PROTOTYPE FAST BREEDER REACTOR

• On 6 April 2026, India achieved a major milestone when the Prototype Fast Breeder Reactor (PFBR) attained first criticality.
• The reactor is located at Kalpakkam, Tamil Nadu and has a capacity of 500 MWe (Megawatt electrical).
• It has been built by Bharatiya Nabhikiya Vidyut Nigam Limited.
• This event marks:
  • The beginning of a sustained nuclear chain reaction
  • India’s entry into Stage 2 of its nuclear programme

This is a historic development in India’s nuclear energy programme and clean energy transition

WHAT IS FIRST CRITICALITY?

• Criticality refers to the stage when a self-sustaining nuclear chain reaction begins inside a reactor.
• At this point:
  • Neutrons produced = neutrons consumed
  • The reactor becomes operational at basic level

It is the first and most important milestone before full power generation

GLOBAL SIGNIFICANCE

• Once fully operational, India will become:
  • The second country in the world after Russia to operate a commercial Fast Breeder Reactor (FBR)

This gives India a strategic and technological advantage in nuclear energy

THREE STAGES OF INDIA’S NUCLEAR PROG

THE THREE STAGES

Stage 1: Pressurised Heavy Water Reactors (PHWRs)

• Fuel used: Natural Uranium
• Output:
  • Generates electricity
  • Produces Plutonium (Pu-239) as by-product

This plutonium is used in Stage 2 Stage 2: Fast Breeder Reactors (FBRs)

• Fuel used:
  • Plutonium from Stage 1
• Key Feature:
  • These reactors produce more fuel than they consume
• The PFBR at Kalpakkam marks India’s entry into this stage

It also helps in producing Uranium-233 from Thorium Stage 3: Thorium-Based Reactors

• Fuel:
  • Uranium-233 (derived from Thorium)
• Importance:
  • India has large thorium reserves

This stage will ensure long-term sustainable energy supply Overall Concept

• The programme follows a closed nuclear fuel cycle

Meaning:

• Waste fuel is reprocessed and reused

VISION BEHIND INDIA’S NUCLEAR PROGRAM

• The three-stage nuclear programme was designed by Homi Jehangir Bhabha
• It is based on:
  • Limited uranium reserves in India
  • Abundant thorium reserves

The aim is to achieve:

• Energy security
• Self-reliance in nuclear fuel

PFBR: DETAILED OVERVIEW

Development

• Developed by Indira Gandhi Centre for Atomic Research
• Operated by Bharatiya Nabhikiya Vidyut Nigam Limited

Fuel Type

• Uses MOX Fuel (Mixed Oxide Fuel)
• Composition:
  • Uranium + Plutonium
• Source:
  • Reprocessed fuel from PHWRs

Breeder Concept

• Core is surrounded by Uranium-238 blanket
• Process:
  • Fast neutrons convert U-238 → Plutonium-239

This allows the reactor to:

• Generate more fuel than it consumes

BRIDGE TO STAGE 3

• PFBR can use Thorium-232 in future
• Conversion:
  • Thorium ? Uranium-233

This is crucial for Stage 3 (thorium-based reactors) Closed Fuel Cycle

• Spent fuel is:
  • Reprocessed
  • Recycled back into reactor

This ensures:

• Maximum utilization of nuclear resources
• Minimum waste

CURRENT NUCLEAR POWER STATUS IN INDIA

• Installed Capacity:
  • Around 8.78 GW
• Electricity Generation (2024–25):
  • 56,681 Million Units
• Share in Total Electricity:
  • Around 3.1%

Nuclear power currently plays a small but stable role

FUTURE EXPANSION PLANS

• India plans to increase capacity to:
  • 22.38 GW by 2031–32
• Development includes:
  • 700 MW indigenous reactors
  • 1000 MW reactors with international cooperation

International Cooperation

• India has signed agreements with:
  • 18 countries for civil nuclear cooperation

This reflects global trust in India’s nuclear programme

LONG TERM NUCLEAR ENEGY MISSION

• Announced in Union Budget 2025–26
• Target:
  • 100 GW nuclear capacity by 2047
• Linked to:
  • Net Zero target by 2070

KEY MEASURES

Financial Investment

• Allocation of Rs 20,000 crore
• Focus on:
  • Small Modular Reactors (SMRs)

SMR Development

• Target:
  • At least 5 SMRs by 2033
• Designs by Bhabha Atomic Research Centre:
  • BSMR-200 (200 MWe)
  • SMR-55 (55 MWe)
  • High-Temperature Gas Reactor (for hydrogen production)

Legal Reform

• Introduction of SHANTI Act, 2025
• Features:
  • Modernises nuclear laws
  • Allows limited private sector participation
  • Ensures regulatory oversight

SIGNIFICANCE OF PFBR ACHIEVEMENT

Energy Security

• Reduces dependence on imported fuels

Clean Energy Transition

• Nuclear energy is:
  • Low-carbon
  • Reliable

Supports climate goals Technological Advancement

• Demonstrates indigenous capability

Strategic Importance

• Positions India among advanced nuclear nations

CHALLENGES

• High cost of nuclear infrastructure
• Safety and waste management concerns
• Need for strong regulatory mechanisms
• Public perception and acceptance issues

CONCLUSION

• The achievement of first criticality of PFBR marks a turning point in India’s nuclear journey
• It shows:
  • Progress from planning to implementation
  • Strength of indigenous scientific capability
• With expansion and policy support, nuclear energy will play a larger role in India’s future energy mix