SBERGs (Symptom Based Emergency
response Guidelines) are the operator’s emergency procedures that give advisory, symptom‑driven guidance to nuclear plant staff after a
beyond design basis accident in an advanced gas‑cooled reactor (AGR). They are not defined in legislation or case law; the term is used in industry practice and appears in safety cases and emergency plans assessed by the Office for Nuclear Regulation (ONR).
In practice, SBERGs supplement plant operating and severe‑accident management procedures. They steer stabilisation and mitigation actions based on observed plant conditions (for example, temperatures, pressures, coolant inventory, containment status and radiological readings) to protect workers and the public and to limit radioactive release.
For legal professionals, SBERGs are typically relevant to: nuclear site licence compliance (including emergency arrangements, training and exercises), safety case documentation, regulator engagement, incident investigation and reporting, supply‑chain contracts for emergency support, and insurance and liability risk assessments.
Usage is broadly consistent across Great Britain (England, Wales and Scotland), where AGRs operate and the ONR regulates under the Nuclear Installations Act 1965 regime. Northern Ireland and Ireland do not host AGRs; the term is usually encountered there only in cross‑border nuclear emergency planning and radiological protection contexts.