Parameters influencing the hydrogen concentration and distribution in cladding tubes after LOCA: results of bundle-scale experiments and modeling

摘要

In the framework of the KIT QUENCH-LOCA program three loss of coolant accident simulation tests at fuel rod bundle scale were performed so far. From the results of the posttest examinations and of model calculations parameters influencing the secondary hydriding were identified. In the paper the effects of temperature, gap width between pellets and inner cladding surface, cladding material, burst time and internal pressure at the beginning of the accident scenario are discussed.