Kinetic behavior of the liquid sodium-calcium carbonate reaction

Koga, Nobuyoshi*; Kikuchi, Shin  

The reaction of liquid Na with CaCO was studied kinetically as a model reaction of the liquid Na with structural concreate by postulating a severe accident in a sodium-cooled fast reactor. The reaction that occurs in the temperature range of 650-850 K was detected by the exothermic DSC peaks. In the case of liquid Na-CaCO powder reaction, four exothermic peaks appeared by overlapping partially. The changes in the distribution of CaCO powder in liquid Na and contact area of the reactants as the reaction advances are the possible reason for the apparent multistep reaction. For the liquid Na-CaCO pellet reaction, the single DSC exothermic peak was observed as the result of the one-dimensional regulation of the reaction geometry.