Event 20
Event 20 : In the context of the reporting and analysis of events, an event is any occurrence unintended by the operator, including operating error, equipment failure or other mishap, and deliberate action on the part of others, the consequences or potential consequences of which are not negligible from the point of view of protection or safety. As with INES, the terminology related to the reporting and analysis of events is not always consistent with the terminology used in safety standards, and great care should be taken to avoid confusion. In particular, the definition of event given above is identical in essence to the safety standards definition (1) of accident. This difference derives from the fact that event reporting and analysis is concerned directly with the question of whether an event that could develop into an accident with significant consequences actually does so; terms such as accident are used only to describe the end result and therefore other terms are needed to describe the earlier stages. See: Initiating Event And Initiating Event: Postulated Initiating Event. Events (including anticipated operational occurrences) Circumstances Incidents (including initiating events, accident precursors and near misses) Scenarios: postulated incidents Situations (including operating conditions, accident conditions) Scenarios: hypothetical situations Accidents (unintentional causes) Intentional causes (unauthorized acts: malicious and nonmalicious) (e.g. sabotage, theft) E.g. acute potential exposure Operational states, design basis accident conditions Nuclear and radiological emergencies, beyond design basis accident conditions E.g. chronic potential exposure. Notes: A scenario is a postulated or assumed set of conditions and/or events. A scenario may represent the conditions at a single point in time or a single event, or a time history of conditions and/or events. Anticipated Operational Occurrences; Beyond Design Basis Accidents; Design Basis Accidents: See: Plant States. Attributes: these terms use the following attributes: acute and chronic; actual and postulated; unintentional and intentional causes; malicious and non-malicious; DBA and BDBA; nuclear and radiological. Definitions: Circumstance: A fact, occurrence or condition, especially (in plural) the time, place, manner, cause, occasion, etc., or surroundings of an act or event. (in plural) The external conditions that affect or might affect an action. Occurrence: The act or an instance of occurring, i.e. coming into being as an event or process at or during some time; happening. The act or an instance of existing or being encountered in some place or conditions. Situation: A set of circumstances; a state of affairs
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