多样化非能动衰变热排出方法研究

Study on diverse passive decay heat removal approach

事故情况下的衰变热排出是涉及核安全的重要方面。采用非能动方法来排出衰变热对于提高核反应堆的安全性非常有益。在目前一些先进反应堆中通过设置非能动余热排出系统、非能动安注系统、非能动安全壳冷却系统等安全子系统,形成多样化的从堆芯到最终热阱的非能动衰变热排出渠道。论文对多种非能动衰变热排出方法和系统设计方案进行了归纳总结,比较分析了这些非能动衰变热排出方法的共性特征和区别,探讨了非能动衰变热排出系统的设计原理。通过对传热过程分解,将这些衰变热排出方法表达为一些基本传热形式的不同组合方式,根据不同的组合可获得多样化的非能动衰变热排出方法和新的系统设计方案。

One of the most important principles for nuclear safety is the decay heat removal in accidents. Passive decay heat removal systems are extremely helpful to enhance the safety. In currently design of many advanced nuclear reactors, kinds of passive systems are proposed or developed, such as the passive residual heat removal system, passive injection system, passive containment cooling system. These systems provide entire passive heat removal paths from core to ultimate heat sink. Various kinds of passive systems for decay heat removal are summarized~ their common features or differences on heat removal paths and design principle are analyzed. It is found that, these passive decay heat removal paths are similarly common on and connected by several basic heat transfer modes and steps. By the combinations or connections of basic modes and steps, new passive decay heat removal approach or diverse system can he proposed.