Today’s #ThrowbackThursday post looks at the initial debate surrounding the conversion of research reactor fuel from high-enriched uranium to low-enriched uranium. An article published in the April 1984 issue of Nuclear News (available to all ANS members), titled “NRC studies HEU-to-LEU fuel conversion issue,” was written by the ANS Washington editor John Graham, and brings up several items of interest.

The story: Graham introduces the readers to the growing security concerns around HEU and notes that the issue has its roots in the nonproliferation concerns from the Carter administration that forced the domestic nuclear industry to abandon certain projects—the subject of a #TBT post a couple of weeks ago.

The Department of Energy is funding an independent review of NuScale Power’s safety analysis report (SAR), to be conducted by Ukraine’s State Scientific and Technical Center for Nuclear and Radiation Safety (SSTC NRS), the Portland, Ore.–based small modular reactor developer announced on November 18.

“Any party interested in deploying an SMR in Ukraine will benefit from this independent review,” NuScale said. “This review will demonstrate the viability, value, and international interest in utilizing NuScale’s SMR technology to produce clean, reliable, and affordable energy.”

The Department of Energy is funding an independent review of NuScale Power’s safety analysis report (SAR), to be conducted by Ukraine’s State Scientific and Technical Center for Nuclear and Radiation Safety (SSTC NRS), the Portland, Ore.–based small modular reactor developer announced on November 18.

Exelon Generation has received a grant from the Department of Energy to explore the potential benefits of on-site hydrogen production and has chosen its Nine Mile Point nuclear power plant as the demonstration site, the company announced on Wednesday. (In 2019, Exelon received a conditional commitment from the DOE to co-fund a hydrogen electrolyzer demonstration at a nuclear plant.) Located in Scriba, N.Y., Nine Mile Point consists of two boiling water reactors—the 620-MWe Unit 1 and the 1,287-MWe Unit 2.

Seventy-five years ago today, on July 1, 1946, the first U.S. national laboratory was chartered with the singular mission of developing the peaceful uses of nuclear energy. Now, the Department of Energy’s Argonne National Laboratory is one of the nation’s largest science laboratories, working on diverse challenges in energy, climate, science, medicine, and national security.

New Brunswick Premier Blaine Higgs announces C$20 million in funding for the ARC-100 small modular reactor. Photo: ARC Canada

The Canadian province of New Brunswick has awarded C$20 million (about $15.7 million) to ARC Clean Energy Canada (ARC Canada) to support the development of the proposed ARC-100 advanced small modular reactor. The premier of New Brunswick, Blaine Higgs, announced the award during his state of the province address on February 10.

ARC Canada, headquartered in Saint John, New Brunswick, is a subsidiary of U.S.-based ARC Clean Energy, formerly known as Advanced Reactor Concepts. The company’s ARC-100 is a 100-MWe integrated sodium-cooled fast reactor that uses a metallic uranium alloy fuel. Based on Argonne National Laboratory’s Experimental Breeder Reactor-II, the reactor is designed to operate for 20-plus years without refueling.

In October 2019, ARC Canada announced that it had completed the first phase of the Canadian Nuclear Safety Commission’s (CNSC) vendor design review. (While the phase-one assessment provides detailed feedback regarding a vendor’s understanding of the CNSC’s requirements for a nuclear power plant in Canada, it does not certify the design or license the reactor.)

Image: Purdue University/Maria Okuniewski

A team of researchers led by Purdue University has used X-ray imaging conducted at Argonne National Laboratory’s Advanced Photon Source to obtain a three-dimensional view of the interior of an irradiated nuclear fuel sample. The use of synchrotron micro-computed tomography could lead to more accurate modeling of fuel behavior and more efficient nuclear fuel designs, according to the researchers.

You may have read the abbreviated version of this article in the November 2020 issue of Nuclear News. Now here's the full article—enjoy!

I have enjoyed a long and stimulating career in applied nuclear physics—specifically nuclear reactor physics, nuclear fusion plasma physics, and nuclear fission and fusion reactor design—which has enabled me to know and interact with many of the scientists and engineers who have brought the field of nuclear energy forward over the past half-century. In this time I have had the fortune to interact with and contribute (directly and indirectly) to the education of many of the people who will carry the field forward over the next half-century.

The MiFi-DC as portrayed in a video released by Argonne.

Electrifying the nation’s trucking industry could reduce consumption of fossil-based diesel fuel, but it would also pose new challenges. A cross-country 18-wheel truck needs five to 10 times more electricity than an electric car to recharge its battery. Where will that electricity come from?

A team of engineers at Argonne National Laboratory has designed a microreactor called the MiFi-DC (for MicroFission Direct Current) that they say could be mass-produced and installed at highway rest stops to power a future fleet of electric 18-wheelers.

Nuclear News reached out to the MiFi-DC team to learn more. The team, led by Derek Kultgen, a principal engineer at Argonne who also leads the lab’s Mechanisms Engineering Test Loop, responded to questions by email. While they emphasized that much more needs to be done before the MiFi-DC could become a fixture at rest stops across the country, the information the team shared sheds some light on the process of designing a tiny reactor for a specific purpose.

The National Academies of Sciences, Engineering, and Medicine (NAS) has begun a new webinar series, with the first entry titled “What’s new in low-dose radiation.” The July 22 event kicked off the Gilbert W. Beebe Webinar Series—an extension of the Beebe Symposium, which was established in 2002 to honor the scientific achievements of the late Gilbert Beebe, NAS staff member and designer/implementer of epidemiologic studies of populations exposed to the atomic bombings of Hiroshima and Nagasaki as well as the Chernobyl accident.

The Ghana Research Reactor-1, located in Accra, Ghana, was converted from HEU fuel to LEU in 2017. Photo: Argonne National Laboratory

In late 2018, Nigeria’s sole operating nuclear research reactor, NIRR-1, switched to a safer uranium fuel. Coming just 18 months on the heels of a celebrated conversion in Ghana, the NIRR-1 reboot passed without much fanfare. However, the switch marked an important global milestone: NIRR-1 was the last of Africa’s 11 operating research reactors to run on high-enriched uranium fuel.

The 40-year effort to make research reactors safer and more secure by replacing HEU fuel with low-enriched uranium is marked by a succession of quiet but immeasurably significant milestones like these. Before Africa, a team of engineers from many organizations, including the U.S. Department of Energy’s Argonne National Laboratory, concluded its conversion work in South America and Australia. Worldwide, 71 reactors in nearly 40 countries have undergone conversions to LEU, defined as less than 20 percent uranium-235. Another 31 research reactors have been permanently shut down.