Impact of anisotropy on TRISO fuel performance

Singh, Gyanender; Evans, Jordan A.; Jiang, Wen; Hales, Jason; Novascone, Stephen

doi:10.1016/j.nucengdes.2024.113637

Impact of anisotropy on TRISO fuel performance

Journal Article · Sun Nov 03 00:00:00 EDT 2024 · Nuclear Engineering and Design

DOI:https://doi.org/10.1016/j.nucengdes.2024.113637· OSTI ID:2503496

^[1]; ^[1]; Jiang, Wen ^[2]; ^[1]; ^[1]

Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States); North Carolina State University, Raleigh, NC (United States)

Manufacturing of tristructural isotropic (TRISO) particles involves the deposition of pyrolytic carbon (PyC) and silicon carbide (SiC) layers using the fluidized bed chemical vapor deposition (CVD) process. The CVD process is known to generate polycrystalline layers with crystallographic textures, which imparts anisotropic thermophysical properties to the layers. Past studies have shown the risk for particle failure increases with an increase in anisotropy. The limit beyond which the anisotropy of PyC layers becomes unacceptable due to failure risk has been identified as a high-priority knowledge gap. This work presents a first systematic study on the effects of anisotropic thermal and mechanical properties on TRISO fuel performance. This computational study, performed using the fuel performance code BISON, investigates how the anisotropy in elasticity and thermal properties affect the stresses, temperature, and failure of a TRISO particle. The influence of other factors, such as operating temperature and particle geometry on the anisotropy effects, also has been analyzed. The studies utilize the recently published anisotropic elasticity and thermal behavior models for TRISO PyC and SiC layers implemented using tensors with full anisotropic capability. The spherical TRISO particles with anisotropic properties were found to have greater maximum tensile stress and significantly higher failure probability than the spherical particles with isotropic properties. In conclusion, the fuel performance predicted using these recently developed models was found to be comparable with the performance obtained using the historical models.

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This content will become publicly available on Mon Nov 03 00:00:00 EST 2025

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy Advanced Modeling and Simulation (NEAMS); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2503496

Report Number(s):: INL/JOU-24-76220-Rev000

Journal Information:: Nuclear Engineering and Design, Vol. 430; ISSN 0029-5493

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Impact of anisotropy on TRISO fuel performance

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