Steam generator overfill due to steam generator tube rupture have been analyzed for CAP1400 plant, in which two cases were simulated, including pressurizer heater switching off available and unavailable under low pressurizer water level. The results indicate that it has a certain margin to steam generator (SG) overfill for the ruptured steam generator under steam generator tube rupture (SGTR) accident. Analysis results have also shown that the SG overfill margin will be slightly decreased in case of pressurizer heater swiching off unavailable, however, the impact is not significant.

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