Yang, Yong. Understand the Fission Products Behavior in UCO Fuel Kernels of safety tested AGR2 TRISO Fuel Particles by Using Titan Themis 200 with ChemiSTEM Capability

Principal Investigator
First Name:
Yong
Last Name:
Yang
Institution:
University of Florida
Title:
Associate Professor
Team Members:
Name: Institution: Expertise: Status:
Lingfeng He Idaho National Laboratory TEM, Radiation Effects, Ceramics, Nuclear Fuel Other
Isabella van Rooyen Idaho National Laboratory Ceramics, Cladding, Zirconium, Fission Products, Additive Manufacturing, Grain Boundary, Characterization, SiC, Composites, TRISO, uranium compounds Other
Yong Yang University of Florida Radiation Damage, stress corrosion cracking, X-ray Faculty
Experiment Details:
Experiment Title:
Understand the Fission Products Behavior in UCO Fuel Kernels of safety tested AGR2 TRISO Fuel Particles by Using Titan Themis 200 with ChemiSTEM Capability
Describe the work that you are proposing in detail. Please include as many specifics as possible (e.g., dose, dose rate, ion energy, types of ions, beam line x-ray energy, irradiation temperature, analysis temperature, atmosphere, etc.):
Eight TEM lamellae prepared from two irradiated TRISO fuel particle kernels will be characterizations using a suite of techniques, including BF/DF STEM imaging, selected area electron diffraction, super-X EDS mapping, and EELS mapping.
Technical Abstract
TRISO fuel is considered for multiple applications including high temperature gas reactors, small modular reactors and accident tolerant fuel for Light water reactors. The post-irradiation characterization is highly desired for improving the knowledge in understanding the fuel performance at normal and accident conditions. Providing a qualification data and a pathway for further improvement of the fuel fabrication process for new generation advanced gas reactors, are additional key objectives. In this proposal, we plan to quantify the metallic fission product and determine the fission products crystal structure by using FEI Titan with ChemiSTEM. The proposed TEM work are aimed to complement our previously acquired knowledge using the Tecnai F20, particularly for quantifying the Pd rich fission products and determine the atomistic structures of previously identified intermetallic fission products. The anticipated project outcomes will significantly improve our knowledges in the fuels’ microstructural and elemental evolutions upon different fuel fabrication variants. The project PI is fully committed to meet the NSUF required research schedule and deliverable expectations.