On Tuesday, the US Department of Energy (DOE) launched an application for interested parties to apply for access to a maximum of 19 metric tonnes — a little under 42,000 pounds — of weapons-grade plutonium, which has long been a key resource undergirding the US nuclear arsenal.

42,000 pounds of weapons grade plutonium...

Fat man was around 15lbs...

So this would be enough to make ~2,800 nuclear bombs of similar strength to put into context how much this is.