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<p>In this study, component-scale simulations were performed to analyze natural convection in the reactor’s passive safety cooling pool. Conventional one-dimensional system-scale thermal-hydraulic codes widely used in the nuclear field are limited in capturing cross-flow or swirling flow, thus making them inadequate for analyzing natural convection phenomena in reactor cooling pools. Passive safety cooling pools play a critical role in removing decay heat over long durations during reactor accidents; however, CFD-scale simulations are computationally prohibitive, making it difficult to investigate diverse designs and accident scenarios. CUPID, a 3D two-fluid simulation code, is capable of modeling both single- and two-phase natural circulation phenomena. Its component-scale framework ensures computational efficiency, making it a practical tool for evaluating natural convection and thermal mixing in cooling pools. This study aims to simulate single- to two-phase natural convection in the cooling pool using the CUPID code and validate the approach through comparison with RANS analysis.</p>

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Natural convection analysis in a safety pool of an SMR using three-dimensional component-scale thermal hydraulics technique

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Seongju Do,
  • Seung Jun Lee

摘要

In this study, component-scale simulations were performed to analyze natural convection in the reactor’s passive safety cooling pool. Conventional one-dimensional system-scale thermal-hydraulic codes widely used in the nuclear field are limited in capturing cross-flow or swirling flow, thus making them inadequate for analyzing natural convection phenomena in reactor cooling pools. Passive safety cooling pools play a critical role in removing decay heat over long durations during reactor accidents; however, CFD-scale simulations are computationally prohibitive, making it difficult to investigate diverse designs and accident scenarios. CUPID, a 3D two-fluid simulation code, is capable of modeling both single- and two-phase natural circulation phenomena. Its component-scale framework ensures computational efficiency, making it a practical tool for evaluating natural convection and thermal mixing in cooling pools. This study aims to simulate single- to two-phase natural convection in the cooling pool using the CUPID code and validate the approach through comparison with RANS analysis.