|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Diffusion Analysis of Metallic Fission Products in Tristructural-isotropic Coated Fuel Using Representative Diffusion Couples
||Rachel L. Seibert, Tyler Gerczak
|On-Site Speaker (Planned)
||Rachel L. Seibert
Tristructural-isotropic (TRISO) coated particle fuel is a well-established fuel considered for use in a variety of reactor concepts, most notably the high-temperature gas-cooled reactor. Release of select metallic fission products from TRISO has the potential to limit the fuel’s operational lifetime and creates potential concerns for maintenance workers. Planar diffusion couple systems consisting of representative pyrocarbon (PyC) and silicon carbide (SiC) are investigated to conduct diffusion analysis relevant to this release problem, with the intent to provide data for fuel performance models to improve fuel reliability and efficiency. The diffusion couple systems were fabricated using a fluidized-bed chemical vapor deposition technique, and were ion implanted into the PyC with either palladium and silver, silver, europium, or strontium. The influence of temperature, grain structure, and neutron irradiation on the PyC/SiC interface has been examined through electron microscopy and depth profiling techniques and will be discussed here.