Abstract
Steam generator (SG) heat-exchange tube rupture (SGTR) is a unique and severe accident, which will result in water ingress into the reactor The analysis on water ingress transient of SGTR holds significant importance for verifying the inherent safety characteristics of high temperature gas-cooled reactor (HTGR). The 10 MW HTGR, designed by Tsinghua University, is exampled to be analyzed in this paper. The accident scenarios of a double-ended guillotine rupture at inlet and outlet of a heat-exchange tube are simulated respectively by RELAP5/MOD3.2. The results show that both water ingress mass and the rupture flow rate are significantly related to the rupture location. The draining system rapidly discharged water from the SG, mitigating effectively the accident consequences. Due to thermal inertia, the coolant inside the average tube refluxes and surges out of the rupture, so it is essential to consider the measures for the timely evacuation of the average tube.
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