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@INPROCEEDINGS{Reinecke:1022271,
      author       = {Reinecke, Ernst-Arndt and Nobrega, Gabriela and Klauck,
                      Michael},
      title        = {{E}xperiments on the impact of carbon monoxide on the
                      efficiency of catalysts used for hydrogen mitigation in the
                      late phase of a severe accident},
      reportid     = {FZJ-2024-01389},
      year         = {2023},
      abstract     = {The molten core-concrete interaction in the ex-vessel phase
                      of a severe accident in a light water reactor is the source
                      of significant amounts of carbon monoxide among other
                      gaseous products. The European project AMHYCO addresses open
                      issues related to the understanding of the impact of carbon
                      monoxide on phenomena occurring in the late accident phase.
                      One of these topics is related to the impact on the
                      operational behavior of passive auto-catalytic recombiners
                      (PARs). An experimental program alongside model development
                      activities aims to improve the predictive capabilities of
                      numerical models in order to assess the efficiency of PARs
                      as hydrogen mitigation measure.Experiments in the REKO-3
                      facility are being performed to study the impact of carbon
                      monoxide on both platinum-based and palladium-based
                      catalysts. Catalyst sheets are exposed to steady-state flows
                      of gaseous mixtures including hydrogen, oxygen, nitrogen,
                      steam and carbon monoxide inside a vertical flow reactor.
                      The boundary conditions are selected according to numerical
                      pre-studies in order to cover relevant ranges of gaseous
                      mixtures. Specific focus lies on mixtures with low amounts
                      of oxygen. Measurements of the catalyst temperature and the
                      outlet gas concentrations enable to assess the catalyst
                      activity and efficiency.The conference paper gives a
                      comprehensive overview of the work performed, introduces the
                      experimental facility, and highlights relevant
                      results.KEYWORDSSevere Accident, Hydrogen Mitigation,
                      Passive Auto catalytic Recombiners, Carbon Monoxide},
      month         = {Aug},
      date          = {2023-08-20},
      organization  = {20th International Topical Meeting on
                       Nuclear Reactor Thermal Hydraulics
                       (NURETH-20), Washington (USA), 20 Aug
                       2023 - 25 Aug 2023},
      cin          = {IEK-14},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {1422 - Beyond Design Basis Accidents and Emergency
                      Management (POF4-142)},
      pid          = {G:(DE-HGF)POF4-1422},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/1022271},
}