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Report No.

Thermal analysis experiment for elucidating sodium-water chemical reaction mechanism in steam generator of sodium-cooled fast reactor

Kikuchi, Shin ; Kurihara, Akikazu ; Ohshima, Hiroyuki

For the purpose of elucidating the mechanism of the sodium-water surface reaction in a steam generator of sodium-cooled fast reactors, kinetic study of the sodium (Na)-sodium hydroxide (NaOH) reaction has been carried out by using Differential Thermal Analysis (DTA) technique. The parameters, including melting points of Na and NaOH, transition temperature of NaOH, Na-NaOH reaction temperature, and the decomposition temperature of sodium hydride (NaH) have been identified from DTA curves. Based on the measured reaction temperature, rate constant of sodium monoxide (Na$$_{2}$$O) generation was obtained. Thermal analysis results indicated that Na$$_{2}$$O generation at the secondary overall reaction would be considered during the sodium-water reaction.



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