Small Break LOCA (SB-LOCA) transients are compared to illustrate and validate a scaling methodology for reduced pressure integral facilities. This methodology is extended to include the analysis of the High Pressure Injection (HPI) boundary conditions. The tests are conducted in the MIST full pressure, full height facility and in the UMCP reduced pressure, reduced height facility. Two main parameters are chosen: the system inventory as a chronological scale and the normalized pressure as the parameter which represents the system behavior. The normalized results presented demonstrate that, for a SB-LOCA where the fluid leaving the system is subcooled, it is possible to scale a full pressure transient from tests conducted in a reduced pressure facility, with great advantages in terms of costs and time of analysis
