先进压水堆核电厂氢气控制策略分析研究

新建核电厂的设计必须做到“实际消除”早期与大量放射性释放的可能性，氢气燃爆导致的安全壳失效是必须要“实际消除”的严重事故工况之一。因此对各种消氢措施的特点进行分析研究，建立联合消氢策略评价方法，可为先进压水堆核电厂氢气控制策略选择设计评价提供支持手段。根据严重事故管理中对氢气控制策略的考虑，研究安全壳内局部位置的可燃性是相关设计评价的关键问题。根据可燃性准则、火焰加速准则、燃爆转变准则，本文使用三维CFD程序对典型严重事故工况下安全壳蒸汽发生器隔间内的可燃性及氢气风险进行模拟分析。研究结果表明，虽然喷放源项中有大量水蒸气，蒸汽发生器隔间中仍有较大区域处于可燃限值以内，合理布置的点火器能在设计中点燃并消除氢气。本研究建立的分析方法能用于对核电厂氢气控制策略选择设计的评价。

Research on Hydrogen Control Strategy in Advanced Pressurized Water Reactor Nuclear Power Plant

The design of new-built nuclear power plant (NPP) must achieve the result that the possibility of early radioactive release or large radioactive release is ‘practically eliminated’, and the containment failure caused by hydrogen detonation is one of the severe accident conditions that shall be ‘practical eliminated’. So each kind of hydrogen elimination measures should be analyzed and investigated to establish assessment method. And it could provide supporting method for reviewing on design selection of hydrogen control strategy for advanced pressurized water reactor (PWR) NPP. Considering the hydrogen control strategy in severe accident management, it is the key issue to conduct review on combustibility of local space in containment. Based on the criterion of combustibility, flame acceleration (FA) and deflagration to detonation transition (DDT), 3D-CFD code was used to simulate the combustibility and hydrogen risk in steam generator compartment under representative severe accident condition. The results indicate that the combustibility still exists in large zone of compartment, even though the discharging gas is entrained with a high percentage of steam, and igniters with design of reasonable layout are able to ignite and eliminate hydrogen. The analysis method in this paper can be used to assess the design selection of hydrogen control strategy in NPP.