THE RESEARCH OF OPERATION STRATEGY TO LOSS HEAT SINK OF SMALL MODULAR REACTORS

抄録

Small modular reactor adopts integrated reactor, passive safety and other advanced design concepts, with high inherent safety and engineering safety design characteristics. The accident of loss heat sink is a typical design extended conditions accident of PWR. The heat sink function of SMR can be divided into primary heat sink and secondary heat sink. The accident of loss heat sink of SMR refers to the loss of both types of heat sink. If the heat sink is lost, the residual heat cannot be removed in time, which risks the safety of the reactor. In this paper, the best estimation method based on realistic assumptions is used to conduct accident analysis, and the process of accident consequence after the loss heat sink of SMR is studied. According to the safety system design of SMR, the accident operation strategy of loss heat sink is given. After analysis and calculation verification, this strategy can effectively alleviate the core state after loss heat sink, establish a stable residual heat removal way, and ensure the safety of SMR after the accident of loss heat sink.