Creep deformation of zircaloy fuel cladding under dry storage condition

In this report, creep deformation behavior of zircaloy-4 nuclear fuel cladding was investigated under dry storage condition with relatively low stress level (internal pressure range from 35 to 70 atm. at room temperature). Testing time was up to 7400 hours. The results obtained were as follows; (1) There was no effect of oxidizing atomospher on the creep deformation characteristic of zircaloy-4 at temperature range 304 to 402 degree centigrade. (2) Strain hardening rule was applicable to creep deformation under stress and temperature fluctuating condition. (J.P.N.)