Hydrogen Risk Assessment in SAMG and Simulation

In this paper,a tool used in SAMG to assess the hydrogen flammability and hydrogen impact when depressurizing containment is built.The station black out scenario is simulated with code,and hydrogen risks at different phase of the accident are analyzed.The results show that in the SBO scenario without hydrogen recombiners,the atmosphere will be inerted by steam for a while.But if the power recovers,and the containment is depressurized by spray,there will be risk of hydrogen burn and overpressure.In the scenario with hydrogen recombiners,there is no risk of overpressure,and the result is conservative.