[1K01-07] Numerical Analysis

[1K01] Application of subchannel analysis to the evaluation of cladding temperatures during accidents

(3) Examination of the Void Drift Model

*Naoki Sano¹, Koji Nishida¹, Seitaro Sakurai¹ (1. INSS)

Keywords:void drift, quality, subchannel analysis

We calculated mass velocity and quality in 3x3 rod bundle experiments (GE) and 4x4 rod bundle experiments (ISPRA) by subchannel analysis code COBRA-EN.In both experiments subcooled water enters at the lower inlet of the bundle, two phase flow out the upper exit, and then mass velocity and quality were measured.The bundle has 9 rods and experiments were conducted under BWR operating condition in GE and the bundle has 16 rods and experiments were conducted under PWR and BWR condition in ISPRA.We also implemented void-drift model in COBRA-EN and evaluated the effect of this model on analysis result.