Conjugate priors for generalized MaxEnt families

Rooyen, Brendan van; Reid, Mark D.

doi:10.1063/1.4903707

Cited by 1 publication

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extrapolation of their data to 1500 C yields approximately 6.0  As a final note in this section, it seems also appropriate to compare the silver diffusivity in zirconium carbide with that in silicon carbide since ZrC is a candidate to replace SiC as a coating material in TRISO fuel particles. However, a direct comparison of these two types of diffusion coefficients is not possible because the published values with SiC exhibit significant scatter up to greater than six orders of magnitude; they vary from virtually zero ( 5  10 -21 m 2 /s) to about 4  10 -15 m 2 /s at 1500 C [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59]. Detailed reviews can also be found in Malherbe [72] and Kim et al [73].…”

Section: Ag Diffusivitymentioning

confidence: 99%

The measurement of silver diffusivity in zirconium carbide to study the release behavior of 110mAg in the ZrC TRISO-coated nuclear fuel particle

Yang

Allen

2016

Journal of Nuclear Materials

View full text Add to dashboard Cite

The tri-structural isotropic (TRISO) coated particle fuel has been developed and used for high temperature gas-cooled reactors (HTGRs). It provides a unique robustness of the first barrier for the fission products. The TRISO fuel particle has typically consisted of a UO 2 or UCO kernel, surrounded by successive layers of porous carbon, dense inner pyrocarbon, silicon carbide, and dense outer pyrocarbon. During operation, however, the SiC layer has been known to release radioactive silver 110m Ag which makes maintenance more difficult and thus costly.Zirconium carbide has been considered as a promising alternative to the SiC fission product barrier. ZrC exhibits high temperature stability and possibly possesses superior Pd resistance, while the retention properties especially for silver have not been adequately studied.To help elucidate the diffusive behavior of silver in the ZrC coating of the TRISO-coated particle, a new diffusion experimental technique, called the encapsulating source method, has been developed by constructing a constant source diffusion couple between ZrC and Ag gas originated from Zr-Ag solid solution. SEM, WDS, EBSD Scanning electron microscopy (SEM), wavelength-dispersive X-ray spectroscopy (WDS), electron backscatter diffraction (EBSD) and optical methods were used to analyze the diffusion couple annealed at 1500 C. The resultant diffusion coefficient of Ag in single-crystalline ZrC 0.84 at 1500 C was experimentally determined to be about 2.8 (± 1.2) × 10 -17 m 2 /s.

show abstract