Who is Dr. Anil Kakodkar?
Dr. Anil Kakodkar is one of India's most respected nuclear physicists and a key architect of its atomic energy program. As the former Chairman of the Atomic Energy Commission of India and Director of the Bhabha Atomic Research Centre (BARC), his career
is deeply intertwined with India's journey towards nuclear self-reliance. He played a significant role in the design of the Dhruva research reactor and India's peaceful nuclear tests. For decades, he has been a vocal champion for leveraging India's vast thorium reserves to secure its long-term energy future. His recent statements are seen not as a new idea, but as a strategic push from a seasoned expert.
What is Thorium and Why is it Important?
Thorium is a naturally abundant, slightly radioactive metal. Unlike uranium, which is currently the primary fuel for nuclear reactors, thorium itself is not fissile, meaning it cannot create a nuclear chain reaction on its own. Instead, it is a 'fertile' material. When it absorbs a neutron in a reactor, it transforms into Uranium-233, which is an excellent fissile fuel. India has one of the world's largest reserves of thorium, primarily found in the monazite sands of its coastal regions, but has limited domestic uranium reserves. This disparity is the core reason why thorium has been central to India's long-term nuclear strategy.
India's Three-Stage Nuclear Vision
To understand Kakodkar's urgency, one must look at the three-stage nuclear program envisioned by Dr. Homi J. Bhabha. Stage 1 involves using natural uranium in Pressurised Heavy Water Reactors (PHWRs) to generate power and produce plutonium as a byproduct. Stage 2 uses this plutonium in Fast Breeder Reactors (FBRs), which produce more fuel than they consume while also converting thorium into Uranium-233. India recently achieved a major milestone in this stage with its first indigenous FBR attaining criticality in April 2026. Stage 3 is the ultimate goal: a fleet of advanced reactors running on a self-sustaining cycle of thorium and Uranium-233, promising energy independence for centuries.
Why Push for Thorium Now?
Dr. Kakodkar's recent call, made at the 6th International Climate Summit, is based on a pragmatic assessment of the global and domestic landscape. He argues that with global uranium supplies expected to come under pressure as more countries turn to nuclear power, India cannot afford to wait. His proposal is to introduce thorium into the existing Stage 1 PHWRs sooner rather than later, without waiting for Stage 2 to fully mature. This would accelerate the process of irradiating thorium and building an inventory of fissile Uranium-233, effectively fast-tracking parts of the Stage 3 goal while leveraging the commercially proven PHWR fleet.
The Pros and Cons of Thorium
The allure of thorium is strong. It's more abundant than uranium, and thorium-based reactors produce significantly less long-lived nuclear waste. The waste that is produced becomes safe in a few hundred years, compared to tens of thousands for uranium waste. Proponents also point to inherent safety features in certain thorium reactor designs. However, the path is not without challenges. The technology for thorium fuel cycles is less mature and more expensive to start up. The irradiated fuel requires complex and costly remote handling due to high gamma radiation. Furthermore, there is limited global operational experience with large-scale thorium reactors.
The Road Ahead for India
Dr. Kakodkar's proposal is a strategic nudge to accelerate a long-held national ambition. By suggesting the integration of thorium into the current PHWR fleet, he is advocating for a parallel path that could hasten India’s journey to energy independence. This would involve developing advanced fuel recycling technologies and potentially exploring different reactor designs like molten salt reactors in the medium term. The government has already set an ambitious goal of achieving 100 GW of nuclear power capacity by 2047. For India, the debate isn't about whether to use thorium, but how and how fast. The push from one of its most eminent nuclear pioneers suggests the time for that transition may be now.
