1.   The most urgent task, the report says, is to remove spent reactor fuel and store it in sealed containers on land.

2.   Later, he raised public alarms over nuclear waste left in the Arctic by submarine accidents and haphazard disposal of spent reactor cores.

3.   Most of the rest of the plutonium is spent reactor fuel and other non-weapons-grade plutonium.

4.   Other material at Hanford, such as spent reactor fuel and potentially explosive liquid wastes, are considered more hazardous.

5.   REPROCESSING means chopping up spent reactor fuel rods and chemically separating the plutonium, uranium and other products left over from splitting uranium.

6.   Such a device would use conventional explosives to detonate radiological materials, such as spent reactor fuel rods, and spread radiation over a wide area.

7.   The factory was designed to take in spent reactor fuel, chop it up and dissolve it in acid.

8.   The practice of recovering it from spent reactor fuel was banned by President Jimmy Carter as a proliferation risk.

9.   The plutonium is contained in the spent reactor fuel that is kept in a cooling pond near the reactor.

10.   Ultimately, the explosion issue could have practical consequences as the nation seeks to dispose of growing stocks of plutonium found in spent reactor fuel and scrapped nuclear warheads.