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Project Could Reduce Spent Nuclear Fuel

March 01, 2006

Hoping to reduce the nation’s growing inventory of stored spent nuclear fuel, a group of nuclear engineering faculty, scientists and students from Big Ten universities, the University of Chicago and the U.S. Department of Energy’s Argonne National Laboratory will develop innovative nuclear fuel cycles that will recycle and dispose of this high-level radioactive material.

The group will base its studies in the Center for Advanced Nuclear Fuel-Cycles (CANF), a new initiative housed at Argonne. Co-directors at Argonne and the University of Wisconsin-Madison will lead the center. The project is also intended to provide valuable educational experience for the next generation of scientists and engineers.

Nuclear fuel used in current reactors has enormous available energy. As the fuel is used to produce electricity, only a fraction of this available energy is actually consumed, generating a small quantity of high-level radioactive waste within the solid fuel.

Currently, most spent nuclear fuel is stored temporarily in secure, specially designed pools at commercial reactors around the country, or in leak-tight steel casks housed in above-ground concrete vaults. When space is full, the fuel could end up at a commercial temporary-storage facility in Utah, or perhaps at the proposed Yucca Mountain high-level waste repository.

But these storage options are short-term approaches to dealing with the back-end of the nuclear fuel cycle, says Michael Corradini, a UW-Madison professor of engineering physics and the center’s co-director. “We hope to develop a ‘sustainable’ fuel cycle-that is, an efficient, cost-effective way to reuse current spent nuclear fuel and minimize its byproducts,” he says. “Advanced nuclear fuel cycles can be recycled as a source of available energy as demand for uranium increases.”

A number of countries, including Japan and France, currently have programs to reprocess their spent nuclear fuel using a process known as PUREX (plutonium and uranium recovery by extraction). The CANF team will seek to improve upon these separation and recycling processes. “The major difference is that we are looking for ways to successfully extract specific radioactive species for separate uses and separate disposal,” says Prof. Corradini.

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