European research on issues concerning hydrogen behaviour in containment within the SARNET network of excellence

The paper describes European research on issues con cerni g hydrogen behaviour in containment within the SARNET network of excellence . Th hydrogen combustion and associated risk mitigation have been studied, concentrating on the formation of combustible gas mixtures in containments, its local gas composition and potenti al combustion modes, including the reaction kinetics inside catalytic recombiners. The potentia l hydrogen distribution in different parts of the containment has been investigated, with the objecti v of assessing the formation of combustible gas mixtures taking into account the effect of miti gation systems such as sprays or recombiners. Due to its influence on hydrogen distribution, stea m condensation is also being investigated.