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JOG thickness predicted by ANGE and OC. In (a), a uniform molar volume corresponding to that of Cs2 MoO4 at room temperature has been assumed for all fission products. In (b) and (c) the gap composition has been evaluated thermodynamically at 800 K (b), and 1000 K (c). In Tourasse (red dots) , the burnup values refer to the local burnup at which the JOG was measured. In Melis (black dots) , the burnup refers to the maximum burnup reached in the fuel pin.