IEEE Std 308-2020 PDF

Full title and description

IEEE Standard 308-2020 — "Standard Criteria for Class 1E Power Systems for Nuclear Power Generating Stations" provides the design, testing, surveillance, sharing, and documentation criteria for Class 1E portions of AC and DC power systems and Instrumentation & Control (I&C) power systems in single‑unit and multiunit nuclear power generating stations.

Abstract

This standard defines the principal design criteria and features that enable Class 1E power systems to meet functional requirements under applicable design‑basis events, specifies requirements for testing and surveillance, addresses criteria for sharing Class 1E systems in multiunit stations, and establishes documentation requirements for Class 1E systems. It consolidates and updates prior guidance to reflect current IEEE consensus for nuclear station Class 1E power system criteria.

General information

• Status: Active standard.
• Publication date: 2020 (published March 2020; board approval Jan 30, 2020).
• Publisher: Institute of Electrical and Electronics Engineers (IEEE).
• ICS / categories: Nuclear engineering / power systems (example ICS classification: 27.120.30).
• Edition / version: 2020 edition (308-2020).
• Number of pages: 37 pages (typical published PDF length).

Scope

The standard applies to the Class 1E portions of alternating current (AC) power systems, direct current (DC) power systems, and instrumentation & control (I&C) power systems in single‑unit and multiunit nuclear power generating stations. It does not apply to non‑Class 1E equipment such as preferred power supplies, unit generators and their generator buses, generator breakers, step‑up/auxiliary/start‑up transformers, switchyard connections, transmission lines, or the transmission network. The intent is to provide criteria for design features, multiunit sharing, testing and surveillance, and documentation of Class 1E power systems.

Key topics and requirements

• Definition and classification of Class 1E system boundaries and components.
• Design criteria to ensure required function under design‑basis events (seismic, environmental, post‑accident conditions, etc.).
• Redundancy, separation, and independence requirements for safety‑related power and I&C circuits.
• Requirements for sharing Class 1E systems in multiunit sites and criteria to prevent adverse single‑failure or common‑cause effects.
• Testing, surveillance, and periodic inspection provisions to verify continued capability and reliability.
• Documentation, recordkeeping, and configuration management requirements for Class 1E systems.
• Acceptance and qualification criteria for replacement components and equipment used in Class 1E systems.

Typical use and users

Primary users are nuclear power plant design engineers, nuclear safety engineers, licensing personnel, systems engineers, I&C designers, power system planners, plant owners/operators, and regulatory compliance staff involved in design, modification, review, or oversight of Class 1E power and I&C systems. The standard is used during design, licensing submittals, procurement specifications, plant modifications, periodic testing programs, and safety analyses.

Related standards

IEEE 308-2020 updates and supersedes earlier editions of IEEE 308 (for example 308-2012). Other related IEEE and industry standards cover complementary topics such as electrical qualification, testing methods, environmental qualification, and nuclear plant instrumentation and control; project‑level or regulatory guidance documents may be referenced for licensing‑specific requirements. A new IEEE project (P308) has been recorded to continue development/revision work that will supersede or revise 308-2020 in the future.

Keywords

Class 1E, nuclear power, power systems, I&C power, safety‑related electrical systems, redundancy, separation, testing, surveillance, documentation, multiunit sharing.

FAQ

Q: What is this standard?

A: IEEE Std 308-2020 is the IEEE consensus standard titled "Standard Criteria for Class 1E Power Systems for Nuclear Power Generating Stations," which establishes design, testing, surveillance, sharing, and documentation criteria for Class 1E portions of AC/DC and I&C power systems in nuclear power plants.

Q: What does it cover?

A: It covers the principal design criteria and features necessary for Class 1E systems to perform under applicable design‑basis events, requirements for testing and surveillance, criteria for sharing systems at multiunit sites, and required system documentation and records.

Q: Who typically uses it?

A: Nuclear plant designers, systems and I&C engineers, licensing and regulatory staff, plant operators, test engineers, and procurement/specification writers use this standard when designing, evaluating, modifying, or maintaining Class 1E power systems.

Q: Is it current or superseded?

A: As published in 2020, IEEE 308-2020 is the current IEEE edition of this standard (it superseded earlier editions such as 308-2012). Work to revise or update the standard continues under IEEE project activities.

Q: Is it part of a series?

A: IEEE 308 is part of the family of IEEE standards addressing electrical and instrumentation requirements for nuclear power plants; designers commonly cross‑reference related IEEE standards and industry/regulatory documents that address environmental qualification, testing methods, and other safety‑related electrical topics.

Q: What are the key keywords?

A: Key keywords include: Class 1E, nuclear power, safety‑related power, I&C power, redundancy, separation, testing, surveillance, multiunit sharing, documentation.