Issues on placement principle and site survey of hydrogen control system in nuclear power plant

In order to meet safety goal of 'practical elimination', 'eliminating the possibility of working conditions at nuclear power plants that cause early or large releases of radioactivity' by designing, which was put forward in China's nuclear safety regulation, a set of detailed placement principle of hydrogen control system is needed for China's advanced nuclear power plant (NPP). Firstly, the background and significance of placement principle was analyzed from the aspects of regulation requirement and orientation of safety analysis calculation; then the layout principles of hydrogen control system in international advanced nuclear power plant design are investigated; moreover, on the basis of issues raised from site survey in containment building, the paper discussed the form, content and design requirement of placement principle of passive auto-catalytic recombiner (PAR) for China's advanced NPP. Combined with nuclear safety inspection and site survey, issues and difficulties was summarized, which needs to be solved in design process of placement principle for hydrogen control system of China's advanced NPP, and it provides technical reference for design optimization on relevant equipment placement and compartment structure in containment. (authors)