Assessment of Scaling principles for the Simulation of Small Break LOCA in PWR

Small Break Loss of Coolant Accident (SBLOCA) scenarios was considered in a number of research programs conducted with Integral test Facilities (ITF) in the world following the Three Mile Island (TMI) occurred in 1979. Long lasting transients, several hundred seconds or more, showed to be more complex for prediction than short lasting transients like Large Break LOCA (LBLOCA) of primary attention before the TMI event. Furthermore, large differences were measured from different experiments performed in differently scaled ITF. In the present paper, experiments performed in different ITF (noticeably LOFT, and SEMISCALE in US and LOBI in EC), all of those simulators of Pressurized Water Reactors (PWR), were analysed putting the bases of procedures to address the scaling issue