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

Suzuki, Eriko ; Nakajima, Kunihisa ; Osaka, Masahiko

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 $_{2}$ .

Language	:	English
Journal	:	Progress in Nuclear Science and Technology (Internet)
Volume	:	5
Number	:
Pages	:	p.165 - 167
Publication Year/Month	:	2018/11
Meeting title	:	ACTINIDES 2017
Held date	:	2017/07
Location (city)	:	Sendai
Location (country)	:	Japan
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.15669/pnst.5.165
DOI for research data	:
Keywords	:	セシウム化学吸着; セシウム化合物; 再蒸発; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
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Article of JAEA R&D Review	:
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Registration No. : BB20170055
JAEA Abstracts No. : 47001329
Paper Submission No. : 21960

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