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MOX fuel

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manufacture is not in principle a very radical step. About 30 thermal reactors in Europe (Belgium, the Netherlands, Switzerland, Germany and France) are using MOX and an additional 20 have been licensed to do so. Most reactors use it as about one third of their core, but some will accept up to 50% MOX assemblies. In France, EDF aims to have all its 900 MWe series of reactors running with at least one-third MOX. Japan aimed to have one third of its reactors using MOX by 2010, and has approved construction of a new reactor with a complete fuel loading of MOX. As 2011, of the total nuclear fuel used, MOX provides about 2%.
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Reprocessing the plutonium into usable fuel increases the energy derived from the original uranium by some 12%, and if the uranium-235 is also recycled by re-enrichment, this becomes about 20%. Currently plutonium is only reprocessed and used once as MOX fuel; spent MOX fuel, with a high proportion
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Most modern thermal reactors using high burn up uranium oxide fuel produce a quite significant proportion of their output towards the end of core life from fission of plutonium produced by neutron capture in uranium 238 earlier in the life of the core, so adding some plutonium oxide to the fuel at
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from thermal reactors is significant – greater than 50% of the initial plutonium loading. However, during the burning of MOX the ratio of fissile (odd numbered) isotopes to non-fissile (even) drops from around 65% to 20%, depending on burn up. This makes any attempt to recover the fissile isotopes
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of other actinides than thermal reactors. Because thermal reactors use slow or moderated neutrons, the actinides that are not fissionable with thermal neutrons tend to absorb the neutrons instead of fissioning. This leads to buildup of heavier actinides and lowers the number of thermal neutrons
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was designed for 100% MOX core compatibility, but so far has always operated on fresh low enriched uranium. In theory, the three Palo Verde reactors could use the MOX arising from seven conventionally fueled reactors each year and would no longer require fresh uranium fuel.
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difficult and any bulk Pu recovered would require such a high fraction of Pu in any second generation MOX that it would be impractical. This means that such a spent fuel would be difficult to reprocess for further reuse (burning) of plutonium. Regular reprocessing of
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and the cycle could be repeated; however, there remains multiple difficulties in reprocessing spent MOX fuel. As of 2010, plutonium is only recycled once in thermal reactors, and spent MOX fuel is separated from the rest of the spent fuel to be stored as waste.
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expressed interest in using MOX reactor fuel from the conversion of weapons-grade plutonium, TVA (currently the most likely customer) said in April 2011 that it would delay a decision until it could see how MOX fuel performed in the nuclear accident at
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from the plutonium by a chemical separation process. Even under the worst conditions, the americium/plutonium mixture is less radioactive than a spent-fuel dissolution liquor, so it should be relatively straightforward to recover the plutonium by
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About 30% of the plutonium originally loaded into MOX fuel is consumed by use in a thermal reactor. In theory, if one third of the core fuel load is MOX and two-thirds uranium fuel, there is zero net change in the mass of plutonium in the
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of the thorium-plutonium fuel is negative for plutonium contents up to 21%, whereas the transition lies at 16% for MOX fuel." The authors concluded, "Thorium-plutonium fuel seems to offer some advantages over MOX fuel with regards to
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run in "Actinide burner mode". This is one means of transmutation. Work with curium is much harder than americium because curium is a neutron emitter, the MOX production line would need to be shielded with both
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must be re-licensed before MOX fuel can be introduced because using it changes the operating characteristics of a reactor, and the plant must be designed or adapted slightly to take it; for example, more
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are needed. Often only a third to half of the fuel load is switched to MOX, but for more than 50% MOX loading, significant changes are necessary and a reactor needs to be designed accordingly. The
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For example, a mixture of 7% plutonium and 93% natural uranium reacts similarly, although not identically, to low-enriched uranium fuel (3 to 5% uranium-235). MOX usually consists of two phases, UO
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and reprocessing. Reprocessing of spent commercial-reactor nuclear fuel is not permitted in the United States due to nonproliferation considerations. Germany had plans for a reprocessing plant at
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Normally, with low-enriched uranium fuel being changed every five years or so, most of the plutonium-239 is "burned" in the reactor. It behaves like uranium-235, with a slightly higher
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but as this failed to materialize, it instead relied on French nuclear reprocessing capabilities until legally outlawing the transport of German spent fuel for reprocessing in 2005.
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The first step is separating the plutonium from the remaining uranium (about 96% of the spent fuel) and the fission products with other wastes (together about 3%) using the
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Plutonium from reprocessed fuel is usually fabricated into MOX within less than five years of its production to avoid problems resulting from impurities produced by the
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must be known precisely at any given point in time, including the effect of build-up or consumption of neutron emitting nuclides as well as neutron poisons.
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using electron microprobe attachment. The lighter the pixel in the right hand side the higher the plutonium content of the material at that spot
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could either be run in the fast neutron spectrum (without the need for highly enriched fuels as otherwise common in fast reactors) or use
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committee on plutonium disposition that it has extensive experience in testing the use of MOX fuel containing from 0.5 to 3% plutonium.
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plutonium, an alternative to storage of surplus plutonium, which would need to be secured against the risk of theft for use in
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could "burn" such fuels if the problems associated with their handling and transportation are solved. However, to avoid
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in The Ottawa Citizen (22 August 1994): "CANDU ... reactor design inherently allows for the handling of full-MOX cores"
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Plutonium oxide is substantially more toxic than uranium oxide, making fuel manufacture more difficult and expensive.
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MOX fuel tends to run hotter because of lower thermal conductivity, which may be an issue in some reactor designs.
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to breed fissile materials, compensating the loss of neutrons by increasing the flux from the neutron source.
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As plutonium isotopes absorb more neutrons than uranium fuels, reactor control systems may need modification.
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are designed for 100% MOX loading. In 2022, the BN-800 was fully loaded with MOX fuel for the first time.
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is therefore more efficient than a thermal reactor for using plutonium and higher actinides as fuel.
1250: 1442: 1157: 920:"Military Warheads as a Source of Nuclear Fuel - Megatons to MegaWatts - World Nuclear Association" 418:-245; in thermal reactors isotopic degradation limits the plutonium recycle potential. About 1% of 1955: 1772: 1764: 1572: 1517: 1460: 1452: 1429: 868: 854: 207: 2415: 1599: 1468: 806: 1290: 2040: 2032: 1829: 1821: 1796: 1733: 1709: 1505: 1476: 1237: 584: 195: 112: 2133: 2125: 2048: 1837: 1746: 1717: 1533: 1069:"Candu works with UK Nuclear Decommissioning Authority to study deployment of EC6 reactors" 345: 317: 147:. Most of the fuel mass in a reactor is uranium-238. By neutron capture and two successive 128: 108: 66: 962: 397:
Fission gas release in MOX fuel assemblies may limit the maximum burn-up time of MOX fuel.
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As of 2015, the only demonstration of twice-recycled, high-burnup fuel occurred in the
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Natarajan, R. (2015). "Reprocessing of spent fast reactor nuclear fuels, Natarajan".
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A used MOX, which has 63 GW days (thermal) of burnup and has been examined with a
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and plutonium oxides is also being tested. According to a Norwegian study, "the
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could be added to a U/Pu MOX fuel before it is loaded into a fast reactor or a
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may vary from 1.5 wt.% to 25–30 wt.% depending on the type of nuclear reactor.
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could use 100% MOX cores without physical modification. AECL reported to the
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is converted by treatment with a base such as ammonia to form a mixture of
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Rücknahme radioaktiver Abfälle aus der Wiederaufarbeitung (In German)
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One attraction of MOX fuel is that it is a way of utilizing surplus
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Technical Aspects of the Use of Weapons Plutonium as Reactor Fuel
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All plutonium isotopes are either fissile or fertile, although
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Also, the neutron irradiation of curium generates the higher
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MOX fuel can be made by grinding together uranium oxide (UO
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spent MOX is difficult because of the low solubility of PuO
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and plutonium hydroxide. After heating in a mixture of 5%
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for fission, and its fission releases a similar amount of
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is plutonium, with approximate isotopic composition 52%
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Björk, Klara Insulander; Fhager, Valentin (June 2009).
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Because the fission-to-capture ratio of high energy or
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Licensing and safety issues of using MOX fuel include:
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The United States was building a MOX fuel plant at the
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of commercial nuclear fuel to make MOX is performed in
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with a 14-year half-life. Because americium-241 is a
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of plutonium. In particular, plutonium-241 decays to
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Program to turn plutonium bombs into fuel hits snags
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and converted into pellets. The pellets can then be
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London: Imperial College Press. p. 58. 1257: 673:, the resulting powder can be run through a 588:available to continue the chain reaction. A 218:and plutonium isotopes, is stored as waste. 1331:Burning Weapons Plutonium in CANDU Reactors 1288: 1194: 1655: 1641: 1370: 1356: 1010:. International Panel on Fissile Materials 267:United States National Academy of Sciences 1123: 1284: 1282: 1027: 1025: 809:worths, CVR and plutonium consumption." 718:or another aqueous reprocessing method. 681:into mixed uranium and plutonium oxide. 304: 179:, like uranium-235. Small quantities of 167:, and (after further beta decays) other 1377: 1181: 1102: 608: 300: 191:are formed similarly from uranium-235. 14: 2408: 1005: 202:. Typically, about one percent of the 1662: 1636: 1351: 1279: 1022: 705:emitter, its presence is a potential 236:Palo Verde Nuclear Generating Station 1182:Gardner, Timothy (12 October 2018). 684: 279:un-burnt plutonium in spent MOX fuel 234:reactor design deployed at the U.S. 65:. MOX fuel is an alternative to the 774:due to unintended criticality, the 375: 24: 1267:. World Nuclear News. 21 June 2013 1134:10.1016/B978-1-78242-212-9.00009-5 981:"Factsheets on West Valley · NIRS" 636: 25: 2442: 1309: 1216:Nuclear Decommissioning Authority 721: 272: 1326:Nuclear Issues Briefing Paper 42 1158:TVA might use MOX fuels from SRS 899:Spent nuclear fuel shipping cask 847: 833: 819: 534: 359:in South Carolina. Although the 1175: 1163: 1151: 1140: 1117: 1006:Podvig, Pavel (10 March 2011). 259:Atomic Energy of Canada Limited 1083: 1061: 1050: 999: 983:. 1 March 2015. Archived from 973: 955: 941: 912: 781: 603: 13: 1: 1218:. August 2008. Archived from 905: 620: 206:discharged from a reactor is 340:operated from 1994 to 2018. 311:scanning electron microscope 135:of uranium isotopes such as 41:that contains more than one 7: 1918:Organouranium(IV) compounds 812: 122: 10: 2447: 785: 629:) and plutonium oxide (PuO 538: 361:Tennessee Valley Authority 324:and to a lesser extent in 33:, commonly referred to as 2381: 2082: 2025: 2002: 1979: 1795: 1694: 1670: 1611: 1592: 1565: 1493: 1422: 1385: 827:Nuclear technology portal 768:Accelerator Driven System 762:dose associated with the 726:It is possible that both 645:and plutonium nitrate in 747:to protect the workers. 49:, usually consisting of 1209:"NDA Plutonium Options" 869:Nuclear breeder reactor 855:Renewable energy portal 798:coolant void reactivity 661:will form a mixture of 127:In every uranium-based 1245:Cite journal requires 553:for almost all of the 314: 151:, uranium-238 becomes 1265:"Thorium test begins" 924:www.world-nuclear.org 758:, which increase the 346:fast breeder reactors 308: 113:nuclear proliferation 2421:Nuclear reprocessing 792:MOX fuel containing 609:Plutonium separation 301:Current applications 129:nuclear reactor core 109:nuclear reprocessing 92:. 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2417: 2416:Nuclear fuels 2414: 2413: 2411: 2396: 2394: 2387: 2386: 2384: 2380: 2374: 2356: 2354: 2344: 2342: 2336: 2334: 2320: 2318: 2304: 2302: 2288: 2286: 2276: 2274: 2260: 2258: 2248: 2246: 2236: 2234: 2212: 2210: 2200: 2198: 2184: 2182: 2168: 2166: 2160: 2158: 2152: 2150: 2140: 2138: 2132: 2130: 2124: 2122: 2108: 2106: 2088: 2087: 2085: 2081: 2075: 2065: 2063: 2062: 2055: 2053: 2047: 2045: 2039: 2037: 2031: 2030: 2028: 2024: 2018: 2008: 2007: 2005: 2001: 1995: 1985: 1984: 1982: 1978: 1969: 1954: 1952: 1938: 1936: 1922: 1920: 1916: 1910: 1900: 1898: 1892: 1890: 1884: 1882: 1876: 1874: 1868: 1866: 1860: 1858: 1852: 1850: 1844: 1842: 1836: 1834: 1828: 1826: 1820: 1818: 1815: 1813: 1803: 1802: 1800: 1798: 1794: 1785: 1771: 1769: 1766: 1765:Organouranium 1762: 1756: 1753: 1751: 1745: 1743: 1737: 1735: 1732: 1730: 1724: 1722: 1716: 1714: 1708: 1706: 1700: 1699: 1697: 1693: 1687: 1684: 1682: 1676: 1675: 1673: 1669: 1665: 1658: 1653: 1651: 1646: 1644: 1639: 1638: 1635: 1623: 1617: 1616: 1614: 1610: 1604: 1598: 1597: 1595: 1593:Plutonium(VI) 1591: 1585: 1579: 1577: 1571: 1570: 1568: 1564: 1558: 1544: 1542: 1532: 1530: 1524: 1522: 1516: 1514: 1504: 1502: 1499: 1498: 1496: 1494:Plutonium(IV) 1492: 1486: 1483: 1481: 1475: 1473: 1467: 1465: 1459: 1457: 1451: 1449: 1446: 1444: 1441: 1439: 1433: 1431: 1428: 1427: 1425: 1421: 1415: 1412: 1410: 1407: 1405: 1399: 1397: 1391: 1390: 1388: 1386:Plutonium(II) 1384: 1380: 1373: 1368: 1366: 1361: 1359: 1354: 1353: 1350: 1344: 1340: 1337: 1334: 1332: 1329: 1327: 1324: 1322: 1319: 1317: 1314: 1313: 1293:. p. 487 1292: 1285: 1283: 1266: 1260: 1252: 1239: 1225:on 2011-05-25 1221: 1217: 1210: 1204: 1202: 1200: 1198: 1189: 1185: 1178: 1171: 1166: 1159: 1154: 1148: 1143: 1135: 1131: 1127: 1120: 1112: 1105: 1098: 1094: 1091: 1086: 1070: 1064: 1058: 1053: 1039:on 2013-03-01 1038: 1034: 1028: 1026: 1009: 1002: 986: 982: 976: 968: 964: 958: 950: 944: 930:on 2013-02-24 929: 925: 921: 915: 911: 900: 897: 895: 892: 890: 887: 885: 884:Nuclear power 882: 880: 877: 875: 872: 870: 867: 865: 862: 861: 856: 850: 845: 842: 841:Energy portal 836: 831: 828: 817: 810: 808: 804: 799: 795: 789: 779: 777: 773: 769: 765: 761: 757: 753: 748: 746: 742: 737: 733: 729: 719: 717: 712: 708: 704: 700: 699:americium-241 696: 692: 682: 680: 676: 672: 668: 664: 660: 656: 652: 648: 644: 641:A mixture of 634: 618: 616: 601: 599: 595: 591: 586: 585:transmutation 581: 579: 556: 552: 548: 547:fast neutrons 542: 535:Fast reactors 532: 529: 508: 487: 466: 445: 425: 422:from current 421: 417: 413: 412:plutonium-242 408: 405: 396: 393: 390: 387: 386: 385: 382: 373: 371: 366: 362: 358: 353: 351: 347: 343: 339: 335: 331: 327: 323: 319: 312: 307: 298: 296: 291: 285: 280: 270: 268: 264: 260: 257:According to 255: 253: 249: 246:Fast neutron 244: 241: 237: 233: 229: 224: 219: 217: 211: 209: 205: 201: 197: 196:cross section 192: 190: 189:plutonium-238 186: 185:neptunium-237 182: 178: 174: 170: 166: 165:plutonium-242 162: 161:plutonium-241 158: 157:plutonium-240 154: 153:plutonium-239 150: 146: 142: 138: 134: 130: 120: 118: 114: 110: 106: 102: 101:weapons-grade 97: 78: 76: 75:nuclear power 72: 68: 64: 60: 56: 53:blended with 52: 48: 44: 40: 36: 32: 19: 2388: 2056: 1566:Plutonium(V) 1295:. Retrieved 1269:. Retrieved 1259: 1238:cite journal 1227:. Retrieved 1220:the original 1187: 1177: 1165: 1153: 1142: 1125: 1119: 1110: 1104: 1085: 1073:. Retrieved 1063: 1052: 1041:. Retrieved 1037:the original 1012:. Retrieved 1001: 989:. Retrieved 985:the original 975: 966: 957: 943: 932:. Retrieved 928:the original 923: 914: 864:Hanford Site 791: 749: 725: 688: 640: 624: 612: 582: 578:fast reactor 557:, including 544: 409: 400: 383: 379: 354: 336:. In the UK 318:Reprocessing 316: 292: 276: 256: 245: 228:control rods 220: 212: 193: 126: 98: 79: 77:generation. 39:nuclear fuel 34: 30: 29: 1128:: 213–243. 1014:13 February 991:6 September 803:control rod 782:Thorium MOX 756:californium 647:nitric acid 604:Fabrication 365:Duke Energy 350:Wackersdorf 181:uranium-236 169:transuranic 149:beta decays 145:uranium-238 137:uranium-235 2410:Categories 1297:11 October 1229:2008-09-07 1075:5 December 1043:2011-05-22 934:2008-09-06 906:References 894:Remix Fuel 786:See also: 776:neutronics 754:, such as 669:. Using a 621:Dry mixing 539:See also: 404:spent fuel 363:(TVA) and 204:spent fuel 752:actinides 728:americium 711:americium 703:gamma ray 617:process. 555:actinides 232:System 80 221:Existing 208:plutonium 51:plutonium 2003:U(IV,VI) 1339:Archived 1093:Archived 813:See also 695:isotopes 679:sintered 657:and 95% 655:hydrogen 284:biphasic 261:(AECL), 173:actinide 123:Overview 35:MOX fuel 1980:U(IV,V) 1271:21 July 1188:Reuters 794:thorium 760:neutron 551:fission 510:and 2% 177:fissile 133:fission 84:and PuO 2382:U(XII) 1695:U(III) 732:curium 468:, 15% 447:, 24% 416:curium 326:Russia 322:France 295:Phénix 248:BN-600 200:energy 2222:·2(NH 2083:U(VI) 1797:U(IV) 1739:U(OH) 1671:U(II) 1581:XePuF 1534:Pu(IO 1506:Pu(NO 1223:(PDF) 1212:(PDF) 807:boron 745:water 716:PUREX 691:decay 675:press 659:argon 615:PUREX 489:, 6% 342:China 338:THORP 334:Japan 330:India 238:near 61:, or 43:oxide 37:, is 2330:COO) 2322:ZnUO 2298:(OH) 2282:(OH) 2190:(CHO 2178:COO) 2142:U(PO 2026:U(V) 1902:U(SO 1805:U(BH 1546:Pu(C 1469:PuBr 1461:PuCl 1430:PuAs 1414:PuSi 1409:PuSe 1299:2017 1273:2013 1251:help 1077:2013 1016:2012 993:2008 805:and 743:and 741:lead 730:and 671:base 665:and 424:LWRs 332:and 250:and 187:and 2366:(CO 2326:(CH 2310:(SO 2290:(UO 2266:(NO 2174:(CH 2126:UCl 2090:(NH 2049:UBr 2033:UCl 1956:U(C 1940:U(C 1924:U(C 1894:UTe 1886:USe 1870:USi 1838:UBr 1822:UCl 1773:U(C 1718:UBr 1710:UCl 1619:PuO 1600:PuF 1573:PuF 1526:PuO 1518:PuF 1501:PuC 1485:PuN 1477:PuI 1453:PuF 1448:PuB 1443:PuP 1435:PuH 1401:PuB 1393:PuH 1130:doi 214:of 171:or 45:of 18:MOX 2412:: 2390:UO 2362:UO 2358:Na 2350:UO 2338:UN 2306:UO 2278:UO 2262:UO 2250:UO 2242:Cl 2238:UO 2230:CO 2218:CO 2214:UO 2206:CO 2202:UO 2186:UO 2170:UO 2162:UO 2154:UO 2134:UF 2110:Na 2058:UI 2041:UF 1968:Cl 1878:US 1862:UH 1854:UO 1846:UI 1830:UF 1817:UC 1755:UN 1747:UH 1734:UP 1726:UI 1702:UF 1686:US 1678:UB 1281:^ 1242:: 1240:}} 1236:{{ 1214:. 1196:^ 1186:. 1024:^ 965:. 922:. 563:92 521:Pu 517:94 500:Pu 496:94 479:Pu 475:94 458:Pu 454:94 437:Pu 433:94 328:, 183:, 163:, 159:, 119:. 57:, 2392:6 2372:3 2370:) 2368:3 2364:2 2360:4 2352:4 2348:2 2346:H 2340:2 2332:4 2328:3 2324:2 2316:2 2314:) 2312:4 2308:2 2300:4 2296:2 2294:) 2292:2 2284:2 2280:2 2272:2 2270:) 2268:3 2264:2 2256:2 2254:F 2252:2 2244:2 2240:2 2232:3 2228:2 2226:) 2224:4 2220:3 2216:2 2208:3 2204:2 2196:2 2194:) 2192:2 2188:2 2180:2 2176:3 2172:2 2164:4 2156:3 2148:2 2146:) 2144:4 2136:6 2128:6 2120:7 2118:O 2116:2 2114:U 2112:2 2104:7 2102:O 2100:2 2098:U 2096:2 2094:) 2092:4 2073:5 2071:O 2069:2 2067:U 2060:5 2051:5 2043:5 2035:5 2016:8 2014:O 2012:3 2010:U 1993:3 1991:N 1989:2 1987:U 1966:3 1964:) 1962:5 1960:H 1958:5 1950:4 1948:) 1946:5 1944:H 1942:5 1934:2 1932:) 1930:8 1928:H 1926:8 1908:2 1906:) 1904:4 1896:2 1888:2 1880:2 1872:2 1864:4 1856:2 1848:4 1840:4 1832:4 1824:4 1811:4 1809:) 1807:4 1783:3 1781:) 1779:5 1777:H 1775:5 1749:3 1741:3 1728:3 1720:3 1712:3 1704:3 1680:2 1656:e 1649:t 1642:v 1621:4 1602:6 1583:6 1575:5 1556:2 1554:) 1552:8 1550:H 1548:8 1540:4 1538:) 1536:3 1528:2 1520:4 1512:4 1510:) 1508:3 1479:3 1471:3 1463:3 1455:3 1437:3 1403:2 1395:2 1371:e 1364:t 1357:v 1301:. 1275:. 1253:) 1249:( 1232:. 1190:. 1136:. 1132:: 1079:. 1046:. 1018:. 995:. 969:. 937:. 631:2 627:2 567:U 288:2 94:2 90:2 86:2 82:2 20:)

Index

MOX
nuclear fuel
oxide
fissile material
plutonium
natural uranium
reprocessed uranium
depleted uranium
low-enriched uranium
light-water reactors
nuclear power
weapons-grade
nuclear weapons
nuclear reprocessing
nuclear proliferation
nuclear fuel cycle
nuclear reactor core
fission
uranium-235
neutron capture
uranium-238
beta decays
plutonium-239
plutonium-240
plutonium-241
plutonium-242
transuranic
actinide
fissile
uranium-236

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