Tag: Molten salt Thorium Reactor

Why Thorium? 37. China has approved the commissioning of a thorium-based molten salt nuclear reactor. The Cat is out of the bag.

The reactor, known as “Thorium Molten Salt Reactor – Liquid Fuel 1 (TMSR-LF1)“, began construction in 2018 in Wuwei City, Gansu Province, by the Hongshagan Industrial Cluster.

The TMSR-LF1 reactor is an experimental liquid fluorinated thorium reactor using a LiF-BeF2 -ZrF4 -UF4 [+ThF4] fuel salt mixture and a LiF-BeF2 coolant salt. It runs on a combination of thorium (about 50 kg) and uranium-235, enriched to 19.75%, and can operate at a maximum temperature of 650°C for up to 10 years. The liquid fuel design is based on the molten salt reactor experiment conducted in the 1960s by the Oak Ridge National Laboratory in Tennessee, USA.

With this authorization, China has become the first country to take a significant step towards harnessing the power of thorium for clean, large-scale energy generation in over 50 years.

“From Reuters in Dec 2013: “China has enlisted a storied partner for its thorium push: Oak Ridge National Laboratory. The U.S. government institute produced the plutonium used for the Manhattan Project and laid important groundwork for the commercial and military use of nuclear power.

The Tennessee lab, as it happens, helped pioneer thorium reactors. The Pentagon and the energy industry later sidelined this technology in favor of uranium, (it didn’t produce Plutonium 239.) The Chinese are now enthusiastically tapping that know-how, in an example of how the rising Asian superpower is scouring the world for all sorts of technology needed to catch up to America in a broad array of scientific fields.

Thorium’s chief allure is that it is a potentially far safer fuel for civilian power plants than is uranium. But the element also has possible military applications as an energy source in naval vessels. A U.S. congressman unsuccessfully sought to push the Pentagon to embrace the technology in 2009, and British naval officers are recommending a design for a thorium-fueled ship.

In a further twist, despite the mounting strategic rivalry with China, there has been little or no protest in the United States over Oak Ridge’s nuclear-energy cooperation with China.

“The U.S. government seems to welcome Chinese scientists into Department of Energy labs with open arms,” says physicist and thorium advocate Robert Hargraves. He and other experts note that most of the U.S. intellectual property related to thorium is already in the public domain. At a time when the U.S. government is spending very little on advanced reactor research, they believe China’s experiments may yield a breakthrough that provides an alternative to the massive consumption of fossil fuels.

The technology’s immediate appeal for China, both Chinese and American scientists say, is that thorium reactors have the potential to be much more efficient, safer and cleaner than most in service today.

The Chinese plan to cool their experimental reactors with molten salts. This is sharply different from the pressurized water-cooling systems used in most uranium-fueled nuclear plants. The risks of explosions and meltdowns are lower, proponents say.

“If a thorium, molten-salt reactor can be successfully developed, it will remove all fears about nuclear energy,” says Fang Jinqing, a retired nuclear researcher at the China Institute of Atomic Energy. “The technology works in theory, and it may have the potential to reshape the nuclear power landscape, but there are a lot of technical challenges.”

Other advocates agree on thorium’s peaceful promise. Republican Senator Orrin Hatch and Senate Majority Leader Harry Reid, a Democrat, introduced legislation in 2010 calling on the U.S. government to share its thorium expertise.” The bill failed, leaving Oak ridge labs to look for other sponsors. That was in 2013.

What China has done is to turn the nuclear clock back to the mid-1960s, when Oak Ridge successfully operated a reactor with fuel derived from thorium and cooled with molten salts. The lab also produced detailed plans for a commercial-scale power plant, which was then shared with the Chinese.

If successful, TMSR-LF1 would open the door to developing and constructing a demonstration facility with an output of 373 MWt by 2030 and could lead to the construction of a TMSR fuel salt batch pyroprocessing demonstration facility, which would enable the utilization of the thorium-uranium cycle in the early 2040s.

Top view of a thorium molten salt reactor

What did I mean by “The Cat is out of the bag”? Only that molten salt Thorium reactors are breeder reactors that can produce more U233 than is used, and if U 233 is stolen, it can be used to make nuclear bombs, like Plutonium 239 is used for nuclear bombs. Nobody has done it yet, and it is more difficult to do than with Plutonium, but it is possible. However Uranium 233 contains 0.02% Uranium 232, which is used as a tracer in chemical processes, so U 233 is easy to trace.

The race is on, there is no stopping it now!

The case for Thorium 13. Virtually no spent fuel problem, very little on site storage or transport.

 Virtually no spent fuel problem, very little on site storage or transport. I have been following the events at Fukushima Nuclear Power plants disaster with great interest. How ironic that one of the greatest problems was with the spent fuel, not with the inability to shut down the working units. The spent fuel issue is the real Achilles’ heel of the Nuclear Power Industry. The cost of reprocessing and storing spent reactor fuel will burden us for centuries after the reactors themselves have been decommissioned after their useful life. Molten Salt Thorium nuclear power works differently from  conventional Uranium fueled Reactors as  the fissile fuel gets generated in the breeding process itself and nearly all fuel gets consumed as it is generated. When the process shuts down, that is it. Only the radioactivity that is en route so to say will have to be accounted for, not everything generated thus far in the process. The difference is about ten thousand to one in the size of the problem. It is high time to rebuild and expand our Nuclear power generation by switching to Thorium.

50 year anniversary since the first moon landing. A Limerick.

https://lenbilen.com/wp-content/uploads/2012/12/wb.jpg

I remember it like yesterday. We sat up late in the evening of July 20 1969 and watched the first landing on the moon, in real-time and transmitted over all 3 networks. Later President Nixon commented: “This is the greatest week in the history of the world since Creation.” Be that as it may, it was watched by about 500 million people world-wide and the future looked bright. Look at us since then:

Fifty years since “a small step for man.”

It seemed we lost sight of the plan.

Now it’s back to the Moon

with the Gateway, and soon

for with Thorium power, we can.

The ambition is to build a space colony on the moon, have a space station, the “Gateway”, and from there launch unmanned and finally manned Mars missions. A very ambitious program. The only way it is possible by utilizing molten salt Thorium nuclear reactors on the moon to cope with the 14 day nights on the moon. This 10 min video tells it well.

The need to develop Thorium based Nuclear Energy as the major electric energy supply. 14. No need for evacuation zones, can be placed near urban areas.

No need for evacuation zones, can be placed near urban areas. Molten Salt Thorium reactors operate at atmospheric pressure and have a very high negative temperature coefficient, so there is no risk for a boil-over. They are easily made earthquake-safe and no pressure vessel is needed. This will greatly simplify the approval process, no need for elaborate evacuation plans have to be developed. Since the Three Mile Island accident there was a thirty year gap in approvals for new nuclear plants. The “not in my backyard ” mentality reigned supreme, and delay and denial was the rule of the years. But the lawyers still got their share, leading to escalating cost for new nuclear power. In the early days of nuclear power France took the approach of building some of their nuclear plants near the Belgian and German border, so they only had to develop half of an  evacuation plan, leaving the other half to their understanding neighbors. It also leads to placing the nuclear plants where there is the least resistance, not where they are needed the most, adding to the strain on the electric grid.

The need to develop Thorium based Nuclear Energy as the major electric energy supply. 12. Virtually no spent fuel problem, very little on site storage or transport.

 Virtually no spent fuel problem, very little on site storage or transport. I am following the events at Fukushima Nuclear Power plants with great interest. How ironic that the greatest risk is with the spent fuel, not with the inability to shut down the working units. The spent fuel issue is the real Achilles’ heel of the Nuclear Power Industry. Molten Salt Thorium nuclear power works differently from  conventional Uranium as  the fissile fuel gets generated in the breeding process itself and nearly all fuel gets consumed as it is generated. When the process shuts down, that is it. Only the radioactivity that is en route so to say will have to be accounted for, not everything generated thus far in the process. The difference is about one to ten thousand in the size of the problem. It is high time to rebuild and expand our Nuclear power generation by switching to Thorium.

The need to develop Thorium based Nuclear Energy as the major electric energy supply. 9. Molten Salt Thorium Reactors cannot have a meltdown, the fuel is already molten.

With Molten Salt nuclear Reactors there is no risk for a meltdown, the fuel is already molten, and that is a safe design. The fissile fuel in a Thorium reactor is U-233 in the form of UraniumFluoride (UF4) salt which also contains Lithium and Beryllium. In its molten form it has a very low vapor pressure. The salt flows easily through the heat exchangers and the separators. The salt is very toxic, but it is completely sealed. Being a fluid, it is constantly mixed for optimum efficiency. The reactor will never have to be shut down for refueling, it is a continuous flow process. Uranium-235 Nuclear reactors on the other hand have to be shut down for refueling and rebalancing of the fuel rods a little more often than once every two years. The average shutdown is 35 days, or about 5% of the time. Then comes the major problem of safely and securely transporting and reprocessing the spent fuel.