Research & Applications

Fusion is riding a surge of attention that began in December 2022 when researchers at Lawrence Livermore National Laboratory’s National Ignition Facility achieved fusion ignition. The organizers of Fusion Energy Week—a group called the U.S. Fusion Outreach Team—on the other hand, trace fusion development back 100 years to the doctoral research of Cecilia Payne-Gaposchkin, who discovered that stars, including our Sun, are mostly made of hydrogen and helium, which in turn led to the understanding that those elements are the “fuel” of potential fusion energy systems on Earth. In recognition of Payne-Gaposchkin’s birthday—May 10—the U.S. Fusion Outreach Team plans to hold a “grassroots celebration of fusion energy” May 6–10, 2024, and annually during the second week of May.

The United States is now closer than it has been in over five decades to launching the first nuclear thermal rocket into space, thanks to DRACO—the Demonstration Rocket for Agile Cislunar Orbit.

The Department of Energy’s Isotope Program (DOE IP) announced last week that it would end its “active standby” capability for strontium-82 production about two decades after beginning production of the isotope for cardiac diagnostic imaging. The DOE IP is celebrating commercialization of the Sr-82 supply chain as “a success story for both industry and the DOE IP.” Now that the Sr-82 market is commercially viable, the DOE IP and its National Isotope Development Center can “reassign those dedicated radioisotope production capacities to other mission needs”—including Sr-89.

In early 2006, a start-up company launched a small rocket from a tiny island in the Pacific. It exploded, showering the island with debris. A year later, a second launch attempt sent a rocket to space but failed to make orbit, burning up in the atmosphere. Another year brought a third attempt—and a third failure. The following month, in September 2008, the company used the last of its funds to launch a fourth rocket. It reached orbit, making history as the first privately funded liquid-fueled rocket to do so.

Zap Energy announced April 23 that it has reached 1-3 keV plasma electron temperatures—roughly the equivalent of 11 to 37 million degrees Celsius—using its sheared-flow-stabilized Z-pinch approach to fusion. Reaching temperatures above that of the sun’s core (which is 10 million degrees Celsius temperature) is just one hurdle required before any fusion confinement concept can realistically pursue net gain and fusion energy.

Scientists at Argonne National Laboratory have partnered with Washington state–based Energy Northwest to look at alternative ways to cool nuclear reactors as climate change impacts relied-upon water sources.

Sean Doherty

The most important thing the nuclear community can do to support space nuclear applications is the same thing we must focus on for terrestrial nuclear science: developing the trust of the American public.

Americans are widely supportive of NASA, and space has long captivated our imaginations. Recently, the publicity surrounding the new U.S. Space Force and the popularity of commercial rocket launches have drawn the public eye skyward. We don’t need to convince people that space is important and exciting, but we do have a long way to go in promoting nuclear power to the public.

Framatome and Korea Hydro & Nuclear Power (KHNP) have announced the signing of a memorandum of understanding to explore the possibility of producing the medical isotope lutetium-177 at KHNP’s Wolsong nuclear power plant in South Korea. The companies also will investigate the feasibility of using the plant to support Korean production of medical radioisotopes in the future.

During a state visit to the White House by Japanese prime minister Fumio Kishida on April 10, the Department of Energy announced that U.S. and Japanese agencies had cooperated to remove all high-enriched uranium (HEU) from the Japan Materials Testing Reactor Critical Assembly (JMTRC) of the Japan Atomic Energy Agency (JAEA) two years ahead of schedule.

Imagine what our world would be like today without the benefits of electric energy. Think of the inventions and technologies that never would have been. Think of a world without power grids and the electricity that makes them run. Without this power, we’d find it difficult to maintain our industrial and manufacturing bases or enable advancements in the fields of medicine, communications, and computing.

Now consider the moon, our closest celestial neighbor about which we still know so little, waiting for modern-day explorers in spacesuits to unveil its secrets. Lunar exploration and a future lunar economy require reliable, long-lasting, clean sources of power. Nuclear fission answers that call. When assessing the application of nuclear power in space, three Ps should be considered: the present, the potential, and the partnerships.

Researchers at the Department of Energy’s Princeton Plasma Physics Laboratory are using a stellarator they designed and built using permanent rare-earth magnets and a 3D-printed shell to help test new fusion power concepts. MUSE—the first stellarator built at PPPL in 50 years—took one year to construct and generated its first plasma in February 2023. The work that went into its design has already inspired a stellarator power plant concept being developed by a commercial spin-off, Thea Energy.

Once used for applications in medicine, industry, and research, many countries now have legacy radium-226 sources, according to the International Atomic Energy Agency. With the support of the IAEA’s technical cooperation program, these disused sealed radioactive sources are being recovered, and countries are improving national capacities for their long-term management, including their potential reuse and recycling.

Ken Petersen
president@ans.org

Nuclear has been on a good roll lately and it is getting better. The 2022 Inflation Reduction Act (IRA) provides a nuclear power production tax credit. This has stopped the early retirement of deregulated units. The IRA also provides a benefit for the clean production of hydrogen. Many utilities have committed to a net-zero goal by 2050. Duke and other utilities have plans to transition coal plants to nuclear with small modular reactors.

And now, nuclear has a new supporter—tech companies.

The big U.S. utility companies (like Exelon, Duke, Dominion, Southern, and Entergy) are all projecting growth in electricity demand—primarily in the commercial sector but some residential growth is also expected. Commercial growth is being driven by new factories (thank you, IRA and CHIPS, that is, the Creating Helpful Incentives to Produce Semiconductors and Science Act). It is also being driven by data centers.

The U.S. Department of Energy is constructing the Electron-Ion Collider (EIC) at Brookhaven National Laboratory to explore the boundaries of nuclear physics—both for the sake of science and to support diverse applications, including in nuclear medicine, radiation safety, and nuclear energy. The project, already supported by international collaborators in 40 countries, just secured a significant commitment from the United Kingdom.

The Korea Atomic Energy Research Institute has developed a high-density uranium silicide fuel designed to replace high-enriched uranium in research reactors. Recent irradiation tests appear to be successful, KAERI reports, which means the fuel could be commercialized to continue a key global nuclear nonproliferation effort—converting research reactors to run on low-enriched uranium fuel.

The Department of Energy and the Gateway for Accelerated Innovation in Nuclear (GAIN) on March 19 announced the second round of fiscal year 2024 voucher awards to three companies: Element Factory, Kanata America, and Oklo.

Researchers from the University of Rochester in New York and the University of California–San Diego have published a paper in Physical Review Letters describing a previously unknown class of plasma oscillations. In “Space-Time Structured Plasma Waves,” the researchers “demonstrate that electrostatic wave packets structured with space-time correlations can have properties that are independent of the plasma conditions,” such as “density, temperature, ionization state, or details of the distribution functions.” This finding is technologically relevant, the authors note, because “electrostatic waves play a critical role in nearly every branch of plasma physics from fusion to advanced accelerators, to astro, solar, and ionospheric physics.”

Staff and researchers at Penn State’s Radiation Science and Engineering Center (RSEC) will work this year to install a small angle neutron scattering (SANS) device and become the first and only U.S. university research reactor to host SANS capability. The $9.8 million device, donated by Helmholtz Zentrum Berlin (HZB) in Germany, will help researchers determine the structure of organic materials such as polymers, complex fluids, and biomolecules.

The Department of Energy’s Office of Clean Energy Demonstrations issued a final environmental assessment (EA) and finding of no significant impact in February for a cost-shared X-energy project to construct and operate a helium test facility (HTF) in Oak Ridge, Tenn. According to the EA, construction would begin in early 2024 and take X-energy and its contracted partner, Kinectrics, about one year to complete. the facility would then operate for six years, with the possibility of extensions for up to an additional 20 years, to test equipment for a demonstration of X-energy’s high-temperature, gas-cooled reactor technology and also to “serve the reactor community at large as the technology continues to develop and is adopted around the world.”

A team of engineers, physicists, and data scientists from Princeton University and the Princeton Plasma Physics Laboratory (PPPL) have used artificial intelligence (AI) to predict—and then avoid—the formation of a specific type of plasma instability in magnetic confinement fusion tokamaks. The researchers built and trained a model using past experimental data from operations at the DIII-D National Fusion Facility in San Diego, Calif., before proving through real-time experiments that their model could forecast so-called tearing mode instabilities up to 300 milliseconds in advance—enough time for an AI controller to adjust operating parameters and avoid a tear in the plasma that could potentially end the fusion reaction.