IEEE Std 384:2018 pdf download.IEEE Standard Criteria for Independence of Class 1E Equipment and Circuits.
IEEE Std 384 describes the independence requirements of the circuits and equipment comprising or associated with Class iF systems. It sets forth criteria for the independence that can be achieved by physical separation and electrical isolation of redundant circuits and equipment that are redundant, but does not address the determination of what is to be considered redundant.
1.2 Purpose
This standard establishes the criteria for implementation of the independence requirements of IEEE Std 308TM and IEEE Std 603T:
2. Normative references
The following relrenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
ANSI/ANS 58.2, Design Basis for Protection of Light Water Nuclear Power Plants Against the Effects of Postulated Pipe Rupture.
ANSI/NFPA 30, Flammable and Combustible Liquids Code.
ANSI/NFPA 803, Standard for Fire Protection for Light Water Nuclear Power Plants.
ASTM E84, Standard Test Method for Surface Burning Characteristics of Building Materials.t
ASTM E11 9, Standard Test Methods for Fire Tests of Building Construction and Materials.
ASTM E136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 °C.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause.
acceptable: Demonstrated to be adequate by the safety analysis of the station.
associated circuits: Non-Class 1 E circuits that are not physically separated or are not electrically isolated from Class I E circuits by acceptable separation distance, safety class structures, barriers, or isolation devices. Circuits include the interconnecting cabling and the connected loads.
auxiliary supporting features: Systems or components that provide services (such as cooling, lubrication. and energy supply) that are required for the safety system to accomplish its safety functions.
barrier: A device or structure interposed between redundant Class I E equipment or circuits, or between Class 1 E equipment or circuits and a potential source of’ damage. to limit damage to Class I E systems to an acceptable level.
beyond-design-basis external event (BDBEE): Event initiated by natural phenomena that either exceeds the protections provided by design basis features or involves natural phenomena within the design basis in combination with beyond-design-basis failures leading to an extended loss of ac power and/or loss of ultimate heat sink.
cable in free air: That portion of a cable not routed in either a raceway or an enclosure.
Class 1 E: The safety classification of the electric equipment and systems that are essential to emergency reactor shutdown, containment isolation, reactor core cooling, and containment and reactor heat removal, or are otherwise essential in preventing a significant release of radioactive material to the environment.IEEE Std 384 pdf download.