[en] Under a program sponsored by the Electric Power Research Institute, Combustion Engineering is investigating the feasibility of a post-DNB fuel design limit which could result in improved reactor performance and availability. As a part of this study, an empirical model for transient fission gas release has been developed and applied in the analysis of anticipated PWR transients. The fission gas release model is based on measurements of gas release from pre-irradiated fuel samples which were exposed to simulated transients in the Direct Electrical Heating (DEH) Tests at the Argonne National Laboratory. The fuel samples were obtained from H. B. Robinson-2 commercial fuel rods which had achieved peak burnups of 29.5 MWd/kgU at peak linear heat generation rates of 22.4 kW/m. Detailed temperature histories from nine of these tests were used in the derivation of an empirical correlation of transient fission gas release. Local fuel temperature and time at that temperature are the explicit variables used in the model. The model was programmed into STRIKIN-II and applied to the analysis of six PWR transients. For these transients, short-term increases in fuel centerline temperatures ranged from zero to 1650⁰K, and the predicted transient gas release varied from zero to about 4% of the pre-transient fuel pellet fission gas inventory. The results indicate that the effect of transient fission gas release on fuel rod internal pressures is not significant for conventional fuel management (batch average burnups up to about 35 MWd/kgU). (author)