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Prelims · Science & technology · 32 questions

Defence, nuclear & energy technology

Every UPSC Prelims question on this topic, 2016–2026, newest first. Tap an option to check yourself; the answer and explanation open below it.

Defence, nuclear & energy technology questions per year: 2016: 1, 2017: 1, 2018: 1, 2019: 1, 2020: 1, 2021: 0, 2022: 0, 2023: 2, 2024: 2, 2025: 2, 2026: 4 Asked in 9 of 11 years · most in 2026 (4)

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In India, why are some nuclear reactors kept under "IAEA Safeguards" while others are not?

Answer & explanation

Answer: (b) Some use imported uranium and others use domestic supplies

The dividing line is the fuel: India's reactors that run on imported fuel are under IAEA safeguards, while those fuelled by India's own (indigenous) supplies are outside them. This follows the Separation Plan, notified under India's India-specific Safeguards Agreement with the IAEA, which covers only the civilian facilities India listed.

  • ✓ (b) In a 2015 reply to the Lok Sabha, the Government said 13 reactors (Tarapur 1&2, Rajasthan 1 to 6, Kakrapar 1&2, Narora 1&2 and Kudankulam 1) are under IAEA Safeguards and use imported fuel, while the other eight, such as Kaiga 1 to 4, run on indigenous fuel.
  • ✗ (c) Ownership or operator is not the divider: Tarapur Units 1&2 are safeguarded, but Tarapur Units 3&4 at the same station, fuelled by indigenous fuel, are not.
  • ✗ (a) Official statements draw the line between imported and indigenous fuel, not between uranium and thorium.

Remember · Indian power reactors that use imported fuel (e.g. Tarapur 1&2, Kudankulam) are under IAEA safeguards; those on indigenous fuel (e.g. Kaiga, Madras, Tarapur 3&4) are not.

Sources

Question and answer: UPSC's official GS Paper I (2020, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). Permalink ·

The same topic in Mains