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For countermeasure against sodium leak, structural concrete is protected by steel liner in a sodium-cooled fast reactor (SFR). However, if considering severe and unexpected accidental condition such as breach of steel liner by intensive sodium leak, the reaction with liquid sodium and concrete potentially may occur. For the purpose of elucidating the mechanism of the sodium-concrete reaction in SFRs, kinetic study of the sodium (Na)-silica (SiO2) reaction has been carried out by Differential Scanning Calorimetry (DSC) technique. The Na-SiO2 reaction temperature was identified from DSC curves. It was found that reactivity of Na-SiO2 reaction is similar with the reaction between Na and aggregate of practical used concrete. Based on the measured reaction temperature, rate constant of Na-SiO2 reaction was obtained. Thermal analysis results indicated that Na-SiO2 reaction could occur under the elevated temperature in the timeframe of sodium-concrete reaction.

Experimental Study on Sodium-Concrete Reaction Mechanism in Sodium-Cooled Fast Reactor