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23 Electron Microscopy Laboratory U-7Mo fuel irradiated in ATR as part of the RERTR-7A experiment to the fission density of 5.21021cm3. a Secondary electron micro- graph of the frontal view of the sample acquired near the end of the cross-sectioning process b 3D reconstruction highlighting with dif- ferent colors the regions where different pores may have begun to interconnect and c 3D reconstruction of the cube highlighting the pores shown in yellow on the outer surfaces D. Keiser B. Miller J.-F. Jue J. Gan A. Robinson P. Medvedev J. Madden M. Teague D. Wachs Proc. Research Reactor Fuel Management Conference March 30-April 3 2014 in Ljubljana Slovenia. Scanning electron micrographs of the fracture surface observed in X-750 springs and cross-sectional view of the lamella before lift-out.