Full formScience
HWRstands forHeavy Water Reactor
Full Form of HWR
What is HWR?
A Heavy Water Reactor (HWR) is a type of nuclear reactor that uses heavy water (deuterium oxide, D2O) as its moderator and coolant. Heavy water has a low neutron absorption cross-section, allowing the reactor to sustain a chain reaction using natural uranium as fuel, without the need for enrichment. In India, HWRs are the backbone of the country's nuclear power program, primarily in the form of Pressurized Heavy Water Reactors (PHWRs). The first Indian PHWR was built at the Rajasthan Atomic Power Station (RAPS) in 1973. Today, India operates multiple PHWRs of varying capacities, including the indigenously designed 700 MWe units at Kakrapar and Rawatbhata. These reactors are used by the Nuclear Power Corporation of India Limited (NPCIL) to generate about 2,300 MWe of electricity. Heavy water for these reactors is produced domestically by the Heavy Water Board. The HWR technology is central to India’s three-stage nuclear program, which aims to utilise thorium reserves. For competitive exams like UPSC and SSC, HWRs are a key topic in energy and science sections, highlighting India's self-reliance in nuclear technology.
HWR का फुल फॉर्म
भारी जल रिएक्टर
Example
The Kakrapar Atomic Power Station unit 3 is India's first indigenously developed 700 MWe Pressurized Heavy Water Reactor.
HWR — frequently asked questions
What is the full form of HWR?
The full form of HWR is Heavy Water Reactor, a nuclear reactor that uses heavy water (D2O) as its moderator and coolant.
What is the difference between HWR and PWR?
HWR uses heavy water as moderator while PWR uses ordinary light water; HWR can run on natural uranium whereas PWR usually requires enriched uranium. India primarily uses HWRs for its nuclear program.
Why does India use heavy water reactors?
India uses HWRs because they allow the use of natural uranium, which matches India’s limited uranium reserves and supports its three-stage nuclear program focused on thorium utilisation.