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Hydrogen removal from LWR containments by catalytic-coated thermal insulation elements (THINCAT)

Type of Publication
Year of Publication
2003
Authors

K. Fischer; P. Broeckerhoff; G. Ahlers; V. Gustavsson; L. Herranz; J. Polo; T. Dominguez; P. Royl

Abstract

In the THINCAT project, an alternative concept for hydrogen mitigation in a light water reactor (LWR) containment is being developed. Based on catalytic coated thermal insulation elements of the main coolant loop components, it could be considered either as an alternative to backfitting passive autocatalytic recombiner devices, or as a reinforcement of their preventive effect. The present paper summarises the results achieved at about project mid-term. Potential advantages of catalytic thermal insulation studied in the project are: reduced risk of unintended ignition, no work space obstruction in the containment, no need for seismic qualification of additional equipment, improved start-up behaviour of recombination reaction. Efforts to develop a suitable catalytic layer resulted in the identification of a coating procedure that ensures high chemical reactivity and mechanical stability. Test samples for use in forthcoming experiments with this coating were produced. Models to predict the catalytic rates were developed, validated and applied in a safety analysis study. Results show that an overall hydrogen concentration reduction can be achieved which is comparable to the reduction obtained using conventional recombiners. Existing experimental information supports the argument of a reduced ignition risk. (C) 2002 Elsevier Science B.V. All rights reserved.

DOI

10.1016/s0029-5493(02)00348-5

Volume

221

Notes

Times Cited: 7 Polo, Jesus/O-4639-2014 Polo, Jesus/0000-0003-2431-2773 Mid-Term Symposium on Shared-Cost and Concerted Actions (FISA-2001) Dec, 2001 Luxembourg 7

Pagination

137-149

Number
3
ISSN Number

0029-5493

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