Authors & Affiliations
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Alexeev V.V. – Chief Researcher, Dr. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Sorokin A.P. – Deputy Director of Safety Department, Dr. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Varseev E.V. – Engineer-Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
With reference to system sodium–oxygen–steel the mathematical description of physical and chemical processes of corrosion products mass transfer and the matching one-dimensional computation program for modeling of structural materials mass transfer in the sodium contours for various service conditions NPP are developed taking into account chemical interacting. Parametric calculations for model and comparison of the obtained results with experimental data by definition of chromium deposit distributions in the channel heat and mass exchange tubes are carried out at concentration of oxygen in sodium of 80 ppm and 140 ppm. On the basis of comparison the specified values of the constants which characteristic of the chromium mass transfer in the cooled channel, taking into account chemical interacting of chromium with oxygen in sodium have been defined. The experiments were carry out at the sodium facility with purpose to research of the influence of hydrogen on corrosion and mass transfer of structural materials in the sodium loop at hydrogen concentration in sodium equal 6 ppm. Researches of corrosion rate of samples from X18H10T steel have shown that at the hydrogen concentration in sodium of 6 ppm it exceeds the limit the corrosion rate calculated for pure sodium without hydrogen (less than 0.5 ppm hydrogen) a little. Data on distribution of the corrosion products density to walls over channel length which will be correlated with calculated data for chromium in conditions with rather low concentration of oxygen and hydrogen in sodium are obtained. The increase of the nickel flow on a surface of the channel is noted at increase of the hydrogen concentration in sodium up to 6 ppm at a temperature in the channel above 600°C (approximately twice in comparison with sodium of a reactor purity).
reactor, sodium, modelling, experiment, mass transfer, chemical interaction, constants, oxygen, hydrogen, concentration, temperature, structural materials, chromium, corrosion products
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