IEEE 765-2006 pdf download IEEE Standard for Preferred Power Supply (PPS) for Nuclear Power Generating Stations (NPGS)
1. Overview
This standard has seven clauses and two annexes. The first clause defines the scope of this standardClause 2 provides references, and Clause 3 provides definitions that are not found in other standards or areessential to the interpretation of the intent of this standard.
The general design criteria of the preferred power supply (PPS) are outlined in Clause 4, and the specificdesign criteria in Clause 5 describe the interfaces with the transmission system, switchyard, Class lE powersystem, and alternate ac (AAC) source. Clause 6 describes the surveillance and test requirements, andClause 7 describes multi-unit considerations. Annex A provides guidelines that may be used to preserve thereliability of the PPS in a deregulated environment Annex B provides guidelines for performingtransmission system studies to ensure voltage adequacy of PPS.Annex C is the bibliography.
1.1 Scope
This standard describes the desigm criteria of the PPS and its interfaces with the Class 1E power system.switchyard, transmission svstem, and AAC source. Figure 1 is a typical interface diagram of the PPS withrelated power systems.
1.2 Purpose
This standard provides PPS requirements for nuclear power generating stations (NPGSs) and guidance in theareas of AAC power source interfaces with the PPS, physical independence of the PPS power and controlcircuits, and expanded PPS criteria for multi-unit stations.
2. Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences. only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments or corrigenda) applies.
IEEE Std 308,IEEE Standard Criteria for Class 1E Power Systems for Nuclear Power GeneratingStations.l, 2
IEEE Std 741M IEEE Standard Criteria for the Protection of Class 1E Power Systems and Equipment inNuclear Power Generating Stations.
3. Definitions
For the purpose of this standard, the following terms and definitions apply. The Authoritative Dictionary of IEEE Standards Terms [B2] 3 should be referenced for terms not defined in this clause.
3.1 acceptable: Demonstrated to be adequate by the safety analyses of the station.
3.2 alternate ac (AAC) source: An alternating current (ac) power source that is available to and located at or nearby a nuclear power generating station that meets the following requirements:
a) It may be connected to the PPS or the onsite emergency ac power system.
b) It has minimum potential for common-mode failure with PPS or onsite emergency ac power sources.
c) It is available in a timely manner after the onset of a station blackout.
d) It has sufficient capacity and reliability to operate all systems required for the following:
1) Coping with a station blackout
2) The time needed to bring the plant to and maintain it in a safe shutdown condition (non-design basis accident)
IEEE 765-2006 pdf download
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