Nuclear energy and the three-stage programme

India's nuclear programme began with the Atomic Energy Commission in 1948 and the Department of Atomic Energy in 1954, under the scientific leadership of Homi Bhabha. Its central idea, the three-stage programme, was designed around India's resource position: modest uranium reserves but large thorium reserves. The plan uses uranium-fuelled reactors first, then plutonium-fuelled fast breeder reactors that produce more fissile material than they consume, and finally thorium-based reactors. Each stage is meant to create the fuel for the next.

The first stage uses pressurised heavy water reactors, which run on natural uranium and produce plutonium as a by-product. The second stage uses fast breeder reactors, with a prototype fast breeder reactor under development at Kalpakkam in Tamil Nadu. The third stage, thorium-based, remains a longer-term research goal, including the advanced heavy water reactor concept. The programme's long horizon is its defining feature: it was designed as a multi-decade project, not a single plant purchase.

Nuclear power's appeal is low-carbon electricity that runs continuously, unlike solar and wind, which vary with weather. Its difficulties are equally clear: high upfront cost, long construction times, waste that must be isolated for very long periods, and public concern after accidents abroad, above all Fukushima in 2011. India also faced a long period of restricted access to international nuclear trade after its 1974 test, eased by the 2008 Nuclear Suppliers Group waiver and civil nuclear agreements that followed.

Domestic law adds a distinctive element. The Civil Liability for Nuclear Damage Act of 2010 channels liability to the operator but also allows the operator recourse against suppliers in defined circumstances, a provision that suppliers have cited as a reason for caution in new projects. Land, water and local consent are further constraints, as plant sites must satisfy safety, seismic and coastal conditions and win acceptance from nearby communities.

Nuclear energy should therefore be studied as a system, not a single technology: fuel resources, reactor stages, waste management, liability law, international controls and public acceptance all shape whether capacity grows. Its contribution to a low-carbon grid is real but limited by cost and speed, which is why it is usually presented as one part of the energy mix rather than a replacement for renewables.