Authors & Affiliations

Alekseev V.V., Borisov V.V., Perevoznikov S.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Alekseev V.V. – Chief Scientist, Dr. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7(484)399-42-34; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Borisov V.V. – Deputy Head of the laboratory, A.I. Leypunsky Institute for Physics and Power Engineering.
Perevoznikov S.A. – Senior Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.


The object of the study was to determine the equilibrium composition of impurities in sodium after its interaction with water. The steady distribution of the concentrations of the formed components of the water-sodium reaction corresponds to the equilibrium state of the reaction NaOH+2Na=Na2O+NaH. For the case when all the formed hydrogen is interacting with the surrounding sodium, a stoichio-metric equation is written to establish the material balance between the initial reagents and the com-ponents of the resulting reaction in the ensuing nonequilibrium system. That allows the concentration of water in sodium to be related to the initial nonequilibrium concentration of the reaction components that are formed. A system of equations is proposed for the calculation of the equilibrium concentrations of alkali, sodium oxide and sodium hydride in sodium. The equilibrium concentrations of these components are calculated for different water concentration at different sodium temperatures. At low water concentrations in sodium, the sodium temperature practically does not affect the reaction components proportion. The effect of temperature begins to be noticeable when the water concentration in sodium is more than 100 ppm. The change in the equilibrium concentration of alkali is characterized by the fact that for a small water concentration in sodium its value is significantly lower than the concentration of other components, and when the water concentration is increased, the concentration of alkali exceeds the concentration of other components. Comparison of the calculation results with experimental data obtained at the Protva-2 sodium loop is carried out.

sodium, oxygen, hydrogen, concentration, reaction components, water, saturation, alkali, temperature, equilibrium system

Article Text (PDF, in Russian)


UDC 621.039.534

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2018, issue 4, 4:18