Travelling wave reactor pdf

As a function of time, the latest design represents a standing wave or a soliton, rather than a traveling wave. Travelling wave reactor twr is a fast reactor in which nuclear burning propagates as a wave. Terrapower expects a typical 1,200megawatt traveling wave reactor to produce 5 metric tons of waste per gigawatt year, not 5 metric megatons. Sep 21, 2017 nuclear experts head to china to test experimental reactors by. Terrapower is a technology company headquartered in washington, united states that does research on traveling wave reactors twrs. Onegroup neutron diffusion equation and kinetic equations for nuclei densities are applied to a plane wave in an infinite reactor. A travelingwave reactor twr is a type of nuclear fission reactor that can convert fertile material into usable fuel through nuclear transmutation, in tandem with the burnup of fissile material. Based on this concept, a stepwise radial fuel shuffling strategy was proposed and applied to a sodiumcooled fast reactor sfr loading metallic 238 u fuel.

Dec 04, 20 terrapowers traveling wave reactor twr incorporates inherent safety features and reduces the risk for proliferation in the nuclear energy supply chain. As it runs, the core in a traveling wave reactor gradually converts nonfissile material into the fuel it needs. Boiling water cooled travelling wave reactor sciencedirect. Terrapowers traveling wave reactor twr extends the safety and efficiency of nuclear energy while making it more affordable.

The sodiumcooled reactor experience does not bode well for twrs. Bill gates stops chasing nuclear wave, pursues variety of. Travelingwave reactor twr technology, being developed by terrapower, llc, represents a potential solution to these limitations by offering a nuclear energy resource which is truly sustainable at full global scale for the indefinite future and is deployable in the nearterm. Traveling wave reactor twr technology, being developed by terrapower, llc, represents a potential solution to these limitations by offering a nuclear energy resource which is truly sustainable at full global scale for the indefinite future and is deployable in the nearterm. From the principle of fourier analysis, an anharmonic traveling wave can be. Terrapowers nuclear reactor could power the 21st century. Bill gates and china partner on worldfirst nuclear technology. Travelling wave reactor twr solid core heatpipe micro. To create the traveling wave reactor twr design, terrapower has put together a team. A private company called terrapower which is funded by bill gates among others has supposedly completed a design and is looking to actually build the first reactor. Traveling wave reactor wikimili, the free encyclopedia. Jul 24, 20 bill gates stops chasing nuclear wave, pursues variety of reactors.

The analytic thermal hydraulic solution for water density is obtained and used for neutronic calculations. The reactor uses depleteduranium fuel packed inside hundreds of hexagonal pillars shown in black and green. Unlike todays reactors, a travelingwave reactor requires very little enriched uranium, reducing the risk of weapons proliferation. Not all equations admit travelling wave solutions, as demonstrated below. Paper has made an attempt to obtain travelling waves. Has anyone here ever heard of a terrapower reactor or traveling wave reactor. The travelling wave analysis consists of finding solutions of the telegraphers equations, bearing in mind the characteristics of the transmission lines, the equipment to which they will be connected and the nature of the signals likely to be experienced in power system transient situations.

Pooltype, sodiumcooled fast reactor electrical capacity. A traveling wave reactor twr is a type of nuclear fission reactor that can convert fertile material into usable fuel through nuclear transmutation, in tandem with the burnup of fissile material. Terrapower, cnnc team up on travelling wave reactor world. On some fundamental peculiarities of the traveling wave reactor. Chapter 2 travelling wave tube operation in order to design a helixtype traveling wave tube amplifier twta, it is necessary to understand the operating physics of a travelling wave tube twt. Usbased terrapower has signed a memorandum of understanding with china national nuclear corporation cnnc to develop its travelling wave reactor twr. The most recent commercial demonstration reactors belong. Nuclear experts head to china to test experimental reactors by. Pdf the traveling wave reactor twr is a oncethrough reactor that uses in situ breeding to greatly reduce the need for enrichment and. Terrapowers traveling wave reactor twr is designed to be a liquid sodiumcooled fast reactor that uses depleted uranium as fuel. This reactor does not implement a slow traveling solitonlike wave of neutronnuclear burning mode.

The traveling wave reactor, twr constitutes a reformulation of the liquid metal fast reactor, lmfbr and the coupled cores concepts and a reformulation of battery reactors based on naval propulsion reactors designs. Sustainability of a twr economy 235 the main difference between thermal reactors and fast reactors is the degree to which uranium can be burned. The traveling wave reactor twr is a proposed reactor design that belongs to. Sep 25, 2015 usbased terrapower has signed a memorandum of understanding with china national nuclear corporation cnnc to develop its travelling wave reactor twr. On the basis of the condition for nuclear burning wave existence in the neutronmultiplying media upu and thu cycles we show the. In the low pressure case, it has been shown that the breeding is sufficient and, thus, an asymptotic travelling wave state exists in a low pressure bwr. A truly sustainable and fullscale resource for global energy needs. Bill gates stops chasing nuclear wave, pursues variety. Bill gates on the wrong path with travelling wave reactors. Twrs differ from other kinds of fastneutron and breeder reactors in their ability to use fuel efficiently without uranium enrichment or reprocessing, instead directly using depleted uranium, natural. George is is a nuclear reactor physicist, part of the team that developed the integral fast reactor. The traveling wave reactor twr is a oncethrough reactor that uses in situ breeding to greatly reduce the need for enrichment and reprocessing.

This paper studies the possibility of a boiling water cooled travelling wave reactor. Breeding converts incoming subcritical reload fuel into new critical fuel, allowing a breedburn wave to propagate. Travelingwave reactors twrs are advanced nuclear reactors that are capable of eventually running forever given only depleted uranium fuel. A traveling wave reactor twr is a proposed type of nuclear fission reactor that can convert fertile material into usable fuel through nuclear transmutation, in tandem with the burnup of fissile material. Terrapower, cnnc team up on travelling wave reactor. Relay protection of ehv shunt reactors based on the traveling wave principle jules esztergalyos, senior member, ieee abstractthe measuring technique described in this paper is based on electro magnetic transient program emtp studies of the traveling wave principle. On some fundamental peculiarities of the traveling wave. In this paper, based on the twr core design scheme, considered the design of fuel assembly, neutronics and thermalhydraulic, analyzed the unprotected loss of flow ulof accident in the twr core with the sas4a code, through which research about the transient safety characteristics of a million kilowatt travelling wave reactor core has been done.

Pantak 1department of theoretical and experimental nuclear physics, odessa national polytechnic university, odessa, ukraine 2state ecological academy for postgraduate education, kiev, ukraine. Solid core heatpipe micro reactor which is an ideal technology suited for remote locations where reliability, passive safety and design simplicity. Schematic view terrapowers prototype reactor full name. Bill gates stops chasing nuclear wave, pursues variety of reactors. Comments on terrapowers travelling wave reactor printable pdf version here by dr george s. Travelingwave reactor twr technology, being developed by terrapower, llc, represents a potential solution to these limitations by offering a nuclear energy.

Dec 01, 2011 the traveling wave reactor is a liquidmetalcooled, fastneutron breeder reactor, with many of the same advantages and disadvantages as other fast breeder reactors. Likewise, a typical reactor today produces 21 metric. Numerical studies of stepwise radial fuel shuffling in a. Generation to generation preface the devastating earthquake, tsunami, and consequent multi reactor damage in japan will have a significant impact on the future use of nuclear energy, the nuclear industry, and the global nuclear order. Dec 04, 20 terrapowers traveling wave reactor twr extends the safety and efficiency of nuclear energy while making it more affordable. Nuclear experts head to china to test experimental reactors.

The most recent commercial demonstration reactors belong in the latter category. What are competitions and alternatives to terrapower. It wasnt until the 1990s, though, that potential designs for the twr started to surface. His fission company, terrapower, alters its traveling wave reactor, explores thorium, liquid fuel and alternative designs.

Terrapowers traveling wave reactor twr is designed to be a liquid sodium cooled fast reactor that uses depleted uranium as fuel. Terrapowers traveling wave reactor twr incorporates inherent safety features and reduces the risk for proliferation in the nuclear energy supply chain. Fast travelingwave reactor of the channel type vitaliy d. This paper is aimed to understand a stationary nuclear burning wave nbw as a macroscopic physical process. The travelling wave reactor twr which will produce 15th as much waste as current nuclear plants, while utilizing mostly depleted uranium as its fuel and improving fuel efficiency. The traveling wave that the reactors name references moves through the units core at a rate of only. In general, it follows that any solution to the wave equation can be obtained as a superposition of two travelling waves. Sep 22, 2010 comments on terrapowers travelling wave reactor printable pdf version here by dr george s. In a breeder reactor, of which the traveling wave reactor twr is one specific type, there is typically little or no moderator, so a large fraction of fissions take place with fast neutrons, increasing the average neutron yield per fission and reducing the number of neutrons absorbedlost. But, when it comes to the travelling wave reactor, his money is not. Nov 17, 2010 it wasnt until the 1990s, though, that potential designs for the twr started to surface.

He is now retired from argonne national laboratory after a career. The traveling wave reactor is a liquidmetalcooled, fastneutron breeder reactor, with many of the same advantages and disadvantages as other fast breeder reactors. A travelingwave reactor twr is a proposed type of nuclear fission reactor that can convert fertile material into usable fuel through nuclear transmutation, in tandem with the burnup of fissile material. And while government researchers intermittently bring out new reactor designs, the travelingwave reactor is noteworthy for having come from something that barely exists in the nuclear industry. A travelingwave reactor twr is a proposed type of nuclear fission reactor that can convert. September 20 institute for energy and environmental research. He is now retired from argonne national laboratory after a career of experimental work pertaining to powerreactor safety. Some have operated well, while others have done poorly.

Apr 09, 2010 has anyone here ever heard of a terrapower reactor or traveling wave reactor. This study investigates the principal possibility of a boilingwatercooled travelling wave reactor that can potentially improve the natural uranium utilisation in boiling water reactors bwrs, and more general in watercooled reactors, appreciably. The basic design of the fast uraniumplutonium nuclear travelingwave reactor with a softened neutron spectrum is. Transmission line protection based on travelling waves anuradha s deshpande. Unprotected loss of flow analysis of a million kilowatt. Terrapowers travelling wave reactor why not use an ifr. The traveling wave that the reactor s name references moves through the units core at a rate of only. This chapter provides the basic description of the twta structure and its various components. Paper has made an attempt to obtain travelling waves components in the form of forward wave and backward waves from post fault components of voltage and. First it was presented in papers 5,6 and its advanced implementation was patented in 14.

A truly sustainable and fullscale resource for global energy needs pdf. China isnt building a traveling wave nuclear plant yet. Transmission line protection based on travelling waves. Twrs differ from other kinds of fastneutron and breeder reactors in their ability to use fuel efficiently without uranium enrichment or. Terrapower, cnnc team up on travelling wave reactor 25 september 2015 usbased terrapower has signed a memorandum of understanding with china national nuclear corporation cnnc to develop its travelling wave reactor twr. The traveling wave reactor twr is a proposed reactor design that belongs to a set known as generation iv designs that are different in a number of respects than the current commercial designs which use water to cool the reactor and slow down moderate the neutrons that sustain the chain reaction. On the basis of the condition for nuclear burning wave existence in the neutronmultiplying media upu and thu cycles we show the possibility of surmounting the socalled dpaparameter problem and suggest an algorithm of the optimal nuclear burning wave mode adjustment, which is supposed to yield the wave parameters fluenceneutron flux, width and speed of nuclear burning wave that. The basic design of the fast uraniumplutonium nuclear travelingwave reactor with a soft ened neutron spectrum is developed, which solves. Traveling wave reactors twrs are advanced nuclear reactors that are capable of eventually running forever given only depleted uranium fuel.

The travelling wave reactor concept is for a novel, fast neutron spectrum reactor that would use insitu breeding of its nuclear fuel essentially, the creation of the fuel within the reactor to. A wave reactor on fast neutrons in selfregulating neutronnuclear mode of the second kind is known. Twrs differ from other kinds of fastneutron and breeder reactors in their ability to use fuel. Several times now, ive been in contact with people who talked about the travelling wave reactor, but i cant find any official information about it. The concept of travelling wave reactor twr applies the mechanism of selfsustaining and propagating nuclear fission travelling waves in fertile media of 238 u and 232 th to achieve very high fuel utilization. Sodiumcooled fast reactors have a checkered history. The mou was signed in seattle on 22 september by terrapower ceo lee mcintire and cnnc president qian zhimin. The companys flagship advanced nuclear reactor concept, the traveling wave reactor twr design, represents incredible progress in nuclear technology thanks to the power of advanced computer modeling and our dedicated team of scientists and engineers. Traveling wave reactor wikipedia republished wiki 2. The paper describes the fault protection of ehv shunt reactors. Twr, sstar, and similar proposals differ from previous fast breeders by putting a. Transmission line protection using travelling waves generated at the time of fault are used as trip signals of a travelling wave relay.

The sum is a spatial wave whose amplitude oscillates. The beginnings of terrapower and its nuclear innovations are found in the deliberations between bill gates, nathan myhrvold, lowell wood, and experts during. Relay protection of ehv shunt reactors based on the. Twrs differ from other kinds of fastneutron and breeder reactors in their ability to use fuel efficiently without uranium enrichment or reprocessing, instead directly using depleted uranium.

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