A Study of Nitrogen-16 Isotope Transport Time Calculation in Steam Generator

To calculate the transport time of ¹⁶N isotope from the damaged part of the heat transfer tube to the detection point in the main steam line in the steam generator (SG), this paper presents a calculation method of steady-state thermal hydraulic parameters of SG based on one-dimensional steady-state model and conservation equations of mass, momentum and energy. In this method, the finite difference method is used for discretization, and the drift flow model is used to process the two-phase flow in SG; On this basis, the ¹⁶N isotope transport time of SG with different power levels and different heat transfer tube leakage positions is calculated. By comparison, the results obtained by the calculation method proposed in this paper meet the engineering requirements and have been applied to HPR1000 nuclear power project.