Document: NRC Regulatory Guide
Document ID: 5f4d6577-6c2a-473a-9a76-4033a95dba4c
Document Type: regulatory_guide
Title: Radiation Embrittlement of Reactor Vessel Materials (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740284.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.99
CFR Part: 
CFR Title: 

Content:
6 0.05 25 31 31 0.06 28 37 37 0.07 31 43 44 0.08 34 48 51 0.09 37 53 58 0.10 41 58 65 0.11 45 62 72 0.12 49 67 79 0.13 53 71 85 0.14 57 75 91 0.15 61 80 99 0.16 65 84 104 0.17 69 88 110 0.18 73 92 115 0.19 78 97 120 0.20 82 102 125 0.21 86 107 129 0.22 91 112 134 0.23 95 117 138 0.24 100 121 143 0.25 104 126 148 0.26 109 130 151 0.27 114 134 155 0.28 119 138 160 0.29 124 142 164 0.30 129 146 167 0.31 134 151 172 0.32 139 155 175 0.33 144 160 180 0.34 149 164 184 0.35 153 168 187 0.36 158 173 191 0.37 162 177 196 0.38 166 182 200 0.39 171 185 203 0.40 175 189 207 3. REQUIREMENT FOR NEW PLANTS For beltline materials in the reactor vessel for a new plant, the content of residual elements such as copper, phosphorus, sulfur, and vanadium should be controlled to low levels.* The copper con- tent should be such that the calculated adjusted reference temperature at the 1/4T position in the vessel wall at end of life is less than 200°F. In selecting the optimum amount of nickel to be used, its deleterious effect on radiation embrittlement should be balanced against its beneficial metallurgical effects and its tendency to lower the initial RTNDT· *For more infonnation, see the Appendix to ASTM Standard Specification A 533 (Ref. 8). 1.99-5 Nickel, Wt-% 0.60 0.80 1.00 1.20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 26 26 26 26 31 31 31 31 37 37 37 37 44 44 44 44 51 51 51 51 58 58 58 58 65 67 67 67 74 77 77 77 83 86 86 86 91 96 96 96 100 105 106 106 110 115 117 117 118 123 125 125 127 132 135 135 134 14i 144 144 142 150 154 154 149 159 164 165 155 167 172 174 161 176 181 184 167 184 190 194 172 191 199 204 176 199 208 214 180 205 216 221 184 211 225 230 187 216 233 239 191 221 241 248 194 225 249 257 198 228 255 266 202 231 260 274 205 234 264 282 209 238 268 290 212 241 272 298 216 245 275 303 220 248 278 308 223 250 281 313 227 254 285 317 231 257 288 320 D. IMPLEMENTATION The purpose of this section is to provide information to applicants and licensees regarding the