Why in News?
India’s pursuit of energy independence through thorium-based nuclear power critically depends on the scale-up of Pressurised Heavy Water Reactors (PHWRs), which form the backbone of India’s nuclear programme.
Description:
What is a PHWR?
A Pressurised Heavy Water Reactor (PHWR) is a nuclear reactor that uses natural uranium as fuel and heavy water (D₂O) as both moderator and coolant.
Role of PHWRs in India’s Nuclear Strategy:
- PHWRs generate Electricity (immediate output) and Plutonium-239 (strategic by-product)
- Plutonium produced in PHWRs is essential input for Stage II (Fast Breeder Reactors).
- Hence, PHWRs are the gateway to thorium utilisation.
Why Scaling Up PHWR Capacity Matters?
- India’s domestic uranium availability is limited.
- Earlier, PHWRs operated below optimal capacity due to fuel constraints.
- With international uranium access, PHWRs can now operate at high-capacity utilisation (~90%).
- Higher PHWR output → faster plutonium accumulation → accelerated transition to thorium cycle.
PHWRs and Thorium Transition:
- Direct use of thorium without sufficient plutonium is counter-productive.
- PHWR-generated plutonium enables Fast Breeder Reactors to produce U-233 and eventual deployment of thorium-based reactors (Stage III)
- Thus, PHWR expansion shortens the time horizon for thorium-based nuclear power.
Advanced Fuel Options in PHWRs:
- HALEU: High-Assay Low-Enriched Uranium (5–20% enriched uranium) can be used in PHWRs.
- Benefits: Improved fuel burn-up, Lower overall fuel cost, Reduced natural uranium requirement
- Enhances economic and operational efficiency of PHWRs.
Strategic Significance:
- PHWRs constitute the bulk of India’s installed nuclear capacity.
- Central to Three-stage nuclear programme and long-term thorium-based energy independence
- Enable a gradual, secure transition rather than disruptive change.
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