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Science and Technology of Nuclear Installations
Volume 2011 (2011), Article ID 862812, 9 pages
Research Article

CFD Analysis of Passive Autocatalytic Recombiner

Reactor Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India

Received 10 May 2011; Revised 27 July 2011; Accepted 27 July 2011

Academic Editor: Iztok Tiselj

Copyright © 2011 B. Gera 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.


In water-cooled nuclear power reactors, significant quantities of hydrogen could be produced following a postulated loss-of-coolant accident (LOCA) along with nonavailability of emergency core cooling system (ECCS). Passive autocatalytic recombiners (PAR) are implemented in the containment of water-cooled power reactors to mitigate the risk of hydrogen combustion. In the presence of hydrogen with available oxygen, a catalytic reaction occurs spontaneously at the catalyst surfaces below conventional ignition concentration limits and temperature and even in presence of steam. Heat of reaction produces natural convection flow through the enclosure and promotes mixing in the containment. For the assessment of the PAR performance in terms of maximum temperature of catalyst surface and outlet hydrogen concentration an in-house 3D CFD model has been developed. The code has been used to study the mechanism of catalytic recombination and has been tested for two literature-quoted experiments.