IEEE 387-1977

387-1977 is a superseded standard for generator units applied as standby power supplies for nuclear power generating stations. It addresses the technical expectations for backup generating equipment used in power, energy, and related industrial applications where dependable standby power is essential. By defining a focused framework for these generator units, 387-1977 helps support consistent engineering, procurement, and evaluation decisions for critical plant support systems.

387-1977 overview

This technical document concentrates on generator units intended to serve as standby power supplies in nuclear power generating stations. Its purpose is to guide the design, performance, and application context of equipment that may be relied on when primary power is unavailable. In practice, 387-1977 is relevant to engineers and buyers who need a common reference for comparing generator units, checking suitability for station backup duties, and aligning specifications with safety-oriented plant requirements.

Typical use cases

387-1977 is typically consulted when selecting or reviewing standby generator units for nuclear plant electrical support systems. It may apply during specification writing, equipment qualification, and design review for auxiliary power arrangements that must operate during outages or abnormal conditions. The standard is also useful for procurement teams evaluating generator sets, control interfaces, and associated components intended for critical power continuity in station service applications.

Why this standard matters

For standby power in nuclear generating stations, consistency and reliability are central concerns. 387-1977 matters because it gives stakeholders a shared technical basis for assessing whether a generator unit is suitable for its intended role. That can reduce ambiguity in contracts, improve design control, and support more disciplined testing and acceptance work. In a safety-sensitive environment, a clear standard also helps limit risk from incompatible ratings, overlooked requirements, or uneven performance expectations.

• Standby generator units for nuclear stations
• Backup power supply requirements
• Design and procurement reference
• Evaluation of critical electrical equipment
• Superseded technical standard