三门核电厂氢气风险控制措施研究

Hydrogen Risk Control Measures for Sanmen NPP

摘要: 安全壳冷却失效导致严重事故后安全壳处于严重威胁状态，超压风险和氢气风险并存。结合电厂严重事故管理导则，研究安全壳严重威胁状态下的氢气风险控制。根据严重事故管理导则在安全壳严重威胁状态下执行SCG-2“恢复安全壳冷却”和SCG-3“控制安全壳氢气风险”中的严重事故管理措施。研究发现在降低安全壳压力的同时破坏了安全壳内的惰化环境，导致较高的氢气风险，如不采取减少氢气装量的措施，则无法真正消除氢气风险。

Abstract:  Failure of containment cooling induces inert containment environment after initial event and results in coexistence of containment overpressure challenge and hydrogen challenge, which is a containment severe challenge status. After Fukushima accident, assessment of hydrogen risk under containment severe challenge status according to Sanmen SAMG in operation is needed. Effect of SCG-2 and SCG-3 from SAMG is investigated; the result shows that establishing of containment cooling does depressurize the containment but steam inert is break and high hydrogen risk is observed. The preferred means in SAMG does not reduce hydrogen inventory, and thus do not mitigate hydrogen risk fundamentally.