Relevance: GS-3 (Science & Technology, Infrastructure, & Environment) | Source: Indian Express

1. The Core News: A Major Energy Shift

To clean up its energy grid, the Government of India has shortlisted three ageing coal-fired thermal power plants.

• The Plan: Instead of shutting these old plants down completely, the government will rebuild these sites as brand-new nuclear power facilities.
• The Goal: This is a strategic move to help India rapidly jump from its current nuclear capacity of 8.8 GWe to 100 GWe by 2047.

2. Why Repurpose Old Coal Plants? (Administrative Logic)

Building a new power plant on empty land (a Greenfield project) takes years of fighting for land acquisition and environmental clearances. Upgrading old sites (Brownfield projects) offers huge advantages:

• Ready Infrastructure: Finding massive blocks of land and securing heavy water supply are the biggest headaches for nuclear plants. Old thermal sites already have land, water connections, and power grid wires in place.
• Meeting Climate Goals: Replacing highly polluting coal with clean nuclear energy directly fulfills India’s Panchamrit promise made at COP26 (achieving Net-Zero emissions by 2070).

3. The Main Hurdle: The “Exclusion Zone” Rule

While the land is ready, administrators face a strict safety bottleneck:

• The 1-km Rule: In India, nuclear reactors must have a strict Exclusion Zone of a 1-kilometer radius. Absolutely no human living or commercial activity is allowed inside this circle.
• The Ground Reality: Over the last 40 years, villages and families have unknowingly encroached (moved into) the areas right next to these old coal plants.
• The SMR Solution: To solve this without displacing poor families, the government is considering using Small Modular Reactors (SMRs). Because SMRs are much smaller and inherently safer, regulators might allow a smaller, relaxed exclusion zone (like 700 meters).

4. Prelims Essential: India’s 3-Stage Nuclear Programme

To understand India’s nuclear dream, you must memorize Dr. Homi Bhabha’s famous 3-stage plan, designed to make India energy-independent using our vast Thorium reserves:

• Stage 1: Pressurized Heavy Water Reactors (PHWRs)
  • Fuel Used: Natural Uranium.
  • Coolant: Heavy Water.
  • Output: Produces power and a leftover byproduct called Plutonium-239. (India is currently mostly in this stage).
• Stage 2: Fast Breeder Reactors (FBRs)
  • Fuel Used: Plutonium-239 (from Stage 1) mixed with depleted Uranium.
  • The Magic: It “breeds” (creates) more nuclear fuel than it consumes. Once it runs well, Thorium is added to convert it into new usable fuel (Uranium-233).
• Stage 3: Advanced Heavy Water Reactors (AHWRs)
  • Fuel Used: Uranium-233 and domestic Thorium.
  • Goal: A fully self-sustaining Thorium cycle, finally freeing India from having to import foreign nuclear fuel.

5. Key Laws and Bodies to Remember

• The SHANTI Act, 2025: A landmark new law that broke the total government monopoly. It now allows private companies to enter civil nuclear power operations and manage fuel, under strict state monitoring.
• AERB (Atomic Energy Regulatory Board): The strict “police” of the nuclear sector. They enforce radiation safety and the 1-km exclusion zone rules.
• NPCIL: A government company (under the Dept. of Atomic Energy) that actually builds and runs the nuclear reactors in India.

UPSC Value Box

• Base-load Power: The minimum level of electricity demand required over 24 hours. Nuclear and coal provide stable base-load power, unlike solar which fluctuates with the weather.
• Greenfield vs. Brownfield: Greenfield means building a project on completely new, untouched land. Brownfield means upgrading or building on an existing, previously used industrial site.
• SMR (Small Modular Reactor): Advanced nuclear reactors that are smaller, cheaper to build, and can be assembled in factories and transported to a site.

With reference to India’s civil nuclear energy sector and the 3-Stage Nuclear Programme, consider the following statements:

1. In the first stage (PHWRs), Natural Uranium is used as fuel and Heavy Water ($D_2O$) is used as a moderator.
2. The primary objective of the third stage is to achieve a self-sustaining nuclear fuel cycle utilizing India’s vast reserves of Thorium.
3. The SHANTI Act, 2025 completely prohibits private sector participation in the operational aspects of civil nuclear power plants.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2, and 3

Correct Answer: (a) 1 and 2 only