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KMID : 0371819970290030201
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Nuclear Engineering and Technology
1997 Volume.29 No. 3 p.201 ~ p.210
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Modelling of Thermal Conductivity for High Burnup UO₂ Fuel Retaining Rim Region
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Lee, Byung-Ho
Koo, Yang-Hyun/Sohn, Dong-Seong
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Abstract
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A thermal conductivity correlation has been proposed which can be applied to high bumup fuel by considering both of thermal conductivity with bumup across fuel pellet and additional degradation at pellet rim due to very high porosity. In addition, a correlation has been developed that can estimate the porosity of rim region as a function of rim bumup under the assumptions that all the produced fission gases are retained in the rim porosity and threshold pellet average bumup required for the formation of rim region is 40 MWD/kgU. Rim width is correlated to rim bumup using measured data.
For the RISO experimental data obtained at pellet average bumup of 43.5 MWD/kgU for three linear heat generation rates of 30, 35 and 40 kW/m, radial temperature distributions were calculated using the present correlation and compared with the measured ones. This comparison shows that the present correlation gives the best agreement with the measured data when it is combined with the HALDEN´s correlation for thermal conductivity considering its degradation with bumup. Another comparison with the HALDEN´s measured fuel centerline temperature as a function of burnup at 25 kW/m up to about 44 MWDA4J also suggests that the present correlation yields the best agreement when it is combined with the HALDEN´s thermal conductivity.
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KEYWORD
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