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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis of natural circulation behaviors and flow instabilities of passive containment cooling system design for advanced PWR using MARS-KS code
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Analysis of natural circulation behaviors and flow instabilities of passive containment cooling system design for advanced PWR using MARS-KS code

机译：使用MARS-KS代码分析高级压水堆被动安全壳冷却系统设计的自然循环行为和流动不稳定性

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摘要

Several design basis accidents such as loss of coolant accident (LOCA) and main steam line break (MSLB) of pressurized light water reactor could threaten the integrity of containment building by increasing containment temperature and pressure. Although containment spray systems (CSS) have been installed for the depressurization of containment against the accidents, iPower nuclear power plant requires additional passive safety system design to provide for malfunction of CSS. Therefore, passive containment cooling system (PCCS), which consists of passive containment cooling tank (PCCT), heat exchanger modules, and connection pipelines, is under development. The natural circulation behavior of the PCCS is an important hydraulic phenomenon for the guarantee of decay heat removal capacity, required to satisfy the safety acceptance criteria. Especially, flow instabilities, which could threaten the structural integrity and enlarge the performance uncertainty of the system, have been reported for multi-channel heat exchangers operating with natural circulation like present PCCS design of iPower reactor. In this study, the natural circulation behaviors of iPower PCCS according to various operating conditions and design parameters (elevation of returning pipeline) were analyzed by MARS-KS code to observe the flow instability phenomenon inside the system. Two types of flow instabilities, flashing-induced instability and density wave oscillation were observed in the PCCS with different heights of returning pipeline. Through additional analysis on flow stability map of PCCS design, effects of mitigation strategies (system pressure and flow resistance) on natural circulation behavior of the system were quantified. The analysis results provide physical insight on possible flow instability and its mitigation strategies, that would be crucial information on designing natural circulation-driven multi-channel heat exchanging system consisting of more than two heat exchanger modules.
机译：加压轻水反应堆的冷却液损失事故（LOCA）和主蒸汽管线破裂（MSLB）等几种设计基准事故可能会通过提高安全壳温度和压力来威胁安全壳建筑物的完整性。尽管已经安装了安全壳喷淋系统（CSS）来对事故进行安全壳减压，但是iPower核电站需要额外的无源安全系统设计来提供CSS的故障。因此，正在开发由被动安全壳冷却水箱（PCCT），热交换器模块和连接管道组成的被动安全壳冷却系统（PCCS）。 PCCS的自然循环行为是重要的水力现象，用于确保满足安全验收标准所需的衰减排热能力。尤其是，对于自然循环运行的多通道换热器（如iPower反应堆的当前PCCS设计），已经报道了可能会威胁结构完整性并扩大系统性能不确定性的流动不稳定性。在本研究中，通过MARS-KS代码分析了iPower PCCS根据各种工况和设计参数（回油管高程）的自然循环行为，以观察系统内部的流量不稳定现象。在具有不同回水管高度的PCCS中，观察到两种流动不稳定性，即闪动引起的不稳定性和密度波振荡。通过对PCCS设计的流动稳定性图进行附加分析，量化了缓解策略（系统压力和流阻）对系统自然循环行为的影响。分析结果提供了有关可能的流动不稳定性及其缓解策略的物理见解，这对于设计由两个以上热交换器模块组成的自然循环驱动多通道换热系统至关重要。

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