Abstract
The main processes an.d phenomena which determine the possible thermal and mechanical consequences of hydrogen combustion are discussed. More recent large-scale combustion experiments executed within the Battelle model containment and the HDR containment facility are reviewed. The applicability of experimental findings to conditions expected during severe accidents in nuclear plants is discussed. The use of ignitors to eliminate the danger of a hydrogen explosion cannot at present be considered as a credible solution of the hydrogen problem. An analytical simulation model is being developed to study post-inerting procedures for large containment systems. First results indicate that low-temperature carbon dioxide gas injection promotes natural convection and promises uniform distribution of carbon dioxide within a reasonable time
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