Fast Breeder meaning

In legal practice, fast breeder (or fast breeder reactor, FBR) describes a nuclear reactor that uses fast neutrons to convert uranium‑238 into plutonium‑239, typically via an initial plutonium fuel charge and a surrounding blanket of natural or depleted uranium. Unlike thermal reactors such as PWRs and BWRs, an FBR can produce more fissile material than it consumes and is associated with the plutonium‑based fuel cycle (sometimes called the plutonium economy). The term is not generally defined in UK or Irish legislation or case law; it is a descriptive technical expression used across nuclear licensing, environmental permitting, nuclear safeguards and export control documentation, as well as nuclear liability, transport and decommissioning regimes. For practitioners, key features include the fast‑neutron spectrum, reliance on a plutonium start‑up inventory, and breeding ratio considerations. These drive regulatory scrutiny of plutonium handling and storage, security and material accountancy, cooling system hazards, criticality safety, radioactive waste classification and long‑term disposal strategy. Usage and meaning are broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland. In the UK, any FBR installation would require a nuclear site licence and environmental permissions, overseen by the Office for Nuclear Regulation and the relevant environment agencies. In Ireland, where no nuclear power...