Open issues in the applicability of recombiner experiments and modelling to reactor simulations

Reinecke, Ernst-Arndt; Boutarfaïa, Ahmed; Kelm, Stephan; Jahn, W.; Meynet, N.; Caroli, C.

doi:10.1016/j.pnucene.2009.09.010

Cited by 63 publications

(24 citation statements)

References 8 publications

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“…] is the cross-section area of gas stream, Q v [m 3 /s] is the volumetric gas fl ow rate and v [m/s] stands for the gas velocity. Again, analysis of the results confi rms that hydrogen recombination is diffusion controlled.…”

Section: Resultsmentioning

confidence: 99%

“…[3] and [5][6][7][8][9]. Gas fl ow inside PAR was modelled either as laminar [5,6,8] or as turbulent one using the k- model [7] and the k- model [3,9].…”

Section: Modelling Of a Passive Autocatalytic Hydrogen Recombiner -A mentioning

confidence: 99%

“…: controlled ignition, catalytic recombination, forced and natural gas circulation, injection of neutral gas or venting of the safety containment [1]. Catalytic recombination of hydrogen with oxygen is a passive method, which is conducted in passive autocatalytic recombiners (PAR) consisting of a system of metal plates, grids or a granular bed covered by platinum or palladium catalysts [3]. Hydrogen and oxygen are adsorbed on the catalyst surface, and after the catalyst ignition they react producing water, which is then desorbed into the gas phase.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

Rożeń

2015

Nukleonika

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Abstract. Operation of a passive autocatalytic hydrogen recombiner (PAR) has been investigated by means of computational fl uid dynamics methods (CFD). The recombiner is a self-active and self-adaptive device used to remove hydrogen from safety containments of light water nuclear reactors (LWR) by means of a highly exothermic reaction with oxygen at the surface of a platinum or palladium catalyst. Different turbulence models (k-, k-, intermittency, RSM) were applied in numerical simulations of: gas fl ow, heat and mass transport and chemical surface reactions occurring in PAR. Turbulence was found to improve mixing and mass transfer and increase hydrogen recombination rate for high gas fl ow rates. At low gas fl ow rates, simulation results converged to those obtained for the limiting case of laminar fl ow. The large eddy simulation technique (LES) was used to select the best RANS (Reynolds average stress) model. Comparison of simulation results obtained for two-and three-dimensional computational grids showed that heat and mass transfer occurring in PAR were virtually two-dimensional processes. The effect of hydrogen thermal diffusion was also discussed in the context of possible hydrogen ignition inside the recombiner.

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Section: Resultsmentioning

confidence: 99%

“…[3] and [5][6][7][8][9]. Gas fl ow inside PAR was modelled either as laminar [5,6,8] or as turbulent one using the k- model [7] and the k- model [3,9].…”

Section: Modelling Of a Passive Autocatalytic Hydrogen Recombiner -A mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

Rożeń

2015

Nukleonika

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“…The goal is to further enhance the reliability of numerical models describing the operational behavior of PARs under relevant conditions. The experiments serve at solving open issues related to PAR modeling [27] including -PAR ignition -CO recombination -low-oxygen efficiency -PAR-aerosol interaction These facilities complement existing integral experimental programs which have been performed in the past (e.g. the French H2PAR and KALI experiments or the German BMC [23]), or which are still under operation (e.g.…”

Section: Operational Behavior Of Passive Auto-catalytic Hydrogen Recomentioning

confidence: 99%

Combined Analytical and Experimental Investigations for LWR Containment Phenomena

Allelein

Reinecke²,

Belt³

et al. 2012

Nuclear Engineering and Technology

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“…[3]- [6] However the technique takes an issue that PAR can be an igniter of hydrogen explosion instead of preventing when combustion occur in PAR. [7] In this study, a new shape of PAR structure is proposed, and analyzed to improve hydrogen reduction rates and reduce hydrogen explosion risk.…”

Section: Introductionmentioning

confidence: 99%

Effect of PAR Structure on Hydrogen Reduction Rate and Explosion Risk

Ryu¹,

Park

2016

Advanced Science and Technology Letters

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Abstract. Nuclear power plant is again concerned about a sever accident due to the Fukushima accident by hydrogen explosions. Hydrogen is produced by the reaction of the fuel rod coating material and water vapor in a very high ambient temperature, which condition is generated with the heat of the fuel. If the hydrogen is not removed sufficiently, that will be a principal cause of a hydrogen explosion. One of countermeasures to remove hydrogen is Passive Autocatalytic Recombiner (PAR). However, it was brought up that the spontaneous ignition on the hot surface inside the PAR could lead to hydrogen explosion. In this study a new design concept of the catalyst structure is proposed and analyzed. The results showed that the proposed structure of a catalyst reduced the hot temperature area which might reduce the hydrogen explosion risk.

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Open issues in the applicability of recombiner experiments and modelling to reactor simulations

Cited by 63 publications

References 8 publications

Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

Combined Analytical and Experimental Investigations for LWR Containment Phenomena

Effect of PAR Structure on Hydrogen Reduction Rate and Explosion Risk

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