Power-to-Energy Scaling Methodology in the SNUF for DVI line Break SBLOCA Using the MARS Code

APR1400 (Advanced Power Reactor 1400MWe) adopted the DVI (Direct Vessel Injection) system as the advanced feature of ECCS (Emergency Core Cooling System). It requires the safety analysis for the DVI line break SBLOCA and the conventional analysis model should be estimated or revised for application of the accident. The integral test loop, SNUF (Seoul National University Facility) is utilized for this study. It has been constructed to be scaled down to 1/6.4 in length and 1/178 in area from APR1400. And it is RHRP (Reduced-Height and Reduced-Pressure) system. Therefore, an appropriate scaling methodology in the RHRP facility is indispensable to observe the key thermal-hydraulic transient phenomena. Thus the major task of this paper is to propose a suitable scaling method in the SNUF for DVI link break SBLOCA using the best-estimate safety analysis code, MARS