Trace Code Validation for BWR Spray Cooling Injection and CCFL Condition Based on GÖTA Facility Experiments

Abstract

Best estimate codes have been used in the past thirty years for the design, licensing, and safety of NPP. Nevertheless, large efforts are necessary for the qualification and the assessment of such codes. The aim of this work is to study the main phenomena involved in the emergency spray cooling injection in a Swedish-designed BWR. For this purpose, data from the Swedish separate effect test facility GÖTA have been simulated using TRACE version 5.0 Patch 2. Furthermore, uncertainty calculations have been performed with the propagation of input errors method, and the identification of the input parameters that mostly influence the peak cladding temperature has been performed.

Simulation of reflooding on two parallel heated channel by TRACE

“…Such a system consists of two parallel, vertical, heated channels that resemble two simplified BWR fuel assemblies. In fact the rod bundle used in the GOTA experiments was simulated as bundle similar to BWR [9]. The TRACE model of the hypothetical system is such that: -A FILL is used to deliver water under normal conditions, from the bottom.…”