ACP100+失水事故应对策略研究

Strategy for Loss of Coolant Accident in ACP100+

对先进模块化小型堆(ACP100+)失水事故后的应急堆芯冷却、安全壳压力控制、余热长期导出提出了相应的应对手段和策略。初步计算分析表明:通过限制ACP100+反应堆冷却剂破口尺寸可取消安注箱,使安注系统得到简化;对于小型钢安全壳带来的事故后压力控制问题,可采用抑压水池和顶部非能动水池设计,使事故后安全壳压力可长期控制在设计限值以下;由于小型堆余热量较小,可利用钢安全壳体作为导热媒介,通过浸没安全壳顶盖,以自然对流的方式长期导出余热,其长期冷却的固有安全性得到进一步提高。

Based on the scheme of the ACP100＋ small modular reactor such as the inner PRZ and steel containment, the strategy for the emergency core cooling, pressure controlling in the containment and long-term cooling are proposed. According to the elementary calculation and analysis, the accumulator can be eliminated for the ACP100＋ and the safety injection system is simplified. The release of mass and energy can be controlled more easily due to the smaller size of break based on pressure restrained pool and containment pool above the small steel containment. And the long-term residual heat can the taken out through the pool above the containment based on the natural convection and the inherent safety can be enhanced.