岭澳核电站二期LOFW+ATWS事故的氢气风险研究

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Hydrogen Safety Analysis of Ling’ao Ⅱ NPP under LOFW+ATWS Accident

School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

摘要: 应用安全壳内氢气安全分析程序(GASFLOW)模拟了岭澳核电站二期在失去给水+未能紧急停堆的预计瞬变(LOFW+ATWS)事故下安全壳内氢气和水蒸汽的行为,对事故进程中氢气的风险进行了安全分析,特别是对氢气缓解系统的效果进行了评价。模拟结果说明,安全壳内温度与压力的变化与水蒸汽的喷放密切相关;水蒸汽在安全壳内会呈现一定的分层现象;泄压箱隔间与稳压器隔间在氢气释放峰值阶段可能发生火焰加速现象。
- 氢气风险 /
- 氢气安全分析程序 /
- 安全壳 /
- 氢气复合器 /
- 严重事故
Abstract: This paper applies the three dimensional CFD code GASFLOW to simulate the behavior of hydrogen and steam under hypothetical LOFW+ATWS accident.Analysis shows that the average temperature and pressure are dominated by the inventory of the steam released to the containment.The calculation results also show that during the hydrogen release time,the average recombine rate of the hydrogen mitigation system can reach 40g/s,but the flame acceleration criterion in the code assess that the flame acceleration may occur in quench tank compartment and pressurizer compartment during hydrogen release peak.
- Hydrogen risk /
- GASFLOW /
- Containment /
- Recombiner /
- Severe accident