AP1000 model, including Reactor Coolant System(RCS), Engineering Safety Features (ESFs), and containment, is built by using the integrated severe analysis code. According to AP1000 Probability Risk Analysis (PRA), several typical sequences are selected. The accident progressions are analyzed and hydrogen sources are investigated. It indicates that 624kg hydrogen will be generated in pressure vessel induced by MB-LOCA. The model of hydrogen control system, which consists of 64 glow-up igniters and two Passive Autocatalytic Recombiners (PARs), is built to analyze the effectiveness of removing hydrogen and the combustion modes are identified by the Shapiro triangular diagram. The results show that hydrogen concentration could be controlled within the safety limits by using 64 glow-up igniters and two PARs to protect the containment integrity from hydrogen deflagration or detonation.