Authors & Affiliations
Alexeev V.V., Borisov V.V., Kamaev A.A., Ganichev N.S., Sutyagin I.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Alekseev V.V. – Chief Researcher, Dr. Sci. (Tech.). Contacts: 1, sq. Bondarenko, Obninsk, Kaluga Region, Russia, 249033. Tel.: +7 (484) 399-42-34; e-mail:
Borisov V.V. – Chief Specialist.
Kamaev A.A. – Deputy Director of Division on the Safety and Engineering of Fast Reactors, Cand. Sci. (Tech.).
Ganichev N.S. – Head of Laboratory.
Sutyagin I.A. – Research Engi-neer, A.I. Leypunsky Institute for Physics and Power Engineering.
Abstract
The article presents the study results of the heterogeneous system sodium – oxygen – hydrogen composition, patterns of mass transfer of sodium – water reaction products in the volume of steam generator. The interaction of all heterogeneous system components, including hydrogen, was taken into account in the calculations. The characteristic features of the effect of solution dilution and steam generator operation mode on the distribution of sodium – water reaction components concentration in sodium are considered and described. In the course of the work, a procedure was developed to calculate the change in the concentration of sodium – water reaction components in sodium along the length of steam generator taking into account the formation and dissolution of hydrogen bubbles. The parameters of the N-532 (sodium) steam generator were taken as the initial data in the calculations. The amount of water used for the formation of hydrogen during the interaction of water with sodium is assumed to be 1/2 of the total amount of water entering sodium. The initial bubble volume is 0.5 cm3, the hydrogen pressure in the bubble is 0.5 MPa. When the formation and dissolution of hydrogen bubbles in sodium are taken into account, the shape of the curves of the dependence of the concentrations of the reaction components on the distance along the height of the steam generator changes, but their general arrangement does not change significantly. The proportion of sodium hydride formed as a result of the dissolution of hydrogen bubbles for the conditions under consideration approaches 30% of its total content in sodium. For 10 mm bubbles, the dissolution time under the considered conditions is about 1.67 s. It is shown that the concentration distribution of sodium – water reaction components in sodium along the length of the tube bundle is mainly affected by solution dilution and insignificantly by the steam generator operation mode (isothermal or non-isothermal). In this case, the dilution of the reaction components in the annulus depends on diffusion processes, mainly on the thermal-hydraulic parameters of the sodium flow.
Keywords
sodium, oxygen, hydrogen bubbles, dissolution, concentration, reaction components, saturation, alkali, temperature, balanced system
Article Text (PDF, in Russian)
UDC 621.039.534
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2022, issue 1, 1:9