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タイトルシビアアクシデント解析コードSAMPSONにおけるステンレス鋼へのセシウム化学吸着モデルの改良(共同研究)
翻訳タイトルImprovement of model for cesium chemisorption onto stainless steel in severe accident analysis code SAMPSON (Joint research)
情報提供機関JAEA
著者三輪 周平
著者唐澤 英年
著者中島 邦久
著者木野 千明
著者鈴木 恵理子
著者井元 純平
掲載日2023-01
言語eng
ページ数1p.-32p.
種別report
内容記述The improved model for cesium (Cs) chemisorption onto stainless steel (SS) in the fission product (FP) chemistry database named ECUME was incorporated into the severe accident (SA) analysis code SAMPSON for the more accurate estimation of Cs distribution within nuclear reactor vessels in the TEPCO's Fukushima Daiichi Nuclear Power Station (1F). The SAMPSON with the improved model was verified based on the analysis results reproducing the experimental results which were subjected to the modeling of Cs chemisorption behavior. Then, the experiment in the facility with the temperature gradient tube to simulate SA conditions such as temperature decrease and aerosol formation was analyzed to confirm availability of the improved model to the analysis of Cs chemisorption onto SS. The SAMPSON with the improved model successfully reproduced the experimental results, which indicates that the improved model and the analytical method such as setting a method of node-junction, models of aerosol formation and the calculation method of saturated CsOH vapor pressure can be applicable to the analysis of Cs chemisorption behavior. As the information on water-solubility of Cs deposits was also prerequisite to estimate the Cs distribution in the 1F because Cs can be transported through aqueous phase after the SA, the water-solubility of chemisorbed Cs compounds was investigated. The chemisorbed compounds on SS304 have been identified to CsFeO2 at 873 K to 973 K with higher water-solubility, CsFeSiO4 at 973 K to 1273 K and Cs2Si4O9 at 1073 K to 1273 K with lower water-solubility. From these results, the water-solubility of chemisorbed Cs compounds can be estimated according to the SA analysis conditions such as temperature in the reactor and the CsOH concentration affecting the amount of chemisorbed Cs.
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時間軸情報:燃料デブリ取り出し
URIhttp://f-archive.jaea.go.jp/dspace/handle/faa/251104