中文摘要：

氟盐冷却高温堆（FHR）是近年提出的一种新概念反应堆,继承了第四代反应堆和压水堆的技术特点,具有较高的经济性和安全性。以上海应用物理研究所设计的球床FHR（PB-FHR）为研究对象,采用CFD方法,建立了堆芯多孔介质模型,考虑了因燃料球堆积对冷却剂流动所产生的阻力作用,开展了PB-FHR热工水力安全限值研究,获得了两种不同工况下,满足堆芯入口温度、堆芯出口温度、冷却剂最高温度和燃料球中心最高温度限制的安全运行区间。研究对于PB-FHR的设计优化以及安全评审具有借鉴意义。

英文摘要：

The Fluoride-salt-cooled High-temperature Reactor（FHR） is an innovative concept reactor that inherits the technical foundation and advantages of three optional generation-IV reactors and pressurized water reactor.The preliminary analysis of the limiting safety system settings（LSSS） was performed for a Pebble-Bed FHR（PB-FHR） designed by Shanghai Institute of Applied Physics（SINAP） based on CFD methodology.The reactor core was modeled by the porous media method,in which the flow resistance effects of the fluoride-salt coolant caused by the fuel pebble-beds was considered.The LSSSs which satisfied the temperature limits of core inlet temperature,core outlet temperature,maximum coolant temperature and maximum pebble fuel temperature were obtained for two different operation conditions.This research can provide valuable information for the design optimization and reactor licensing of PB-FHR.