Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
Page 69
Page 70
Page 71
Page 72
Page 73
Page 74
Page 75
Page 76
Page 77
Page 78
Page 79
Page 80
Page 81
Page 82
Page 83
Page 84
Page 85
Page 86
Page 87
Page 88
Page 89
Page 90
Page 91
Page 92
Page 93
Page 94
Page 95
Page 96
Page 97
Page 98
Page 99
Page 100
Page 101
Page 102
Page 103
Page 104
Page 105
Page 106
Page 107
Page 108
Page 109
Page 110
Page 111
Page 112
Page 113
Page 114
Page 115
Page 116
Page 117
Page 118
Page 119
Page 120
Page 121
Page 122
Page 123
Page 124
Page 125
Page 126
Page 127
Page 128
Page 129
Page 130
Page 131
Page 132
Page 133
Page 134
Page 135
Page 136
Page 137
Page 138
Page 139
Page 140
Page 141
Page 142
Page 143
Page 144
Page 145
Page 146
Page 147
Page 148
Page 149
Page 150
Page 151
Page 152
Nuclear Science User Facilities 96 Our understanding of nuclear fuels has improved greatly thanks to the state- of-the-art techniques used in this project. Lingfeng HeAssistant ScientistUniversity of Wisconsin-Madison Currently Nuclear Fuels Engineer at Idaho National Laboratory tion of interstitials near the grain boundaries becomes too low to form loops resulting in the formation of dislocation-denuded zones near the grain boundaries. However at 600C the dislocation-denuded zones were not found even at high-angle grain boundaries Figure 4. Future Activities Circular features having diameters of 100200 nm were found in UO2 irra- diated with Xe at high doses. However the nature of these features is still not clear and furtherTEM study is planned in 2015. Publications and Presentations 1. L.F. He M. Gupta M.A. Kirk J. Pakarinen J. GanT.R.Allen 2014 In SituTEM Observation of Dis- location Evolution in Polycrystalline UO2 JOMVol. 66 pp. 25532561. 2. L.F. He J. Pakarinen M.A. Kirk J. GanA.T. Nelson X.-M. BaiA. El-AzabT.R.Allen 2014 Micro- structure evolution in Xe-irradi- ated UO2 at room temperature Nuclear Instrument and Methods in Phys- ics Research BVol. 330 pp. 5560. 3. L.F. He B.ValderramaA.-R. Has- san J.Yu M. Gupta J. Pakarinen H.B. Henderson J. Gan M.A. KirkA.T. Nelson M.V. Manuel A. El-Azab andT.R.Allen 2015 Bubble formation and Kr dis- tribution in Kr-irradiated UO2 Journal of Nuclear MaterialsVol. 456 pp. 125132. Figure 3. a Energy dispersive x-ray EDX and b and c EELS spectra of a UO2 single crystal irradiated with 300 keV Xe at room temperature up to a dose of 1 1016 ionscm2 . d The second derivative EELS spectrum of part c.