|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Diffusion of Fission Products in Virgin Nuclear Graphite
||Kevin Graydon, Mikhail Klimov, Edward Dein, Kevin Coffey, Yongho Sohn
|On-Site Speaker (Planned)
The diffusivities of fission products in various grades of nuclear graphite are needed to aid in the design and licensing requirements for the next generation of nuclear reactors. Discussed are the methodologies and the resultant findings of the diffusivities and transport mechanisms of fission products, Ruthenium and Silver, through a graphite collection. The graphite selection encompasses AXF-5Q, ZXF-5Q, IG-110, NBG-18, PCEA, and HOPG. By utilizing the thin film approach and secondary ion mass spectroscopy (SIMS), the diffusivities of the fission products can be experimentally determined. An initial value of the diffusivity of Ruthenium in AXF-5Q at 600°C has been found to be 1.46E-16 ± 6.12E-17 (95%) cm2/s. Based on the preliminary data from the SIMS depth profile, more than one mechanism of diffusion may play a role in Ruthenium transport through the graphite. Diffusion of each fission product in each graphite will be analyzed and compared.