Relevance: GS III (Science & Technology, Energy Security) | Source: The Indian Express

1. What happened?

India’s very first home-made 500 MWe Fast Breeder Reactor (FBR) at Kalpakkam (Tamil Nadu) has successfully reached “criticality.” *

• Meaning: “Criticality” means the reactor has safely started a continuous, controlled nuclear fire and is now ready to produce electricity.
• With this, India becomes only the second country in the world (after Russia) to successfully run a commercial FBR.

2. What is a “Breeder” Reactor?

A normal nuclear reactor simply burns up its fuel. But an FBR is highly advanced—it produces more nuclear fuel than it consumes!

• The Fuel: It uses a special Mixed Oxide (MOX) fuel, which is a mix of Uranium and Plutonium.
• The Magic Process (Transmutation): The main fire (core) is covered with a “blanket” of normal, non-fissile Uranium-238. As the reactor makes electricity, it throws out extra energy (neutrons) that hits this blanket. This hit chemically changes the useless Uranium-238 into highly valuable Plutonium-239.
• The Result: We get clean electricity, plus fresh Plutonium to run future reactors!

3. India’s 3-Stage Master Plan

Dr. Homi Bhabha designed a 3-step master plan. The ultimate dream is to use India’s massive reserves of Thorium to achieve total energy independence.

• Stage 1 (Normal Reactors): Currently running successfully. They use natural Uranium to make electricity and leave behind Plutonium as waste.
• Stage 2 (Fast Breeder Reactors): (We just achieved this!) The FBR takes the waste Plutonium from Stage 1, burns it to make electricity, and “breeds” even more fuel.
• Stage 3 (Thorium Reactors): The future goal. The fuel created in Stage 2 will finally be used to burn Thorium, giving India centuries of clean energy and helping us reach Net-Zero emissions by 2070.

The “UPSC Trap”

• The “Thorium Fuel” Trap: UPSC will try to trick you by saying, “The newly critical Fast Breeder Reactor at Kalpakkam uses Thorium as its main fuel.” Incorrect. The FBR strictly uses a Mixed Oxide (MOX) fuel of Uranium and Plutonium. Thorium will only be used in the future Stage 3.
• The “First Country” Trap: A statement might claim India is the first country to successfully run a commercial FBR. Incorrect. India is second; Russia did it first.

UPSC Value Box

With reference to India’s Three-Stage Nuclear Programme and the Fast Breeder Reactor (FBR), consider the following statements:

1. The Fast Breeder Reactor at Kalpakkam primarily utilizes Thorium-232 to achieve criticality in its reactor core.
2. A unique characteristic of a Fast Breeder Reactor is its ability to produce more fissile nuclear fuel than it consumes via nuclear transmutation.
3. Bharatiya Nabhikiya Vidyut Nigam Ltd (BHAVINI) is the nodal public sector enterprise responsible for the construction and operation of Fast Breeder Reactors in India.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 2 and 3 only

(c) 3 only

(d) 1, 2 and 3

Correct Answer: (b)