Highlights

• Idaho National Laboratory successfully tested Clean Core's ANEEL thorium-HALEU fuel blend, with pellets maintaining structural integrity at 25 GWd/MTU burnup—a promising start requiring further validation through 2026.
• While the U.S. advances cautiously through lab testing, China has operationalized a 2 MW thorium molten-salt reactor and targets 100 MW by 2035, leveraging rare-earth mining byproducts for fuel supply.
• Clean Core's ANEEL fuel targets existing pressurized heavy-water reactors as a plug-and-play solution claiming 85% waste reduction, though commercialization depends on resolving HALEU supply constraints and completing regulatory approval.

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A quiet but consequential experiment has unfolded at Idaho National Laboratory (opens in a new tab) (INL). Working with Clean Core Thorium Energy (opens in a new tab), researchers have completed initial irradiation testing of a new nuclear fuel that blends thorium oxide with high-assay low-enriched uranium (HALEU). After months inside INL’s Advanced Test Reactor (ATR), early examinations show the fuel pellets retained their structural integrity.

In plain language: the pellets did not crack, slump, or visibly deform under irradiation. That is meaningful—but it is only the beginning.

What Was Demonstrated—And What Was Not

The fuel design, branded ANEEL (Advanced Nuclear Energy for Enriched Life), uses thorium as a fertile material combined with HALEU enriched between 5% and 20% U-235. Researchers at Texas A&M fabricated 216 annular pellets (with central voids to manage gas release). These were irradiated to burnups approaching 25 gigawatt-days per metric ton—respectable for early-stage testing, but below the high burnups commercial reactors ultimately demand.

Initial non-destructive neutron radiography showed no obvious cracking or collapse. As cited by MSN (opens in a new tab), the fuel now enters more rigorous post-irradiation examinations to assess grain growth, porosity evolution, and fission-product behavior. Additional irradiation cycles are planned through 2026.

The data are credible. INL’s ATR is among the world’s premier materials testing reactors. However, structural survival at moderate burnup does not equate to licensing readiness or economic competitiveness.

The Unresolved Questions

Clean Core asserts the fuel could be used in pressurized heavy-water reactors without altering external geometry—a potentially important claim. It also argues for reduced waste and improved safety margins.

These remain hypotheses pending long-duration performance data, corrosion studies, fuel-cycle analysis, and regulatory review. Moreover, the fuel depends on HALEU—a material currently in short domestic supply. The U.S. is still rebuilding enrichment capacity after decades of decline.

In short: promising materials science, not yet deployable infrastructure.

China’s Parallel Track

China has moved further down the implementation curve. As previously reported by Rare Earth Exchanges™, Chinese researchers have brought a 2 MW thorium molten-salt reactor online in Gansu Province, with a 100 MW demonstration unit targeted for 2035. Unlike pellet-based fuel for conventional reactors, molten-salt designs dissolve fuel into liquid salt, representing a different technical pathway.

China’s structural advantage is vertical integration. Thorium occurs as a byproduct of rare-earth mining—an industry China dominates globally. Converting mining residues into reactor fuel aligns energy security with critical mineral control.

The Strategic Lens

Thorium is not merely an alternative fuel. It is a geopolitical lever linking nuclear innovation, enrichment capacity, and rare-earth byproduct streams. The United States is advancing cautiously through rigorous lab testing. China is pairing experimentation with deployment timelines.

Early success in a test reactor matters. But scale, supply chains, licensing, and capital discipline will decide who leads.

For investors and policymakers, the conclusion is disciplined: innovation has begun; industrialization remains the true contest.

Profile

Clean Core Thorium Energy (CCTE) is a Chicago-based nuclear fuel developer founded in 2017. The company’s core product, ANEEL™, is a proprietary blend of thorium-232 and High-Assay Low-Enriched Uranium (HALEU) designed for use in existing Pressurized Heavy Water Reactors (PHWRs), including CANDU reactors. Positioned as a “plug-and-play” alternative fuel, ANEEL aims to significantly reduce long-lived nuclear waste (claimed at over 85%), increase fuel burn-up efficiency, and enhance reactor safety without requiring major modifications to current reactor designs.

CCTE is targeting countries with established PHWR fleets—such as India, Canada, Romania, and Argentina—where adoption could theoretically occur within existing infrastructure.

The company is collaborating with the U.S. Department of Energy at Idaho National Laboratory for irradiation testing and with Texas A&M University for fuel fabrication and research. Founded by CEO Mehul Shah, Clean Core’s strategy centers on accelerating the commercialization of thorium fuel within the current global reactor fleet rather than waiting for next-generation reactor designs.