For the Korean design of the PCCS (passive containment cooling system) in an innovative PWR, the overall thermal resistance around a condenser tube is dominated by the heat transfer coefficient of steam condensation on the exterior surface. It has been reported, however, that the calculated heat transfer coefficients by thermal-hydraulic system codes were much lower than measured data in separate effect tests. In this study, a new empirical model of steam condensation in the presence of a noncondensable gas was implemented into the MARS-KS 1.4 code to replace the conventional Colburn-Hougen model. The selected correlation had been developed from condensation test data obtained at the JERICHO (JNU Experimental Rig for Investigation of Condensation Heat transfer On tube) facility, and considered the effect of the Grashof number for naturally circulating gas mixture and the curvature of the condenser tube. The modified MARS-KS code was applied to simulate the transient response of the containment equipped with the PCCS to the large-break loss-of-coolant accident. The heat removal performances of the PCCS and corresponding evolution of the containment pressure were compared to those calculated via the original model. Various thermal-hydraulic parameters associated with the natural circulation operation through the heat transport circuit were also investigated.

对于采用创新压水堆的 PCCS（被动安全壳冷却系统）的韩国设计，冷凝器管周围的整体热阻取决于外表面蒸汽冷凝的传热系数。然而，据报道，通过热工水力系统代码计算出的传热系数远低于单独效果测试中的测量数据。在这项研究中，在存在不可凝气体的情况下，新的蒸汽冷凝经验模型被应用到 MARS-KS 1.4 代码中，以取代传统的 Colburn-Hougen 模型。选定的相关性是根据在 JERICHO（JNU 管上冷凝传热研究实验台）设施获得的冷凝测试数据开发的，并考虑了自然循环气体混合物的 Grashof 数和冷凝管曲率的影响。应用修改后的 MARS-KS 代码模拟装有 PCCS 的安全壳对大断口失冷事故的瞬态响应。将 PCCS 的散热性能和安全壳压力的相应演变与通过原始模型计算的结果进行了比较。还研究了与通过热传输回路的自然循环操作相关的各种热工水力参数。将 PCCS 的散热性能和安全壳压力的相应演变与通过原始模型计算的结果进行了比较。还研究了与通过热传输回路的自然循环操作相关的各种热工水力参数。将 PCCS 的散热性能和安全壳压力的相应演变与通过原始模型计算的结果进行了比较。还研究了与通过热传输回路的自然循环操作相关的各种热工水力参数。