SB-LOCA Counterpart Test - LOBI, SPES, BETHSY, LSTF, PSB - Preliminary ATLAS calculation

Counterpart test on SB-LOCA was conducted in early ‘90 on four ITF + one in early 2000’s - LOBI – power-to-volume, Kv = 1/712 [KWU-PWR, 4 loops] - SPES – power-to-volume, Kv = 1/427 [Westinghouse-PWR, 3 loops] - BETHSY – power-to-volume, Kv = 1/100 [French-PWR, 3 loops] - LSTF – power-to-volume, Kv = 1/48 [Westinghouse-PWR, 4 loops] - PSB – power-to-volume, Kv = 1/300 [VVER-1000] - Performed in 2000’s Break area/ ITF volume ≃ 6.52e-5 (6%-4% break at reference reactors scale) Main features of the tests (some distortions exit): - SB-LOCA in CL – Loop with PRZ - Low initial power (∼ 10%) – LOBI and SPES tests repeated at high power (100%) - Same core outlet temperature - SG interconnected and isolated - MCP trip occurs - HPIS not available - Accumulator injection at 42 bar – Intact loops - LPIS simulated in LOBI and SPES (and PSB) – Intact loops Detailed evaluation of the experimental database performed Extensive post-test analyses conducted with RELAP5 and CATHARE2 codes