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Preparation and properties of B$$_{4}$$C for MK-2

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Yamashita, Mitsuo*; Saruwatari, Mitsuyoshi*; Shigi, Tadasuke*; Nishikawa, Akira*; Hara, Masatsugu*

Yamashita, Mitsuo*; Saruwatari, Mitsuyoshi*; Shigi, Tadasuke*; Nishikawa, Akira*; Hara, Masatsugu*

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Boron carbide pellets (B$$_{4}$$C pellets), having 90% relative density, were experimentally fabricated and characterized to be applied to the control rods of the experimental fast reactor "JOYO" MK-II. Raw B$$_{4}$$C pellets were hot-pressed from natural B$$_{4}$$C powder and then finished pellets were prepared by burnishing them to adjust their dimensions. Their dimensions, weights, densities, X-ray diffraction patterns, microscopies, chemical compositions and adsorbed gases were measured. Finished B$$_{4}$$C pellets are concluded to satisfy their requirements such as dimension, weight, density, chemical composition and impurity levels. However, density was presumed to be heterogeneous inside pellets, since heterogeneous distribution of pore was observed under microscope.

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