严重事故下喷淋模式的研究

核电厂发生严重事故后．安全壳内有可能堆积大量的氢气．如果此时不适宜地投入喷淋．会破坏安全壳内的惰性环境而引起氢气燃烧或者爆炸．甚至导致安全壳失效。为避免氢燃．本文通过合理的假设．根据相关的实验公式推导出不同氢气产量下安全壳内压力所需满足的条件，获得了根据安全壳内压力值来指导喷淋开闭的保守的控制模式。本文以大亚湾核电站为分析对象，利用MELCOR来进行分析．验证了此控制模式的可行性．并讨论了堆腔注水、氢气自燃以及安全壳底板成分对制订喷淋模式的影响。

Study on Spray Model during Severe Accidents

In case of severe accident of PWR, large amount of hydrogen may accumulate in the con- tainment. Unsuitable action of containment spray system will change the inert environment of containment, and cause hydrogen challenge or detonation that may challenge the integrity of containment. The condition of the containment pressure for avoiding hydrogen combustion, at different amount of hydrogen, is concluded based on reasonable assumptions and experimental correlations of hydrogen detonation. One conservative spraying mode, upon which spraying pump is manually turned on or off with containment pressure, is pro- posed in this paper. The analysis results aiming at DAYA Bay Nuclear Power Plant by using MELCOR show that the operation mode is feasible. The impact of pit flooding, spontaneous hydrogen combustion and con- tainment basement compositions on the spraying mode is also analyzed in this paper.