Voltar
Artigo Acesso aberto Produção Nacional Revisado por pares
BIBTEX RIS

Effect of grain-boundaries on uranium and oxygen diffusion in polycrystalline UO2

2000; Elsevier BV; Volume: 278; Issue: 2-3 Linguagem: Inglês

10.1016/s0022-3115(99)00250-0

ISSN

1873-4820

Autores

Antônio Claret Soares Sabioni, Wilmar Barbosa Ferraz, F. Millot,

Tópico(s)

Nuclear reactor physics and engineering

Resumo

The influence of grain-boundaries on uranium and oxygen diffusion in polycrystalline UO2 has been investigated. Our results show that between 1498°C and 1697°C, in H2 atmosphere, uranium diffusion in UO2 grain-boundaries is about five orders of magnitude greater than uranium volume diffusion, in the same experimental conditions. Between 605°C and 750°C, in H2/N2/H2O atmosphere, the oxygen diffusion coefficients measured in polycrystalline and single crystalline UO2 are similar, and correspond to the volume diffusion.

Referência(s)