Space Nuclear Power Faces Logistical and Economic Barriers, DRACO Canceled

This article summarizes reporting by Aerospace America.

For decades, the aerospace industry has recognized the immense potential of space nuclear power. Despite possessing the foundational technical knowledge since the 1960s, modern spacecraft continue to rely predominantly on chemical propulsion and solar arrays. A recent workshop at the May 2026 AIAA ASCEND event in Washington, D.C., sought to unpack this enduring paradox.

According to reporting by Aerospace America, a panel of aerospace and policy experts concluded that the primary barriers to deploying nuclear reactors in space are no longer technical. Instead, the industry is grappling with logistical, economic, and systemic hurdles that have repeatedly stalled progress.

The recent cancellation of the highly publicized Demonstration Rocket for Agile Cislunar Operations (DRACO) program in mid-2025 serves as a stark, real-world validation of these expert assessments, demonstrating how shifting economic landscapes can ground even the most ambitious nuclear initiatives.

The Illusion of Technical Barriers

During the ASCEND workshop, hosted by Brian Weeden of The Aerospace Corporation, panelists emphasized the extensive capital and time already invested in space nuclear research. Bhavya Lal, a professor at the RAND School of Public Policy, highlighted that the United States has spent 60 years and over $20 billion proving that the technology itself is viable.

“The technology has never been the bottleneck. What has failed each time is the system around the reactor,” Lal stated, according to the workshop coverage.

Lal further explained that these systemic failures include shifting mission scopes, a lack of political continuity, and unstable leadership architectures that prevent long-term projects from reaching the launch pad.

Stagnation Since the Space Race

The historical context of space nuclear power underscores the panel’s frustrations. During the Cold War, the U.S. heavily researched and successfully ground-tested nuclear thermal rockets through initiatives like the NERVA program. However, as reported by Aerospace America, these programs were ultimately scrapped due to changing political administrations and budget cuts following the Apollo era.

Tabitha Dodson, a program manager at the DARPA Defense Sciences Office, noted the resulting stagnation in the field during her panel remarks.

“The United States hasn’t really evolved our nuclear space technology since the fifties or sixties,” Dodson remarked at the event.

Dodson added that current research priorities have had to pivot toward radioisotope power systems and direct-energy power conversion systems to maintain momentum in a risk-averse funding environment.

Economic Realities and the DRACO Cancellation

The intersection of aerospace engineering and economic viability was brought into sharp focus with the recent fate of the DRACO program. Initiated in 2020 as a joint effort between DARPA, NASA, Lockheed Martin, and BWX Technologies, DRACO aimed to test a nuclear thermal rocket in orbit by 2027. Nuclear thermal propulsion was projected to be two to three times more efficient than chemical propulsion, potentially halving the travel time to Mars.

The Impact of Commercial Launch Costs

In June 2025, DARPA officially canceled the DRACO program. According to public statements from DARPA deputy director Rob McHenry, the decision was driven entirely by economics rather than technical failure.

The rapid decrease in commercial launch costs, largely propelled by the heavy-lift capabilities of companies like SpaceX, fundamentally altered the financial equation. The massive research and development costs required to perfect nuclear thermal propulsion could no longer be justified by a positive return on investment when chemical launches had become so inexpensive.

Current Mandates and the Path Forward

Despite the setbacks in nuclear propulsion, the push for nuclear power generation in space remains robust. Current executive mandates have established ambitious timelines, aiming for a functional nuclear reactor in space by 2028 and a working reactor on the lunar surface by 2030. These systems are considered critical for supporting long-term lunar habitats and deep-space exploration missions.

Balancing Ambition and Safety

Aaron Miles, Coordinator for Strategic Capabilities at the White House Office of Science and Technology Policy, discussed these targets at the ASCEND workshop. He emphasized the administration’s focus on setting goals that push the industry forward without ignoring logistical realities.

“Lunar surface reactor development efforts and in-space reactor efforts can benefit each other,” Miles noted regarding the dual mandates.

To meet these goals while navigating strict regulatory and safety hurdles, modern programs are utilizing High-Assay Low-Enriched Uranium (HALEU). Furthermore, contemporary reactor designs ensure that fission is only initiated once the system is safely in orbit, mitigating the historical public fears and international treaty complications associated with launching nuclear material.

AirPro News analysis

We observe that the pivot from nuclear propulsion (like the canceled DRACO program) to stationary nuclear surface power reflects a pragmatic maturation of the aerospace sector. While reusable chemical rockets have decisively won the current launch economics battle, sustained deep-space habitats and lunar bases will undeniably require the continuous, high-density energy that only nuclear reactors can provide. The looming 2028 and 2030 mandates will serve as a critical test of whether the U.S. government and its commercial partners can finally overcome the systemic inertia and political discontinuity described by the ASCEND panelists.

Frequently Asked Questions

What was the DRACO program?

The Demonstration Rocket for Agile Cislunar Operations (DRACO) was a joint U.S. government and industry program initiated in 2020 to develop and test a nuclear thermal rocket by 2027. It was canceled in June 2025 due to shifting economic priorities and the falling cost of commercial chemical rocket launches.

Why is nuclear power needed in space?

While solar panels and chemical batteries are sufficient for operations near Earth, deep-space exploration and permanent lunar or Martian habitats require reliable, high-density power sources that can operate continuously without sunlight or frequent resupply.

What is HALEU?

High-Assay Low-Enriched Uranium (HALEU) is a type of nuclear fuel that provides a balance between high energy output and safety, making it a preferred choice for modern space reactor designs to comply with international regulations and safety standards.

Sources

• Aerospace America