This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1016/j.nucengdes.2013.10.021 in citations.
Passive auto-catalytic recombiners operation in the presence of hydrogen and carbon monoxide: Experimental study and model development
Passive auto-catalytic recombiners operation in the presence of hydrogen and carbon monoxide: Experimental study and model development
In a LWR severe accident, carbon monoxide (CO) may be generated inside the containment due to moltencorium concrete interaction (MCCI). As a component of the accident atmosphere, CO will interact withpassive auto-catalytic recombiners (PARs) which are installed inside LWR containments for hydrogen (...
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Personal Name(s): | Klauck, Michael (Corresponding author) |
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Reinecke, Ernst-Arndt / Kelm, Stephan / Meynet, Nicolas / Bentaïb, Ahmed / Allelein, Hans-Josef | |
Contributing Institute: |
Nukleare Entsorgung; IEK-6 |
Published in: | Nuclear engineering and design, 266 (2014) S. 137 - 147 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2014
|
DOI: |
10.1016/j.nucengdes.2013.10.021 |
Document Type: |
Journal Article |
Research Program: |
Safety Research for Nuclear Reactors |
Publikationsportal JuSER |
In a LWR severe accident, carbon monoxide (CO) may be generated inside the containment due to moltencorium concrete interaction (MCCI). As a component of the accident atmosphere, CO will interact withpassive auto-catalytic recombiners (PARs) which are installed inside LWR containments for hydrogen (H2)removal. Depending on the boundary conditions, CO may either react with oxygen to carbon dioxide (CO2)or act as catalyst poison, reducing the catalyst activity and hence the hydrogen conversion efficiency. Anew experimental test programme performed in co-operation between JÜLICH and RWTH investigatesthese aspects aiming at providing data for model development for advanced severe accident analyses.In the first test series presented here, the parallel catalytic reaction of H2and CO on the catalyst surfacehas been studied, i.e. the hydrogen recombination reaction was started before CO was injected. In total,33 steady state measurements have been performed. The test series was jointly evaluated by JÜLICH,RWTH and IRSN.The test results show that under the given conditions the conversion of CO into CO2has no negativeimpact on the parallel hydrogen conversion. The efficiency of the CO recombination in terms of molarrates is significantly smaller (by a factor of ∼2) than the corresponding H2conversion efficiency. Due tothe exothermal reaction, the parallel CO conversion may also have an impact on the possible ignition ofthe flammable gases at hot PAR surfaces.The authors have used three different numerical codes for the simulation of the parallel CO/H2recombi-nation. The codes REKO-DIREKT (JÜLICH/RWTH), SPARK (IRSN), and CFX (ANSYS) were able to capture theeffects observed in the experiments, providing a versatile basis for further investigations in this impor-tant safety issue. The different model approaches and additional enhancements in order to simulate theCO test series are described in the paper. |