Abstract
The present chapter provides an overview of the issue of hydrogen combustion risk in a nuclear power plant (NPP) containment during a severe accident. It provides an understanding of how hydrogen is generated in a LWR NPP during a severe accident. Based on this understanding, it demonstrates how the generated hydrogen can form flammable mixtures in the reactor's subcompartments or in the containment. Following this, it highlights the conditions in which hydrogen combustion is expected to occur during a severe accident in a nuclear power plant (NPP). The chapter also discusses the different modes of hydrogen combustion and the respective threats that they create. Furthermore, it sheds light on the currently employed safety systems, which are expected to mitigate the hydrogen combustion risk in NPPs during a hypothetical severe accident. The experimental investigations that have been performed to date on distribution and combustion of hydrogen are detailed. Finally, the chapter takes a look at the theoretical methods that are being used to predict hydrogen distribution and combustion during a hypothetical severe accident.
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