EDN: YBBGEY
Authors & Affiliations
Alekseev V.V., Sorokin A.P., Kuzina Yu.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Alekseev V.V. – Chief Researcher, Dr. Sci. (Tech.). Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel. (484) 399-70-00 (доб. 42-34); e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Sorokin A. P. – Chief Researcher, Dr. Sci. (Tech.).
Kuzina Yu.A. – Head of Division, Dr. Sci. (Tech.).
Abstract
A mathematical description of homogeneous and heterogeneous mass transfer of stainless steel corrosion products in sodium circuits is proposed. An experimental determination of the constants characterizing mass transfer at low and high oxygen content in sodium is performed. Experiments on the deposition of corrosion products in a cooled channel with different hydrogen content in sodium show that chromium transfer does not depend on the hydrogen content in sodium at a concentration of 6 ppm and less. At the same time, the effect of hydrogen on nickel transfer is noted. A comparison of corrosion product flux onto the channel walls is performed for different oxygen contents in sodium: 140, 80, 5 ppm. At 730–750 °C, the corrosion product flux onto the channel surface is practically independent of oxygen concentration in the considered concentration range and is about 3 10–8 kg/(m2·s), which can be associated with the decomposition of chromium oxides in this temperature range. With increasing concentration of oxygen in sodium, the flux of corrosion products to the channel surface increases in the range of 600–730 °C. With decreasing sodium temperature below 600 °C and relatively low oxygen content, the flow of deposits to the channel walls increases due to increased crystallization of the dissolved component of corrosion products. Considering the danger of possible disorder of the thermal-hydraulic characteristics of sodium circuits caused by mass transfer of corrosion products, the obtained data can be especially useful for ensuring trouble-free operation of high-temperature nuclear installations.
Keywords
sodium, chromium-nickel steel, corrosion products, chromium oxide, mass transfer, temperature, saturation concentration, oxygen, hydrogen, dispersed system, kinetic equation of coagulation, mass transfer constant
Article Text (PDF, in Russian)
References
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UDC 621.039.534
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2025, no. 4, 4:14
