FRAS3 analysis of transient fission-gas behavior in PNL-10 fuel

The purpose of this work is to demonstrate the capability of the updated FRAS3 code to accurately predict the detailed transient behavior of fission gas in irradiated oxide fuel. The FRAS3 code has been modified in several ways since an earlier evaluation was performed. The most significant modification, in terms of the calculated results, is in the inclusion of the vacancy-depletion effect in the analysis of the growth rate of overpressured intragranular fission-gas bubbles. The code has been applied to analysis of a series of FGR capsule-heating tests of irradiated PNL-10 fuel. This same series of tests was treated in the earlier evaluation exercise, providing a direct comparison between the observations, the original calculated results, and the latest results