Thorium based fuel options for the generation of electricity. The customary approach to reactor development assumes that a reactor is primarily a mechanical engineering devicethat the ultimate goal of economically competitive nuclear power will be achieved by simplifying the mechanical design and by making the fuel elements more reliable. Thorium reactors are based on the thorium fuel cycle and use thorium 232 as a fertile material. This report covers the progress made in the study up to august 1967, at which time the two. Cooled reactor htgr in a pebble bed and a prismatic moderator and fuel configurations. The wall of shame this section shows a few examples of articles that propagate the misinformation represented by the myths. Fluid fuel reactors, 979 pages, addisonwesley, 1958. A two fluid design uses a fuel salt that carries the fissile 233uf4. Thorium fluoride thf 4 salt is the fertile fuel input thf msr, or lftr exceedingly stable salt, of no weapons value. A liquidfluoride reactor, the aircraft reactor experiment, was operated at oak ridge national laboratory in 1954 as part of the anp program. This comprehensive discussion of fluid fuel reactors summarizes results of research that has been carried on in the united states for almost ten years. The mosel reactor concept no ocr, 300 dpi image, 10. Fluid fuel reactors are a prerequisite to efficiently and economically breeding thorium in thermalspectrum reactors.
Molten salt reactors and thorium energy 1st edition. Analysis of candu reactor performance using thorium fuel. With salt distillation, an msfr can burn plutonium, or even fluorinated nuclear waste from light water reactors. Today, the value of this approach has finally been recognized by venture capitalists such as peter thiel, philanthropists such as bill gates, and policy makers in washington who have recently. In particular, the inventory of tho 2 233uo 2 fuel developed for the 1978 light water breeder reactor contains. Instead of thorium, a molten salt reactor can use uranium235 or plutonium waste, from lwr and other reactors. Fluid fuel reactors approaches to the subject of nuclear power from a chemical standpoint, rather than from the point of view of mechanical engineering. Thorium fuel cycle potential benefits and challenges. To learn more about thorium, we feature a page about thorium as nuclear fuel, as well as a big page about the fluid fueled molten salt reactors msrs that are good at using it.
Molten salt reactors is a comprehensive reference on the status of molten salt reactor msr research and thorium fuel utilization. A two fluid reactor that has thorium in the fuel salt is sometimes called a one and a half fluid reactor, or 1. The reactor to be used is the ap built by westinghouse, a 1154 mwe. Us2067644a1 thoriumbased nuclear reactor and method. Reactor based on the thorium uranium233 fuel cycle reinhard koch and andrey myasnikov1 1. Natural thorium is relatively abundant in many parts of the world, including those lacking uranium resources.
Jan 01, 2017 the basic idea of the dual fluid principle is a liquidfueled fast reactor with separation of the coolant from the fuel loop see fig. Myths and misconceptions about thorium nuclear fuel. Msfr and other gen iv concepts sodium cooled fast reactors, ads systems. The general atomics ga company built two thorium reactors over the 19601970 period. This task force ultimately resulted in the down selection to the msr as. Aug 24, 2015 when that happens, a thorium reactor appears to have advantages, from the availability of the fuel to the safety of the reactor. Spent fuel contains fission products, fi ilfissile flfuel, and filfertile uranium. I 351 kg of 233u i 14,000 kg of thorium this fuel could be. The kindle edition of fluid fuel reactors exists because id heard so much about it, but struggled personally when reading the scanned pdf copies circulating online. Molten salt reactors, including liquid fluoride thorium reactor. Liquid fluoride thorium reactor or lftr is a specific fission energy. The road to enablement for a liquidfuel reactor fuelled by thorium. Advantages of liquid fluoride thorium reactor in comparison with light water.
Pdf development of pyroprocessing technology for thorium. The reactor has a number of passive safety features and a fuel cycle that has reduced environmental impact bhabba atomic research centre. Totally consumed, with no refuelling shutdowns needed, no excess fuel in core. In a future liquidfluoride thorium reactor, the fuel cycle would be quite different. Thorium in light water reactors, the renaissance thorium, rather than uranium, as a fuel for power reactors was genuinely considered in the u. Use of thorium in the generation iv molten salt reactors and.
Fluid fueled reactors ffrs documents aka molten salt. Introduction of thorium in the nuclear fuel cycle international. Salts of longlived transuranic metals go back into the reactor as fuel. This is a hybrid, with some of the advantages and disadvantages of both 1 fluid and 2 fluid reactors. Basic approach to the development of reprocessing technology devoted to the molten salt reactor msr systems is significantly influenced by the fact that msr is the nonclassical nuclear reactor type with liquid molten salt fuel. A thorium fuel cycle needs uranium or plutonium to initiate a fission reaction. The thorium uranium fuel cycle converts fertile thorium 232 into fissile. The plutonium isotopes are pu238, pu239, pu240, pu241, pu242 with their ratios. High efficiency nuclear power plants using liquid fluoride. This book continues to inspire leading researchers and engineers to this day.
The major goal of the msrp was to achieve a thorium reactor that could produce power at low cost while simultaneously conserving and extending the nations fuel resources. Twofluid moltensalt breeder reactor design study status as. Abundant thorium as an alternative nuclear fuel mit. Configuration of a molten chloride fast reactor on a thorium fuel cycle to current nuclear fuel cycle concerns. There are serious safety issues associated with the retention of fission products in the fuel, and it is not. The reactor may comprise a pressure vessel for housing a nuclear reactor core, the vessel having a lower vessel with an upwardly facing opening and a vessel closure head having a sealable access port.
It fed power to germanys grid for 432 days in the late 1980s, before it. This was the first time a new nuclear reactor has been commissioned since 1978. The liquid fluoride thorium reactor lftr consists of a critical core orange. Yet most of the worlds commercial civilian reactors more than 400 have just one basic design. There is growing awareness that nuclear energy is needed to complement intermittent energy sources and to avoid pollution from fossil fuels. The dual fluid reactor a concept beyond generation iv 4 fission products med. Liquid fuel molten salt reactors for thorium utilization.
Initially, a 10 mw pilot and a larger demonstrator of the liquid fuel tmsrlf. Liquid fluoride thorium reactor or lftr is a specific fission energy technology based on thorium rather than uranium as the energy source. Introduction the molten salt reactor msr is suitable for the removal of actinides, accumulated in light water reactors, of dismantled nuclear weapons, and for the efficient and economical energy production. The lftr is a liquidfueled, graphitemoderated, thermal spectrum breeder reactor optimized for operation on a thorium supported uranium233 th233u fuel cycle. The first was a 40 mwe prototype at peach bottom, pennsylvania operated by philadelphia electric. India plans to meet 30% of its total power requirements in 2050 by using thorium fueled reactors. Molten salt reactors, including liquid fluoride thorium reactors. While the industrial market continued to support uranium based lwrs, some thorium based technologies showed promise as a potential competitor. In february 2012, the nuclear regulatory commission nrc approved a license for two new nuclear reactors in georgia.
Fluid fuel reactors approaches to the subject of nuclear power from a chemical. The fuel is dissolved in a fluoride salt coolant constituted by a mixture of fluorides lif. Alternative cooling systems for the thorium fuel cycle molten. Mar 14, 2019 some people believe that liquid fluoride thorium reactors, which would use a hightemperature liquid fuel made of molten salt, would be significantly safer than currentgeneration reactors. Thorium, an unused but strategic resource can be used as a liquid type nuclear fuel in a molten salt reactor. All thorium is consumed no spent fuel 90% of bwrpwr uranium is unused. A molten salt reactor msr is a class of nuclear fission reactor in which the primary nuclear. The liquid fluoride thorium reactor lftr is a thermal breeder. Theoretically, a two fluid reactor design could separate the fertile thorium from the fissile fuel salts. Can be highlighted some reactor concepts using thorium as fuel. The rare promise of thorium reactors white house chronicle.
This project is based on a fluid fuel, similar to that of the molten salt reactor, but in. The nuclear chain reaction takes place in an arrangement of tubes through which the liquid fuel cycles and which is set within a stream of pure molten lead not an eutectic, the cooling liquid. Compared to our supply of coal, oil, and natural gas, the earths. Alvin weinbergs liquid fuel reactors atomic insights. Nuclear problems of nonaqueous fluid fuel reactors dr. A eutectic mixture of lithium fluoride and beryllium fluoride called flibe, with fertile thorium and u or pu dissolved in the fluoride molten salt 7 lifbef 2 thf 4 233uf 4 in liquid fuel. The thtr300 was a heliumcooled hightemperature reactor with a pebblebed reactor core consisting of approximately 670,000 spherical fuel compacts each 6 centimetres 2. Thorium fuel cycle for a molten salt reactor american society for. Hence, thorium and thorium based fuel as metal, oxide or carbide, has been utilized in combination with fissile 235 u or 239 pu in nuclear research and power reactors for conversion to fissile 233 u, thereby enlarging the fissile material. During the fuel burning, thorium 232 transforms into a fissile uranium 233. It is found that thorium fuel can be utilized in molten salt reactors.
This talk will examine the history of thorium reactors. Among other subjects covered is thorium based fuel. Fission of u233 in the reactor generates thermal power as well as excess neutrons that would be captured in a blanket fluid containing thorium tetrafluoride in solution. The thorium fuel cycle and lftr power plant the thorium fuel cycle is based on a series of neutron absorption and beta decay processes initiated by neutron absorption and beta decay reactions starting with naturally occurring thorium 232 as the fertile material and the artificial uranium233 12 u233 isotope as the fissile reactor fuel. Current development in thorium fueled reactors shows that they can be designed to operate in the fast or thermal spectrum. Liquid fuel nuclear reactors thorium energy alliance.
The reactor would ideally be started by a modest inventory of uranium233. Fastspectrum molten salt reactors fsmsr can use all isotopes of uranium, not just the 0. The thorium fuel cycle and lftr power plant the thorium fuel cycle is based on a series of neutron absorption and beta decay processes initiated by neutron absorption and beta decay reactions starting with naturally occurring thorium 232 as the fertile material and the artificial uranium233 92 u 233 isotope as the fissile reactor fuel. The reactor utilizes the thorium fuel cycle using separ. The pdf retained the formatting of the original fluid fuel reactor book. A similar concept can also be applied to for the msre, moltensalt fuel directly flows in holes msr. The iaea has maintained an interest in the thorium fuel cycle and its. A nuclear reactor and method for generating energy from fertile and fissile nuclear fuel material. Unlike natural uranium, natural thorium contains only trace amounts of fissile material such as thorium 231, which are insufficient to initiate and sustain nuclear chain.
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