气泡泵及其对ADS次临界堆瞬态及事故工况下的动态特性影响的实验与理论研究

加速器驱动次临界堆系统（ADS）致力于嬗变核废物、有效利用核资源及产出核能量,是实现核电可持续发展战略的正确选择。本项目以具有先进设计概念的铅铋自然循环冷却ADS为研究对象，深入研究气泡泵提升铅铋冷却剂自然循环能力的机理，探索气泡泵对ADS次临界堆瞬态及事故工况下的动态特性的影响，全面评价ADS固有安全性。具体研究内容和目标包括：1）开展气泡泵实验研究，探索惰性气体-液态金属两相流特性；2）基于实验研究成果建立气泡泵自然循环数学物理模型，分析气泡泵启停瞬态特性；3) 研究气泡泵对ADS次临界堆瞬态及事故工况下的动态特性影响。以上研究内容是先进液态金属冷却ADS技术开发所需解决的基础性研究工作，是学科交叉型研究课题，具有重要的工程应用价值和学术价值。

Accelerator driven subcritical reactor system (ADS) is designed to transmute radioactive waste, to utilize nuclear resources effectively and to generate nuclear power with a distinctive characteristic of inherent safety. Thus, it is a right choice to achieve the sustainable development strategy for nuclear energy with this advanced system. This research project focuses on the advanced design concept of ADS which is cooled by the natural circulation of liquid lead-bismuth eutectic, and investigates the impact of the gas-lift pump on the dynamic characteristics of ADS under the transient and accident conditions. Furthermore, the comprehensive evaluation of the inherent safety of ADS will be performed in this study. The research aims and concrete contents of the study include: 1) performing gas-lift pump experiments to investigate the characteristics of the inert gas-liquid metal two phase flow; 2) establishing a mathematical-physical model of the natural convection of gas-lift pump based on the experimental results; 3) investigating the influence of gas-lift pump on the dynamic characteristics of ADS under the transient and accident conditions. In general, this study is an essential and basic research for developing the advanced liquid metal- cooled ADS. It is a multi-discipline crossed research, and has great value in both theoretical foundations and practical applications.