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Thorium challenges nuclear establishment

This article by Robert Orr Jr. blasts Paul Genoa for not enthusiastically supporting Thorium Molten Salt Reactors.


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Weather will not affect LFTRs output

Weather in France slows nuclear power production

We’ve passed the tsunami test, the earthquake test and now the weather test.
I’m half joking but seriously I keep discovering more reasons to switch to LFTRs.
France never embraced Molten Salt Reactors fully but did experiment. Look at how they missed out. Weather conditions would not affect power production with LFTRs because supply of water is not required to cool them.
The seismic activity is not as serious as it would be with LWR’s or BWR’s and Fukushima recently showed that they withstand earthquakes quite well. ZCWUW7HCU7QW

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Public Comment to BRC by Mike Conley

Mike Conley is a writer from L.A., California. He is working on a novel. Has a book being published and working on a script for a documentary. He also attended the Blue Ribbon Commission hearing on May 13th the same week and same city that hosted the third Thorium Energy Alliance Conference. Washington, D.C.
They only give each person three minutes so he was only able to read the first page. He was one of five people who had a statement to support the Liquid Fluoride Thorium Reactor which was originally called a Thorium Molten Salt Breeder Reactor. Keep in mind that any details outlined about the actual design is purely a speculation and broadly based on the original designs from the 1960s by Alvin Weinberg’s team at Oak Ridge National Laboratory. LFTR has flexibility of function and application.

The Thorium Paradigm
The problem is with the reactors we’ve been using to produce it. If the reactors at Fukushima had been Liquid Fluoride Thorium Reactors (LFTRs) they wouldn’t have had a disaster on their hands. 

  1. Liquid-fuel reactor technology was successfully developed at Oak Ridge National Labs in the 1960s. Although the test reactor worked flawlessly, the project was shelved, a victim of Cold War strategy. But LFTRs have been gathering a lot of attention lately, particularly since the tragic events in Japan.
  2. A LFTR is a completely different type of reactor. For one thing, it can’t melt down. It’s physically impossible. And since it’s air-cooled, it doesn’t have to be located near the shore. It can even be placed in an underground vault. A tsunami would roll right over it, like a truck over a manhole cover.
  3. Imagine a kettle of lava that never boils. A LFTR uses liquid fuel.nuclear material dissolved in molten fluoride salt. Conventional reactors are atomic pressure cookers, using solid fuel rods to super-heat water. That means the constant danger of high-pressure ruptures and steam leaks. But liquid fuel can always expand and cool off.
  4. LFTRs don’t even use water. Instead, they heat a common gas like CO2 to spin a turbine for generating power. So if a LFTR does leak, it’s not a catastrophe. Just like lava, the molten salt immediately cools off, quickly becoming an inert lump of rock.
  5. LFTRs burn Thorium, a mildly radioactive material as common as tin and found all over the world. We’ve already mined enough raw Thorium to power the country for 400 years. It’s the waste at our Rare Earth Element mines.
  6. LFTRs consume fuel so efficiently that they can even use the spent fuel from other reactors, while producing a miniscule amount of waste themselves. In fact, the waste from a LFTR is virtually harmless in just 300 years. (No, that’s not a typo.) Yucca Mountain is obsolete. So are Uranium reactors.
  7. LFTR technology has been sitting on the shelf at Oak Ridge for over forty years. But now the manuals are dusted off, and a dedicated group of nuclear industry outsiders is ready to build another test reactor and give it a go. Will it work. If it doesn’t, we’ll have one more reactor to retire.
    But if it does work and there is every reason to believe that it will the LFTR will launch a new American paradigm of clean, cheap, safe and abundant energy.
    Let’s build one and see!

A Uranium reactor is an atomic pressure-cooker – it works just fine until it pops a gasket. Then you’ve got a mess on your hands. Even when it works properly, it wastes 95% of its fuel, making another mess. And the same procedure for making that fuel is used to make nuclear weapons. Is that any way to power a planet.

A Liquid Fluoride Thorium Reactor (LFTR, pronounced “lifter” ) is a completely different approach to generating power, with none of the problems inherent in Uranium reactors and several unique advantages. If the reactors at Fukushima had been LFTRs, Fukushima would never have happened.

The Molten Salt Reactor was the precursor to the LFTR. Developed at Oak Ridge National Labs in the sixties, the MSR performed flawlessly for 20,000 hours. But in spite of its superior design and stellar performance, the program was cancelled – a victim of professional rivalry, personality conflicts, and Cold War strategy.

LFTR technology has literally been sitting on the shelf for over forty years, but it’s been gathering a lot of keen attention lately. Because if LFTRs perform as predicted (and there is a wealth of evidence to suggest that they will) they will go a long way toward resolving the four main problems that everyone has with nuclear energy – Waste, Safety, Proliferation, and Cost.

WASTE: Yucca Mountain is obsolete. Why. Because LFTRs will eat nuclear waste for lunch. They’re designed to burn fuel so efficiently, that they can also consume the spent fuel that’s wasted by Uranium reactors. LFTRs will also be able to consume the cores of dismantled nuclear weapons.

No reactor is waste-free, but a LFTR’s waste will be miniscule. For a LFTR big enough to power a city of one million, the yearly long-term waste would be the size of a basketball, and becomes virtually harmless in just 300 years.

No, that’s not a typo. That’s how clean a LFTR will run. Its main fuel will be Thorium, a mildly radioactive element found all over the world. We have thousands of tons of it already dug up – it’s in the slag piles at our Rare Earth Element mines. (“REEs” are typically found with thorium ore.)
A 1-gigawatt LFTR, big enough to power a city of one million, will run on one ton of pure Thorium a year. The current price for a ton is $107,000 (that’s not a typo, either.) At the end of each year, 1,660 pounds of that ton will be “short-term” waste, meaning it’s virtually harmless in one year. The other 340 lbs (the size of a basketball) will take while longer to mellow out.

SAFETY: Imagine a kettle of lava that simmers but never boils. It’s super-hot, but it’s not under pressure. A LFTR is essentially a kettle of atomic lava. The analogy is accurate – Thorium and Uranium reactions are what keep the earth’s core molten. In a LFTR, Thorium is dissolved in molten (liquefied) fluoride salt. That’s why the Molten Salt Reactor is now called a Liquid Fluoride Thorium Reactor.

If this “lava” ever leaks out (actually, it looks and flows just like green dish soap) there’s no explosion, because there’s nothing around the power plant for the molten salt to react with – LFTRs don’t use water to keep cool, or make steam to spin a turbine. They heat a common gas like CO2 instead.

Since the liquid fuel is never under pressure, a leak would simply “pool and cool” just like lava, quickly forming a blob of solid rock on the reactor room floor. If it spilled into a flooded reactor room, it would behave like the lava flows in Hawaii. A bit of steam would billow off the cooling blob of salt, and that would be it.

Only two percent of the salt mixture is the actual radioactive fuel, and every atom of atomic fuel is chemically bonded to the salt. There are no radioactive particles floating around inside a LFTR, ready to escape. Every particle is bonded to the salt itself, and stays that way until it is burned as fuel. The big problem at Fukushima wasn’t radioactive material such as Cesium leaking out of the reactors. The big problem was that it leaked out and spread into the environment. But if a LFTR leaked any Cesium at all, it would be trace amounts of Cesium Fluoride locked into the fluoride salt. Liquid fuel solves a crucial problem of environmental safety.

Once the salt has cooled, it’s an inert radioactive blob with the consistency of cast iron, and dissolves in water very, very slowly. In fact, the minerals in both fresh and salt water would form a protective crust over the blob, enhancing its ability to withhold contaminants from the environment. So if the reactor room were flooded,
by a tsunami or a hurricane or even sabotage, the amount of material transferred to the environment would be negligible.

Liquid fuel is stable stuff. Below 450°C (about 750°F) it’s just a lump of rock, and can be broken up and collected by robots or other remote machinery. A year after the spill, it can be manually recovered by workers in radiation suits. Like any nuclear fuel, it’s dangerous. But at least it’ll stay put until you can clean it up.

A LFTR will naturally regulate its own temperature, but a Uranium reactor will naturally overheat, unless it’s held back by a robust cooling system. Solid fuel rods get hot, and they also heat each other up, which is a good thing, but they can’t expand or move away from each other to cool themselves off. For a lot of technical reasons, the coolant of choice is super-heated water, which stays liquid as long as it’s kept under pressure. Hence the term “atomic pressure cooker.”

In the partial meltdown at Three Mile Island in 1979, the cooling system failed for a mere ten seconds. That’s all it took. At Fukushima, all the control rods dropped the moment the earthquake hit. Which was good; that stopped the fission process. But the fuel rods were still red hot, and they were still tightly packed together. And, there was no electric power to run the cooling system. So when the tsunami flooded the backup generators, everything went to hell in a hand basket.

Nuclear power is wonderful stuff, but after a series of spectacular near misses and disasters, a lot of people have written off Uranium reactors as accidents waiting to happen. The numbers on the dice are too big, they’ll tell you. The risks are too great. They’ve had it up to here with nuclear power…

But nuclear power isn’t the problem. The problem is with the reactors
we’ve been using to produce it.

LFTRs are completely different. For one thing, they can’t melt down.
Ever. The reason is simple: How do you melt a liquid. Solid fluoride salt melts
at 450°C. With a full load of atomic material, the temperature rises to about 700°C (1,300°F.) If the liquid fuel starts to overheat, it expands, which separates the radioactive
particles and slows the fission process, cooling the molten salt back down again.

This completely eliminates the need for control rods and a cooling system, as well as all of the problems, costs, and risks associated with a pressurized light water reactor. It also entirely eliminates any possibility of a meltdown. Better yet, the fuel will be piped through a processing unit, where the contaminants that spoil solid fuel rods are easily removed. This increases the fuel-burning efficiency of a LFTR to 99%, which greatly reduces the volume and the radioactivity of its waste.

Liquid fuel changes everything.

A LFTR never operates under pressure because even with a full load of nuclear material, the molten salt is still more than 500°C below its boiling point. And if it ever does start to get too hot, a freeze plug of solid salt in a drainpipe below the reactor will melt away. The fuel will empty into a large holding tank and solidify.

On Friday afternoons at Oak Ridge, the research scientists would switch off a common household fan that cooled the freeze plug. The hot salt above the plug would melt it, and the fuel would drain out of the reactor by gravity. On Monday mornings, they would switch on the heating coils and re-melt the fuel, then pump it back into the reactor and turn on the freeze plug fan. Even Homer Simpson couldn’t screw that up. For five years, the reactor practically ran itself. They used to joke that the biggest problem they had was finding something to do.

Passive safety isn’t just built into the LFTR; it’s built into the actual fuel itself. The genius of liquid fuel is that the stuff won’t even work unless it’s held within the confined space of a reactor. In a Uranium reactor, the solid fuel rods keep radiating heat even when the control rods are dropped. The cooling system never rests. But when a LFTR shuts down, the fuel shuts down and sleeps like a rock.

Because of the constant and absolutely critical need for cooling, all Uranium reactors are located near a large body of water. It’s a tragedy that some were installed near the seashore, in the most earthquake-prone nation in the world, the very country that coined the word tsunami. But when you’re a small, crowded island nation hungry for carbon-free energy, you don’t have much of a choice…

Until now. Because LFTRs are air-cooled. That changes everything as well. Because that means they can be installed anywhere. They can even be placed in underground vaults to ward off an attack or a natural disaster. If a vault is near the ocean, a tsunami would roll right over it, like a truck over a manhole cover.

PROLIFERATION: Any rogue nation can build a 1940s-style graphite pile reactor and make the Plutonium for a bomb. That’s what North Korea did. Or they can use centrifuges to purify Uranium for a bomb. That’s probably what Iran is doing. Or, with a lot of expense and difficulty, they can convert a Uranium power reactor into a Plutonium breeder. The genie has been out of the bottle for over sixty years.

LFTRs convert Thorium into Uranium-233, an incredibly nasty substance. It’s an efficient, hot-burning reactor fuel, but it’s a very problematic weapons material. By contrast, U-235 and Pu-239 are very well behaved substances, and can be easily worked with in the lab or the factory. Out of the tens of thousands of nuclear weapons that were ever produced, the U.S. military built and tested only one U-233 “ device.” It was a partial fizzle, and we promptly abandoned the idea.

Even though LFTRs and LFTR fuel will be “denatured” to prevent weapons production, a rogue nation could possibly get around the fix and start a U-233 bomb program. But they’d have to start from scratch. There’s a wealth of information about U-235 and U-239 weapon design, and several experienced scientists could probably be recruited. But making a U-233 bomb is a lost art.

So, yes, in theory, you could make a bomb with a LFTR. But the development of a workable device would be an expensive and painstaking affair. Even though LFTRs won’t be “bomb-proof” per se, Uranium and Plutonium technology is very well known, thoroughly proven, and fully developed. So why reinvent The Bomb.

One last point: Nuclear weapons are not dependent on nuclear power. Even if every commercial power reactor in the world were taken out of service, that still wouldn’t stop the bad guys from pursuing nuclear weapons. North Korea developed the bomb without generating a single watt of nuclear power.

COST: The cost of a nuclear power plant is largely determined by four elements: The reactor itself; the structure that contains it; the inspection process; and the lawsuits that are piled on the project.

This last element adds an enormous amount of time and money to the endeavor, which raises utility rates and turns off investors and insurance firms and voters. So a rational comparison can only be made with the first two elements – the cost of the reactor and the cost of the containment structure.

The inspection process varies, depending on which reactor technology is used, and a Uranium reactor’s custom-made high-pressure systems require a bewildering thicket of inspections, tests, and reports. You’d think they were trying to go to the moon.


But LFTRs are an entirely different technology. In fact, it’s a lot more like high-temperature plumbing than nuclear physics. And because molten salt sheds heat quite easily, an elaborate cooling system isn’t even needed. A simple radiator will suffice.

Since LFTRs don’t operate under pressure, high-strength valves and fittings and high-pressure pipes aren’t needed, either. Off-the-shelf parts will do. Back-up generators, emergency cooling systems, control rod mechanisms, spent fuel storage pools, the crane for replacing fuel rods, the reactor pressure vessel, the airtight containment dome – all of these pricey items and more are eliminated.

For various reasons, every Uranium power reactor in America was designed and built from scratch, which significantly added to their build time as well as their cost. The plans alone would often exceed $100 Million in today’s dollars.

But LFTRs will be small and standardized, allowing them to be mass-produced in factories and shipped by rail. Their low-pressure components will be much easier to assemble, allowing for faster and simplified inspection. LFTRs will be modular, so a power plant will be able to grow along with the city it serves. All these factors and more will combine to produce a trickle-down effect, greatly reducing the complexity, cost, size, and build time of each project.

The current estimate for 1-gigawatt Thorium power plant is somewhere in the neighborhood of $2 Billion. That makes Thorium competitive with coal.

CONCLUSION: Liquid fuel is the killer app of nuclear power. It’s a whole new ball game. In fact, LFTRs could even replace the furnaces of our existing fossil fuel power plants, including coal. (Don’t get me started about coal…) LFTRs will provide carbon-free power wherever it’s needed, 24/7/365.

We’ve already mined enough fuel for over 400 years. They’ll be mass-produced right here in America, providing plenty of good jobs, and they’ll get us off of foreign oil and domestic natural gas, and even King Coal, by providing us with all the safe, clean energy we need.

Will they work as promised? Let’s build one and see. Power to the Planet!

Mike Conley Los Angeles p.s.

One more thing: Last fall, a delegation from China visited Oak Ridge National Labs. When they returned home, they announced that they would be embarking on an aggressive Molten Salt Reactor program, and would be patenting everything they can think of along the way. The Chinese are eating our lunch again, and using our own damn recipe. If this isn’t a Sputnik Moment, then I don’t know what is.

[I recall he did improvise a few words at the end in regard to building.the LFTR: Let us build one even if we make total fools of our selves as if to say “What if we’re right?”]



“THE THORIUM PARADIGM” soon to be a one-hour documentary

Executive Producer: James Blakeley III


Producer: Marina Martins


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Why Blue Ribbon Commission Report Will Be a Terminator Moment

I am rather concerned about the Blue Ribbon Commission on America’s Nuclear Energy Future. In the first Terminator movie the future of the world is dependent on an advancement in robotic technology and it causes the survivors of near annihilation from robot forces to travel back in time to prevent the fateful moment from happening. I can’t say enough about how important the results of the commission will be. A lot of weight is on their shoulders.

The polls that test support for nuclear are better than previous years but the recent Fukushima incident has caused the antinuclear people to apply more pressure.  What will be the fateful moment and what announcement would be so important to the future survival of the planet? It may be the report as a whole that makes a difference and how heavily it weighs in favor of Thorium Molten Salt Reactors and in favor of a push for regulatory reform. My whole two years as a pronuclear blogger feels put on hold in anticipation of their report.

Just like the US government seems blind to their overspending and misplaced rhetoric the nuclear industry will possibly lose their chance to save the planet from drastic climate change and perhaps the point of no return if the BRC does not do their job. If they are somehow motivated by corporate forces or desire for personal gain the outcome could be very serious. If they submit to pressure because of the history behind the closing of Yucca Mountain or the Fukushima incident it would be tragic.

It’s true that China has started their pursuit of the TFMSR which will be their version of a TMSR or LFTR. There is no guaranty they will succeed.

So BRC members please seriously consider the benefits and potential of this very promising technology which has been ignored for far too long.

Read the plan laid out by Kirk Sorensen and his fellow pro LFTR community.


Below is from the DOE website

March 2, 2010
Blue Ribbon Commission on America’s Nuclear Future Charter

The Secretary of Energy, acting at the direction of the President, is establishing the Commission to conduct a comprehensive review of policies for managing the back end of the nuclear fuel cycle, including all alternatives for the storage, processing, and disposal of civilian and defense used nuclear fuel, high-level waste, and materials derived from nuclear activities.  Specifically, the Commission will provide advice, evaluate alternatives, and make recommendations for a new plan to address these issues, including:

  1. Evaluation of existing fuel cycle technologies and R&D programs. Criteria for evaluation should include cost, safety, resource utilization and sustainability, and the promotion of nuclear nonproliferation and counter-terrorism goals.
  2. Options for safe storage of used nuclear fuel while final disposition pathways are selected and deployed;
  3. Options for permanent disposal of used fuel and/or high-level nuclear waste, including deep geological disposal;
  4. Options to make legal and commercial arrangements for the management of used nuclear fuel and nuclear waste in a manner that takes the current and potential full fuel cycles into account;
  5. Options for decision-making processes for management and disposal that are flexible, adaptive, and responsive;
  6. Options to ensure that decisions on management of used nuclear fuel and nuclear waste are open and transparent, with broad participation;
  7. The possible need for additional legislation or amendments to existing laws, including the Nuclear Waste Policy Act of 1982, as amended; and
  8. Any such additional matters as the Secretary determines to be appropriate for consideration.

Review the Advisory Committee Charter (pdf – 56kb)


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Thorium Molten Salt Reactor covered in Wall Street Journal

The Wall Street Journal wrote this on Thorium MARCH 19, 2011

Does a Different Nuclear Power Lie Ahead? By MATT RIDLEY
Might the Fukushima accident eventually create a chance for the nuclear industry to “reboot”? In recent years some have begun to argue that solid-fuel uranium reactors like the ones in Japan are an outdated technology that deserves to peter out and be replaced by an entirely different kind of nuclear energy that will be both safer and cheaper…

The attention brought by the Fukushima Daiichi nuclear plant break down has had unexpected attention brought to the Thorium Molten Salt Reactor which by the way has no need for water or containment and cannot melt down and will not radiate the worst nuclear isotopes.

There was a time when the Americans chose a path based on the perceived need to compete with the Russians for military supremacy. Nuclear weapons needed Plutonium. The method at the time was to breed Plutonium in a reactor. But Thorium Molten Salt Reactors could not produce Plutonium. This was viewed as a negative and became shelved.

Fifty years later, the worst nuclear breakdown since Chernobyl in 1986 has turned turned out to be relatively minor and the 50 remaining nuclear reactors in Japan remain safe. The different circumstances are so obvious. For instance human error was responsible for the Chernobyl accident. A natural disaster of such an unexpected strength that has not been experienced by Japan in modern history caused the disruption of 4 reactor units at the same plant in Fukushima Daiichi. The safety record for nuclear power plants has been unsurpassed by any other power facility or other industry.

The antinuclear movement has unwittingly helped the progress of nuclear energy. Articles such as these will now become more common over the next few months. The reality is that people are asking why has there been so little innovation over the last 30 years? Can reactors be made safer?

One of the main inventors of the Thorium Molten Salt Reactor, Alvin Weinberg, knew that they were superior to the solid fueled reactors and pushed for their acceptance. He eventually lost his job for making too much noise about it when the politics of the time were more about arms than climate change. Weinberg was ahead of his time. He also designed the Light Water Reactor, currently the most popular reactors, which he himself turned against.

Now considered a fourth generation technology the Thorium Molten Salt Reactor shows the most promise as a nuclear energy design precisely because they solve the problems that made the older nuclear power plant designs unpopular.

New Posts

Wind Turbines Cancelled in Ontario

Some say it’s an election year and McGuinty is going after the votes

Read the Toronto Star article by Martin Regg Cohn: Ontario reverses its spin on offshore wind

Advocates education LFTR New Posts nuclear nuclear plants thorium

Wired gets the China news on TMSR – LFTR before anyone else

Congratulations to Richard Martin for publishing a very important story. Actually Kirk Sorensen on EnergyFromThorium website and forum alerted us advocates and that must have included Richard.

China Takes Lead in Race for Clean Nuclear Power (Wired Magazine article)

The idea that US journalists and politicians have not learned about Thorium Molten Salt Reactors
is shocking and Jason Correia commented on the
news from China on Kirk Sorensen’s post:

I agree about *nobody up high enough knows* but seriously, ANYONE who might spend 30 minutes reading up on nuclear energy matters on the internet would probably stumble upon LFTR. And the fact that talk and buzz about LFTR never seemed to take off in those upper circles means these people have their heads buried in the sand and ought to be ashamed of themselves for their pitiful lack of intellectual curiosity.

Richard Martin is the 4th person I’ve seen mention the “Sputnik moment” that was also mentioned in Obama’s state of the union speech. It looks like China could, and France should have, inspired a “Sputnik moment” but the sleepers and self-interested members of society don’t seem to care.

The idea that this technology has resurfaced and could have remained buried in electronic digital files without being published and what’s worse without being taught in the universities and colleges is a tragedy. The genius of Alvin Weinberg and his colleagues came up with this technology over 50 years ago and the concept goes back to the 1940’s.

You regular readers will know exactly what I’m raving about. If you don’t then it’s time you checked out more of this website. I post regularly on Thorium MSR and LFTR.

Here are some other news outlets that covered the story:

  1. China enters race to develop nuclear energy from thorium (The Guardian – UK)
  2. China bets on thorium (The Register – UK)
  3. Nuclear power’s great leap forward (The Spectator – AU)
  4. Thorium ‘SA’s best-kept energy secret’
    SA has abundance of metal which could be used for greenhouse gas-free electricity generation
    (Business Day – ZA)
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Thorium MSR in China

Kirk Sorensen’s EFT page: Thorium Molten Salt Reactor (TMSR) is now being developed in China

and here is Charles Barton’s Post China starts LFTR Development Project

I’m sure Kirk Sorensen and Charles Barton had mixed emotions when they learned that China was building a TMSR. Details of the design are not available. For newcomers, this is a big deal because the LFTR is a TMSR. TMSR is a more general term.
So it’s great that somebody recognizes this technology as promising. It’s sad that the US, the place that gave birth to the first TMSR, has not revived the research to commercialize them. Alvin Weinberg must be turning in his grave.

New Posts

For Sale. Old Nuclear Plant Needs Dusting Off and Refurbishing

See Rod Adams latest post at

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What's Critical to the UK's ADSR Subcritical Reactor

The success of the Accelerator Driven Subcritical Reactor (ADSR)
will depend on the progress of their Accelerator Programme

First in order to understand the significance of why the ADSR is so attractive in theory is that it can run without Uranium or Plutonium as a startup fuel. That’s where the word “subcritical” comes in. From my initial observations it appears to be very different from a molten salt reactor. I will leave it to other more qualified bloggers to comment.

It’s going to be an interesting year for accelerator technology. Some are hoping for fusion!. But the ADSR needs less ambitious results but still challenging. They need a steady high energy, high current proton energy beam.

One principal limiting technology is that of the proton accelerator driver (Appendix I):

  • Cyclotrons can deliver appropriate continuous currents in the mA range, but cannot deliver sufficiently high proton energies.
  • Synchrotrons can deliver appropriate proton energies, but only at lower, pulsed currents.
  • Linear accelerators can deliver both the required currents and energies but are too large and expensive to be considered as a feasible commercial proposition.

Perhaps more significantly, no existing accelerator technology can meet the stringent reliability demands of a fully functioning ADSR power system. All accelerators are subject to numerous and frequent “trips” or loss of beam for periods extending from milliseconds to seconds, often many times an hour. As the spallation neutrons produced by the proton driver are responsible for the giga-Watt thermal power within the core, repeated loss of beam, even over such short periods, results in rapid thermal cycling and therefore intolerable thermal stress on the ADSR core sub- and super-structure.
It is significant that particle accelerators of a power appropriate for deployment as ADSR drivers (5-10MW) are at the forefront of accelerator technology and are generally developed individually for specific particle or nuclear physics experiments, or as drivers for major scientific facilities such as the planned European Spallation Source (5MW) and the recently commissioned Spallation Neutron Source (1.5MW) in the United States. Moreover, accelerator reliability on the scale demand by ADSR deployment remains a key performance issue and must be explored through appropriate R&D programmes.
The principal challenge of ADSR technology is thus to develop an appropriately powerful and sufficiently reliable accelerator.  Fortunately the UK is able to draw upon its internationally recognised expertise in accelerator design and innovation, and is therefore well placed to meet this challenge.



Seems like quite a challenge but it does raise an interesting question. If the LFTR needs a fissile fuel source to kick start the thorium cycle why can’t it use an accelerator beam? Maybe one of the followers can help with that question.

Here’s the proposed plan for their own portable (my word choice) accelerator system

A phased accelerator development programme: AESIR The principal objective of the five year AESIR (Accelerator Energy Systems with Inbuilt Reliability) R&D programme is to design, build and demonstrate a robust and reliable prototype accelerator system which will be suitable for mass production and commercialisation as an ADSR proton driver. The AESIR programme must therefore, on the one hand, be coherent and focussed, whilst on the other undertake the task of comprehensively evaluating the suitability of all potential advanced accelerator architectures and components.

… Read more on pg. 24 (pdf)

  • Quick Facts: [Thorium Element 90 in periodic table] [Burns up fuel much more efficiently than traditional reactors] [leaves barely any waste behind] [3 x more abundant than uranium] [MSRs run at high temp in liquid molten mixture of fluoride - heat useful for purifying water] [looks like blue water] [no pressure needed] [much safer because of passive safety] [Less expensive to build because it is smaller and easier to build with no pressurized containment needed] [can run without water therefore good for dry and remote locations][molten salt is very stable]

    See This Book Reviewed Here!!!