[en] The creep/creep rupture anisotropic properties of zircaloy were determined and compared by analytical techniques with ramp pressure and ramp temperature tests results. Tests in this phase of the program were selected to supplement those results obtained in the initial stages of the program. Additional tests were performed at temperature levels of 1500⁰F (1088 K), 1550⁰F (1116 K), 1600⁰F (1144K), 1650⁰F (1172 K), 1700⁰F (1200 K), and 1800⁰F (1255 K) in an oxygen--argon atmosphere. Stress levels ranging from 40-98% of the ultimate tensile stress were used for the majority of the tests at each temperature level using a biaxial internal pressure loading technique. The combination of test results and predictive analysis techniques that are shown make it possible to predict the transient deformation of reactor fuel cladding during simulated LOCA conditions