In a number of nuclear power plant (NPP) applications questions arise as to appearance and development of oscillations in mass flow rate, enthalpy, coolant density in the channels with riser. Density waves oscillations (DWO) are one of the most common kind of self-oscillating processes in the parallel steam-generating channels system. It concerns inter-channel pulsations as well as oscillations in natural convection loops with a periodical space-time density change propagating together with the flow. That is why obtaining an analytical criterion giving the boundary for onset of DWO is of the notable theoretical and practical interest.

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