Fully Ceramic Microencapsulated fuel in prismatic high-temperature gas-cooled reactors: Sensitivity of reactor behavior during design basis accidents to fuel properties and the potential impact of the SiC defect annealing process

Lu, Cihang; Koyanagi, Takaaki; Katoh, Yutai; Strydom, Gerhard; Terrani, Kurt A.; Brown, Nicholas R.

doi:10.1016/j.nucengdes.2019.02.012

Cited by 19 publications

(3 citation statements)

References 25 publications

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“…It is well known that recovery of radiation defects starts beyond the irradiation temperature [42]. Currently, data relating the kinetics of defect recovery in SiC are limited [43], and experiments specifically simulating accident conditions are required. Finally, simulations of the responses of channel boxes to accident conditions are currently lacking, although simulation is important.…”

Section: Accident Analysismentioning

confidence: 99%

Systematic Technology Evaluation Program for SiC-based BWR Channel Box

Koyanagi

Katoh

2019

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Silicon carbide (SiC) -based accident-tolerant fuel (ATF) cladding of light water reactors (LWRs) has become a topic of great interest in nuclear material development since the Fukushima Dai-ichi Nuclear Power Plant accident. Extensive development of SiC cladding has identified benefits of the concept, including its inherent accident resistance and neutronic performance. Advancements achieved during the development of SiC-based ATF cladding have made it attractive for use in accident-tolerant cores of LWRs. In this document, we consider the use of SiC-based materials to replace the zirconium alloy used for the channel boxes of boiling water reactors. Both accident resistance and prevention of the bowing observed in current grades of channel boxes are needs driving the exploration of a new channel box system.

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Section: Accident Analysismentioning

confidence: 99%

Systematic Technology Evaluation Program for SiC-based BWR Channel Box

Koyanagi

Katoh

2019

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“…To further explore the response of TRISO SiC at relevant accident conditions and understand the transition from active to passive oxidation, this study investigates oxidation conditions between 1200 and 1600°C (1473–1873 K) with

{P}_{{{\rm{O}}}_2}

of 0.2 kPa to expand on prior results 18 . Previous studies 19–21 conducted on the oxidation of SiC layer in TRISO particles in oxygen have been carried out at higher

{P}_{{{\rm{O}}}_2}

, which might be away from reality as the presence of large amounts of matrix graphite materials consumes significant quantities of oxidants via oxidation 22–24 …”

Section: Introductionmentioning

confidence: 99%

“…18 Previous studies [19][20][21] conducted on the oxidation of SiC layer in TRISO particles in oxygen have been carried out at higher 𝑃 O 2 , which might be away from reality as the presence of large amounts of matrix graphite materials consumes significant quantities of oxidants via oxidation. [22][23][24]…”

Section: Introductionmentioning

confidence: 99%

High‐temperature oxidation behavior of the SiC layer of TRISO particles in low‐pressure oxygen

et al. 2023

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Surrogate tristructural-isotropic (TRISO)-coated fuel particles were oxidized in 0.2 kPa O 2 at 1200-1600 • C to examine the behavior of the SiC layer and understand the mechanisms. The thickness and microstructure of the resultant SiO 2 layers were analyzed using scanning electron microscopy, focused ion beam, and transmission electron microscopy. The majority of the surface comprised smooth, amorphous SiO 2 with a constant thickness indicative of passive oxidation. The apparent activation energy for oxide growth was 188 ± 8 kJ/mol and consistent across all temperatures in 0.2 kPa O 2 . The relationship between activation energy and oxidation mechanism is discussed. Raised nodules of porous, crystalline SiO 2 were dispersed across the surface, suggesting that active oxidation and redeposition occurred in those locations. These nodules were correlated with clusters of nanocrystalline SiC grains, which may facilitate active oxidation.These findings suggest that microstructural inhomogeneities such as irregular grain size influence the oxidation response of the SiC layer of TRISO particles and may influence their accident tolerance.

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