Notre Dame Researchers Work to Improve Radioactive Waste Recycling : Research into Clusters of Uranium Nano-Molecules to Recycle Nuclear Weapon Waste

Researchers at the University of Notre Dame, Indiana, are developing a process to recycle radioactive waste from nuclear power plants to form clusters of uranium nano-molecules that could potentially be turned back into useable fuel.

The university explained that the United States’ current nuclear power process only uses about 1% of the total energy available from the fuel, resulting in radioactive waste that leaves a significant negative impact on the environment.

However, it said that several other countries, such as France, the UK and Russia recycle nuclear fuel by reprocessing the used fuel to recover more energy. The researchers thinking about problems surrounding nuclear materials and looking for solutions to reduce waste, decrease the cost of nuclear energy production, and increase efficiency and safety of the entire process.

Although not currently practiced in the United States, they said that the best-known way to fully utilise nuclear fuel is to recycle the waste produced in the fuel cycle.

“Even though it has been forty years since President Jimmy Carter outlawed nuclear fuel recycling, the reasons he cited - high cost and the proliferation of nuclear weapons - are still the main factors behind the country’s reasoning not to recycle nuclear waste as a fuel source,” explained Peter C. Burns, the Henry J. Massman Professor of Civil & Environmental Engineering & Earth Sciences and director of the Center for Sustainable Energy at Notre Dame (ND Energy).

“This is despite the fact that nuclear energy accounts for 20% of the United States electricity and has a low carbon footprint,” he added.

Burns and his research group have synthesised hundreds of compounds new to science over the past 20 years. His team has even developed a method that causes uranium — a naturally occurring element — to form clusters of uranium nano-molecules that could potentially be turned back into useable fuel.

How it Works

This process starts after a used fuel rod, which holds the uranium to produce nuclear energy, has been cooled under water for about 10 years. Once sufficiently cooled, the waste can be dissolved to form initial uranium nano-molecules, which are then filtered to purify the uranium. As a result of this research, new developments have been made in the use of filtration systems in the nuclear waste recycling process.

The goal of Burns’ research is to not only support the recycling of waste produced in the fuel cycle, but also find potential solutions for waste left over from nuclear weapon production.

As an example, the researchers explained that at the height of the United States nuclear defense program, Hanford, WA was a production site that separated 67 tonnes of plutonium. The resulting radioactive waste was stored in 177 tanks underground at the site, with tanks averaging a million gallons. Through the Hanford site’s cleanup effort, the most hazardous material will be moved to a repository where it will be re-buried underground.

“The legacies of nuclear weapons and nuclear power have to be dealt with by highly qualified engineers and scientists, especially when considering the national security, environmental, and ethical issues that nuclear materials present,” said Burns. “At Notre Dame, we are working on developing new materials that can be used in the nuclear waste recycling process and training our students to be the next generation of researchers who can tackle these concerns head on.”

ND Energy is a University research center intended to foster and grow research toward sustainable and aff energy and support energy-related education.

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