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Fraction of grain face area occupied by bubbles versus the average projected area of the bubbles, observed in UO2 fuel with pellet average burnups between 9 and 28 MWd(kgU)−1 by White , Small  and Kashibe and Une . The solid line is a plot of equation (15), combined with nb (Āp) from equation (12), and the dashed line represents the saturated grain face condition ϕ2 = 0.48.
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