AP1000多样化驱动系统在ATWS缓解中的作用

The Function of AP1000 Diverse Actuation System in ATWS Mitigation

AP1000采用多样化驱动系统DAS作为反应堆保护系统的后备，降低了ATWS事件的发生概率，缓解了事故后果。本文基于概率安全评价的结果对AP1000机组的ATWS事故后果作了介绍，并简要分析了多样化驱动系统在ATWS事故缓解中的作用，评述了通过DAS实现停堆和ATWS缓解功能的过程。

Diverse actuation system is introduced in AP1000 as the backup system for the reactor protection system. It can reduce the probability of ATWS and mitigate the result of the accident. Based on PRA, this paper gives a brief description of the consequence of ATWS accident in AP1000 unit and analyzes the function of DAS in the mitigation of ATWS accident. In the end, the realization of the DAS reactor trip and ATWS mitigation function are discussed in details.