Two- and three-dimensional experiments for oxide pool in in-vessel retention of core melts

  • Kim, Su-Hyeon (Department of Nuclear Engineering, Kyung Hee University) ;
  • Park, Hae-Kyun (Department of Nuclear Engineering, Kyung Hee University) ;
  • Chung, Bum-Jin (Department of Nuclear Engineering, Kyung Hee University)
  • Received : 2016.11.10
  • Accepted : 2017.05.29
  • Published : 2017.10.25


To investigate the heat loads imposed on a reactor vessel through the natural convection of core melts in severe accidents, mass transfer experiments were performed based on the heat transfer/mass transfer analogy, using two- (2-D) and three-dimensional (3-D) facilities of various heights. The modified Rayleigh numbers ranged from $10^{12}$ to $10^{15}$, with a fixed Prandtl number of 2,014. The measured Nusselt numbers showed a trend similar to those of existing studies, but the absolute values showed discrepancies owing to the high Prandtl number of this system. The measured angle-dependent Nusselt numbers were analyzed for 2-D and 3-D geometries, and a multiplier was developed that enables the extrapolation of 2-D data into 3-D data. The definition of $Ra^{\prime}_H$ was specified for 2-D geometries, so that results could be extrapolated for 3-D geometries; also, heat transfer correlations were developed.


Supported by : National Research Foundation (NRF)


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