Abstract
The coolant flow rate stability in a two-circuit APP with a fast breeder reactor cooled by supercritical pressure steam is numerically analyzed. The investigation is done using the D-decomposition method in the plane of the stability-determining parameters based on a one-dimensional homogeneous model of heat and mass transfer processes in the APP circulation loop. The D-decomposition boundary is constructed using the methodology of numerical computation of the transfer function contained in the characteristic equation of the mathematical model. The flow rate stability in the first closed circuit of the APP, in the second circuit of the steam generator and in the parallel channels of the shield fuel assemblies of the reactor core is analyzed, accounting for the variation of energy release over different fuel assembly groups. The coolant flow rate stability in the nominal regime is found to be provided with a margin. Keywords: reactor core, coolant circulation loop, stability region, steam generator, supercritical steam pressure, flexible regulation mode of the turbine, coolant, thermal-hydraulic instability, shield fuel assembly.
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