Analysis of PSBT Benchmark Exercises for Void Distribution and DNB Using a Subchannel Code MATRA
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
O8-3 OECD Thermalhydraulics Benchmarks

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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