Lunar Nuclear Power: The New Space Race

Why in News? NASA, in collaboration with the US Department of Energy (DOE), is accelerating its Fission Surface Power (FSP) project to deploy a nuclear reactor near the Moon's south pole by 2030. Simultaneously, China and Russia have announced plans to install an automated nuclear power plant by 2035 for their International Lunar Research Station (ILRS).
This shift toward industrial-scale space operations raises fresh legal, environmental, and geopolitical questions over lunar territory, resource control, and international governance.

MoU: Signed in January 2026 between NASA and the US DOE to develop, fuel, authorise, and prepare a lunar fission surface power reactor for launch by 2030 under the Artemis programme.
Technical Specifications: Lightweight (under 6,000 kg), uses High Assay Low Enriched Uranium (HALEU) as fuel.
Operational Role: Provides baseload power for lunar habitats, life-support systems, rovers, and in-situ resource utilisation (ISRU) machinery; critical stepping stone for crewed Mars missions.
Earlier Space Reactor: US launched SNAP-10A in April 1965 – first space nuclear fission reactor; operated in Earth orbit for 43 days, generating ~500–600 W.
Note: Nuclear electricity first generated on lunar surface during Apollo 12 (1969) using a plutonium-238-powered SNAP-27 Radioisotope Thermoelectric Generator (RTG) producing at least 63 W. Unlike a fission reactor, RTGs convert decay heat directly without a chain reaction.

Overcoming the Lunar Night: A single day-night cycle lasts 28 Earth days, meaning ~14 continuous days of darkness. Solar arrays cannot sustain life-support without impractical battery reserves.
Accessing Permanently Shadowed Regions (PSRs): South pole craters remain in perpetual darkness and host water ice essential for survival and fuel. Zero sunlight makes solar unviable.
Scaling Beyond RTGs: RTGs produce only a few hundred watts; human bases require tens to hundreds of kilowatts, achievable only with compact fission reactors.
Enabling ISRU: Producing 10 tonnes of oxygen via ice extraction, electrolysis, and hydrogen liquefaction requires an estimated 68 kW of continuous electricity.

Scarcity of Prime Lunar Real Estate: Viable base locations near the south pole with accessible water-ice, safe terrain, and Earth communication lines are extremely limited.
Infrastructure as Influence: The 1967 Outer Space Treaty (OST) forbids national appropriation of celestial bodies, but deploying a reactor establishes de facto control over an area.
The "Safety Zone" Loophole: US-led Artemis Accords allow temporary "safety zones" to prevent harmful interference. NASA design studies examine locating reactors ~1 km away, but this is not a universal international requirement.
Article IX of OST: Mandates due regard for other states' interests and consultations to prevent harmful interference, but does not grant exclusive territorial rights.

ISRO-DAE Collaboration: Developing indigenous nuclear power technologies for space exploration to strengthen strategic autonomy.
Future Missions: Exploring 100-watt RTGs for long-duration missions like the Bharatiya Antariksh Station and the 2040 crewed lunar landing.
Chandrayaan-3: Carried two 1-watt Radioisotope Heater Units (RHUs) on its propulsion module – these only provided thermal heat to prevent freezing; proposed RTGs will convert decay heat directly into electricity.

Mass and Shielding Logistics: Heavy shielding required to protect astronauts and equipment from radiation.
Power Transmission Challenges: Locating reactors away from habitats necessitates robotic deployment, long-distance cables, and reliable distribution networks.
Heat Dissipation in a Vacuum: No atmosphere for convection; massive radiator panels required.
Autonomous Operation and Reliability: Must operate autonomously for years, withstanding launch vibrations, extreme temperatures, and limited maintenance.
Launch Safety and Core Activation: Reactors must be launched with unirradiated, "cold" fuel cores to prevent contamination in case of launch failure.
Risk of Irreversible Contamination: Mechanical failure, breach, or cooling loss could release radioactive material into pristine crater basins containing water ice.

Non-Binding U.N. Principles: The 1992 UN Principles Relevant to the Use of Nuclear Power Sources in Outer Space (UNGA Res 47/68) is non-binding, lacking enforcement authority.
Omission of Advanced Propulsion: 1992 Principles apply strictly to electricity-generating sources (RTGs, basic fission) and do not address Nuclear Thermal Propulsion (NTP) or Nuclear Electric Propulsion (NEP).
Absence of End-of-Life and Disposal Protocols: No clear, binding standards for decommissioning spent lunar reactors, containing irradiated waste, or disposing of jettisoned orbital reactors.
Ambiguities in Liability and Environmental Law: The 1972 Liability Convention governs damage on Earth or to aircraft, but offers ambiguous guidance for nuclear accidents in cis-lunar space or on celestial surfaces.
Tension Over "Freedom of Access": International space law guarantees free exploration, but unilateral reactor safety perimeters create friction with the prohibition against monopolising strategic lunar corridors.

Modernise the 1992 UN Framework: UN Committee on the Peaceful Uses of Outer Space (COPUOS) must draft binding technical standards covering high-output surface fission plants, advanced propulsion, and end-of-life radioactive waste disposal.
Establish an IAEA for Space: Create a multilateral oversight body modeled after the International Atomic Energy Agency (IAEA) to certify space reactor designs, monitor fissile material, and verify compliance.
Multilateral Consensus on Safety Zones: Define safety perimeters through international consultation, ensuring they remain functional, temporary, and non-exclusionary.
Enhance ISRO-DAE Synergy: India must aggressively fund domestic development of space-grade nuclear reactors to secure leadership in deep-space exploration and a stronger negotiating position in global space governance.

As humanity moves towards sustained lunar settlements, nuclear energy could become a key source of reliable space power.
However, the use of nuclear materials in space requires stringent safety standards to prevent risks to Earth and the lunar environment.
The international community should strengthen global nuclear safety norms through UN-COPUOS to ensure the responsible and sustainable use of nuclear technology in space.