Abstract
Within the experimental programs on ramping behaviour of LWR fuel rods fission gas release data have been obtained on short rodlets with a variety of manufacturing parameters. The burnup ranged from 5 to 45 GWd/t(U), the ramp terminal powers were between 350 and 550 W/cm, the holding times at ramp terminal power varied from 1 to 200 h. The fission gas release showed a pronounced increase with increasing burnup. The initial fuel to clad gap has the largest influence on the transient fission gas release. After a spontaneous fission gas release burst the integral transient fission gas release can be described approximately by a √t dependency if the fuel temperature remains almost constant. Microcoring results show that the transient fission gas release results mainly from the fuel regions exhibiting gas swelling. Fuel microstructural examinations show a correlation between the morphology of intergranular bubbles and the amount of fission gas released.
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