Abstract
Recently, extremely high dose rates were detected in the three-layer concrete plugs of the units 2 and 3 at the Fukushima Daiichi Nuclear Power Plant. The high dose rates suggest that there are some trapping effects of radioactive materials on shield plugs when gas species and aerosols (e.g., CsOH, CsI) are released from reactor through the plug layers. To determine the trapping mechanism, concrete, rock-forming aggregates and relevant minerals are pulverized and mixed with CsOH monohydrate, followed by heating at different temperatures to clarify the chemical interaction. The results showed that interactions of CsOH and CaCO3 in concrete occurred even at room temperature to form Cs2CO3(H2O)3. The interaction with aggregates occurred above 100 oC and resulted in the formation of CsAlSiO4. Additionally, amorphous and crystalline SiO2 also interacted with CsOH, and formed CsHSi2O5 at around 250 oC. These results suggest that formation of Cs2CO3(H2O)3 might be one of the main trapping mechanisms at shield plugs because CaCO3 is commonly formed on concrete surface and reacts with CsOH at room temperature.
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