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| Home > Publications database > Validation of the PARUPM and GOTHIC 8.3 code coupling using THAI hydrogen recombination tests |
| Home > Publications database > Validation of the PARUPM and GOTHIC 8.3 code coupling using THAI hydrogen recombination tests |
| Abstract | FZJ-2025-01682 |
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2024
Abstract: In case of a severe accident in a nuclear power plant (NPP), large amounts of H2 and CO could be generated,potentially leading to uncontrolled combustion if concentrations within the flammability thresholds arereached. To mitigate this hazard, many NPPs equipped their containment buildings with passiveautocatalytic recombiners (PARs). PARs are capable of recombining combustible gases such as H2 or COwith oxygen, resulting in the production of steam and/or CO2, even when gas concentrations fall below theflammability threshold.The AMHYCO project (Euratom 2019-2020, GA Nº 945057) aims to advance experimental understandingand simulation capabilities for H2/CO combustion risk management in severe accidents. Within theframework of this project, the computational model PARUPM, which uses a physicochemical approach tosimulate PARs, has been validated as a standalone tool using experimental data obtained from both theREKO-3 flow channel at FZJ and the OECD/NEA THAI projects executed at Becker Technologies GmbH.In a next phase, PARUPM has been integrated as an add-on program within the thermohydraulic simulationcode GOTHIC. This code coupling facilitates the evaluation of the interaction between the operation ofPARs and the surrounding atmosphere in which they are located.The present paper provides an overview of the capabilities of the joint simulation with PARUPM – GOTHIC8.3. The coupling to GOTHIC has been validated based on a sequence of experiments on H2 recombinationby PARs performed at the THAI experimental facility. The relevant feedback from the THAI vessel to therecombiners performance involving gas stratification and change of boundary conditions is studied by a 3Dmodel which reproduces the complex behaviour of gases inside the THAI vessel during the experiments.
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