The Prototype Fast Breeder Reactor (PFBR) built in Kalpakkam, Tamil Nadu has proved to be a milestone for India’s nuclear energy programme. This reactor has recently achieved criticality. This means that the nuclear chain reaction has started successfully. This means the process in which parts of an atom i.e. neutrons collide with another atom and produce energy. When this process starts happening one after the other continuously, it is called series reaction. In simple words, it produces the heat required to generate electricity. This is being considered a historic milestone in India’s nuclear journey.
Work on this 500 MW power capacity reactor of Kalpakkam started in 2004. At that time it was expected that this project would be completed within a few years. But due to technical challenges, safety precautions, complexity of equipment and delays, it took 22 years to complete. But on the lines of better late than never, this is an important milestone for India.
Now that this unit has started its work, it is important to know what this new achievement of Kalpakkam means for the country? What is the next goal now? What will be the benefits of the new achievement and what is its importance for the country?
When was the foundation laid?
The prototype fast breeder reactor of Kalpakkam is a historic turning point in India’s nuclear journey. Work on this started in 2004. Now it has achieved criticality. This is an indication that India’s second phase nuclear program is moving forward. Now the aim is to run it at full capacity and produce electricity. This can provide huge benefits like energy security, fuel efficiency, thorium based future and technological self-reliance. The cost may have increased, but its strategic value and national importance is much greater. This achievement makes India stand among the very few countries in the world which are doing serious and successful work on future nuclear technology.
The prototype fast breeder reactor of Kalpakkam is a historic turning point in India’s nuclear journey.
What does the new achievement mean?
Achieving criticality is an important stage for any nuclear reactor. This means that the basic scientific structure of the reactor was successful. Now it has been proved that this system can work in a controlled manner. This is not the final destination yet, but it is the turning point from which the reactor moves towards commercial power generation.
This reactor is not like an ordinary nuclear reactor. This is a fast breeder reactor. Its special quality is that it has the ability to produce more useful nuclear fuel than the fuel it consumes, that is why it is called a breeder. This is the second phase of India’s three-phase nuclear program.
India has limited uranium, but has huge reserves of thorium.
What is the next goal now?
Now the next goal is to gradually take this reactor to full power. After this, it will have to be connected to the grid and brought into regular power production. Scientists have decided that work is going on to move it towards full operation this year itself. The long-term goal of this project is even bigger.
India has limited uranium, but has huge reserves of thorium. India’s nuclear program has been designed in such a way that first uranium is used, then fast breeder reactors are run using its products and finally thorium based energy system is developed. The achievement of Kalpakkam is a strong step towards that bigger national goal.
What benefit will the country get from this?
This new achievement can bring many big benefits to the country. India’s energy security will be strengthened. The country’s electricity requirement is increasing rapidly. Always relying on coal and oil is not a good option in the long run. Nuclear energy can provide electricity continuously and on a large scale. This technology makes better use of fuel. Fast breeder reactors are considered more efficient than normal reactors. They can also produce useful materials from used fuel. This will help India move towards a thorium-based future.
The country’s electricity needs are increasing rapidly and for this nuclear energy will prove to be a game changer.
This is a very special thing for India, because India is also included in the world’s largest thorium reserves. This can reduce dependence on foreign fuel. If India increases its domestic nuclear fuel capacity, its energy policy can become more self-reliant. This project increases high level science, engineering and manufacturing capacity. Such projects strengthen nuclear technology, special metals, security systems and advanced industrial skills in the country.
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
Which countries in the world have such projects?
Very few countries have fast breeder or fast neutron reactor. This technology is difficult and expensive. Currently, Russia, China and India are considered mainly active in this region. Russia is at the forefront in this field. It has reactors like BN-600 and BN-800, which have been running for a long time. China has moved forward with work on projects like CFR-600. India is now gaining a strong position in this select group through the prototype fast breeder reactor of Kalpakkam. Countries like Japan and France had also made such efforts earlier, but many projects were stopped or could not proceed. Therefore this success of India becomes even more important.
How much has it cost so far?
The initial cost of this project was estimated to be around Rs 3,492 crore. But due to delays and technical difficulties the cost increased significantly. According to recent reports, this cost has increased to approximately Rs 8,181 crore. This figure has also been confirmed in the report of the parliamentary committee.
How important is this project for the country?
Its importance for the country is very big. It would not be right to consider it only a power project. It is a symbol of India’s long-term strategic and scientific potential. This project shows that India is not only a consumer country of nuclear energy, but also a country developing complex nuclear technology. This achievement brings India into the ranks of select countries with advanced nuclear technology. This increases the scientific prestige of the country. Its importance is even greater because India needs clean, stable and large-scale energy in the coming decades. Solar and wind energy are important, but they are not available all the time.
Nuclear energy can provide stable supply. In such a situation, the Kalpakkam project can strengthen India’s energy mix. This is also important from strategic point of view. If India is successful in fast breeder and later thorium based system, it will be a different model for the world. This achievement is not just a need of today, but a preparation for the coming 30 to 50 years.
In this way, it can be said that the prototype fast breeder reactor of Kalpakkam is a historical turning point in India’s nuclear journey. Work on this started in 2004. Now it has achieved criticality. This is an indication that India’s second phase nuclear program is moving forward. Now the aim is to run it at full capacity and produce electricity. This can provide huge benefits like energy security, fuel efficiency, thorium based future and technological self-reliance. The cost may have increased, but its strategic value and national importance is much greater. This achievement makes India stand among the very few countries in the world which are doing serious and successful work on future nuclear technology.
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