Modeling of the Gadolinium Fuel Tests with the Jasmine Fuel Performance Code

JASMINE is an advanced fuel rod performance code under development by China General Nuclear Power Cooperation (CGNPC). Basing on JASMINE1.0, JASMINE2.0 incorporates some state-of-the-art models or model features developed for UO2 and (U, Gd)O2 fuel pellets and CZ2 cladding, which is the zirconium alloy used in fuel rod researched by CGNPC. And it is used to accurately predict UO2 and (U, Gd)O2 fuel behavior with special emphasis for PWR reactors. Behaviors of (U, Gd)O2 fuel during irradiation has been modeled in JASMINE2.0. These models consider the gadolinium effects on the power and burnup profiles, fission gas release (FGR), and other thermal-mechanical performances. Two Halden programme fuel rods and four GAIN programme fuel rods were used for the validation of JASMINE2.0. The comparison of online fuel central temperatures indicates that JASMINE2.0 has a conservative tendency in (U, Gd)O2 fuel with the measured data. The validation results show that JASMINE2.0 has a good and a little conservative agreement with the measured FGR, rod internal pressure and free void volume.