Nuclear Energy in India Technology, Applications, Safety, and Governance (UPSC/RAS/PSI) Current Affairs {Science & Technology}

Nodal Agency- Department of Atomic Energy (DAE) & Atomic Energy Regulatory Board (AERB)

Clean Baseload Grid Anchor- Nuclear energy provides round-the-clock, stable baseload electricity to complement intermittent renewables, reduce fossil fuel imports, and support India's Net Zero 2070 goals.
Highest Decarbonization Efficiency- 1 GW of nuclear capacity avoids approximately 5.4 million tonnes of CO₂ equivalent emissions per year (compared to 2.7 MT for hydro, 1.6 MT for wind, and 0.9 MT for solar).
Cumulative Carbon Abatement- Since 1969, India's nuclear fleet has avoided 851 million tonnes of CO2 equivalent emissions equivalent to the annual carbon sequestration of over 38 billion mature trees.
Current Operational Footprint- India operates 24 commercial nuclear power reactors across seven sites with a combined installed capacity of 8.78 GW, with 9 additional units (7.5 GW) under construction.
Medium-Term Fleet Expansion- Approved 10 indigenous Pressurized Heavy Water Reactors (PHWRs) in fleet mode and initiated pre-project activities for two 500 MW Fast Breeder Reactors (FBRs) to reach 22 GW by 2031–32.
Long-Term Target (100 GW by 2047)- A multi-agency roadmap combining DAE units/JVs (+32 GW) and CPSUs, State PSUs, and private sector ventures (+46 GW) under the Nuclear Energy Mission and SHANTI Act, 2025.

Foundational Resource Strategy- Formulated by Dr. Homi J. Bhabha in 1954 to navigate low-grade domestic uranium reserves while exploiting vast monazite thorium reserves found in coastal sands (Kerala, Tamil Nadu, Andhra Pradesh, Odisha, West Bengal, Jharkhand).
Stage I (PHWRs on Natural Uranium)- Utilizes indigenous Pressurized Heavy Water Reactors fueled by natural uranium with heavy water (D2O) as moderator/coolant, producing Plutonium-239 in spent fuel.
Stage II (Fast Breeder Reactors - FBRs)- Fueled by Pu239 and Mixed Oxide (MOX) fuel to breed more fissile material than consumed, while utilizing a Thorium-232 blanket to produce fissile Uranium-233 (U233).
Historic Stage II Criticality Milestone- The 500 MWe Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, developed by IGCAR with nearly 90% domestic component manufacturing, achieved its first criticality in April 2026.
Stage III (Thorium-Based U233 Reactors)- Envisages advanced thermal breeder reactors utilizing U233 derived from thorium, unlocking sustainable fuel self-sufficiency for centuries.
Closed Fuel Cycle Strategy- Follows a closed fuel cycle where spent fuel is reprocessed to extract unburned fissile isotopes, minimizing net high-level radioactive waste volumes.

Nuclear Energy Mission Allocation- The Union Budget 2025–26 earmarked ₹20,000 crore dedicated to research, design, development, and phased deployment of indigenous Small Modular Reactors.
Bharat Small Modular Reactor (BSMR-200)- A 220 MWe compact modular reactor jointly engineered by BARC and NPCIL designed for factory fabrication and flexible grid integration.
Diversified Indigenous SMR Pipeline- Developing the 55 MWe SMR-55 and High-Temperature Gas-Cooled Reactors (HTGRs) optimized for industrial hydrogen generation.
Decarbonizing Hard-to-Abate Sectors- SMRs (up to 300 MW) and Micro-Reactors (up to 20 MW) are engineered to replace retiring captive coal plants and supply direct high-temperature industrial heat.
Commercial Deployment Timeline- Aims to construct, commission, and operationalize at least five indigenous Small Modular Reactors across strategic industrial clusters by 2033.
Multi-Technology Reactor Fleet- Operates a diversified fleet comprising indigenous PHWRs, foreign Boiling Water Reactors (BWRs at Tarapur), Pressurized Water Reactors (PWRs at Kudankulam), and upcoming SMR designs.

Healthcare & Oncology- DAE facilities (BARC, TMC, IGCAR, TIFR) synthesize indigenous medical radioisotopes; the 150-bed Homi Bhabha Cancer Centre in Muzaffarpur opened in 2025, while TMC screened ~5 lakh women for cancers.
Medical Equipment Sterilization- Industrial gamma radiation facilities successfully sterilized 1.53 crore disposable medical devices and surgical kits in FY 2024–25.
Mutational Crop Breeding- BARC has developed 70 mutant crop seed varieties with high-yield, drought-, and disease-resistant traits, including TBM-9 banana and RTS-43 sorghum released in 2025.
Food Preservation & Export Logistics- 40 operational gamma irradiation centres extend the shelf life of onions, potatoes, mangoes, and seafood, enabling cost-effective sea-route exports.
Semiconductor & Rare Earth Standards- Commissioned India’s first electronics-grade (99.8% purity) Boron-11 enrichment plant at Talcher and released certified reference material (Ferrocarbonatite FC-BARC B1401) for rare earth extraction.
World’s First Nuclear Green Hydrogen Plant- Commissioned the world's first industrial hydrogen production facility powered by nuclear high-temperature process heat at Kalpakkam in 2026.

Defence-in-Depth Design- Features multiple physical barriers to isolate radioactivity- ceramic fuel pellets, sealed Zircaloy cladding, reactor pressure vessel/tubes, and reinforced concrete containment.
Independent Dual Shutdown Systems- Indian PHWRs incorporate two fast-acting, physically diverse, and independent shutdown mechanisms to trip the reactor under abnormal parameters.
ALARA Occupational Standards- Operates under the As Low as Reasonably Achievable (ALARA) principle; AERB mandates an occupational limit of 20 mSv/year (5-year average) and limits public exposure to 1 mSv/year.
Health Physics & Environmental Labs- Dedicated on-site Health Physics Units and Environmental Survey Laboratories continuously monitor air, water, soil, and vegetation around plant boundaries.
Indigenous Vitrification Technology- BARC developed proprietary vitrification systems that encapsulate high-level radioactive waste into stable borosilicate glass blocks for secure geological storage.
Post-Fukushima Safety Enhancements- Completed comprehensive seismic, tsunami, flood, and passive cooling upgrades across all operating and planned reactors.

Statutory Governance (SHANTI Act, 2025)- The Sustainable Harnessing and Advancement of Nuclear Technologies for India (SHANTI) Act, 2025 modernizes the regulatory, liability, and private participation framework.
Independent Oversight via AERB- The Atomic Energy Regulatory Board enforces safety codes under the Atomic Energy (Safe Disposal of Radioactive Wastes) Rules, 1987.
Multi-Tiered Emergency Response Plans- Every installation maintains mandatory AERB-approved On-site and Off-site Emergency Response Plans integrated into District Disaster Management Plans.
Zoning & Radial Buffer Protections- Facilities enforce restricted Exclusion Zones and a 16-kilometer Emergency Planning Zone (EPZ) with established real-time early warning networks.
Medical Emergency Readiness- DAE and NPCIL partner with the Ministry of Health to maintain specialized Radiation Emergency Medical Networks and conduct periodic multi-agency mock drills.
International Safeguards Compliance- Cooperates closely with the International Atomic Energy Agency (IAEA) to uphold global standards for physical security, non-proliferation safeguards, and peaceful utilization.

Source: PIB