Nobody, nobody in the original reports said anything about "weapons grade plutonium". That came from a silly-*ss "analysis" on Stratfor (on another thread here somewhere, which I debunked).
I wonder if it keeps being mentioned to make the real report seem silly when the final evaluation finds banned material the UN didn't know about, but no weapons grade plutonium.
(They also didn't discover "Saddam's nuclear weapons", just some unexpected rooms at a nuclear facility. Talk about leaping to conclusions.)
"After a quick inspection at what military authorities call the 'Yellowcake Facility' a few hundred meters offsite, the Army specialists told the Marines they suspect Al-Tuwaitha harbors weapons-grade plutonium."