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 Page 153 Page 154 Page 155 Page 156 Page 157 Page 158 Page 159 Page 160 Page 161 Page 162 Page 163 Page 164 Page 165 Page 166 Page 167 Page 168 Page 169 Page 170 Page 171 Page 172 Page 173 Page 174 Page 175 Page 176 Page 177 Page 178 Page 179 Page 180 Page 181 Page 182 Page 183 Page 184 Page 185 Page 186 Page 187 Page 188 Page 189 Page 190 Page 191 Page 192 Page 193 Page 194 Page 195 Page 196 Page 197 Page 198 Page 199 Page 200 Page 201 Page 202 Page 203 Page 204 Page 205 Page 206 Page 207 Page 208 Page 209 Page 210 Page 211 Page 212 Page 213 Page 214 Page 215 Page 216 Page 217 Page 218 Page 219 Page 220 Page 221 Page 222 Page 223 Page 224 Page 225 Page 226 Page 227 Page 228 Page 229 Page 230 Page 231 Page 232 Page 233 Page 234 Page 235 Page 236 Page 237 Page 238 Page 239 Page 240 Page 241 Page 2422016 | AFC ACCOMPLISHMENTS 191 Eu-154, Mn-54, Ce-144, Ru-106, and Sb-125. The distributions of different fission products can be used to infer some information about the stability of different fission products in the fuel matrix and may have some impact on other fuel performance properties such as FCCI. The fission gas release from the fuel pins was measured and was found within expectations from historic fission gas release. In these transmutation fuels He release from the decay of Am is also important and was measured as well. This measure of He release (62% for the low-fertile metallic pin and 64% for the non-fertile metallic pin) in the metallic transmutation fuel containing Am is quite unique. The microstructure of the fuel pins was evaluated by optical microscopy. The cross section from the low- fertile DOE1 MNT-20Y (U-28.3Pu- 3.8Am-2.1Np-31.7Zr) pin is shown in Figure 1 and in greater detail in Figure 2. The local porosity in Figure 1 is evenly distributed locally and is spherical in shape throughout most of the fuel, but the very outer periphery of the fuel the porosity is smaller and somewhat lenticular. This would tend to indicate that the underlying crystal structure of the fuel material is cubic everywhere except the outer 500µm. In a binary or ternary metal fuel lenticular pores are formed in fuel at tempera- tures below the γ phase transition temperature (776°C). The cladding temperature of DOE1 was predicted to be approximately 550°C, so there should be a region of the fuel showing non-spherical porosity that was irradiated below the γ-U phase transition temperature. There is also a small (~20µm) interaction layer at many locations between the fuel and the cladding. Optically this cannot be positively identified. This may be the initiation of a FCCI layer, or it may be an artifact of fabrication. There was a Zr rich layer at the edge of the as-fabricated samples. The cross section from non-fertile DOE2 MNT-21Y (Pu-10.5Am- 0.3Np-41.6Zr) pin is shown in increasing detail in Figure 3, and Figure 4. The cladding has several spots with debris and tarnishing from polishing. The black marks on the cladding in Figure 3 should not be mistaken for cladding degrada- tion. This cross section shows evidence of constituent redistribu- tion and phase separation. There are several rings of microstructure present in Figure 3 that suggest different phases that were present during irradiation and these phases are likely driven by different thermal conditions present in the fuel during irradiation. The Pu-Am-Zr system is not as well understood as the U-Zr