Assessment of RELAP5/MOD2 Against Critical Flow Data from Marviken Tests JIT 11 (Jet Impingement Test 11) and CFT 21 (Critical Flow Test 21).

摘要

RELAP5/MOD2 simulations of the critical flow of saturated steam are reported together with simulations of the critical flow of subcooled liquid and low-quality two-phase mixture. The experiments which were simulated used nozzle diameters of 0.3 m and 0.5 m. RELAP5 overpredicted the experimental flow rates by 10 to 25 percent unless discharge coefficients were applied.