SIMULATION OF TWO-PHASE NATURAL CIRCULATION BEHAVIOUR IN A PARALLEL CHANNEL LOOP USING RELAP5/MOD3.2 COMPUTER CODE

摘要

Parallel channel loop under two-phase natural circulation is simulated for pre-test analysis using RELAP5/Mod3.2. Steady state and instability behaviour is studied for equally heated parallel channels using different nodalisation schemes for the heaters over a wide range of operating conditions. Results are presented for operating pressure of 5 bar and 10 bar each with relatively coarse and fine nodalisations.