In-containment hydrogen behavior simulation and hydrogen concentration control under LBLOCA accidents

During a design basis accident in pressurized water reactor (PWR), the released hydrogen through breaks would induce detonation. The passive autocatalytic recombiner (PAR) is widely used as elimination measure nuclear power plants due to its capability, low starting threshold and easy installation. present work aims study risk after occurrence of cold section double-end shear fracture large break loss coolant (LBLOCA) by using 3D computational fluid dynamics program GASFLOW. A full containment model CPR1000 built. production rate inside LBLOCA calculated from related physicochemical reactions. transport, concentration distribution temperature are simulated. effects different roughness structure surface on simulation investigated, it proved that operation PAR can control under safety 4 vol%. flow PAR’s position efficiency studied. Based these studies, this paper makes some suggestions theoretical references for spatial arrangement scheme optimize efficiency.