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An Energy Department investigation has alleviated fears that a significant amount of plutonium was missing from a national laboratory, but it also has heightened concerns about flaws in the system for controlling the U.S. stockpile of weapons materials.
A routine inventory in February at Los Alamos National Laboratory in New Mexico found a plutonium shortage estimated at 2.2 pounds, setting off a frantic national effort to locate the material. This week, the confidential investigation, whose results were leaked, concluded that statisticians at the lab had miscalculated the amount of plutonium at the facility and that none was actually missing.
