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AbstractAbstract
[en] The main phenomena leading to hydrogen generation in the containment of a PWR in accident conditions are described in this report. They are the following: water radiolysis, zirconium cladding oxidation and oxidation of the aluminium of internal structures present in the containment. After studying the mechanisms and kinetics of these chemical reactions, the total amount of hydrogen which is generated is evaluated, for the design basis accident and in the event of two hypothetical accidents involving a highly degraded core. The various mechanisms of hydrogen distribution in the containment are examined, as well as the criteria for the inflammability of air/hydrogen/steam mixtures. In all the cases of considered accidents, the containment atmosphere cannot be totally detonating, but possibilities for hydrogen accumulation and local detonation exist
[fr]
Ce rapport expose les principaux phenomenes conduisant a la generation d'hydrogene dans l'enceinte de confinement d'un reacteur nucleaire a eau pressurisee en situation accidentelle: la radiolyse de l'eau, l'oxydation du zirconium des gaines de combustible et l'oxydation de l'aluminium de structure present dans l'enceinte du reacteur. Apres un examen des mecanismes et des cinetiques de ces reactions chimiques, la quantite totale d'hydrogene produite est evaluee, dans le cas de l'accident de dimensionnement et dans deux cas d'accidents hypothetiques impliquant une forte degradation du coeur. Les differents mecanismes de repartition de l'hydrogene dans l'enceinte sont examines ainsi que les criteres d'inflammabilite des melanges air/hydrogene/vapeur d'eau. Dans tous les cas d'accidents consideres, l'atmosphere de l'enceinte ne peut pas etre totalement detonante, mais il existe des possibilites d'accumulation d'hydrogene et de detonation localeOriginal Title
Etude de la production et du comportement de l'hydrogene dans un reacteur nucleaire a eau pressurisee en situation accidentelle
Primary Subject
Secondary Subject
Source
Jul 1982; 203 p; These (3e Cycle).
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ACCIDENTS, CHEMICAL RADIATION EFFECTS, CHEMICAL REACTIONS, COMPUTER CODES, DECOMPOSITION, ELEMENTS, EXPLOSIONS, HYDROGEN COMPOUNDS, KINETICS, METALS, NONMETALS, OXYGEN COMPOUNDS, RADIATION EFFECTS, REACTION KINETICS, REACTOR ACCIDENTS, REACTORS, SIMULATION, TRANSITION ELEMENTS, WATER COOLED REACTORS, WATER MODERATED REACTORS
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