This standard specifies criteria for the independence that can be achieved by physical separation and electrical isolation of equipment and circuits that are redundant.
This standard is applicable to the class 1E equipment and relevant electrical equipment and circuits in nuclear power plants.
This standard is not applicable to the determination of what equipment and circuits are redundant.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 12790 Method for Identification of Documents Related to Safety Class 1E Equipment and Systems for Nuclear Power Plants
EJ/T 534-1991 The Design and Installation of Cable Systems for Class 1E Circuits in Nuclear Power Plants
EJ/T 590-1991 Criteria for Design, Installation, and Qualification of Raceway Systems for Class 1E Circuits in Nuclear Power Plants
EJ/T 705-1992 Type Test of Class 1E Electric Cables and Field Splices for Nuclear Power Plants
3 Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1 Acceptable
Demonstrated to be adequate by the safety analysis of the station.
3.2 Associated circuits
Non-Class 1E circuits that are not physically separated or are not electrically isolated from Class 1E circuits by acceptable separation distance, safety class structures, barriers, or isolation devices.
Note: Circuits include the interconnecting cabling and the connected loads.
3.3 Auxiliary supporting features
GB/T 13286-2001 The following standards are cited：
