US Particle Accelerators Turn Nuclear Waste Into Electricity, Cut Radioactive Life By 99.7%

Source: Slashdot

Accelerator‑Driven Systems (ADS) for Nuclear Waste Transmutation

Researchers at the Thomas Jefferson National Accelerator Facility are advancing Accelerator‑Driven Systems (ADS) that use high‑energy proton beams to transmute long‑lived nuclear waste into shorter‑lived isotopes. The process also generates significant heat, which can be harnessed to produce additional electricity for the grid — as reported by Interesting Engineering.

The projects are supported by $8.17 million in grants from the Department of Energy’s NEWTON (Nuclear Energy Waste Transmutation Optimized Now) program.

How ADS Works

• A particle accelerator fires high‑energy protons at a target (e.g., liquid mercury).
• The proton impact triggers spallation, releasing a flood of neutrons.
• These neutrons interact with unwanted, long‑lived isotopes in nuclear waste, effectively “burning” the most hazardous components by transmuting them into shorter‑lived isotopes.
• While unprocessed fuel remains dangerous for ~100,000 years, ADS‑enabled partitioning and recycling can reduce that hazardous window to about 300 years.

For more background on ADS, see the World Nuclear Association overview.

Technical Hurdles: Efficiency and Power

Superconducting Cavity Cooling

Traditional accelerators rely on massive, expensive cryogenic systems to keep superconducting cavities at very low temperatures. Jefferson Lab is pursuing a cost‑effective alternative by coating the interior of pure niobium cavities with tin.

• Niobium‑tin (Nb₃Sn) cavities can operate at higher temperatures, allowing the use of standard commercial cooling units instead of custom large‑scale cryogenic plants.
• The team is also developing spoke cavities, a complex design aimed at achieving higher efficiency in neutron spallation.

Magnetron‑Based Power Source

The second major challenge is providing the 10 MW of power required for the accelerator beam. Researchers are adapting the magnetron—the same component that powers microwave ovens—to meet this demand.

• The magnetron’s output frequency must match the accelerator cavity precisely at 805 MHz.
• In collaboration with Stellant Systems, the team is prototyping advanced magnetrons that can be combined to reach the necessary high‑power thresholds while maintaining maximum efficiency.

Outlook

The NEWTON program aims to enable the recycling of the entire U.S. commercial nuclear fuel stockpile within the next 30 years, potentially transforming nuclear waste management and contributing additional clean electricity to the grid.