Three-Dimensional Measurement of TRISO Coated Particle Using Micro Computed Tomography

Abstract

The fuel safety and performance of high-temperature gas-cooled reactor (HTGR) are dependent on the integrity and geometric parameter of Tri-structural Isotropic (TRISO) coated particle. Micro X-ray computed tomography (CT) was used for nondestructive testing and three-dimensional measurement of the particle components which are composed of kernel, buffer layer, inner pyrolytic carbon layer (IPyC), silicon carbide (SiC) layer, and outer pyrolytic carbon (OPyC) layer. The thickness distribution and volume of kernel and coating layers are obtained by constructing 3D volume rendering of TRISO particle. Mean thickness of each layer is calculated for comparison with design value. A comparison between two-dimensional and three-dimensional measurement results is also made. It is found that the thickness distribution of all layers approximately obeys Gaussian distribution. Deviation of the thickness of kernel and coating layers between 3D measurement result and design value is 7.88%, -25.63%, -45.50%, 13.87%, and 14.73%, respectively. The deviation will affect the failure probability of TRISO particle. Obvious difference of the OPyC mean thickness between 3D measurement and 2D measurement is found, which proves that the proposed 3D measurement provides comprehensive information of the particle. However, 2D and 3D measured thickness of the kernel and IPyC layer tend to be similar.

Failure Fraction Calculation of the TRISO-Coated Particle Using X-Ray Computed Tomography

“…e phase-attenuation duality Paganin algorithm (PAD-PA) was used for phase retrieval. CT slices were reconstructed by the filtered back-projection method with 727 projections [13,14]. Amira is a 3D data visualization, analysis, and modelling system [15].…”

Seeing through nuclear fuel: Three-dimensional, nondestructive X-ray microscopy and volumetric analyses of neutron-irradiated TRISO-coated fuel kernels

“…Several studies have employed micro-XCT to image unirradiated or neutron-irradiated TRISO particles bearing surrogate (e.g., Al 2 O 3 ) or fuel (i.e., uranium)-based kernels. Due to the high mass attenuation coefficient of uranium (relative to the typical X-ray energies available with common X-ray tube sources or synchrotron sources), these studies have been limited to characterization of surrogate kernels and surrounding coating layers or, in the case of fuel-bearing particles, only the coating layers [8][9][10][11][12][13][14][15].…”