Thorium-based nuclear power

The use of thorium to breed uranium-233 (²³³U) was first discovered in 1940 by Glenn Seaborg, from the neutron bombardment of thorium in a cyclotron.{{cite thesis |last=Sorensen |first=Kirk |date=May 2014 |title=Thorium Research in the Manhattan Project Era |url=https://trace.tennessee.edu/utk_gradthes/2758/ |degree=MSc |publisher=University of Tennessee, Knoxville |access-date=2025-02-11}} During the Manhattan Project, after the construction of the X-10 Graphite Reactor, Seaborg quickly realized the potential of uranium-233 as a fissile material.{{cite web |author= |date=2018-10-08 |title=50th Anniversary of U-233 Start of MSRE |url=https://flibe.com/news/50th-anniversary-of-u-233-start-of-msre/ |website=Flibe Energy |location= |publisher= |access-date=2025-02-11}} Research continued throughout the Manhattan Project; however, it was largely sidelined in the weapons program in favor of plutonium, which had been discovered by Seaborg in February 1941.

With the formation of the Atomic Energy Commission, uranium-based nuclear reactors were built to produce electricity. The first to do so was the experimental uranium breeder EBR-I. In the United States, many of these reactors were light-water reactors starting with the Shippingport Atomic Power Station. These were similar to the reactor designs that produced the propulsion for propelling nuclear submarines. Several other types of reactors were constructed, such as the Liquid metal cooled reactors like EBR-I, or gas-cooled reactors such as Peach Bottom Unit 1 and Fort St. Vrain.

During this period, thorium was investigated by the AEC for use in nuclear weapons, as well as for power generation.{{cite report |last1=Moment |first1=R. |last2=Gibbs |first2=F. |last3=Freiboth |first3=C. |date=1999-04-01 |title=History of Uranium-233 Processing at the Rocky Flats Plant |url=https://sgp.fas.org/othergov/doe/lanl/osti/769018.pdf |publisher=ICF Kaiser |access-date=2025-02-11}} Several tons of uranium-233 were bred from thorium in AEC reactors, some of which was processed at the Rocky Flats Plant. Uranium-233 was used in the MET shot of the Operation Teapot series of nuclear tests.

File:Thorium reactor ORNL.jpg) nuclear reactor at Oak Ridge National Laboratory in the 1960s]]

Several commercial power-generating reactors were also fueled with thorium-uranium mixed oxides, including Indian Point, Peach Bottom,{{cite journal |last=Birely |first=William |date=1973-07-05 |title=Operating Experience of the Peach Bottom Atomic Power Station |url=https://www.sciencedirect.com/science/article/abs/pii/0029549374900429 |url-access=subscription |journal=Nuclear Engineering and Design |volume=26 |issue=1 |pages=9-15 |doi=10.1016/0029-5493(74)90042-9 |access-date=}} and Fort St. Vrain.{{cite report |author= |date=June 2020 |title=Department of Energy-Managed Spent Nuclear Fuel at Fort St. Vrain |url=https://www.nwtrb.gov/docs/default-source/facts-sheets/doe-snf-fact-sheet---fort-st-vrain-rev-1.pdf?sfvrsn=14 |publisher=U.S. Nuclear Waste Technical Review Board |access-date=2025-02-11}} Around the same time, the government of the United States built the Molten-Salt Reactor Experiment, a prototype molten salt reactor, using uranium-233 fuel. The MSRE reactor, built at Oak Ridge National Laboratory, operated critical for roughly 15,000 hours from 1965 to 1969 (at a power level somewhat under 8 MWth). In 1968, Glenn Seaborg, the chairman of the AEC, publicly announced that a ²³³U-based reactor had been successfully developed and tested.{{cite journal |last1=Humphrey |first1=Uguru Edwin |last2=Khandaker |first2=Mayeen Uddin |title=Viability of thorium-based nuclear fuel cycle for the next generation nuclear reactor: Issues and prospects |journal=Renewable and Sustainable Energy Reviews |date=December 2018 |volume=97 |pages=259–275 |doi=10.1016/j.rser.2018.08.019 |bibcode=2018RSERv..97..259H }}{{cite web |author= |date=2024-05-09 |title=Proof of concept: The Molten Salt Reactor Experiment in Nuclear News |url=https://www.ans.org/news/article-6024/proof-of-concept-the-molten-salt-reactor-experiment-in-inuclear-newsi/ |website=Nuclear Newswire |publisher=American Nuclear Society |access-date=2025-02-11}} For its final year of operation, the reactor was briefly fueled with plutonium fluoride. The project's leaders also proposed a test run using plutonium fuel, however this was never carried out due to the project's cancellation.{{cite web |last=Sorensen |first=Kirk |date=2019-12-24 |title=50th anniversary of MSRE shutdown |url=https://energyfromthorium.com/2019/12/24/msre-shutdown-50th/ |website=Thorium Energy |access-date=2025-02-11}}

Despite the project's apparent success, the MSRE was shut down in December 1969 due to pressure from Milton Shaw, the director of the AEC's Reactor Development and Testing Division.{{cite magazine |last=Rofer |first=Cheryl |date=2015-08-07 |title=Why did the US abandon a lead in reactor design? |url=https://pubs.aip.org/physicstoday/Online/9780/Why-did-the-US-abandon-a-lead-in-reactor-design |magazine=Physics Today |publisher=American Institute of Physics |doi=10.1063/PT.5.2029 |access-date=2025-02-11}} At the time, the US government was heavily interested in breeder reactors to meet the projected need for nuclear fuel. Shaw pressured the MSRE team, led by Oak Ridge director Alvin Weinberg, to end the project due to his preference for the other competing breeder design at the time, the liquid metal fast breeder reactor.{{cite web |last=Sorensen |first=Kirk |date=2006-04-22 |title=A Brief History of the Liquid-Fluoride Reactor |url=https://energyfromthorium.com/2006/04/22/a-brief-history-of-the-liquid-fluoride-reactor/ |website=Thorium Energy |access-date=2025-02-11}}{{cite web |last=Sorensen |first=Kirk |date=2008-09-23 |title=Milton Shaw: And the decline of the American Nuclear Establishment |url=https://energyfromthorium.com/2008/09/23/milton-shaw-and-the-decline-of-the-american-nuclear-establishment/ |website=Thorium Energy |access-date=2025-02-11}}

By 1973, due to Shaw's influence, the US government had essentially settled on uranium technology and largely discontinued thorium-related nuclear research. The reasons were that uranium-fueled reactors were considered more efficient, the research into uranium was proven and thorium's breeding ratio was thought insufficient to produce enough fuel to support development of a commercial nuclear industry. As Moir and Teller later wrote, "The competition came down to a liquid metal fast breeder reactor (LMFBR) on the uranium-plutonium cycle and a thermal reactor on the thorium-²³³U cycle, the molten salt breeder reactor. The LMFBR had a larger breeding rate ... and won the competition." In their opinion, the decision to stop development of thorium reactors, at least as a backup option, "was an excusable mistake". The government pushed ahead with the LMFBR design with the Clinch River Breeder Reactor Project starting in 1970, however the project encountered substantial political opposition and was finally cancelled in 1983.

In 2009, science writer Richard Martin stated that Weinberg, who was director at Oak Ridge and primarily responsible for the MSRE, lost his job as director because he championed development of thorium reactors.{{cite magazine |last=Martin |first=Richard |date=2009-12-21 |title=Uranium Is So Last Century — Enter Thorium, the New Green Nuke |url=https://www.wired.com/magazine/2009/12/ff_new_nukes/ |magazine=WIRED |publisher= |access-date= |archive-url=https://web.archive.org/web/20100626014207/http://www.wired.com/magazine/2009/12/ff_new_nukes/ |archive-date=2010-06-26 |url-status=dead}} Weinberg himself recalls this period:

{{quote|[Congressman] Chet Holifield was clearly exasperated with me, and he finally blurted out, "Alvin, if you are concerned about the safety of reactors, then I think it may be time for you to leave nuclear energy." I was speechless. But it was apparent to me that my style, my attitude, and my perception of the future were no longer in tune with the powers within the AEC.[https://www.youtube.com/watch?v=5LeM-Dyuk6g "LFTR in 10 Minutes] {{Webarchive|url=https://web.archive.org/web/20170302055623/https://www.youtube.com/watch?v=5LeM-Dyuk6g |date=2 March 2017 }}, video presentation}}

At the time, Martin claimed that Weinberg's unwillingness to sacrifice potentially safe nuclear power for the benefit of military uses forced him to retire. However, in his 2012 book SuperFuel, Martin refuted the idea that thorium was rejected by the AEC because of the desire for weapons production:

{{quote|The theory is now repudiated not only by more circumspect scientists like Jess Gehin, a senior program manager for reactor technology at Oak Ridge, but by many in the thorium movement. The evidence that Shaw and the AEC killed the MSBR specifically because it wasn't an efficient producer of weapons-grade plutonium is thin. But that misses the point.{{cite book |last=Martin |first=Richard |date=2012 |title=SuperFuel: Thorium, the Green Energy Source for the Future |url=https://us.macmillan.com/books/9781137278340/superfuel/ |publisher=Palgrave Macmillan |isbn=9781137278340 |access-date=2025-02-11}}{{rp|p=138}}}}

Even after the cancellation of the MSRE, thorium research continued. Admiral Hyman Rickover, the developer of naval nuclear propulsion and head of the U.S. Naval Reactors office, had pushed for a thorium-fueled breeder project since 1963{{cite book |last=Duncan |first=Francis |date=1989 |title=Rickover and the Nuclear Navy: The Discipline of Technology |url=https://www.usni.org/press/books/rickover-and-nuclear-navy |publisher=Naval Institute Press |page=190-231 |isbn=9780870212369 |access-date=2025-02-11}} and organized the construction of a light-water breeder reactor (LWBR) project in 1976. First reaching criticality on August 26, 1977, this project successfully turned the Shippingport Atomic Power Station, the first peacetime nuclear power plant, into a demonstration ²³²Th−²³³U breeder reactor. After successful operation until 1982, the reactor was found to have a breeding ratio of 1.4%.

In Germany, the AVR pebble-bed reactor utilized mixed-oxide ²³⁵U−²³²Th TRISO fuel, and operated from 1967 until 1988.{{cite journal |last1=Damahuri |first1=Abdul Hannan |last2=Mohamed |first2=Hassan |last3=Mohamed |first3=Abdul Aziz |date=December 2017 |title=Overview on Thorium in Research Reactors |url=https://www.nuklearmalaysia.org/images/JNRT/2017/JNRT2017-14-02-02.pdf |journal=Journal of Nuclear and Related Technologies |volume=14 |issue=2 |publisher= |pages= |doi= |access-date=2025-02-11}} Based on the AVR design, the [[THTR-300|Thorium High-Temperature

Reactor (THTR-300)]], a 300MWe commercial reactor was constructed and commenced operation in 1985. However, both reactors were plagued with design issues. THTR-300 was shut down in 1989, after only four years of operation.

Despite the documented history of thorium nuclear power, and successful demonstration of thorium-based breeding by the operation of the LWBR core at Shippingport, by 2009 many nuclear experts were nonetheless unaware of it. According to Chemical & Engineering News, "most people—including scientists—have hardly heard of the heavy-metal element and know little about it", noting a comment by a conference attendee that "it's possible to have a Ph.D. in nuclear reactor technology and not know about thorium energy."{{cite magazine |last=Jacoby |first=Mitch |date=16 November 2009 |title=Reintroducing Thorium |url=http://pubsapp.acs.org/cen/science/87/8746sci2.html |magazine=Chemical & Engineering News |volume=87 |issue=46 |pages=44–46 |access-date=13 May 2020 |archive-date=24 April 2020 |archive-url=https://web.archive.org/web/20200424040053/http://pubsapp.acs.org/cen/science/87/8746sci2.html |url-status=live }} Nuclear physicist Victor J. Stenger, for one, first learned of it in 2012:

{{quote|It came as a surprise to me to learn recently that such an alternative has been available to us since World War II, but not pursued because it lacked weapons applications.{{cite news|last=Stenger|first=Victor J.|title=LFTR: A Long-Term Energy Solution?|url=http://www.huffingtonpost.com/victor-stenger/lftr-a-longterm-energy-so_b_1192584.html|newspaper=Huffington Post|date=Jan 9, 2012|author-link=Victor J Stenger|access-date=11 July 2012|archive-date=22 December 2016|archive-url=https://web.archive.org/web/20161222022144/http://www.huffingtonpost.com/victor-stenger/lftr-a-longterm-energy-so_b_1192584.html|url-status=live}}}}

Others, including former NASA scientist and prominent thorium advocate Kirk Sorensen, agree that "thorium was the alternate path".{{cite AV media |last=Sorensen |first=Kirk |date=2009-07-23 |title=Energy From Thorium: A Nuclear Waste Burning Liquid Salt Thorium Reactor |url=https://www.youtube.com/watch?v=AZR0UKxNPh8 |work=Google Tech Talks |language=en |publisher=YouTube |url-status=live |archive-url=https://web.archive.org/web/20161019155938/https://www.youtube.com/watch?v=AZR0UKxNPh8#at=219 |archive-date=2016-10-19}}{{rp|p=2}} According to Sorensen, during a documentary interview, he states that if the US had not discontinued its research in 1974 it could have "probably achieved energy independence by around 2000".[https://www.youtube.com/watch?v=GQ9Ll5EX1jc "The Thorium Dream"] {{Webarchive|url=https://web.archive.org/web/20161126033016/https://www.youtube.com/watch?v=GQ9Ll5EX1jc |date=26 November 2016 }}, Motherboard TV video documentary, 28 min.

On 18 May 2022, US Senator Tommy Tuberville introduced US Senate bill S.4242 – "A bill to provide for the preservation and storage of uranium-233 to foster development of thorium molten-salt reactors", the 'Thorium Energy Security Act', a measure which Sorensen had urged since 2006.Sorensen, Kirk [https://energyfromthorium.com/2022/05/18/thorium-act-released/ (18 May 2022) "Thorium Energy Security Act" released] However, it was not adopted by Congress.

• Abundance. Thorium is three times as abundant as uranium and nearly as abundant as lead and gallium in the Earth's crust.Goswami, D. Yogi, ed. The CRC Handbook of Mechanical Engineering, Second Edition, CRC Press (2012) pp. 7–45 The Thorium Energy Alliance estimates "there is enough thorium in the United States alone to power the country at its current energy level for over 1,000 years."[http://www.world-nuclear.org/info/inf62.html#References Thorium] {{Webarchive|url=https://web.archive.org/web/20120419180325/http://www.world-nuclear.org/info/inf62.html#References |date=19 April 2012 }}, World Nuclear Association "America has buried tons as a by-product of rare earth metals mining", notes Evans-Pritchard.Evans-Pritchard, Ambrose. [https://www.telegraph.co.uk/finance/comment/7970619/Obama-could-kill-fossil-fuels-overnight-with-a-nuclear-dash-for-thorium.html "Obama could kill fossil fuels overnight with a nuclear dash for thorium"] {{Webarchive|url=https://web.archive.org/web/20210513054742/https://www.telegraph.co.uk/finance/comment/7970619/Obama-could-kill-fossil-fuels-overnight-with-a-nuclear-dash-for-thorium.html |date=13 May 2021 }}, The Telegraph, UK 29 August 2010 Almost all thorium is fertile Th-232, compared to uranium that is composed of 99.3% fertile U-238 and 0.7% more valuable fissile U-235.
• Less suitable for bombs. It is difficult to make a practical nuclear bomb from a thorium reactor's by-products, allowing governments to potentially pursue further nuclear power without worsening nuclear arms proliferation. Thorium is not fissile like uranium, so packed thorium nuclei will not begin to split apart and explode. However the uranium-233 used in the cycle is fissile and hence can be used to create a nuclear weapon- though plutonium production is reduced. According to Alvin Radkowsky, designer of the world's first full-scale atomic electric power plant, "a thorium reactor's plutonium production rate would be less than 2 percent of that of a standard reactor, and the plutonium's isotopic content would make it unsuitable for a nuclear detonation."{{rp|p=11}}[https://www.nytimes.com/2002/03/05/world/alvin-radkowsky-86-developer-of-a-safer-nuclear-reactor-fuel.html "Alvin Radkowsky, 86, Developer Of a Safer Nuclear Reactor Fuel"] {{Webarchive|url=https://web.archive.org/web/20210308135513/https://www.nytimes.com/2002/03/05/world/alvin-radkowsky-86-developer-of-a-safer-nuclear-reactor-fuel.html |date=8 March 2021 }}, obituary, New York Times, 5 March 2002 Several uranium-233 bombs have been tested, but the presence of uranium-232 tended to "poison" the uranium-233 in two ways: intense radiation from the uranium-232 made the material difficult to handle, and the uranium-232 led to possible pre-detonation. Separating the uranium-232 from the uranium-233 proved very difficult, although newer laser isotope separation techniques could facilitate that process.{{cite book |title=Introduction to Weapons of Mass Destruction: Radiological, Chemical, and Biological |last=Langford |first=R. Everett |year=2004 |publisher=John Wiley & Sons |location=Hoboken, NJ |isbn=978-0-471-46560-7 |page=85 }}.Ford, James and Schuller, C. Richard. [https://books.google.com/books?id=Y5SrGviKCIsC&pg=PA111 Controlling threats to nuclear security a holistic model] {{Webarchive|url=https://web.archive.org/web/20200820024601/https://books.google.com/books?id=Y5SrGviKCIsC&pg=PA111 |date=20 August 2020 }}, pp. 111–12 (United States Government Printing Office 1997). In the United States, the AEC and DOE processed several kilograms of uranium-233 at Rocky Flats, and successfully used multiple chemical isolation steps to isolate uranium-232 decay products.
• Less nuclear waste. There is less high-level nuclear waste when thorium is used as a fuel in a liquid fluoride thorium reactor—up to two orders of magnitude less, state Moir and Teller, eliminating the need for large-scale or long-term storage;{{rp|p=13}} "Chinese scientists claim that hazardous waste will be a thousand times less than with uranium." The radioactivity of the resulting waste also drops down to safe levels after just one or a few hundred years, compared to tens of thousands of years needed for current nuclear waste to cool off.{{Cite web|url=http://www.energyfromthorium.com/pdf/AmSci_LFTR.pdf|archiveurl=https://web.archive.org/web/20131208020100/http://www.energyfromthorium.com/pdf/AmSci_LFTR.pdf|url-status=dead|title=American Science LFTR|archivedate=8 December 2013}} However, the production of activation products and fission products is broadly similar between thorium and uranium based fuel cycles.
• Fewer reaction startup ingredients. According to Moir and Teller, "once started up [, a breeding reactor] needs no other fuel except thorium because [a breeding reactor] makes most or all of its own fuel." Breeding reactors produce at least as much fissile material as they consume. Non-breeding reactors, on the other hand, require additional fissile material, such as uranium-235 or plutonium to sustain the reaction.
• Harvesting weapons-grade plutonium. The thorium fuel cycle is a potential way to produce long term nuclear energy with low radio-toxicity waste. In addition, the transition to thorium could be done through the incineration of weapons grade plutonium (WPu) or civilian plutonium.{{Cite web|date=May 2005|title=Thorium fuel cycle — Potential benefits and challenges|url=https://www-pub.iaea.org/MTCD/publications/PDF/TE_1450_web.pdf|url-status=live|website=International Atomic Energy Agency|access-date=18 December 2021|archive-date=4 October 2019|archive-url=https://web.archive.org/web/20191004091917/https://www-pub.iaea.org/MTCD/publications/PDF/TE_1450_web.pdf}}
• No enrichment necessary. Since all natural thorium can be used as fuel, no expensive fuel enrichment is needed. However the same is true for U-238, as fertile fuel in the uranium-plutonium cycle.
• Efficiency. Comparing the amount of thorium needed with coal, Nobel laureate Carlo Rubbia of CERN (European Organization for Nuclear Research), estimates that one ton of thorium can produce as much energy as 200 tons of uranium, or 3,500,000 tons of coal.
• Failsafe measures. Liquid fluoride thorium reactors are designed to be meltdown proof. A fusible plug at the bottom of the reactor melts in the event of a power failure or if temperatures exceed a set limit, draining the fuel into an underground tank for safe storage.{{cite web |last1=Juhasz |first1=Albert J. |last2=Rarick |first2=Richard A. |last3=Rangarajan |first3=Rajmohan |title=High Efficiency Nuclear Power Plants Using Liquid Fluoride Thorium Reactor Technology |url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090038711.pdf |website=NASA |date=October 2009 |access-date=27 October 2014 |archive-date=28 April 2021 |archive-url=https://web.archive.org/web/20210428205700/https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090038711.pdf |url-status=live }}
• Mining. Mining thorium is safer and more efficient than mining uranium. Thorium's ore, monazite, generally contains higher concentrations of thorium than the percentage of uranium found in its respective ore. This makes thorium a more cost efficient and less environmentally damaging fuel source. Thorium mining is also easier and less dangerous than uranium mining, as the mine is an open pit—which requires no ventilation, unlike underground uranium mines, where radon levels can be potentially harmful.{{cite web |author=International Atomic Energy Agency |title=Thorium fuel cycle – Potential benefits and challenges |url=http://www-pub.iaea.org/MTCD/Publications/PDF/TE_1450_web.pdf |access-date=27 October 2014 |archive-date=4 August 2016 |archive-url=https://web.archive.org/web/20160804054758/http://www-pub.iaea.org/MTCD/publications/PDF/TE_1450_web.pdf |url-status=live }}

Summarizing some of the potential benefits, Martin offers his general opinion: "Thorium could provide a clean and effectively limitless source of power while allaying all public concern—weapons proliferation, radioactive pollution, toxic waste, and fuel that is both costly and complicated to process."{{rp|p=13}} Moir and Teller estimated in 2004 that the cost for their recommended prototype would be "well under $1 billion with operation costs likely on the order of $100 million per year", and as a result a "large-scale nuclear power plan" usable by many countries could be set up within a decade.

• Significant and expensive testing, analysis and licensing work would be required, requiring business and government support. In a 2012 report on the use of thorium fuel with existing water-cooled reactors, the Bulletin of the Atomic Scientists suggested that it would "require too great an investment and provide no clear payoff", and that "from the utilities' point of view, the only legitimate driver capable of motivating pursuit of thorium is economics".{{cite journal|author=Nelson, Andrew T.|date=Sep–Oct 2012|title=Thorium: Not a near-term commercial nuclear fuel|url=http://bos.sagepub.com/content/68/5/33.full|journal=Bulletin of the Atomic Scientists|volume=68|issue=5|pages=33–44|doi=10.1177/0096340212459125|bibcode=2012BuAtS..68e..33N|s2cid=144725888|access-date=7 January 2013|archive-date=4 November 2015|archive-url=https://web.archive.org/web/20151104171006/http://bos.sagepub.com/content/68/5/33.full|url-status=live|url-access=subscription}}
• The cost of fabrication and reprocessing is higher than using traditional solid fuel rods.{{cite report |url=http://network.bellona.org/content/uploads/sites/4/Certain-issues-of-economic-prospects-of-thorium-based-nuclear-energy-systems.pdf |title=Certain issues of economic prospects of thorium-based nuclear energy systems |first=Leonid |last=Andreev |publisher=Bellona Foundation |year=2013 |access-date=10 March 2017 |archive-date=12 March 2017 |archive-url=https://web.archive.org/web/20170312050229/http://network.bellona.org/content/uploads/sites/4/Certain-issues-of-economic-prospects-of-thorium-based-nuclear-energy-systems.pdf |url-status=live }}
• Thorium, when irradiated for use in reactors, makes uranium-232, which emits gamma rays. This irradiation process may be altered slightly by removing protactinium-233. The decay of the protactinium-233 would then create uranium-233 in lieu of uranium-232 for use in nuclear weapons—making thorium into a dual purpose fuel.{{cite web|url=http://www.popularmechanics.com/science/energy/nuclear/is-the-superfuel-thorium-riskier-than-we-thought-14821644|title="Superfuel" Thorium a Proliferation Risk?|date=5 December 2012|access-date=24 February 2014|archive-date=27 October 2014|archive-url=https://web.archive.org/web/20141027082326/http://www.popularmechanics.com/science/energy/nuclear/is-the-superfuel-thorium-riskier-than-we-thought-14821644|url-status=live}}{{cite web |last1=Uribe |first1=Eva C. |title=Thorium power has a protactinium problem |date=6 August 2018 |url=https://thebulletin.org/2018/08/thorium-power-has-a-protactinium-problem/ |publisher=Bulletin of the Atomic Scientists |access-date=7 August 2018 |archive-date=6 August 2018 |archive-url=https://web.archive.org/web/20180806160237/https://thebulletin.org/2018/08/thorium-power-has-a-protactinium-problem/ |url-status=live }}
• The melting point of thorium dioxide (3350 °C) is greater than that of uranium dioxide (2800 °C), resulting in a need for increased sintering temperature or addition of non-reactive sintering aids to produce thorium dioxide-based fuel.{{cite book |title=Thorium fuel cycle: potential benefits and challenges |url=https://www-pub.iaea.org/MTCD/Publications/PDF/TE_1450_web.pdf |date=May 2005 |publisher=International Atomic Energy Agency |location=Vienna |isbn=9201034059 |id=IAEA-TECDOC-1450}}{{rp|p=2}}
• Thorium is a fertile material, rather than a fissile one. This means that the fuel must be used in conjunction with a separate fissile material, such as uranium or plutonium, in order to start and maintain the chain reaction required to generate power.{{cite web |title=Thorium |date=2 May 2017 |url=https://world-nuclear.org/information-library/current-and-future-generation/thorium |publisher=World Nuclear Association |access-date=7 November 2024}}{{cite web |title=Thorium's Long-Term Potential in Nuclear Energy: New IAEA Analysis |date=25 September 2024 |url=https://www.iaea.org/newscenter/news/thoriums-long-term-potential-in-nuclear-energy-new-iaea-analysis |publisher=International Atomic Energy Agency |access-date=7 November 2024}}
• Thorium has relatively low applicability in non-nuclear power generation settings, resulting in a very small demand for exploring thorium reserves.

Nobel laureate in physics and former director of CERN Carlo Rubbia has long been a fan of thorium. According to Rubbia, "In order to be vigorously continued, nuclear power must be profoundly modified".{{Cite web|title=Thorium trumps all fuels as energy source|url=https://www.zdnet.com/article/nobel-physicist-thorium-trumps-all-fuels-as-energy-source/|website=ZDNet|access-date=29 May 2021|archive-date=2 March 2021|archive-url=https://web.archive.org/web/20210302093012/https://www.zdnet.com/article/nobel-physicist-thorium-trumps-all-fuels-as-energy-source/|url-status=live}}

Hans Blix, former director general of the International Atomic Energy Agency, has said "Thorium fuel gives rise to waste that is smaller in volume, less toxic and much less long lived than the wastes that result from uranium fuel".{{Cite web|title=Hans Blix: Nuclear must use thorium fuel to reduce weapons risk|url=https://www.zdnet.com/article/hans-blix-nuclear-must-use-thorium-fuel-to-reduce-weapons-risk/|website=ZDnet|access-date=29 May 2021|archive-date=26 January 2021|archive-url=https://web.archive.org/web/20210126032007/https://www.zdnet.com/article/hans-blix-nuclear-must-use-thorium-fuel-to-reduce-weapons-risk/|url-status=live}}

{{update|section|date=July 2021}}

Research and development of thorium-based nuclear reactors, primarily the liquid fluoride thorium reactor (LFTR), MSR design, has been or is now being done in the United States, United Kingdom, Germany, Brazil, India, Indonesia, China, France, the Czech Republic, Japan, Russia, Canada, Israel, Denmark and the Netherlands. Conferences with experts from as many as 32 countries are held, including one by the European Organization for Nuclear Research (CERN) in 2013, which focuses on thorium as an alternative nuclear technology without requiring production of nuclear waste.[http://www.indiablooms.com/EnvironmentDetailsPage/2013/environmentDetails171013a.php "CERN to host conference on thorium technologies for energy"] {{Webarchive|url=https://web.archive.org/web/20131019090632/http://www.indiablooms.com/EnvironmentDetailsPage/2013/environmentDetails171013a.php |date=19 October 2013 }}, India Blooms, 17 October 2013 Among other recognized experts, Hans Blix, former head of the International Atomic Energy Agency, calls for expanded support of new nuclear power technology, and states, "the thorium option offers the world not only a new sustainable supply of fuel for nuclear power but also one that makes better use of the fuel's energy content."[http://www.4-traders.com/LIGHTBRIDGE-CORP-5641100/news/Lightbridge-Corp--Hans-Blix-Urges-Support-for-Thorium-Power-Development-17344436/ "Lightbridge Corp : Hans Blix Urges Support for Thorium Power Development"] {{Webarchive|url=https://web.archive.org/web/20131022151104/http://www.4-traders.com/LIGHTBRIDGE-CORP-5641100/news/Lightbridge-Corp--Hans-Blix-Urges-Support-for-Thorium-Power-Development-17344436/ |date=22 October 2013 }}, 11 October 2013

CANDU reactors are capable of using thorium,{{Cite web|url=http://solarcellsguide.com/nuclears-future-fission-or-fizzle-as-ottawa-readies-to-sell-its-candu-operations-industry-insiders-wonder-why-nuclear-energy-cant-get-any-respect.htm|archiveurl=https://web.archive.org/web/20110827141131/http://solarcellsguide.com/nuclears-future-fission-or-fizzle-as-ottawa-readies-to-sell-its-candu-operations-industry-insiders-wonder-why-nuclear-energy-cant-get-any-respect.htm|url-status=dead|title=Nuclear's future: Fission or fizzle?|archivedate=27 August 2011}}{{cite journal | doi =10.1016/j.enconman.2005.10.013 | title =Investigation of CANDU reactors as a thorium burner | year =2006 | last1 =Sahin | first1 =S|last2 =Yildiz | first2 =K | last3 =Sahin | first3 =H | last4 =Acir | first4 =A | journal =Energy Conversion and Management | volume =47 | issue =13–14 | page =1661| bibcode =2006ECM....47.1661S }} and Thorium Power Canada has, in 2013, planned and proposed developing thorium power projects for Chile and Indonesia.[http://nextbigfuture.com/2013/07/thorium-power-canada-is-in-advanced.html "Thorium Power Canada is in advanced talks with Chile and Indonesia for 10 MW and 25 MW solid thorium fueled reactors"] {{Webarchive|url=https://web.archive.org/web/20131019044105/http://nextbigfuture.com/2013/07/thorium-power-canada-is-in-advanced.html |date=19 October 2013 }} Nextbigfuture.com, 1 July 2013 The proposed 10 MW demonstration reactor in Chile could be used to power a 20 million litre/day desalination plant. In 2018, the New Brunswick Energy Solutions Corporation announced the participation of Moltex Energy in the nuclear research cluster that will work on research and development of small modular reactor technology.{{Cite web|url=https://www2.gnb.ca/content/gnb/en/news/news_release.2018.07.0930.html|title=Moltex to partner in nuclear research and innovation cluster|first=Canada|last=Government of New Brunswick|date=13 July 2018|website=www2.gnb.ca|access-date=9 October 2018|archive-date=9 October 2018|archive-url=https://web.archive.org/web/20181009211435/https://www2.gnb.ca/content/gnb/en/news/news_release.2018.07.0930.html|url-status=live}}{{Cite web|url=https://globalnews.ca/news/4330793/nuclear-technology-nb-investment/|title=Second company investing in nuclear technology in N.B.|website=Global News|access-date=9 October 2018|archive-date=9 October 2018|archive-url=https://web.archive.org/web/20181009211932/https://globalnews.ca/news/4330793/nuclear-technology-nb-investment/|url-status=live}}{{Cite web|url=https://www.neimagazine.com/news/newsuk-moltex-seeks-to-deploy-its-stable-salt-reactor-in-canada-6254922|title=UK Moltex seeks to deploy its Stable Salt Reactor in Canada - Nuclear Engineering International|website=www.neimagazine.com|date=18 July 2018 |access-date=22 May 2021|archive-date=7 March 2021|archive-url=https://web.archive.org/web/20210307181444/https://www.neimagazine.com/news/newsuk-moltex-seeks-to-deploy-its-stable-salt-reactor-in-canada-6254922|url-status=live}}

At the 2011 annual conference of the Chinese Academy of Sciences, it was announced that "China has initiated a research and development project in thorium MSR technology."[http://energyfromthorium.com/2011/01/30/china-initiates-tmsr/China Initiates Thorium MSR Project « Energy from Thorium] {{Webarchive|url=https://web.archive.org/web/20220424140325/https://energyfromthorium.com/2006/06/20/china-and-india-their-problems-are-our-problems/ |date=24 April 2022 }}. Energyfromthorium.com (30 January 2011). Retrieved on 2011-05-01.
{{cite journal|last1=Kamei|first1=Takashi|last2=Hakami|first2=Saeed|year=2011|title=Evaluation of implementation of thorium fuel cycle with LWR and MSR|journal=Progress in Nuclear Energy|volume=53|issue=7|page=820|doi=10.1016/j.pnucene.2011.05.032|bibcode=2011PNuE...53..820K }}
Martin, Richard. [https://www.wired.com/wiredscience/2011/02/china-thorium-power/ "China Takes Lead in Race for Clean Nuclear Power"] {{Webarchive|url=https://web.archive.org/web/20140312200007/http://www.wired.com/wiredscience/2011/02/china-thorium-power/ |date=12 March 2014 }}, Wired, 1 February 2011 The World Nuclear Association notes that the China Academy of Sciences in January 2011 announced its R&D program, "claiming to have the world's largest national effort on it, hoping to obtain full intellectual property rights on the technology." According to Martin, "China has made clear its intention to go it alone," adding that China already has a monopoly over most of the world's rare earth minerals.{{rp|p=157}}Evans-Pritchard, Ambrose. [https://www.telegraph.co.uk/finance/comment/ambroseevans_pritchard/8393984/Safe-nuclear-does-exist-and-China-is-leading-the-way-with-thorium.html "Safe nuclear does exist, and China is leading the way with thorium"] {{Webarchive|url=https://web.archive.org/web/20180325101614/https://www.telegraph.co.uk/finance/comment/ambroseevans_pritchard/8393984/Safe-nuclear-does-exist-and-China-is-leading-the-way-with-thorium.html |date=25 March 2018 }} Telegraph, UK, 20 March 2011

In early 2012, it was reported that China, using components produced by the West and Russia, planned to build two prototypes, one of them a molten salt-cooled pebble-bed reactor by 2015,{{rp|minute 1:37}}{{rp|minute 44:20}} and a research molten salt reactor{{rp|minute 54:00}} by 2017,{{Cite web|url=https://www.youtube.com/watch?v=5UT2yYs5YJs|title=Kun Chen from Chinese Academy of Sciences on China Thorium Molten Salt Reactor TMSR Program|via=www.youtube.com|date=6 Aug 2012 |access-date=9 August 2021|archive-date=25 August 2012|archive-url=https://web.archive.org/web/20120825154638/http://www.youtube.com/watch?v=5UT2yYs5YJs&gl=US&hl=en|url-status=live}} had budgeted the project at $400 million and requiring 400 workers. China also finalized an agreement with a Canadian nuclear technology company to develop improved CANDU reactors using thorium and uranium as a fuel.[http://www.newswire.ca/en/story/1016061/candu-signs-expanded-agreement-with-china-to-further-develop-recycled-uranium-and-thorium-fuelled-candu-reactors "Candu Signs Expanded Agreement with China to Further Develop Recycled Uranium and Thorium Fuelled CANDU Reactors"] {{Webarchive|url=https://web.archive.org/web/20150701170337/http://www.newswire.ca/en/story/1016061/candu-signs-expanded-agreement-with-china-to-further-develop-recycled-uranium-and-thorium-fuelled-candu-reactors |date=1 July 2015 }}, Canada Newswire, 2 August 2012

Dr. Jiang Mianheng, son of China's former leader Jiang Zemin, led a thorium delegation in non-disclosure talks at Oak Ridge National Laboratory, Tennessee, and by late 2013 China had officially partnered with Oak Ridge to aid China in its own development.{{cite web |author1=David Lague |author2=Charlie Zhu |title=The U.S. government lab behind China's nuclear power push |url=http://in.reuters.com/article/breakout-thorium-idINL4N0FE21U20131220 |website=Reuters |access-date=11 May 2024 |archive-url=https://web.archive.org/web/20181123125037/https://in.reuters.com/article/breakout-thorium-idINL4N0FE21U20131220 |archive-date=23 November 2018 |date=20 Dec 2013 |url-status=dead}}[http://www.smartplanet.com/blog/intelligent-energy/watch-replay-of-nuclears-future-with-dash-of-rare-earth-political-intrigue/11586?tag=content;siu-container "Watch replay of nuclear's future, with dash of rare earth, political intrigue"] {{Webarchive|url=https://web.archive.org/web/20131018004036/http://www.smartplanet.com/blog/intelligent-energy/watch-replay-of-nuclears-future-with-dash-of-rare-earth-political-intrigue/11586?tag=content;siu-container |first= Mark |last=Halper|date=18 October 2013 }}, Smart Planet, 23 December 2011, includes video

{{anchor|low carbon}}In March 2014, with their reliance on coal-fired power having become a major cause of their current "smog crisis", they reduced their original goal of creating a working reactor from 25 years down to 10. "In the past, the government was interested in nuclear power because of the energy shortage. Now they are more interested because of smog", said Professor Li Zhong, a scientist working on the project. "This is definitely a race", he added.[http://www.scmp.com/news/china/article/1452011/chinese-scientists-urged-develop-new-thorium-nuclear-reactors-2024 "Chinese scientists urged to develop new thorium nuclear reactors by 2024"] {{Webarchive|url=https://web.archive.org/web/20140319154438/http://www.scmp.com/news/china/article/1452011/chinese-scientists-urged-develop-new-thorium-nuclear-reactors-2024 |date=19 March 2014 }}, South China Morning Post, 19 March 2014

By 2019 two of the reactors were under construction in the Gobi desert, with completion expected around 2025. China expects to put thorium reactors into commercial use by 2030. The 60{{nbsp}}MWt reactor is scheduled to be completed in 2029. Part of the thermal energy, 10{{nbsp}}MW will be used to create electrical power; the remainder will be used to evolve hydrogen by splitting water molecules at high temperature.Stephen Chen [https://www.scmp.com/news/china/science/article/3271978/china-sets-launch-date-worlds-first-thorium-molten-salt-nuclear-power-station (26 Jul 2024) China sets launch date for world's first thorium molten salt nuclear power station]

{{Main|TMSR-LF1}}

One of the 2 MWt thorium prototypes, was nearing completion in 2021.{{Cite web|url=https://newatlas.com/energy/china-world-first-thorium-nuclear-reactor/|title=China adding finishing touches to world-first thorium nuclear reactor|date=20 July 2021|website=New Atlas|access-date=25 July 2021|archive-date=25 July 2021|archive-url=https://web.archive.org/web/20210725152139/https://newatlas.com/energy/china-world-first-thorium-nuclear-reactor/|url-status=live}}{{cite journal |last1=Mallapaty |first1=Smriti |title=China prepares to test thorium-fuelled nuclear reactor |journal=Nature |date=16 September 2021 |volume=597 |issue=7876 |pages=311–312 |doi=10.1038/d41586-021-02459-w |pmid=34504330 |bibcode=2021Natur.597..311M |s2cid=237471852 }} As of 24 June 2021, China has reported that the Gobi molten salt reactor will be completed on schedule with tests beginning as early as September 2021. The new reactor is a part of Chinese leader Xi Jinping's drive to make China carbon-neutral by 2060.{{Cite news|last=Ben|first=Turner|date=24 June 2021|title=China Creates New Thorium Reactor|work=Live Science|url=https://www.livescience.com/china-creates-new-thorium-reactor.html|access-date=10 August 2021|archive-date=8 August 2021|archive-url=https://web.archive.org/web/20210808235742/https://www.livescience.com/china-creates-new-thorium-reactor.html|url-status=live}} China's National Nuclear Safety Administration has issued a license to the Shanghai Institute of Applied Physics (SINAP) of the Chinese Academy of Sciences China hopes to complete the world's first commercial thorium reactor by 2030 and has planned to further build more thorium power plants across the low populated deserts and plains of western China, as well as up to 30 nations involved in China's Belt and Road Initiative.{{Cite web|date=2021-07-20|title=China adding finishing touches to world-first thorium nuclear reactor|url=https://newatlas.com/energy/china-world-first-thorium-nuclear-reactor/|access-date=2021-09-30|website=New Atlas|language=en-US|archive-date=25 July 2021|archive-url=https://web.archive.org/web/20210725152139/https://newatlas.com/energy/china-world-first-thorium-nuclear-reactor/|url-status=live}}{{Cite web|date=2021-08-04|title=China Says It's Closing in on Thorium Nuclear Reactor|url=https://spectrum.ieee.org/china-closing-in-on-thorium-nuclear-reactor|access-date=2021-09-30|website=IEEE Spectrum|language=en|archive-date=5 August 2021|archive-url=https://web.archive.org/web/20210805112419/https://spectrum.ieee.org/china-closing-in-on-thorium-nuclear-reactor|url-status=live}}

In August 2022, the Chinese Ministry of Ecology and Environment informed the Shanghai Institute of Applied Physics (SINAP) that its commissioning plan for the LF1 had been approved.{{cite web |date=9 August 2022 |title=Chinese molten-salt reactor cleared for start up |url=https://www.world-nuclear-news.org/Articles/Chinese-molten-salt-reactor-cleared-for-start-up |access-date=9 August 2022 |website=World Nuclear News |publisher=World Nuclear Association}}

On 16 June 2023, China's National Nuclear Safety Administration issued a license to the Shanghai Institute of Applied Physics (SINAP) of the Chinese Academy of Sciences to operate TMSR-LF1, a 2{{nbsp}}MWt reactor.{{cite web |last1=Carpineti |first1=Alfredo |title=Experimental Molten Salt Nuclear Reactor Gets Go-Ahead In China |url=https://www.iflscience.com/experimental-molten-salt-nuclear-reactor-gets-go-ahead-in-china-69417 |website=IFLScience |access-date=11 May 2024 |date=June 16, 2023}}{{cite web |title=China's experimental molten salt reactor receives licence |url=https://www.neimagazine.com/news/newschinas-experimental-molten-salt-reactor-receives-licence-10952226 |website=Nuclear Engineering International |publisher=Progressive Media International |access-date=11 May 2024 |date=20 June 2023}}{{cite web |title=Operating permit issued for Chinese molten salt reactor |url=https://www.world-nuclear-news.org/Articles/Operating-permit-issued-for-Chinese-molten-salt-re |website=World Nuclear News |publisher=World Nuclear Association |access-date=11 May 2024 |date=15 June 2023}}

In October 2023, the reactor went critical;Aamir Khollam [https://www.msn.com/en-us/money/companies/china-builds-world-s-first-working-thorium-reactor-using-declassified-us-documents/ar-AA1D8hlw (18 April 2025) China builds world’s first working thorium reactor using declassified US documents] in June 2024, the reactor reached full power (2 MWt); by October 2024, fresh Thorium replenished the molten-salt fuel of the reactor, in a first.

Copenhagen Atomics is a Danish molten salt technology company developing mass manufacturable molten salt reactors. The Copenhagen Atomics Waste Burner is a single-fluid, heavy water moderated, fluoride-based, thermal spectrum and autonomously controlled molten-salt reactor. This is designed to fit inside of a leak-tight, {{Convert | 40 | foot | adj = on}}, stainless steel shipping container. The heavy water moderator is thermally insulated from the salt and continuously drained and cooled to below {{Convert | 50 | °C}}. A molten lithium-7 deuteroxide (7LiOD) moderator version is also being researched. The reactor utilizes the thorium fuel cycle using separated plutonium from spent nuclear fuel as the initial fissile load for the first generation of reactors, eventually transitioning to a thorium breeder.{{Cite journal |date= |title=Advances in Small Modular Reactor Technology Developments 2018 |url=https://aris.iaea.org/Publications/SMR-Book_2018.pdf |journal=IAEA Advanced Reactors Information System (ARIS)}} Copenhagen Atomics is actively developing and testing valves, pumps, heat exchangers, measurement systems, salt chemistry and purification systems, and control systems and software for molten salt applications.{{Cite AV media |url=https://www.youtube.com/watch?v=U434Sy9BGf8 |title=THORIUM: World's CHEAPEST Energy! [Science Unveiled] |date=2023-09-22 |last=Copenhagen Atomics |access-date=2024-07-22 |via=YouTube}}

In July of 2024, Copenhagen Atomics announced that their reactor is ready to be tested in a real life scenario with a critical experiment at the Paul Scherrer Institute in Switzerland in 2026.{{Cite web |title=Copenhagen Atomics enlists PSI to validate reactor technology : New Nuclear - World Nuclear News |url=https://www.world-nuclear-news.org/Articles/Copenhagen-Atomics-enlists-PSI-to-validate-reactor |access-date=2024-07-22 |website=www.world-nuclear-news.org}}

The German THTR-300 was a prototype commercial power station using thorium as fertile and highly enriched U-235 as fissile fuel. Though named thorium high temperature reactor, mostly U-235 was fissioned. The THTR-300 was a helium-cooled high-temperature reactor with a pebble-bed reactor core consisting of approximately 670,000 spherical fuel compacts each 6 centimetres (2.4 in) in diameter with particles of uranium-235 and thorium-232 fuel embedded in a graphite matrix. It fed power to Germany's grid for 432 days in the late 1980s, before it was shut down for cost, mechanical and other reasons.

India has the largest supplies of thorium in the world, with comparatively poor quantities of uranium. India has projected meeting as much as 30% of its electrical demands through thorium by 2050.{{cite news|last1=Katusa|first1=Marin|title=The Thing About Thorium: Why The Better Nuclear Fuel May Not Get A Chance|url=https://www.forbes.com/sites/energysource/2012/02/16/the-thing-about-thorium-why-the-better-nuclear-fuel-may-not-get-a-chance/2/|access-date=17 November 2014|work=Forbes|date=16 February 2012|pages=2|archive-date=29 November 2014|archive-url=https://web.archive.org/web/20141129040159/http://www.forbes.com/sites/energysource/2012/02/16/the-thing-about-thorium-why-the-better-nuclear-fuel-may-not-get-a-chance/2/|url-status=live}}

In February 2014, the Bhabha Atomic Research Centre (BARC), in Mumbai, India, presented their latest design for a "next-generation nuclear reactor" that burns thorium as its fuel ore, calling it the Advanced Heavy Water Reactor (AHWR). They estimated the reactor could function without an operator for 120 days.[http://indiatoday.intoday.in/story/worlds-first-thorium-based-nuclear-reactor-barc/1/343569.html "Design of World's first Thorium based nuclear reactor is ready"] {{Webarchive|url=https://web.archive.org/web/20140215063240/http://indiatoday.intoday.in/story/worlds-first-thorium-based-nuclear-reactor-barc/1/343569.html |date=15 February 2014 }}, India Today, 14 February 2014 Validation of its core reactor physics was underway by late 2017.{{Citation

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According to Ratan Kumar Sinha, chairman of the Atomic Energy Commission of India, "This will reduce our dependence on fossil fuels, mostly imported, and will be a major contribution to global efforts to combat climate change." Because of its inherent safety, they expect that similar designs could be set up "within" populated cities, like Mumbai or Delhi.

India is amongst a handful of countries in the world with a detailed, funded, government-approved plan to focus on thorium-based nuclear power. The country currently gets under 2% of its electricity from nuclear power, with the rest coming from coal (60%), hydroelectricity (16%), other renewable sources (12%) and natural gas (9%).Energy policy of India#Electricity generation It expects to produce around 25% of its electricity from nuclear power. In 2009 the chairman of the Indian Atomic Energy Commission said that India has a "long-term objective goal of becoming energy-independent based on its vast thorium resources to meet India's economic ambitions."[https://www.nytimes.com/2009/10/20/business/global/20renthorium.html?pagewanted=1&sq=Thorium%20reactor&st=cse&scp=1 "Considering an Alternative Fuel for Nuclear Energy"] {{Webarchive|url=https://web.archive.org/web/20190701111724/https://www.nytimes.com/2009/10/20/business/global/20renthorium.html?pagewanted=1&sq=Thorium%20reactor&st=cse&scp=1 |date=1 July 2019 }}, The New York Times, 19 October 2009{{YouTube|id=Nl5DiTPw3dk|"India's experimental Thorium Fuel Cycle Nuclear Reactor [NDTV Report]}} 2010, 7 minutes

In late June 2012, India announced that their "first commercial fast reactor" was near completion, making India amongst the leading nations in thorium research. "We have huge reserves of thorium. The challenge is to develop technology for converting this to fissile material," stated Srikumar Banerjee, the former Chairman of India's Atomic Energy Commission.{{cite web |url=http://www.thehindu.com/todays-paper/tp-national/article3582922.ece |title=First commercial fast reactor nearly ready |archive-url=https://web.archive.org/web/20160203152543/http://www.thehindu.com/todays-paper/tp-national/article3582922.ece |archive-date=3 February 2016 |newspaper=The Hindu |date=29 June 2012 }} That vision of using thorium in place of uranium was set out in the 1950s by physicist Homi Bhabha.{{cite news |last1=Rahman |first1=Maseeh |title=How Homi Bhabha's vision turned India into a nuclear R&D leader |url=https://www.theguardian.com/environment/2011/nov/01/homi-bhabha-india-thorium-nuclear |work=The Guardian |date=1 November 2011 }}{{cite press release |title=A future energy giant? India's thorium-based nuclear plans |url=https://phys.org/news/2010-10-future-energy-giant-india-thorium-based.html |work=phys.org |publisher=Institute of Physics |date=1 October 2010 }}{{cite journal |last1=Chalmers |first1=Matthew |title=Enter the thorium tiger |journal=Physics World |date=October 2010 |volume=23 |issue=10 |pages=40–45 |doi=10.1088/2058-7058/23/10/35 |bibcode=2010PhyW...23j..40C }}{{cite news |last1=Rahman |first1=Maseeh |title=India plans 'safer' nuclear plant powered by thorium |url=https://www.theguardian.com/environment/2011/nov/01/india-thorium-nuclear-plant |work=The Guardian |date=1 November 2011 }}

In 2013, India's 300{{nbsp}}MWe AHWR (pressurized heavy water reactor) was slated to be built at an undisclosed location.{{Cite web|url=https://pib.gov.in/newsite/erelease.aspx?relid=98897|title=Press Information Bureau|website=pib.gov.in|access-date=22 May 2021|archive-date=27 February 2021|archive-url=https://web.archive.org/web/20210227070246/https://pib.gov.in/newsite/erelease.aspx?relid=98897|url-status=live}} The design envisages a start up with reactor grade plutonium that breeds U-233 from Th-232. Thereafter, thorium is to be the only fuel.{{cite book |doi=10.1002/9781118043493.ch12 |chapter=Global Perspective on Thorium Fuel |title=Nuclear Energy Encyclopedia |date=2011 |last1=Anantharaman |first1=K. |last2=Rao |first2=P. R. Vasudeva |pages=89–100 |isbn=978-0-470-89439-2 }} As of 2017, the design was in the final stages of validation.{{cite news |url=http://www.neimagazine.com/features/featurefuel-for-indias-nuclear-ambitions-5782668/ |title=Fuel for India's nuclear ambitions |publisher=Nuclear Engineering International |date=7 April 2017 |access-date=12 April 2017 |archive-date=12 April 2017 |archive-url=https://web.archive.org/web/20170412224826/http://www.neimagazine.com/features/featurefuel-for-indias-nuclear-ambitions-5782668/ |url-status=live }}

The 500 MWe Prototype Fast Breeder Reactor (PFBR) was initially planned to be completed in September 2010, but experienced several delays. It is scheduled to be put into service in December 2024.{{Cite web |title=Indigenous fast breeder reactor set to become critical: AEC chief |author=Srinivas Laxman |work=The Times of India |date=18 September 2024 |access-date=17 November 2024 |url= https://timesofindia.indiatimes.com/india/indigenous-fast-breeder-reactor-set-to-become-critical-aec-chief/articleshow/113436524.cms |url-status=live |archive-url=https://archive.today/20241117110413/https://timesofindia.indiatimes.com/india/indigenous-fast-breeder-reactor-set-to-become-critical-aec-chief/articleshow/113436524.cms |archive-date=17 November 2024}} Despite these delays, India's commitment to long-term nuclear energy production is underscored by the approval in 2015 of ten new sites for reactors of unspecified types, though procurement of primary fissile material—preferably plutonium—may be problematic due to India's low uranium reserves and capacity for production.{{cite news|url=http://www.thehindu.com/opinion/op-ed/fast-forwarding-to-thorium/article7834156.ece|title=Fast forwarding to thorium|first=Jaideep A.|last=Prabhu|newspaper=The Hindu|date=3 November 2015|access-date=9 January 2016|archive-date=3 February 2016|archive-url=https://web.archive.org/web/20160203152543/http://www.thehindu.com/opinion/op-ed/fast-forwarding-to-thorium/article7834156.ece|url-status=live}}

KAMINI (Kalpakkam Mini reactor), is India's only thorium-based experimental reactor. It produces 30{{nbsp}}kW of thermal energy at full power.{{cite report |last1=Ramanarayanan |first1=R. R. |last2=Anandkumar |first2=V. |last3=Mohanakrishnan |first3=P. |last4=Pillai |first4=C.P. |last5=Kumar |first5=P.V. |last6=Kapoor |first6=R.P. |date=June 2000 |title=Kamini reactor commissioning and operating experience, research facilities and their utilization |url=https://www-pub.iaea.org/mtcd/publications/pdf/csp_004c/pdffiles/008.pdf |publisher=International Atomic Energy Agency |docket=RN:31043004 |access-date=17 November 2024 |archive-url=http://web.archive.org/web/20240601062059/https://www-pub.iaea.org/mtcd/publications/pdf/csp_004c/pdffiles/008.pdf |archive-date=1 June 2024}} KAMINI is cooled and moderated by light water, and fuelled with uranium-233 metal produced by the thorium fuel cycle harnessed by the neighbouring FBTR reactor.

P3Tek, an agency of the Indonesia Ministry of Energy and Mineral Resource, has reviewed a thorium molten salt reactor by Thorcon called the TMSR-500. The study reported that building a ThorCon TMSR-500 would meet Indonesia's regulations for nuclear energy safety and performance.{{Cite web|title=P3Tek Recommends Thorcon Molten Salt Nuclear Reactor for Indonesia {{!}} NextBigFuture.com|url=https://www.nextbigfuture.com/2019/09/p3tek-recommends-thorcon-molten-salt-nuclear-reactor-for-indonesia.html|access-date=17 May 2021|archive-date=11 May 2021|archive-url=https://web.archive.org/web/20210511113527/https://www.nextbigfuture.com/2019/09/p3tek-recommends-thorcon-molten-salt-nuclear-reactor-for-indonesia.html|url-status=live}}

In May 2010, researchers from Ben-Gurion University of the Negev in Israel and Brookhaven National Laboratory in New York began to collaborate on the development of thorium-based reactors designed to have a breeding ratio of just over 1,{{cite web |last1=Leichman |first1=Abigail Klein |title=Self-sustaining nuclear energy from Israel |url=http://www.israel21c.org/201010118407/environment/self-sustaining-nuclear-energy-from-israel |work=ISRAEL21c News Service |archive-url=https://web.archive.org/web/20101014020528/http://www.israel21c.org/201010118407/environment/self-sustaining-nuclear-energy-from-israel |archive-date=14 October 2010 |quote=The goal is a self-sustaining reactor, meaning one that will produce and consume about the same amounts of fuel.}} a feature only possible for light water reactors if they use uranium-233 fuel.{{cite report |last1=Hecker |first1=HC |last2=Freeman |first2=LB |title=Design features of the Light Water Breeder Reactor (LWBR) which improve fuel utilization in light water reactors (LWBR development program) |date=August 1981 |publisher=Bettis Atomic Power Laboratory |doi=10.2172/6083371 |page=11 |quote=The primary advantage of the U-233/thorium cycle in thermal reactors is that the average number of neutrons produced per atom of fissile fuel destroyed by neutron absorption is large enough for U-233 to permit breeding in a thermal reactor, whereas for either U-235 or Pu-239 this quantity is too small to permit breeding in a thermal reactor.}}

In June 2012, Japan utility Chubu Electric Power wrote that they regard thorium as "one of future possible energy resources".Halper, Mark. [http://www.smartplanet.com/blog/intelligent-energy/safe-nuclear-japanese-utility-elaborates-on-thorium-plans/16570 "Safe nuclear: Japanese utility elaborates on thorium plans"] {{Webarchive|url=https://web.archive.org/web/20120707052401/http://www.smartplanet.com/blog/intelligent-energy/safe-nuclear-japanese-utility-elaborates-on-thorium-plans/16570 |date=7 July 2012 }} Smart Planet, 7 June 2012

In 2010, Aker Solutions purchased patents from Nobel Prize winning physicist Carlo Rubbia for the design of a proton accelerator-based thorium nuclear power plant.{{cite web |last=Boyle |first=Rebecca |url=http://www.popsci.com/technology/article/2010-08/thorium-reactors-could-wean-world-oil-just-five-years |title=Development of Tiny Thorium Reactors Could Wean the World Off Oil In Just Five Years {{pipe}} Popular Science |publisher=Popsci.com |date=30 August 2010 |access-date=6 September 2013 |archive-date=14 March 2021 |archive-url=https://web.archive.org/web/20210314192625/https://www.popsci.com/technology/article/2010-08/thorium-reactors-could-wean-world-oil-just-five-years/ |url-status=live }} In late 2012, Norway's privately owned Thor Energy, in collaboration with the government and Westinghouse, announced a four-year trial using thorium in an existing nuclear reactor.[http://www.smartplanet.com/blog/bulletin/norway-ringing-in-thorium-nuclear-new-year-with-westinghouse-at-the-party/6421 "Norway ringing in thorium nuclear New Year with Westinghouse at the party"] {{Webarchive|url=https://web.archive.org/web/20121128045818/http://www.smartplanet.com/blog/bulletin/norway-ringing-in-thorium-nuclear-new-year-with-westinghouse-at-the-party/6421 |date=28 November 2012 }}, Smartplanet, 23 November 2012

In South Africa, Steenkampskraal Thorium's planned 100{{nbsp}}MW HTMR-100 NPP reactor is based on a variant of the Pebble bed modular reactor.{{Cite journal |title=Thorium could avert the energy crisis : mining |url=https://journals.co.za/doi/abs/10.10520/EJC176757 |journal=Environmental Management |date=July 2015 |volume=7 |issue=1 |pages=18–19 |hdl=10520/EJC176757 |via=Sabinet}}{{Cite web|url=https://www.thorium100.com/Th100%20Reactor.php|title=Steenkampskraal Thorium (Pty) Limited (STL Nuclear)}}

In Britain, one organisation promoting or examining research on thorium-based nuclear plants is The Alvin Weinberg Foundation. House of Lords member Bryony Worthington is promoting thorium, calling it "the forgotten fuel" that could alter Britain's energy plans.[http://www.smartplanet.com/blog/intelligent-energy/the-thorium-lord/16717?tag=search-river "The Thorium Lord"] {{Webarchive|url=https://web.archive.org/web/20120727091317/http://www.smartplanet.com/blog/intelligent-energy/the-thorium-lord/16717?tag=search-river |date=27 July 2012 }}, Smart Planet, 17 June 2012 However, in 2010, the UK's National Nuclear Laboratory (NNL) concluded that for the short to medium term, "...the thorium fuel cycle does not currently have a role to play," in that it is "technically immature, and would require a significant financial investment and risk without clear benefits", and concluded that the benefits have been "overstated". Friends of the Earth UK considers research into it as "useful" as a fallback option.{{cite web |url=http://www.foe.co.uk/blog/thorium_30112.html |title=Thorium reactors and nuclear fusion |last=Childs |first=Mike |publisher=Friends of the Earth UK |date=24 March 2011 |archive-url=https://web.archive.org/web/20110707144358/http://www.foe.co.uk/blog/thorium_30112.html |archive-date=7 July 2011}}

In its January 2012 report to the United States Secretary of Energy, the Blue Ribbon Commission on America's Future notes that a "molten-salt reactor using thorium [has] also been proposed".[http://brc.gov/sites/default/files/documents/brc_finalreport_jan2012.pdf Blue Ribbon Commission Report] {{Webarchive|url=https://web.archive.org/web/20120807061024/http://brc.gov/sites/default/files/documents/brc_finalreport_jan2012.pdf |date=7 August 2012 }}, January 2012 That same month it was reported that the US Department of Energy is "quietly collaborating with China" on thorium-based nuclear power designs using an MSR.Halper, Mark. [http://www.smartplanet.com/blog/intelligent-energy/us-partners-with-china-on-new-nuclear/17037?tag=search-river "U.S. partners with China on new nuclear"] {{Webarchive|url=https://web.archive.org/web/20130919025430/http://www.smartplanet.com/blog/intelligent-energy/us-partners-with-china-on-new-nuclear/17037?tag=search-river |date=19 September 2013 }}, Smart Planet, 26 June 2012

Some experts and politicians want thorium to be "the pillar of the U.S. nuclear future".[http://viewer.zmags.com/publication/3205d068#/3205d068/23 "U-turn on Thorium"] {{Webarchive|url=https://web.archive.org/web/20210308104206/http://viewer.zmags.com/publication/3205d068#/3205d068/23 |date=8 March 2021 }} Future Power Technology, July 2012 pp. 23–24 Then-Senators Harry Reid and Orrin Hatch supported using $250 million in federal research funds to revive ORNL research. In 2009, Congressman Joe Sestak unsuccessfully attempted to secure funding for research and development of a destroyer-sized reactor [reactor of a size to power a destroyer] using thorium-based liquid fuel.[http://www.govtrack.us/congress/bills/111/hr1534 H.R. 1534 (111th)] {{Webarchive|url=https://web.archive.org/web/20131020124738/https://www.govtrack.us/congress/bills/111/hr1534 |date=20 October 2013 }} "To direct the Secretary of Defense and the Chairman of the Joint Chiefs of Staff to jointly carry out a study on the use of thorium-liquid fueled nuclear reactors for naval power needs, and for other purposes." Introduced: 16 March 2009 Status: Died (Referred to Committee)

Alvin Radkowsky, chief designer of the world's second full-scale atomic electric power plant in Shippingport, Pennsylvania, founded a joint US and Russian project in 1997 to create a thorium-based reactor, considered a "creative breakthrough".Friedman, John S., Bulletin of the Atomic Scientists, September 1997 pp. 19–20 In 1992, while a resident professor in Tel Aviv, Israel, he founded the US company, Thorium Power Ltd., near Washington, D.C., to build thorium reactors.

The primary fuel of the proposed HT³R research project near Odessa, Texas, United States, will be ceramic-coated thorium beads. The reactor construction has not yet begun.{{cite news|url=https://www.oaoa.com/news/business/article_b13f0336-7550-11e6-b261-4bcc6390ecc4.html|title=UTPB, private company to push for advanced reactor|publisher=OA Online|date=8 September 2016|author=Paul, Corey|access-date=27 November 2019|archive-date=27 November 2019|archive-url=https://web.archive.org/web/20191127204638/https://www.oaoa.com/news/business/article_b13f0336-7550-11e6-b261-4bcc6390ecc4.html|url-status=live}} Estimates to complete a reactor were originally set at ten years in 2006 (with a proposed operational date of 2015).{{cite news|url=http://www.thoriumpower.com/files/Energy%20Daily%20on%20Texas%20Reactor.PDF|archive-url=https://web.archive.org/web/20110717051942/http://www.thoriumpower.com/files/Energy%20Daily%20on%20Texas%20Reactor.PDF|archive-date=17 July 2011|title=Advanced reactor plan gets off the ground in Texas|publisher=The Energy Daily|date=23 February 2006|author=Lobsenz, George}}

On the research potential of thorium-based nuclear power, Richard L. Garwin, winner of the Presidential Medal of Freedom, and Georges Charpak advise further study of the Energy amplifier in their book Megawatts and Megatons (2001), pp. 153–63.

Clean Core Thorium Energy, a Chicago-based corporation created and patented a proprietary mixture of uranium and thorium for HALEU (High Assay Low Enriched Uranium). The fuel mixture is called ANEEL (Advanced Nuclear Energy for Enriched Life), in honor of Anil Kakodkar. HALEU has uranium that has been enriched to a level greater than 5% but less than 20% as per World Nuclear Association and needs cutting-edge nuclear reactor designs that are currently under development. But as per Mehul Shah, the founder and CEO of Clean Core Thorium Energy, operational CANDU reactors and its derivatives, such as IPHWR can accommodate ANEEL. According to Sean McDeavitt, professor in the Texas A&M University Department of Nuclear Engineering and Director of the Nuclear Engineering and Science Center, ANEEL is a first-of-its-kind nuclear fuel that blends thorium and HALEU in a proprietary, unique composition. To advance the creation and implementation of ANEEL, Canadian Nuclear Laboratories (CNL) and Clean Core inked a Memorandum of Understanding in April 2023. CNL agreed to support Clean Core's R&D and licensing efforts as part of the MoU.{{Cite web |last=Ramesh |first=M. |date=2024-01-07 |title=This new nuclear fuel can guarantee India's green energy transition |url=https://www.thehindubusinessline.com/business-tech/this-new-nuclear-fuel-can-guarantee-indias-green-energy-transition/article67716078.ece |access-date=2024-02-14 |website=BusinessLine |language=en}}

{{Main|Occurrence of thorium}}

{{Further|List of countries by thorium resources}}

Thorium is mostly found with the rare earth phosphate mineral, monazite, which contains up to about 12% thorium phosphate, but 6–7% on average. World monazite resources are estimated to be about 12 million tons, two-thirds of which are in heavy mineral sands deposits on the south and east coasts of India. There are substantial deposits in several other countries (see table "World thorium reserves"). Monazite is a good source of REEs (rare earth elements), but monazites are currently not economical to produce because the radioactive thorium that is produced as a byproduct would have to be stored indefinitely. However, if thorium-based power plants were adopted on a large-scale, virtually all the world's thorium requirements could be supplied simply by refining monazites for their more valuable REEs.{{Cite web|url=https://www.youtube.com/watch?v=fLR39sT_bTs|title=Kennedy Rare-Earth-Elements (REE) Briefing to IAEA, United Nations|date=27 July 2014 |via=www.youtube.com|access-date=19 April 2018|archive-date=24 April 2022|archive-url=https://web.archive.org/web/20220424140543/https://www.youtube.com/watch?v=fLR39sT_bTs|url-status=live}}

Another estimate of reasonably assured reserves (RAR) and estimated additional reserves (EAR) of thorium comes from OECD/NEA, Nuclear Energy, "Trends in Nuclear Fuel Cycle", Paris, France (2001).{{cite book|url=http://www-pub.iaea.org/MTCD/publications/PDF/TE_1450_web.pdf|title=IAEA: Thorium fuel cycle – Potential benefits and challenges|pages=45 (table 8), 97 (ref 78)|access-date=23 January 2014|archive-date=4 August 2016|archive-url=https://web.archive.org/web/20160804054758/http://www-pub.iaea.org/MTCD/publications/PDF/TE_1450_web.pdf|url-status=live}} (see table "IAEA Estimates in tons"){{rp|p.102}}

The preceding figures are reserves and as such refer to the amount of thorium in high-concentration deposits inventoried so far and estimated to be extractable at current market prices; millions of times more total exist in Earth's 3{{e|19}} tonne crust, around 120 trillion tons of thorium, and lesser but vast quantities of thorium exist at intermediate concentrations.Ragheb, M. (12 August 2011) [https://www.scribd.com/doc/105448071/Thorium-Resources-in-Rare-Earth-Elements-Ragheb-M-Aug-2011 Thorium Resources In Rare Earth Elements] {{Webarchive|url=https://web.archive.org/web/20160327025425/https://www.scribd.com/doc/105448071/Thorium-Resources-in-Rare-Earth-Elements-Ragheb-M-Aug-2011 |date=27 March 2016 }}. scribd.comAmerican Geophysical Union, Fall Meeting 2007, abstract #V33A-1161. [http://adsabs.harvard.edu/abs/2007AGUFM.V33A1161P Mass and Composition of the Continental Crust] {{Webarchive|url=https://web.archive.org/web/20190127015302/http://adsabs.harvard.edu/abs/2007AGUFM.V33A1161P |date=27 January 2019 }} Proved reserves are a good indicator of the total future supply of a mineral resource.

In water-cooled reactors, the input fuel which needs to be utilized are not thorium, but rather mixed oxide fuels (MOX fuel){{cite web |title=Mixed Oxide (MOX) Fuel |date=10 October 2017 |url=https://world-nuclear.org/information-library/nuclear-fuel-cycle/fuel-recycling/mixed-oxide-fuel-mox |publisher=World Nuclear Association |access-date=7 November 2024}} or thorium plutonium oxide fuels (TOX fuel);{{cite journal |last1=Mustafa |first1=S.S. |title=Feasibility Study of Thorium-Plutonium Mixed Oxide Assembly In Light Water Reactors |journal=Nature |date=8 November 2019 |volume=9 |issue=1 |page=16308 |doi=10.1038/s41598-019-52560-4 |pmid=31704959 |pmc=6842006 |bibcode=2019NatSR...916308M |url=https://doi.org/10.1038/s41598-019-52560-4 |access-date=7 November 2024}} These fuels can be separated into three categories:{{cite book |title=Near Term and Promising Long Term Options for the Deployment of Thorium Based Nuclear Energy |date=2022 |publisher=IAEA |location=Vienna |isbn=978-92-0-139622-8 |url=https://www-pub.iaea.org/MTCD/Publications/PDF/TE-2009web.pdf |access-date=7 November 2024}}

• (Th-LEU) MOX fuels contain uranium dioxide in high weight contents (10-30%).
• (Th-Pu) TOX fuels have low plutonium dioxide contents (2-8%)
• (Th-233U) MOX fuels have low uranium dioxide contents (2-5%)

Firstly, the individual dioxides which comprise the fuel are powderized. These powders are then doped to limit radioactivity, as well as enhancing their sinterability. The varying powders are then mixed/milled together to form a homogenous powder, which is then compacted into the pellets to be used as fuel.{{cite web |title=Nuclear Fuel and its Fabrication |date=13 October 2021 |url=https://world-nuclear.org/information-library/nuclear-fuel-cycle/conversion-enrichment-and-fabrication/fuel-fabrication |publisher=World Nuclear Association |access-date=7 November 2024}}

According to the World Nuclear Association, seven types of reactors can use thorium fuel. Six have entered into service at some point:

• Heavy water reactors (PHWRs)
• Advanced Heavy Water Reactor (AHWR)
• Aqueous homogeneous reactors (AHRs) have been proposed as a fluid fueled design that could accept naturally occurring uranium and thorium suspended in a heavy water solution.{{Cite web|url=http://moltensalt.org/references/static/downloads/pdf/FFR_chap01.pdf|title=FFR Chapter 1|access-date=20 March 2013|archive-date=4 November 2012|archive-url=https://web.archive.org/web/20121104203600/http://moltensalt.org/references/static/downloads/pdf/FFR_chap01.pdf|url-status=live}} AHRs have been built and according to the IAEA reactor database, seven are currently in operation as research reactors.
• Boiling (light) water reactors (BWRs)
• Pressurized (light) water reactors (PWRs)
• Molten salt reactors (MSRs), including liquid fluoride thorium reactors (LFTRs).{{cite journal |last1=Banerjee |first1=S. |last2=Gupta |first2=H. P. |last3=Bhardwaj |first3=S. A. |title=Nuclear Power from Thorium:Different Options |journal=Current Science |date=November 2016 |volume=111 |issue=10 |pages=1607 |doi=10.18520/cs/v111/i10/1607-1623 }}
• Molten salt breeder reactors, or MSBRs, use thorium to breed more fissile material.{{cite journal |last1=Vijayan |first1=P K |last2=Basak |first2=A |last3=Dulera |first3=I V |last4=Vaze |first4=K K |last5=Basu |first5=S |last6=Sinha |first6=R K |title=Conceptual design of Indian molten salt breeder reactor |journal=Pramana |date=September 2015 |volume=85 |issue=3 |pages=539–554 |doi=10.1007/s12043-015-1070-0 |bibcode=2015Prama..85..539V |s2cid=117404500 }}
• High-temperature gas-cooled reactors (HTRs)
• Fast neutron reactors (FNRs)
• {{anchor|ADS}} Accelerator driven reactors (ADS)

• Accelerator-driven subcritical reactor
• Generation IV reactor
• India's three-stage nuclear power programme
• List of countries by thorium resources

{{-}}

{{reflist|group="Note"}}

{{reflist}}

• [http://www-pub.iaea.org/mtcd/publications/pdf/te_1450_web.pdf Thorium fuel cycle – Potential benefits and challenges], International Atomic Energy Agency
• {{usurped|1=[https://web.archive.org/web/20160306175633/http://itheo.org/ International Thorium Energy Organisation – IThEO.org]}}
• [http://www.ithec.org International Thorium Energy Committee – iThEC]
• [https://www.youtube.com/watch?v=AZR0UKxNPh8 "Energy From Thorium: A Nuclear Waste Burning Liquid Salt Thorium Reactor"], video, 1 hr. 22 min., Kirk Sorensen's presentation at Google's Tech Talk, 20 July 2009
• [https://www.wired.com/2009/12/ff-new-nukes/ "Uranium Is So Last Century – Enter Thorium, the New Green Nuke"] Wired Magazine article
• [http://www.thoriumenergyalliance.com/ Thorium Energy Alliance] – advocacy and educational organisation dedicated to thorium energy
• [http://energyfromthorium.com/ Energy from Thorium] – website about LFTR
• [http://msr21.fc2web.com/english.htm International Thorium Molten-Salt Forum]
• {{Skeptoid | id= 4555| number= 555| title= Thorium Reactors: Fact and Fiction| date= 24 January 2017| quote= | access-date=}}

Category:Nuclear power

Category:Nuclear reactors

Category:Nuclear reactors by type

Category:Thorium