Formula Quantity [Energy] Law and Legal Definition
According to 10 CFR 73.2 [Title 10 – Energy; Chapter I -- Nuclear Regulatory Commission; Part 73 -- Physical Protection of Plants and Materials; General Provisions], the term formula quantity means “strategic special nuclear material in any combination in a quantity of 5,000 grams or more computed by the formula, grams = (grams contained U-235) + 2.5 (grams U-233 + grams plutonium). This class of material is sometimes referred to as a Category I quantity of material.”
