Reactor Protection System meaning

Reactor Protection System (RPS) describes, in nuclear safety and project documentation, the engineered system that automatically trips a nuclear reactor to a safe shutdown and keeps it shut down when required, with facilities for manual initiation. It is a technical term rather than a statutory definition, used across safety cases, procurement contracts and engineering standards. In Great Britain, the concept sits within the nuclear site licensing regime under the Nuclear Installations Act 1965 and the Office for Nuclear Regulation (ONR). Licensees must substantiate the RPS in the safety case and meet relevant licence conditions, typically including LC 14 (safety case), LC 23 (operating rules), LC 24 (operating instructions), LC 27 (safety mechanisms, devices and circuits) and LC 28 (examination, inspection, maintenance and testing). Key legal and contractual features commonly required are: independence from control systems; redundancy and diversity; fail-safe design; segregation; single-fault tolerance; periodic proof testing; and reliable means for manual trip and maintaining the shutdown state. Frequently cited standards include IEC 61513 and IEC 61226, alongside IAEA safety requirements. Usage is broadly consistent across England & Wales and Scotland. Northern Ireland and Ireland have no power reactors; the term arises mainly in advisory, cross-border regulatory, or supply-chain contexts rather than domestic...