Journal Article 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, T  ,  Sakamoto, K

6p.Nature Publishing Group , 2016-05-10 , Nature Publishing Group
ISSN:2045-2322
Description
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.
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http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/212046/1/srep25700.pdf

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