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In order to understand the fundamental behavior of metallic fuels, microspheres of U-Zr alloys were prepared and irradiated. The microspheres of about 0.8 mmφ were formed by solidifying fused droplets of U-Zr alloys. Irradiation temperatures were controlled by external electric heating. Burnup reached 1.5 at%. After the irradiation, fractional release of fission-product gases, dimensional change and...
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