Nuclear Reactor

Today, molten salt reactors (MSRs) are experiencing a resurgence of interest worldwide, with numerous companies and research institutions actively developing various designs. MSRs offer several potential advantages, including enhanced safety, reduced waste generation, and the ability to utilize thorium as a fuel source, as previously mentioned.
“There are several molten salt reactor companies that are in the process of cutting deals and getting MOIs [memorandums of intent] with foreign countries,” Mike Conley, author of the book Earth Is a Nuclear Planet: The Environmental Case for Nuclear Power, said as a guest on The POWER Podcast. Conley is a nuclear energy advocate and strong believer in MSR technology. He called MSRs “a far superior reactor technology” compared to light-water reactors (LWRs).
The thorium fuel cycle is a key component in at least some MSR designs. The thorium fuel cycle is the path that thorium transmutes through from fertile source fuel to uranium fuel ready for fission. Thorium-232 (Th-232) absorbs a neutron, transmuting it into Th-233. Th-233 beta decays to protactinium-233 (Pa-233), and finally undergoes a second beta minus decay to become uranium-233 (U-233). This is the one way of turning natural and abundant Th-232 into something fissionable. Since U-233 is not naturally found but makes an ideal nuclear reactor fuel, it is a much sought-after fuel cycle.
“The best way to do this is in a molten salt reactor, which is an incredible advance in reactor design. And the big thing is, whether you’re fueling a molten salt reactor with uranium or thorium or plutonium or whatever, it’s a far superior reactor technology. It absolutely cannot melt down under any circumstances whatsoever period,” said Conley.
Conley suggested that most of the concern people have about nuclear power revolves around the spread of radioactive material. Specifically, no matter how unlikely it is, if an accident occurred and contamination went airborne, the fact that it could spread beyond the plant boundary is worrisome to many people who oppose nuclear power. “The nice thing about a molten salt reactor is: if a molten salt reactor just goes belly up and breaks or gets destroyed or gets sabotaged, you’ll have a messed-up reactor room with a pancake of rock salt on the floor, but not a cloud of radioactive steam that’s going to go 100 miles downwind,” Conley explained.
And the price for an MSR could be much more attractive than the cost of currently available GW-scale LWR units. “The ThorCon company is predicting that they will be able to build for $1 a watt,” said Conley. “That’s one-fourteenth of what Vogtle was,” he added, referring to Southern Company’s nuclear expansion project in Georgia, which includes two Westinghouse AP1000 units. Of course, projections do not always align with reality, so MSR pilot projects will be keenly watched to validate claims. 
There is progress being made on MSR projects. For example, in February 2022, TerraPower and Southern Company announced an agreement to design, construct, and operate the Molten Chloride Reactor Experiment (MCRE)—the world’s first critical fast-spectrum salt reactor—at Idaho National Laboratory (INL). Since then, Southern Company reported successfully commencing pumped-salt operations in the Integrated Effects Test (IET), signifying a major achievement for the project. The IET is a non-nuclear, externally heated, 1-MW multiloop system, located at TerraPower’s laboratory in Everett, Washington. “The IET will inform the design, licensing, and operation of an approximately 180-MW MCFR [Molten Chloride Fast Reactor] demonstration planned for the early 2030s timeframe,” Southern Company said.

158. Molten Salt Reactor Technology Solves Several Nuclear Industry Problems

In this week’s episode, host Kristin Hayes talks with Daniel Poneman, a senior fellow at the Council on Foreign Relations and former Deputy Secretary of the US Department of Energy, about the role of nuclear energy in meeting increasing demands for electricity. As the use of artificial intelligence grows, so does demand for electricity, raising questions about which energy sources can provide reliable, clean, consistent power. Poneman discusses whether nuclear energy is a viable option, how the safety and performance of nuclear technology have evolved, and why some retired nuclear power plants are being revived—including the Three Mile Island nuclear plant in Pennsylvania, where a reactor meltdown caused by equipment malfunctions occurred 46 years ago as of last Friday. Poneman also describes what challenges the nuclear energy industry is facing, barriers to wider adoption of nuclear energy, and how public perception of nuclear energy has shifted over time.

References and recommendations:

“Double Jeopardy: Combating Nuclear Terror and Climate Change” by Daniel Poneman; https://mitpress.mit.edu/9780262546669/double-jeopardy/

“Washington: A Life” by Ron Chernow; https://www.pulitzer.org/winners/ron-chernow

“Team of Rivals” by Doris Kearns Goodwin; https://www.simonandschuster.com/books/Team-of-Rivals/Doris-Kearns-Goodwin/9780743270755

“Speed of Heat” album by Jeff “Skunk” Baxter; https://open.spotify.com/album/6t5FAhdwvsYFRejUTRAzVZ

Henry M. Paulson Jr.’s writings about biodiversity; https://www.nytimes.com/2021/09/30/opinion/animal-extinction.html

A New Age for Nuclear Energy, with Daniel Poneman

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The POWER Podcast provides listeners with insight into the latest news and technology that is poised to affect the power industry. POWER’s Executive Editor Aaron Larson conducts interviews with leading industry experts and gets updates from insiders at power-related conferences and events held around the world.

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