Testing Special TRACE5 Models Applied to SBLOCA Scenarios

Abstract

In the Small Break Loss-Of-Coolant Accident (SBLOCA) scenarios there are important physical phenomena that affect the behaviour of the whole system. The aim of this work is to test some special models of TRACE5 applied to SBLOCA transients in the frame of the OECD/ROSA Project Test 1-2, simulating a small break LOCA in the hot leg. The special models tested have been: the Offtake model for stratified flow in a horizontal pipe and the Counter-Current Flow Limit model (Wallis and Kutateladze options) to reproduce reflux condensation in U-tubes of steam generators.