Fundamental research on thermal decomposition behavior of sodium hydride

Kawaguchi, Munemichi   

This study presents the fundamental research on the thermal decomposition behavior of sodium hydride (NaH) in FY2021. This study on the thermal decomposition behavior of NaH was carried out using TG-DTA and FT-IR for the decommissioning of the cold trap in Monju. Due to the weak ionic bonding of Na-H in NaH, the hydrogen is enable to move easily at close to 565K. Upon further heating, the hydrogen desorbs by the thermal decomposition. A simple model using each kinetic rate equations (, , ) can give us the quantitative evaluation of the thermal decomposition behavior of NaH, which tended to overestimated the Na evaporation.