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Science and Technology of Nuclear Installations
Volume 2011 (2011), Article ID 574514, 13 pages
http://dx.doi.org/10.1155/2011/574514
Research Article

CFD Recombiner Modelling and Validation on the H2-Par and Kali-H2 Experiments

1R&D Division, Electricité de France, 6 Quai Watier, 78400 Chatou, France
2INCKA, 85 avenue Pierre Grenier, 92100 Boulogne, France

Received 14 March 2011; Revised 29 April 2011; Accepted 6 May 2011

Academic Editor: Giorgio Galassi

Copyright © 2011 Stéphane Mimouni et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A large amount of Hydrogen gas is expected to be released within the dry containment of a pressurized water reactor (PWR), shortly after the hypothetical beginning of a severe accident leading to the melting of the core. According to local gas concentrations, the gaseous mixture of hydrogen, air and steam can reach the flammability limit, threatening the containment integrity. In order to prevent mechanical loads resulting from a possible conflagration of the gas mixture, French and German reactor containments are equipped with passive autocatalytic recombiners (PARs) which preventively oxidize hydrogen for concentrations lower than that of the flammability limit. The objective of the paper is to present numerical assessments of the recombiner models implemented in CFD solvers NEPTUNE_CFD and Code_Saturne. Under the EDF/EPRI agreement, CEA has been committed to perform 42 tests of PARs. The experimental program named KALI-H2, consists checking the performance and behaviour of PAR. Unrealistic values for the gas temperature are calculated if the conjugate heat transfer and the wall steam condensation are not taken into account. The combined effects of these models give a good agreement between computational results and experimental data.