At reactor accidents, the combustion of hydrogen causes pressure and temperature transients which pose supplementary loads in containment. In certain conditions, they could be at hazardous levels and impair die integrity of the containment and the operability of the safety systems. The mechanisms of the chemical reactions specific for die hydrogen-oxygen system are presented ir 3hap. 2. The conditions in which a burning can occur and the various combustion modes, including the transition to detonation are also described. In Chap. 3 the related safety aspects and mitigation methods are discussed. Examples for particular applications and safety approaches for various types of reactors, included those promoted for the advanced reactors are also given. Chap. 4 is dedicated to the presentation of the experimental research completed at AECL-Research, Whiteshell Laboratory, where the multi-point ignition effects for constant volume and for vented combustion of dry hydrogen-air mixtures in various geometries have been investigated. Various aspects of modelling and simulation for the hydrogen burning are discussed in Chap. 5. The adaptations and the new models implemented in the codes VENT and CONTAIN, aimed to broaden the simulation capabilities of their hydrogen combustion models are described. The capabilities and the limits of the modelling assumptions of these two codes are also evaluated.
|Place of Publication||Roskilde|
|Publisher||Risø National Laboratory|
|Number of pages||79|
|Publication status||Published - 1993|
|Series||Denmark. Forskningscenter Risoe. Risoe-R|