Uranium enrichment facilities pose significant nuclear proliferation concerns:
- Dual-use technology: The same enrichment technology used to produce low-enriched uranium (LEU, 3-5%) for power reactors can, with modification, be used to produce highly enriched uranium (HEU, >20%, or weapons-grade >90%) for nuclear weapons.
- Centrifuge cascades can be relatively easily reconfigured or extended to produce higher enrichments.
- Clandestine facilities: Small centrifuge plants can be built covertly, making detection difficult.
- The International Atomic Energy Agency (IAEA) monitors declared enrichment facilities under safeguards agreements, but detecting undeclared facilities remains a major challenge.
International Enrichment Centres: Following proposals from the IAEA and Russia, there have been moves to establish international uranium enrichment centres to reduce proliferation risk. The first of these was the Angarsk International Uranium Enrichment Centre (IUEC) in Siberia, with Kazakh equity. The concept is that countries can access enrichment services without possessing the technology themselves.
Key Point for Safeguards: The enrichment step is considered the most proliferation-sensitive stage of the nuclear fuel cycle. This is why enrichment technology is subject to strict international controls, and why Iran’s enrichment programme has been such a major international concern.