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Detailed Program
Paper Number : ST-P04
Time Frame : 12:00~13:30
Presentation Date : Friday, 28, November
Session Name : Structural Ceramics & Refractory Materials
Session Chair 1# : -
Session Chair 2# : -
Effect of Cell Size on Thermal Conductivity of UO2 Nuclear Fuel Pellet containing Mo Metallic Micro-cell
Dr. Dong-Joo Kim
Korea Atomic Energy Research Institute
In the nuclear fuel performance of an LWR (Light Water Reactor), the thermal conductivity of a UO2 fuel pellet is one of the most important properties. The steep temperature gradient and high centerline temperature in the fuel pellet results from a low thermal conductivity of UO2, which is a typical ceramic material. The in-reactor performance, integrity, safety and accident tolerance of the nuclear fuel can be significantly affected by the thermal conductivity of the UO2 fuel pellet. The improvement in the thermal conductivity of the UO2 fuel pellet can enhance the fuel performance in various ways – decreased fuel centerline temperature, increased fission gas retention capability, increased pellet dimensional stability, enhanced accident tolerance, etc. To enhance the thermal conductivity of a UO2 fuel pellet, we are developing a UO2-based Mo metallic micro-cell pellet. The UO2-Mo micro-cell pellet with high density as well as a continuous channel of the Mo metallic phase could be successfully fabricated. Above all, the verification of thermal conductivity of the developed pellet is very important. In this work, the effect of the cell size on the thermal conductivity of the UO2-Mo micro-cell pellet was measured and verified.
Acknowledgements : This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2013000720).