Development of SBLOCA evaluation methodology using the SPACE code

The nuclear thermal hydraulic system code known as SPACE (Safety and Performance Analysis Code) which is capable of two-phase, three-field and multi-dimensional analyses, is under development. To set up the conservative evaluation methodology for APR1400 SBLOCA, the Moody model implemented into the SPACE code was preliminarily assessed for a conservative prediction of the discharge flow under a two-phase condition. Although some unphysical behaviors appear as a result of not considering the time-smoothing here, the major results show that the conservative discharge model was successfully implemented into the best-estimate version of the SPACE code. Other required models and correlations will be implemented and evaluated against associated separate effect tests