Study of oxidation effects on HTGR graphite in air ingress accidents condition

Saragi, Elfrida; Himawan, Roziq

doi:10.1063/1.5135522

Cited by 1 publication

(1 citation statement)

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“…In the current fuel compact, each coated fuel particle is embedded within the graphite matrix. To prevent the fuel oxidation in the case of air ingress accident (Saragi and Himawan, 2019), which is considered as the presumable worst event, the cylindrical fuel compact is installed inside the tubular graphite-sleeve. However, the gap between the outer graphite-sleeve and fuel compact impedes heat transfer from the fuel compact to helium coolant.…”

Section: Introductionmentioning

confidence: 99%

Comparison of SiC and graphite oxidation behavior under conditions of HTGR air ingress accident

Nishimura

GUBAREVICH

Yoshida

et al. 2022

Mechanical Engineering Letters

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To improve the heat removal efficiency from the core and achieve the higher power density operation in High Temperature Gas-cooled Reactor, the use of a sleeveless SiC matrix fuel compact shall be proposed. In the present study thermogravimetric test on polycrystalline reaction-sintered SiC and IG-110 graphite was performed to evaluate the oxidation behavior under conditions of air ingress accident. The results showed that graphite oxidation in air was a severe weight loss reaction under elevated temperature. On the contrary, SiC was found to follow passive oxidation mode with a slight weight gain process up to 1400 ℃. Therefore, SiC is suggested as a preferable candidate in comparison to graphite because of its stable anti-oxidation property. The measured reaction rates were well fitted to Deal-Grove model, thus, ideal SiC passive oxidation kinetic was observed. Moreover, the activation energy was determined as 323 kJ/mol for polycrystalline reaction-sintered SiC.

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Section: Introductionmentioning

confidence: 99%