Assessment of the spacer effects on coolant mixing between adjacent subchannels in PWR fuel assembly

  • Aamer Ahmed Alzeyoudi

    Student thesis: Master's Thesis


    This study present a numerical investigation, using a CFD commercial code Star-CCM+, to examine the effects of grid spacers on the coolant streamwise and lateral mixing within the pressurized water reactors (PWRs) rod bundle. A simple design of the spacers is suggested herein, that should be simple enough to reproduce for future CFD benchmark studies but is able to mimic the main physical phenomena found in the real and full-scale assemblies. The flow conditions are of the same order of the APR1400 power plant being commissioned in the UAE. The present numerical study will provide the basis to build, a very much needed and more reliable comparison between the realizable two-layer
    Date of AwardJun 2017
    Original languageAmerican English
    SupervisorYacine Addad (Supervisor)


    • Fuel assemblies; Spacer grids; Nuclear design; Nuclear safety
    • Swirl flow.

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