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7 September 2022 Study on the influence of SG structure on the natural circulation characteristics of PWR units
Weichen Hu, Jianquan Liu
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Proceedings Volume 12329, Third International Conference on Artificial Intelligence and Electromechanical Automation (AIEA 2022); 1232942 (2022) https://doi.org/10.1117/12.2646925
Event: Third International Conference on Artificial Intelligence and Electromechanical Automation (AIEA 2022), 2022, Changsha, China
Abstract
The natural circulation capability of the primary circuit directly affects the safe operation of the reactor under accidents such as loss-of-flow accident. In this paper, we model a megawatt-scale unit using the system analysis program RELAP5 to consider the effect of the steam generator U-tube arrangement on the natural circulation characteristics of the primary circuit. It is shown that: the flow rate of the primary circuit coolant at steady state varies according to different U-tube arrangements. During the long-term process of natural circulation, all three U-tube arrangements can establish an effective natural circulation. The horizontal-U type has the best cooling effect on the core and the highest natural circulation flow rate for the same design basis conditions. The inverted-U type steam generator showed a phenomenon in which the pressure in the outlet chamber was greater than that in the inlet chamber.
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Weichen Hu and Jianquan Liu "Study on the influence of SG structure on the natural circulation characteristics of PWR units", Proc. SPIE 12329, Third International Conference on Artificial Intelligence and Electromechanical Automation (AIEA 2022), 1232942 (7 September 2022); https://doi.org/10.1117/12.2646925
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KEYWORDS
Safety
Systems modeling
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