OECD/NEA PSBT Benchmark: Simulation of the Steady-State Sub-Channel Test-Case with NEPTUNE CFD

Abstract

In this paper, we present numerical results obtained with the multifield CFD code NEPTUNE_CFD in the framework of the OECD/NRC PWR Subchannel and Bundle Tests (PSBT) international benchmark, focusing on the simulation of five selected runs of the steady-state subchannel exercise. The propagation of the estimated experimental uncertainties on the simulations results is investigated, as well as the mesh sensitivity of the axial evolution of the mean void-fraction by using three grid levels. Last, calculation results using a devoted model for the bubble-size distribution are presented.