Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 465, Issue -, Pages 488-498Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2015.06.019
Keywords
SiC cladding; LWR corrosion
Funding
- Advanced Fuels Campaign of the Fuel Cycle R&D program in the Office of Nuclear Energy, US Department of Energy
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Assessment of the thermodynamics of SiC corrosion under light water reactor coolant environments suggests that silica formation is always expected in the range of applicable pH and potential. Autoclave testing of SiC-based materials in the absence of ionizing radiation was performed. The kinetics data from these tests, when compared with kinetics of silica dissolution in water and post-exposure characterization of SiC samples, suggest that oxidation of SiC to form silica is the rate-limiting step for recession of SiC in high temperature water. Oxygen activity in water was determined to play an important role in SiC recession kinetics. A simplified model of a power loop shows the effect of silica dissolution from the hot region (resembling fuel) and deposition in the cold regions. (C) 2015 Elsevier B.V. All rights reserved.
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