The advancement of technology, from electric cars to artificial intelligence (AI) data centers, has led to an increasing demand for electricity in our daily lives. Nuclear fusion, a process that involves merging atoms together to release heat for generating electricity, holds the potential to provide abundant energy with minimal environmental impact. However, the high cost associated with nuclear fusion is primarily due to the scarcity of one of its key fuels, tritium.
Researchers are now exploring innovative ways to utilize nuclear waste to produce tritium, offering a promising solution to this challenge.
Terence Tarnowsky, a physicist at Los Alamos National Laboratory (LANL), recently shared his findings at the fall meeting of the American Chemical Society (ACS Fall 2025), held from August 17 to 21. Tarnowsky’s research focuses on leveraging nuclear waste to generate commercial quantities of tritium, potentially revolutionizing the fusion energy sector.
Traditional nuclear power plants operate through nuclear fission, where uranium or plutonium atoms split to release energy and trigger a chain reaction. While this process is effective in producing energy, it also generates long-lasting nuclear waste that poses environmental risks.
In contrast, nuclear fusion power plants aim to harness energy by combining atomic nuclei, particularly deuterium and tritium isotopes, to create heavier elements. This fusion process, similar to how stars produce energy, offers a cleaner energy alternative with minimal radioactive byproducts.
While deuterium is widely available, the U.S. faces challenges in securing a stable supply of tritium. Tarnowsky highlights the current shortage of tritium in the U.S., emphasizing the critical need for domestic tritium production to meet energy demands.
Naturally occurring tritium is found in the upper atmosphere, with major commercial sources stemming from fission reactors in Canada. Tarnowsky notes that the global tritium inventory is limited, underscoring the importance of developing sustainable tritium production methods.
By utilizing the vast nuclear waste repositories in the U.S., which contain radioactive materials requiring safe storage, Tarnowsky proposes a novel approach to extract valuable tritium. This innovative concept not only addresses the tritium supply shortage but also presents a practical solution for repurposing nuclear waste for energy production.
He has conducted numerous computer simulations to assess the efficiency and production of potential tritium reactors. These simulated reactor designs utilize a particle accelerator to initiate atom-splitting reactions within nuclear waste. As the atoms split in the simulation, they release neutrons and eventually generate tritium through a series of nuclear transitions. The accelerator feature allows operators to control these reactions, making it a safer alternative to the chain reactions found in traditional nuclear power plants.
While the fundamental principles of this design are not new, advancements in technology could enhance its efficiency compared to when it was initially proposed in the 1990s and early 2000s. According to Tarnowsky, this theoretical system operating on 1 gigawatt of energy could potentially produce approximately 4.4 pounds (2 kilograms) of tritium annually, equivalent to the total yearly tritium output from all reactors in Canada.
One major advantage of Tarnowsky’s system is its tritium production efficiency. He anticipates that this design could generate over 10 times more tritium than a fusion reactor of the same thermal power.
Moving forward, Tarnowsky aims to determine the cost of tritium production once he obtains more precise calculations of the reactor’s efficiency. He plans to enhance his simulations to evaluate the design’s efficiency and safety more accurately, incorporating various engineering elements that have not been combined in this manner before. For instance, he intends to develop new code for a model that surrounds the nuclear waste with molten lithium salt, a proven design for reactors using uranium fuel that has primarily been used in scientific experiments.
The cooling properties of the salt offer a potential safety feature, making it challenging to extract the waste for weapon development. The ultimate objective is for the modeling to assist decision-makers in identifying the most promising simulation for future implementation.
Although these concepts may seem intricate, Tarnowsky views them as part of a strategy to leverage existing technology in cost reduction efforts. He emphasizes the significance of simplifying energy transitions whenever possible, stating, “Energy transitions are a costly business, and anytime you can make it easier, we should try.”
In conclusion, Tarnowsky’s innovative approach to tritium reactor design and simulation holds promise for enhancing tritium production efficiency and safety, potentially paving the way for significant advancements in the fusion energy sector. The ongoing research and development efforts aim to provide valuable insights for future decision-making in the field of nuclear energy.
