Features

For many of us, the toys of our childhood leave indelible marks on our consciousness, affecting our long-term perceptions and attitudes about certain things. Hot Wheels may inspire a lifelong fascination with fast, flashy automobiles, while Barbies might shape ideas about beauty and self-­image. For the generation who grew up during the Atomic Age—the post–World War II era from roughly the mid-1940s to the early 1960s—the toys, games, and entertainment of their childhoods might have included things like atomic pistols, atomic trains, rings with tiny amounts of radioactive elements, and comic books, puzzles, and music about nuclear weapons.

The last time a human entered the Pile Fuel Storage Pond at the Sellafield nuclear site in Cumbria, England, was in 1958, when records show a maintenance operator and health physics monitor carried out a dive into the newly constructed pond to repair a broken winch. At least that was true until December 2022, when Josh Everett, a diver from the U.K. specialist nuclear diving team Underwater Construction Corporation (UCC) UK Ltd., became the first person in more than 60 years to work in one of the most unique workplaces in the world.

Last year, the U.S. Geological Survey (USGS) released its 2022 list of 50 minerals that are essential to the function of our society, especially the economy and national security. Whether it’s indium for LCD screens and aircraft wind shielding, cobalt for iPhones, uranium for nuclear reactors and munitions, rare earth elements for wind turbine magnets, lithium for rechargeable batteries, or tantalum for electronic components, if we do not have an ample supply, bad things will happen.

W. A. “Art” Wharton III

Multiple market forces on nuclear fuel have arisen seemingly at the same time since the Russian war in Ukraine started. Accident tolerant fuels (ATF), lead test rods, and lead test assemblies have had their first shot in real operating conditions, in recent cycles. But the popularity of their so-called accident tolerance has nothing to do with accidents, since any practical nuclear professional knows that the safety of nuclear energy is already higher than that of any other electricity generation source. The popularity comes down to fuel performance. Are we on the cusp of a revolution in nuclear fuel performance under the guise of accident tolerance?

Per- and polyfluoroalkyl substances (PFAS), an anthropogenic class of several thousand chemicals made for use in products such as nonstick cookware, water-, grease-, and stain-resistant materials, surfactants, and fire suppression foams [1], are emerging as a complicating factor in nuclear decommissioning. These chemicals, which have been manufactured globally, including in the United States, have gained regulatory and public attention due to their persistence and ubiquity in the environment, ability to be detected at low parts-per-trillion levels, and health-based standards set at levels hundreds to thousands of times lower than more classic contaminants such as polychlorinated biphenyls (PCBs).

This year’s American Nuclear Society Annual Meeting was filled with great content, some of which was covered in the August issue of Nuclear News (beginning on p. 22). One of the meeting’s executive sessions, “Bringing Nuclear History Forward,” focused on advanced reactor (AR) history and was well attended. The United States—along with many countries around the world—is turning to nuclear to combat climate change. Part of this is funding new and innovative companies to create first-of-a-kind nuclear reactors to provide abundant and clean power. Looking at the current designs of interest to the community brings up interesting comparisons to the test and experimental reactors of the past. Test reactors like the Experimental Breeder Reactor-II (EBR-II), the Fast Flux Test Facility (FFTF), Peach Bottom, Fort St. Vrain, Germany’s AVR, and others now are more important than ever in providing insight, data, and operational lessons learned to develop the next generation of reactors.

The Advanced Research Projects Agency–Energy (ARPA-E), a branch of the Department of Energy, is tasked with driving the research and development of cutting-edge energy technologies. The agency’s core emphasis is on mitigating emissions, increasing energy efficiency, reducing imports, ensuring energy systems resiliency, and offering transformative solutions for the management of radioactive waste and spent nuclear fuel (SNF). Its mission is instrumental in ensuring the United States retains its technological superiority in the design and implementation of new energy technologies. Efforts in SNF research also benefit prior investments in ARPA-E’s MEITNER (Modeling-Enhanced Innovations Trailblazing Nuclear Energy Reinvigoration) and GEMINA (Generating Electricity Managed by Intelligent Nuclear Assets) programs, which seek to substantially decrease the capital and operational expenditures associated with advanced reactors (ARs).

Craig Piercy
cpiercy@ans.org

Hi friends, I hope you had a good summer. Like many of you, I took a break from my summer vacation to watch Christopher Nolan’s Oppenheimer. I’m an unabashed Nolan fan—Inception and Interstellar rank among my top 10 favorite movies—but I’ll admit that Oppenheimer required more time for me to digest.

The film itself is first-rate: powered by a taut screenplay, its stripped-down elemental cinematography largely validates the director’s decision not to use any computer-generated imagery (although a couple of quick CGI scenes from the K-25 enrichment facility or the X-10 graphite reactor would have been really cool). The result is a historically faithful, largely accurate celebration of the brilliant minds that enabled one of the most daring engineering feats of all time.

In the last few weeks of 2021, when it was clear that the Russian invasion of Ukraine had put this country’s uranium fuel supply in jeopardy, nuclear energy advocates lobbied hard to attach provisions to various pieces of “must-pass” legislation—such as the National Defense Appropriations Act (NDAA), the Ukraine Supplemental Appropriations Act, the Infrastructure Investment and Jobs Act, and the CHIPS and Science Act—to have the government get the ball rolling on new domestic uranium fuel production capacity. Four times they thought they had succeeded, that Congress was going to allocate enough money to start the United States on the road to a secure supply of reactor fuel, including the higher-enriched fuel needed for advanced reactors.

The article below was originally published in the March 2021 issue of Nuclear News. (Also included in that issue is a great review article from Lake Barrett outlining the current status of the decontamination and decommissioning going on at Fukushima .) That month marked 10 years since the Tōhoku earthquake and tsunami devastated Japan and crippled the Fukushima plant. The words that follow remain timely, since various news outlets continue to report on the dangers of Fukushima's wastewater without providing context to the Japanese plan to discharge it.

On April 10, the University of Missouri (MU) took its first formal step toward building NextGen MURR when school officials issued the request for qualifications for the project. The RFQ is a solicitation for interested companies to offer the design, engineering, licensing, environmental, and developmental services that are needed for NextGen MURR, planned to be larger and more capable than the school’s existing University of Missouri Research Reactor (MURR)—which itself has been the most powerful research reactor and most intense neutron source on any U.S. campus since it began operating in 1966.

Advanced reactors are promising energy systems that can enable the world to transition to a more sustainable energy matrix. These concepts are potentially more fuel efficient and safer, compared with previous generations of nuclear reactors. Many designs, like high-­temperature gas reactors (HTGRs) and molten salt fast reactors (MSFRs), target high outlet temperatures, allowing for their operation in processes where high heating is required, such as for hydrogen production and desalination.

Nuclear research reactors throughout the world enable crucial scientific progress that benefit many sectors, health care and the environment among them. But some of those reactors need an important adjustment: a conversion from using high-enriched uranium fuel to using low-enriched uranium fuel.

As global concerns about climate change and energy sustainability intensify, the need for cleaner and more efficient energy sources is more critical than ever. Nuclear power consistently emerges as an important part of the solution, driving the development of innovative technologies. While numerous fission technologies were built and proven in the early days of nuclear energy, times and regulations have changed. Between the 1950s and mid-1970s, Idaho National Laboratory built 52 reactors—then paused for five decades. Can this nation return to the frontier once again, embarking on new fission technologies? With a mature regulatory environment and increasing public support, how quickly can a new non–light water system be deployed in modern times?

In Big Bang nucleosynthesis (BBN), the deuterium-tritium (DT) fusion reaction ³H(d,n)⁴He, enhanced by the 3/2⁺ “Bretscher resonance,” is responsible for 99 percent of primordial helium-4. While this fact has been known for decades, it has not been widely appreciated. The importance of the resonant nature of the DT fusion reaction has been amplified by recent activities related to the production and use of terrestrial fusion, including the recent net-gain shot at the National Ignition Facility (NIF). Here, we aim to highlight the anthropic importance of the ⁴He-producing DT reaction that plays such a prominent role in models of nucleosynthetic processes occurring in the early universe. This primordial helium serves as a source for the subsequent creation of more than 25 percent of the carbon (¹²C) and other heavier elements that compose a substantial fraction of the human body. Further studies are required to determine a better characterization of the amount of ¹²C than this lower limit of 25 percent. Some scenarios of core stellar nucleosynthetic yield of ¹²C suggest that even higher percentages of carbon from primordial helium are possible.

Helling

Terry

The relatively young pedagogical field of mind, brain, and education (MBE) is being increasingly applied to training programs in the nuclear industry. Last month, this column highlighted how the MBE approach is being used at the Beaver Valley nuclear power plant in Shippingport, Pa. (“Neuroscience meets nuclear science at Beaver Valley,” NN, June 2023, p. 80). This month, the focus is on the MBE efforts of Pittsburgh-­based Westinghouse Electric Company, led by Westinghouse employees Pamela Terry, business and staff development lead, and Dave Helling, senior training advisor.

Helling was one of four panelists (along with Beaver Valley’s instructional technologist Annaliese Piraino) who participated in a discussion at the Conference on Nuclear Training and Education: A Biennial International Forum (CONTE 2023) earlier this year. There, he summarized his two conference presentations and discussed aspects of his company’s psychology-­ and neuroscience-­based approach to training and education.

I am lucky. I live near a nuclear power plant—arguably the best run and most beautiful power plant in the world. It’s comforting.

It’s comforting to see Columbia Generating Station’s clean white plume of pure steam rise into the air every time I leave my house. Every time I’m driving home. Every time it’s freezing outside. Every time it’s scorching hot.

Even the few times when it has gone quiet for refueling, the plant stands like a Norman castle protecting the region from energy poverty. It’s comforting.

Gas-cooled reactors have roots that reach way back to the development of early experimental reactors in the United States and Europe. In the United States, early experimental reactors at Oak Ridge and Brookhaven National Laboratories were air-cooled, as were early production reactors known as the “Windscale Piles” in the United Kingdom. Dragon, also located in the United Kingdon and operational from 1965 to 1976, used helium as the coolant and graphite as the moderator.

Human factors engineering and risk analysis are part of every instrumentation and control upgrade and new reactor plan—from design and licensing to implementation and operation—and applications continue to evolve.

As nuclear power plants in the United States and around the world go through license renewals to operate for up to 60 and 80 years and beyond, aging management of electrical cables takes center stage. Each nuclear power plant unit has thousands of miles of cables, many of which are critical to plant safety and reliability. The most important cables—those in safety systems or safety-related applications—are qualified according to industry standards and guidance documents for nuclear applications. These qualification methods use accelerated aging to simulate cable degradation under natural aging conditions and then subject the cable to a design-basis event simulation to establish the cable’s “qualified life.” This approach has worked well for the length of the initial plant license, but now, many cables are approaching or already are past their 40-year qualified lifespan. With license renewals allowing plants to operate beyond their original design life, the industry has undertaken a variety of research endeavors to help assess the condition of cables as they age and develop in situ testing techniques to verify that cables can continue to operate safely and reliably. For example, in 2022, we completed a multiyear project to develop aging acceptance criteria for a wide variety of condition monitoring techniques that can objectively assess the aged condition of cables while they remain installed in nuclear plants.