(A) Computational domain and material distribution used in the simulations. The domain is rotated so that the Opalinus Clay strata are vertical. (B) 3D contour plots of neutral uncharged tritiated water (left) and charged 36Cl− (right) solutes at 900 days. (C) Comparison of observed (symbols) and simulated (lines) borehole concentrations using the 3D model. (Image: Sarsenbayev et al.)
Researchers with the Massachusetts Institute of Technology, working with scientists from Lawrence Berkeley National Laboratory and the University of Orléans, have modeled radionuclide behavior in deep geologic formations, offering a tool for developing a defensible safety case for the underground disposal of radioactive waste.
Team members and the new closure welding system that seals canisters containing spent fuel. (Photo: DOE)
Teams from the Department of Energy’s Offices of Environmental Management and Nuclear Energy recently collaborated on the Road Ready Demonstration Project by testing new equipment to seal spent nuclear fuel into a safe and transportable system for future shipments out of Idaho.
The ETU 3.0 reactor vessel was lowered into position using construction cranes and mounted on a support structure attached to the building’s foundation. (Photo: Kairos Power)
A reactor vessel has been installed by Kairos Power for its third Engineering Test Unit (ETU 3.0) at the company’s campus in Oak Ridge, Tenn.
(Photo: Idaho National Laboratory)
Following the signing of a new agreement, Kiewit Nuclear Solutions, a subsidiary of Kiewit Corporation, is officially the lead constructor for Oklo’s first commercial Aurora powerhouse, which will be built at Idaho National Laboratory.
The president and government officials at the meeting. (Photo: EPA)
Representatives across all levels of Pennsylvania government convened at Carnegie Mellon University on July 15 with investors and key leaders in the energy community at the behest of Sen. Dave McCormick (R., Pa.).
A schematic diagram of the Shaft Seal Test Facility. (Image: NERS)
For 2,300 hours, the molten salt pump Shaft Seal Test Facility (SSTF) operated at the University of Michigan’s Thermal Hydraulics Laboratory, according to an article from UM. The large-scale experiment was designed to evaluate shaft seal performance in high-temperature pump systems. Fewer than 10 facilities worldwide have successfully operated fluoride or chloride salts for more than 100 hours using over 10 kilograms of material.
Honoring the achievements and legacy of the WWII generation of nuclear pioneers — and remembering all those affected by Trinity.

By Craig H. Piercy, CEO and Executive Director of the American Nuclear Society
Eighty years ago today, at exactly 5:29:45 a.m. local time* on July 16, 1945, the United States Army detonated the world’s first nuclear bomb in the Jornada del Muerto desert of southern New Mexico. The searing flash and thunderous shockwave marked the culmination of the Manhattan Project, a secret, three-year national effort to harness nuclear fission and hasten the end of the Second World War.
The Trinity Test, overseen by Manhattan Project director Major General Leslie Groves and Los Alamos Laboratory director Dr. J. Robert Oppenheimer, was the final act of that race to build the atomic bomb. Hoisted atop a 100-foot steel tower, the plutonium implosion device, known as the Gadget, unleashed a blast equal to 21,000 tons of TNT and temperatures hotter than the center of the sun.
From ten miles away, observers wearing darkened welder goggles looked on in stunned silence. “We knew the world would not be the same,” recalled Oppenheimer.