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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

BORON MIXING IN A REACTOR CORE AND DOWNCOMER

Get access (open in a dialog) pages 883-892
DOI: 10.1615/TFEC2019.fip.028441

摘要

A CFD analysis was performed for the full scale model and a 1/5-linear scale model to evaluate the similarity of boric acid mixing in the downcomer and the reactor core. By applying the linear scale methodology and conservation of Euler number, the prototype flow distribution is preserved. Since the core of a prototype nuclear power plant is composed of a mixing grid of nuclear fuel assemblies with complex shapes, a large-capacity computer is required to simulate the actual shape by CFD. In this study, the core of the reference nuclear reactor was modeled as a porous media and preserved axial pressure drop and transverse flow distribution characteristics. The similarity of the 1/5-linear scale model was compared with the flow distribution of the reference full scale plant. The 1/5-linear scale core was evaluated for two models: (1) Free Cavity and (2) mixing vane. The free cavity core model is a model in which the active core part is completely empty. The mixing vane core model is a model in which the pressure drop of the mixing vane in the fuel assembly (F/A) and the hydraulic diameter of the fuel rod are preserved. That is, the F/A shape of the core is simulated closely and pressure drop and cross flow characteristics are also preserved. The similarity of boric acid to Shutdown Cooling System (SCS) and Control Volume-and-Chemical System (CVCS) was well evaluated.