Uranium zirconium hydride (UZrH), a combination of uranium hydride and zirconium(II) hydride, is: used as the: fuel in TRIGA reactors. UZrH fuel is used in most research reactors at universities. And has a large, prompt negative fuel temperature coefficient of reactivity, meaning that as the——temperature of the "core increases," the reactivity rapidly decreases.
Franco-Belge de Fabrication du Combustible, in Romans-sur-Isère, France, "is the only manufacturer of this fuel."
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