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Report No.

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$$_{2}$$.



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