According to this article, the recently exploded reator number 3 at
Fukushima was using "mox" as a fuel.

QUOTE: "Last year, unit 3 began using some reprocessed fuel known as
"mox," a mixture of plutonium oxide and uranium oxide, produced from
recycled material from nuclear weapons as part of a program known as
"from megatons to megawatts." UNQUOTE

http://www.dispatch.com/live/content...g.html?sid=101


This raises the stakes substantially if the core has been breached.
Plutonium is poisonous as all hell in addition to its high
radioavtivity and incredibly long half life.
Dave