SiC layer of as‑irradiated compacts. The Advanced Gas Reactor Fuel Qualification and De...

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Bibliographic Details
Published in:Nuclear engineering and design 2020-08, Vol.364 (C), p.110656, Article 110656
Main Authors: Gerczak, Tyler J., Hunn, John D., Morris, Robert N., Montgomery, Fred C., Skitt, Darren J., Baldwin, Charles A., Dyer, John A., Eckhart, Brian D.
Format: Article
Language:English
Subjects:
Accident conditions
Actinides
Advanced Gas Reactor
Coated particles
Composition
Fission product transport
Fission products
Fuels
High temperature
Irradiation
Nuclear engineering
NUCLEAR FUEL CYCLE AND FUEL MATERIALS
Nuclear fuels
Nuclear safety
Post-irradiation
Post-irradiation examination
Product safety
Radioisotopes
Scanning electron microscopy
Silicon carbide
Temperature
TRISO
X-ray spectroscopy
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Summary:•More fission product diversity in IPyC/SiC layers for higher temperature compacts.•Temperature is a primary driver for fission product transport across the SiC layer.•Palladium is observed to lead uranium in the SiC layer of as‑irradiated compacts. The Advanced Gas Reactor Fuel Qualification and Development Program's second irradiation experiment focuses on the performance of fuel particles produced in an industrial-scale coating system. Ongoing post-irradiation examination efforts include exploration of tristructural-isotropic (TRISO)-coated particle fuel in the as-irradiated state and subjected to elevated temperatures to simulate accident conditions (safety testing). Scanning electron microscopy (SEM) analysis with energy dispersive x-ray spectroscopy (EDS) was used to show the distribution of fission products within the TRISO layers. The SEM analysis showed a variation of fission product distribution within the TRISO layers based on irradiation temperature, burnup, individual particle fission product inventory retention, safety testing history and kernel composition. A key observation is that particles which likely experienced higher temperature showed a greater diversity and distribution of fission products and actinides in the IPyC and SiC layers, implying that temperature is a dominant variable influencing the transport of radionuclides in TRISO particles.
ISSN:0029-5493
1872-759X
DOI:10.1016/j.nucengdes.2020.110656