Results of the QUENCH-16 Bundle Experiment on Air Ingress (KIT Scientific Reports ; 7634)

Beschreibung

The out-of-pile bundle experiment QUENCH-16 on air ingress was conducted in the electrically heated 21-rod QUENCH facility at KIT in July 2011. The oxidation of the Zircaloy-4 claddings in air following a limited pre-oxidation in steam was examined. Three contributors for intensive hydrogen production during the final reflood were identified: 1) re-oxidation of nitrides, 2) secondary oxidation of cladding metal by steam penetrated through the porous re-oxidized scales and 3) melt oxidation.

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Juri Stuckert

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severe accident hydrogen source term zirconium nitride core reflood oxygen starvation

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