Assessment of the TRACE Code Against Rod Bundle Heat Transfer Transient Uncovery Data

摘要

Comparison between RBHT transient uncovery data and TRACE showed good agreement with respect to the axial bundle void fraction, two-phase mixture level at heatup, and collapsed liquid level. It also showed good agreement with respect to the PCT at lower bundle elevations whereas over-prediction of the PCT at higher elevations is conservative and may be due to a lack of grid models in TRACE, since grids provide an enhance cooling effect.