Key Facts and Data Points

  • Location: Visakhapatnam, Andhra Pradesh
  • Developing Agency: Raja Ramanna Centre for Advanced Technology (RRCAT), Indore
  • Purpose: To support India’s three‑stage nuclear power programme and harness thorium reserves via Accelerator‑Driven Systems (ADS)
  • Technology: High‑energy proton accelerator → spallation neutron source → sub‑critical reactor core
  • Thorium Reserves: India holds ~25% of global thorium reserves
  • Safety Feature: Sub‑critical core shuts down automatically if accelerator stops

Background and Context

  • Three‑Stage Nuclear Power Programme
  1. Stage‑1: Pressurised Heavy Water Reactors (PHWRs) using natural uranium
  2. Stage‑2: Fast Breeder Reactors (FBRs) producing plutonium‑239
  3. Stage‑3: Thorium‑based reactors using uranium‑233 derived from thorium
  • Accelerator‑Driven System (ADS)
  • Proton beam (GeV energies) strikes a heavy‑metal target (lead/bismuth) causing spallation and releasing a high flux of neutrons.
  • Neutrons feed a sub‑critical reactor core that cannot sustain a chain reaction on its own, ensuring inherent safety.
  • Enables thorium transmutation (Th‑232 → U‑233) and nuclear waste transmutation (burning long‑lived actinides).

Significance for India / Governance / Policy

  • Energy Security: Utilises abundant domestic thorium, reducing reliance on imported uranium.
  • Safety & Public Acceptance: Sub‑critical design eliminates risk of runaway meltdowns, addressing safety concerns.
  • Waste Management: ADS can transmute minor actinides, mitigating long‑term radiotoxicity and storage challenges.
  • Strategic Autonomy: Aligns with the Department of Atomic Energy’s vision of a self‑reliant nuclear fuel cycle.
  • Economic Impact: Development of high‑tech infrastructure in Visakhapatnam creates skilled jobs and promotes ancillary industries (cryogenics, advanced materials).

Related Constitutional / Legal Provisions

  • Atomic Energy Act, 1962 – Governs all nuclear activities, including research, development, and safety regulations.
  • Nuclear Safety Rules, 2000 – Mandates safety standards for reactors and accelerator facilities.
  • National Policy on Thorium Utilisation (2015) – Encourages R&D on thorium‑based reactors and ADS.

References for Further Study

  • India’s Three‑Stage Nuclear Power Programme (official DAE documents)
  • ADS technology papers by RRCAT and International Atomic Energy Agency (IAEA)
  • Recent UPSC prelims questions on monazite, thorium and IAEA safeguards