# Does ARC Clean Technology's INL Deal Clear the Path to a Sodium Fast Reactor FOAK?

[ARC Clean Technology](https://smrintel.com/companies/arc-clean-technology) has signed a Strategic Partnership Project agreement with Battelle Energy Alliance — the management and operating contractor of Idaho National Laboratory — establishing a multiyear framework to design, demonstrate, and deploy its ARC-100, a 100-MWe sodium-cooled fast reactor. The agreement covers engineering and design, advanced materials and manufacturing, high-performance computing and modeling, irradiation testing, reactor commissioning and operation, and site development — spanning the full lifecycle from detailed design through [first-of-a-kind (FOAK)](https://smrintel.com/glossary/foak) deployment. ARC previously received $27.5 million in DOE funding through the [Advanced Reactor Demonstration Program](https://smrintel.com/glossary/ardp)'s ARC-20 pathway and has been in prelicensing engagement with the NRC since 2020. The company intends to pursue licensing under 10 CFR Part 53 — the NRC's new regulatory framework for advanced reactors. No target date for NRC approval or commercial operation was included in the announcement.

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## What the INL Agreement Actually Covers

The mechanism here is DOE's Strategic Partnership Projects (SPP) Program, which makes INL's technical capabilities — facilities, personnel, and proprietary technologies — available to private industry partners on a cost-reimbursable basis. This is a well-trodden path for advanced reactor developers, but the scope articulated for ARC is notably broad.

According to ARC's announcement, INL's role will span:

- **Engineering and design support**
- **Advanced materials and manufacturing**
- **High-performance computing and modeling**
- **Irradiation testing**
- **Reactor commissioning and operation**
- **Site development**

That last item is worth flagging. Site development is an unusual inclusion for what is formally a technical support agreement, and it suggests ARC is at least scoping INL as a potential physical deployment location — not merely a technical collaborator.

Critically, the source material confirms ARC has **not** been named as a participant in either INL's Reactor Pilot Program or the Nuclear Energy Launch Pad. That distinction matters: both programs offer expedited DOE authorization pathways. ARC's path to operation runs through NRC licensing under Part 53, which is a longer and less certain road than the accelerated DOE authorization available to some INL-hosted projects.

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## Twenty Years in the Making: ARC's Unusual Trajectory

ARC is one of the oldest advanced reactor startups in the U.S. market, founded in 2006 — predating [TerraPower](https://smrintel.com/companies/terrapower) (2008), [X-energy](https://smrintel.com/companies/x-energy) (2009), and [Oklo Inc.](https://smrintel.com/companies/oklo) (2013) by several years. That longevity is a double-edged credential. It signals technical seriousness and institutional persistence; it also reflects how long sodium fast reactor development cycles actually run when they don't have the benefit of a major cost-shared federal demonstration program in the vein of TerraPower's Natrium project.

The company's early years involved multiple name changes — Advanced Reactor Technologies, Advanced Reactor Concepts, ARC Nuclear — before settling on ARC Clean Technology, and its pre-2015 activities are not well documented in public records.

The ARC-100 design uses metallic uranium-zirconium alloy fuel and a supercritical CO₂ Brayton Cycle power converter — a thermodynamic configuration that offers higher efficiency potential than a conventional steam Rankine cycle at sodium-fast-reactor operating temperatures. The design directly builds on operational data from the Experimental Breeder Reactor-II, which ran at INL for more than 30 years. That EBR-II heritage is a genuine technical asset: the passive safety characteristics of pool-type sodium fast reactors — including passive [decay heat](https://smrintel.com/glossary/decay-heat) removal — were convincingly demonstrated at EBR-II in the 1986 shutdown tests that the reactor community still cites today.

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## The Canadian Parallel Track

ARC's domestic INL partnership does not exist in isolation. The company has been progressing the ARC-100 through regulatory review with the [Canadian Nuclear Safety Commission](https://smrintel.com/glossary/cnsc) and has active deployment partnerships in Alberta. That dual-jurisdiction strategy is unusual among U.S.-based sodium fast reactor developers and could, in theory, provide a deployment proof point in Canada before U.S. NRC licensing is complete — though the source material does not indicate a Canadian timeline either.

The relationship with [GE Vernova / GE Hitachi Nuclear Energy](https://smrintel.com/companies/ge-vernova), which was announced in 2017 and involved licensing intellectual property related to GEH's Prism reactor design, is referenced in the source as ongoing context but the current status of that IP arrangement is not clarified in this announcement.

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## What This Means for the Sodium Fast Reactor Field

The U.S. sodium fast reactor landscape is now effectively two-track: TerraPower's Natrium (a 345-MWe sodium-cooled design backed by substantial ARDP funding and progressing toward construction in Wyoming) and ARC's considerably smaller 100-MWe offering, which is taking a different funding and licensing route. The scale difference matters commercially — Natrium targets utility-scale markets while ARC-100 is sized for industrial users, remote communities, and potentially data center operators who need dispatchable baseload without the capital commitment of a larger plant.

Part 53 licensing is the other pivotal variable. ARC is one of several developers betting that the NRC's new framework will provide a more technology-inclusive path than the existing 10 CFR Part 50/52 structure. Part 53 remains in development, and its practical application to a sodium fast reactor design — with its distinct confinement approach versus traditional light-water reactor containment — will test the framework's flexibility in ways that could set precedent for the entire [fast neutron spectrum](https://smrintel.com/glossary/fast-spectrum) reactor sector.

The absence of a disclosed deployment timeline in ARC's press release is notable but not surprising. NRC Part 53 licensing timelines are genuinely uncertain at this stage, and committing to a public date without a clear regulatory schedule would be commercially reckless.

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## Key Takeaways

- ARC Clean Technology has signed a multiyear Strategic Partnership Project agreement with Battelle Energy Alliance to advance the ARC-100 through design, demonstration, and FOAK deployment at INL.
- The ARC-100 is a 100-MWe sodium-cooled fast reactor fueled with metallic uranium-zirconium alloy, using a supercritical CO₂ Brayton Cycle power converter.
- ARC previously received $27.5 million in DOE ARDP funding via the ARC-20 pathway and is pursuing NRC licensing under 10 CFR Part 53.
- ARC is not participating in INL's Reactor Pilot Program or Nuclear Energy Launch Pad, meaning it must traverse full NRC licensing — no expedited DOE authorization is in play.
- The ARC-100 design builds directly on EBR-II operational heritage; INL's role spans the full development lifecycle including site development.
- No target date for NRC approval or commercial operation was disclosed.
- A parallel Canadian regulatory track with the CNSC and Alberta deployment partnerships continues alongside the U.S. effort.

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## Frequently Asked Questions

**What is the ARC-100 reactor and who is developing it?**
The ARC-100 is a 100-MWe sodium-cooled fast reactor developed by ARC Clean Technology, a Washington, D.C.–based company founded in 2006. It uses metallic uranium-zirconium alloy fuel and a supercritical CO₂ Brayton Cycle power converter, and its design builds on lessons from Idaho National Laboratory's Experimental Breeder Reactor-II.

**What does the INL Strategic Partnership Project agreement mean for ARC?**
The agreement gives ARC access to INL's technical capabilities — including irradiation testing, advanced materials, high-performance computing, and site development support — on a cost-reimbursable basis through DOE's Strategic Partnership Projects Program. It establishes a multiyear framework covering the full lifecycle from detailed design through FOAK deployment.

**How is ARC's INL deal different from TerraPower's or other INL reactor programs?**
ARC has not been selected for INL's Reactor Pilot Program or Nuclear Energy Launch Pad, which offer expedited DOE authorization. ARC must pursue full NRC licensing under the new 10 CFR Part 53 framework, making its timeline more dependent on NRC regulatory pace than some other INL-hosted projects.

**What is 10 CFR Part 53 and why does it matter for ARC?**
Part 53 is a new NRC regulatory framework designed to accommodate advanced reactor designs that don't fit neatly into the existing light-water reactor rules under 10 CFR Part 50 and 52. ARC is planning to use Part 53 for the ARC-100, but the framework is still being finalized, creating timeline uncertainty.

**How much federal funding has ARC Clean Technology received?**
According to the source material, ARC received $27.5 million in DOE funding through the ARDP's ARC-20 pathway, which aims to speed advanced reactor demonstration through industry-government cost-sharing.

**Is ARC also pursuing deployment outside the United States?**
Yes. ARC has been advancing the ARC-100 through regulatory review with the Canadian Nuclear Safety Commission and has active deployment partnerships in Alberta, Canada — a parallel track that predates the new INL agreement.