Detailed Explanation:

Answer: Option 2 — Some use imported uranium and others use domestic supplies

India's nuclear reactors are divided into civilian and strategic facilities under the 2005 Indo-US Civil Nuclear Deal. Reactors using imported uranium are placed under IAEA safeguards to ensure peaceful use, as mandated by international agreements for nuclear fuel supply. Reactors using domestic uranium remain outside IAEA safeguards, allowing India to maintain its strategic nuclear weapons program independently.

📝 Short Notes: India's Nuclear Programme and IAEA Safeguards

• Indo-US Civil Nuclear Deal (2008): Separated India's nuclear facilities into civilian (under IAEA safeguards) and military (outside safeguards) categories, ending India's nuclear isolation despite not signing the NPT.
• IAEA Safeguards: International inspection regime to verify that nuclear materials are used only for peaceful purposes and not diverted to weapons programs.
• Separation Plan: India voluntarily placed 14 of its 22 power reactors under IAEA safeguards, while keeping 8 reactors and other facilities outside for strategic purposes.
• Imported Uranium Condition: Any reactor using imported uranium or fuel must be under IAEA safeguards as per bilateral agreements with supplier countries (USA, Russia, France, etc.).
• Domestic Uranium: Reactors using indigenous uranium from Indian mines (Jharkhand, Andhra Pradesh) remain outside safeguards, preserving India's three-stage nuclear program and weapons capability.
• Three-Stage Programme: India's unique nuclear strategy using natural uranium (Stage I), plutonium breeder reactors (Stage II), and thorium-U233 cycle (Stage III) to achieve energy security.
• Strategic Autonomy: The separation allows India to maintain its minimum credible nuclear deterrent while accessing international nuclear commerce and technology.