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Journal Articles

Effect of atmosphere on the vaporization behavior of CsFeSiO $_{4}$

Suzuki, Eriko; Nakajima, Kunihisa; Osaka, Masahiko

Progress in Nuclear Science and Technology (Internet), 5, p.165 - 167, 2018/11

https://doi.org/10.15669/pnst.5.165

In severe accident condition, CsFeSiO $_{4}$ could be formed by Cesium (Cs) chemisorption onto reactor structural materials. For evaluation of re-vaporization behavior, effect of atmosphere on the vaporization behavior of CsFeSiO $_{4}$ at high temperature was investigated by thermal gravimetric-differential thermal analyzer (TG-DTA) experiments. As a result, it was found that vaporization of CsFeSiO $_{4}$ in reducing atmosphere (Ar-5%H $_{2}$ ) started at relatively low temperature, about 800 $^{circ}$ C, compared with in atmosphere containing H $_{2}$ O (Ar-5%H $_{2}$ -5%H $_{2}$ O). It was inferred that a possible chemical reaction for the weight loss at around 800 $^{circ}$ C would occurred by the decomposition of CsFeSiO $_{4}$ into volatile Cs vapor species under H $_{2}$ .

Oral presentation

Thermodynamic property of cesium-silicates

Suzuki, Eriko; Nakajima, Kunihisa; Osaka, Masahiko; Oishi, Yuji*; Muta, Hiroaki*; Kurosaki, Ken*

no journal, ,

In LWR severe accident condition, Cesium(Cs)-silicates (CsFeSiO $_{4}$ , Cs $_{2}$ Si $_{2}$ O $_{5}$ , Cs $_{2}$ Si $_{4}$ O $_{9}$ ) could be formed by Cs chemisorption onto reactor structural materials. For evaluation of chemisorption/re-vaporization behaviour, thermal property of each Cesium-silicates were investigated by low temperature heat capacity measurement. As a result, actual measurement values of standard entropy, which have evaluated by estimate values, were obtained. Especially for Cs $_{2}$ Si $_{4}$ O $_{9}$ , more reliable value of standard formation Gibbs energy was able to be evaluated.