Displaying items by tag: nuclear energy

Oak Ridge National Laboratory

Demonstration reactor projects, alternative fuel among projects centered around Oak Ridge, an old-school nuclear town

Leo Williams is the editor of ORNL Review. UT-Battelle manages Oak Ridge National Laboratory for the Department of Energy’s Office of Science. The full interactive article is available here.

Offer your perspective on this article and the new rise of nuclear technology in East Tennessee by contacting Hellbender Press Editor Thomas Fraser at This email address is being protected from spambots. You need JavaScript enabled to view it..

OAK RIDGE — In fall 2020, California-based Kairos Power announced plans to build an advanced nuclear demonstration reactor within the site of the former K-25 uranium enrichment plant in Oak Ridge.

It was a good location for the company. The decommissioned K-25, now named Heritage Center Industrial Park, came with impressive infrastructure, including ample electricity from the Tennessee Valley Authority, abundant water from the nearby Clinch River and more than 11 miles of rail line connected directly to the Norfolk Southern system. Interstate 40 was less than five miles away.

Perhaps more importantly, the location gave Kairos’ scientists and engineers close access to an unmatched pool of nuclear expertise. ORNL, which helped start the nuclear age more than 80 years ago and remains at the forefront of nuclear research, is all of five miles away. The University of Tennessee, Knoxville, which hosts a prestigious nuclear engineering department dating back to 1957, is just 30 miles down the road.

And the federally owned TVA, which has operated nuclear power plants since 1974, is developing its own next-generation nuclear reactor about three miles away.

In particular, though, the company wanted to be near a national lab, according to its co-founder Mike Laufer.

“The big decision for us was where we were going to put the Hermes reactor,” he said.

“For that, we pretty quickly narrowed down that we had a strong preference to be in close proximity to a national laboratory, with capabilities that could augment our own infrastructure.”

Hermes will be a 35-megawatt molten salt-cooled reactor that uses a new kind of uranium fuel called TRISO — short for tristructural isotropic particle fuel. The billiard ball-sized TRISO pebbles will consist of uranium, carbon and oxygen particles surrounded by carbon- and ceramic-based materials designed to prevent the release of radioactive fission products. The reactor will not produce electricity; rather, it will demonstrate the company’s technology before Kairos moves on to building much larger commercial reactors.

Architect’s rendering of the Hermes Low-Power Demonstration Reactor facility under construction in Oak Ridge.  Kairos Power

The Tennessee Valley Authority’s Bob Deacy shows U.S. Department of Energy secretary Jennifer Granholm the site of a future nuclear reactor in Oak Ridge.  Ben Pounds/Tennessee Lookout

DOE chief: Little nuke plants posited to provide clean energy 

This story was originally published by Tennessee Lookout.

OAK RIDGE — U.S. Department of Energy Secretary Jennifer Granholm visited the site of a possible first-of-its-kind nuclear reactor for the Tennessee Valley Authority this week. 

The utility’s board authorized $200 million to explore building a reactor on the site last year after the Nuclear Regulatory Commission gave TVA an early site permit in 2019. 

This first-of-its-kind small modular reactor would be smaller than standard nuclear reactors and generate less power, but it could have other advantages. While typical nuclear power plants need to provide power at 100 percent of their capacity constantly, a small modular reactor can more easily increase or decrease the amount of power it provides to the overall grid. Melinda Hunter, TVA nuclear communication specialist explained that this flexibility can complement renewable plants elsewhere in the TVA grid.

“When the sun’s not shining, you can bring the power up,” she said, adding that during sunnier periods the small modular reactors can provide less power.

TVA CEO Jeff Lyash said the utility will likely start building its first reactor on the site in 2027 and finish by the early 2030s. TVA is looking to build four of these reactors on the site, but it’s not made a final decision on the first one yet. Each reactor would generate 300 megawatts. 

The Chornobyl Nuclear Plant in Ukraine is seen in 1986 after a fire devastated the plant and led to radiation emissions that spread across the European continent. United Nations

36 years after the Chornobyl crisis, Ukraine presents a test for nuclear reactor survivability

This story was originally published in The Revelator.

CHORNOBYL, UKRAINE — It took less than a minute after an unexpected power surge for one of the nuclear reactors at Chornobyl (Chernobyl in the Russian spelling) to explode on April 26, 1986, ripping the roof off and spewing dangerous toxins into the air.

The event, and emergency cleanup that followed, left 30 workers dead, thousands exposed to cancer-causing nuclear material and later death, and a legacy of radiation. Now, 36 years later and with war raging, Ukraine is desperate to prevent another nuclear disaster.

Nuclear reactors generate more than half of the country’s power. Ukraine is the first country with such a large and established nuclear energy program to experience war, according to the International Atomic Energy Agency.

Richard Lagdon is Professor of Practice in Nuclear Engineering at the University of Tennessee. He also is Engineering Manager, Systems Integration and Chief Engineer, Nuclear Operations & Safety with Bechtel National Inc. Reston, VA.
He will review the status of current projects for Natrium and VTR fast reactors, the challenges of advanced reactor licensing and how the development of the Nuclear Licensing Course NE486/586 at UT reckons with these challenges. 

He has forty years of progressive nuclear experience managing projects, developing technical policy, interfacing with stakeholders and developing long range plans. He is an accomplished nuclear professional, practiced in engineering, emergency operations, plant startups and conduct of operations while supporting operational goals.

From working as Shift Test Engineer for the reactors of the nuclear Navy to developing life cycle maintenance plans for aircraft carriers, Captain Lagdon’s broad range of assignments over 30 years in the Navy Reserves, earned him the Leo Bilger award for outstanding leadership. The civilian side of his career included a decade as Chief of Nuclear Safety in the U.S. Department of Energy, where he lead nuclear construction reviews for projects totaling more than $15 billion.

While some hope that nuclear energy will end the climate crisis others point out that it will be too expensive and take too long to scale up while climate disasters grow exponentially. What most can agree upon is that the reliable output of existing nuclear plants remains indispensable for the foreseeable future and that maintaining their safety is paramount.

The webinar organized by the Technical Society of Knoxville, which provides Professional Development Hour confirmation to attending professional engineers, is hosted by the Foundation for Global Sustainability (FGS).
FGS facilitates educational events to inform the public and foster better understanding of complex environmental, social and economic issues that impact the resilience of communities and the natural life support systems of planet Earth. Views and opinions expressed by event organizers and participants do not necessarily reflect the views of FGS. FGS neither endorses any product or service mentioned nor warrants for accuracy, completeness or usability of the information.

“Our intelligence and flexibility as a society will be tested as the financial and industrial giants all figure out what they’re going to do.”

The Tennessee Valley Authority intends to phase out its aging fleet of coal plants by 2035, potentially replacing the age-old carbon-rich power source with increased use of natural gas and refreshed, concentrated supplies of nuclear energy as the vast utility moves to drastically reduce its greenhouse gas emissions.

The plan emerged Wednesday, about a month after the Biden administration called on the U.S. power sector to eliminate pollutants linked to climate change by 2035.

The Tennessee Valley Authority is the largest public provider of electricity in the United States. It provides wholesale power to every major municipal provider in Tennessee, as well as other metropolitan areas and smaller utility districts and cooperatives within its seven-state service area.