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

中性子エネルギー分析型手法による模擬溶融炉心物質中のホウ素分布の可視化

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 

Kai, Tetsuya; Abe, Yuta; Matsumoto, Yoshihiro*; Parker, J. D.*; Shinohara, Takenao; Oishi, Yuji*; Nagae, Yuji; Sato, Ikken

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.