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논문 기본 정보

자료유형
학술저널
저자정보
이윤희 (한국과학기술원) BUM HEE CHO (Korea Advanced Institute of Science and Technology) 조남진 (한국과학기술원)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제48권 제3호
발행연도
2016.6
수록면
650 - 659 (10page)

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As a type of accident-tolerant fuel, fully ceramic microencapsulated (FCM) fuel was proposedafter the Fukushima accident in Japan. The FCM fuel consists of tristructural isotropic particlesrandomly dispersed in a silicon carbide (SiC) matrix. For a fuel element with such highheterogeneity, we have proposed a two-temperature homogenized model using the particletransport Monte Carlo method for the heat conduction problem. This model distinguishesbetween fuel-kernel and SiC matrix temperatures. Moreover, the obtained temperatureprofiles are more realistic than those of other models. In Part I of the paper, homogenizedparameters for theFCM fuel in which tristructural isotropic particles are randomly dispersedin the fine lattice stochastic structure are obtained by (1) matching steady-state analyticsolutions of the model with the results of particle transport Monte Carlo method for heatconduction problems, and (2) preserving total enthalpies in fuel kernels and SiC matrix. Thehomogenized parameters have two desirable properties: (1) they are insensitive to boundaryconditions such as coolant bulk temperatures and thickness of cladding, and (2) they areindependent of operating power density. By performing the Monte Carlo calculations withthe temperature-dependent thermal properties of the constituent materials of the FCM fuel,temperature-dependent homogenized parameters are obtained.

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