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Title: TRISO-Coated Fuel Durability Under Extreme Conditions

The PIs propose to examine TRISO-coated particles (SiC and ZrC coatings) in an integrated two-part study. In the first part, experiments will be performed to assess the reaction kinetics of the carbides under CO-CO2 environments at temperatures up to 1800 degree C. Kinetic model will be applied to describe the degradation. Scanning and transmission electron microscopy will be employed to establish the chemical and microstructure evolution under the imposed environmental conditions. The second part of the proposed work focuses on establishing the role of the high temperature, environmental exposure described above on the mechanical behavior of TRISO-coated particles. Electron microscopy and other advanced techniques will be subsequently performed to evaluate failure mechanisms. The work is expected to reveal relationships between corrosion reactions, starting material characteristics (polytype of SiC, impurity concentration, flaw distribution), flaw healing behavior, and crack growth.
Authors:
; ;
Publication Date:
OSTI Identifier:
1154734
Report Number(s):
DOE/NEUP--09-813
TRN: US1500030
DOE Contract Number:
AC07-05ID14517
Resource Type:
Technical Report
Research Org:
Colorado School of Mines, Golden, CO (United States); Boise State Univ., ID (United States)
Sponsoring Org:
USDOE, Nuclear Energy University Programs (NEUP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Coated Fuel Particles; SERVICE LIFE; WEAR RESISTANCE; HARDNESS; SILICON CARBIDES; ZIRCONIUM CARBIDES; CHEMICAL REACTION KINETICS; Temperature Range 1000-4000 K; CARBON DIOXIDE; CARBON MONOXIDE; Mathematical Model; Decomposition; Scanning Electron Microscopy; TRANSMISSION ELECTRON MICROSCOPY; MICROSTRUCTURE; Time Dependence; Mechanical Properties; ENVIRONMENTAL EXPOSURE; CONCENTRATION RATIO; CORROSION; DEFECTS; CRACK PROPAGATION; FAILURES; IMPURITIES; Crystal Lattices