Science & TechnologyImportant2026-02-10

RAPP-7 Reactor Achieves Full Power

In News

What Happened

On February 10, 2026, the Nuclear Power Corporation of India Limited (NPCIL) successfully achieved the rated full power operation of 700 MW at the Rajasthan Atomic Power Project Unit-7 (RAPP-7) in Rawatbhata. After its initial connection to the grid, the reactor underwent a series of rigorous power ascension tests. RAPP-7 is the third indigenous 700 MW Pressurised Heavy Water Reactor (PHWR) to reach full capacity under India's current expansion phase.

Why It Matters

This achievement significantly boosts India's clean baseload electricity generation and supports the nation's net-zero emission goals. It also validates the efficiency of India's 'fleet-mode' construction strategy, demonstrating advanced indigenous manufacturing and engineering capabilities in the nuclear sector.

Background

History & Context

India's atomic energy trajectory is guided by the Three-Stage Nuclear Power Programme conceptualized by Dr. Homi Bhabha in the 1950s, with the first stage relying on PHWRs fueled by natural uranium. To rapidly scale up capacity, the Union Cabinet in May 2017 approved the construction of ten 700 MW indigenous PHWRs in 'fleet mode'. RAPP-7 is part of this standardized fleet, following the successful operationalization of the first two 700 MW units at Kakrapar (KAPP-3 and KAPP-4).

What Changed

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BEFORE: India's indigenous nuclear power capacity expansion previously relied on smaller 220 MW and 540 MW PHWR designs. NOW: India is successfully operating a standardized fleet of much larger 700 MW PHWRs, maximizing power output per reactor.
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BEFORE: Nuclear reactors were historically constructed as individual projects, leading to longer procurement and construction delays. NOW: The 'fleet mode' approach allows for bulk procurement and standardized design, streamlining the commissioning of reactors like RAPP-7.
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BEFORE: RAPP-7 was operating at lower thermal power levels for mandatory safety and grid synchronization testing. NOW: The reactor has cleared all power ascension tests and is continuously operating safely at its maximum rated commercial capacity of 700 MW.

Prelims Angle

NCERT Connection

This development is a direct application of concepts from Class 12 Physics Chapter 13 (Nuclei), specifically the physics of nuclear fission and controlled chain reactions. RAPP-7 demonstrates these principles by using heavy water (Deuterium Oxide) as a moderator to thermalize (slow down) fast neutrons, which is essential to sustain the fission of natural uranium fuel.

Practice Questions

Q1

Correct Statement(s)

Which of the following statements regarding India's 700 MW Pressurised Heavy Water Reactors (PHWRs) is/are correct? 1. They use enriched uranium as fuel and light water as a moderator. 2. The 'fleet-mode' construction strategy aims to reduce costs and construction time through standardized designs.

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