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High-temperature gaseous reaction of cesium with siliceous thermal insulation; The Potential implication to the provenance of enigmatic Fukushima cesium-bearing material

Rizaal, M.   ; Nakajima, Kunihisa  ; Saito, Takumi*; Osaka, Masahiko  ; Okamoto, Koji*

Here we report an investigation of the gas-solid reaction between cesium hydroxide (CsOH) and siliceous (calcium silicate) thermal insulation at high temperature, which was postulated as the origin for the formation mechanism of cesium-bearing material emitted from the Fukushima Daiichi Nuclear Power Plant. A developed reaction furnace consisting of two heating compartments was used to study the reaction at temperatures of 873, 973, and 1073 K. Under the influence of hydrogen-steam atmospheric conditions (H$$_{2}$$/H$$_{2}$$O = 0.2), the reaction between cesium hydroxide vapor and solid thermal insulation was confirmed to occur at temperatures of 973 and 1073 K with the formation of dicalcium silicate (Ca$$_{2}$$SiO$$_{4}$$) and cesium aluminum silicate (CsAlSiO$$_{4}$$). Water-dissolution analyses of the reaction products have demonstrated their stability, in particular, the CsAlSiO$$_{4}$$. Constituents similarity of the field-observed cesium-bearing materials near the Fukushima Daiichi Nuclear Power Plants with CsAlSiO$$_{4}$$ suggests for the first time that gaseous reaction between CsOH with calcium silicate thermal insulation could be one of the original formation mechanisms of the cesium-bearing materials.

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Category:Chemistry, Multidisciplinary

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