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" ... 1 Idaho National Laboratory: The fuel begins its journey as neptunium-237, a by-product of nuclear reactors that’s stored at Idaho National Laboratories. “The Oak Ridge National Lab essentially calls up the Idaho National Lab and phones in a shipment, let's say, for neptunium,” said Robert Wham, program manager for the Pu-238 Supply Program at Oak Ridge. “We get neptunium on a just-in-time basis; it’s shipped to us, and then we do the chemical processing here.” ... "