PHYSICS OF ATOMIC NUCLEI AND ELEMENTARY PARTICLES, HIGH ENERGY PHYSICS

Study of processes occurring in sodium equipment at nuclear power plants

P. A. Revyakina, I. A. Bessonov, D. I. Zavadskii, Y. V. Kuvshinova, D. O. Pylcova, O. L. Tashlykov

Ural Federal University named after the first President of Russia B. N. Yeltsin

Abstract: Optimisation of scheduled preventive maintenance is a key part of the task of improving the economic component of nuclear energy facilities. Computer modelling allows virtual testing to be carried out, performance to be analysed and system behaviour to be predicted under various conditions. This work describes the modelling of transition processes in the pipelines of the hydrogen indication system in the sodium circulation circuit of the PGN-200M steam generator at the Beloyarsk Nuclear Power Plant using the COMSOL.Multiphysics software package. The behaviour of the simulated object under various environmental conditions and the influence of the thermal insulation layer on the rate of transient processes were determined. To verify the simulation results, a series of direct measurements were carried out, which showed that the average deviation of the temperature in the model from the real values is 10.87%.

Keywords: computer modelling of phase transitions, optimisation of preventive maintenance, sodium, COMSOL.Multiphysics.

Received: 11.08.2025
Revised: 24.10.2025
Accepted: 11.08.2025

DOI: 10.60797/IRJ.2025.160s.26