Indigenous heavy water reactors get licence
Relevance
GS Paper III – Science and Technology
GS Paper II – Governance
Context
In a major boost to India’s indigenous nuclear power programme, the Atomic Energy Regulatory Board (AERB) granted a 5-year operational licence to NPCIL for Kakrapar Atomic Power Station (KAPS) Units 3 and 4 in Gujarat. These are India’s first indigenously developed 700 MWe Pressurised Heavy Water Reactors (PHWRs).
Commissioning Milestones
- KAPS Unit-3: Achieved full power operation in August 2023.
- KAPS Unit-4: Reached full power commissioning in August 2024.
- Both reactors underwent commissioning under Phase-C, involving extensive safety and operational validation trials.
Rigorous Licensing and Safety Review
- AERB licensing included multi-tiered reviews across the nuclear reactor lifecycle:
➤ Siting → Design → Construction → Commissioning → Operation. - Reactor design evaluation spanned 15 years, involving:
- Technical support organizations
- Independent nuclear safety experts
- Safety and efficiency improvements:
- Earlier reactors: 15 PHWRs (220 MWe) + 2 PHWRs (540 MWe)
- Current upgrade: 540 MWe → 700 MWe
➤ Improves energy output, fuel efficiency, and safety margins.
What is a Pressurised Heavy Water Reactor (PHWR)?
- A PHWR is a type of nuclear reactor that uses:
- Natural (unenriched) uranium as fuel.
- Heavy water (D₂O) as both coolant and moderator.
- Key Features:
- Heavy water coolant under pressure → enables high-temperature operation without boiling.
- Does not require fuel enrichment facilities, making it cost-effective and strategically autonomous.
- Heavy water is expensive, but improves neutron economy significantly.
NPCIL’s Role and Future Plans
- NPCIL (Nuclear Power Corporation of India Ltd.):
➤ A public sector undertaking under the Department of Atomic Energy (DAE).
➤ Responsible for design, construction, and operation of nuclear power plants. - With this licensing success, NPCIL aims to construct 10 more 700 MWe PHWRs in fleet mode.
Fleet Mode Explained
- Fleet Mode Construction entails:
- Standardised design & modular construction
- Simultaneous reactor building at multiple sites
- Lowered construction cost & time
- Streamlined regulatory & administrative clearances
Atomic Energy Regulatory Board (AERB): India’s Nuclear Safety Authority
- Established: 1983 by Presidential order
- Legal Basis:
➤ Atomic Energy Act, 1962
➤ Environment (Protection) Act, 1986 - Mission:
➤ Ensure use of nuclear energy and ionizing radiation does not pose undue risks to health and the environment. - Role:
- Regulatory oversight of all stages: design, construction, commissioning, operation, and decommissioning of nuclear facilities.
Significance
- Marks a critical leap in India’s Atmanirbhar Bharat vision for nuclear energy.
- Strengthens India’s energy security and carbon-free power generation capacity.
- Aligns with India’s commitments under climate change goals and net-zero targets.
- Establishes India’s capability to design and operate high-capacity nuclear reactors without foreign technology dependence.
Conclusion
The operational licensing of India’s first indigenously developed 700 MWe Pressurised Heavy Water Reactors at Kakrapar, Gujarat, marks a critical milestone in the nation’s nuclear energy journey. It reflects the technological maturity, regulatory robustness, and strategic foresight of India’s atomic energy programme.
As NPCIL moves toward constructing additional reactors in fleet mode, India is not only enhancing its clean energy capacity but also strengthening its position as a global leader in indigenous nuclear technology. This aligns seamlessly with the vision of Atmanirbhar Bharat, the targets of energy self-sufficiency, and the long-term goal of achieving sustainable development with minimal environmental impact.
