Thorium Nuclear Energy: Thorium and India’s 100 GWe Nuclear Power Vision

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• The SHANTI Act 2025 marks a major step in expanding India’s nuclear energy sector by opening it to public and private participation, academia, and industry, while highlighting the need for a supportive regulatory framework. 
• However, India’s planned 100 GWe nuclear capacity by 2047 relies heavily on imported uranium, as domestic reserves are limited. 
• Meeting this target would require 18,000–20,000 tonnes of uranium annually, raising concerns about long-term sustainability and global competition for uranium resources.

Thorium Recycling as a Solution to Uranium Constraints

• With global energy demand expected to rise beyond 2047, nuclear power will remain important until alternatives such as fusion become viable. 
• However, reliance on once-through uranium fuel cycles is unsustainable due to limited global reserves. 
• Nuclear fuel recycling can increase the energy extracted from fuel by 50–100 times, but many countries avoid it due to concerns over nuclear weapons proliferation.
• India’s thorium-based fuel cycle offers a potential solution. With the largest thorium reserves in the world, India could achieve greater energy independence while reducing proliferation risks. 
• Advancing thorium utilisation therefore requires significant research, innovation, and multidisciplinary collaboration.

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Fast Breeder Reactors and Thorium Pathways for India’s Nuclear Future

• India’s nuclear strategy is based on a three-stage programme designed to utilise its vast thorium resources. 
  • Stage I: Pressurised Heavy Water Reactors (PHWRs)
    • Fuel: Natural Uranium (U-238)
    • Process: Uses natural uranium to produce electricity and converts into plutonium  as a byproduct.
  • Stage II: Fast Breeder Reactors (FBRs)
    • Fuel: Plutonium- 239 (from Stage I) and Uranium- 238.
    • Process: FBRs produce more fissile material than they consume (breeding), essential for generating the inventory needed for the final stage.
  • Stage III: Thorium-Based Reactors
    • Fuel: Thorium- 232 and Plutonium- 239.
    • Process: Utilizes thorium-232, which converts into uranium-233 to generate energy, aimed at long-term sustainability. 
• The next stage involves Fast Breeder Reactors (FBRs), with the 500 MWe Prototype Fast Breeder Reactor nearing completion.

Role of Fast Breeder Reactors

• FBRs are intended to irradiate thorium and produce uranium-233, the key fuel required for the third stage of the nuclear programme. 
• However, large-scale deployment of fast reactors is expected only in the coming decades.

Expanding PHWR Capacity and the 100 GWe Mission

• India’s 100 GWe nuclear energy target by 2047 is currently driven mainly by Pressurised Heavy Water Reactors (PHWRs) using imported uranium. 
• This expansion also creates an opportunity to irradiate thorium within PHWRs, helping produce uranium-233 earlier.

HALEU–Thorium Fuel as an Alternative Path

• Thorium can be used in PHWRs together with High-Assay Low-Enriched Uranium (HALEU) without major design changes. 
• This approach offers advantages such as higher fuel burnup, reduced spent fuel, improved safety, and lower waste management costs.
• Developing HALEU–thorium fuel requires accelerated irradiation testing, which India currently lacks. International cooperation and partnerships could help advance research and technology development.

Future Role of SMRs and Advanced Technologies

• India also aims to develop Thorium Molten Salt Reactors (TMSRs) and Small Modular Reactors (SMRs) capable of producing low-cost green hydrogen and supporting the clean energy transition.
• Advanced reactors, including metal-fuelled FBRs and SMRs, could use pyrochemical recycling technology to process spent fuel efficiently, strengthening long-term nuclear sustainability.

Toward Energy Independence

• With policy support from the SHANTI Act, collaboration between government, industry, and academia can accelerate innovation and help India achieve greater energy security and nuclear self-reliance.

Source: IE | IE