Passive Autocatalytic Recombiners (PAR) are used as a mitigation measure for hydrogen risk in pressurized water reactors (PWR). They aim to remove hydrogen by its exothermic catalytic recombination into steam, and to maintain local hydrogen concentration below deflagration-detonation transition limit. This study deals with PAR efficiency for removing hydrogen and mixing containment atmosphere, according to their location inside the containment. The competition of physical phenomena as free and forced convection and condensation is considered on the basis of simplified geometry and scenarios.

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