BOISE, Idaho (AP) -- To guard against terrorists storming a U.S. weapons lab and setting off a crude nuclear device, the Bush administration is considering consolidating much of the nation's plutonium and bomb-grade uranium at a few highly secure sites, including concrete bunkers in Idaho.

Currently, the material is scattered at 13 sites around the country.

Energy Secretary Samuel Bodman is expected to get an advisory board's report next month on the potential cost savings and security improvements from combining the hundreds of tons of weapons fuel.

The Energy Department and a federal agency that oversees the nation's nuclear stockpile have been discussing the idea for more than a year, after a series of security lapses during mock terrorist attacks at federal weapons labs.