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Kinetic study on liquid sodium–silica reaction for safety assessment of sodium-cooled fast reactor
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Journal Article
Kinetic study on liquid sodium–silica reaction for safety assessment of sodium-cooled fast reactor
2015
Overview
In this study, the kinetic behavior of the sodium (Na)–silica (SiO
2
) reaction was investigated for an assessment method of reactivity/stability of siliceous concrete against the sodium–concrete reaction (SCR) by postulating a severe accidental condition in the sodium-cooled fast reactor (SFR). The reaction behavior was tracked using a differential scanning calorimetry (DSC) equipped with a videoscope for viewing the changes in the sample during the reaction. The reaction was characterized as a partially overlapping multistep process controlled by physico-geometrical reaction scheme. The kinetic behavior in view of the change in the temperature at the maximum reaction rate with heating rate was analyzed using the simplified Kissinger method and the approximated Ozawa method. Further by separating the kinetic data for the overall reaction into five component reaction stages, the kinetic information for the second and third reaction stages was extracted. By comparing the kinetic results, it was revealed that the kinetic results determined from the kinetic data at the maximum reaction rate can be interpreted as is for the major reaction stage (the third reaction stage) controlled by an autocatalytic reaction. In addition, the second reaction stage was characterized as a possible premonitory process for the major reaction stage. Through the comprehensive interpretation of the kinetic results, significance of the kinetic analysis for the Na–SiO
2
reaction using DSC for the reactivity/stability evaluation against SCR and for the safety assessment of SFR is discussed.
Publisher
Springer Netherlands,Springer,Springer Nature B.V
