Parametric Study of Phenomena Influencing Secondary Hydriding During LOCA Transients
摘要
Secondary hydriding may occur during Loss of Coolant Accidents (LOCA) when nuclear fuel cladding is exposed to steam at high temperature. Indeed, during a LOCA, the cladding may burst, and the steam ingress results in cladding inner surface oxidation. The hydrogen released during this oxidation can be partly absorbed by the cladding, leading to a localized high hydrogen content. This study aims at characterizing the influence of different parameters on the maximum hydrogen content, localization and distribution regarding secondary hydriding. The oxidation duration has been studied using an axisymmetric testing procedure reproducing LOCA conditions. Metallographic analysis and hydrogen measurements have been performed. EPMA and µ-LIBS micro-analysis have been used to map oxygen and the hydrogen local content.