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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.

Jamie Coble

The nuclear power industry has the opportunity for significant advancements in the coming years, driven by the digital integration of instrumentation and controls (I&C), machine learning (ML), artificial intelligence (AI), and optimized operations and maintenance (O&M) technologies. These developments are the enabling technologies that can ensure the efficiency, safety, and reliability of our future fleet of nuclear power plants, propelling the industry toward a more sustainable and intelligent future.

I&C plays a vital role in monitoring and controlling various aspects of nuclear power plants. Traditional I&C systems have relied on hardwired control circuits, but modern advancements are shifting towards digital I&C systems, also known as digital control systems (DCS). These systems offer enhanced flexibility, scalability, and reliability. They utilize advanced sensors, data acquisition systems, and distributed control algorithms to enable real-time monitoring, fault detection, and control optimization.

“It is critical after the Hamaoka Nuclear Power Station restart that we reduce our cost and increase our capacity factor while becoming more economically competitive.” Ichiro Ihara, chief nuclear officer of Chubu Electric Power, made this observation recently when the Electric Power Research Institute visited the Japanese nuclear power plant for a strategy development session for plant modernization. EPRI’s team of five specialists spent four days at Hamaoka to investigate the feasibility of potential improvements—the third step of the EPRI modernization strategy planning process. It was a trip six months in the making—and the first time EPRI has applied its nuclear plant modernization process outside the United States.

When Ken Petersen is asked what he sees as the biggest challenges facing nuclear today and in the future, he immediately turns the question around. The 69th president of the American Nuclear Society prefers to focus on the positives of nuclear power instead of dwelling on the biggest challenges facing nuclear’s future prospects. That’s because there’s a lot to celebrate within the nuclear community—especially recently.

Most everything is trending up—from advanced technologies such as SMRs and microreactors to the promise of fusion energy to new ways of creating medical isotopes to progress in space exploration. “There’s huge momentum for nuclear right now,” Petersen said. “We're getting support from the environmentalist community and from legislation. I see it as a huge opportunity for us to continue to grow. It’s an exciting time. And it’s not just the U.S. It’s worldwide, too.”

The education and training of the nuclear power plant workforce is advancing in ways that are increasingly based on scientific knowledge about how the brain works. At the Beaver Valley nuclear power plant in Shippingport, Pa., instructional technologist and certified nuclear instructor Annaliese B. Piraino is applying the principles of educational psychology and neuroscience to the instructional practices.

The plant, which Texas-based Vistra Corporation acquired recently from Energy Harbor, consists of two Westinghouse pressurized water reactors, each with a production capacity just over 930 MWe. The operators along with the maintenance and technical staff at Beaver Valley are beginning to show the benefits of the new neuroscience-based instructional approaches to training that are being implemented by Piraino and the Beaver Valley training department.

Like many researchers, I long ago recognized the significance of debates about open access (OA) publishing. However, I did not become too deeply involved, knowing that I alone could not directly influence any outcomes.

Recently, two things changed

The first was the memo from the White House Office of Science and Technology Policy (OSTP)—commonly referred to as the Nelson memo—issued in August last year. In it, grant recipients are guided to provide immediate public access to research papers and data resulting from federally funded research. The second was my election as president of the American Nuclear Society. During my term from June 16, 2022, through June 15, 2023, I faced very concrete decisions that led to the recent launch of ANS's latest publishing venture, Nuclear Science and Technology Open Research (NSTOR).

Ten years ago this month, on June 7, 2013, Southern California Edison (SCE) communicated the decision to permanently shutter the San Onofre Nuclear Generating Station (SONGS). The decision set in motion the decommissioning of a plant that had provided steady baseload power for the region since 1968 during a period of tremendous growth in the western United States. In the end, issues presented by the planned replacement steam generators that were intended to support future plant operations proved too large of a hurdle, and the plant was forced to retire.

When people think of the deployment of advanced nuclear reactors in the United States, they might imagine something far into the future, with countless steps between concept and reality. But those steps are becoming strides, and the finish line is rapidly drawing closer.

Andrew Paterson

Having worked at the U.S. Department of Energy for a decade (1997–2007) and across the energy sector on the Environmental Business International board for 30 years, I have witnessed firsthand the widely shared opinion that the “next big thing” in nuclear will be small modular reactors for urban centers and to provide both heat and power for a variety of energy-intensive sectors. To meet the decarbonization demands of these urban centers, the current energy landscape is pushing many countries away from a “renewables-only” strategy. For example, the German Energiewende (or “energy turnaround”) formally started around 2000 under then chancellor Gerhard Schroeder to phase out nuclear toward mostly renewables (with natural gas backup imported from Russia). As demonstrated by the 2022 gas supply shock and price spikes, Germany created its own nightmare: They now suffer the highest energy prices in Europe, have an unstable grid, and are forced to use more coal.

Officially established on November 15, 2021, with the signing of the $1.2 trillion Infrastructure Investment and Jobs Act—aka the Bipartisan Infrastructure Law, or BIL—the Department of Energy’s Civil Nuclear Credit Program was designed to give owners/operators of commercial U.S. reactors the opportunity to apply for certification and competitively bid on credits to help support the continued operation of economically troubled units. Finally, the federal government, and not just certain farsighted state governments, would recognize nuclear energy for its important grid reliability and decarbonization attributes.

Not everyone in the nuclear industry is familiar with a series of 105 historic wall charts displaying detailed illustrations of nuclear reactors and their internal components, but Ronald A. Knief is. Knief, a retired professor of chemical and nuclear engineering at the University of New Mexico and former principal engineer at Sandia National Laboratories, has spent decades collecting these educational items, which were originally published as foldout inserts in Nuclear Engineering International magazine from the 1950s through early 2000s.

Serving as the world’s first scalable nuclear power plant, Shippingport Atomic Power Station led the way for today’s nuclear generation fleet. Shippingport was centrally located roughly 25 miles from Pittsburgh, Pa., to provide electrical generation for many end-users. Shippingport also served as an experimental reactor that allowed engineers and designers the ability to test different core designs, and as such, the site housed additional testing equipment otherwise not commonly seen. The primary goal of Shippingport was always to generate electricity; however, its ability to function as an experimental reactor served utilities in further development of scalable nuclear generation.