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Number density of grain face bubbles versus the average projected area of the bubbles, observed in UO2 fuel with pellet average burnups between 9 and 33 MWd(kgU)−1 by White , Walker et al.  and Kashibe and Une . The solid line is a plot of equation (12) over its range of application in the model. The dashed line represents the saturated grain face condition ϕ2 = nb Āp = 0.48.
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