• 反应堆工程 •

### 日本文殊原型快堆堆芯出口腔室热分层现象数值模拟

1. 1.中国原子能科学研究院 中国实验快堆工程部，北京102413；2.环境保护部 核与辐射安全中心，北京100082
• 出版日期:2013-10-20 发布日期:2013-10-20

### Numerical Simulation of Thermal Stratification in Reactor Upper Plenum of Monju Prototype Fast Reactor

XUE Xiu-li1;FU Zhi-wei2,*;FENG Yu-heng1;LIU Yi-zhe1;XU Yi-jun1;YANG Hong-yi1

1. 1.China Institute of Atomic Energy, P. O. Box 275-34, Beijing 102413, China;2.Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China
• Online:2013-10-20 Published:2013-10-20

Abstract:

Using a commercial CFD code STAR-CCM+ and adopting rational meshing technology and physical models, an approximate 1∶1 scale numerical simulation model for Monju Prototype Fast Reactor upper plenum was established, a numerical investigation of thermal-hydraulic phenomenon under 40% rated power output condition was carried out, and the relatively complete process of thermal stratification within upper plenum was studied. The results show that the steady thermal stratification is set up at 2 min after reactor shutdown and gets across the top of the up-flow barrel during 10-21 min, the flow pattern is unstable during 10-140 min when thermal stratification locates near the top of the up-flow barrel, and stable flow pattern close to that before reactor shutdown is resumed at 140 min after reactor shutdown. By comparing with test result, it is shown that a good agreement is achieved at an early stage of the transient (0-4 min), which can be concluded that the present numerical simulation is applicable to investigate the thermal stratification phenomena. It is also demonstrated that the elevation of the interface of the thermal stratification is overestimated after 4 min from the reactor trip, which is largely due to the difference of simulation boundaries and structure with the reality.