imagination_APR1400

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16 Beyond your imagination_ APR1400 CHAPTER_2 DESIGN 2. Reactor Vessel and Internals The reactor vessel consists of a vertically mounted cylindrical vessel welded with a hemispherical lower head and a removable hemispherical upper closure head. The internal surfaces that are in contact with the RCS coolant are clad with austenitic stainless steel to prevent corrosion. The reactor vessel is manufactured with three shell sections, a vessel flange, and a hemispherical bottom head. The three shell sections, bottom head forging and vessel flange forging are welded together, along with four inlet nozzle forgings, two outlet nozzle forgings, four Direct Vessel Injection (DVI) nozzle forgings, and sixty-one In-Core Instrument (ICI) nozzles. The upper closure head is fabricated separately and is bolted to the reactor vessel. The dome and flange are welded together to form the upper closure head, on which the Control Element Drive Mechanism (CEDM) nozzles are welded. The RTNDT of the reactor vessel is lowered from 10 of the conventional reactor vessel to -10 with using low carbon steel, which has lower contents of Cu, Ni, P, S than those of the conventional reactor. This material improvement extends the lifetime of reactor vessel to 60 years. In addition, the Cobalt (Co) content in the reactor vessel material is lowered to reduce the occupational exposure dose. The reactor vessel internals of the conventional plant are fabricated into three parts of upper guide structure, core support barrel, and lower support structure. This compares with the reactor vessel internals of the APR1400, which are manufactured into two parts by integrating the core support barrel and lower support structure. This improvement contributes to the shortening of the construction schedule. Reactor Vessel Major Design Characteristics Extended lifetime of the vessel beyond 60 years by reducing the RTNDT to -10 with using low carbon steel as the base metal of the vessel. Reduced occupational exposure dose by decreasing the content of Co in the base metal of the vessel Shortened construction schedule by the integrated manufacture of core support barrel and lower support structure
Beyond your imagination_ APR1400 17 3. Reactor Core The reactor core generates heat with a controlled nuclear reaction and transfers the heat generated to the reactor coolant. It consists of 241 fuel assemblies, 93 Control Element Assemblies (CEAs), and 61 In-Core Instrument (ICI) assemblies. The core is designed for the refueling cycle to be greater than 18 months with a maximum discharge rod burn-up of 60,000 MWD/MTU and for the thermal margin to be increased by more than 10 %. This core design leads to the improvement of the economical efficiency and safety by increasing the plant availability factor with a longer refueling cycle and the reduction of unplanned reactor trips. A B C D E F G H J K L M N P R S T 180 90 N Full Core Box Nmber 1 2 3 4 5 6 7 XXXX Fuel Batch ID C0 B0 C0 B0 C0 B0 C0 8 9 10 11 12 13 14 15 16 17 18 C0 B0 C1 A0 B2 C2 B2 A0 C1 B0 C0 19 20 21 22 23 24 25 26 27 28 29 30 31 C0 C3 B1 A0 C2 A0 B2 A0 C2 A0 B1 C3 C0 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 C0 C3 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 C3 C0 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 B0 B1 A0 B2 A0 B2 A0 B2 A0 C1 A0 C2 A0 B1 B0 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 C0 C1 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 C1 C0 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 B0 A0 C2 A0 C1 A0 C2 A0 C2 A0 C2 A0 C1 A0 C2 A0 B0 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 C0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 C0 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 B0 C2 B2 A0 B1 A0 C2 A0 A0 A0 C2 A0 B1 A0 B2 C2 B0 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 C0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 C0 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 B0A0 C2 A0 C1 A0 C2 A0 C2 A0 C2 A0 C1 A0 C2 A0 B0 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 C0C1 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 C1 C0 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 B0 B1 A0 C2 A0 C1 A0 B1 A0 C1 A0 C2 A0 B1 B0 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 C0 C3 B2 A0 B2 A0 B2 A0 B2 A0 B2 A0 B2 C3 C0 211 212 213 214 215 216 217 218 219 220 221 222 223 C0 C3 B1 A0 C2 A0 B2 A0 C2 A0 B1 C3 C0 224 225 226 227 228 229 230 231 232 233 234 C0 B0 C1 A0 B2 C2 B2 A0 C1 B0 C0 235 236 237 238 239 240 241 C0 B0 C0 B0 C0 B0 C0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 0 Core Loading Pattern Major Design Characteristics Improved economical efficiency with a longer refueling cycle greater than 18 months Increased thermal margin by more than 10 % to reduce unplanned reactor trips
Page 1 and 2: www.kepco.co.kr Beyond your imagina
Page 3 and 4: Clearer than your Anticipation CHAP
Page 5 and 6: APR1400 Design Features General Pla
Page 7 and 8: KEPCO and APR 1400 chosen by the UA
Page 9 and 10: History of Korean Nuclear Technolog
Page 11 and 12: Beyond your imagination_ APR1400 07
Page 13 and 14: Building and Structure Primary Syst
Page 19: Beyond your imagination_ APR1400 15
Page 29 and 30: APR1400 Advanced Power Reactor 1400
Page 39 and 40: Safety Goal and Design Philosophy S
Page 49 and 50: Safety Injection Performance Test f
Page 55 and 56: Vitrification of Low and Intermedia
Page 59 and 60: Reactor Containment Building Work M
Page 67 and 68: Improvement for In-Service Inspecti
Page 71 and 72:
Beyond your imagination_ APR1400 67
Page 73 and 74:
CORE DESIGN, FUEL DESIGN & FABRICAT
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