The Research and Simulation of Beyond Design Basis Accidents in PWR Nuclear Power Plant

Fukushima nuclear accident occurred due to earthquake and beyond-design-basis tsunami, which is beyond design basis accident (BDBA); it is necessary to carry out relevant research on pressurized water reactor (PWR) nuclear power plant (NPP). Starting from the relations between various types of operating and accident conditions, this paper summarizes the BDBAs in the accident control guideline. During simulator training exercises with BDBAs including total loss to the steam generator feedwater and total loss of on-site and off-site electrical power supplies incident conditions, the evolution of nuclear safety-related parameters is studied, and the rules and the reasons of the evaluation are summarized. All this is helpful for the operator to master the principle of the accident.