ROSA/LSTF test and RELAP5 code analyses on PWR hot leg small-break LOCA with accident management measure based on core exit temperature and PKL counterpart test

Appliance of scaling methodologies for designing counterpart experiments dominated by natural circulation phenomena

“…A 1% SBLOCA in a cold leg (SB-CL-32) in the LSTF was utilized to stabilize the initial and boundary conditions to the equivalent tests in PKL and ATLAS. In that test, the PCT and the core quench were heavily influenced by the loop seal clearing phenomenon, which evolves differently because of the intermediate leg geometry and the location of the active core [14] [15]. The limited knowledge on intermediate breaks led the USNRC in 2005 to propose these scenarios as a design basis event for the assessment of the effectiveness of emergency core cooling systems.…”