Passive auto-catalytic recombiners operation in the presence of hydrogen and carbon monoxide: Experimental study and model development

Klauck, Michael; Reinecke, Ernst-Arndt; Kelm, Stephan; Meynet, N.; Boutarfaïa, Ahmed; Allelein, Hans-Josef

doi:10.1016/j.nucengdes.2013.10.021

Cited by 39 publications

(14 citation statements)

References 9 publications

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“…Hence, besides the formation of CO-Pd and S-Pd by dissociation of COS, it is likely that oxygen and hydrogen also chemisorb to Pd. 54 Consequently 55 and also shown in this work, for the same reason, the oxygen-hydrogen reaction is inhibited.…”

Section: Catalysis Science and Technologysupporting

confidence: 84%

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Kamp

Thielert

Morstein

et al. 2020

Catal. Sci. Technol.

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Section: Catalysis Science and Technologysupporting

confidence: 84%

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Kamp

Thielert

Morstein

et al. 2020

Catal. Sci. Technol.

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“…Another important parameter characteristic to the PAR operation is the start-up time (TDHPAR) which is the time needed for the system to warm-up before the PAR can be fully functional. In the parameter file, the recommended value is 5-10 minutes based on reference [29].…”

Section: Par Implementationmentioning

confidence: 99%

Verification of the Efficacy of Passive Autocatalytic Recombiners in a Typical Pressurized Water Reactor under a Station Blackout Condition

Hong

Cho

Kim

et al. 2022

Science and Technology of Nuclear Installations

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The presence of a stable stratified gas cloud inside the containment near or at the flammability limit may lead to deflagration or even detonation which may challenge the containment and cause a radioactive material release into the environment. To mitigate this risk, a number of approaches have been proposed, for example, containment inerting or venting and use of passive autocatalytic recombiners or igniters. However, for these measures to be effective, a thorough analysis of the hydrogen dispersion and associated phenomena is indispensable during the design phase as well as the mitigation phase during a severe accident. In this work, a MAAP analysis is performed to assess the hydrogen risk in a typical pressurized water reactor (PWR) containment. An extended station blackout (SBO) was chosen as an initiating event given its high contribution to the core damage frequency. RCS depressurization and external injection are mitigation techniques implemented consecutively to extend the coping capability of the plant for the extended SBO scenario. A sensitivity study is performed to select the combination of timing and flow rate that generate the most severe case for the “in-vessel phase of hydrogen generation.” Subsequently, a number of passive autocatalytic recombiners (PARs) were implemented to mitigate the hydrogen risk during the first three days of the accident. The Shapiro diagram is used to assess the flammability condition of the containment atmosphere based on MAAP analysis. The results show that the gas mixture composition is acceptable in the majority of the containment compartments and only marginally acceptable in the cavity. Even under the conservative conditions of the accident, the simulation results confirmed the sufficiency of recombiners alone without igniters in the low hydrogen concentration zones, while for compartments close to the sources, additional mitigation may be needed.

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“…The use of this model for the analysis of REKO [14] and THAI [15] experiments allows the determination of the ignition limits induced by PARs. The ongoing collaboration between IRSN and JULICH are permitting the improvement of the SPARK model [13], the investigation of the effect of carbon monoxide on hydrogen recombination [16] and the effect of fire products on recombination start up.…”

Section: 2mentioning

confidence: 99%

Overview on hydrogen risk research and development activities: Methodology and open issues

Boutarfaïa

Meynet

Bleyer

2015

Nuclear Engineering and Technology

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a b s t r a c tDuring the course of a severe accident in a light water nuclear reactor, large amounts of hydrogen can be generated and released into the containment during reactor core degradation. Additional burnable gases [hydrogen (H 2 ) and carbon monoxide (CO)] may be released into the containment in the corium/concrete interaction. This could subsequently raise a combustion hazard. As the Fukushima accidents revealed, hydrogen combustion can cause high pressure spikes that could challenge the reactor buildings and lead to failure of the surrounding buildings. To prevent the gas explosion hazard, most mitigation strategies adopted by European countries are based on the implementation of passive autocatalytic recombiners (PARs). Studies of representative accident sequences indicate that, despite the installation of PARs, it is difficult to prevent at all times and locations, the formation of a combustible mixture that potentially leads to local flame acceleration.Complementary research and development (R&D) projects were recently launched to understand better the phenomena associated with the combustion hazard and to address the issues highlighted after the Fukushima Daiichi events such as explosion hazard in the venting system and the potential flammable mixture migration into spaces beyond the primary containment. The expected results will be used to improve the modeling tools and methodology for hydrogen risk assessment and severe accident management guidelines.The present paper aims to present the methodology adopted by Institut de Radioprotection et de Sû ret e Nucl eaire to assess hydrogen risk in nuclear power plants, in particular French nuclear power plants, the open issues, and the ongoing R&D programs related to hydrogen distribution, mitigation, and combustion.

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Passive auto-catalytic recombiners operation in the presence of hydrogen and carbon monoxide: Experimental study and model development

Cited by 39 publications

References 9 publications

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Verification of the Efficacy of Passive Autocatalytic Recombiners in a Typical Pressurized Water Reactor under a Station Blackout Condition

Overview on hydrogen risk research and development activities: Methodology and open issues

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Passive auto-catalytic recombiners operation in the presence of hydrogen and carbon monoxide: Experimental study and model development

Cited by 39 publications

References 9 publications

Investigation on the simultaneous removal of COS, CS2and O2from coke oven gas by hydrogenation on a Pd/Al2O3catalyst

Investigation on the simultaneous removal of COS, CS2and O2from coke oven gas by hydrogenation on a Pd/Al2O3catalyst

Verification of the Efficacy of Passive Autocatalytic Recombiners in a Typical Pressurized Water Reactor under a Station Blackout Condition

Overview on hydrogen risk research and development activities: Methodology and open issues

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Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst