||Chemical State Mapping of Degraded B4C Control Rod Investigated with Soft X-ray Emission Spectrometer in Electron Probe Micro-analysis.
Kasada, R ,
Ha, Y ,
Higuchi, TSakamoto, K
6p.Nature Publishing Group , 2016-05-10 , Nature Publishing Group
模擬溶融デブリ中のホウ素の化学状態分布の解析に成功－福島第一原子力発電所の廃炉推進への貢献に期待－. 京都大学プレスリリース. 2016-05-17.
B4C is widely used as control rods in light water reactors, such as the Fukushima Daiichi nuclear power plant, because it shows excellent neutron absorption and has a high melting point. However, B4C can melt at lower temperatures owing to eutectic interactions with stainless steel and can even evaporate by reacting with high-temperature steam under severe accident conditions. To reduce the risk of recriticality, a precise understanding of the location and chemical state of B in the melt core is necessary. Here we show that a novel soft X-ray emission spectrometer in electron probe microanalysis can help to obtain a chemical state map of B in a modeled control rod after a high-temperature steam oxidation test.