The standard nuclear fuel cycle in the US is "once-through": uranium fuel is used once, then stored as waste. But this discards over 95% of the potential energy remaining in the spent fuel. US nuclear waste recycling technology (reprocessing) can separate usable materials (plutonium, uranium, minor actinides) from fission products, reducing the volume and long-term toxicity of high-level waste (HLW). The recycled materials can be fabricated into new fuel for advanced (fast) reactors or mixed-oxide (MOX) fuel for current reactors. While the US currently does not recycle commercial spent fuel (policy and economics), research continues on advanced "proliferation-resistant" techniques, and demonstration projects exist at Idaho National Laboratory and elsewhere.

The broader US Nuclear Waste Management Market is projected to grow from $895.08 million in 2025 to $1.06 billion by 2035, at a CAGR of 1.69%. Recycling technologies are not yet a major market segment, but they hold long-term potential to transform waste management. This article explores the science, status, and future of nuclear waste recycling.

The "Once-Through" Fuel Cycle vs. Recycling

Recycling is not cheap, but it reduces long-term waste management burden.

Conventional Recycling: PUREX and MOX

PUREX (Plutonium and Uranium Recovery by Extraction):

• Spent fuel is dissolved in nitric acid.

• Organic solvent (tributyl phosphate) extracts plutonium and uranium.

• Separate streams of pure U and Pu (and optionally Np, Am, Cm) are produced.

• Fission products remain in the raffinate (liquid HLW), which is vitrified (glass logs).

MOX (Mixed Oxide Fuel):

• The recovered plutonium is mixed with depleted uranium to form MOX fuel.

• MOX fuel can be used in existing light-water reactors (partially loading).

• Each ton of MOX replaces about one ton of enriched uranium fuel.

Where it's used:

• France: Orano (formerly Areva) operates La Hague reprocessing plant; MOX fuel used in many reactors.

• Japan: Rokkasho plant (reprocessing); MOX fuel used.

• UK (Sellafield), Russia (RT-1), India (Kalpakkam).

The US (MOX facility at Savannah River) was under construction to dispose of weapons plutonium, but was abandoned in 2018 (cost overruns).

Advanced Recycling: Pyroprocessing (Electrorefining)

Pyroprocessing (electrorefining) is a "non-aqueous" (molten salt) method better suited for metal fuels and fast reactors.

Process:

1. Chop spent metal fuel (from fast reactor) into small pieces.

2. Submerge in molten salt (e.g., LiCl-KCl) with current. Uranium and other actinides deposit on a solid cathode (recovered).

3. Fission products and cladding remain in salt (which is then processed as waste).

Advantages:

• Compact, no liquid waste (salt-based).

• Proliferation-resistant: product is mixture of actinides (not pure Pu).

• Suitable for fast reactor fuel.

• Can separate minor actinides (neptunium, americium, curium) for burning.

Disadvantages:

• Requires metal fuel (not oxide, which is standard for LWRs).

• Immature (pilot scale; Idaho National Lab).

• Waste salt form is not yet permanent.

Status: Integrated Waste Treatment Unit (IWTU) at INL for sodium-bonded spent fuel from EBR-II. Not commercial.

US Nuclear Waste Recycling Technology: Current Research

The PRISM (Power Reactor Innovative Small Modular) concept couples a fast reactor with on-site pyroprocessing, recycling its own fuel multiple times.

Benefits of Recycling for Waste Management

A repository needed for once-through HLW must isolate waste for >100,000 years. With recycling (burning actinides), required isolation drops to 1,000-2,000 years (but still needs permanent disposal).

Challenges to Recycling in the US

The Nuclear Waste Policy Act (1982) allowed but did not mandate recycling. No commercial facility has been built.

Case Study: France – The Model for Recycling

• Reprocessing: La Hague plant treats 1,100 tons of spent fuel per year (capacity). Uranium and plutonium recovered.

• MOX fuel: Fabricated at Melox plant, used in 20+ reactors (partial core).

• Waste: Vitrified HLW stored temporarily (waiting for long-term repository Cigéo, under development).

• Volume reduction: Spent fuel volume reduced by factor of 5; toxicity reduced by factor of 10.

• Cost: Included in French waste management fees.

The US could adopt a similar strategy, but would need political consensus and investment.

The Role of US Nuclear Waste Transportation Cask in Recycling

Recycling would require shipping spent fuel to a central reprocessing plant. This requires certified US nuclear waste transportation cask (Type B or C) and secure logistics. The same casks would return recycled fuel (MOX or new fuel) to reactors.

Conclusion

US nuclear waste recycling technology has the potential to dramatically reduce the volume, toxicity, and long-term storage requirements for high-level waste. While the US has not yet committed to commercial recycling, research continues on advanced methods (pyroprocessing, UREX+). France, Japan, Russia, and the UK have demonstrated that recycling is technically feasible. If the US ever decides to close the nuclear fuel cycle, recycling will be an essential component. For now, the US Nuclear Waste Management Market is focused on storage and disposal, but recycling could become a future growth area as advanced reactors are deployed.

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