Prime Minister Narendra Modi on Monday lauded India’s first indigenous Prototype Fast Breeder Reactor at Kalpakkam for attaining criticality, calling it a “defining step in India’s civil nuclear journey.” In a post on X, the PM reflected on the strengths of the reactor and recognized this as a “decisive step towards harnessing our vast thorium reserves.”
Expressing pride over the achievement, the PM congratulated the scientists and engineers involved in the programme. “Today, India takes a defining step in its civil nuclear journey, advancing the second stage of its nuclear programme. The indigenously designed and built Prototype Fast Breeder Reactor at Kalpakkam has attained criticality,” the PM wrote.
Today, India takes a defining step in its civil nuclear journey, advancing the second stage of its nuclear programme.
The indigenously designed and built Prototype Fast Breeder Reactor at Kalpakkam has attained criticality.
This advanced reactor, capable of producing more fuel…
— Narendra Modi (@narendramodi) April 6, 2026
What Is the Prototype Fast Breeder Reactor?
The PFBR is an advanced nuclear reactor capable of producing more fuel than it consumes. This unique feature makes it a “breeder” reactor. It will initially use Uranium-Plutonium Mixed Oxide fuel. The Uranium-238 “blanket” surrounding the fuel core will undergo nuclear transmutation to produce more fuel, earning it the name ‘breeder’.
The use of Thorium-232, which itself is not a fissile material, as a blanket is also envisaged in this stage. By transmutation, thorium will create fissile Uranium-233, which will be used as fuel in the third stage of India’s nuclear programme.
Why Is This Achievement Significant for India?
Once commissioned, India will become only the second country after Russia to have a commercial operating Fast Breeder Reactor. An official release stated that India has developed comprehensive capabilities spanning the entire spectrum of the nuclear fuel cycle.
In line with the true spirit of Aatmanirbhar Bharat, the PFBR has been fully designed and constructed indigenously by BHAVINI with significant contributions from more than 200 Indian industries, including MSMEs. The government had approved in 2003 the creation of Bhartiya Nabhikiya Vidyut Nigam Ltd to construct and operate India’s most advanced nuclear reactor.
What Are the Safety Features of the PFBR?
The PFBR is a sophisticated third-generation reactor with built-in passive safety mechanisms. In the case of an emergency, these features guarantee a quick and secure shutdown of the facility. The reactor’s design prioritizes safety without relying on active systems that could fail.
How Does the PFBR Fit Into India’s Three-Stage Nuclear Programme?
The Fast Breeder Reactor is a stepping stone for the third stage of India’s nuclear programme. Fuel is produced from uranium-238 using FBRs in the second stage. India’s large thorium stocks will be used in the third stage. India can access its abundant thorium resources for energy security by converting thorium-232 into fissile uranium-233.
India has one of the world’s largest thorium reserves, making the successful development of breeder reactor technology a strategic priority for long-term energy independence.
What Did PM Modi Say About the Achievement?
“A proud moment for India. Congratulations to our scientists and engineers,” the PM wrote. In 2024, PM Modi witnessed the commencement of “core loading” at the PFBR, taking a tour of the reactor vault and the control room. He was briefed about the salient features of the facility.
According to the PM’s post, this cutting-edge reactor “reflects the depth of our scientific competence and the strength of our engineering sector.”
FAQs: India’s Fast Breeder Reactor
Q: What is a Fast Breeder Reactor?
A: A nuclear reactor that transforms non-fissile material into fissile material in order to create more fuel than it uses.
Q: Where is the PFBR located?
A: Kalpakkam, Tamil Nadu.
Q: When did it attain criticality?
A: April 6, 2026.
Q: Which other country has a commercial FBR?
A: Russia.
Q: What fuel will the PFBR use initially?
A: Uranium-Plutonium Mixed Oxide fuel.
Q: Why is thorium important for India?
A: India has enormous supplies of thorium. For third-stage fuel, the PFBR will assist in converting thorium into fissile uranium-233.
Q: What are the safety features?
A: Passive safety features that ensure prompt and safe shutdown during emergencies.
Disclaimer: This information is based on inputs from news agency reports. TSG does not independently confirm the information provided by the relevant sources.
