Policy Update
Yashkirti Pal
World Nuclear Association (2025): Nuclear Power in India
India’s nuclear energy policy is founded upon a visionary “Three-Stage Nuclear Power Programme” formulated by Dr. Homi J. Bhabha in the 1950s. This framework aims to ensure long-term energy security by utilizing India’s limited uranium reserves in the first stage to trigger a “breeder” cycle in the second, which ultimately unlocks the nation’s massive thorium deposits in the third stage.
A historic milestone was achieved on April 6, 2026, when the 500 MWe Prototype Fast Breeder Reactor (PFBR) at Kalapakkam, Tamil Nadu, successfully attained its first criticality. Developed by Bhartiya Nabhikiya Vidyut Nigam Limited (BHAVINI), this reactor serves as the technological gateway to Stage II of the national strategy. The project was conceived to create a “closed fuel cycle” where nuclear “waste” from Stage I is processed into fuel that generates more fissile material than it consumes, thereby maximizing indigenous resource efficiency.
The main push for the FBR programme comes from geological constraints: India has only 2% of the world’s uranium reserves but over 25% of its thorium reserves.
While Thorium-232 is found abundantly in India’s monazite sands, it is a “fertile” rather than “fissile”–which means it cannot sustain a chain reaction on its own. The FBR is essential for using plutonium as a “starter” to transmute thorium into Uranium-233, which will eventually power the third stage of the nuclear programme. This second-stage breeder cycle is essential for realising India’s nuclear potential and ensuring long-term energy security.
FUNCTIONING
The Economic times (2025): India’s Prototype Fast Breeder Reactor achieves criticality, marks entry into stage-II nuclear programme
The Prototype Fast Breeder Reactor (PFBR) at Kalpakkam differs fundamentally from conventional thermal reactors in its use of “fast” neutrons. In traditional Pressurised Heavy Water Reactors (PHWRs), neutrons are slowed down by a moderator (like heavy water) to sustain fission reactions. FBRs, however, use high-energy neutrons and bypass the moderator entirely. This allows for a much higher rate of transmutation within the surrounding blanket of Uranium-238, which absorbs fast neutrons to become fissile Plutonium-239.
To manage the extreme heat generated in such a compact core, the PFBR utilizes liquid sodium as a coolant. Sodium is chosen for its heat transfer properties and its high boiling point, which allows the reactor to operate at high temperatures. This process effectively allows the reactor to “breed” more fuel than it uses.
However, the system faces significant technological challenges, primarily concerning the use of liquid sodium, which is highly reactive with water and air. This complexity has historically led to engineering delays and safety shutdowns globally. In the Indian context, the PFBR faced nearly two decades of delays and budget constraints due to stringent safety requirements and indigenous fabrication of massive reactor components. Critics also point to high capital costs associated with sodium-cooled reactors compared to conventional nuclear or renewable energy alternatives.
PERFORMANCE
Press Information Bureau (2025). Nuclear Power in Union Budget 2025-26
In the last two years, India’s nuclear energy landscape has undergone a radical transformation under the “Nuclear Energy Mission” outlined in the Union Budget 2025-26. As of April 2025, India’s total installed nuclear capacity reached 8,800 MW, with nuclear power contributing approximately 3.1% of the total electricity generation in FY 2024-25.
The enactment of the Sustainable Harnessing and Advancement of Nuclear Energy for Transforming India (SHANTI) Act in December 2025 has further modernised the sector by granting statutory independence of the Atomic Energy Regulatory Board (AERB) and allowing limited private participation. This legislative pivot is designed to help India reach a target of 100 GW by 2047. Budget allocations for FY 2026 have prioritized the development of Bharat Small Reactors (BSRs) alongside the FBR programme to ensure a diversified and scalable nuclear fleet.
IMPACT
The successful criticality of the PFBR has profound strategic and ecological implications, positioning India as only the second country after Russia to operate a commercial-scale fast breeder. By “burning” spent fuel from the first stage, India has transitioned toward a circular nuclear economy, which can reduce the volume and radiotoxicity of high-level waste. This development also reduces the nation’s structural dependence on imported uranium, which has faced supply chain vulnerabilities due to recent geopolitical conflicts in West Asia and Eastern Europe.
Most importantly, the PFBR serves as a technological bridge to the third stage of the program. It provides the material foundation necessary to eventually deploy thorium-based reactors, which could potentially power the country for centuries using domestic monazite sands found in coastal states.
EMERGING ISSUES
Several critical issues have emerged from the analysis of the current execution of the breeder program. First, the technological complexity of liquid sodium coolant remains a primary safety and engineering hurdle, requiring an impeccable safety culture and flawless leak detection. Stakeholders suggest that the AERB must utilize its statutory powers to create a more transparent regulatory model that separates safety oversight from the promotional functions of the Department of Atomic Energy.
Second, there is a significant human capital deficit, with the mission requiring a large number of additional personnel by 2035 to meet capacity targets. Policy experts recommend the immediate establishment of institutions in collaboration with major technical institutes to bridge this skill gap. Finally, the “plutonium economy” inherent in breeder technology invites intense international scrutiny. It is suggested that India must strengthen its diplomatic engagement and safeguard protocols to ensure that its expansion into fast reactors remains aligned with global non-proliferation norms while securing domestic energy sovereignty.
WAY FORWARD
The transition of the PFBR from an experimental prototype to a critical operational asset marks the official commencement of the second stage of India’s nuclear journey. This success proves that indigenous engineering can overcome extreme technical and geopolitical isolation. To achieve the “Viksit Bharat” vision by 2047, the government must now focus on the commercial fleet of fast reactors and the integration of small modular reactors through public-private partnerships.
The successful synchronization of the Bhabha vision with modern market reforms like the SHANTI Act indicates that India is moving toward an era of energy independence. By prioritizing resolution-oriented regulation and sustainable technological scaling, India is positioned to transform its nuclear sector into a reliable, low-carbon cornerstone of its 2070 Net-Zero commitment.
REFERENCES:
PIB (2026). A New Chapter in India’s Nuclear Journey. Press Information Bureau, Delhi
https://www.pib.gov.in/PressReleasePage.aspx?PRID=2249783®=3&lang=2
PIB (2026). Prototype Fast Breeder Reactor at Kalpakkam, Tamil Nadu attains First Criticality. Press Information Bureau, Delhi.
https://www.pib.gov.in/PressReleasePage.aspx?PRID=2249537®=3&lang=2
PIB (2025). The Sustainable Harnessing and Advancement of Nuclear Energy for Transforming India (SHANTI) Bill, 2025
https://static.pib.gov.in/WriteReadData/specificdocs/documents/2025/dec/doc20251222741701.pdf
PIB (2026). Historic Milestone: India’s 500 MWe Prototype Fast Breeder Reactor Achieves First Criticality
https://www.pib.gov.in/PressReleasePage.aspx?PRID=2249576®=3&lang=2
Parliament Question (2025). INCLUSION OF NUCLEAR ENERGY
https://www.pib.gov.in/PressReleasePage.aspx?PRID=2205123®=3&lang=1
World Nuclear Association (2025). Nuclear Power in IndiaNuclear Power in India.
https://world-nuclear.org/information-library/country-profiles/countries-g-n/india
South China Morning Post. India’s nuclear breakthrough lights path to energy independence
https://www.scmp.com/week-asia/economics/article/3350138/indias-nuclear-breakthrough-lights-path-energy-independence
ORF America. Workforce — not Policy — Is the Biggest Obstacle to India’s Nuclear Energy Ambitions.
https://orfamerica.org/orf-america-comments/workforce-biggest-obstacle-to-india-nuclear-energy-ambition
Nuclear Business Platform. Building India’s Nuclear Future: Can Human Capital Meet the 100 GW Target by 2047?
https://www.nuclearbusiness-platform.com/media/insights/can-human-capital-meet-india-nuclear-target
About the Contributor
Yashkirti Pal is a Research and Editorial Intern at Impact and Policy Research Institute (IMPRI).
Acknowledgement
The author sincerely thanks Gautham Shinde for his valuable feedback, as well as the IMPRI faculty for providing this platform and opportunity to share my work.
Disclaimer: All views expressed in the article belong solely to the author and not necessarily to the organisation.
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