Lightbridge’s primary fuel design incorporates uranium-zirconium metal fuel rods in the seed region and thorium-uranium oxide fuel rods in the blanket region. This fuel design offers enhanced proliferation resistance, significantly reduced volume (approx. 40% volume reduction), weight (70% weight reduction) and long-term radio-toxicity (90% reduction) of used fuel, and improved fuel cycle economics, particularly on the back-end. In some earlier technical publications, this fuel design was also referred to as Radkowsky Thorium Fuel or RTF.
