Q. Nuclear power can enable sustained exploration of the Moon, Mars and deep space, but its growing use also creates serious safety, environmental and regulatory concerns. Discuss the potential of nuclear energy in space and examine whether the existing international legal framework is adequate. Suggest a suitable way forward for India.
Introduction:
Solar power becomes less effective at greater distances from the Sun, during long lunar nights and in permanently shadowed regions. Nuclear energy provides compact, continuous and sunlight-independent power, making it important for deep-space exploration and permanent lunar or Martian bases.
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Potential of Nuclear Energy in Space
- Radioisotope systems: Radioisotope Thermoelectric Generators convert heat from radioactive decay, usually of plutonium-238, into electricity for decades.
- High-power generation: Fission reactors can support habitats, life-support systems, communications and scientific instruments.
- Nuclear propulsion: Nuclear Thermal Propulsion can provide nearly twice the propellant efficiency of chemical rockets, while Nuclear Electric Propulsion offers high efficiency for long journeys.
- Resource utilisation: Reactors can support the extraction of water and oxygen from lunar soil.
- Human missions: Faster journeys to Mars can reduce astronauts’ exposure to space radiation and enable greater cargo capacity.
Safety and Technical Concerns
- Launch failures or accidental re-entry may release radioactive material on Earth.
- Reactors require specialised shielding, materials and operational controls.
- Nuclear propulsion remains technologically immature.
- The supply of plutonium-238 is limited.
- Decommissioned reactors and radioactive waste require safe disposal.
The Cosmos 954 accident of 1978, which scattered radioactive debris over Canada, demonstrates these risks.
Adequacy of International Law
- The Outer Space Treaty, 1967 prohibits nuclear weapons in space and requires avoidance of harmful contamination, but permits peaceful nuclear applications.
- The Liability Convention, 1972 makes launching States absolutely liable for damage caused on Earth or to aircraft.
- The 1992 UN Principles cover safety assessment and re-entry notification but apply mainly to non-propulsive nuclear power sources.
- The 2009 COPUOS–IAEA Framework provides safety guidance but is not a comprehensive binding regime.
Thus, existing law does not fully regulate high-power reactors, nuclear propulsion, private operators or end-of-mission disposal.
Way Forward
- Create common global standards covering design, testing, launch, operation and disposal.
- Update the 1992 UN Principles to include nuclear propulsion and surface reactors.
- Establish mandatory environmental assessment and emergency-notification mechanisms.
- Clarify liability where public and private entities jointly operate missions.
- Develop accident-resistant designs and safe reactor-decommissioning rules.
- India should develop indigenous RTGs and participate actively in COPUOS–IAEA negotiations.
Conclusion:
Space-based nuclear power must develop under a framework combining technological innovation with precaution, transparency and international responsibility. India can promote a rules-based system that enables peaceful exploration while protecting Earth and outer-space environments.
