| 고온가스로 핵연료 중간물질 제조와 분말특성 |
| 정경채, 김연구, 오승철, 이영우 |
| 한국원자력연구소 입자연료개발부 피복입자 핵연료기술개발과제 |
| Preparation of an Intermediate and Particle Characteristics for HTGR Nuclear Fuel |
| Kyung-Chai Jeong, Yeon-Ku Kim, Seung-Chul Oh, Young-Woo Lee |
| HTGR Nuclear Fuel Technology Development Division, KAERI |
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| ABSTRACT |
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In this study, first the ADU gel particle, an intermediate for final $UO_2$ kernel of a HTGR nuclear fuel, was prepared from sol-gel method using the broth solution which was made by mixing of the uranyl nitrate, poly vinyl alcohol and tetra-hydrofurfuryl alcohol. The prepared dried-ADU gel particles were converted to the $UO_2;via;UO_3$ from thermal treatment with the 4% $H_2$ atmosphere. The sizes of the spherical liquid droplets appeared $1900{sim}2100{mu}m$, and the harmony between the flow rate of the broth solution and the frequency and the amplitude of a vibrating system are important factors for the spherical ADU gel particles via the mono size spherical droplets. From the XRD and FT-IR analyses, the prepared ADU gel particles were judged to be a $UO_3{cdot}xNH_3{cdot}yH_2O$ form, and the most important factor during the thermal treatment of the dried-ADU gel particle must be avoided a rapidly heating rate in the range of $180{sim}400^{circ}C$, and the heating rate should be kept below $5^{circ}C/min$. |
| Key words:
$UO_2$ kernel, Sol-Gel, Liquid droplet, Vibration |
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