基于小型模块化压水堆失水事故(LOCA)的现象和特征,分析燃料包壳峰值温度(PCT)出现的机理,并研究安注箱(ACC)设置对PCT和事故长期降压的影响。结果表明:在一定范围中等破口尺寸LOCA下,ACC注水可能导致堆芯更不利的后果,小型堆可合理考虑ACC的作用进行系统设计。 Based on the phenomena and characteristics of a small modular PWR (LOCA) water loss accident, the mechanism of FCC peak pressure (PCT) was analyzed and the effect of ACC setting on PCT and accident long-term depressurization was studied. The results show that ACC flooding may lead to more adverse consequences for the core under a certain range of moderate breakage LOCA, and the small reactor can be systematically designed considering the role of ACC.