Visualization of the boron distribution in simulated melted core material by neutron energy resolving method

甲斐 哲也; 阿部 雄太; 松本 吉弘*; Parker, J. D.*; 篠原 武尚; 大石 佑治*; 永江 勇二; 佐藤 一憲

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The energy resolved neutron imaging system RADEN, installed at the Japan Proton Accelerator Complex (J-PARC), utilizes short-pulsed neutrons in the energy range from meV to keV by means of the time-of-flight method. The wide neutron energy range makes it possible to adjust neutron attenuation of a sample to suit a particular measurement by selecting the neutron energy range. The Core Material Melting and Relocation (CMMR) experiments have been performed to investigate core melt accidents in the Fukushima-Daiichi (1F) Nuclear Power Plant. Some amount of boride was found to be contained in simulated melted core material. The authors show the status of the development of a method utilizing energy-resolved neutrons, and demonstrate some measurements of boron-containing samples, including simulated melted core material.