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J. Korean Ceram. Soc. > Volume 47(6); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(6): 590.
doi: https://doi.org/10.4191/kcers.2010.47.6.590
겔침전과 화학증착법에 의한 구형 UO2 입자와 TRISO 피복입자 제조
정경채, 김연구, 오승철, 조문성
한국원자력연구원 수소생산원자로기술개발부 피복입자기술개발과제
Spherical UO2 Kernel and TRISO Coated Particle Fabrication by GSP Method and CVD Technique
Kyung-Chai Jeong, Yeon-Ku Kim, Seung-Chul Oh, Moon-Sung Cho
HTGR Nuclear Fuel Technology Development Division, KAERI
ABSTRACT
HTGR using a TRISO coated particles as nuclear raw fuel material can be used to produce clean hydrogen gas and process heat for a next-generation energy source. For these purposes, a TRISO coated particle was prepared with 3 pyro-carbon (buffer, IPyC, and OPyC) layers and 1 silicone carbide (SiC) layer using a CVD technique on a spherical $UO_2$ kernel surface as a fissile material. In this study, a spherical $UO_2$ particle was prepared using a modified sol-gel method with a vibrating nozzle system, and TRISO coating fabrication was carried out using a fluidized bed reactor with coating gases, such as acetylene, propylene, and methyltrichlorosilane (MTS). As the results of this study, a spherical $UO_2$ kernel with a sphericity of 1+0.06 was obtained, and the main process parameters in the $UO_2$ kernel preparation were the well-formed nature of the spherical ADU liquid droplets and the suitable temperature control in the thermal treatment of intermediate compounds in the ADU, $UO_3$, and $UO_2$ conversions. Also, the important parameters for the TRISO coating procedure were the coating temperature and feed rate of the feeding gas in the PyC layer coating, the coating temperature, and the volume fraction of the reactant and inert gases in the SiC deposition.
Key words: Liquid droplets, Sol-gel, $UO_2$ kernel, TRISO
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