Grant enables nuclear fuel search

Researchers headed by a California Davis University physics professor searching for more efficient fuels for nuclear reactors have received a grant of almost $1.2m (£730,000) from the US Department of Energy.

The team will use the money to develop computer models that will allow it to theoretically manipulate the fuels and investigate their behaviour.

Prof Sergey Savrasov will work with two colleagues at Rutgers University in New Jersey to address the shortcomings of uranium dioxide - the fuel most commonly used to generate nuclear energy.

As uranium dioxide is an insulator, it heats unevenly during the reactor cycle. During the cycle, as temperatures approach the material’s melting point around 4,900^oF, extreme heat differences within the bulk of the fuel cause it to crack and burn inefficiently.

To avoid this problem, scientists have been looking for fuels with good thermal conductivity.

‘You could use metallic fuels because they conduct heat very well,’ said Savrasov. ‘But you also have to have a fuel with a high melting temperature because you don’t want the material to melt. So what we are looking for are those materials that have better thermal conductivities and higher melting temperatures.’