| 학회 | 한국재료학회 |
| 학술대회 | 2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 | 19권 2호 |
| 발표분야 | C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 | Fabrication of Ceramic Micro-cell UO2 Nuclear Fuel Pellet |
| 초록 | We has designed a Ceramic micro-cell UO2 pellet to enhance the retention ability of highly radioactive and corrosive fission products, especially volatile Cs and I that are very hazardous in terms of the public health. The key idea of Ceramic micro-cell UO2 pellet is to immobilize Cs and I by providing multiple chemical traps inside the pellet and/or reducing their diffusivities. This study shows the ceramic micro-cell UO2 pellet preliminary feasibility for fuel pellet fabrication. UO2 pellets in which the ceramic micro-cell structure was successfully implemented could be fabricated by an adopting conventional liquid phase sintering technique. A powder mixture of UO2 and additives was pressed into green pellets, which were then sintered at an elevated temperature at which the additives for the wall materials formed a liquid phase, penetrating through the grain boundaries and enveloped UO2 grains to make the proposed ceramic micro-cell. It was suggested that SiO2 can chemically trap the volatile fission products of Cs and make relatively stable compounds. We therefore selected several SiO2-based mixed oxides as additive candidates for ceramic cell wall materials. Based on the thermodynamic calculation, we selected several potential elements and their combinations which can form a liquid phase during the sintering of UO2 pellets and spontaneously interact with Cs and/or I during the irradiation. By adding small amounts of cell wall candidate materials in UO2, we can obtain several ceramic micro-cell pellets having high density. |
| 저자 | 김건식, 김동주, 이영우, 오장수, 김종헌, 양재호 |
| 소속 | 한국원자력(연) |
| 키워드 | Nuclear fuel; Micro-cell; Fission product; Chemical trap |
