Passive Hydrogen Recombination during a Beyond Design Basis Accident in a Fusion DEMO Plant

One of the most important environmental and safety concerns in nuclear fusion plants is confinement radioactive substances into reactor buildings during both normal operations accidental conditions. For this reason, hydrogen build-up subsequent ignition must be avoided, since pressure energy generated may threaten integrity structures, causing dispersion toxic products toward public environment. Potentially dangerous sources are related to exothermal oxidation reactions between steam plasma-facing components or hot dust, which could occur accidents such as in-vessel loss coolant a wet bypass. The research technical solutions avoid risk explosion large power still progress. In environment work package EUROfusion consortium, activities ongoing study mitigate risk. main objective preclude occurrence flammable gas mixtures. identified solution deal with installation passive autocatalytic recombiners atmosphere vacuum vessel suppression system tanks. A model control PARs recombination capacity function thermal-hydraulic parameters tanks has been modeled MELCOR. This paper aims test theoretical effectiveness PAR intervention an accident without decay heat removal for Water-Cooled LithiumLead concept EU-DEMO.