Los Alamos National Laboratory Director Charles McMillan has halted a number of activities at PF-4, the lab’s main plutonium facility, pending a thorough verification of safety procedures. All areas of PF-4 involved in processing nuclear materials and production have been placed on hold.

Projects affected will include plutonium work for the nuclear weapons program, work on plutonium power sources for NASA satellites and Rovers and plutonium-related work securing nuclear materials around the world.

The director’s decision was based on reviews at PF-4 and findings from recent assessments, according to an all-hands memo distributed to employees.

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