Internal Gas Pressure Behavior in Mixed-Oxide Fuel Rods Fuels During Irradiation
- 1 August 1970
- journal article
- research article
- Published by Taylor & Francis in Nuclear Applications and Technology
- Vol. 9 (2) , 233-241
- https://doi.org/10.13182/nt70-a28812
Abstract
Plenum gas temperature and internal gas pressure buildup were measured during irradiation in four vibrationally compacted UO2-2 wt% PuO2 fuel rods. Two each of the four instrumented fuel rods operated to peak burnups of 9900 and 6000 MWd/ MTM, respectively.Experimental results indicate that sorbed gases and moisture released from the fuel react rapidly with the Zircaloy cladding and do not contribute to the internal pressure. The predominant modes of fission gas release from high and lower power fuel rods is different.The rates of pressure buildup in the high and low burnup fuel rods, which correspond to about 34 and 12% fission gas release, respectively, were consistent with fuel temperature-dependent fission gas release fractions predicted from postirradiation gas collection data obtained from similar fuel rods.Measured plenum gas temperatures during irradiation varied directly with coolant outlet temperature.Keywords
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