Abstract
In order to obtain fundamental perspectives on fuel cladding deformation behavior under changing temperature and pressure conditions in a hypothetical loss-of-coolant accident of PWR, Zircaloy-4 tube burst test was conducted in both air and 99.97, Ar atmospheres. The tubes were directly heated by ac-current and maintained at various temperatures, and pressurized gradually until rupture occurred. Rupture circumferential strains were generally larger in Ar gas than in air and attained a maximum around 1, 120 K in both atmospheres. Some tubes tested in air produced axially-extended long balloons, which proved net to be explained by such properties or ideas as effect of cooling on strain rate, superplasticity, geometrical plastic instability and stresses generated by surface oxide layer. A cause of the long balloon may be obtained in the anisotropy of the material structure. But even a qualitative analysis based on this property can not be made due to insufficient data of the anisotropy.
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