Photo by mbaumi from unsplash
Abstract Amounts of hydrogen is generated and released into the containment during the course of severe accidents in AP1000 nuclear power plant. It is very important to study the measures… Click to show full abstract
Abstract Amounts of hydrogen is generated and released into the containment during the course of severe accidents in AP1000 nuclear power plant. It is very important to study the measures to reduce the risk of hydrogen in containment. The severe accident analysis code is used to study the hydrogen and water vapor source terms during hypothesized severe accident induced by LB-LOCA with gravity injection failure in advanced passive PWR containment. Then, assuming the two sets of hydrogen igniter are all out of power and the passive hydrogen recombiners are functioning normally, we use the three-dimensional computational fluid dynamics code GASFLOW to study the influence of inert gas injection point on mitigating hydrogen risk during post-inerting. It shows that gaseous CO2 is suitable to be used as inert gas. In the process of post-inerting, Inert gas injection point should be below the hydrogen source. Inert gas enhances the hydrogen diffusion and mixing, and reduces the local hydrogen risk in the containment.