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- W2094272200 abstract "Fuel centreline temperatures measured under transient conditions are reported. These show that also at burnups as high as 4.5% FIMA the onset temperature for thermal gas release is close to 1200°C. At constant linear power the 1200°C isotherm moves outwards with burnup due to the development of a thermal barrier at the pellet rim and a general degradation in the fuel thermal conductivity. This causes the observed burnup enhancement of gas release. Using radial temperature profiles constructed from experimental data, grain growth and Xe diffusion during a power transient at high burnup are reexamined. It is found that grain growth is slower than predicted for steady-state irradiation conditions. The effective Xe diffusion coefficient, DXe, in the transient tests with hold times of 40, 42 and 62 h is given by DXe = 1.9 × 10−8exp(−21890/T) cm2s−1, T in K. For the tests with a 4 h hold time, DXe is giv by DXe = 2.5 × 10−9exp(−21050/T) below 1570°C, but by the former equation above 1600°C. In the long transient tests, the increase in the DXe below 1570°C is attributed to the annealing of gas traps in the oxide lattice." @default.
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- W2094272200 date "1994-07-01" @default.
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- W2094272200 title "Temperature measurements in high burnup UO2 nuclear fuel: Implications for thermal conductivity, grain growth and gas release" @default.
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- W2094272200 doi "https://doi.org/10.1016/0022-3115(94)90276-3" @default.
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