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GS Paper: GS3

  • Climate change reshaping disease patterns, straining health systems, finds report 

    Why in the News?

    Climate change is no longer a distant environmental issue; it is already affecting public health in India. The report “Under the Weather: India’s Climate-Health Challenges” shows a clear shift, from occasional disease outbreaks to a larger, ongoing health crisis caused by changing climate patterns. With nearly 40% of districts at high risk from extreme weather events, it highlights a turning point where climate and health policies must be addressed together, not separately.

    Why is climate change now being seen as a public health crisis in India?

    1. Health-risk multiplier: Climate variability amplifies both communicable and non-communicable diseases, increasing overall disease burden and healthcare pressure.
      1. Vector-borne diseases (Communicable): Rising temperatures and erratic rainfall expand mosquito habitats, increasing diseases like dengue and malaria. Example: Himachal Pradesh (Shimla) and parts of Jammu & Kashmir have recently reported dengue cases, regions that were earlier too cold for such outbreaks.
      2. Water-borne diseases (Communicable): Flooding contaminates water sources, leading to outbreaks of cholera and hepatitis. Case study: Kerala floods (2018) led to spikes in leptospirosis and diarrhoeal diseases due to stagnant and contaminated water.
      3. Heat-related illnesses (Non-communicable): Extreme heat increases heat strokes, dehydration, and cardiovascular stress. Case study: India Heatwave (2015) caused over 2,000 deaths, especially in Andhra Pradesh and Telangana, overwhelming hospitals.
      4. Air pollution-linked diseases (Non-communicable): Climate change worsens air quality (e.g., higher PM2.5), increasing respiratory and cardiac illnesses. Example: Delhi NCR sees seasonal spikes in asthma, COPD, and heart conditions, especially during winter inversion periods.
      5. Maternal and child health impacts: Heat stress and pollution increase risks in pregnancy and early childhood. Case study: Studies in South Asia show higher preterm births during heatwaves; infants are more vulnerable due to poor heat regulation.
      6. Livelihood-health linkage: Climate shocks reduce income, leading to malnutrition and weakened immunity. Example: Drought-prone regions of Maharashtra (Marathwada) show increased child malnutrition and related diseases during repeated drought years. 
    2. Scale of vulnerability: Nearly 40% of districts face high risk from extreme weather events, indicating systemic exposure.
    3. Shift in disease ecology: Warmer temperatures and erratic rainfall expand disease vectors into new geographies.
    4. Systemic disruption: Climate events impact livelihoods, healthcare access, and infrastructure simultaneously.

    How is climate change reshaping the disease landscape in India?

    1. Vector-borne expansion: Changing rainfall patterns and warming temperatures expand diseases like dengue and malaria into previously unaffected regions such as Shimla, Himalayan foothills, and Jammu & Kashmir; Pune identified as a major dengue hotspot.
    2. Water-borne diseases: Increased flooding triggers outbreaks of cholera and hepatitis, linked to contaminated water sources.
      1. Example: Assam floods (2022) led to a surge in acute diarrhoeal diseases and suspected hepatitis cases, as submerged sanitation systems contaminated water sources across districts like Barpeta and Nagaon.
      2. Example: Mumbai floods (2005) triggered outbreaks of leptospirosis, hepatitis A, and gastroenteritis, due to overflow of drainage systems and exposure to polluted water.
    3. Non-communicable diseases (NCDs): Heat exposure increases cardiovascular mortality, while air pollution worsens respiratory illnesses and chronic conditions.
      1. A meta-analysis in Environmental Research shows that each 1°C rise above ~29°C increases all-cause mortality by ~3.9%, highlighting strong cardiovascular and systemic stress due to heat.
    4. Climate-sensitive transmission: Altered environmental conditions change pathogen survival and transmission dynamics.
      1. Cholera bacteria survival: Warmer sea surface temperatures and plankton blooms support Vibrio cholerae survival. Example: West Bengal coastal regions (Sundarbans) report recurrent cholera outbreaks linked to changing coastal water conditions.

    Which populations are disproportionately affected and why?

    1. Vulnerable groups: Rural populations, informal workers, women, and children face highest risks due to limited adaptive capacity.
    2. Occupational exposure: Outdoor workers experience productivity loss and health risks; India lost an estimated 160 billion labour hours in 2021 due to heat exposure.
    3. Gendered impacts: Women face higher exposure and health burdens due to socio-economic constraints and caregiving roles.
    4. Inequality deepening: Climate impacts exacerbate existing socio-economic inequalities and health disparities.

    What are the direct and indirect health impacts of climate change?

    1. Heat stress: Extreme heat linked to 16% increase in odds of preterm birth; increases risks for infants and pregnant women.
    2. Air pollution linkages: Rising PM2.5 levels associated with hypertension, pre-eclampsia, and gestational blood pressure disorders.Child vulnerability: Infants have limited thermoregulation, increasing susceptibility to heat stress and respiratory illnesses.
    3. Livelihood-health nexus: Climate shocks reduce income and productivity, reinforcing cycles of vulnerability.

    How does climate change disrupt healthcare systems and access?

    1. Infrastructure damage: Floods and cyclones damage hospitals, disrupt supply chains of medicines and vaccines.
    2. Access barriers: Remote areas face healthcare exclusion during disasters, leading to untreated illnesses.
    3. Service disruption: Climate events reduce continuity of care and strain emergency response systems.
    4. System overload: Increased disease burden overwhelms already fragile public health infrastructure.

    What measures have been taken to address climate-health challenges?

    1. Policy integration: Initiatives like the National Action Plan on Climate Change and Human Health aim to align climate and health strategies.
    2. Localized adaptation:State-level action plans focus on region-specific vulnerabilities and responses.
      1. Heat Action Plans (HAPs): State and city-level plans customize responses to local heat risks through early warnings, cooling centers, and hospital preparedness. Example: Ahmedabad Heat Action Plan (Gujarat)—India’s first HAP, reduced heatwave mortality by introducing early warning systems, public advisories, and training for healthcare workers.
      2. Flood-resilient health planning: States prone to floods integrate disease surveillance and emergency health response. Example: Odisha developed disaster-resilient health infrastructure and rapid response systems after the 1999 super cyclone, ensuring minimal disease outbreaks during recent cyclones like Fani (2019).
      3. Vector-borne disease control: Region-specific strategies target local disease patterns and climate conditions. Example: Kerala uses pre-monsoon mosquito control drives and decentralized surveillance to manage dengue and malaria risks.
      4. Drought and nutrition linkage: States facing water stress integrate health and nutrition interventions. Example: Maharashtra (Marathwada) implements nutrition programs and water management schemes to address drought-linked malnutrition and health issues. 
    3. Early warning systems: Expansion of climate-linked disease surveillance and forecasting mechanisms.
    4. Cross-sectoral convergence: Efforts to integrate health, environment, and disaster management frameworks.

    What are the key gaps and challenges in India’s response?

    1. Data fragmentation: Lack of disaggregated data linking climate events to health outcomes limits targeted interventions.
    2. Funding constraints: Insufficient investment in climate-resilient healthcare infrastructure.
    3. Awareness deficit: Limited public understanding reduces adaptive capacity and risk preparedness.
    4. Governance gaps: Weak coordination across government, private sector, and civil society. 

    Conclusion

    Climate change is transforming India’s health landscape from episodic crises to a chronic systemic challenge. Addressing this requires integrating climate resilience into public health systems, strengthening data-driven governance, and prioritizing vulnerable populations to ensure equitable health outcomes.

    PYQ Relevance

    [UPSC 2017] Climate Change’ is a global problem. How India will be affected by climate change? How Himalayan and coastal states of India will be affected?

    Linkage: Climate change is a recurring GS-3 theme, with UPSC repeatedly focusing on its impacts, vulnerability, and disasters. This article extends that dimension by linking it to public health risks and disease patterns, enriching answers with current relevance.

  • World Bank Backs RBI Exchange Rate Policy

    Why in the News?

    The World Bank praised the Reserve Bank of India’s exchange rate management, calling it consistent and sensible amid volatility caused by the West Asia conflict.

    Key Highlights

    • World Bank said RBI is managing short term volatility effectively
    • RBI not targeting any fixed rupee level
    • Focus is on smoothening excessive fluctuations
    • Policy helps reduce financial instability during global shocks

    Rupee Volatility Background

    • Rupee crossed:
      • 90 per dollar (Dec 2025)
      • 92 to 95 per dollar (March 2026)
    • Reasons:
      • West Asia conflict
      • Foreign investment outflows
      • Global risk aversion

    Foreign Portfolio Investors sold:

    • $12.7 billion Indian equities in March 2026
    • Highest ever monthly outflow

    RBI Strategy

    RBI intervened through:

    • Foreign currency sales
    • Spot market intervention
    • Forward market operations

    Objective:

    • Control volatility
    • Avoid abrupt currency movements
    [2019] Which one of the following is not the most likely measure the Government/RBI takes to stop the slide of Indian rupee? (a) Curbing imports of non-essential goods and promoting exports (b) Encouraging Indian borrowers to issue rupee-denominated Masala Bonds (c) Easing conditions relating to external commercial borrowing (d) Following an expansionary monetary policy

  • World Bank Cuts India Growth Forecast to 6.6% for FY 2026-27

    Why in the News?

    The World Bank has revised India’s GDP growth forecast to 6.6% for FY 2026-27, down from 7.2%, citing the impact of the West Asia conflict on energy prices, consumption, and industrial activity.

    Key Highlights

    • New Growth Projection (FY 2026-27): 6.6%
    • Earlier Projection: 7.2%
    • Reason for Revision: Prolonged West Asia conflict affecting global energy supply
    • The World Bank noted that without the conflict, India’s growth would have remained around 7.2%.

    Reasons for Growth Slowdown

    1. Higher Energy Prices

    • India heavily depends on oil and gas imports
    • Rising prices increase: Inflation, Production costs, and Fiscal pressure

    2. Weak Industrial Growth

    • Industrial growth expected to fall: 8.8% → 7.5%
    • Sectors affected: Electronics, Automobiles, and Export oriented industries

    3. Lower Export Demand

    • Gulf region slowdown affects: Trade, Services, and Manufacturing exports

    Additional Risks Identified

    • Reduced remittances from Gulf countries
    • Pressure on rupee
    • Increase in current account deficit
    • Higher inflation
    • Fiscal consolidation challenges
    • Note: 38% of India’s remittances come from Gulf economies
    [2015] Which one of the following issues the ‘Global Economic Prospects’ report periodically? (a) The Asian Development Bank (b) The European Bank for Reconstruction and Development (c) The US Federal Reserve Bank (d) The World Bank

  • Why India wants fast breeder reactors

    Why in the News?

    India’s Prototype Fast Breeder Reactor (PFBR) at Kalpakkam achieved “criticality” for the first time, marking the operationalisation of fast breeder technology after decades of delay, cost escalation (₹3,500 crore to ₹6,800 crore), and global scepticism about economic viability. This is significant as it transitions India from Stage I (Pressurized Heavy Water Reactors (PHWRs)) to Stage II of its nuclear programme, addressing uranium scarcity and enabling long-term thorium utilisation.

    What is Criticality with respect to a nuclear reactor?

    1. Criticality is the state in which a nuclear reactor sustains a stable, self-sustaining fission chain reaction. 
    2. Achieving this milestone, often termed “going critical,” means the reactor produces enough neutrons to maintain the reaction, a key step in nuclear power generation.
    3. Recently, India’s Prototype Fast Breeder Reactor at Kalpakkam achieved this, using plutonium to generate more fuel than it consumes.
    4. Reactor Stages:
      1. Subcritical: Chain reaction is not self-sustaining.
      2. Critical: Chain reaction is stable and self-sustaining.
      3. Supercritical: Chain reaction rate is increasing.
    5. Significance: It is the crucial startup phase before the reactor produces power for the grid.

    What is the significance of achieving ‘criticality’ in PFBR?

    1. Self-sustaining Chain Reaction: Indicates that nuclear fission becomes stable and continuous without external neutron input.
    2. Operational Milestone: Marks transition from construction to functional testing phase before commercial operation.
    3. Strategic Progression: Enables movement to Stage II of India’s nuclear programme.
    4. Not Full Operation: Does not imply electricity generation at full capacity; requires further testing and regulatory clearance.

    What are conventional Pressurised Heavy Water Reactors (PHWRs) and what are their limitations?

    1. Pressurised Heavy Water Reactor uses heavy water (deuterium oxide) as moderator and coolant.
    2. Fuel Base: Uses natural uranium (U-238 with ~0.7% U-235) without enrichment.
    3. Working Principle: Heavy water slows neutrons, enabling fission of U-235.
    4. Limited Fuel Efficiency: Only ~1% of fuel undergoes fission; large portion remains unused.
    5. Waste Generation: Produces plutonium as by-product, requiring reprocessing infrastructure.
    6. Resource Constraint: Depends on limited domestic uranium reserves.
    7. Example: India’s existing nuclear fleet largely consists of PHWRs forming Stage I of the programme. 

    How do Fast Breeder Reactors function differently from PHWRs?

    1. Fuel Composition: Uses plutonium-239 and uranium-238 (MOX fuel) instead of natural uranium.
    2. Breeding Capability: Produces more fissile material (plutonium) than consumed.
    3. Fast Neutrons: Operates without moderators; uses fast neutrons for fission.
    4. Coolant System: Uses liquid sodium instead of water; improves heat transfer but increases safety complexity.
    5. Efficiency: Higher fuel efficiency compared to PHWRs where only ~1% fuel undergoes fission. FBRs extract up to 100 times more energy from uranium than conventional pressurized heavy water reactors (PHWRs).

    Why are FBRs central to India’s three-stage nuclear programme?

    1. Stage I (PHWRs): Generates plutonium from natural uranium.
    2. Stage II (FBRs): Uses plutonium to produce more plutonium and uranium-233.
    3. Stage III (Thorium Reactors): Utilises uranium-233 derived from thorium.
    4. Resource Optimization: Addresses India’s limited uranium and abundant thorium reserves (~25% of global thorium).
    5. Energy Security: Ensures long-term sustainability and reduces import dependence.

    What challenges constrain the deployment of Fast Breeder Reactors?

    1. Technological Complexity: Requires precise control of fast neutron reactions and sodium coolant systems.
    2. Safety Risks: Sodium reacts violently with air and water, necessitating advanced containment systems.
    3. Economic Viability: High capital cost and long gestation periods reduce competitiveness.
    4. Global Experience: Japan’s Monju reactor shut down; France’s Superphénix decommissioned.
    5. Public Acceptance: Concerns over safety and nuclear waste management.
    6. Institutional Issues: Delays linked to centralized decision-making and weak accountability mechanisms.

    How has India pursued its Fast Breeder Reactor programme?

    1. Institutional Framework: Department of Atomic Energy (DAE) leads programme with centralized authority.
    2. Long-term Commitment: Development spanning over two decades despite delays.
    3. Indigenous Capability: Designed by Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam.
    4. Strategic Insulation: Programme insulated from public scrutiny, ensuring continuity across governments.
    5. Infrastructure Gaps: Limited fuel reprocessing and fabrication facilities.

    What lies ahead for PFBR and India’s nuclear energy strategy?

    1. Testing Phase: Operation at low power to assess reactor behaviour.
    2. Regulatory Approval: Clearance required from Atomic Energy Regulatory Board (AERB).
    3. Commercialisation: Transition to grid-based electricity generation.
    4. Fuel Cycle Development: Expansion of reprocessing and fuel fabrication infrastructure.
    5. Scaling Up: Potential deployment of more FBRs based on performance.
    6. Thorium Transition: Enables eventual shift to Stage III reactors. 

    Conclusion

    PFBR criticality marks a transition in India’s nuclear trajectory toward advanced fuel cycles and thorium utilisation. However, economic feasibility, safety assurance, and institutional efficiency remain key determinants of scalability.

    PYQ Relevance

    [UPSC 2018] With growing energy needs should India keep on expanding its nuclear energy programme? Discuss the facts and fears associated with nuclear energy

    Linkage: This question directly aligns with the PFBR development as it reflects India’s push toward advanced nuclear technologies for energy security. The article’s discussion on FBR advantages (fuel efficiency, thorium use) and concerns (cost, safety, viability) maps precisely onto the “facts vs fears” dimension of the PYQ.

  • Indian Scientists Develop New Method to Measure Distances in Deep Space

    Why in the News?

    Indian astronomers, including researchers from IIT Kanpur, have developed a new technique to measure distances in space using pulsars by combining dispersion measure and scatter broadening.

    What are Pulsars?

    • Pulsars are dense, rapidly spinning neutron stars
    • Emit regular radio wave pulses
    • Act as cosmic clocks due to highly stable rotation
    • Used to detect gravitational waves and deep space phenomena

    New Measurement Method

    Scientists combined two effects:

    1. Dispersion Measure (DM)

    • Radio waves pass through ionised gas
    • Lower frequency waves arrive later
    • Used to estimate distance

    2. Scatter Broadening

    • Plasma irregularities scatter signals
    • Signals follow multiple paths
    • Causes signal stretching

    New Approach

    • Combined Dispersion + Scattering
    • Improves accuracy of distance measurement

    Study Details

    • Observed 10 pulsars
    • Region studied: Gum Nebula
    • Found Vela Pulsar located behind nebula
    • Developed improved electron distribution model

    Significance

    • More accurate deep space distance measurement
    • No strict distance limitation
    • Can be used for Fast Radio Bursts (FRBs)
    • Improves understanding of interstellar medium
    [2023] Consider the following pairs: Objects in space : Description 
    1 Cepheids : Giant clouds of dust and gas in space 
    2 Nebulae : Stars which brighten and dim periodically 
    3 Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse 
    How many of the above pairs are correctly matched? 
    (a) Only one (b) Only two (c) All three (d) None

  • India Withdraws Bid to Host COP 33 in 2028

    Why in the News?

    India has withdrawn its bid to host COP 33 in 2028, according to reports.
    India had earlier expressed interest at COP 28 (Dubai, 2023).

    Key Points

    • COP 33 scheduled for 2028
    • India withdrew after review of commitments
    • No official government statement yet
    • South Korea now only country interested

    COP Hosting Rotation

    COP hosting rotates among 5 UN regional groups:

    • African States
    • Asia Pacific States
    • Eastern European States
    • Latin America & Caribbean
    • Western Europe & Others

    India belongs to Asia Pacific group.

    Upcoming COPs

    • COP 30: Brazil
    • COP 31: Turkey & Australia
    • COP 32 (2027): Ethiopia
    • COP 33 (2028): To be decided

    India’s COP Hosting History

    • India hosted COP 8 (2002)
    • Only time India hosted COP

    India’s Climate Commitments (Updated NDCs)

    By 2035, India aims to:

    • 60% electricity from non fossil sources
    • Reduce emissions intensity by 47%
    • Increase carbon sink by 3.5 to 4 billion tonnes CO₂

    What is COP

    COP = Conference of Parties

    • Annual UN climate summit
    • Under UNFCCC
    • Discuss climate change policies
    [2025] Consider the following statements:
    Statement I: At the 28th United Nations Climate Change Conference (COP28), India refrained from signing the ‘Declaration on Climate and Health’.
    Statement II: The COP 28 Declaration on Climate and Health is a binding declaration; and if signed, it becomes mandatory to decarbonize health sector.
    Statement III: If India’s health sector is decarbonized, the resilience of its healthcare system may be compromised.
    Which one of the following is correct in respect of the above statements?
    (a) Both Statement II and Statement III are correct and both of them explain Statement I (b) Both Statement II and Statement III are correct but only one of the them explains Statement I (c) Only one of the Statements II and III is correct and that explains Statement I (d) Neither Statement II nor Statement III is correct

  • Record Space Activity in 2025: ISSAR Report

    Why in the News?

    The Indian Space Situational Assessment Report (ISSAR) 2025 revealed 315 global space launches in 2025, placing 4,651 objects into orbit.

    Global Space Activity 2025

    • Total launches: 315
    • Objects placed in orbit: 4,651
    • Objects re entered atmosphere: 1,911
    • Net growth in space objects: 74.5%

    India’s Space Assets

    Satellites

    • Total Indian satellites in orbit: 86
      • Operational: 27
      • Defunct: 23
      • Decayed: 36
    • Indian satellites launched in 2025: 8

    Rocket Bodies

    • 4 rocket bodies placed in orbit
    • 12 Indian objects re entered atmosphere
    [2022] Which one of the following statements best reflects the idea behind the “Fractional Orbital Bombardment System” often talked about in media?
    (a) A hypersonic missile is launched into space to counter the asteroid approaching the Earth and explode it in space.
    (b) A spacecraft lands on another planet after making several orbital motions.
    (c) A missile is put into a stable orbit around the Earth and deorbits over a target on the Earth.
    (d) A spacecraft moves along a comet with the same speed and places a probe on its surface.

  • On India’s updated climate pledges

    Why in the News?

    India has updated its Nationally Determined Contributions (NDCs) under the Paris Agreement, signalling continuity in climate ambition while exposing tensions between developmental needs and decarbonisation pressures. The revision raises critical questions on feasibility, equity, and financing, especially for a lower-middle-income economy navigating industrial expansion.

    What are the key enhancements in India’s updated NDCs?

    1. Emission Intensity Reduction: Targets reduction of 47% below 2005 levels by 2035, increasing ambition beyond earlier 45% by 2030.
    2. Non-Fossil Capacity Expansion: Ensures 60% installed electric capacity from non-fossil sources, strengthening renewable transition.
    3. Carbon Sink Expansion: Enhances forest and tree cover to create 3.5-4 billion tonnes CO₂ equivalent sink.
    4. Continuity in Policy: Retains alignment with earlier commitments while incrementally increasing ambition.

    Why are India’s climate commitments structurally constrained?

    1. Developmental Status: Reflects lower-middle-income economy, limiting fiscal and technological capacity.
    2. Energy Demand Growth: Ensures rising demand due to industrial expansion and urbanisation.
    3. Per Capita Emissions: Remains one-third of global average, reinforcing equity argument.
    4. Historical Responsibility: Highlights minimal contribution compared to developed countries.

    What are the major implementation challenges in achieving NDC targets?

    1. Storage Constraints: Limits renewable scalability due to lack of battery storage capacity.
    2. Grid Integration Issues: Creates challenges in balancing intermittent sources like solar and wind.
    3. Transmission Bottlenecks: Restricts evacuation of renewable energy from generation sites.
    4. Financial Burden: Requires large-scale investments, e.g., battery storage expansion needing ~₹3 lakh crore.
    5. Operational Costs: Increases costs due to backup fossil-based power for intermittency.

    Does renewable energy expansion fully address India’s climate goals?

    1. Intermittency Challenge: Reduces reliability due to solar/wind variability.
    2. Curtailment Risk: Leads to underutilisation of installed RE capacity.
    3. Cost-effectiveness Debate: Questions viability when storage and backup costs are included.
    4. Hydropower Constraints: Limits expansion due to environmental and regulatory challenges.

    How does global climate ambition interact with India’s development needs?

    1. 1.5°C Target Pressure: Requires deeper cuts beyond current NDC trajectory.
    2. Equity Principle: Demands consideration of common but differentiated responsibilities (CBDR).
    3. Industrial Growth Needs: Necessitates expansion in manufacturing and infrastructure sectors.
    4. Urbanisation Demand: Increases energy consumption due to rising living standards.

    What are the financial and institutional gaps in India’s climate strategy?

    1. Climate Finance Deficit: Limits implementation due to lack of adequate global funding.
    2. Technology Access Barriers: Restricts adoption of advanced clean technologies.
    3. Institutional Coordination: Creates challenges across sectors like energy, transport, and industry.
    4. Global Cooperation Gaps: Weakens support due to inadequate commitments by developed nations.

    Should India increase its climate ambition further?

    1. Feasibility Concerns: Questions practicality given structural constraints.
    2. Cost Implications: Raises economic burden without assured external support.
    3. Strategic Positioning: Suggests calibrated approach using “national circumstances” principle.
    4. Global Inequity: Highlights disproportionate burden-sharing by developing countries. 

    Conclusion

    India’s updated NDCs reflect a calibrated balance between climate responsibility and developmental priorities. While ambition has increased, structural constraints in finance, technology, and energy systems necessitate a cautious approach. Future climate action must align with equity, global support, and domestic growth imperatives.

    PYQ Relevance

    [UPSC 2022] Discuss global warming and mention its effects on the global climate. Explain the control measures to bring down the level of greenhouse gases which cause global warming, in the light of the Kyoto Protocol, 1997.

    Linkage: The question directly links to India’s updated NDCs as both focus on reducing greenhouse gas emissions through global commitments and national targets under UNFCCC frameworks. It is relevant as it helps analyze how India balances emission reduction obligations (Kyoto/Paris) with developmental priorities, as highlighted in the article.

  • Kalpakkam: ‘Critical’ step in 3-stage nuclear programme

    Why in the News?

    India’s Kalpakkam Fast Breeder Reactor has achieved criticality, marking the first time the country has operationalized the second stage of its three-stage nuclear programme. This is significant because it enables production of more fuel than consumed, overcoming uranium scarcity and unlocking India’s vast thorium reserves.

    What is the significance of achieving ‘criticality’ in a Fast Breeder Reactor?

    1. Criticality Achievement: Ensures initiation of a self-sustaining nuclear fission chain reaction; marks transition from testing to operational stage.
    2. Fuel Multiplication: Produces more fissile material (Pu-239) than consumed, unlike conventional reactors; enables long-term sustainability.
    3. Strategic Breakthrough: Establishes India among a limited group of nations with operational breeder technology.
    4. Example: Kalpakkam 500 MWe Prototype Fast Breeder Reactor (PFBR) reaching criticality.

    How does this advance India’s three-stage nuclear programme?

    1. Stage-I (Pressurized Heavy Water Reactors (PHWRs)): Utilizes natural uranium; generates plutonium as by-product.
    2. Stage-II (Fast Breeder Reactors (FBRs)): Uses plutonium fuel; converts fertile U-238 into fissile Pu-239.
    3. Stage-III (Thorium Cycle): Uses U-233 derived from thorium; ensures long-term energy security.
    4. Continuity Link: FBR acts as a bridge between uranium and thorium economy.

    Why are Fast Breeder Reactors crucial for India’s energy security?

    1. Resource Constraint: India has limited uranium but abundant thorium reserves (~25% of world total).
    2. Energy Expansion Target: Increases nuclear capacity from 8,180 MWe to 22,480 MWe by 2032.
    3. Fuel Efficiency: Enhances energy output by over 60 times compared to natural uranium use in PHWRs.
    4. Reduced Import Dependence: Minimizes reliance on imported enriched uranium.

    What are the technological and operational features of the Kalpakkam PFBR?

    1. Capacity: 500 MWe prototype reactor.
    2. Fuel Type: Mixed Oxide Fuel (MOX) containing plutonium and uranium.
    3. Breeding Mechanism: Uses U-238 blanket to produce Pu-239.
    4. Coolant: Liquid sodium used due to high thermal conductivity and low neutron absorption.
    5. Example: Construction began decades ago; core loading completed in 2024.

    What are the global comparisons and challenges associated with FBRs?

    1. Limited Global Success: Countries like Japan, France, and the US shut down FBRs due to safety and economic concerns.
    2. Safety Concerns: Sodium coolant reacts violently with air/water; requires advanced containment systems.
    3. Cost Constraints: High capital costs and long gestation periods.
    4. India’s Position: Becomes second country after Russia to have a commercial FBR.

    How does this development accelerate the thorium-based third stage?

    1. Fuel Conversion: Converts thorium (Th-232) into fissile U-233.
    2. Inventory Build-Up: Ensures sufficient plutonium and U-233 for sustained thorium cycle.
    3. Strategic Timeline: Reduces delay in transitioning to thorium reactors.
    4. Example: FBR enables faster accumulation of fissile material required for advanced heavy water reactors (AHWRs).

    Conclusion

    The Kalpakkam breakthrough operationalizes a decades-old vision of self-reliant nuclear energy. It transforms India’s nuclear trajectory from resource-constrained to resource-optimized. Sustained investments, safety assurances, and technological scaling remain critical for full realization.

    PYQ Relevance

    [UPSC 2017] Give an account of the growth and development of nuclear science and technology in India. What is the advantage of the fast breeder reactor programme in India?

    Linkage: The question directly tests India’s indigenous nuclear capability, including the three-stage programme. The Kalpakkam Fast Breeder Reactor achieving criticality provides a contemporary example to substantiate advantages of FBRs in ensuring fuel sustainability, thorium utilization, and long-term energy independence.

  • Indian Softshell Turtle Rescued in Greater Noida

    Why in the News?

    Police in Greater Noida rescued 16 Indian Softshell Turtles from smugglers. The species is protected under Schedule I of Wildlife Protection Act.

    About Indian Softshell Turtle

    • Scientific Name: Nilssonia gangetica
    • Also called: Gangetic Softshell Turtle
    • Type: Freshwater turtle
    • Family: Trionychidae (soft shelled turtles)

    Conservation Status

    • IUCN Status: Endangered
    • Wildlife Protection Act 1972: Schedule I
    • CITES: Appendix I

    Habitat & Distribution

    • Found in river systems: Ganga, Indus, and Mahanadi
    • Countries: India, Pakistan, Nepal, and Bangladesh
    • Habitat: Deep rivers, Lakes, Canals, and Muddy riverbeds

    Key Features

    • Leathery soft shell
    • Olive green colour
    • Long snorkel like nose
    • Size up to 94 cm
    • Omnivorous scavenger

    Why Smuggled

    • Myth of 20 claws brings good luck
    • Used in illegal wildlife trade
    • False medicinal beliefs
    [2017] In India, if a species of tortoise is declared protected under Schedule I of the Wildlife (Protection) Act, 1972, what does it imply? 
    (a) It enjoys the same level of protection as the tiger. 
    (b) It no longer exists in the wild, a few individuals are under captive protection; and now it is impossible to prevent its extinction. 
    (c) It is endemic to a particular region of India. 
    (d) Both (b) and (c) stated above are correct in this context.