Qualification of a Passive Catalytic Module for Hydrogen Mitigation

Fischer, K.

doi:10.13182/nt95-a15851

Cited by 17 publications

(6 citation statements)

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“…Numerical models describing PAR operation within comprehensive computational codes are typically based on empirical equations which correlate the relevant parameters, e.g., hydrogen concentration and total pressure, with the hydrogen recombination rate (AECL [1], FRA-ANP [5], NIS [6]). Regardless of their advantages in terms of computational efforts, their applicability is limited to boundary conditions similar to the underlying validation database.…”

Section: Parupm Modelmentioning

confidence: 99%

PARUPM: A simulation code for passive auto-catalytic recombiners

Domínguez-Bugarín

Jiménez

Reinecke

et al. 2022

EPJ Nuclear Sci. Technol.

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In the event of a severe accident with core damage in a water-cooled nuclear reactor, combustible gases (H2 and possibly CO) get released into the containment atmosphere. An uncontrolled combustion of a large cloud with a high concentration of combustible gases could lead to a threat to the containment integrity if concentrations within their flammability limits are reached. To mitigate this containment failure risk, many countries have proceeded to install passive auto-catalytic recombiners (PARs) inside containment buildings. These devices represent a passive strategy for controlling combustible gases, since they can convert H2 and CO into H2O and CO2, respectively. In this work, the code PARUPM developed by the Department of Energy Engineering at the UPM is described. This work is part of the AMHYCO project (Euratom 2014–2018, GA No. 945057) aiming at improving experimental knowledge and simulation capabilities for the H2/CO combustion risk management in severe accidents (SAs). Thus, enhancing the available knowledge related to PAR operational performance is one key point of the project. The PARUPM code includes a physicochemical model developed for the simulation of surface chemistry, and heat and species mass transfer between the catalytic sheets and gaseous mixtures of hydrogen, carbon monoxide, air, steam and carbon dioxide. This model involves a simplified Deutschmann reaction scheme for the surface combustion of methane, and the Elenbaas analysis for buoyancy-induced heat transfer between parallel plates. Mass transfer is considered using the heat and mass transfer analogy. By simulating the recombination reactions of H2 and CO inside the catalytic section of the PAR, PARUPM allows studying the effect of CO on transients related to accidents that advance towards the ex-vessel phase. A thorough analysis of the code capabilities by comparing the numerical results with experimental data obtained from the REKO-3 facility has been executed. This analysis allows for establishing the ranges in which the code is validated and to further expands the capabilities of the simulation code which will lead to its coupling with thermal-hydraulic codes in future steps of the project.

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Section: Parupm Modelmentioning

confidence: 99%

PARUPM: A simulation code for passive auto-catalytic recombiners

Domínguez-Bugarín

Jiménez

Reinecke

et al. 2022

EPJ Nuclear Sci. Technol.

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“…Large scale vented containment test facility (Canada/AECL) [36] Battelle model containment (Germany/Battelle) [37] KALI (CEA) [38] H2PAR (CEA) [39] (13) Hydrogen combustion (i) Autoignition temperaturez…”

Section: Managing Analytical Capabilitymentioning

confidence: 99%

An Evaluation Methodology Development and Application Process for Severe Accident Safety Issue Resolution

Martin

2012

Science and Technology of Nuclear Installations

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A general evaluation methodology development and application process (EMDAP) paradigm is described for the resolution of severe accident safety issues. For the broader objective of complete and comprehensive design validation, severe accident safety issues are resolved by demonstrating comprehensive severe-accident-related engineering through applicable testing programs, process studies demonstrating certain deterministic elements, probabilistic risk assessment, and severe accident management guidelines. The basic framework described in this paper extends the top-down, bottom-up strategy described in the U.S Nuclear Regulatory Commission Regulatory Guide 1.203 to severe accident evaluations addressing U.S. NRC expectation for plant design certification applications.

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“…PAR device models for predictive safety analysis within integral computational codes have been traditionally based on empirical expressions correlating the main parameters: AECL (Bachellerie, 2002), FRA-ANP (Mohaved, 1994) and (Carcassi, 1997), NIS (Fischer, 1995), (Carcassi, 1997) and (Sher, 1997).…”

Section: Physical Model Of a Parallel-plate Recombinermentioning

confidence: 99%

“…By reasons of consistency with the variable database in the code, the numerical has been transformed into real variable precision, hence by using the SGETRF, SGETRI, SGEMV, etc… libraries from LAPack. Model coupling has been performed with minimum modifications, in order to keep the current abilities of MELCOR, in such way that variable input needed for the proposed model (gas composition in terms of mole fractions, temperature and pressure) are the same as the currently implemented model by Fischer (Gauntt, 2000) and (Fischer, 1995). Specific parameters needed for the model proposed (number of plates, L, b, h, e, ρ plate , c p ) are introduced via MELCOR input file with the inclusion of a new flag IPROPT < 0.…”

Section: Implementation Into the Melcor Codementioning

confidence: 99%

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

Jiménez¹,

Martín-Valdepeñas²,

Martín-Fuertes³

et al. 2007

Nuclear Engineering and Design

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A detailed chemistry model has been adapted and developed for surface chemistry, heat and mass transfer between H 2 /CO/air/steam/CO 2 mixtures and vertical parallel Pt-coated surfaces. This model is based onto a simplified Deutschmann reaction scheme for methane surface combustion and the analysis by Elenbaas for buoyancy-induced heat transfer between parallel plates. Mass transfer is treated by the heat and mass transfer analogy. The proposed model is able to simulate the H 2 /CO recombination phenomena characteristic of parallel-plate Passive Autocatalytic Recombiners (PARs), which have been proposed and implemented as a promising hydrogen-control strategy in the safety of nuclear power stations or other industries. The transient model is able to approach the warm-up phase of the PAR and its shut-down as well as the dynamic changes within the surrounding atmosphere. The model has been implemented within the MELCOR code and assessed against results of the Battelle Model Containment tests of the Zx series. Results show accurate predictions and a better performance than traditional methods in integral codes, i.e., empirical correlations, which are also much case-specific. Influence of CO present in the mixture on the PAR performance is also addressed in this paper.

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Qualification of a Passive Catalytic Module for Hydrogen Mitigation

Cited by 17 publications

References 0 publications

PARUPM: A simulation code for passive auto-catalytic recombiners

PARUPM: A simulation code for passive auto-catalytic recombiners

An Evaluation Methodology Development and Application Process for Severe Accident Safety Issue Resolution

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

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