国产先进压水堆严重事故下氢气行为及控制系统分析

严重事故下的氢气控制是核电厂安全需要考虑的重要问题之一。采用一体化严重事故分析程序对国产先进压水堆核电厂进行系统建模,选取大破口触发的严重事故序列,对严重事故工况下的氢气产生情况及氢气控制系统的性能进行分析评价。结果表明:大破口事故序列下氢气的产生主要有两个阶段,分别是早期锆包壳与水反应产生氢气及堆芯熔融物迁移至下腔室产生氢气,其中燃料包壳的氧化是产氢的主要阶段,氢气释放时间较早,氢气产生速率较大。氢气控制系统的设计能够有效缓解可能的氢气风险,满足相关法规标准的安全要求,确保安全壳的完整性。

Analysis of Hydrogen Behavior and Control System for Domestic Advanced PWR During Severe Accidents

Hydrogen control under severe accidents is one of the key issue for nuclear power plant.The nuclear power plant system is modeled with an integral severe accident analysis code.The severe accident induced by large break loss of coolant accident (LBLOCA)is selected for the comparative calculation research.The hydrogen generation characteristic and the effectiveness of hydrogen control system are studied.The analysis results indicate that:There are two main stages of hydrogen production:early zirconium cladding reacts with water to produce hydrogen and the core melt migrates to the lower chamber to produce hydrogen.The oxidation of fuel cladding is the main stage of hydrogen production,and the hydrogen release early,hydrogen generation rate is large.The hydrogen control system can effectively mitigate the possible hydrogen risk,to meet the relevant regulatory standards and safety requirements and ensure the integrity of the containment.