Abstract
Phase relations of fuel materials and simulated spent fuels in two Th0 2-MgAl 20 4-A1 20 3 and Zr0 2(Y, Gd)-MgAl 20 4-Al 20 3 systems have been studied to confirm the formation of geologically stable fuels which consist of rock-like phases. The distributions of Pu and fission products (FPs) in fuel materials and simulated spent fuels were investigated by X-ray diffraction and electron probe micro-analysis. In both systems, the fuel materials consisted of three phases of fluorite, spinel and corundum, and Pu was solidified into the fluorite-type phase by making solid solutions. The simulated spent fuels consisted of five phases of fluorite, spinel, corundum, hibonite (MO · 6Al 20 3 and/or M 2O 3 · 11Al 2O 3) and alloy. The lanthanide elements of Nd and Ce in FPs distributed into hibonite and fluorite phases. Alkaline earth elements were mainly solidified into the hibonite phase.
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