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Abstract: Criteria that establish protection requirements for Class 1E power systems and equipment are prescribed. The purpose of and the means for obtaining protection from electrical and mechanical damage or failures that can occur within a time period tat is shorter than that required for operator qaction are described. Testing and surveillance requirements are included. Plant physical design requirements to protect against certain events are not included.
Class 1E portions of ac and dc power systems and I&C power systems in single-unit and multiunit nuclear power generating stations are covered in this standard. The provision of criteria for the determination of Class 1E power system design features, criteria for sharing Class 1E power systems in multiunit stations, the requirements for their testing and surveillance, and the requirements for documentation of the Class 1E power system is the intent of this standard.