PWR meaning

PWR (pressurised water reactor) describes a type of civil nuclear power reactor commonly referenced in nuclear site licences, environmental permits, planning/EIA documentation, safety cases, procurement/contracts and nuclear liability analyses. Lawyers use the term to identify the reactor technology when advising on regulatory compliance, transactional due diligence and risk allocation. It is not generally defined in UK primary legislation or case law; rather, it is an engineering description used across legal and regulatory contexts. For statutory purposes, a PWR falls within the broader category of a “nuclear reactor” under the Nuclear Installations Act 1965 and associated regulations, regulated by the Office for Nuclear Regulation (ONR). Key features: light (ordinary) water serves as both neutron moderator and coolant; the primary coolant circuit is maintained at high pressure so that no bulk boiling occurs; heat is transferred via steam generators to a separate secondary circuit. In Great Britain, Sizewell B is a PWR operated by EDF Energy Nuclear Generation Limited (formerly British Energy). Usage of the term is consistent across England & Wales, Scotland and Northern Ireland. Ireland has no operating nuclear power stations, but the term is used descriptively in radiological protection, emergency planning and transboundary environmental assessment contexts.