Abstract
Boiling water reactor (BWR) transients and accidents result in a spatial redistribution of the void content and thus of the power. In addition, for many transients, the reactivity feedback coefficients are varied over a wide range. Therefore, coupled thermal-hydraulics/3D neutron kinetics (TH/NK) methods are required for BWR transient analysis. The mapping or clustering of the system TH channels to the fuel assemblies of the NK module is one of the main modelling assumptions made for such coupled simulations. The simulation of BWR transients requires significant computing time if a detailed one-to-one fuel assembly to flow channel mapping is applied. This paper presents an attempt to find the minimal requirements for TH/3D-NK mapping for BWR transient analysis. In other words, we explore different methods of selecting optimal channel groupings and demonstrate how the number of channels affects the solution accuracy for a selected BWR fast transient. It was found that the optimal mapping strategy strongly depends on the parameters of interest, local, e.g. fuel assembly power, fuel cladding temperature, or integral, e.g. peak dome pressure, reactor peak power or downcomer water level. It was concluded that for many cases one-to-one clustering is an optimal technique for BWR coupled analysis.
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