本文利用 SACOS-PB 程序对卧式铅铋堆单组件和全堆芯开展了瞬态热工水力及安全特性分析，考虑了倾斜、起伏和摇摆等典型海洋运动工况。利用耦合分析平台，对起伏与纵摇同时存在的耦合海洋条件下卧式铅铋堆全系统开展典型事故安全分析，包括 UTOP 事故及两者共存的叠加事故。

In this paper, the transient thermo-hydraulic and safety characteristics of the single component and the whole core of a horizontal lead-bismuth reactor are analyzed by SACOS-PB program. The typical Marine motion conditions such as tilt, heave and sway are considered.By using the coupled analysis platform, typical accidents of the whole system of horizontal lead-bismuth reactor under coupled ocean conditions with both heave and pitch are analyzed, including the UTOP accident and the superposition accident co-existing with both.