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Definition of Anticipated transient without scram

Anticipated transient without scram Definition from Science & Technology Dictionaries & Glossaries
NRC Nuclear Energy Glossary
ATWS is one of the "worst case" accidents, consideration of which frequently motivates the NRC to take regulatory action. The accident could happen if the system that provides a highly reliable means of shutting down the reactor (scram system) fails to work during a reactor event (anticipated transient). The types of events considered are those used for designing the plant.
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).