[en] Sensitivity studies of five postulated reactor transient and accident events were performed with the FRAP-T4 transient fuel behavior code. The purpose of the study was to determine the influence of variation in selected input parameters on fuel performance characteristics. The range of the parameters perturbed during the study were supplied by the major US reactor vendors. The five different events examined in the analysis were: (1) locked rotor, (2) control element ejection, (3) steam line break, (4) loss of flow, and (5) turbine trip without bypass