Studies on thermal decomposition of sodium hydride in liquid sodium for cold trap regeneration
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Cold traps (CT) are the integral part of liquid sodium coolant circuits of sodium-cooled fast reactors that control hydrogen and oxygen impurities within the threshold levels. The dissolved hydrogen and oxygen impurities in the liquid sodium are trapped as NaH and Na2O in CT. The secondary coolant circuit (SCT) is getting saturated mostly with NaH and needs regeneration in regular intervals of time. Prototype fast breeder reactor (PFBR) at Kalpakkam, India is in the advanced stage of construction. During the regeneration of PFBR SCT, the estimated quantity of hydrogen release is about 93 kg by thermal decomposition of trapped NaH. The decomposition rate of NaH as a function of temperature will render the insight about the hydrogen release rate which will facilitate to plan hydrogen mitigation methodologies. A study of rate of decomposition of NaH as a function of temperature on real time was carried out by measuring the released hydrogen from the process using online hydrogen sensor. Decomposition rate of NaH and hydrogen release rate as a function of temperature were determined. The order of decomposition and the activation energy of NaH as a function of extent of decomposition (α) were determined for the first time
Abstract
Cold traps (CT) are the integral part of liquid sodium coolant circuits of sodium-cooled fast reactors that control hydrogen and oxygen impurities within the threshold levels. The dissolved hydrogen and oxygen impurities in the liquid sodium are trapped as NaH and Na2O in CT. The secondary coolant circuit (SCT) is getting saturated mostly with NaH and needs regeneration in regular intervals of time. Prototype fast breeder reactor (PFBR) at Kalpakkam, India is in the advanced stage of construction. During the regeneration of PFBR SCT, the estimated quantity of hydrogen release is about 93 kg by thermal decomposition of trapped NaH. The decomposition rate of NaH as a function of temperature will render the insight about the hydrogen release rate which will facilitate to plan hydrogen mitigation methodologies. A study of rate of decomposition of NaH as a function of temperature on real time was carried out by measuring the released hydrogen from the process using online hydrogen sensor. Decomposition rate of NaH and hydrogen release rate as a function of temperature were determined. The order of decomposition and the activation energy of NaH as a function of extent of decomposition (α) were determined for the first time