India's Nuclear Energy Roadmap: 24 Reactors, 8.78 GW Today and 100 GW by 2047

India's Nuclear Energy Roadmap: 24 Reactors, 8.78 GW Today and 100 GW by 2047 Why in News?

• India operates 24 nuclear power reactors across seven sites with total installed capacity of 8.78 GW, while nine additional reactors are under construction and preparations continue for 10 more units.
• The Nuclear **Energy Mission **for Viksit Bharat targets 100 GW of nuclear power capacity by 2047, more than eleven times the present 8.78 GW base.
• The Union Budget 2025-26 allocated ₹20,000 crore for indigenous Small Modular Reactor development, placing advanced reactor technology within India's long-term clean-energy strategy. Nuclear Energy in the Power Mix
• Nuclear plants provide firm low-carbon electricity and can complement variable solar and wind generation.
• Unlike solar and wind, nuclear output is not dependent on daily weather, but reactors require high capital expenditure, long construction periods and rigorous safety systems.
• Moving from 8.78 GW to 100 GW by 2047 requires a very large acceleration in construction, fuel-cycle capability, manufacturing and regulation.
• Capacity factor and actual generation matter alongside installed GW because reliable baseload output is a key nuclear advantage. Three-Stage Nuclear Programme
• India's three-stage programme was designed around limited domestic uranium and large thorium resources.
• Stage I uses Pressurised Heavy Water Reactors with natural uranium; Stage II envisages fast breeder reactors using plutonium; Stage III aims to use thorium through uranium-233 pathways.
• Thorium-232 itself is fertile rather than fissile; it can be converted into fissile uranium-233.
• This distinction between fissile and fertile material is a recurring Prelims concept. Small Modular Reactors
• SMRs are smaller reactors designed for modular manufacture and potentially shorter construction schedules than very large conventional plants.
• The ₹20,000 crore Budget allocation for indigenous SMRs signals an attempt to build domestic technology and manufacturing capability.
• Potential uses include industrial power, replacement of retiring fossil units, remote grids and process heat, depending on reactor design.
• SMRs still require robust safety, waste management, security and economic assessment; 'small' does not mean regulation-free. Safety Architecture
• Nuclear safety uses defence-in-depth: multiple physical barriers, redundant systems, monitoring and emergency preparedness.
• India works with the International Atomic Energy Agency on safeguards, safety and security while retaining sovereign regulation.
• Low-probability, high-impact accidents make institutional independence and safety culture critical.
• Emergency planning must cover plant workers, surrounding communities, evacuation, communication and long-term environmental monitoring. Non-Power Applications
• Nuclear technologies are used in healthcare for diagnosis and cancer treatment, in agriculture for mutation breeding and pest control, and in food irradiation for preservation.
• Radioisotopes support industrial radiography, measurement and scientific research.
• Nuclear heat and electricity can potentially support desalination and low-carbon hydrogen production.
• Thus, atomic energy policy extends beyond electricity generation. Climate Dimension
• Nuclear power has low operational carbon emissions and can contribute to decarbonising electricity while maintaining firm capacity.
• Lifecycle emissions include mining, construction, fuel processing and decommissioning but remain far below unabated fossil generation in most assessments.
• India's rising electricity demand means decarbonisation requires adding clean supply while also expanding total generation.
• Nuclear, renewables, storage, grids and efficiency therefore function as a portfolio rather than mutually exclusive options. Waste and Fuel Cycle
• Spent nuclear fuel remains radioactive and requires secure handling, reprocessing or long-term disposal depending on policy.
• India's closed fuel-cycle approach seeks to recover useful fissile material from spent fuel.
• Radioactive waste is much smaller in physical volume than fossil-fuel waste but requires containment over long periods.
• Public confidence depends on transparent safety data and credible waste-management institutions. Way Forward
• Build domestic reactor manufacturing and skilled manpower to support the 100 GW by 2047 target.
• Ensure regulatory capability grows at least as fast as reactor deployment.
• Use standardised designs and fleet construction to reduce delays and costs.
• Invest in SMRs, fast reactors and thorium research without compromising near-term safety.
• Strengthen public communication on radiation, emergency planning and waste management. Prelims Quick Revision
• 24 operating reactors; seven sites; 8.78 GW installed nuclear capacity.
• Nine reactors under construction; preparations for 10 more.
• Target: 100 GW by 2047.
• ₹20,000 crore allocated in Union Budget 2025-26 for indigenous SMRs.
• Thorium-232 is fertile; uranium-233 is fissile. Probable Mains Question A 100 GW nuclear target can strengthen India's low-carbon energy security, but requires simultaneous progress in technology, regulation, fuel cycle and public trust. Discuss.