Conference Proceedings Paper
Analysis of PSBT Benchmark Exercises for Void Distribution and DNB Using a Subchannel Code MATRA
NURETH-14 - 2011 September 25-30
Dae-Hyun Hwang (Korea Atomic Energy Research Institute)
Seong Jin Kim (Korea Atomic Energy Research Institute)
Kyong-Won Seo (Korea Atomic Energy Research Institute)
In the framework of OECD/NRC PSBT benchmark, the subchannel grade void distribution data and
DNB data were evaluated by a subchannel code MATRA. The zone-averaged void fraction at the
central region of the 5x5 test bundle was compared with the benchmark data. Optimum values of
turbulent mixing parameter, which is an input parameter for MATRA code, were evaluated by
employing subchannel fluid temperature data. The influence of mixing vanes on the subchannel
flow distribution was examined through a CFD analysis. The steady-state DNB benchmark data
with uniform and non-uniform axial power shapes were evaluated by several DNB prediction
models including an empirical correlation, CHF lookup table, and representative mechanistic DNB
models with subchannel cross-sectional averaged local properties.
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