The science, technology, and pitfalls of using nuclear power in space, PgII

Key Highlights:

• The US plans to deploy a small nuclear reactor on the moon by the early 2030s under the Lunar Fission Surface Power Project.
• Radioisotope thermoelectric generators (RTGs) have powered spacecraft like Voyager, but produce limited power.
• Compact fission reactors, about the size of a shipping container, can generate tens to hundreds of kilowatts.
• The 1992 United Nations Principles offer a framework for nuclear power in space but have limitations.
• India has the potential to lead in deep-space innovation by developing a space reactor through ISRO and the Department of Atomic Energy.

Detailed Insights:

• Lunar nights lasting two weeks and limited sunlight at the poles constrain solar energy, making nuclear power essential for sustained lunar and Mars presence.
• Nuclear reactors buried beneath the Martian regolith could provide shielding from cosmic radiation while producing large amounts of energy for habitats and resource utilization.
• Nuclear thermal propulsion could shorten trips to Mars, reducing crew exposure to cosmic rays, while nuclear electric propulsion offers efficient thrust for deep-space probes.
• The 1992 UN Principles lack binding technical standards for reactor design, operational limits, and disposal, creating governance gaps in space nuclear activities.
• The Outer Space Treaty, the Liability Convention, and the Nuclear Non-Proliferation Treaty offer partial coverage but lack protocols for preventing radioactive contamination of celestial bodies.
• Updating the legal framework to include propulsion reactors, establish safety benchmarks, and define disposal standards is crucial to prevent accidents and ensure responsible nuclear practices.
• A multilateral oversight mechanism, similar to the International Atomic Energy Agency, could certify designs, verify compliance, and enhance transparency in space nuclear activities.

Key Concepts Involved:

• Radioisotope Thermoelectric Generators (RTGs): Devices converting heat from radioactive decay into electricity.
• In-Situ Resource Utilisation: Converting resources available on other planets into useful materials.
• Nuclear Thermal Propulsion: Heating a propellant with nuclear decay and expelling it for thrust.