This figure differs from that in the 1988 versions of the NUSS Codes, as follows: Accident conditions are now taken to include all non-operational states, rather than just design basis accidents and those enveloped by them (marked a); The new category, marked b, of beyond design basis accidents which are not classified as severe accidents because there is no significant core degradation; and The term accident management is applied only to beyond design basis accidents, rather than all non-operational states. Accident Conditions: Deviations from normal operation more severe than anticipated operational occurrences, including design basis accidents and severe accidents. Examples of such deviations include a major fuel failure or a loss of coolant accident (LOCA). See: Accident. Operational states Accident conditions Within design basis, accidents, Normal operation, Design basis accidents, Severe accidents, Accident management, Anticipated operational occurrences, Beyond design basis accidents, Accident conditions that are not design basis accidents as explicitly considered but which are encompassed by them, Beyond design basis accidents without significant core degradation. Accident Management: The taking of a set of actions during the evolution of a beyond design basis accident: (a) To prevent the escalation of the event into a severe accident; (b) To mitigate the consequences of a severe accident; (c) To achieve a long term safe stable state. The second aspect of ‘accident management’ (to mitigate the consequences of a severe accident) is also termed ‘severe accident management’. Anticipated Operational Occurrence: An operational process deviating from normal operation which is expected to occur at least once during the operating lifetime of a facility but which, in view of appropriate design provisions, does not cause any significant damage to items important to safety or lead to accident conditions. Examples of anticipated operational occurrences are loss of normal electrical power and faults such as a turbine trip, malfunction of individual items of a normally running plant, failure to function of individual items of control equipment, and loss of power to the main coolant pump. Some States and organizations use the term abnormal operation (for contrast with normal operation) for this concept. Beyond Design Basis Accident: Accident conditions more severe than a design basis accident. Design Basis Accident: Accident conditions against which a facility is designed according to established design criteria, and for which the damage to the fuel and the release of radioactive material are kept within authorized limits. Normal Operation: Operation within specified operational limits and conditions. For a nuclear power plant, this includes starting, power operation, shutting down, shutdown, maintenance, testing and refuelling. Operational States: States defined under normal operation and anticipated operational occurrences. Some States and organizations use the term operating conditions (for contrast with accident conditions) for this concept. Severe Accident: Accident conditions more severe than a design basis accident and involving significant core degradation. Severe Accident Management: See: Severe Accident And Accident Management. By extension, accident management for a severe accident includes the taking of a set of actions during the evolution of the accident to mitigate degradation of the core. Within Design Basis Accident: Accident conditions not more severe than a design  basis accident