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首页> 外文会议>International meeting on severe accident assessment and management 2012: Lessons learned from fukushima dai-ichi >POST-ACCIDENT ANALYSIS OF HYDROGEN EXPLOSION DURING FUKUSHIMA DAIICHI ACCIDENT
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POST-ACCIDENT ANALYSIS OF HYDROGEN EXPLOSION DURING FUKUSHIMA DAIICHI ACCIDENT

机译：福岛大池事故期间​​氢气爆炸的事后分析

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Hydrogen mixing and combustion in containment of Nuclear Power Plant (NPP) is one of the important issues of severe accident scenario. Different flame propagation regimes from slow subsonic to relative fast sonic flames and then to the detonations may develop depending on geometry of reactor building and mixture composition. It may lead to different strength of blast wave and effect on surrounding objects. This allows to resolve an inverse problem to evaluate amount of combustible gas knowing strength of blast wave. A post-accident analysis of Fukushima accident was done with respect to evaluate amount of hydrogen released due to reaction of molten core with water. A thermodynamic analysis of high pressure release of steam and hydrogen from reactor vessel was done with respect to evaluate the mixture composition inside the reactor building. It was found that 80 to 200 kg of hydrogen have been involved into the explosion with formation of relative strong shock wave. A fast deflagration was assumed to be the most probable explosion regime with 800 kg of TNT equivalent. The effect of blast wave from such explosion on structures and biological objects was evaluated. The objective of current work was to evaluate amount of hydrogen involved into the explosion process, to define combustion regime and effect of blast wave on environmental objects, structures and humans. The main outcome of the work was to demonstrate how to utilize scaling correlations, experimental data analysis and numerical codes for accident and safety analysis.
机译：核电站安全壳内的氢气混合和燃烧是严重事故场景的重要问题之一。从慢速亚声速到相对快的声速火焰，然后到爆炸，可能会出现不同的火焰传播方式，具体取决于反应堆构造的几何形状和混合物组成。可能会导致爆炸波强度不同，并对周围物体产生影响。这允许解决反问题，以在知道爆炸波的强度的情况下评估可燃气体的量。对福岛事故的事后分析进行了评估，以评估由于熔融岩心与水反应而释放的氢气量。对反应堆容器中蒸汽和氢气的高压释放进行了热力学分析，以评估反应堆建筑物内的混合物组成。发现爆炸中涉及了80至200 kg的氢，形成了较强的冲击波。快速爆燃被认为是最可能的爆炸形式，相当于800千克TNT。评估了这种爆炸产生的爆炸波对结构和生物物体的影响。当前工作的目的是评估爆炸过程中涉及的氢气量，以确定燃烧方式和爆炸波对环境物体，结构和人体的影响。这项工作的主要成果是演示如何利用标度相关性，实验数据分析和数字代码进行事故和安全性分析。

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