Abstract
The chemical form of the fission product tellurium during a reactor accident has been studied experimentally. Release experiments of tellurium were conducted under simulated LWR accident conditions. It is found that tellurium is retained by the Zircaloy cladding until oxidation of the cladding is almost complete. During this oxidation, tin in the cladding is segregated and reacts with tellurium. The release of tellurium is found to be dependent on the oxygen potential. High oxygen potentials lead to a release as elemental tellurium, low oxygen potentials lead to a release as tin telluride.
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